Abstract

This injection molding method uses an injection molding machine for two-material molding, which comprises a first mold part that is provided with a cavity and a second mold part that is provided with a cavity and is arranged in tandem with the first mold part. This injection molding method comprises: a first molding step wherein a material is injected into the cavity of the first mold part and the material in the cavity is compressed; and a second molding step wherein a material is injected into the cavity of the second mold part. A pressure, which is generated in the second mold part by injecting the material into the cavity in the second molding step, acts on the first mold part, and a compressive force is applied to the material in the cavity in the first molding step.

IPC Classes  ?

• B29C 45/16 - Making multilayered or multicoloured articles
• B29C 45/70 - Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices
• B29C 45/64 - Mould opening, closing or clamping devices
• B29C 45/76 - Measuring, controlling or regulating
• B29C 45/26 - Moulds

Abstract

Provided is a screw for an injection molding apparatus, the screw enabling the elimination of the uneven distribution of an added component, without imparting an excessive shear force to the added component. In the present invention, the following are provided: a plasticization step in which resin pellets P and an added component are supplied to a heating cylinder 201 that is provided with a screw 10 which can rotate about a rotation axis C and which can advance and retract along the rotation axis C, and a molten resin M is generated by causing the screw 10 to rotate normally; and an injection step in which the molten resin M which contains the added component is ejected towards a cavity. In the plasticization step, at a prescribed speed, and only at a prescribed stroke D1 or for only a prescribed time, a retraction operation is carried out for causing the screw 10 to be forcibly retracted.

IPC Classes  ?

• B29C 45/50 - Axially movable screw
• B29C 45/76 - Measuring, controlling or regulating

Abstract

An injection foam molding machine of the invention includes: a movable mold platen; a fixed mold platen; a mold fastening hydraulic cylinder that is provided at each of four corners of both mold platens; a tie bar that is driven by the hydraulic cylinder to fasten the molds; two sets of mold opening and closing actuators that drive the movable mold platen to move close to or away from the fixed mold platen; two sets of dedicated core back devices; and a control device that controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices, wherein the control device includes a dedicated core back program that simultaneously controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices during a foaming core back operation of moving the movable mold platen away from the fixed mold platen.

IPC Classes  ?

• B29C 45/17 - Component parts, details or accessoriesAuxiliary operations
• B29C 45/76 - Measuring, controlling or regulating
• B29C 45/66 - Mould opening, closing or clamping devices mechanical
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 45/80 - Measuring, controlling or regulating of relative position of mould parts
• B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
• B29C 45/37 - Mould cavity walls
• B29C 45/68 - Mould opening, closing or clamping devices hydro-mechanical
• B29K 105/04 - Condition, form or state of moulded material cellular or porous

Abstract

Provided is a screw for an injection molding machine that can solve the uneven distribution of reinforcing fibers without applying excessive shear forces on the reinforcing fibers. A screw (10), to which resin pellets (P) are supplied at the upstream end in the resin conveyance direction and reinforcing fibers (F) are supplied at the downstream end and which is provided inside a heating cylinder (201) of an injection molding machine (1), is equipped with: a first stage (21) for melting the supplied resin pellets (P); and a second stage (22) continuing from the first stage (21) for mixing the melted resin (M) with the reinforcing fibers (F). A second scraper (28) that is provided in the second stage is provided with a large diameter scraper (28A) with a relatively large outer diameter and a small diameter scraper (28B) with a relatively small outer diameter.

IPC Classes  ?

• B29C 45/47 - Means for plasticising or homogenising the moulding material or forcing it into the mould using screws

Abstract

This injection molding method uses an injection molding machine for two-material molding (10), which comprises a first mold part (1B) that is provided with a cavity (C2) and a second mold part (1A) that is provided with a cavity (C1) and is arranged in tandem with the first mold part (1B). This injection molding method comprises: a first molding step wherein a material (P2) is injected into the cavity (C2) of the first mold part (1B) and the material (P2) in the cavity (C2) is compressed; and a second molding step wherein a material (P1) is injected into the cavity (C1) of the second mold part (1A). By having the pressure to the second mold part (1A), said pressure being generated by injecting the material (P1) into the cavity (C1) in the second molding step, act on the first mold part (1B), a compressive force is applied to the material (P2) in the cavity (C2) in the first molding step.

IPC Classes  ?

• B29C 45/70 - Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices
• B29C 45/16 - Making multilayered or multicoloured articles
• B29C 45/32 - Moulds having several axially spaced mould cavities

Abstract

Provided is an injection molding method that can resolve uneven reinforcing fiber distribution without applying an excessive shearing force on the reinforcing fibers. In the injection molding method for fiber-reinforced resin according to the present invention: a resin-accumulating area is provided on the downstream side of the injection completion position inside a heating cylinder (201); in the injection step of a preceding cycle, an injection pressure is applied on molten resin (Mr) occupying the resin-accumulating area; and in the plasticizing step of the following cycle, a shearing force is applied on the molten resin (Mr) that is occupying the resin-accumulating area. Applying a high injection pressure on the molten resin (Mr) occupying the resin-accumulating area impregnates molten resin (Mr) into clumped reinforcing fibers (F). Subsequently applying a shearing force in the plasticizing step of the following cycle promotes dispersion of the reinforcing fibers (F).

IPC Classes  ?

