JPH06126569A - Workpiece clamping device - Google Patents

Abstract

PURPOSE:To provide a workpiece clamping device capable of fixing the workpiece firmly without reducing a clamping force even in the presence of strong vibration. CONSTITUTION:A clamp mechanism 1 is provided which fixedly pinches a workpiece Wa from both left and right sides by a workpiece abutting parts 18 on the tips of a pair of left and right clamp pieces 13, 14 provided pivotably respectively on the centers of left and right shafts 11 parallel to each other. Projecting parts 17 centering around supported parts swingingly supporting the left and right clamp pieces on the opposite side to the workpiece abutting parts are respectively provided, and a clamp lock mechanism 3 is provided which is provided between the projecting parts of the left and right clamp pieces with wedge members 47 movable forward and backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work clamp device, and more specifically, it fixes a work by sandwiching the work from both left and right sides by a pair of left and right clamp pieces that are rotatable about left and right axes that are parallel to each other. Work clamp device.

[0002]

2. Description of the Related Art For example, when processing a connecting rod used in an engine, it is necessary to fix the connecting rod on a processing machine such as an NC machine. Conventionally, the connecting rod is fixed
It was performed by a work clamp device as shown below. That is, a device provided with a clamp mechanism that strongly clamps and fixes a work from both left and right sides by work contact portions at the tips of a pair of left and right clamp pieces that are rotatably provided around left and right axes that are parallel to each other. It was done using.

[0003]

However, in the above-mentioned conventional work clamp device, in consideration of errors of individual connecting rod constituent members and the like, a spring or the like is attached in a state in which there is some "play". It is a structure that presses the clamp piece strongly against the work by force and fixes it.For example, when strong vibration occurs during drilling, the clamping force on the work decreases and the fixed connecting rod component rattles However, there was a problem that the processing precision of could not be obtained.

The present invention has been made in view of the above circumstances, and the clamping force does not decrease even when there is strong vibration.
An object of the present invention is to provide a work clamp device that can firmly fix a work.

[0005]

In order to achieve the above object, according to the present invention, a work contact portion at the tips of a pair of left and right clamp pieces rotatably provided about left and right axes that are parallel to each other. According to the above, in the work clamp device including the clamp mechanism that clamps and fixes the work from both the left and right sides, the protrusions are provided on the opposite sides of the work contact portions with respect to the shaft-supported portions of the left and right clamp pieces. ,
A clamp lock mechanism is provided in which a wedge member is provided between the protrusions of the left and right clamp pieces so as to be able to move back and forth.

[0006]

[Operation] After the work is sandwiched by the left and right clamp pieces, the wedge member is pushed between the left and right protrusions of the clamp pieces. Thereby, the rotation of the left and right clamp pieces in the loosening direction can be restricted, and the so-called clamped state can be locked.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a work clamp device A for a rod-side connecting rod, and FIGS. 4 and 5 show a work clamp device B for a cap-side connecting rod.

In FIG. 1, reference numeral Wa is a rod-side connecting rod to be processed. The connecting rod Wa on the rod side is
The base end side (the lower side in the figure and the cap side connecting rod W)
The first clamping mechanism 1 that clamps the side abutting b) from both left and right directions, and the second clamping mechanism 2 that presses the tip side (upper side in the figure) of the rod-side connecting rod Wa downward in the figure. It is fixed in the regular position as shown,
Processing such as drilling is performed in this state. A clamp lock mechanism 3 for locking the clamped state is connected to the first clamp mechanism 1.

Explaining the first clamp mechanism 1, shafts 11 and 12 are rotatably provided in parallel with each other at appropriate intervals below the work placing table 10 on which the rod-side connecting rod Wa is placed. And these axes 1
A pair of left and right clamp pieces 13 and 14 are fixed to 1 and 12, respectively.

The clamp pieces 13 and 14 are constructed symmetrically with each other, and projecting portions 16 and 17 are formed extending vertically and bilaterally around a hole (supported portion) 15 supported by the shafts 11 and 12, respectively. And, the whole is formed in a V shape. A roller 18 is rotatably arranged on the tip side portion of the upper protruding portion 16 facing the work to form a workpiece contact portion, and the roller 20 also rolls on the tip side portion of the lower protruding portion 17. A wedge contact portion that is movably provided and contacts a wedge member 47 described later is configured.

