JPH09117835A - Work fixing jig of polishing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a work at a prescribed position of a polishing machine even when the shape of the work changes. SOLUTION: A work 1 to be polished is supported by a reference side jig 21 and a clamp side jig 22, but these reference side jig 21 and clamp side jig 22 are respectively supported turnably by support shafts 28, 29 on a central line 27 and have tow each of L shaped brackets 25, 25', 26, 26' symmetrically arranged against the central line 27. Each of the brackets 25, 25', 26, 26' has movable supporting points 25a, 25b, 25a', 25b', 26a, 26b, 26a', 26b' to turn around the support shafts 28, 29 as their center in the neighborhood of both ends, and the work 1 is fixed after it is guided at a prescribed position of a polishing machine at the eight movable supporting points in total.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to positioning of a work on a polishing machine, and more particularly, even if the shape of the work to be polished changes due to setup change or the like, the work can be fixed at a predetermined position on the polishing machine without replacement. Regarding the fixture.

[0002]

2. Description of the Related Art A sink used in a kitchen or the like is formed by welding a bowl formed by deep drawing a thin stainless plate and a top plate formed by punching and bending the same thin stainless plate with a press. Then, the welded part is polished by a polishing machine to finish.

In the above-mentioned polishing work, since the portion to be polished is long and has a complicated shape, the polishing head can be moved in the horizontal and vertical two-axis directions and can be rotated about the vertical axis. A polishing machine is used which allows the angle of the head to be changed, and has three axes NC controlled by a computer or the like. Further, since it is necessary to change the polishing belt for polishing such as rough, medium and finish, a plurality of polishing machines for roughing to finishing are arranged in a line, and the works are fed in order. By passing through two lines, it is possible to consistently perform from rough to finish.

FIGS. 5A and 5B are views showing a conventional example of a work fixing jig used in such a polishing machine.
The work fixing jig shown in the figure is provided with reference side jigs 2 and 3 provided on the upper right and lower sides of the work 1 in the figure, clamp side jigs 4 and 5 provided on the left upper and lower sides, and an intermediate portion between these. It is composed of the side jigs 6 and 7.

The work 1 is formed by welding a stainless steel thin plate to a bowl 1a formed by deep drawing of a press, and a top plate 1b formed by punching and bending the stainless thin plate at a welding portion 1c around the bowl. Formed,
The beads and steps formed by welding are smoothly polished by a polishing machine to finish the product.

Reference side jigs 2, 3 and side side jigs 6, 7
Are vertically symmetrical shapes, and the surface 2 that contacts the work 1
The a, 3a and 6a, 7a are formed in the same shape as the shape of the abutting portion of the work 1. Clamp side jig 4,
The contact surfaces 4a, 5a of the plate 5 are flat surfaces and contact the work 1 at points or lines.

The reference side jigs 2 and 3 are provided on the bed of the polishing machine, and the side side jigs 6 and 7 and the clamp side jig 4 are provided.
Reference numeral 5 is movable in the arrow direction by a driving device (not shown).

With the clamp side jigs 4, 5 and the side jigs 6, 7 moved in a direction away from the work 1, the work 1 to be polished is inserted from above in FIG. The jigs 6 and 7 and the clamp side jigs 4 and 5 approach each other, and the work 1 is clamped at a predetermined position. Then, the polishing belt 8 polishes the welded portion 1c as the center.

[0009]

However, in the work fixing jig of the conventional polishing machine described above, the reference side jig 2,
Since the 3 and the side jigs 6 and 7 have contact surfaces that match the shape of the work 1, when performing a setup change to a work of a different shape, the work that matches the shape of the new work should be performed. Must be replaced with a jig that has a mating surface. For example, in the case of the conventional example shown in FIG. 5, at least 4 of the reference side jigs 2 and 3 and the side side jigs 6 and 7, and in some cases, 6 including the clamp side jigs 4 and 5, are replaced. However, since about 4 polishing machines are used for roughing to finishing, one jig has to be replaced with 4 to 6 jigs for all of these polishing machines. Therefore, the number of jigs to be replaced is large, and it takes a very long time to replace them. Moreover, since many jigs are handled, there is a possibility that the jigs will be mistaken.