• B29C 45/47 - Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
• B29B 7/90 - Fillers or reinforcements

Abstract

A mold-clamping device includes a fixed mold plate including a fixed mold; a movable mold plate including a movable mold; a hydraulic cylinder allowing the movable mold plate to approach or be separated from the fixed mold plate; a hydraulic pressure supply source supplying a hydraulic fluid to the hydraulic cylinder; and a control unit performing driving control on the hydraulic pressure supply source. The control unit includes a flow rate decrease control unit for deceleration for decreasing a flow rate of the hydraulic fluid according to a deceleration gradient set in advance when a movement of the movable mold plate is decelerated according to the deceleration gradient, and a flow rate increase control unit for controlling the flow rate of the hydraulic fluid to increase when the flow rate of the hydraulic fluid is decreased according to the deceleration gradient by the flow rate decrease control unit.

IPC Classes  ?

• B29C 45/76 - Measuring, controlling or regulating
• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 33/24 - Opening, closing or clamping by rectilinear movement using hydraulic or pneumatic means

Abstract

The objective of the present invention is to provide a compact motor that can be achieved at a low cost and that generates a high torque without the occurrence of demagnetization. The motor is characterized by being provided with: a stator that generates a rotating magnetic field; a rotor supported rotatably by a shaft within the stator; an outermost peripheral permanent magnet (5a) that is a permanent magnet embedded inside the rotor in an arced shape forming a convexity at the inner surface of the rotor; and an inner permanent magnet (5b, 5c) that is a permanent magnet embedded at the inside of the rotor in parallel to the outermost peripheral permanent magnet (5a). The motor is further characterized in that the arc angle of the permanent magnets (5a, 5b, 5c) is greater than 90°C, the thickness at the center of both inner permanent magnets (5b, 5c) is thinner than the thickness at the center of the outermost peripheral permanent magnet (5a), and the thickness at the ends of both inner permanent magnets (5b, 5c) is thicker than the thickness at the ends of the outermost peripheral permanent magnet (5a).

IPC Classes  ?

• H02K 1/27 - Rotor cores with permanent magnets

Abstract

A mold clamping device includes a fixed platen on which a fixed mold is disposed, a movable platen on which a movable mold that defines a cavity along with the fixed mold is disposed, a tie bar configured to resist a mold clamping force that is generated between the fixed platen and the movable platen, and a half nut opening and closing device configured to grip the tie bar, thereby locking the movable platen and the tie bar, in which the half nut opening and closing device includes half nuts configured to grip the tie bars, an actuator which is disposed on the movable platen and configured to move the half nuts back and forth with respect to the tie bars, and a clevis configured to connect the actuator to the half nuts so as to allow the actuator to swing with respect to the gripping member.

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices
• B29C 45/68 - Mould opening, closing or clamping devices hydro-mechanical
• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic

Abstract

Provided is a control device for an injection molding machine, capable of reducing the load on a worker when re-displaying a previously displayed screen. The control device (20) for the injection molding machine (1) controls the display of display images on a display unit (29). This control device (20) divides the display unit (29) into a first display area (31) and a second display area (32) and, if an instruction to scroll in the vertical direction is received when a first display image (P1) is displayed in the first display area (31) and a second display image (P2) is displayed in the second display area (32), synchronously scrolls the first display image (P1) and the second display image (P2) whilst maintaining the relative positions of the first display image (P1) and the second display image (P2).

IPC Classes  ?

• B29C 45/76 - Measuring, controlling or regulating
• B22D 17/32 - Controlling equipment

Abstract

Provided is a control device for an injection molding machine, capable of reducing the load on a user, in relation to display image selection.　The control device for the injection molding machine comprises: a display unit that displays display images including information relating to molding conditions for the injection molding machine; display image selection buttons that directly summon display images and displays same on the display unit; and a storage unit that stores a plurality of desired display image selection buttons, as customizable menu display items.

IPC Classes  ?

• B29C 45/76 - Measuring, controlling or regulating
• B22D 17/32 - Controlling equipment

Abstract

Provided are an injection molding apparatus and an injection molding method for reinforcing fiber-containing resin material with which stable molding quality is obtained by preventing or limiting variations in the reinforcing fiber content. This injection molding apparatus is provided with: a heating cylinder (201); a screw (10) provided inside the heating cylinder (201) so as to be rotatable; a resin supply hopper (207) for supplying resin pellets (P); and a fiber supply device (213) provided in front of the resin supply hopper (207) for supplying reinforcing fiber into the heating cylinder (201). The screw (10) is provided with: a first stage (21) located in back for melting the resin pellets (P); and a second stage (22) located in front for mixing the melted resin pellets (P) with the reinforcing fibers (F). The lead (L2) of a second flight (28) provided in the second stage (22) is larger than the lead (L1) of a first flight (27) provided in the first stage (21).

IPC Classes  ?

• B29C 45/60 - Screws
• B29C 45/18 - Feeding the material into the injection moulding apparatus
• B29K 105/12 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Abstract

Provided is an injection molding method for a resin material with which a stable reinforcing fiber content can be obtained. This injection molding method, which is provided with a heating cylinder (201) on the front end of which a discharge nozzle (203) is formed, a single axis screw (10) provided so as to be rotatable inside the heating cylinder (201), and a fiber-supplying device (213) for filling reinforcing fiber (F) into the heating cylinder (201), and which performs injection molding while supplying the reinforcing fiber (F) and the resin starting material separately and supplying the reinforcing fiber (F) on the front side of the resin starting material. The method is characterized in that: the method is provided with a plasticization process for obtaining a specified amount of a kneaded product by retracting the screw (10) while rotating in the normal direction to melt the resin starting material and knead reinforcing fiber (F) into the melted resin starting material, and an injection process for discharging the kneaded product from the discharge nozzle (203) by advancing the screw (10); and reinforcing fiber (F) is supplied into the heating cylinder (201) in the injection process.

IPC Classes  ?

