JPH01164506A - Coupling device for fixing jaw of machine tool - Google Patents

Abstract

PURPOSE:To miniaturize a projection and a recess which couple a locking body with a fixing jaw by pressing fixing jaws toward the fixing face of a locking base whose abutting area can be widened when a workpiece has been sandwichedly held to reduce the wear of engaging pats of the fixing jaw and face. CONSTITUTION:A workpiece B is mounted at the axial center pat of a chuck basic body 11, and when a driving mechanism 14 moves a locking base 21 in the axial center direction of a chuck basic body 12, a pressing face 23 on the peripheral end of the locking base 21 is pressed on the peripheral end face of a fixing jaw 25, which therefore moves in an axial center direction together with the locking base 21 to make its workpiece sandwiching pat abut on the peripheral face of the workpiece B for sandwichedly holding this peripheral face. When the workpiece B has been sandwicedly held, the jaw 25 is rotatably energized toward the locking base 21 centering around the pressing face 23 to be pressed on a fixing face 22 of the locking base 21, and thereby abuts strongly on the fixing face 22 being wide in an area to steadily hold the workpiece B. In this case, a projection and a recess which couple the locking base 21 with the jaw 25 have no outward load generated in an axial direction, resulting in reduction in their wear.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a machine tool chuck that removably clamps a workpiece, and in particular, the attachment that engages the workpiece allows the jaws to be quickly attached and detached from the chuck base. The attachment of the chuck for a machine tool as described above relates to a jaw connecting device.

(Prior Art) As a conventional art, there is one described in Japanese Unexamined Patent Publication No. 60-99505.

That is, as shown in FIG. 4, a plurality of grooves 1a are formed radially on the front side of the chuck base 1.

A locking table 2 is slidably fitted and locked in each groove, and each locking table 2 is moved radially in synchronization with the axis A of the chuck base 1 by a drive mechanism 3. .

This drive mechanism 3 engages the front part of a wedge 4, which is fitted to the axial center of the locking block 2 so as to be movable in the radial direction, with the rear part of the locking block 2, and engages the front part of the wedge 4 that is movably fitted in the axial center of the locking block 2, and A wedge groove 4a inclined in the axial direction is formed.

A cam body 5a of a drive member 5 that moves in the axial direction about the axis of the locking base 2 is engaged with this wedge groove 4a.

A claw 6 is attached to the front side of the locking base 2 so as to be slidable in the radial direction.

That is, in the above-mentioned installation, the locking base 2, on which the claw 6 is slidably abutted, is formed by extending the surface 2a in the radial direction perpendicular to the axis A, and this installation is carried out at the radial center of the surface 2a. A protrusion 7 that protrudes forward in the axial direction is formed at the portion.

This projection 7 has a head 7b on the front end side formed to have a larger diameter than its base 7a, and the projection 7 is fitted on the rear side of the claw 6 at an intermediate portion in the sliding direction. A recess 6a is formed.

This recess 6a is formed to be elongated in the radial direction, and is mounted on the axis side, that is, on the axis A side, so that when the claw 6 moves radially outward with respect to the locking base 7, the protrusion 7 An undercut portion 6b into which the axial end 7b-1 of the head 7b fits, and a pressure surface 6c against which the base axial end 7a-1 of the base 7a of the protrusion 7 abuts are formed.

Further, in the above-mentioned installation, the clamping body 8 is identified on the axis side of the claw 6, and the workpiece clamping part 8a is formed on the end surface of the front end of the clamping body 8 on the axis side.

The above-mentioned drive mechanism 3 moves the claws 6 in the direction of the axis A through each locking table 2, thereby clamping and fixing the outer circumferential surface of the workpiece B with the workpiece clamping part 8a. There was something.

(Problems to be Solved by the Invention) In the above conventional device, when the claw 6 is moved in the direction of the axis A with respect to the locking base 2, the undercut portion 6b of the claw 6 is locked. It is detached from the head 7b on the side of the stand 2 and attached using the claw 6.
is separated from the locking base 2 in the axial direction, and the claw 6 is attached to the locking base 2.
If you move it in the opposite direction to the above, that is, in the outer circumferential direction.

When the undercut portion 6b is fitted into the head portion 7b, the claw 6 is connected to the locking base 2 in the axial direction inseparably.

This provides the effect that the claw 6 can be quickly attached to and detached from the chuck base 1.

However, in the conventional device described above, the workpiece holding portion 8a is located axially outward (in the front direction) from the connecting portion between the locking base 2 and the mounting claw 6, that is, the protrusion 7 and the recess 6a. , when the workpiece B is held by the workpiece holding part 8a, an axially outward load is generated on the connection part, and this load is applied to the projection 7.
The receiver is held by the engagement force between the axial center side end 7b-1 of the head 7b and the undercut portion 6b of the recess 6a.

By the way, the axis-side end 7b-1 of the head 7b and the recess 6
The undercut portion 6b of a has the drawback that it is not possible to form a large contact area between the two, and the surface pressure of the engaging portion between the two becomes high, making it easy to wear out.

Furthermore, when the workpiece B is clamped, an axially outward force is generated at the axial center of the claw 6, so the locking table 2 is mounted on the surface 2a, and the mounting surface is on the contact surface of the claw 6. There was a drawback that a gap was created between the two and the chips entered into this part, and the centering accuracy of the workpiece B was reduced.

SUMMARY OF THE INVENTION The object of the present invention is to provide a new chuck attachment/jaw coupling device for machine tools that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, a disc-shaped chuck base is provided with a plurality of locking blocks that are moved in the radial direction by a drive mechanism, each locking block is provided with a claw that can be slid in the radial direction, and the sliding portions of both The chuck for machine tools is provided with protrusions and recesses on one side and the other side of the chuck, which are fitted and locked in an axial direction irremovably when the jaw moves radially outward relative to the locking base. The mounting is performed in a claw connecting device, and the mounting surface of the locking base on which the claws are slidably abutted is an inclined surface that is inclined in a direction in which the axial end approaches the chuck base and the outer peripheral end approaches the chuck base. The locking base is attached to the outer peripheral end of the surface, and a pressure surface that comes into contact with the outer peripheral end surface of the claw is provided, and the locking base is mounted to the end surface on the axis side of the claw, which is biased toward the chuck base with respect to the pressure surface. The structure is such that a workpiece holding portion is provided.

(Function) Since the present invention has the above configuration, when a workpiece is placed at the axial center of the chuck base and the locking table is moved in the axial direction of the chuck base by the drive mechanism, the outer periphery of the locking table is moved. The pressure surface formed on the end presses the outer circumferential end surface of the mounting claw, and as a result, the mounting claw moves in the direction of the axis along with the locking table, and the workpiece holding part comes into contact with the outer circumferential surface of the workpiece. , will hold this part.

In this case, the pressure surface of the locking table is located axially outward from the workpiece holding part of the mounting claw, so when the workpiece is clamped, the mounting claw will move toward the locking table with the pressure surface as the center. When the locking base is attached, pressure is applied to the surface.

As a result, no axial load is applied to the protrusions and recesses formed on the locking base and the mounting pawl.

Since the mounting surface has its axial end inclined toward the chuck base, the mounting claw firmly contacts the mounting surface.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, in the drawings, FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a partial right side view thereof, and FIG.
It is an enlarged sectional view taken along the line -■.

In FIG. 1, reference numeral 10 denotes the main shaft of the machine tool, and a disc-shaped chuck base 12 is fixed to this main shaft 10 via a plate 11.

A plurality of grooves 12a are formed on the front surface (right side) of the chuck base 12.
are formed radially, and the holder 13 is locked in each of these grooves 12a so as to be movable in the radial direction.

Each of these holders 13 is moved radially in synchronization with respect to the axis A of the chuck base body 12 by a drive mechanism 14.

This drive mechanism 14 has a sleeve 16 disposed at the axial center of the chuck base 12 and reciprocated in the axial direction by a drive shaft 15.
The lower end of an L-shaped swinging arm 17 rotatably supported by a pin is connected to the other end of the swinging arm 17.
The front part of the effecting body 19 and the rear part of the holder 13 are connected by a toothed engagement piece 2o, thereby converting the axial movement of the drive shaft 15 into the radial direction and moving the holder 13. It is moved in the radial direction.

A locking stand 21 is connected to the front side of each holder 13 with a bolt 30, and a claw 2 is attached to the front side of this locking stand 21.
5 is attached so that it can slide in the radial direction.

In other words, the mounting surface 22 of the locking base 21, on which the claw 25 is slidably abutted, is an inclined surface that slopes toward the axial end toward the chuck base 12 and toward the outer peripheral end toward the chuck base 12. to form.

In addition, the locking base 21 is attached to the outer peripheral end of the surface 22 to form a pressure surface 23 that comes into contact with the outer peripheral end surface of the claw 25, and the locking table 21 is attached to the end surface of the claw 25 on the axis side than the pressure surface 23. A tooth-shaped workpiece holding portion 24 is formed that is biased in the direction of the base body 12.

Further, for the above-mentioned mounting, a cylindrical protrusion 26 is formed upright in the middle part of the surface 22 in the radial direction, that is, in the extending direction,
A recess 27 into which the protrusion 26 fits is formed at the intermediate portion in the sliding direction on the rear side of the recess 27 .

The protrusion 26 has an axial end wall (the chuck base 1
2 (on the axial center line A side) is undercut to a small diameter to form an arc-shaped engagement piece 26a on the head.

In addition, the recess 27 is installed by being formed elongated in the direction of the sliding force of the claw 25, and by undercutting the bottom of its axial end wall (on the axial line A side of the chuck base 12) and forming an arcuate engagement with the rear surface. A joint piece 27a is formed.

Thereby, when the claw 25 moves radially outward relative to the locking base 27, the engagement piece 26a of the protrusion 26 is fitted into the undercut part of the recess 27, and the engagement of the recess 27 is performed. The pieces 27a are fitted into the undercut portions of the protrusions 26, respectively, and the attachment prevents the claws 25 from coming off the locking base.

Next, the operation mode of the above embodiment will be explained.

When the workpiece B is placed at the axial center of the chuck base 12 and the locking table 21 is moved in the axial direction of the chuck base 12 by the drive mechanism 14, the pressure surface 23 formed on the outer peripheral end of the locking table 21 is moved. For installation, the outer peripheral end surface of the claw 25 is pressed, and as a result, the claw 25 moves in the axial direction together with the locking base 21, and its workpiece holding part comes into contact with the outer peripheral surface of the workpiece B, and this part is moved. It will be held in place.

In this case, the pressure surface 23 of the locking table 21 is located axially outward from the workpiece holding part 24 of the mounting claw 25, so when the workpiece B is clamped, the mounting claw 25 is located on the pressure surface It is urged to rotate in the direction of the locking base 21 about 23, and the surface 22 is pressurized when the locking base 21 is attached.

In the above mounting, since the surface 22 is inclined toward the axial end side or toward the chuck base, the above mounting allows the claw 25 to firmly abut against the surface 22 and stabilize the workpiece B.
can be held.

Furthermore, when the workpiece B is clamped, no axial outward load is generated on the projections and recesses formed on the locking base 21 and the mounting claws 25, so that wear on these parts is reduced. become.

(Effects of the Invention) As is clear from the above description, in the present invention, when a workpiece is clamped, the locking table is mounted so that the claws are pressed against the surface so that the contact area can be increased. In addition, wear of the engaging portions of both can be reduced, and the protrusion and recess that connect the locking body and the mounting pawl can be made small and simple in structure.

In addition, since there is no gap between the mounting surface of the locking body and the mounting claw, chips will not enter this part, and the mounting claw will be stable when clamping the workpiece, and the workpiece will be clamped accurately for a long time. This has the effect of being able to maintain a high level for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a partial right side view thereof, Fig. 3 is an enlarged sectional view taken along line m-■ in Fig. 1, and Fig. 4 shows a conventional example. It is a sectional view of the main part. 12: Chuck base, 12a: Groove, 13: Holder, 14
: Drive mechanism, 21: Locking base, 22: Mounting surface, 23: Pressure surface, 24: Work holding part, 25: Mounting claw, 26: Projection, 26a: Engagement piece, 27: Recess, 27a: Engagement A piece. Application agent: Hisada Matsumoto Figure 2 Figure 3

Claims (1)

[Claims] 1. A disc-shaped chuck base is provided with a plurality of locking blocks that are moved in the radial direction by a drive mechanism, and each locking block is provided with a mounting claw that is slidable in the radial direction. A mounting claw for a machine tool chuck that is provided with a protrusion and a recess on one side and the other that are irremovably fitted and locked in the axial direction when the mounting claw moves radially outward with respect to the locking base. In the coupling device, the mounting surface of the locking base on which the mounting claw slidably abuts is formed into a slope that slopes in a direction in which the axial end approaches the chuck base and the outer circumferential end moves away from the chuck base, and the lock is secured. A pressure surface that comes into contact with the outer peripheral end surface of the mounting claw is provided at the outer peripheral end of the mounting surface of the stand, and a workpiece holding part is provided at the end surface on the axis side of the mounting claw, which is biased toward the chuck base with respect to the pressure surface. A mounting jaw connection device for chucks for machine tools.