Abstract

The present invention relates to the technical field of composite material shaping fixtures. Disclosed are a large-size curved surface component shaping fixture and a use method. The large-size curved surface component shaping fixture comprises a shaping assembly and an end pressing plate arranged on the shaping assembly; the shaping assembly comprises a first shaping plate, a second shaping plate, and a third shaping plate which are connected in sequence; the first shaping plate, the second shaping plate, and the third shaping plate are respectively provided with a first slot, a second slot, and a third slot; the first slot, the second slot, and the third slot are communicated in sequence to form a component slot; and the end pressing plate and the third shape shaping plate are oppositely arranged. According to the present invention, the structure is simple, a combined fixture structure is used, and such a design method not only improves the machinability of a complex profile of a fixture and facilitates assembling and disassembling, but also enhances the convenience of transportation and operation, and effectively reduces manufacturing costs.

IPC Classes  ?

• C23C 16/458 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber

Abstract

A bolt tightening structure, comprising a screw rod (11), a screw cap (12) arranged at one end of the screw rod (11), a special-shaped lock washer (5) sleeved on the screw rod (11), and a nut assembly (2), wherein the screw cap (12) is provided with a first clamping recess (121) and two first lock bosses (122); the special-shaped lock washer (5) is provided with a second clamping recess (51) and a second lock boss (52); the first clamping recess (121) and the second clamping recess (51) are joined to form a cross-shaped structure; the two first lock bosses (122) and the second lock boss (52) form a lock boss; a first part (3) and a second part (4), which are to be connected, are provided with oblong holes (6); the lock boss matches the oblong holes (6) in terms of size, and is located in the oblong holes (6); and the nut assembly (2) is sleeved on the screw rod (11) and is in pushing contact with the first part (3).

IPC Classes  ?

• F16B 39/282 - Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
• F16B 35/06 - Specially-shaped heads

Abstract

The present invention relates to a diamond tool for processing a continuous fiber toughened SiC ceramic matrix composite material, and a preparation method therefor, and aims to solve the technical problems of short service life and high cost of an existing diamond tool, and low efficiency of the diamond tool prepared by an existing processing method. The tool comprises a diamond cutting head and a metal matrix, which is fixedly connected to the diamond cutting head, wherein a first end of the metal matrix is provided with a connecting shaft, and the end face of a second end is provided with a positioning boss; and an end face of the diamond cutting head is provided with a positioning groove matched with the positioning boss. The method comprises: 1. a process for preparing a diamond cutting head, which process involving: taking, in parts by weight, 15-30 parts of a diamond powder, 5-20 parts of a SiC powder, 2-19 parts of a silver powder, 3-20 parts of a tin powder, 30-70 parts of a bronze powder and 5-40 parts of an aluminum oxide ceramic hollow sphere, and mixing the materials; filling powder; charging the materials in a furnace and sintering same, and cooling same and demolding same; and 2. fixedly connecting the diamond cutting head and the metal matrix, and then processing same and edging same to obtain a diamond tool.

IPC Classes  ?

• B24D 7/06 - Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front faceBushings or mountings therefor with inserted abrasive blocks, e.g. segmental
• B24D 3/06 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic
• B24D 3/34 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
• B22F 3/14 - Both compacting and sintering simultaneously

Abstract

The present invention relates to the technical field of gas-turbine engine structures, and in particular to a floating-type ceramic matrix composite turbine outer ring, and an assembly structure and method for same and a casing. The problems that because of high thermal stress at a connection position of a turbine outer ring and a casing, the connection position of the turbine outer ring and the casing is prone to local cracking, and a sealing effect of a large radial clearance between the turbine outer ring and rotor blades is poor are solved. The floating-type ceramic matrix composite turbine outer ring comprises a ceramic matrix composite turbine outer ring main body and floating-type connection structures. By means of the floating-type connection structures, the connection strength and reliability of the ceramic matrix composite turbine outer ring and a turbine casing can be improved, and the turbine outer ring can float up and down in the radial direction of an engine, thereby implementing adaptive adjustment of the clearance between the turbine outer ring and turbine rotor blade tips. Thus, the reduction of a fit clearance between the turbine outer ring and the turbine rotor blade tips is facilitated, a sealing effect of the turbine rotor blade tips is improved, and the comprehensive effectiveness of a turbine of the engine is improved.

IPC Classes  ?

• F01D 9/04 - NozzlesNozzle boxesStator bladesGuide conduits forming ring or sector
• F01D 25/28 - Supporting or mounting arrangements, e.g. for turbine casing
• F01D 11/08 - Preventing or minimising internal leakage of working fluid, e.g. between stages for sealing space between rotor blade tips and stator

Abstract

The present invention relates to a ceramic-based composite material turbine outer ring preform, a shaping mold, and a use method therefor, which overcome the disadvantages of high difficulty in designing a fiber preform for a ceramic-based composite material turbine outer ring, poor molding pasting uniformity of the fiber preform, and low protection of the fiber preform during demolding. The preform comprises an omega-shaped cover plate preform, an arc-shaped pipe section preform, and an arc-shaped plate preform. The foregoing type of structural design solution is not only beneficial in reducing the number of preforms and reducing the difficulty of shaping of the preforms, but also greatly improves molding pasting uniformity and the bonding strength between the preforms. The shaping mold comprises an outer molding mold and an inner molding mold. An external contour of the preform is shaped by using the form of a split mold, and a rectangular rotary cavity of a component is shaped by means of the inner molding mold. While simplifying the structure of the shaping mold and ensuring high protection of the fiber preform, mold closing and demoulding efficiency are also greatly improved, thereby reducing shaping difficulty.