• B29C 45/18 - Feeding the material into the injection moulding apparatus
• B29C 45/50 - Axially movable screw
• B29C 45/76 - Measuring, controlling or regulating
• B29K 105/12 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Abstract

The hydraulic source control device includes an operation input device capable of inputting operation conditions regarding the driving force of a fluid pressure control element, a servo motor including a motor section that drives a hydraulic pump and an amplifier that drives the motor section, and a controller that outputs a control command to the servo motor based on an input result to the operation input device. The controller obtains the fluid pressure of a working fluid based on the operation conditions regarding the input driving force, computes the output torque of the motor section based on the relationship between the fluid pressure and the output torque that are stored in advance, and outputs the computed output torque to the amplifier as a control command of the torque limitation value of the servo motor.

IPC Classes  ?

• F01B 25/00 - Regulating, controlling or safety means
• B29C 45/82 - Hydraulic circuits

Abstract

This mold-clamping device is provided with a fixed mold platen, a movable mold platen, and a mold-opening and -closing cylinder for moving the movable mold platen near to or away from the fixed mold platen, as well as a hydraulic pressure supply source for supplying hydraulic fluid to the mold-opening and -closing cylinder, and a control unit for driving and controlling the hydraulic supply source. The control unit is provided with: a flow rate reduction control unit during speed reduction for decreasing the flow rate of hydraulic fluid in accordance with a speed-reduction gradient set in advance when the movement speed of the movable mold platen is reduced in accordance with the speed-reduction gradient set in advance; and a flow rate increase control unit capable of performing control so as to increase the flow rate of the hydraulic fluid when the flow rate of the hydraulic fluid is being decreased in accordance with the speed-reduction gradient set in advance by the control unit.

IPC Classes  ?

• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B29C 33/24 - Opening, closing or clamping by rectilinear movement using hydraulic or pneumatic means

Abstract

A hydraulic supply device of an injection molding machine is provided with: a first main hydraulic power source including a first main hydraulic pump having a variable capacity and driven by a first constant rotational speed motor, and a first main discharge pipe through which working oil flows; an auxiliary hydraulic power source including an auxiliary hydraulic pump driven by a servo motor and operated at a specific capacity, an auxiliary discharge pipe through which the working oil flows, and a check valve that regulates the inflow of working oil to the auxiliary hydraulic pump; a hydraulic control unit that controls the first main hydraulic power source and the auxiliary hydraulic power source; a junction pipe at which the first main discharge pipe and the auxiliary discharge pipe join; and a switching unit that switches the supply/non-supply of working oil for a hydraulic actuator.

IPC Classes  ?

• B29C 45/18 - Feeding the material into the injection moulding apparatus
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 45/76 - Measuring, controlling or regulating
• B29C 45/82 - Hydraulic circuits

Abstract

A hydraulic oil storage device and an injection molding device are provided with a connection box that partitions a storage region of a sub-tank into a first region that includes a flow channel opening portion for a coupling tube and a second region other than the first region, in which the connection box is provided with an internal region communication portion that brings the first region and the second region into communication, and causes a pressure loss equal to the pressure loss of the coupling tube, or a pressure loss greater than that pressure loss, and a return tube is connected to the sub-tank so that the flow channel outlet faces the first region.

IPC Classes  ?

• F15B 1/26 - Supply reservoir or sump assemblies
• B29C 45/03 - Injection moulding apparatus
• B65D 25/00 - Details of other kinds or types of rigid or semi-rigid containers

Abstract

A plasticizing screw for injection molding according to the present invention is a plasticizing screw for injection molding that is installed in an injection molding machine which performs injection molding by plasticizing granular thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a flight, and a mixer. The mixer is provided in plural stages in an axial direction, and the number of fins of the mixer of each stage increases toward a leading end side in the axial direction from a rear end side in the axial direction. Further, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.

IPC Classes  ?

• B29C 45/47 - Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
• B29C 45/17 - Component parts, details or accessoriesAuxiliary operations
• B29C 45/60 - Screws
• B29K 105/12 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Abstract

This mold clamping device is provided with a fixed platen where a fixed mold is arranged, a movable platen where a movable mold which defines a cavity in conjunction with the fixed mold is arranged and which is movable relative to the fixed platen, a tie bar which resists the mold clamping force generated between the fixed platen and the movable platen, and a half nut opening/closing device (20) which holds the tie bar and engages the movable platen and the tie bar. This mold clamping device is characterized in that the half nut opening/closing device (20) is provided with half nuts (21, 22) which hold the tie bar, an actuator (30) which is arranged on the movable platen and which advances and retracts the half nuts (21, 22) relative to the tie bar, and a clevis (32) which swingably connects the actuator (30) and the half nuts (21, 22). This mold clamping device makes it possible to suppress bending damage to the rod (31) of the actuator (30).

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices
• B22D 17/26 - Mechanisms or devices for locking or opening dies

Abstract

Breakage of the actuator moving the movable platen in the clamping device of an injection molder is prevented. The clamping device includes a movable platen shifting device increasing and decreasing a horizontal distance between the movable platen (3) and the fixed platen (2). It includes an actuator (41), a clevis pin connecting the actuator (41) and the movable platen (3), a clevis pin holding part holding a central axis of the clevis pin perpendicular to a moving direction of the movable platen (3), and a clevis pin connecting part that connects the actuator (41) and the clevis pin. The clevis pin connecting part is a supporting structure rotating with the clevis pin. The clevis pin connecting part is supported by the movable platen (3). The clevis pin, the clevis pin connecting part, and the front end of the actuator are aligned in a straight line.