The clamp pieces 13 and 14 are rotated by a rotating mechanism shown below. That is, as shown in FIG. 3, a cylindrical member 28 is provided on the outer periphery of an elevating shaft 27 which is vertically guided by guides 25 and 26 so as to move up and down. The portions 27a are fitted so as to be vertically movable. Cylindrical member 2
As shown in FIG. 2, a groove 28a is formed on the side of the rocking member 8, and a protruding portion 30a is formed in the groove 28a and protrudes laterally of the swing member 30 fixed to the shafts 11 and 12, as shown in FIG. Are fitted. The cylindrical member 28 has a spring 31 interposed between its upper surface and the spring stopper 29.
Is urged downward by. A groove 27a is formed on the lower end side of the elevating shaft 27, and the shaft 11, 1 is formed in the groove 27a.
The ball protrusion 33a of the swing member 33 fixed to the shaft 32 orthogonal to 2 is fitted.

When the shaft 32 rotates clockwise, for example, in FIG. 3, the cylindrical member 28 is pushed downward via the spring 31 by the elevating shaft 27 that descends as the swing member 33 rotates, and the shaft 11 accordingly. , 12 and the clamp pieces 13, 14 fixed thereto are rotated in a predetermined direction. Specifically, the left clamp piece 13 is rotated clockwise with respect to the rod-side connecting rod Wa, and the right clamp piece 14 is rotated counterclockwise. As a result, the cod side connecting rod Wa is sandwiched and fixed by the rollers 18 of the left and right clamp pieces 13 and 14.

On the other hand, when the shaft 32 rotates counterclockwise in the opposite direction to the above, the cylindrical member 28 is pushed upward by the step portion 27a of the elevating shaft 27 which rises with the rotation of the swinging member 33. The shafts 11 and 12 and the clamp pieces 13 and 14 fixed to the shafts 11 and 12 are rotated in the opposite directions to each other, so that the left and right clamp pieces 13 and 14,
The clamp of the connecting rod Wa on the rod side by 14 is released.

The second clamp mechanism 2 will be described. As shown in FIG. 3, the rod-side connecting rod W is used.
An elevating shaft 36 is provided behind the position where "a" is arranged (left in FIG. 3).
Is provided through the base 35 so as to be movable up and down, and the upper and lower ends of the elevating shaft 36 contact the tip of the rod-side connecting rod Wa and press the connecting rod Wa downward.
7 is attached. Further, a cylindrical member 38 is fitted around the lower end portion of the elevating shaft 36 so as to be vertically movable between a spring receiving member 41 and a step portion 36 a provided at an intermediate portion of the elevating shaft 36. Groove 3 on the side
A ball protrusion 40a of a rocking member 40 fixed to a shaft 39 provided in parallel with the shaft 32 is fitted to the shaft 8a. Further, a spring receiving member 41 is bolted to the lower end of the elevating shaft 36, and the cylindrical member 38 is urged upward by a spring 42 whose lower end is supported by the spring receiving member 41.

When the shaft 39 rotates clockwise, for example, in FIG. 3, the vertical shaft 36 is pushed downward via the spring 42 by the cylindrical member 38 that descends as the swing member 40 rotates, and the clamp member 37 descends accordingly. Then, the tip of the rod-side connecting rod Wa is pressed, and the rod-side connecting rod W is
Clamp a.

On the other hand, when the shaft 39 rotates counterclockwise in the opposite direction, the step 36a is pressed by the cylindrical member 38 along with the rotation of the swinging member 40, so that the elevating shaft 36 is pressed upward. Along with this, the clamp member 37 rises, and the clamp by the clamp member 37 is released.

The clamp lock mechanism 3 will be described. An elevating shaft 46 is vertically movable below the rod-side connecting rod Wa, and a wedge is provided on the outer periphery of an upper small diameter portion 46a of the elevating shaft 46. The member 47 is fitted so as to be vertically movable. The wedge member 47 has a stepped portion 47a formed inside thereof, which is brought into contact with a stepped portion 46b formed substantially in the center of the elevating shaft 46, and an upper surface portion thereof is screwed onto the upper end of the elevating shaft 46 to prevent coming off. By abutting on the nut 48, the moving range in the vertical direction relative to the lifting shaft 46 is regulated. Further, a spring 49 for urging the wedge member 47 upward is interposed between the bottom of the recess formed inside the wedge member 47 and the stepped portion 46b of the elevating shaft 46.

On the right and left sides of the upper part of the wedge member 47, as shown in FIG.
b and 47b are formed, and the inclined portion 47b contacts the roller 20 which is the wedge contact portion of the clamp pieces 13 and 14 in the clamped state when the wedge member 47 moves up. Further, a guided portion 50 is integrally formed behind the wedge member 47, and the guided portion 50 is guided by a guide 51 provided on the base 35 so that the wedge member 47 and the lifting / lowering portion can move up and down. The shafts 46 are always held on the same axis.

Further, as shown in FIG. 3, a groove 46c is formed on the lower end side of the elevating shaft 46, and the shaft 3 is formed in the groove 46c.
A ball protrusion 53a of a swinging member 53 fixed to a shaft 52 provided in parallel with the shafts 2, 39 is fitted.

When the shaft 52 rotates clockwise, for example, in FIG. 3, the wedge member 47 is pushed upward via the spring 49 by the elevating shaft 46 that rises as the swing member 53 rotates, as described above. The clamp pieces 13, 1 are brought into contact with the clamp pieces 13, 14 in a clamped state.
Keep 4 locked.

On the other hand, when the shaft 52 rotates in the counterclockwise direction contrary to the above, the lifting shaft 46 is rotated by the rotation of the swing member 53.
Is lowered and is pressed by the nut 48, so that the wedge member 4
7 descends. As a result, the inclined portion 47b is disengaged from the rollers 20 of the clamp pieces 13 and 14, and the locked state is released.

On the other hand, in the clamping device B for the cap-side connecting rod Wb shown in FIGS. 4 and 5, the first clamping mechanism 61 for clamping the base end side (upper side in the figure) of the rod-side connecting rod Wb from both left and right directions. And a second end for pressing the tip side (upper side in the drawing) of the cap-side connecting rod Wb upward in the drawing
And a clamp lock mechanism 63 for locking the clamped state are connected to the first clamp mechanism 61.

The basic structure of each of the first clamp mechanism 61, the second clamp mechanism 62, and the clamp lock mechanism 63 is the same as that used in the clamp device A for the rod-side connecting rod, and here, the same constituent elements are used. Are denoted by the same reference numerals and description thereof will be omitted.

Here, each of the above-mentioned mechanisms 61, 62, 63
Since the cap side connecting rod Wb is arranged upside down with respect to the rod side connecting rod, it is arranged opposite to the work clamp device A.

Reference numeral 70 in FIG. 3 denotes a pressing member that presses the rod-side and cap-side connecting rods Wa and Wb, which are arranged at regular positions, from the front side in both the work clamp devices A and B described above.

Next, the work clamp device A having the above structure,
The action of B will be described. In order to process the rod-side connecting rod Wa using the work clamp device A, first, as shown in FIG. , Place the work clamp device A at the proper position.

Next, the first clamp mechanism 1 and the second clamp mechanism
The clamp mechanism 2 is operated to clamp the rod-side connecting rod Wa placed at the regular position. Specifically, the shaft 32 is rotated clockwise in FIG.
The elevating shaft 27 is lowered via the, and the cylindrical member 28 is lowered via the spring 31. As a result, by rotating the left and right clamp pieces 13 and 14, the base end portion of the rod-side connecting rod Wa arranged at the regular position is clamped from the left and right sides by the first clamp mechanism 1.

At the same time, the shaft 39 is rotated clockwise in FIG. 3 to lower the elevating shaft 36 via the swing member 40, the cylindrical member 38 and the spring 42, and the clamp member 37 attached to the upper end thereof. To lower. As a result, the tip end of the rod-side connecting rod Wa arranged at the regular position is pressed downward and clamped by the second clamp mechanism 2.

Then, after the base end side of the rod-side connecting rod Wa is clamped by the first clamp mechanism 1 as described above, this state is locked by the clamp lock mechanism 3. That is, the shaft 52 is rotated clockwise in FIG.
The wedge member 47 is provided via the lifting shaft 46 and the spring 49.
Raise. Then, the left and right inclined portions 47b of the wedge member 47 are attached to the left and right clamp pieces 1 in the clamped state.
By contacting the roller 20 which is the wedge contact portion of 3 and 14, the clamp pieces 13 and 14 are strongly pressed in the clamping direction and the rotation in the opposite direction is restricted. This locks the clamped state by the first clamp mechanism 1.

Although the clamp lock mechanism 3 is operated after the first and second clamp mechanisms 1 and 2 are operated in the above description, the invention is not limited to this, and the first clamp mechanism 1 is operated. Then, the clamp lock mechanism 3 is immediately actuated, and then the second clamp mechanism 2 is operated.
May be activated.

In this way, by the clamp lock mechanism 3,
Since the clamped state by the first clamp mechanism 1 is locked, it is possible to prevent the rod-side connecting rod Wa, which is a workpiece, from rattling even when strong vibration occurs during machining such as drilling after the clamp. Therefore, the processing accuracy can be improved. Further, since the wedge member 47 is used to lock the clamped state, the left and right clamp pieces 13 and 14 can be simultaneously locked by simply moving the one wedge member 47 up and down. It is also possible to obtain the advantage that the right and left clamp pieces 13 and 14 can be locked in a balanced manner with a uniform pressing force.

