Abrégé

A shrink fit tool holder that without decreasing of the strength of the tool holder, can realize a large fastening allowance by shrink fitting. Accordingly, there is provided shrink fit tool holder (10) having tool retention part (40) furnished at its distal end with tool retention hole (48) capable of insertion of tool shank part (2) of tool (1) and retention thereof, adapted to accomplish fitting of the tool (1) by inserting the tool shank part (2) in the tool retention hole (48) while having the tool retention part (40) brought into thermal expansion and cooling the same, wherein surface modification layer (50) having undergone a surfacehardening treatment selected from among carburizing treatment, nitriding treatment, carburizing nitriding treatment and coating is disposed on the surface of the tool retention part (40).

Classes IPC  ?

• B23B 31/117 - Caractérisés par les dispositifs de maintien ou de serrage ou par leurs moyens d'action directe le maintien étant assurée uniquement par friction, p. ex. en utilisant des ressorts, des manchons élastiques, des cônes
• B23Q 3/12 - Dispositifs permettant de maintenir, supporter ou positionner les pièces ou les outils, ces dispositifs pouvant normalement être démontés de la machine destinés à être fixés à une broche en général

Abrégé

A shrink fit tool holder that without decreasing of the strength of the tool holder, can realize a large fastening allowance by shrink fitting. Accordingly, there is provided shrink fit tool holder (10) having taper shank part (20) attached to a principal axis of machine and tool retention part (40) furnished at its distal end with tool retention hole (48) capable of insertion of tool shank part (2) of tool (1) and retention thereof, adapted to accomplish fitting of the tool (1) by inserting the tool shank part (2) in the tool retention hole (48) while having the tool retention part (40) brought into thermal expansion and cooling the same, wherein part of the circumferential surface of the tool retention hole (48) consists of grip member (50) with hardness higher than that of the tool retention part (40).

Classes IPC  ?

• B23B 31/117 - Caractérisés par les dispositifs de maintien ou de serrage ou par leurs moyens d'action directe le maintien étant assurée uniquement par friction, p. ex. en utilisant des ressorts, des manchons élastiques, des cônes
• B23Q 3/12 - Dispositifs permettant de maintenir, supporter ou positionner les pièces ou les outils, ces dispositifs pouvant normalement être démontés de la machine destinés à être fixés à une broche en général

Abrégé

A shrink-fit tool holder that is provided with a large amount of interference for shrink fir and from which a tool can be easily removed. The shrink-fit tool holder (10) has a chuck (40) where the shank (2) of the tool (1) is fixed by shrink fit. A tubular collet (60) having at its forward end a flange (68) extending in the radial direction is provided between the tool shank (2) and the chuck (40), and the forward end (50) of the chuck (40) is engaged in the radial direction with the flange (68) by heating the chuck (40).

Classes IPC  ?

• B23B 31/117 - Caractérisés par les dispositifs de maintien ou de serrage ou par leurs moyens d'action directe le maintien étant assurée uniquement par friction, p. ex. en utilisant des ressorts, des manchons élastiques, des cônes
• B23Q 3/12 - Dispositifs permettant de maintenir, supporter ou positionner les pièces ou les outils, ces dispositifs pouvant normalement être démontés de la machine destinés à être fixés à une broche en général

Abrégé

A shrink-fit tool holder that has a large amount of interference for shrink fit to enable a tool to be firmly fitted to the holder and has good turnout accuracy. The shrink-fit tool holder (10) has a chuck (40) having formed at its forward end a tool holding hole (48) into which the shank (2) of the tool (1) is inserted. To attach the tool (1) to the holder, the shank (2) is inserted in the tool holding hole (48) with the chuck (40) thermally expanded and then the chuck is cooled. The shrink-fit tool holder (10) further has ring members (60) fitted and fixed in the tool holding hole (48) and having insertion holes (62) and cutouts (64), the insertion holes (62) allowing the shank (2) to be inserted and held in them, the cutouts (64) each penetrating from the outer peripheral surface of the ring member to the inner peripheral surface. The cutouts of at least some of the ring members (60) are arranged at different positions around the insertion hole (62).

Classes IPC  ?

• B23B 31/117 - Caractérisés par les dispositifs de maintien ou de serrage ou par leurs moyens d'action directe le maintien étant assurée uniquement par friction, p. ex. en utilisant des ressorts, des manchons élastiques, des cônes
• B23Q 3/12 - Dispositifs permettant de maintenir, supporter ou positionner les pièces ou les outils, ces dispositifs pouvant normalement être démontés de la machine destinés à être fixés à une broche en général

Abrégé

A tap holder which can absorb an error even if it occurs in synchronization between shaft feed and rotation of the tapper body and the tap collet of a tap holder corresponding to the spindle of a machine tool through a simple arrangement and can synchronize them. The tap holder (10) being fixed to a machine tool having a tap synchronization feed mechanism, comprising a tap collet (50) for gripping a tap (40) at one end, a tapper body (20) having a fixing recess (26) for receiving the other end (52) of the tap collet (50), a fastening nut (70) for pushing the tap collet (50) into the fixing recess (26) by screwing on the tapper body (20) and engaging with one end face (54) of the tap collet (50) and securing the tap collet (50) to the tapper body (20), characterized in that the tap collet (50) is clamped in the axial direction (X) by the base surface (26a) of the fixing recess and the fastening nut (70) through elastic bodies (58, 78).

Classes IPC  ?

• B23G 1/46 - Équipement ou accessoires spécialement conçus pour les machines ou dispositifs à fileter pour tenir les outils de filetage

Abrégé

Provided are a component for a collet chuck having increased tool holding force, a collet, a tightening nut, and a collet chuck. The collet chuck (10) has a chuck body (20) having a tapered hole (22) tapered toward the end of the hole, a diameter-reducible collet (40) having a first tapered surface (44) fitted to the tapered hole (22), and a tightening nut (60) screwed to the chuck body (20). The collet chuck also has a boosting collet (80) having a first contact surface (82) and a second contact surface (86) that are in contact with a second tapered surface (46) and a third tapered surface (70), respectively. The second tapered surface (46) is formed on the outer peripheral surface of the forward end of the collet (40) and tilted such that its outer diameter is reduced toward the forward end. The third tapered surface (70) is formed on the inner peripheral surface of the forward end of the tightening nut (60) and tilted such that its inner diameter is reduced toward the front end. With the tightening nut (60) tightened to the chuck body (20), that portion of the boosting collet (80) that is located forward of the first contact surface (82) is not in contact with the outer peripheral surface of the collet (40) when the collet (40) is pressed forward.

Classes IPC  ?

• B23B 31/20 - Manchons fendus longitudinalement, p. ex. mandrins à pinces

Abrégé

A tap holder that, even if there is an error in synchronization of shaft feeding and rotation between a tapper body and tap collet of a tap holder corresponding to the main spindle of a machine tool, can absorb the error by a simple structure to achieve the synchronization. The tap holder is characterized in that a locking member (70) is inserted into the tapper body (20) and tap collet (50), at a portion where the tapper body (20) and the tap collet (50) are overlapped with each other, a recess (56) is formed in at least either of the tap collet (50) and the tapper body (20), an elastic body (58) is disposed on an inner wall (56a) defining the recess (56), and the tap collet (50) is engaged with the locking member (70) through the elastic body (58) to fix the tap collet (50) to the tapper body (20).

Classes IPC  ?

• B23G 1/46 - Équipement ou accessoires spécialement conçus pour les machines ou dispositifs à fileter pour tenir les outils de filetage

Abrégé

Provided are a component for a collet chuck having increased tool holding force, a collet, a tightening nut, and a collet chuck. The collet chuck (10) has a chuck body (20) having a tapered hole (22) tapered toward the end of the hole, a collet (40) having a first tapered surface (44) fitted to the tapered hole (22) and capable of being reduced in diameter, and a tightening nut (60) screwed to the chuck body (20). The collet chuck further has a boosting collet (80) having a first contact surface (82) and a second contact surface (86) that are in contact with a second tapered surface (46) and a third tapered surface (70), respectively. The second tapered surface (46) is formed on the outer peripheral surface of the forward end of the collet (40) and tilted such that its outer diameter is reduced toward the forward end. The third tapered surface (70) is formed on the inner peripheral surface of the forward end of the tightening nut (60) and tilted such that its inner diameter is reduced toward the front end.

Classes IPC  ?

• B23B 31/20 - Manchons fendus longitudinalement, p. ex. mandrins à pinces

Abrégé

To provide a tap holder corresponding to the main shaft of a machine tool in which even if an error occurs in the synchronization of the axial feeding and the rotation of the tapper body and the tap collect, the error can be absorbed by a simple structure. The tap holder is characterized in that, in its portion where the tapper body (20) is overlapped with the tap collet (50), a lock member (70) is inserted through the tapper body (20) and the tap collet (50), and the lock member (70) is engaged with at least one of the tap collet (50) and the tapper body (20) with an elastic body (78) interposed on both sides in the axial direction (X), and thereby securing the tap collect (50) to the tapper body (20).

Classes IPC  ?

• B23G 1/46 - Équipement ou accessoires spécialement conçus pour les machines ou dispositifs à fileter pour tenir les outils de filetage