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices

Abstract

A plasticizing screw for injection molding according to the present invention is installed in an injection molding machine that performs injection molding by plasticizing thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a main flight, and a sub-flight. The protrusion height of the main flight from the circumferential surface of the shaft is formed to be constant in at least an area in which the sub-flight is provided. The sub-flight includes a flat surface portion which is provided on the rear end side in a winding direction and in which a protrusion height from the circumferential surface of the shaft is lower than that of the main flight and is constant, and an inclined surface portion which is provided to extend continuously from a leading end in the winding direction of the flat surface portion and in which a protrusion height from the circumferential surface of the shaft gradually increases toward the leading end side in the winding direction and is less than the protrusion height of the main flight.

IPC Classes  ?

• B29C 45/60 - Screws
• B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
• B29C 45/47 - Means for plasticising or homogenising the moulding material or forcing it into the mould using screws

Abstract

The injection molding method for injecting a resin into a cavity formed within a mold is provided with a heating step in which the temperature of a cavity surface forming the cavity of the mold is heated to a temperature equal to or higher than a heat distortion temperature of the resin and an injection step in which after the heating step, during a decrease in temperature of the cavity surface of the mold, the resin is injected into the cavity.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould

Abstract

A hydraulic supply device of an injection molding machine is provided with: a first main hydraulic power source comprising a first main hydraulic pump having a variable capacity and driven by a first motor with a constant rotational speed, and a first main discharge pipe through which operation oil flows; a sub hydraulic pump driven by a servo motor and operated at a specific capacity; a sub hydraulic power source comprising a sub discharge pipe through which the operation oil flows, and a backflow valve for regulating the inflow of operation oil to the sub hydraulic pump; a hydraulic control unit for controlling the first main hydraulic power source and the sub hydraulic power source; a junction pipe at which the first main discharge pipe and the sub discharge pipe converge; and a switching unit for switching between the supply/non-supply of operation oil for a hydraulic actuator.

IPC Classes  ?

• B29C 45/82 - Hydraulic circuits
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic

Abstract

The injection molding device of the present invention is provided with a supply pipe which supplies a heat medium to a mold, a discharge pipe which discharges the heat medium from the mold, a mold temperature adjustor to which the supply pipe and the discharge pipe are connected to adjust the temperature of the mold, and a discharge rate adjusting unit which is provided with a variable flow control valve installed on the discharge pipe to adjust a flow rate of the heat medium, a discharge pipe variable flow control valve bypass pipe for bypassing the variable flow control valve and a discharge pipe bypass on-off valve installed on the bypass pipe to change a flow rate of the heat medium and which is installed at a position upstream from the mold temperature adjustor on the discharge pipe.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

The resin injection molding method of the present invention is a method for molding resins inside a cavity formed within a mold. The method comprises injecting resins into the cavity through a plurality of paths installed so as to be openable and closable and optionally maintaining the resin inside the cavity at a pressure; closing each of the plurality of paths such that the resins injected from each path converge, there being a time difference between when a first path and a second path of the plurality of paths are closed; and solidifying at least the resin which is injected from the path closed earliest with a crystallinity greater than or equal to a predetermined crystallinity degree.

IPC Classes  ?

• B29C 45/46 - Means for plasticising or homogenising the moulding material or forcing it into the mould
• B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor

Abstract

The present invention prevents breakage of a moving actuator of a movable die board in a die clamping device for an injection molding machine. A die clamping device is provided with a movable die board moving means for bringing a movable die board (3) close to/away from a stationary die board (2) in the horizontal direction, the movable die board moving means comprising: an actuator (41) for moving/driving the movable die board (3); a clevis pin for connecting a tip end of an actuation rod (42) of the actuator (41) with the movable die board (3); a clevis pin fixing member for supporting the central shaft of the clevis pin in the direction perpendicular to the moving direction of the movable die board (3) and fixing the clevis pin to the movable die board (3); and a clevis pin connection member for connecting the actuator (41) and the clevis pin. The clevis pin connection member has a support structure rotatable by the clevis pin and is supported by the movable die board (3) via the clevis pin fixing member, and the clevis pin, the clevis pin connection member, and the tip end portion of the actuator are arranged in series.

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices

Abstract

The present invention relates to a resin molded product for a vehicle structural member or an aircraft structural member, wherein the molded product is formed by injection molding a thermoplastic resin raw material containing reinforced fibers using a screw provided at the tip portion thereof with a mixture projecting in the diameter direction. The injection molded product contains at least 20% by weight reinforced fibers, and the weight-average fiber length of the reinforced fibers is 1 mm to 3 mm inclusive in an evaluation area having a fixed size.

IPC Classes  ?

• B29C 45/48 - Plasticising screw and injection screw
• B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
• B64C 1/00 - FuselagesConstructional features common to fuselages, wings, stabilising surfaces or the like

Abstract

This plasticizing screw for injection molding is provided with a shaft, a main flight, and a sub-flight, and is installed in an injection molding machine that performs injection molding by plasticizing a thermoplastic resin starting material containing reinforcing fibers. The protrusion height of the main flight from the shaft peripheral surface is formed in a fixed manner at least at the region at which the sub-flight is provided. The sub-flight is provided with: a flat-surface section that is provided to the back-end side in the direction of winding and that has a protrusion height from the shaft peripheral surface that is fixed and lower than that of the main flight; and a tilted-surface section that is provided in a manner so as to extend continuously from the front end in the direction of winding of the flat-surface section, and that has a protrusion height from the shaft peripheral surface that gradually increases in the direction towards the front-end side in the direction of winding within a range that is lower than the main flight.

IPC Classes  ?

• B29C 45/47 - Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
• B29C 45/60 - Screws
• B29K 105/12 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Abstract

This plasticizing screw for injection molding is provided with a shaft, a flight, and a mixer, and is installed in an injection molding machine that performs injection molding by plasticizing a thermoplastic resin starting material in granular form containing reinforcing fibers. A plurality of steps of mixer are provided in the axial direction, and the number of fins that each step of mixer has increases from the back-end side in the axial direction towards the tip-end side in the axial direction. Also, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.

