JP2001157938A - Work clamping apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main clamping apparatus which is simplified as a single parts, easy in clamping operation of a work, easy in positioning the work to a clamping body, and easy in attachment/detachment of the work, and provide an auxiliary clamping apparatus which is used together with the main clamping apparatus and excellent in clamping operation. SOLUTION: The clamping body 12 is mounted on a supporting shaft 11 erected on a fitting base 1 in an eccentrically turnably and vertically movable manner, and a locking member 13 to fix the clamping body 12 in a turnable and vertically immovable manner at a predetermined position of the supporting shaft 11. The clamping body 12 is substantially circular in plan view, has a substantially V-shaped fit-in recess 17 partly or entirely around the circumference thereof, and the fit-in recess is fitted in and tightened to an edge of the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece clamping apparatus, and more particularly, to a workpiece such as a milling machine for fixing a workpiece (work) set for performing a plane processing such as grinding or a drilling. It relates to a clamping device.

[0002]

2. Description of the Related Art Conventionally, as a clamping device of this type, as shown in, for example, Japanese Utility Model Application Laid-Open No. 5-49228, a rotating body 20 having a fitting recess 21 at one end of a clamp body 10 is rotatably connected. A structure is known in which the clamp main body 10 is fixed to the processing machine table 30 in a state where the fitting concave portion 21 of the rotating body 20 is fitted to the corner of the work 40.
However, in the above-described clamp device, the clamp body 10 is moved forward and backward toward the workpiece, and the bolt 32
Is tightened by a nut 35, and the height adjustment of the clamp body is performed by a step table 33 arranged at one end of the clamp body. For this reason, in the above-described conventional apparatus, it takes time and effort to perform the positioning operation and the tightening operation between the work and the clamp main body. This has been a factor in reducing productivity.
Further, since a step stand separate from the clamp body is required, there is a problem that the number of components is large, the shape is complicated, and the production cost is high.

A work material (work) is mainly mounted on a milling machine by using a processing machine table (mounting base plate).
A convex device having a fixed height formed on the upper surface, and a clamp device for clamping the work and locking the movable portion by the convex portion and the movable portion moving up and down above the convex portion, that is, a main clamp for fixing the work with a strong force. Three sets of devices are provided.
Thereby, it is possible to securely fix even a work having a slightly curved shape. However, even when the work is fixed at three points by the above three sets of main clamping devices, the fixing operation by the main clamping device is small at a position outside the range S surrounded by the line connecting the three points, There is a problem in that the work is distorted when processing is performed on the portion and a processing error increases (see FIG. 1).
reference). If the main clamp device is moved to fix the work again in order to solve the problem, a time loss for that will occur, and it is conceivable to use four or more sets of main clamp devices. It is necessary to make the height of the convex portion supporting the lower surface of the work variable, which not only complicates the structure but also complicates the operation. For this reason, there has been a demand for the development of a clamp device which is additionally provided at a position outside the range S surrounded by three points by the main clamp device and which is excellent in clamp operability.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clamping device which is simplified in view of the above-mentioned conventional circumstances and which can be simplified as a single component and which can easily perform a clamping operation on a workpiece. Another object of the present invention is to simplify the operation of positioning the workpiece and the clamp body, and further facilitate the operation of engaging and disengaging the clamp body with the workpiece, in other words, the operation of attaching and detaching the workpiece. And It is a further object of the present invention to provide an auxiliary clamping device which is used together with the main clamping device, and which is excellent in operability in clamping and has a great benefit in use.

[0005]

According to the clamp device of the present invention, a clamp body is eccentrically mounted on a support shaft erected on a mounting board so as to be eccentrically rotatable and vertically movable. A lock member that is fixed at a predetermined position of the support shaft so as to rotate and cannot move up and down is provided, and the clamp body has a substantially circular shape in plan view and has a substantially V-shaped fitting concave portion over a part or the entire circumference of the outer peripheral surface. The fitting recess is fitted and fastened to the edge of the workpiece (claim 1). According to the present invention, one or a plurality of clamp bodies are erected on a mounting base plate of a processing machine by a support shaft at a predetermined position on the outer periphery of a work, and the clamp body is rotated around the outer periphery of the work, thereby The fitting recess is fitted to the edge of the work and tightened, and the clamp member is fixed to the support shaft by the lock member to complete the operation. Then, the clamp member is released from the work edge by releasing the lock member and rotating the clamp body in the opposite direction.

