JP4963828B2 - Tool holder clamping device - Google Patents

Description

  The present invention relates to a clamp device for a tool holder that holds a cutting tool such as a cutting tool or a drill blade.

  In order to detachably attach a cutting tool such as a tool to a machine tool such as a lathe, the machine tool is provided with a clamp device for a tool holder (see, for example, Patent Documents 1 and 2).

  The tool holder can hold various kinds of blades, and the tool holder holding the blades is slidably mounted in one direction on a base fixed to a predetermined position of the machine tool. The tool holder is provided with a guide groove having a substantially T-shaped cross section along the slide direction, and the base has a fastening member having a fitting portion slidably fitted in the guide groove in a direction perpendicular to the slide direction. It is provided to be movable. A cam through hole is provided in the tightening member so as to intersect the moving direction, and a cam that is rotatably supported by the base is inserted into the cam through hole.

  The tool holder can be clamped or unclamped with respect to the base by rotating the cam in any direction, moving the tightening member, and bringing the guide groove and the fitting portion into contact with or away from each other.

Utility Model Registration No. 2602016 Japanese Patent No. 2550296

  According to the clamping device of Patent Document 1, the cam is sandwiched between the balls disposed opposite to each other in the tightening member during unclamping, but since the ball and the cam are in point contact, the cam is likely to fall off from the tool holder. There is a problem of becoming. According to the clamping device of Patent Document 2, since the cam is restrained in the block by a screw for preventing the cam from coming off, there is no problem of such cam dropping off.

  However, in any of the clamping devices, if the cam is always set correctly at the unclamping position when unclamping and the clamping member is not pushed up or pushed out to the outside of the block, the clamping member may be retracted to the block side. When the cam is slightly deviated from the unclamping position, there is a problem that it becomes difficult to attach the tool holder to the block or the like.

  Accordingly, an object of the present invention is to provide a tool holder clamping device capable of solving the above-mentioned problems.

  In order to achieve the above object, the present invention adopts the following configuration.

That is, the invention according to claim 1 is characterized in that a guide groove is provided in one of a base (2) fixed at a predetermined position of a machine tool and a tool holder (3) slidably mounted on the base (2) in one direction. (13) is provided along the sliding direction, and on the other side, a fastening member (15) having a fitting part (14) slidably fitted in the guide groove (13) is perpendicular to the sliding direction. The fastening member (15) has a cylindrical shape and is provided with a cam through hole (16) so as to intersect the moving direction, and the base (2) is provided in the cam through hole (16). ) Or a cam (17) rotatably supported by the tool holder (3) is inserted through a clearance, and the cam (17) is rotated in either direction to move the tightening member (15) and guide it. Groove (13) inner surface and fitting part ( 4) In the clamping device of the tool holder that switches between clamping and unclamping with respect to the base (2) of the tool holder (3) by bringing the tool holder (3) into and out of contact, an annular groove (22) is formed in the cam (17). The ball-shaped convex part (23) from the side of the fitting part (14) is fitted in the annular groove (22) that matches the outer curved surface of the convex part in a biased state.

The invention according to claim 2, in clamping device of the tool holder according to claim 1, the convex portion which opens toward the cam through hole (16) in the member with the fastening (15) (23) guide A hole (24) is formed, and a convex portion and an elastic body (26) for urging the convex portion (23) toward the annular groove (22) are accommodated in the guide hole (24). Features.

