JPH068085A - Suction type fixing device - Google Patents

Abstract

PURPOSE:To provide a suction type fixing device desirable in the vacuum sealing performance of a workpiece placing face, large in the coefficient of friction so as to be excellent in workpiece fixing performance and capable of obtaining strong fixing force even to thrust load. CONSTITUTION:The top plate 1 of a suction box is provided with a resin layer 7 formed by burning polyurethane elastomer, and the suction box A is provided at one side or two sides thereof with a stopper 10 brought into close contact with the end face of a workpiece B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction type fixing device for holding a work set on a machine tool.

[0002]

2. Description of the Related Art When a work is machined with a machine tool, it is usually clamped with a machine vise, but if the machine vise is strongly tightened, the work is distorted. As a device for eliminating this drawback, there is a suction type fixing device.

In this suction type fixing device, the work is pressed against the top plate by the differential pressure from the atmospheric pressure by evacuating the inside of a hollow suction box in which the top plate is provided with suction ports consisting of a large number of holes or slits. Then, it is designed to be clamped.

[0004]

The top plate of the suction box as described above is made of iron or aluminum, but when the work itself is distorted,
There is a drawback that minute gaps occur and the adsorption force decreases.

Further, when the metal top plate and the metal work are in direct contact with each other, the coefficient of friction is small, so that they are not suitable for a large thrust load, and their use is limited to light load grinding.

Further, in machining, a grinding fluid or a cutting fluid is used, but a large-capacity drain device is required to prevent the machining fluid from being sucked from the minute gap to adversely affect the vacuum pump. And

Therefore, an object of the present invention is to provide a device which has a good vacuum sealability, a large friction coefficient and an excellent workability, and which does not damage the work and yet has a strong fixing force against a thrust load. Is to provide.

[0008]

In order to solve the above problems, in the present invention, the top plate of the suction box is formed by providing a resin layer on which a polyurethane elastomer is baked on the upper surface of the metal substrate.

Further, according to the present invention, a stopper projecting above the top plate is provided on one side or two sides orthogonal to each other of the rectangular suction box, and the suction box is installed so that the stopper abuts around the work. I did.

[0010]

The above-mentioned resin layer is excellent in abrasion resistance and has elasticity to some extent, so that the resin layer has good adhesion to the work and the vacuum sealability can be enhanced.

Further, a work which is easily scratched such as an aluminum plate is not damaged.

Furthermore, since the coefficient of friction is large, the workability is excellent.

Further, by bringing the stopper of the suction box into contact with the periphery of the work, the work is prevented from being displaced, and a strong fixing force can be obtained against the thrust load in the X-axis or Y-axis direction.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the suction box A comprises a top plate 1 of an upper block and a lower block 2, and a hollow portion 3 is provided in the lower block 2 for connecting a suction hose. A pipe port 4 is provided so as to communicate with the hollow portion 3. The top plate 1 is provided with a suction port 5 having a large number of holes. Of course, instead of this hole, a suction port such as a slit may be provided. When the top plate 1 is placed on and fixed to the lower block 2, a suction box is completed. At this time, the seal ring 8 maintains the airtightness of the top plate 1 and the lower block 2.

As shown in FIG. 2, the top plate 1 has a resin layer 7 formed by baking a polyurethane elastomer (for example, HYNEK-UC-200, Nippon Elastomer Development Co., Ltd.) on a substrate 6 made of iron or aluminum. It is provided.

The firing conditions are preferably about 100 ° C. for about 12 hours, and the thickness is preferably about 1 to 2 mm.

The resin layer 7 is subjected to polishing finish after baking.

FIG. 3 shows a suction box having a slit and an integral suction box. The suction port 5 communicates with the hollow passage 9, and the passage 9 is evacuated through the piping port 4. Of course, the resin layer 7 is the same as above.

Next, in the suction box A shown in FIG. 4, a stopper 10 protruding above the top plate 1 is attached to one side of the rectangle. The height of the stopper 10 is set to be slightly lower than the finished size of the work B.

When setting the work B, the suction box A provided with the stopper 10 on one side of the rectangle is fixed so that one side of the work B is in close contact with the stopper 10, as shown in FIG. This can prevent the work B from being displaced in one direction. When the work B is small and the suction port 5 of the top plate 1 is exposed, the suction port 5 is closed by a seal plate 11 formed of rubber or the like.

Further, two suction boxes A shown in FIG. 4 are used, and as shown in FIG.
When the stoppers 10 are set so as to be in close contact with each other, the work B can be fixed so as not to be displaced in both the left and right directions, that is, the + direction and the-direction of the X axis.

Next, in the suction box A shown in FIG. 8, stoppers 10 projecting above the top plate 1 are attached to two sides of the rectangle which are orthogonal to each other. The height of the stopper 10 is also set to be slightly lower than the finished size of the work B, like the stopper 10 shown in FIG.

When the work B is set in the suction box A provided with the stopper 10 as shown in FIG. 9, the two sides of the rectangle are fixed so that the right angle stopper 10 is closely attached to one corner of the work B. To do. By this, X
It is possible to prevent the work B from being displaced in one direction of the axis and one direction of the Y axis.

If two suction boxes A shown in FIG. 8 are used and the right-angled stoppers 10 are set so as to be in close contact with the diagonal corners of the work B as shown in FIG. Can be fixed so as not to shift in either the X-axis or Y-axis direction.

Furthermore, even if four suction boxes A shown in FIG. 8 are used and the right angle stoppers 10 are set in close contact with the corners of the work B as shown in FIG. It can be fixed so as not to be displaced in either the X axis or the Y axis.

Incidentally, in FIG. 6, FIG. 10 and FIG.
Reference numeral 12 is a bed of the processing machine, 13 is a clamp for fixing the suction box A to the bed 12, 14 is a suction hose, and 15
Indicates a vacuum degree checker.

[0028]

According to the present invention, as described above, since the resin layer made of polyurethane elastomer is provided on the top plate of the suction box, it protects both the work and the top plate to prevent damage, and Since the surface of the top plate is excellent in smoothness and has a certain degree of elasticity, the vacuum sealing property is enhanced, the suction force can be increased, and the cutting oil can be used.

Further, since the friction coefficient is large, the work does not slip and the fixing property is excellent, and many other effects can be obtained.

Further, since the suction box A is provided with a stopper so that the thrust load applied to the work can be received by the stopper, a strong fixing force can be obtained against the thrust load and the thrust in the X-axis and Y-axis directions can be obtained. There is also an effect that it can be used for milling where a load is applied.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a suction box of the present invention.

FIG. 2 is a partially enlarged sectional view showing the top plate of the same.

FIG. 3 is a perspective view showing another embodiment of the suction box of the present invention.

FIG. 4 is a perspective view showing an embodiment of a suction box of the present invention provided with a stopper.

5 is a plan view showing an example of a usage state of the suction box of FIG.

FIG. 6 is a plan view showing a state in which a work is fixed by using the two suction boxes in FIG.

FIG. 7 is a front view of FIG.

FIG. 8 is a perspective view of another embodiment of the suction box of the present invention provided with a stopper.

FIG. 9 is a plan view showing an example of a usage state of the suction box of FIG.

FIG. 10 is a plan view showing a state in which a work is fixed by using two suction boxes in FIG.

FIG. 11 is a plan view showing a state in which a work is fixed using four suction boxes in FIG.

[Explanation of symbols]

 A suction box B work 1 top plate 2 lower block 3 hollow part 5 suction port 6 substrate 7 resin layer 10 stopper

Claims (6)

[Claims] 1. A suction type fixing device having a suction box having a large number of suction ports on the upper surface thereof, wherein a top plate of the suction box is composed of a metal substrate and a resin layer formed by firing a polyurethane elastomer on the upper surface thereof. A suction-type fixing device. 2. The suction-type fixing device according to claim 1, wherein a top plate of the suction box is formed in a rectangular shape, and a stopper protruding above the top plate is provided on one side thereof. 3. The suction type fixing device according to claim 1, wherein a top plate of the suction box is formed in a rectangular shape, and stoppers projecting above the top plate are provided on two sides orthogonal to each other. 4. A suction-type fixing device, wherein two suction boxes according to claim 2 are installed so as to face each other so that works can be clamped by respective stoppers. 5. The two suction boxes according to claim 3, wherein stoppers provided on two orthogonal sides of each suction box are installed so as to hold diagonal corner portions of a rectangular work. Characteristic suction type fixing device. 6. The four suction boxes according to claim 3, wherein stoppers provided on two orthogonal sides of each suction box are installed so as to hold four corners of a rectangular work. Suction type fixing device.