The mounting table is a processing table or a processing jig of a processing machine, and a workpiece (hereinafter, referred to as a workpiece) is mounted and fixed on the mounting table. The clamp body has a substantially circular shape in plan view, that is, a cam shape having a perfect circular shape, an elliptical shape, or a fan shape, and is eccentrically attached to the support shaft. The fitting concave portion of the clamp body is formed in a substantially V-shaped cross section on the outer peripheral surface of the clamp body, more specifically, in a horizontal V-groove shape or a trapezoidal groove shape when the clamp body is arranged horizontally. This clamp body fits and clamps the edge of the work in the fitting recess, and the fitting recess can cope with a work having a different thickness to some extent depending on its shape. It is preferable to prepare a plurality of types of clamp bodies having fitting recesses having different groove widths.

If the fitting recess can secure a sufficient range for tightening by sequentially approaching the edge of the work by the rotation of the clamp body, it is not always necessary to form the fitting recess over the entire outer peripheral surface of the clamp body. It may be formed on a part of the surface. In this case, the fitting concave portion on the outer peripheral side of the clamp body having a short distance from the support shaft is omitted. Even in this case, it is preferable that the lower side of the fitting concave portion in the relevant portion is not omitted (cut away). That is, the clamp body has a shape in which the upper side of the fitting recess is cut off in a predetermined range of the outer peripheral portion on the side where the distance from the support shaft is short, and thereby, the workpiece is clamped through the cut portion. It is mounted or detached from the lower side of the fitting recess (claim 2).

Furthermore, in order to easily adjust the height between the clamp body and the work, it is preferable that the clamp body is urged upward by a spring member. That is, the clamp body is allowed to move up and down along the support shaft, and the fitting recess of the clamp is located near the height of the work edge. In particular, in combination with the configuration of the second aspect, the lower side of the fitting recess always comes into contact with the lower surface of the edge of the work, so that the height of the clamp body and the work are automatically adjusted.

The structure of the lock member is not particularly limited as long as it fixes the clamp body at a predetermined position of the support shaft so as not to be able to move up and down. A boss portion for penetrating the support shaft into the body is integrally formed, and a lock member is screwed to the boss portion and provided on a lock shaft that can reciprocate in a direction substantially perpendicular to the support shaft and an outer end of the lock shaft. With the provided operation unit, the configuration is a thumb screw mode (claim 4). As a result, the operating portion of the lock member is grasped by hand, and the clamp body is moved up and down and rotated to perform the positioning operation and the clamping operation. Further, the clamp device of the present invention can be used as a main clamp device for fixing a work to a mounting base plate, but is preferably used together with a conventional main clamp device of a stationary type (claim 5).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings in the case of a clamping device used as an auxiliary for three sets of main clamping devices. The work W is a die-cast aluminum base (bottom plate substrate) made of aluminum, which is fixed to a mounting base 1 which is a processing table of a milling machine, and is subjected to flat processing and drilling. For example. The illustrated electronic weighing base has a stepped portion or a curved portion instead of a mere flat plate shape, and a load cell or a frame is attached to the processed upper surface by screwing a pin, a shaft, or the like. .

As shown in FIGS. 1 to 3, the mounting board 1
On the upper surface thereof, two positioning tables 2 and 3 are arranged, a work W is placed on the positioning tables 2 and 3, and the work W
The main clamp devices 4, 5, and 6 are arranged on the outer periphery of the clamp device 10, and the clamp device 10 or 10 of the present invention is located at a position outside a range S surrounded by a line connecting the main clamp devices 4, 5, and 6. 30 is provided. Each of the positioning tables 2 and 3 is set to a height that abuts on the bottom surface of the corresponding portion of the work W, and pins 2a and 3a are protruded from the respective upper surfaces thereof and inserted into positioning holes of the work W, thereby enabling the X of the work W to be adjusted. Positioning is performed by restricting movement in the direction and the Y direction.