IPC Classes  ?

• B29C 45/60 - Screws

Abstract

An injection foam molding machine of the invention includes: a movable mold platen; a fixed mold platen; a mold fastening hydraulic cylinder that is provided at each of four corners of both mold platens; a tie bar that is driven by the hydraulic cylinder to fasten the molds; two sets of mold opening and closing actuators that drive the movable mold platen to move close to or away from the fixed mold platen; two sets of dedicated core back devices; and a control device that controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices, wherein the control device includes a dedicated core back program that simultaneously controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices during a foaming core back operation of moving the movable mold platen away from the fixed mold platen.

IPC Classes  ?

• B29C 44/02 - Shaping by internal pressure generated in the material, e.g. swelling or foaming for articles of definite length, i.e. discrete articles
• B29C 45/64 - Mould opening, closing or clamping devices
• B29C 45/80 - Measuring, controlling or regulating of relative position of mould parts
• B29C 45/66 - Mould opening, closing or clamping devices mechanical
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 45/68 - Mould opening, closing or clamping devices hydro-mechanical
• B29K 105/04 - Condition, form or state of moulded material cellular or porous

Abstract

Disclosed is an injection molding device provided with: a supply pipe that supplies a heat medium to a die; a discharge pipe that discharges the heat medium from the die; a die temperature regulator that adjusts the die temperature and to which the supply pipe and the discharge pipe are connected; and a discharge flow adjustment unit provided at a position on the upstream side of the die temperature regulator on the discharge pipe. The discharge flow adjustment unit comprises has a variable restrictor provided on the discharge pipe and which adjusts the flow volume of the heat medium, a discharge pipe variable restrictor bypass pipe which bypasses the variable restrictor, and a discharge pipe bypass open-close valve which changes the flow of the heat medium and is provided on the bypass pipe.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature
• B29C 45/82 - Hydraulic circuits

Abstract

The disclosed injection molding method of resin is an injection molding method of resin in which, into a cavity, after either resin being injected or the resin being injected and held at pressure from a plurality of paths, the resin is molded by closing each of the paths; wherein among a pair of the paths in which the injected resin is mutually merged, a difference is imparted to the timing of closing one of the paths and the timing of closing the other path, and at least the resin that has been injected from the path that is closed at the earlier timing is caused to solidify at a predetermined crystallinity or greater.

IPC Classes  ?

• B29C 45/22 - Multiple nozzle systems
• B29C 45/76 - Measuring, controlling or regulating

Abstract

The disclosed method for manufacturing a fiber-reinforced composite material is characterized by comprising: a step (a) in which a nonwoven cloth (N) comprising reinforcing fibers is placed inside a movable mold (12); and a step (b) in which the movable mold (12) is moved towards a fixed mold (11), closing the mold, and then a thermoplastic resin is injected inside the mold, yielding a molded object comprising the nonwoven cloth (N) and the thermoplastic resin. The mechanical strength of the resulting fiber-reinforced composite material can be improved by using injection compression molding as the injection molding in step (b).

IPC Classes  ?

• B29C 45/14 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
• B29C 45/26 - Moulds
• B29C 45/56 - Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
• B29K 105/04 - Condition, form or state of moulded material cellular or porous
• B29K 105/20 - Inserts
• B29K 309/04 - CarbidesNitrides
• B29K 309/08 - Glass

Abstract

An injection molding method for injecting a resin into the cavity (2) formed within a mold (3). The method comprises: a heating step for heating the cavity surface (12a) of the mold (3), said cavity surface (12a) forming the cavity (2), to a temperature higher than or equal to the temperature at which the resin is thermally deformed; and an injection step for injecting, after the heating step, the resin into the cavity (2) in the process in which the temperature of the cavity surface (12a) of the mold (3) decreases.

IPC Classes  ?

• B29C 45/78 - Measuring, controlling or regulating of temperature
• B29C 45/73 - Heating or cooling of the mould
• B29C 45/76 - Measuring, controlling or regulating

Abstract

An injection molding device is provided with a mold, an injection unit equipped with an injection screw that is displaceably configured such that a molten resin is filled into a cavity by forward movement to perform plural injection operations including at least a filling operation and a pressure keeping operation by displacing the injection screw, a position sensor for detecting the position of the injection screw, a temperature sensor capable of measuring the temperature of the vicinity of the cavity of the mold, a temperature adjustment unit capable of adjusting the temperature of the mold by heating or cooling the mold, a control unit for controlling the displacement of the injection screw and the temperature of the mold and determining plural switching timings of the injection operations on the basis of the position of the screw, and a display unit for displaying an image. The control unit creates a temperature waveform of the vicinity of the cavity based on an input from the temperature sensor and displays a first correlation diagram showing the correlation between the temperature waveform and a predetermined variation corresponding to the change of the temperature waveform and showing at least part of the determined plural switching timings of the injection operations on the display unit.

IPC Classes  ?

• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

A molding method provided with a primary injection molding step for molding a transparent resin in a first mold (6B), and also with a secondary injection molding step for molding a foamable resin between the molded transparent resin and a second mold (4).

IPC Classes  ?