When the rod-side connecting rod Wa has been drilled, the shaft 52 is rotated counterclockwise to lower the elevating shaft 46, and the nut 48 attached to the upper end of the elevating shaft 46 is used. The wedge member 47 is forcibly lowered to release the locked state by the clamp lock mechanism 3.

Then, the shaft 32 is rotated counterclockwise in FIG. 3, and the cylindrical member 28 is forcibly lifted via the lifting shaft 27. Thereby, the swing member 30 and the shafts 11, 1
The clamp pieces 13 and 14 are rotated in the direction opposite to the clamp direction, that is, in the loosening direction via 2 to release the clamp by the first clamp mechanism 1.

At the same time, the shaft 39 is rotated counterclockwise in FIG.
By forcibly raising the clamp member 37,
The clamp by the second clamp mechanism 2 is released.

Even when the connecting rod Wb on the cap side is processed, the clamped state by the first clamp mechanism 61 can be locked by the clamp lock mechanism 63 in the clamped state. Even when strong vibration occurs during machining such as machining, it is possible to prevent the cap-side connecting rod Wb, which is a workpiece, from rattling, and it is possible to improve machining accuracy.

The work clamp device of the present invention is not limited to the configuration of the above-mentioned embodiment, and the external shape and dimensions and the specific configuration of each device arranged inside are appropriately changed in the implementation. It is possible.

For example, in the above embodiment, the rod-side and cap-side connecting rods Wa and Wb are to be clamped.
However, the present invention is not limited to this and the present invention can be applied to the case of clamping other members.

Further, in the above embodiment, in the clamp device A for the rod-side connecting rod Wa, for example, in order to move the wedge member 47 of the clamp lock mechanism 3 upward in the locking direction, the wedge member 47 is pushed and moved via the spring 49. However, the present invention is not limited to this, and it may be configured to push and move via an air cylinder.

[0039]

As described above, according to the present invention, the left and right clamp pieces are provided with protrusions on the opposite sides of the work contact portion with respect to the shaft-supported portions, and the left and right clamp pieces are protruded. Since a clamp lock mechanism is provided that allows the wedge member to move back and forth between the two parts, the work piece is sandwiched between the left and right clamp pieces, and then the wedge member is pushed between the left and right protrusions of these clamp pieces. The so-called clamped state can be locked by restricting the rotation of the clamp piece in the loosening direction, and even if strong vibration occurs during machining, the work clamping force does not decrease, and high-precision machining can be realized. Also, a wedge member is used to lock the clamped state, and by simply moving this one wedge member up and down, the left and right clamp pieces can be locked simultaneously, thus reducing the number of parts. It has an excellent effect that the left and right clamp pieces can be locked with a uniform pressing force in a well-balanced manner.

[Brief description of drawings]

FIG. 1 is a front view showing a clamp device for a rod-side connecting rod.

FIG. 2 is a cross-sectional view showing a first clamp mechanism of the clamp device.

FIG. 3 is a cross-sectional view of the clamp device.

FIG. 4 is a front view showing a clamp device for a cap-side connecting rod.

FIG. 5 is a cross-sectional view of the clamp device.

[Explanation of symbols]

 1 First Clamping Mechanism 2 Second Clamping Mechanism 3 Clamp Locking Mechanism 11 Shaft 12 Shaft 13 Clamping Piece 14 Clamping Piece 15 Hole (shaft supported part) 17 Projection 18 Roller (workpiece contact part) 21 Roller (wedge wedge) Contact part) 46 Lifting shaft 46a Upper small diameter part 46b Step part 47 Wedge member 47a Step part 47b Inclined part 48 Nut 49 Spring 52 Axis 53 Swing member 53a Ball protruding part A Work clamp device B Work clamp device Wa Rod side connecting rod Wb cap Side connecting rod

Claims (1)

[Claims] 1. A clamp mechanism is provided which clamps a work by sandwiching the work from both left and right sides by means of work contact portions at the tips of a pair of left and right clamp pieces that are rotatably provided around left and right axes that are parallel to each other. In the work clamp device, a protrusion is provided on each of the left and right clamp pieces on the side opposite to the work contact portion with the shaft-supported portion as the center, and a wedge member is advanced and retracted between the protrusions of the left and right clamp pieces. A work clamp device having a clamp lock mechanism freely provided.