The main clamping devices 4, 5, and 6 are conventionally known clamping devices such as swing clamps. The main clamping devices 4, 5, and 6 are composed of a convex portion 7 in contact with the bottom surface of the work W and a movable portion 8 that moves up and down on the top surface of the work W. The work W is fastened and fixed with a strong force by locking the movable portion 8 to the upper surface of the work W in a press-contact manner. That is, the work W is fixed at three points by the main clamping devices 4, 5 and 6 with strong force. The clamping device 10 or 30 respectively
1, a clamp body 12 or 32, a thumb screw 13 serving as a lock member, and a spring 14. The clamp device 10 and the clamp device 30 are
Are the same except that they are mounted upside down on the support shaft 11. Therefore, first, the clamp device 10 will be described with reference to FIGS. 4 to 6, and then the clamp device 30 will be described with reference to FIG.

The clamp device 10 selects a mounting hole 15 at a predetermined position corresponding to the shape of the work W from a plurality of mounting holes 15 opened in the mounting base plate 1, and inserts the support shaft 11 into the mounting hole 15. Is detachably erected by screwing or the like and attached to the mounting base plate 1. The clamp device 10 sequentially fits a spring 14 as a spring member and a clamp body 12 from the upper end of the support shaft 14, and attaches and detaches a stopper 16 at the upper end of the support shaft 14 to prevent the clamp body 12 from coming off. By being mounted as possible, it is set on the mounting board 1. The clamp body 12 is fitted on the support shaft 14 so as to be able to rotate and move up and down, and the spring 14 urges the clamp body 12 upward, whereby the spring 1
The base 4 is attached to the support shaft 11 so as to be elastically movable up and down along with the support shaft 11.

The clamp body 12 is a plate having a substantially circular shape in plan view and having a predetermined thickness, and has a substantially V-shaped outer peripheral surface, more specifically, a laterally trapezoidal fitting recess 1 having an opening facing the outer surface.
7 is formed over substantially the entire circumference, and a cylindrical boss 1 is formed on the upper surface.
2a is formed integrally. The boss 12a is formed such that its axis is eccentric from the axis of the clamp body 12, and the boss 12a has a slide hole 1 that penetrates through the clamp 12 in the axis of the boss 12a.
8, and the hole 18 is slidably fitted on the support shaft 11. As a result, the clamp body 12 is
And is mounted eccentrically and rotatably and vertically movable. The fitting recess 17 has a cam-type outer peripheral shape in which the distance is gradually increased from the side with the shortest distance to the support shaft 11 (hereinafter, referred to as the eccentric short side) to the opposite side (hereinafter, referred to as the eccentric long side). Present.

In the boss portion 12a, a tap hole 19 is formed in the peripheral surface so as to be orthogonal to the support shaft 11, and the thumb screw 13 is screwed into the tap hole 19, and the thumb screw 13
Is rotated so that the tip of the thumbscrew 13 is pressed against the support shaft 11. Thereby, the clamp body 1
2 can be locked at a desired position of the support shaft 11 such that the support shaft 2 cannot rotate and cannot move up and down. A collar 20 made of brass or the like having a lower hardness than the support shaft 11 is interposed between the thumbscrew 13 and the support shaft 11 to protect the support shaft from wear and damage.

The fitting concave portion 17 of the clamp body 12 has a V-shaped portion formed at an angle of about 60 degrees, and has a trapezoidal groove for flattening the bottom so as to increase the load resistance. (See FIG. 3). The fitting recess 17 is formed by cutting off the upper side 17a of a part of the fitting recess 17 over a predetermined range on the eccentric short side.
1 is formed, and the work W is made detachable from the cut portion 21. That is, when the work W is placed on the positioning tables 2 and 3, the work W can be brought into contact with the lower side 17 b of the fitting recess 17 through the cut portion 21, and the work W can be lifted through the cut portion 21 even when the work W is removed. Further, the position of the thumb screw 13, that is, the arrangement of the tap 19 is arranged at a position where the operation is most easily performed in relation to the work W, and specifically, at a position approximately 45 degrees from the center on the eccentric length side. Preferably, it is provided (see FIG. 5).

