JP2597119B2 - Mounting jaw coupling device for chucks for machine tools - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a machine tool chuck for holding a work in a detachable manner, and more particularly to a chuck for quickly attaching and detaching a mounting claw engaging with a work to and from a chuck base. The present invention relates to a device for connecting a hook for attaching a chuck for a machine tool.

(Prior Art) As a conventional technique, there is one described in Japanese Patent Application Laid-Open No. 60-99505.

That is, as shown in FIG. 4, a plurality of grooves 1a are radially formed on the front surface side of the chuck base 1, and the locking base 2 is slidably fitted and locked in each groove, respectively. The locking table 2 is moved in the radial direction by the drive mechanism 3 in synchronization with the axis A of the chuck base 1.

The drive mechanism 3 engages a front portion of the wedge bar 4 movably fitted in the axial portion of the locking base 2 in the radial direction with a rear portion of the locking base 2, and A wedge groove 4a that is inclined in the axial direction is formed, and the wedge groove 4a is engaged with the cam body 5a of the driving member 5 that moves in the axial direction at the axis of the locking base 2 in the wedge groove 4a.

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

That is, the locking base 2 with which the mounting claw 6 slidably abuts.
The mounting surface 2a is formed so as to extend in the radial direction orthogonal to the axis A, and a projection 7 is formed at a radially intermediate portion of the mounting surface 2a so as to protrude forward in the axial direction.

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

The concave portion 6a is formed to be elongated in the radial direction. When the mounting claw 6 moves radially outward with respect to the locking base 7 on its axial center side, that is, on the axial center line A side, the head of the projection 7 An undercut portion 6b in which the shaft end 7b-1 of the portion 7b fits, and a pressing surface 6c in contact with the base shaft end 7a-1 of the base 7a of the projection 7 are formed.

Further, the holding body 8 is fixed to the mounting nail 6 on the axis side thereof,
A work holding portion 8a is formed on the axial end face of the front end of the holding body 8.

Then, each mounting claw 6 is moved in the direction of the axis A through each locking table 2 by the driving mechanism 3 described above, whereby the outer peripheral surface of the work B is held and fixed by the work holding portion 8a. There was something.

(Problems to be Solved by the Invention) In the above-mentioned conventional one, when the mounting claw 6 is moved in the direction of the axis A with respect to the locking base 2, the undercut portion 6 b of the mounting claw 6 is moved to the locking base 2. When the mounting claw 6 is separated from the locking base 2 in the axial direction by detaching from the side head 7b, and the mounting claw 6 is moved relative to the locking base 2 in the opposite direction, that is, in the outer circumferential direction, the above-described undercut occurs. The portion 6b is fitted to the head 7b, and the mounting claw 6 is axially and inseparably connected to the locking base 2.

Thereby, there is an effect that the attachment claws 6 can be quickly attached to and detached from the chuck base 1.

However, the above-mentioned conventional type has a work holding portion 8a.
Is located axially outward (frontward) from the connecting portion between the locking base 2 and the mounting claw 6, ie, the projection 7 and the concave portion 6a, so that when the work B is held by the work holding portion 8a, An axially outward load is generated at the connecting portion, and this load is applied to the axial end 7b-1 of the head 7b of the projection 7 and the undercut portion of the recess 6a.
It will be held by the engaging force with 6b.

However, the axial end 7b-1 of the head 7b and the undercut 6b of the recess 6a cannot be formed with a large contact area, and the engaging portion of both has high surface pressure. There was a drawback that it became easy to wear.

Further, when the work B is clamped, a component force is generated in the axial center portion of the mounting claw 6 in the axial direction, so that the mounting surface 2a of the locking base 2 and the abutting surface of the mounting claw 6 contact each other. In this case, there is a disadvantage that chips are intruded into this portion and the centering accuracy of the work B is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel machine tool chuck mounting claw connecting device which solves the above-mentioned disadvantages.