As described above, 16 per work piece
Therefore, as many as 24 jigs are required, and if there are many kinds of workpieces, it is naturally necessary to prepare so many kinds of jigs. And since jigs cannot be mass-produced and are handmade,
The unit price was high, and it was expensive because many expensive jigs had to be prepared, and it was difficult to manage the inventory of a huge number of jigs.

However, recently, there has been a demand for a random flow in which works of various shapes are flowed at random. On the other hand, moving the polishing head of the polishing machine according to the shape of the workpiece can be relatively easily handled by changing the NC control program, but positioning of the workpiece is not possible with the conventional workpiece fixing jig. I couldn't handle it.

The present invention has been made in view of the above facts, and an object thereof is to provide a work fixing jig for a polishing machine which can fix the work at a predetermined position of the polishing machine even if the shape of the work is changed. There is.

[0013]

In order to achieve the above object, the present invention provides a reference side jig for supporting one side of a work to be polished and a clamp side jig for supporting the other side of the work. At least one of the reference side jig and the clamp side jig has a plurality of movable supporting points, and when the clamp side jig clamps the workpiece, the workpiece is polished by the plurality of movable supporting points. It is characterized by being able to guide and fix it in place on the machine.

Alternatively, it has a reference side jig for supporting one side of the work to be polished and a clamp side jig for supporting the other side of the work, and either the reference side jig or the clamp side jig is provided. Has two brackets that are rotatably supported by a support shaft and are symmetrically arranged, and two movable support points, two brackets formed on both sides of the support shaft on each bracket, for a total of four movable support points. Either the reference side jig or the clamp side jig has one or more supporting points for supporting the other side of the work, and the reference side jig and the clamp side jig hold the work, Alternatively, the polishing machine may be provided so as to be relatively movable.

Further, one of the above-mentioned other jigs has the same construction as the above-mentioned one of the above-mentioned jigs, and both jigs each have four movable support points, and a work is carried out at a total of eight movable support points. It may be configured to guide and fix it at a predetermined position.

In any one of the above-mentioned configurations, it is desirable to have a configuration in which a switching drive device that greatly changes the distance between the reference side jig and the clamp side jig and a clamp device that changes the distance slightly.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view of a polishing machine to which the work fixing jig of the present invention is attached. As shown in FIG.
Place the X-axis table 12 on the center column 11,
Attach the Y-axis table 13 to the X-axis table 12,
The polishing head 14 is suspended in the Z-axis direction from the Y-axis table 13 so that the polishing head 14 can freely move in the X- and Y-axis directions.

The polishing head 14 has an endless polishing belt 15. The polishing belt 15 is wound around a contact pulley 16, a drive pulley 17, and a tension pulley 18, and is rotated by a drive pulley 17, and is tensioned by a tension pulley 18. Is adjusted.

The polishing head 14 can be further rotated around the Z axis, and the head can be swung around the point where the contact pulley contacts the work. With the above configuration, it is possible to polish any part of the work 1 at any angle. The control of the polishing head 14 is controlled by a computer or the like in a control box 19 placed near the polishing machine.

That is, in the control box 19, the shape and size of the work 1 is known from the work fixing jig, and the work head 1 is operated by operating the polishing head 14 according to a program preset to match the shape. .

A plurality of such polishing machines are arranged, and polishing processing is sequentially performed from the roughening step to the final finishing step.

The work fixing jig of the present invention is shown in FIGS.
As shown in, the reference side jig 21 and the clamp side jig 22
Consists of The reference side jig 21 is fixed to the main body of the polishing machine 10, the clamp side jig 22 is fixed to the switching drive device 23, and the switching drive device 23 itself is a clamp device 24.
It is fixed to. The clamp device 24 is fixed to the main body of the polishing machine 10.