The operation of the clamp device 10 will be described. When attaching the workpiece W to the mounting base 1, the clamp device 10 removes the clamp body 12 from the cut portion 21.
The eccentric short side with the gap is located on the work mounting space side. When the work W is placed on the positioning tables 2 and 3,
Since the edge of the work W is mounted on the lower side 17b of the fitting recess 17 through the cut 21 of the clamp body 12, the clamp body 12 moves up and down while the lower side 17b is in contact with the edge of the work W. The position is automatically adjusted to the height of the work W (see FIG. 6A). Next, the main clamping device 4,
5 and 6, the work W is fixed. Then, when the clamp body 12 is rotated by grasping the operation portion 13a of each clamp device 10, the edge of the work W is automatically clamped in the fitting recess 17. When the clamp body 12 is further rotated until it stops (see FIG. 6 (2)), the fitting recess 17 presses the edge of the work W by its cam-shaped outer peripheral shape, and the upper side of the fitting recess 17. The edge of the work W is pressed against the upper and lower two points 17a and 17b (see FIG. 6C). At this time, even if the edge of the workpiece W is not vertical but slightly oblique,
At the position where the fitting recess 17 abuts on the work W, the work W is fixed to the upper and lower two points, so that the work W is firmly fixed. Thereafter, the operation unit 13a of each clamp body 12 is rotated,
By tightening the thumb screw 13 to the support shaft 11, each clamp body 12 is locked and the fixing operation is completed. Therefore, the operation of performing predetermined processing on the work W by the milling machine is started.

When the work W is to be removed after a predetermined machining operation by the milling machine, the lock of the thumb screw 13 is released by the operation section 13a of each clamp device 10, and each clamp body 12 is turned in the opposite direction to the above-described tightening direction. To separate the fitting recess 17 from the edge of the work W,
Is positioned at the edge of the work W (see FIGS. 6 (3) to (1)).
Then, if the work W is lifted after the main clamp devices 4, 5, 6 are disengaged, the work W can be removed as it is because the upper end of the work W is opened by the cut portion 21.

Next, referring to FIG.
The difference is that the clamp body 32 has the same structure except that the clamp body 12 of the clamp device 10 is turned upside down and the cut portion 31 is partially changed in connection with that. , The same members are denoted by the same reference numerals and description thereof will be omitted. That is, since the upper side 37a and the lower side 37b of the fitting recess 37 are vertically inverted with respect to the upper side 17a and the lower side 17b of the fitting recess 17 of the clamp body 12, the upper side 37a (the lower side 17b of the fitting recess 17).
Is cut off to form a cut portion 31. According to the clamp device 30, the boss 32 a of the clamp body 32 is located below and the upper part is opened, so that the processing tool 40 of the milling machine can approach the clamp body 32 without interfering. Therefore,
When the vicinity of the edge of the work W is processed by the processing tool, a clamp device 30 is provided instead of the clamp device 10.

In the above-described embodiment, the clamp device 10 or 30 has been described as an auxiliary device for the main clamp devices 4, 5, and 6. However, in a processing machine that does not require a very strong fixing force, the present invention is not limited to this. Clamping device 1
It is also possible to substitute the main clamping device by arranging three or four 0s or 30s. The substantially V-shape of the fitting recess has been described as a trapezoidal groove, but it may be a V-shaped groove. In other words, any shape may be used as long as the edge of the work W is pressed against at least two points at the top and bottom. Further, in the embodiment, the case where the thumb screw is used as the lock member has been described. However, it is a matter of course that other configurations such as a one-touch type lever structure may be used.

[0021]

According to the first aspect of the present invention, even if the workpiece (work) is somewhat uneven, the edge of the workpiece can be fixed by the fitting recess of the clamp body. It is not necessary to separately adjust the height of the upper and lower clamp members unlike the method of tightening the upper and lower sides of the material, and it is possible to adjust the position in the front-rear direction to advance and retreat to the workpiece by rotating the eccentric clamp body. . That is, the height of the clamp body and the position adjustment in the front-rear direction can be performed simultaneously, thereby facilitating the clamp operation. Moreover, since the constituent members are configured as a single part without being separated, the handling is simple. According to the second aspect, the workpiece can be detached through the cut portion of the fitting recess, and the height position of the clamp body can be easily adjusted by the lower piece of the fitting recess. The clamp body is urged upward by a spring member, so that the lower side of the fitting recess automatically comes into contact with the edge of the workpiece, so that the height position of the clamp body is set to the loading of the workpiece. The adjustment is automatically performed according to (claim 3).

According to the fourth aspect, the clamp body can be simultaneously adjusted in the height direction and the front-rear direction by moving the clamp body by grasping the operating portion of the lock member,
Moreover, by operating the operation unit after the position adjustment, the clamp body can be quickly locked, and the operability is further simplified. Further, according to the fifth aspect, in addition to the main clamping device, the clamping device is used as a clamping device for assisting a range portion of the work material having a small fixing action. The work material fixing range can be expanded beyond the fixing range S by the main clamping device described above, and the work material can be reliably fixed, and therefore, the processing accuracy such as the flatness of planar processing and the perpendicularity of drilling is improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a mounting board (working table) provided with a clamp device of the present invention.

FIG. 2 is a sectional view taken along the line (2)-(2) of FIG.

FIG. 3 is a sectional view taken along the line (3)-(3).

FIG. 4 is a perspective view of the clamp device of the present invention.

FIG. 5 is a sectional plan view showing a lock portion of the same device.

FIG. 6 is a plan view and a front view showing a fixing operation of the same device.

FIG. 7 is a front view illustrating another embodiment of the device.

[Explanation of symbols]

1: Mounting board
2,3: Positioning table W: Workpiece (work) 4,5
6: Main clamp device 10: Clamp device 11: Support shaft
12: Clamp body 12a: Boss 13: Thumbscrew (locking member) 13a: Operating part 14: Spring 17: Fitting recess
17a: Upper side 17b: Lower side 21: Cut section 30: Clamping device 31: Cut section
32: clamp body 37: fitting recess 37a: upper side
37b: lower side

Continuation of the front page (72) Inventor Jun Naito 5-13-12 Kugahara, Ota-ku, Tokyo F-term (reference) Teraoka Seiko Co., Ltd. 3C016 CA07 CB02 CB14 CD01 CE05

Claims (5)

[Claims] A clamp body is eccentrically rotated and vertically movable on a support shaft erected on a mounting board, and the clamp body is rotated at a predetermined position of the support shaft and vertically immovable. A lock member for fixing is provided, and the clamp body includes:
A workpiece clamping device which is substantially circular in plan view and has a substantially V-shaped fitting recess over a part or the entire circumference of the outer peripheral surface, and the fitting recess is fitted into an edge of the workpiece and tightened. . 2. The clamp body has a shape in which an upper side of the fitting concave portion is cut off in a predetermined range of an outer peripheral portion on a shorter side with respect to a support shaft, and a workpiece is clamped through the cut portion. 2. The clamp device according to claim 1, wherein the clamp device is mounted on or removed from a lower side of the fitting recess. 3. The clamp device according to claim 1, wherein the clamp body is urged upward by a spring member. 4. A boss portion for penetrating the support shaft is formed integrally with the clamp body, and a lock member is screwed to the boss portion and can advance and retreat in a direction substantially orthogonal to the support shaft. The clamping device according to any one of claims 1 to 3, further comprising: an operating portion provided at an outer end of the lock shaft. 5. The work material is fixed at three points on both upper and lower sides by a main clamp device disposed at a fixed position, and the clamp body is disposed at a position where the acting force of fixing by the main clamp device is small. The clamping device according to claim 1, wherein the clamping is performed.