The present invention provides a guide groove having a substantially T-shaped cross section in one of a base (2) fixed at a predetermined position of a machine tool and a tool holder (3) slidably mounted on the base (2) in one direction. (13) is provided along the sliding direction, and on the other side, a fastening member (15) having a fitting part (14) slidably fitted in the guide groove (13) is perpendicular to the sliding direction. The fastening member (15) has a cylindrical shape and is provided with a cam through hole (16) so as to intersect the moving direction, and the base (2) is provided in the cam through hole (16). ) Or a cam (17) rotatably supported by the tool holder (3) is inserted through a clearance, and the cam (17) is rotated in either direction to move the tightening member (15) and guide it. Groove (13) and fitting part (14) In the clamping device of the tool holder which is configured to switch between clamping and unclamping of the tool holder (3) with respect to the base (2) by separating, an annular groove (22) is formed in the cam (17), and the fitting portion (14) Since the ball-shaped convex part (23) from the side is fitted in the annular groove (22) that matches the outer curved surface of the convex part in the biased state, the cam (17) is rotated to the clamping position. Then, the cam (17) moves the tightening member (15) in the clamping direction, and the fitting portion (14) of the tightening member (15) is crimped to the inner surface (13a) of the guide groove (13). Thus, when the tool holder (3) is clamped and the cam (17) is turned to the unclamping position, the clamping member (15) is moved in the reverse direction by the cam (17), and the fitting portion (14) Guide groove (13 Tool holder is unclamped solved pressed in against the inner surface (13a) it is. At the time of this unclamping, since the convex portion (23) is fitted in the annular groove (22) of the cam (17) in the biased state, the cam (17) from the tool holder (3) or the base (2) Omission is surely prevented. Further, the tightening member (15) is constantly urged out of the tool holder (3) or the base (2), and the fitting portion (14) of the tightening member (15) is connected to the inner surface of the guide groove (13) ( 13a), the tool holder (3) is pushed as long as the cam (17) is in the vicinity of the unclamping position even if the position of the cam (17) does not exactly match the unclamping position. ) Floats on the base (2), so that the tool holder (3) can be mounted very easily on the base (2).

  Next, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the tool head 1 includes a base 2 and a tool holder 3 slidably mounted on the base 2.

  The base 2 is horizontally fixed with fixing bolts 5 on a lathe bed 4 which is a machine tool. The bed 4 is formed with a T-groove, and the base 2 can be fixed at a desired position on the bed 4 by moving the fixing bolt 5 within the T-groove, and can be removed from the bed 4. .

  The tool holder 3 is slidably mounted on the base 2 in one direction. That is, as shown in FIGS. 4 (A) and 4 (B), two ridges 6 are provided in parallel on the upper surface of the base 2, and as shown in FIG. A recessed groove 7 to be fitted is provided. The tool holder 3 is slidable in one direction on the base 2 under the restriction of the ridge 6 and the groove 7. Of course, the ridge 6 may be provided in the tool holder 3 and the groove 7 may be provided in the base 2.

  As shown in FIGS. 2 and 3, the tool holder 3 is provided with a cavity 9 for receiving a cutting tool 8 as a cutting tool. Above this cavity 9, a bolt 10 for fixing the cutting tool 8 accommodated in the cavity 9 is screwed, and a wedge 11 for adjusting the height of the cutting tool 8 is arranged at the bottom of the cavity 9. . Further, the tool holder 3 is provided with an insertion hole 12 for inserting and fixing a shank such as a drill blade or a boring blade (not shown).

  The base 2 and the tool holder 3 are provided with the following clamping device. By operating this clamping device, the tool holder 3 can be easily and quickly exchanged with other tool holders.

  That is, as shown in FIGS. 1 to 4, the tool holder 3 is provided with a guide groove 13 having a substantially T-shaped cross section along the sliding direction of the tool holder 3. Further, the fastening member 15 having the fitting portion 14 slidably fitted into the guide groove 13 in the base 2 is movable in a direction perpendicular to the sliding direction, that is, a direction perpendicular to the sliding surface of the tool holder 3. Provided.

  As shown in FIG. 4, the fastening member 15 is formed in a substantially cylindrical shape as a whole, and the fitting portion 14 is formed in a flange shape at one end of the cylindrical shape as shown in FIG. It is comprised by the annular protrusion 14a and the annular groove 14b adjacent to this. When the portions of the annular protrusion 14a and the annular groove 14b enter the guide groove 13, the fastening member 15 is slidably engaged with the guide groove 13.

  The guide groove 13 penetrates the tool holder 3 in parallel to the sliding direction, and the fitting portion 14 of the fastening member 15 can be detached from the guide groove 13. For this reason, the tool holder 3 can be completely removed from the base 2 and replaced with another tool holder. The fitting portion 14 of the fastening member 15 can be brought into contact with and separated from the base side surface 13a which is the inner surface of the guide groove 13, and the tool holder 3 is attached to the base 2 when the fitting portion 14 comes into contact with the surface 13a. The tool holder 3 is unclamped from the base 2 when the fitting portion 14 is separated from the surface 13a.

  The tightening member 15 is provided with a cam through hole 16 so as to intersect the moving direction, and a cam 17 is inserted into the cam through hole 16 through a clearance. The clearance is provided so that the cam 17 and the support shaft 17b can be passed through the cam through hole 16 when the base is assembled.

  As shown in FIGS. 5 (A) and 5 (B), the cam 17 is formed by supporting the cylindrical cam main body with support shafts 17a and 17b at a position slightly deviated from the central axis. The base 2 is rotatably held. One end of one support shaft 17a is exposed to the front of the base 2 as shown in FIGS. 2 and 4B, and a tool engagement hole 18 for inserting a tool such as a hexagon wrench (not shown) is formed in the exposed portion. It is formed. In addition, the front surface of the base 2 and the support shaft 17a of the cam 17 are displayed to indicate the clamp position and unclamp position of the cam 17. In this embodiment, the pointer 19 is displayed at the shaft end of the support shaft 17a of the cam 17, the letters “CLAMP” are displayed together with the pointer 20 at the clamp position on the front surface of the base 2, and the pointer 21 is displayed at the unclamp position. The characters “CHANGE” are displayed. As shown in FIGS. 2 and 5B, when the pointer 19 is rotated in either direction toward the pointer 20 at the clamp position “CLAMP”, the cam 17 moves the fastening member 15 to the opposite side of the tool holder 3. And the annular protrusion 14a of the fitting portion 14 is brought into contact with the base side surface 13a of the guide groove 13. Thereby, the tool holder 3 is clamped with respect to the base 2. Further, as shown in FIGS. 2 and 5A, when the cam 17 is turned in the opposite direction and the pointer 19 is aligned with the pointer 21 at the unclamping position “CHANGE”, the cam 17 causes the fastening member 15 to move to the tool holder 3. Then, the annular protrusion 14a of the fitting portion 14 is moved away from the base-side surface 13a of the guide groove 13 to release the pressure on the base-side surface 13a of the guide groove 13 by the fitting portion 14. Thereby, the tool holder 3 is unclamped from the base 2.

  As shown in FIG. 5, an annular groove 22 is formed in the cam 17, and a convex portion 23 urged from the fastening member 15 side is fitted into the annular groove 22. The convex portion 23 and the annular groove 22 can be formed in various shapes. In this embodiment, the convex portion 23 and the annular groove 22 are formed as a ball that is a steel ball and an annular groove that is recessed to match the curved surface of the ball.

  The convex portion 23, which is a ball, is provided in a guide hole 24 that opens toward the cam through hole 16 provided in the fitting portion 14 of the tightening member 15 so as to be able to appear and retract. The guide hole 24 penetrates from the inner surface of the cam through hole 16 toward the end surface of the fitting portion 14. After the cam 17 is inserted into the cam through hole 16, the convex portion 23 is inserted into the guide hole 24 from the fitting portion 14 side, and then an elastic body 26 made of a compression coil spring is inserted. The fitting portion 14 side is closed with a screw plug 25. As a result, as shown in FIG. 5A, in the unclamped state, the convex portion 23 is pushed by the elastic body 26 and fits into the annular groove 22, and as a result, the cam 17 is prevented from coming out of the base 2. . In addition, despite the presence of clearance between the cam 17 and the cam through hole 16, the fitting portion 14 of the tightening member 15 is pushed up toward the tool holder 3 by the pressing action of the convex portion 23. As a result, the fitting portion 14 can be easily inserted into the guide groove 13 of the tool holder 3, and a new tool holder can be easily mounted on the base 2.

  Next, the operation of the clamping device will be described.

  As shown in FIGS. 2 and 5B, when the clamp holder 3 is clamped with respect to the base 2, the pointer 19 is turned toward the pointer 20 at the clamp position “CLAMP”.

  As a result, the cam 17 is in sliding contact with the inner surface of the cam through hole 16 of the tightening member 15, and the tightening member 15 is moved to the side opposite to the tool holder 3. By the movement of the tightening member 15, the fitting portion 14 of the tightening member 15 comes into contact with the base side surface 13 a of the guide groove 13. As a result, the tool holder 3 is clamped with respect to the base 2.

  As shown in FIG. 5A, when the clamp holder 3 is unclamped from the base 2, in FIGS. 2 and 4B, the cam 17 is turned in the opposite direction to move the pointer 19 to the unclamping position “CHANGE”. To the guideline 21.

  Thereby, the cam 17 is slidably contacted with the inner surface of the cam through hole 16 of the tightening member 15, and the tightening member 15 is moved to the tool holder 3 side through the convex portion 23 and the elastic body 26. By the movement of the tightening member 15, the fitting portion 14 of the tightening member 15 is separated from the base side surface 13 a that is the inner surface of the guide groove 13. As a result, the pressing of the guide groove 13 against the base side surface 13 a by the fitting portion 14 is eliminated, and the tool holder 3 is unclamped from the base 2.

  In this unclamped state, the convex portion 23 is pushed by the elastic body 26 and fits into the annular groove 22 of the cam 17, and as a result, the cam 17 is prevented from coming out of the base 2.

  Further, although there is a clearance between the cam 17 and the cam through-hole 16, as shown in FIG. 5A, the fitting portion 14 of the tightening member 15 is pressed by the convex portion 23 and the elastic body 26. Is pushed up to the tool holder 3 side. As a result, the fitting portion 14 floats from the upper surface of the base 2, and the fitting portion 14 can be easily inserted into the guide groove 13 of the tool holder 3, and a new tool holder 3 can be easily mounted on the base 2. Can do.

  At the time of unclamping, if the pointer 19 is not accurately returned to the pointer 21 at the unclamping position “CHANGE”, if it is in the vicinity thereof, the base side surface 13a of the guide groove 13 and the fastening member 15 are urged by the urging force of the elastic body 26. A clearance is formed between the first and second fitting portions 14. Therefore, the tool holder 3 can be easily and quickly attached to and detached from the base 2.

  When the new tool holder 3 is placed on the base and the cam 17 is turned to the clamp position, the new tool holder 3 is fixed on the base 2 and can be processed on a workpiece (not shown) by a lathe. Become.

  In addition, this invention is not limited to the said embodiment, A various change is possible within the range of the summary of this invention. For example, in the above embodiment, the guide groove into which the fitting portion is fitted is formed in the tool holder and the cam is provided in the base. However, the guide groove is provided on the base side, and the cam is provided on the tool holder side. May be.

It is a top view of the tool head provided with the clamping device of the tool holder concerning the present invention. It is a front view of the tool head. It is a right view of the said tool head. (A) is a plan view of the base of the tool head, and (B) is a front view. 2A and 2B are cross-sectional views taken along the line V-V, in which FIG. 2A shows the time when the clamp device is unclamped, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Base 3 ... Tool holder 13 ... Guide groove 13a ... Inner surface of guide groove 14 ... Fitting part 15 ... Tightening member 16 ... Cam through-hole 17 ... Cam 22 ... Annular groove 23 ... Convex part 24 ... Guide hole 26 ... Elasticity body

Claims (2)

Of the base fixed at a predetermined position of the machine tool and the tool holder placed on the base so as to be slidable in one direction, one is provided with a guide groove along the slide direction, and the other is slidable in the guide groove. A fastening member having a fitting portion to be fitted is provided so as to be movable in a direction perpendicular to the sliding direction, the fastening member is cylindrical, and a cam through hole is provided so as to intersect the moving direction, A cam that is rotatably supported by the base or the tool holder is inserted into the cam through hole via a clearance, and the cam is rotated in either direction to move the tightening member to fit the guide groove inner surface. In the clamping device for a tool holder that switches between clamping and unclamping with respect to the base of the tool holder by bringing the part into and out of contact with each other, an annular groove is formed in the cam Made is, clamping device of the tool holder, characterized in that fitted into the annular groove protrusion ball-shaped from the fitting portion matches the outer shape curved surface of the convex portion in a biased state. 2. The clamping device for a tool holder according to claim 1 , wherein a convex guide hole that opens toward the cam through hole is formed in the tightening member, and the convex portion and the convex portion are formed in the annular shape in the guide hole. A clamping device for a tool holder, wherein an elastic body that biases the groove is housed.

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