• B29C 45/16 - Making multilayered or multicoloured articles
• B29C 45/72 - Heating or cooling
• B29K 105/04 - Condition, form or state of moulded material cellular or porous

Abstract

Provided is an injection molding machine for two-material molding which heats metal molds efficiently, prevents interference between metal molds when the molds are closed, and effectively prevents overshooting of the cavity temperature. The injection molding machine for two-material molding has two sets of a first injection unit and a second injection unit for plasticizing and injection filling different resin materials respectively. Heating of the metal molds starts while a rotary die plate is not yet completely rotated by 180 degrees, before injection molding is carried out at the first injection unit side of a secondary side but after injection molding is carried out at the second injection unit side of a primary side. In addition, after the start of heating but before the rotary die plate is not yet completely rotated by 180 degrees, i.e. before the molds are closed, the temperature of the metal molds is maintained within a temperature range which is set higher than the temperature of the metal molds at the start of heating but lower than the temperature of the metal molds during injection molding.

IPC Classes  ?

• B29C 45/10 - Injection moulding apparatus using moulds or injection units usable in different arrangements or combinations to each other
• B29C 45/16 - Making multilayered or multicoloured articles
• B29C 45/73 - Heating or cooling of the mould

Abstract

In a mold temperature control circuit of an injection molding device, such a molding cycle is repeated that, prior to injection of a resin, a heating-use medium is returned to molds and heated to a temperature suitable for resin injection, after injection of the resin, the heating-use medium is switched to a cooling-use medium, thereby the cooling-use medium is returned to the molds and cooling is conducted to give a temperature equal to or lower than a temperature at which the resin is solidified. In the mold temperature control circuit of the injection molding device, a junction piping is able to commonly use the respective supply pipings of the heating-use medium, the cooling-use medium and the scavenging compressed air to the molds and the respective discharge pipings thereof, and there is provided mold bypass piping coupling the supply-side junction piping of the heating medium with the discharge-side junction piping, a mold bypass on-off valve, a passed heating medium sensor, a mold-temperature adjusting control device which stores a mold temperature determination program and a passed heating medium determination program.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould

Abstract

A foam injection molding machine is equipped with a movable platen, a fixed platen, mold clamping hydraulic cylinders provided at four corners of both platens, a tie bar which is driven for mold clamping by the hydraulic cylinder, two sets of die opening/closing actuators which drive the movable platen to advance toward the fixed platen or retract therefrom, two sets of devices dedicated to core back, and a controller which controls the two sets of die opening/closing actuators and two sets of devices dedicated to core back, wherein the controller is provided with a program dedicated to core back and controlling operation of the two sets of die opening/closing actuators and the two sets of devices dedicated to core back simultaneously in conjunction at the time of foaming core back operation for separating the movable platen from the fixed platen.

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices
• B29C 45/70 - Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices
• B29C 45/80 - Measuring, controlling or regulating of relative position of mould parts
• B29K 105/04 - Condition, form or state of moulded material cellular or porous

Abstract

Disclosed is an injection molding method capable of preventing impressions from flow-merging sections from remaining as external appearance defects when a crystalline resin is injection molded in a mold having multiple gates. With a mold (10) heated to at least 100°C below the melting temperature of a crystalline resin (20), the crystalline resin (20) which contains spherical bodies is injected into and fills a cavity (12) of the mold (10) via multiple gates (14). Then, the mold (10) is cooled, hardening the crystalline resin (20) within the cavity (12).

IPC Classes  ?

• B29C 45/78 - Measuring, controlling or regulating of temperature
• B29C 45/73 - Heating or cooling of the mould

Abstract

An injection molding machine is provided with a mold forming a cavity into which a resin is injected, a liquid supplying device which supplies a liquid continuously to an internal flow channel of the mold during a preparation period prior to injection of the resin and an injection period in which the resin after the preparation period is injected, an electricity supplying device which supplies electricity to an electric heater arranged on the mold at least during a part of the preparation period, thereby heating the mold, and a controller which carries out a predetermined procedure for making different a temperature of a liquid in the internal flow channel between the preparation period and the injection period.

IPC Classes  ?

• B29C 45/12 - Injection moulding apparatus using two or more fixed moulds, e.g. in tandem
• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

In an injection molding machine for two-material molding including two sets of injection units 11, 12 that plasticize different resin materials and injection-fill the materials, a mold clamping unit is a hydraulic mold clamping unit that mold-clamps three sets of die plates 2, 3, 9 simultaneously, a movable die plate opening and closing unit 14 is a movable die plate opening and closing unit driven by an electric motor, a rotational die plate opening and closing unit 15 is a rotational die plate opening and closing unit 14 driven by an electric motor, and a rotating unit for the rotational die plate 9 is a rotation driving unit driven by an electric motor attached to a reversal pedestal 7.

IPC Classes  ?

• B29C 45/10 - Injection moulding apparatus using moulds or injection units usable in different arrangements or combinations to each other
• B29C 45/32 - Moulds having several axially spaced mould cavities
• B29C 45/64 - Mould opening, closing or clamping devices

Abstract

An injection foam molding machine according to the present invention includes: a clamping unit that moves a movable die plate 3 relative to a fixed die plate 2 to clamp the die plates; a fixed side mold attached to the fixed die plate 2; a movable side mold attached to the movable die plate 3; a plurality of drive units 50 that widen an interval between both of the die plates 2 and 3; and a die-plate-interval adjusting unit 60 that adjusts a distance over which the movable die plate 3 is moved by the drive units 50, and when a molten foam resin is foamed, an inner-side interval within the mold cavity is determined, and thus an accurate molded product can be obtained.

IPC Classes  ?

• B29C 44/02 - Shaping by internal pressure generated in the material, e.g. swelling or foaming for articles of definite length, i.e. discrete articles
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 45/77 - Measuring, controlling or regulating of velocity or pressure of moulding material
• B29C 45/80 - Measuring, controlling or regulating of relative position of mould parts

Abstract

In a mold clamping device including a fixed platen, a movable platen, a plurality of tie bars, and mold clamping half nuts, a pair of additional half members which is restricted in the axial direction of the tie bar and moves in an opening/closing direction of the half nuts relative to the mold clamping half nuts is further provided, and when the mold clamping half nuts are closed and mated with the screw or the ring groove of the tie bar, the additional half members are closed to hold the tie bar so that play at mated parts is removed or cancelled by fixation.

IPC Classes  ?

• B29C 45/64 - Mould opening, closing or clamping devices

Abstract

Disclosed is a mold temperature control circuit of an injection molding device which repeats a molding cycle that includes circulating the heating medium to a mold to heat resin to a temperature suitable for resin injection before resin injection, switching from a heating medium to a cooling medium after resin injection, and circulating the cooling medium to the mold to cool the resin down to the solidification temperature of the resin or below, wherein combined pipings are shared by piping for supplying to the mold the heating medium, the cooling medium and compressed air for scavenging, and by piping for discharging the heating medium, the cooling medium and the compressed air for scavenging.  The mold temperature control circuit of an injection molding device comprises mold bypass piping which connects together the combined piping on the heating-medium supply side and the combined piping on the discharge side, a mold bypass on/off valve, a passing heating medium sensor, and a mold temperature controller storing therein a mold temperature determination program and a passing heating medium determination program.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

Provided is a mold clamping apparatus that limits blow-out of the molding material from the mold parting surface, even if imbalance occurs in the mold opening force due to the resin pressure in the cavity, and that can extend the life of the mold. Disclosed is a mold clamping apparatus provided with a controller that estimates the mold opening force produced by mold internal pressure, determines a mold clamping hydraulic pressure value to apply to each tie bar to correspond to the estimated mold opening force, and distributes the supplied hydraulic pressure to each tie bar to give the respective mold clamping hydraulic pressure values that were determined, for molding in which the internal mold pressure is not symmetrical relative to the mold block center.

IPC Classes  ?

• B29C 45/67 - Mould opening, closing or clamping devices hydraulic
• B29C 45/82 - Hydraulic circuits

Abstract

An injection molding machine comprising: a mold having therein a cavity in which a resin is injected; a liquid supply device for continuously supplying a liquid to an internal flow path in the mold both in a preparation period which is a period before the resin is injected and in an injection period in which the resin is injected after the preparation period passes; an electric power supply device for heating the mold by supplying electric power in a part of the preparation period to an electric heater mounted to the mold; and a control device for performing a predetermined operation so that the liquid in the internal flow path has different temperatures in the preparation period and the injection period.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould
• B29C 45/12 - Injection moulding apparatus using two or more fixed moulds, e.g. in tandem
• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

An injection molding device is provided with a mold, an injection unit equipped with an injection screw that is displaceably configured such that a molten resin is filled into a cavity by forward movement to perform plural injection operations including at least a filling operation and a pressure keeping operation by displacing the injection screw, a position sensor for detecting the position of the injection screw, a temperature sensor capable of measuring the temperature of the vicinity of the cavity of the mold, a temperature adjustment unit capable of adjusting the temperature of the mold by heating or cooling the mold, a control unit for controlling the displacement of the injection screw and the temperature of the mold and determining plural switching timings of the injection operations on the basis of the position of the screw, and a display unit for displaying an image. The control unit creates a temperature waveform of the vicinity of the cavity based on an input from the temperature sensor and displays a first correlation diagram showing the correlation between the temperature waveform and a predetermined amount of change corresponding to the change of the temperature waveform and showing at least part of the determined plural switching timings of the injection operations on the display unit.

IPC Classes  ?

• B29C 45/76 - Measuring, controlling or regulating
• B29C 45/73 - Heating or cooling of the mould

Abstract

An injection molding machine for bimaterial molding equipped with two sets of injection units (11,12) capable of plasticization and injection filling of different resin materials, respectively, which injection molding machine comprises, as mold clamping means, hydraulic mold clamping means for simultaneously clamping three sets of die plates (2,3,9); as movable die plate opening/closing means (14), movable die plate opening/closing means driven by an electric motor; as rotary die plate opening/closing means (15), rotary die plate opening/closing means (14) driven by an electric motor; and, as rotating means for a rotary die plate (9), rotational driving means driven by an electric motor mounted on a reversal pedestal (7).

IPC Classes  ?

• B29C 45/12 - Injection moulding apparatus using two or more fixed moulds, e.g. in tandem
• B29C 45/16 - Making multilayered or multicoloured articles
• B29C 45/68 - Mould opening, closing or clamping devices hydro-mechanical
• B29C 45/76 - Measuring, controlling or regulating

Abstract

A clamping device comprises a stationary platen, a movable platen, tie bars, and half nuts for clamping. Another pair of additional half nuts, which are restricted in the axial direction of the tie bars and movable in the half nut opening/closing directions relative to the half nuts, is added to the afore-said half nuts for clamping. When the half nuts for clamping are closed and engaged with the tie bars through screws or ring grooves, the additional half nuts are also closed to hold the tie bars, thereby removing the rattling of the engaged portions or fixing the portions.

IPC Classes  ?

• B29C 33/22 - Opening, closing or clamping by rectilinear movement
• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B29C 33/24 - Opening, closing or clamping by rectilinear movement using hydraulic or pneumatic means
• B29C 45/66 - Mould opening, closing or clamping devices mechanical
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic

Abstract

Provided is a molding machine system enabling a free setting of execution timings of respective steps in a molding cycle of heating of a mold, injection and pressure holding of a molding material, cooling of the mold, etc. The molding machine system repeating a series of molding cycle comprises three temperature sensors arranged at predetermined places of a mold, a change-over valve unit having a heat medium channel by which heating medium from a heating unit, cooling medium from a cooling unit and pressurized air are changed over to be supplied into and recovered from the mold and a molding control means, provided on the change-over valve unit, having a temperature judging program judging respective detected temperatures of the three temperature sensors to give a judgement result and a timer to give a time set signal. A molding operation control is carried out by combining the judgement result with the time set signal and enables an arbitrary supply control of the heating medium, cooling medium and pressurized air to be supplied into the mold and an arbitrary supply control of the molding material to be supplied into the mold.

IPC Classes  ?

• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

An injection molding system which enables the temperature of a mold to be precisely regulated even when there is a delay in increasing the mold temperature upon heat supply with a heating medium; a computer program; a method of injection molding; and an injection molding machine. During each injection molding cycle, after initiation of resin injection, the temperatures of a stationary mold half and a movable mold half are regulated so as to be kept between the upper limit (TU) and lower limit (TL) of a predetermined temperature region. This temperature control of the stationary mold half and movable mold half is conducted only by turning onor off a heating medium, without conducting cooling with a cooling medium or the like. In the course of resin cooling, the temperatures of the stationary mold half and movable mold half are regulated by supplying a cooling medium, stopping the supply, supplying the heating medium, and stopping the supply so that the temperatures thereof are kept between the upper limit (TUa) and lower limit (TLa) of a temperature region effective in annealing the resin.

IPC Classes  ?

• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature

Abstract

An injection foam molding machine comprising die clamping means adapted to move movable die plate (3) with respect to fixed die plate (2) and carry out die clamping; a fixed mold fitted to the fixed die plate (2); a movable mold fitted to the movable die plate (3); multiple driving means (50) capable of increasing the interspace of the above die plates (2,3); and die plate interspace regulating means (60) capable of regulating the distance of shift of the movable die plate (3) by the driving means (50). In the foaming of molten foam resin, the inner spacing of mold cavity is determined so that an accurate molding product can be obtained.

IPC Classes  ?

• B29C 45/17 - Component parts, details or accessoriesAuxiliary operations
• B29C 45/64 - Mould opening, closing or clamping devices
• B29K 105/04 - Condition, form or state of moulded material cellular or porous

Abstract

A motor for injection molding machine exhibiting excellent durability, and a rotor of a buried magnet motor. In a plate (22) constituting the rotor (20) of a servo motor, a columnar portion (25) formed between adjacent holding holes (24, 24) serves, at a portion between the inner circumferential end (25a) and the intermediate portion (25c) thereof, as a holding portion (30) coming into line contact with a permanent magnet (23) which is thereby locked even during acceleration/deceleration of the servo motor and prevented from moving. Since the permanent magnet (23) does not butt against a specific part of the columnar portion (25) even after a long term use, the columnar portion (25) is protected against abrasion and fracture and its durability is enhanced sharply. The gap between the holding portion (30) of the columnar portion (25) and the permanent magnet (23) may be filled with filler such as electric insulating varnish, adhesive or resin to thereby close the gap between the holding portion (30) and the permanent magnet (23). Consequently, the permanent magnet (23) does not move in the holding hole (24) even during acceleration/deceleration of the servo motor and above-mentioned effect becomes more prominent.

IPC Classes  ?

• H02K 1/27 - Rotor cores with permanent magnets

Abstract

A molding machine system that is capable of freely setting of execution timings for individual operations, such as metal mold heating, molding material injection, pressure retention and cooling, in each molding cycle. There is provided a molding machine system adapted to repeat a sequence of molding cycle, comprising three temperature sensors (101) disposed at different sites of metal mold (100); switching valve unit (50) equipped with medium channels for realization of switched supply of a heating medium from heating unit (1), a cooling medium from cooling unit (30) and a pressure air to the metal mold (100) and recovery thereof; and control means (64) equipped with a program for temperature judgment and a timer and fitted to the switching valve unit (50), wherein any temperature detected by the three temperature sensors (101) is judged by the program for temperature judgment, and wherein on the basis of results of the judgment combined with time setting signal by the timer, there are carried out molding behavior controls including arbitrary supply control for the heating medium, cooling medium and pressure air fed to the metal mold (100) and arbitrary supply control of molding material to the metal mold (100).

IPC Classes  ?

• B29C 45/78 - Measuring, controlling or regulating of temperature
• B29C 45/73 - Heating or cooling of the mould
• B29C 45/76 - Measuring, controlling or regulating

Abstract

This invention provides a mold that can enhance the transferability of the surface of a molded product and can allow the molded product to be taken out immediately after the solidification, whereby molding cycle can be accelerated. In the mold, both a stationary side mold and a movable side mold are mounted within masters (4, 5), and a cavity face is formed on a release side. A plurality of heating medium passages (48a, 58a) are bored at a position distant by a given distance from the cavity face. The mold comprises a 15 to 30 mm-thick rectangular bushes (48, 58) formed of a metal having a coefficient of thermal conductivity of 20 to 40 W/(m K), heat insulating plates (38, 39) having a coefficient of thermal conductivity of not more than 5 W/(m K) and held between the masters (4, 5) and the bushes (48, 58), a pair of heating medium manifolds (49) mounted on both ends of the anticavity face of the bushes (48, 58) so as to be led to the heating medium passages (48a, 58a) of the bushes (48, 58), and a plurality of pressing members (42, 43) for pressing four edges of the bushes (48, 58) to fix the bushes (48, 58) to the masters (4, 5).

IPC Classes  ?

• B29C 33/04 - Moulds or coresDetails thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
• B29C 33/38 - Moulds or coresDetails thereof or accessories therefor characterised by the material or the manufacturing process
• B29C 45/27 - Sprue channels
• B29C 45/73 - Heating or cooling of the mould
• B29C 45/78 - Measuring, controlling or regulating of temperature