FIG. 2 is a view showing a detailed structure of the work fixing jig. The figure (a) shows the state before the work 1 is clamped, and the figure (b) shows the clamped state. As shown in these drawings, both the reference side jig 21 and the clamp side jig 22 are L-shaped brackets 25, 25 ', 2
6, 26 ′ are rotatably supported by supporting shafts 28, 29 on the center line 27.

The brackets 25, 25 'are symmetrical with respect to the center line 27 and have support points 25a, 25b, 25a', 25b 'for positioning the work 1 near both ends of the L shape. The support points 25a and 25b are attached to the brackets 25 and 25 '.
Since it moves with the rotation of, it is called a movable support point.
Further, in the vicinity of the bracket 25, the rotation stopping bracket 3
0, which is provided with a stopper 30a using a bolt and a coil spring 30b. That is, FIG.
In (a), the upper right bracket 25 in the figure is biased by the coil spring 30b so as to rotate clockwise, and is blocked by the stopper 30a. The lower right bracket 25 'is biased counterclockwise by the coil spring 30b and is blocked by the stopper 30a.

Similarly, the brackets 26 and 26 'also have the center line 2
It has an L-shape symmetrical to 7, and has movable supporting points 26a, 26b, 26a ', 26b' for positioning the work 1 in the vicinity of both ends, and the middle of these is rotatably supported by a spindle 29. There is. Further, like the bracket 25, there is a rotation stopping bracket 30, the upper bracket 26 is blocked from rotating counterclockwise, and the lower bracket 26 'is blocked from rotating clockwise.

As shown in FIG. 3, the reference side jig 21 and the clamp side jig 22 having the above-described structure are moved by the switching drive device 23 and the clamp side jig 22 is largely moved.
The clamp device 24 moves the clamp-side jig 22 in a small amount to clamp the work 1 in response to the change in the shape. As the switching drive device 23, a pneumatic cylinder or the like is used, and in particular, a device having a large stroke is used.

Next, the operation of the above embodiment will be described. FIG.
As shown in (a), when the clamp device 24 moves the clamp side jig 22 away from the reference jig 21, it becomes an unclamped state, and each of the eight movable support points 25a, 2
5b, 25a ', 25b', 26a, 26b, 26
a 'and 26b' are separated from the work 1. The line 31 indicates the center position between the reference jig 21 and the clamp jig 22 at this time. In this state, the work 1 is inserted into the jig.

After that, the clamp device 24 operates to bring the clamp side jig 22 closer to the reference side jig 21. When the clamp side jig 22 starts moving, first, the eight support points 2
5a, 25b, 25a ', 25b', 26a, 26b,
Of 26a 'and 26b', 25b and 2 on the center line 27 side
Four of 5b ', 26b and 26b' contact the left and right ends of the work 1. When the clamp side jig 22 continues to move, the movable supporting points 25b, 25b ', 26b, 26b' are pushed by the work 1, and 25b, 25b 'are moved to the right side of the drawing by 2
6b, 26b 'move to the left, and the brackets 25, 25' 26, 26 'rotate accordingly and the supporting points 25a, 26b'
25a ', 26a, and 26a' come into close contact with the work 1 from above and below in the drawing. After the support side 4 of the reference side jig 21 and the support side 4 of the clamp side jig 22 contact a total of 8 points, the clamp side jig 22 is still in the reference side jig 21.
2 and the movement of the distance s between the line 31 in FIG. 2A and the line 32 in FIG. 2B is completed, the eight movable support points are pressed against the work 1 to Hold firmly and stop.

Since the brackets 25, 25 ', 26, 26' have symmetrical shapes and are arranged symmetrically with respect to the center line 27, four movable support points 25a, 25b, 25a ', 25 are provided.
b'and 26a, 26b, 26a ', 26b' can always guide and fix the work 1 to a predetermined position of the polishing machine 10.

Further, L-shaped brackets 25, 25 ', 2
6 and 26 'are two movable support points 25a and 25, respectively.
b, 25a ', 25b', 26a, 26b, 26a ',
Since it contacts the work 1 at 26b ', the bracket 25,
The work 1 can be positioned and gripped at a predetermined position without being influenced by the shapes of 25 ', 26, 26'.