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

That is, a plurality of locking bases which are moved in the radial direction by a driving mechanism are provided on a disk-shaped chuck base, and mounting claws are provided on each locking base so as to be slidable in the radial direction. A mounting claw for a machine tool chuck, comprising a projection and a recess provided on one and the other of the mounting claw so that the mounting claw can not be disengaged 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 is slidably contacted is formed on a slope inclined in a direction in which the axial end side approaches the chuck base and the outer peripheral end side separates from the chuck base. A pressurizing surface is provided at the outer peripheral end of the mounting surface of the stand to abut against the outer peripheral end surface of the mounting claw, and a work clamping portion is provided at the axial center end surface of the mounting claw that is deviated more toward the chuck base than the pressing surface. It is.

(Operation) Since the present invention is configured as described above, when the workpiece is arranged on the axial center of the chuck base and the locking base is moved in the axial direction of the chuck base by the driving mechanism, the outer circumference of the locking base is obtained. The pressing surface formed on the end presses the outer peripheral end surface of the mounting claw,
As a result, the mounting claw moves in the axial direction together with the locking base, and the work clamping portion comes into contact with the outer peripheral surface of the work, thereby clamping this portion.

In this case, since the pressing surface of the locking base is located axially outward of the work holding portion of the mounting claw, when the work is held, the mounting claw rotates in the locking base direction around the pressing surface. It is urged to move and is pressed against the mounting surface of the locking base.

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

Since the mounting surface has its axial center end inclined toward the chuck base, the mounting claws come into firm contact with the mounting surface.

(Example) Hereinafter, an example of the present invention will be described 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 expanded sectional view by the III-III line.

In FIG. 1, reference numeral 10 denotes a main spindle of a machine tool.
Disc-shaped chuck base 10 through disc-shaped mounting plate 11
Fix 12

A plurality of grooves 12a are radially formed on the front surface (right portion) of the chuck base 12, and each of the grooves 12a is provided with a holder 13a.
Is movably locked in the radial direction.

Each of these holders 13 is driven by the drive mechanism 14 to the chuck base 12.
Are moved in the radial direction in synchronization with the axis A.

The drive mechanism 14 has a drive shaft
Arrange the sleeve 16 which is reciprocated in the axial direction by 15,
The lower end of an L-shaped swing arm 17 rotatably supported by the pin 18 on the chuck base 12 to the sleeve 16 is pin-connected,
An operating body 19 is connected to the other end of the swing arm 17 by a pin, and a front portion of the operating body 19 and a rear portion of the holder 13 are connected by a tooth-shaped engaging piece 20, whereby an axial direction of the drive shaft 15 is provided. The movement is converted in the radial direction to move the holder 13 in the radial direction.

A locking base 21 is connected to the front side of each holder 13 by bolts 30, and a mounting claw 25 is mounted on the front side of the locking base 21 so as to be slidable in the radial direction.

That is, the mounting surface 22 of the locking base 21 on which the mounting claw 25 slidably abuts is formed as a slope inclined in a direction in which the axial end side approaches the chuck base 12 and the outer peripheral end side separates from the chuck base 12.

Also, a mounting claw 25 is attached to the outer peripheral end of the mounting surface 22 of the locking base 21.
A pressurizing surface 23 is formed in contact with the outer peripheral end surface, and a tooth-shaped work holding portion 24 is formed on the axial end surface of the mounting claw 25 so as to be deviated more toward the chuck base 12 than the pressurizing surface 23.

In addition, a columnar projection 26 is formed in the radial direction of the mounting surface 22, that is, in the middle part in the extension direction, and the projection 26 fits in the middle part in the sliding direction on the rear surface side of the mounting claw 25. A recess 27 is formed.

The protrusion 26 is formed on the axial end wall of the base (the chuck base 12).
Is undercut to a small diameter to form an arcuate engagement piece 26a on the head.

The concave portion 27 is formed to be elongated in the sliding direction of the mounting claw 25, and its axial center end wall (axial line A of the chuck base 12).
An undercut is made on the bottom of the (side) to form an arcuate engagement piece 27a on the rear surface.

