JPH0366538A - Work clamp device - Google Patents

Abstract

PURPOSE:To follow up variation of the reference position of a work end face by slidably moving a work supporting member to abut against the work, and locking also the work supporting member with a clamp blot for tightening a clamp arm to the work. CONSTITUTION:A work supporting member 3 supporting the end face of a work W is slidably movable, a lock nut 20 is fixedly secured to a lock pin 11 tighteningly connected to the member 3. A clamp arm 27 is rotationally movably provided on the extreme end of a clamp bolt 22 threadly connected to the lock nut 20. A sleeve 23 is rotatably fitted to the clamp bolt 22 and connected to the clamp arm 27, and also the engaging pin 31 fixed on a main body is engaged in the cam groove 30 formed on the sleeve 23 to convert axial movement of the sleeve 23 to rotational movement. Therefore, when the clamp bolt 22 is rotationally moved, the supporting member 3 is locked, the arm 27 is rotationally moved in this condition up to the position of the supporting member 3, and clamping is performed by rotational movement of the clamp bolt 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a workpiece clamping device for clamping a workpiece when performing various processing such as cutting or grinding on the workpiece.

(Prior art) When performing various cutting processes such as milling or grinding on a workpiece, a part of the workpiece is first cut with a predetermined precision to form a reference surface. After that portion is used as a positioning portion and held by a main clamp, the portion other than the positioning portion is held by an auxiliary clamp device.

(Problem to be Solved by the Invention) However, even when the workpiece is clamped by the main clamp at its positioning portion in this way, the position of the portion of the reference surface to be clamped may differ depending on the type of workpiece. In that case, the clamp position must be adjusted depending on the type of workpiece, and performing the clamping operation while performing Hy is cumbersome, and it is difficult to efficiently carry out cutting, etc. A problem has arisen in that various tasks cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable a workpiece to be clamped at a predetermined position with high precision even if the reference position for clamping the workpiece during processing changes depending on the type of workpiece.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a workpiece supporting member that supports an end surface of a workpiece in a clamp device main body so as to be reciprocally movable, and is slidably attached to the device main body. A lock nut is fixed to a lock pin that engages with and fastens the workpiece supporting member, and a clamp arm that fastens the workpiece to the workpiece supporting member is attached to the tip of a clamp bolt threadedly connected to the locknut. A sleeve rotatably provided and rotatably fitted to the clamp bolt is connected to the clamp arm, and is engaged with an engagement pin fixed to the device main body to rotate the axial movement of the sleeve. The work clamp device is characterized in that a cam groove that converts movement is formed in the sleeve.

(Function) In the work clamp device described above, when the clamp bolt is rotated with the end face of the work supported by the work support member, the work support portion is locked by the lock pin. Under this condition, when the clamp arm is rotated until its tip reaches the position of the workpiece support member, and then the clamp bolt is rotated, the workpiece is moved by the locked workpiece support member and clamp arm ε. be clamped.

(Examples) Hereinafter, the present invention will be described in detail based on drawings showing examples thereof.

As shown in FIG. 1, the workpiece clamping device of the present invention has an accommodation hole 2 formed in the vertical direction in a clamping device main body 1 consisting of a base block 1a and an upper block 1b. is a natural pin, that is, a workpiece support member 3, with a part protruding from its upper end.
is provided so as to be slidable in the vertical direction. A workpiece to be clamped is placed on the upper end of this workpiece supporting part 3. A compression coil spring 5 is provided between the adjustment screw 4 screwed to the base block 1a of the apparatus main body 1 and the workpiece support member 3 for biasing the workpiece support member upward.
is installed. This biasing force is adjusted by rotating the adjustment screw 4 and changing its position. The tip of a bolt 7 fixed to the main body 1 is engaged with the groove 6 formed in the workpiece support member 3, thereby preventing the workpiece support member 3 from rotating and being pulled out upward.

A lock pin 11 is installed in a support hole 10 formed in the main body of the device parallel to the accommodation hole 2 so as to be slidable in the vertical direction, and a tapered locking surface is provided at the tip of the lock pin 11. 12 are formed. A steel ball 14 is arranged in an opening 13 that penetrates the accommodation hole 2 and the support hole 10, and an inclined locking surface is provided at a position corresponding to the steel ball 14 in the workpiece support member 3. 15 is formed. Note that the upper end of the support hole 10 is connected to the cover 1.
6 is occluded.

A lock nut 20 is fixed to the lower end of the lock pin 11, and a clamp bolt 22 located in a guide hole 21 formed in the main body 1 of the apparatus is screwed to the lock nut 20. A sleeve 23 is fitted into the gap between the outer periphery of the clamp bolt 22 and the guide hole 21, and this sleeve 23 can rotate with respect to the guide hole 21 and also with respect to the clamp bolt 22. It is designed to be able to rotate. However, in order to prevent the clamp bolt 22 and the sleeve 23 from moving relative to each other in the axial direction, a pin 24 fixed to the sleeve 23 is engaged with a groove 25 formed in the clamp bolt 22.

A clamp arm 27 is rotatably fitted into the head 26 of the clamp bolt 22. This clamp arm 27 is a member for fastening a workpiece together with the workpiece support member 3, and is adapted to engage with the sleeve 23 through the concave-convex portion 28 and rotate together with the sleeve 23. Further, an engagement hole 29 made of a hexagonal hole or the like is formed in the head 26 of the clamp bolt 22, and by engaging a tool (not shown) with this hole 29, the clamp bolt 22 can be inserted into the clamp bolt 22.
is designed to be rotated.

When the sleeve 23 rotates together with the rotation of the clamp arm 28, this rotation movement is converted into an axial movement of the sleeve 23, while the rotation of the clamp bolt 22 causes the sleeve 23 to slide. In order to convert this axial sliding movement into a rotational movement when this occurs, a cam groove 30 is formed in the sleeve 23, and an engagement pin 31 that engages with this cam groove 30 is fixed to the device main body 1. . The cam groove 30 has a straight portion of a predetermined length extending upward from the spiral portion. Therefore, when the clamp arm 27 is rotated, the engagement pin 3 engages with the spiral portion of the cam R30.
1, the sleeve 23 moves up and down, and as the sleeve 23 moves up and down, the clamp arm 27 itself also moves up and down. At this time, clamp arm 2
The crank bolt 22 is also rotated together with the clamp bolt 7, so that the clamp bolt 22 can be moved up and down while maintaining the position of the lock pin 11 as it is. Furthermore, when only the clamp bolt 22 is to be rotated without rotating the clamp arm 27,
Due to the rotation of the clamp bolt 22, the sleeve 23 receives a force that moves it up and down, so that the engagement pin 31
When the clamp arm 27 is positioned in the linear portion of the cam groove 30, the clamp arm 27 is moved up and down.

When clamping a workpiece in such an embodiment apparatus, as a preliminary step, a reference surface S is cut into a part of the workpiece W with a predetermined accuracy, as shown in FIG. The workpiece W is arranged so that the reference surface S comes into contact with the workpiece support member 3. Therefore, as is clear from the comparison between FIG. 1 and FIG. 2, when the workpiece support member 3 supports the lower surface of the workpiece W,
This work supporting member 3 will move backward depending on the position of the reference plane S.

Next, as shown in FIG.
When the clamp bolt 26 and the lock nut 20 are screwed together, the lock nut 20 moves upward, and the lock pin 11 moves upward together with this. do. As a result, the steel ball 14 is wedged between the locking surface 12 at the tip of the locking pin 11 and the locking surface 15 of the workpiece support member 3, and the workpiece supporter 3 is in the locked state when the locking pin 11 is raised to the maximum. becomes.

Next, as shown in FIG. 4, the clamp arm 27 is rotated in the tightening direction, and the distal end portion of the clamp arm 27 is positioned above the workpiece support member 3. In this way, when the clamp arm 27 is rotated in the tightening direction, the sleeve 23 is also rotated integrally, so that the cam groove 3
0, the sleeve 23 moves downward.

As the sleeve 23 moves downward, the clamp arm 27 is moved downward. At this time, the clamp bolt 22 is rotated together with the clamp arm 27,
As a result, the lock pin 11 attempts to be moved upward, but the lock pin 11 is already in the locked state and cannot be moved upward any longer. Therefore, the clamp bolt 22 is rotated and moved downward while the lock pin 11 remains in the same position. In addition, the tip of the clamp arm 27 is
When positioned above the workpiece support member 3, the engagement pin 31 is positioned in the linear portion of the cam groove 30.

Furthermore, from this state, the clamp bolt 22 is rotated independently in the tightening direction, thereby moving the clamp arm 27 downward as shown in FIG. Then, the clamp arm 27 is pressed against the upper surface of the work W, and the work W is completely clamped by the work support member 3 and the clamp arm 27.

(Effects of the Invention) As described above, the present invention includes a workpiece support member that comes into contact with the end surface of the workpiece and a clamp arm that locks the workpiece with the workpiece support member. The work supporting member can also be locked by the clamp bolt used to fasten the clamp arm to the work, so that the reference position formed on the end face of multiple types of work can be changed. Even if
The workpiece can be clamped with high accuracy by following the position. Therefore, the workpiece can be easily clamped, and the workpiece processing efficiency can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a work clamping device according to an embodiment of the present punching, and FIGS. 2 to 5 are longitudinal sectional views showing the clamping operation of the work clamping device shown in FIG. 1. It is. DESCRIPTION OF SYMBOLS 1... Mounting body, 3... Work support member, 11...
-Lock pin, 20...Lock nut, 22...Clamp bolt, 23...Sleeve, 27...Clamp arm, 30...Cam structure, 31...Engagement pin.

Claims (1)

[Claims] A work support member for supporting an end surface of the work is provided on the clamp device main body so as to be reciprocally movable, and a lock nut is fixed to a lock pin that is slidably attached to the device main body and engages with and fastens the work support member. a clamp arm for fastening the workpiece to the workpiece supporting member is rotatably provided at the tip of a clamp bolt screwed to the lock nut, and a sleeve rotatably fitted to the clamp bolt; is connected to the clamp arm, and
A work clamping device characterized in that the sleeve is provided with a cam groove that engages with an engaging pin fixed to the device main body and converts axial movement of the sleeve into rotational movement.