IPC Classes  ?

• F01D 9/04 - NozzlesNozzle boxesStator bladesGuide conduits forming ring or sector

Abstract

The present invention relates to a mold preparation process, and in particular to a cylindrical structural member mold and a method for preparing a cylindrical structural member. The existing technical problems that cylindrical structural members of SiC/SiC and C/SiC composite materials are easily deformed during formation and diameters become larger after formation are solved. The mold of the present invention comprises a mold assembly and a shaping tool; the mold assembly comprises two positioning rings, a connecting rod, and an inner mold and an outer mold that are coaxially sleeved from inside to outside. The outer side surface of the inner mold is used for being wrapped by a fiber fabric, and the height of the inner mold is greater than the width of the fiber fabric; evenly distributed grooves are formed on each of two end faces of the inner mold; the outer mold comprises a first outer mold, a second outer mold, and a third outer mold; the second outer mold is sleeved on the middle portion of the inner mold on which the fiber fabric is wound; the first outer mold wraps the upper portion of the inner mold and the upper end face of the inner mold; the third outer mold wraps the lower portion of the inner mold and the lower end face of the inner mold. The present invention further provides a method for preparing a cylindrical structural member.

IPC Classes  ?

• B29C 70/46 - Shaping or impregnating by compression for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
• C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
• B28B 21/48 - Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces by wrapping, e.g. winding
• B28B 21/82 - Moulds built-up from several partsMultiple mouldsMoulds with adjustable parts
• B28B 1/40 - Producing shaped articles from the material by applying the material on to a core, or other moulding surface to form a layer thereon by wrapping, e.g. winding

Abstract

The invention relates to a chemical vapor infiltration flow guide device and a method for preparing ceramic composite pipes by means of same, in order to solve problems such as non-uniform density gradients, a non-uniform performance, and residual stress of ceramic composite slender pipes prepared by means of an existing chemical vapor deposition process. The flow guide device comprises a gas mixing chamber and a flow guide pipe, wherein a gas inlet is formed in the top of the gas mixing chamber, and a flow guide pipe mounting hole is formed in the bottom of the gas mixing chamber; a plurality of first flow guide holes are formed in a side wall close to the bottom of the gas mixing chamber; one end of the flow guide pipe is fixed into the flow guide pipe mounting hole of the gas mixing chamber; and a plurality of second flow guide holes are formed in a wall of the flow guide pipe. The flow guide device of the present invention is combined with a chemical vapor infiltration furnace, so that the density uniformity of the ceramic composite slender pipes can be significantly improved, thereby improving the performance uniformity and eliminating the residual stress.

IPC Classes  ?

• C04B 41/81 - Coating or impregnating

Abstract

The present invention relates to a tool and method for internal and external powder embedding and molten silicon infiltration of a 2D, 3DN ceramic matrix composite component, and aims at solving the technical problems that during the preparation, by means of an RMI process, of a large-size 3DN nozzle preform having a circular cross-section in the 2D, 3DN ceramic matrix composite component, a 2D part is easily eroded by a silicon melt to cause performance degradation, the high temperature modification of the 3DN nozzle preform at the contact surface position between the 2D part and the 3DN nozzle preform is difficult, the process of overall densification of the component is difficult, and the 3DN nozzle preform is easily deformed during a modification process. The tool comprises a crucible, a 2D part graphite protection tool, a graphite column, a graphite supporting piece, a graphite inner support, a composite deformation control tool, and (N-1) first annular graphite paper stack layers, N being greater than or equal to 3. The method is carried out using the tool; process methods, such as pre-tool protection of the 2D part b, and internal and external powder embedding and filling, are used in combination with a specific tool, such that the near-net-size RMI process of a large-size ceramic matrix composite component having a circular cross-section is implemented, thereby reducing the difficulty of subsequent processing and assembling.

IPC Classes  ?

• F27B 14/04 - Crucible or pot furnacesTank furnaces adapted for treating the charge in vacuum or special atmosphere
• F27B 14/16 - Arrangement of devices for charging
• C04B 35/80 - Fibres, filaments, whiskers, platelets, or the like
• C04B 35/65 - Reaction sintering of free metal- or free silicon-containing compositions

Abstract

44C matrix is used in a bar blank deposition process, so that the density uniformity of the bar blank can be further improved. Compared with the existing preparation method for the carbon/silicon carbide composite material bolt, the preparation method for the silicon carbide/silicon carbide composite material bolt of the present invention has the advantage of the shearing strength of the bolt being significantly improved to 240-320 MPa.

IPC Classes  ?

• C04B 35/80 - Fibres, filaments, whiskers, platelets, or the like
• C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
• C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
• F16B 19/04 - RivetsSpigots or the like fastened by riveting
• F16B 35/00 - Screw-boltsStay boltsScrew-threaded studsScrewsSet screws