Even if the work 1 is switched to one having a different shape, the movable supporting points 25a, 25b, 25a ', 25b', 26a, 2 of the brackets 25, 25 ', 26, 26' are formed.
By moving 6b, 26a 'and 26b' according to the difference in shape, the work can be fixed at a fixed position with respect to the polishing machine 10 at all times.

When the specifications of the work 1 change due to a setup change or the like, and the length of the work 1 changes significantly, if the position of the clamping jig 22 is moved in advance by the switching drive device 23, the clamping time will be increased. It gets shorter.

FIG. 4 shows another embodiment of the present invention. In this embodiment, only the reference-side jig 21 has the same structure as that of the above-described embodiment, and the clamp-side jig 35 is a single non-movable support point. Even with such a configuration, the work 1 can be positioned only by the four movable support points of the reference jig 21. Further, in this embodiment, the clamp side jig 35
Was used as a single support point, but it may be supported at two or more points,
Further, the clamp side jig and the reference side jig are interchanged, that is, the clamp side jig has four movable support points shown in FIG. 2, and the reference side has a single or two or more support points. It may be configured.

[0034]

As described above, according to the present invention, since the work fixing jig supports the work at the movable support points and guides and positions it at a predetermined position, even if the shape of the work changes, The work can be gripped and fixed at a fixed position. Therefore, the types of jigs can be significantly reduced. Further, it is possible to eliminate the jig setup change time due to the change of the work. Further, since it is no longer necessary to replace the jig, it is possible to support a random flow.

Further, if the switching drive device capable of largely changing the distance between the reference jig and the clamp jig is provided, the stroke of the clamp device can be small, and the clamp operation can be speeded up. become.

[Brief description of the drawings]

FIG. 1 is a front view of a polishing machine provided with a workpiece fixing jig of the present invention.

2A and 2B are top views showing the structure of a work fixing jig of the present invention, where FIG. 2A is a state before clamping and FIG. 2B is a diagram showing a clamped state.

FIG. 3 is a side view showing a configuration of a work fixing jig of the present invention.

FIG. 4 is a top view showing another embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional work fixing jig (a).
Is a top view and (b) is a BB cross-sectional view of (a).

[Explanation of symbols]

1 Work 10 Polishing Machine 21 Reference Side Jig 22 Clamp Side Jig 23 Switching Drive Device 24 Clamping Device 25, 26 Bracket 25a, 25b, 26a, 26b Movable Support Point 25a ', 25b', 26a ', 26b' Movable Support Point 28, 29 Spindle 27 Center line 35 Support point

Claims (4)

[Claims] 1. A reference side jig that supports one side of a work to be polished, and a clamp side jig that supports the other side of the work, and at least one of the reference side jig and the clamp side jig. One of them has a plurality of movable supporting points, and when the clamp side jig clamps the work, the plurality of movable supporting points can guide and fix the work at a predetermined position of the polishing machine. Workpiece fixing jig. 2. A reference-side jig that supports one side of a work to be polished, and a clamp-side jig that supports the other side of the work, and either one of the reference-side jig and the clamp-side jig is provided. Has two brackets that are rotatably supported by the support shaft and are symmetrically arranged, and two movable support points, two on each side of the support shaft on each bracket, for a total of four movable support points, Either the reference side jig or the clamp side jig has one or more supporting points for supporting the other side of the work, and the reference side jig and the clamp side jig hold the work, A workpiece fixing jig for a polishing machine, which is provided on the polishing machine so as to be relatively movable. 3. The jig on the other side has the same structure as the jig on the one side, and both jigs have four movable support points, respectively, and a work is carried out by a total of eight movable support points. The work fixing jig for a polishing machine according to claim 2, wherein the jig is guided and fixed at a predetermined position. 4. The work fixing jig of the polishing machine according to claim 1, wherein the work fixing jig is changed to a small amount, and the change driving device is used to greatly change the distance between the reference jig and the clamp jig. A jig for fixing a work of a polishing machine, comprising: