JPH0229454B2 - YOKOGATAMASHININGUSENTAYOWAAKUKURANPUSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a work clamp device that holds workpieces to be machined in a horizontal machining center in a plurality of upper and lower stages.

≪Prior Art≫ Conventionally, as a work clamp device that holds workpieces in multiple stages above and below, for example, Catalog No. MC- published by Nabeya Co., Ltd. on November 1, 1980
There is one described in 162-82A.

As shown in FIG. 5, a plurality of clamp devices 54 consisting of a reference block 53 and a pressing block 53 are fixed to each surface of a center block 51 erected from a base plate 50 in upper and lower stages. By holding the workpieces 55 at the center block 51, a plurality of workpieces 5
I am trying to fix 5.

<<Problems to be Solved>> In the conventional work clamping device, a plurality of pairs of reference blocks 52 and pressing blocks 53 are arranged one above the other on each surface of the center block 51, so that there is no gap between the upper and lower workpieces. Pressing block 53
and the reference block 52 located above it, and the pitch at which the workpiece 55 is disposed becomes larger. However, since the work mounting range in the center block is regulated by the amount of tool movement of the machining center, it has not been possible to increase the number of workpieces mounted on one surface of the center block in the conventional example described above.

Further, in the conventional example in which the reference block 52 and the pressing block 53 are paired, the tightening force when tightening and fixing the workpiece acts on the reference block 52, and the tightening reaction force acts on the pressing block 53. ,
The reference block 52 and the pressing block 53 were deformed into a shape that spread toward the front, and the work reference position was sometimes misaligned.

Furthermore, a reference block 52 and a pressing block 53
The reference block 5 is fixed to each side of the center block 51 as a pair.
2 to each surface of the center block 51 with high precision, the machining reference positions on each surface of the center block 51 would be different, resulting in a problem that the machining accuracy would be reduced.

<Means for Solving the Problems> The present invention provides a clamping device that can increase the number of workpieces to be fixed in the height direction and accurately determine the work reference position for each workpiece. Pressing blocks having at least one pair of arm members protruding in opposite directions on a base plate and a short columnar center block are alternately arranged in multiple upper and lower stages, and a pressing clamp tool is attached to the lower surface of the arm portion of the pressing block. In addition, the upper surface of the arm portion of the pressing block is formed as a workpiece mounting surface.

<<Function>> In the present invention, since the upper surface of the arm part of the pressing block is formed as the workpiece mounting surface, the tightening reaction force that acts on the pressing block when the workpiece is fixed is applied to the workpiece placed on the upper surface of the pressing block. The pressure block is balanced with the tightening force from the pressure block located above it, so the pressure block does not deform.
The work reference position can be held accurately.

Furthermore, since the upper surface of the arm portion of the pressing block is used as the workpiece mounting surface, the reference block can be omitted and a large number of workpieces can be fixed on one surface.

Furthermore, since the upper and lower surfaces of the pressing block and center block can be finished by flat processing, the height of each clamping surface can be set accurately.

<<Example>> Fig. 1 is a front view of a work pallet, Fig. 2 is a plan view, Fig. 3 is a perspective view taken out of the main part, and Fig. 4 is a longitudinal sectional view of the main part.

In the figure, 1 is a base plate that is removably fixed on the turning table of a horizontal machining center, and 2
3 is a center block formed in the shape of a short column, and 3 is a pressing block formed on a cross plate.

The short columnar center block 2 is formed into a substantially octagonal column as shown in FIG. is transparent.

On the other hand, the cross plate-shaped pressing block 3 is formed of a center plate portion 6 formed in the same shape as the center block 2 and arm members 7 integrally extending from the center plate portion 6 in all directions. Corresponding to the block 2, a pressure oil passage 8 and a bolt insertion hole 9 are provided vertically through the block 2.

A key groove 10 is formed in each abutting surface of the cross plate-shaped press block 3 and the short column-shaped center block 2, so that each arm member 7 of the press block 3 can be centered in a state where they overlap each other in a plan view. With the blocks 2 and pressing blocks 3 alternately stacked one on top of the other, and the center block 2 and pressing block 3 positioned using the key 11 placed in the keyway 10, firmly fix them to the base plate 1 with the through bolts 12. There is.

Two hydraulic cylinders 13 are arranged downward in the arm member 7 of the press block 3 in a lined up direction in the protruding direction of the arm member 7, and an oil guide path 14 for supplying pressure oil to the hydraulic cylinders 13 is connected to the arm member. 7 is transparent. This oil guide passage 14 communicates with a pressure oil passage 8 formed in the central plate portion 6 of the pressing block 3. Further, the upper surface 15 of the arm member 7 of each pressing block 3 is formed on the surface on which the workpiece W is placed.

In the figure, reference numeral 16 indicates a pressure oil supply/discharge switching valve fixed to the upper surface of the center plate portion 6 of the pressing block 3 located at the top, and 17 indicates a leveling block.

In the work clamp device with the above configuration,
A workpiece W is placed on the upper surface 15 of the arm member of the lower pressing block 3.
is placed, and the hydraulic cylinder 13 of the upper pressing block 3 located above the workpiece W is actuated downward to fix the workpiece W in a plurality of upper and lower stages. In this case, the reaction force of the clamping force by the hydraulic cylinder 13 acts upward on the pressing block 3, but the clamping force from the upper pressing block 3 is transmitted to the arm upper surface 15 of the pressing block 3 via the workpiece W. It turns out.
Since this clamping force and clamping reaction force are almost balanced, each pressing block 3 will not be deformed, and the distance between the upper surface 15 of each pressing block 3 and the upper surface of the base plate 1 will not change even after clamping. .
Thereby, the upper surface 15 of each press block 3 becomes a stable machining reference surface. However, since no clamping force counteracting the clamping reaction force acts on the pressing block 3 located at the uppermost side, the workpiece W is deformed upward by the clamping reaction force, but the workpiece W fixed by the uppermost pressing block 3 Since the machining reference plane is the upper surface of the lower pressing block 3, accurate machining can be performed without any problems.

In the above embodiment, the pressing block 3 is formed in a cross shape, but it may be formed in a shape in which the arm members 7 protrude in six directions, or in a shape in which the arm members 7 protrude in two opposite directions.

Further, in the above embodiment, the pressure block 3 is provided with a hydraulic cylinder 13 to form a pressure clamp tool, but the pressure block 3 may be provided with a mechanical clamper to form a clamp tool. In this case, it is necessary to equalize the tightening force of each clamper.

<<Effects>> As described above, in the present invention, the short columnar center blocks and the pressing blocks whose arm members protrude in opposite directions are stacked alternately to position the workpiece holding section in multiple upper and lower stages. Since the clamping tool is positioned on the lower surface of the arm member of the pressing block, and the upper surface of the arm portion of the pressing block is formed as the workpiece mounting surface, only the pressing block is located between the workpieces fixed in multiple stages above and below. Therefore, the fixed pitch between the works can be formed small. As a result, it is possible to increase the number of workpieces arranged per surface, and the machining center can be operated continuously for a long time with one set-up.

Furthermore, since the upper surface of the press block is formed as the workpiece mounting surface, the clamping reaction force and the clamping force from the upper clamp tool are balanced when the workpiece is fixed, and the press block will not be deformed. , the machining reference plane will not be displaced due to the fixation of the workpiece.
Thereby, the processing accuracy of the product can be increased.

In addition, since the clamping device uses only the pressure block, the structure of the clamping device can be simplified, and since no tightening reaction force acts on the pressure block, the pressure block itself does not require strength. , the structure can be further simplified.

Moreover, since the clamping device is constructed by stacking and fixing the short column-shaped center block and the pressing blocks whose arm members protrude in opposite directions alternately, the clamping device can be secured on the upper and lower surfaces of the center block or on the pressing block. Since the lower surface can be formed with high accuracy by plane processing, the upper surfaces of the pressing blocks in each layer are located in the same plane, and the height of the processing reference plane on each surface of the center block can be set with high precision. .

Furthermore, since the clamping device is formed by stacking short columnar center blocks and pressing blocks alternately, by using center blocks of different lengths, the clamping device can be easily adapted to workpieces of different heights. Can be recombined.

[Brief explanation of drawings]

FIG. 1 is a front view of a work pallet, FIG. 2 is a plan view of the work pallet, FIG. 3 is a perspective view taken out of a main part, FIG. 4 is a vertical sectional view of a main part, and FIG. 5 is a front view of a conventional example. DESCRIPTION OF SYMBOLS 1...Base plate, 2...Short columnar center block, 3...Press block, 7...3 arm member, 13...Press clamp tool, 15...Arm part upper surface.

Claims (1)

[Claims] 1 Pressing blocks 3 each having at least a pair of arm members 7 opposed to each other and protruding from a base plate 1 and short column-shaped center blocks 2 are arranged alternately in upper and lower stages, and each arm portion 7 of the pressing block 3 is A workpiece clamping device for a horizontal machining center, characterized in that a pressure clamping tool 13 is disposed on the lower surface, and the upper surface 15 of the arm portion of the pressure block 3 is formed as a workpiece mounting surface.