Thereby, when the mounting claw 25 moves radially outward with respect to the locking base 21, the engaging piece 26a of the projection 26 is fitted into the undercut portion of the recess 27, and the engaging piece of the recess 27 is 27a are fitted to the undercut portions of the projections 26, respectively, to prevent the mounting claws 25 from being detached from the locking base.

Next, the operation of the above embodiment will be described. When the work B is disposed at the axial center of the chuck base 12 and the locking mechanism 21 is moved in the axial direction of the chuck base 12 by the drive mechanism 14, the pressing surface 23 formed on the outer peripheral end of the locking base 21 is moved. Mounting claw
The outer peripheral end surface of the work 25 is pressed, whereby the mounting claw 25 moves in the axial direction together with the locking base 21 so that the work holding portion comes into contact with the outer circumferential surface of the work B, and the work holding portion is held. Become.

In this case, since the pressing surface 23 of the locking base 21 is located axially outward of the work holding portion 24 of the mounting claw 25, the pressing surface 23 is The reaction force from the work B acts on 24, and the mounting claw 25
Will be pressed against the side. That is, when the work B is clamped, the mounting claw 25 is urged to rotate about the pressing surface 23 in the direction of the locking base 21, and the mounting surface 22 of the locking base 21 is rotated.
Pressure.

Since the mounting surface 22 has its axial center end side inclined toward the chuck base, the mounting claw 25 firmly abuts the mounting surface 22 having a large area to stably hold the work B. it can.

When the work B is clamped, the locking base 21 and the mounting claw are
Since the axially outward load is not applied to the projection and the recess formed in the projection 25, the wear of this portion is reduced.

(Effects of the Invention) As is clear from the above description, according to the present invention, when the work is clamped, the mounting claw is pressed against the mounting surface by the reaction force thereof, so that the mounting claw is supported by the mounting surface of the locking base. As a result, the contact area between the two can be increased.

As described above, the contact area between the mounting claw and the mounting surface is increased, so that wear between them is reduced.

In addition, since the mounting claw is supported by the mounting surface with a large contact area, the load on the projection and the concave portion connecting the locking base and the mounting claw is reduced, and a compact and simple structure can be achieved. .

In addition, since the mounting claw is pressed against the mounting surface of the locking base, there is no gap between the two, no chips enter between the mounting claw and the mounting surface of the locking base, and when the workpiece is clamped. The mounting claws are stabilized, and the work clamping accuracy can be maintained high for a long period of time.

[Brief description of the drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a partial right side view, FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1, and FIG. 4 shows a conventional example. It is principal part sectional drawing. 12: chuck base, 12a: groove, 13: holder, 14: drive mechanism, 2
1: Locking stand, 22: Mounting surface, 23: Pressurizing surface, 24: Work holding part, 25: Mounting claw, 26: Projection, 26a: Engagement piece, 27: Recess, 27
a: engagement piece.

Claims (1)

(57) [Claims] A disk-shaped chuck base is provided with a plurality of locking bases which are moved in a radial direction by a driving mechanism, and a mounting claw is provided on each locking base so as to be slidable in a radial direction. A machine tool chuck having, on one and the other of the moving parts, a projection and a concave portion which are fitted and locked in a non-removable manner in the axial direction when the mounting claw moves radially outward with respect to the locking base. In the mounting claw coupling device, the mounting surface of the locking table on which the mounting claw slidably contacts is formed as a slope inclined in a direction in which the axial end side approaches the chuck base and the outer peripheral end side separates from the chuck base. A pressurizing surface is provided at the outer peripheral end of the mounting surface of the locking base to abut against the outer peripheral end surface of the mounting claw, and a work holding portion is provided at the axial end surface of the mounting claw so as to be deviated more toward the chuck base than the pressing surface. A jaw connecting device for a chuck for a machine tool, comprising: