JPH0217299B2 - - 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 upper and lower stages, 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. 7, clamping devices 54 consisting of a reference block 52 and a pressing block 53 are fixed to each surface of a columnar center block 51 in multiple stages above and below, and each clamping device 54 is used to clamp a workpiece 55.
By holding the center block 51, a plurality of works 55 are fixed to the center block 51.

<<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.

Furthermore, a reference block 52 and a pressing block 53
Since these are a pair, 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, so that the reference block 52 and pressing block 53 act first. It was deformed in a spreading shape, causing errors in the work reference position.

<Means for Solving the Problems> The present invention provides a clamping device that can increase the number of workpieces attached to one side of the center block and accurately determine the work reference position for each workpiece. It is characterized in that the clamping device fixed to the block is formed only by a pressing block, and the upper surface of the pressing block is formed as a workpiece mounting surface.

<<Operation>> In the present invention, since the upper surface 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 transmitted through the workpiece placed on the upper surface of the pressing block. Since the clamping force is balanced with the tightening force from the pressing block located above, the pressing block will not be deformed and the work reference position will be accurately maintained.

Furthermore, since the upper surface 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.

<<Example>> FIG. 1 is a partially cutaway front view of the main part, and FIG. 2 is a front view of a work pallet.

In the figure, 1 is a base plate detachably fixed on the swivel table of a horizontal machining center; 2
1 is a square columnar center block erected on a base plate 1, and a side plate 6 with clamp devices 5 fixed in a plurality of upper and lower stages is removably fixed to the left side 3 and right side 4 of the center block 2.

This clamping device 5 is composed of a pressing block 7 fixed to a side plate 6 and two hydraulic cylinders 8 arranged side by side in the direction in which the pressing block 7 is extended. It is formed on the surface. And each pressing block 7
is arranged such that its upper surface 9 is located at a predetermined height from the upper surface of the base plate 1.

An oil guide path 10 for supplying pressure oil to the hydraulic cylinder 8 is provided through the press block 7, and this oil guide path 10 is communicated with a pressure oil supply path 11 formed in the center block 2.

Reference numeral 12 in the figure is a leveling block, which adjusts the distance between the upper and lower pressing blocks 7 in relation to the stroke of the hydraulic cylinder 8 for clamping. Further, the symbol W is a workpiece.

FIG. 3 shows a modification in which two hydraulic cylinders 8 are arranged side by side in the width direction of the press block 7.

FIG. 4 shows a second embodiment of the present invention, in which a pressure oil supply port 13 and a fixing bolt hole 14 are formed at a fixed pitch in the center block 2, and the mounting position of the pressing block 8 can be changed. The unused pressure oil supply port 13 is sealed with a blind plug (not shown).

FIG. 5 shows a third embodiment of the present invention, in which the pressing block 7 is formed integrally with the side plate 6, and the pressing block 7 and the pressing piece 15 are brought into contact with each other with their inclined surfaces, thereby forming a clamp device. 5, and the pressure block 7 and the pressure piece 15 are made to slide on the inclined surfaces by the operation of the hydraulic cylinder 8. In this case, the pressing block 7 may be fixed to the side plate 6.

Although not shown, the pressing piece 15 is returned to the pressing block 7 and fixed with a tightening bolt via a spring, and the pressing piece 15 is slid with respect to the pressing block 7 by operating the tightening bolt. Mechanical clamping devices can be used.

In each of the embodiments described above, clamp devices 5 may be provided on each of the four circumferential surfaces of the center block 2, as shown in FIG.

Note that the positioning of the workpiece W with respect to the pressing block 7 is performed using a pin, an edge locator, or the like.

In summary, the present invention is characterized in that the pressing blocks 7 are arranged in multiple stages above and below on two opposite sides of the center block 2, and the upper surface 8 of the pressing blocks 7 is used as the surface on which the workpiece W is placed.
When the workpiece W is received on the upper surface, an upward clamping reaction force from the hydraulic cylinder 8 and the pressing piece 15 acts on the pressure block 7 when the workpiece is fixed. This balances out the clamping force from the upper clamp device 5 acting on the received workpiece W, so that the pressing block 7 is not deformed. Therefore, since the distance of the upper surface 8 of the pressing block 7 from the base plate 1 does not change, the upper surface 8 of the pressing block 7 becomes a stable machining reference surface. However, since no clamping force counteracting the clamping reaction force acts on the uppermost pressing block 7, the workpiece W fixed by the uppermost pressing block 7 deforms due to the clamping reaction force. Since the machining reference surface is the lower pressing block, accurate machining can be performed without any problems.

<<Effects>> As described above, in the present invention, workpiece clamping press blocks are arranged in multiple stages above and below on two opposite sides of the center block, and the upper surface of the press block is formed as the workpiece mounting surface. , only the press block is located between the fixed works, and the pitch between the works can be reduced. As a result, it is possible to increase the number of workpieces fixed per surface of the center block, and the machining center can be operated continuously for a long time with one setup.

Furthermore, since the upper surface of the pressing block is used as the workpiece mounting surface, the clamping reaction force and the clamping force from the upper clamp device are balanced when the workpiece is fixed, so that the pressing block is not deformed and the workpiece is fixed. The machining reference position of the workpiece will not be displaced. 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.

Furthermore, if the pressing block is fixed to the center block via the side plate, it is possible to process workpieces of different thickness by replacing the side plate, making it easy to change the workpiece fixation setup. can.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a partially cutaway front view of main parts, FIG. 2 is a front view of a work pallet, and FIG. 3 is a front view showing a modified example.
FIG. 4 is a view corresponding to FIG. 1 of the second embodiment, FIG. 5 is a view equivalent to FIG. 1 of the third embodiment, FIG. 6 is a perspective view of a modified example, and FIG. 7 is a conventional example. It is a front view. 1... Base plate, 2... Center block,
5... Clamp device, 6... Side plate, 7... Pressing block, 9... Upper surface of 7.

Claims (1)

[Claims] 1. A center block 2 is erected on a base plate 1, and clamp devices 5 are positioned on at least two opposite sides of the center block 2 at appropriate intervals in the vertical direction to hold workpieces in multiple stages above and below. In the workpiece clamping device for a horizontal machining center, the upper surface 9 of the pressing block 7 of the clamping device 5 located at a lower position among the plurality of sets of clamping devices 5 arranged vertically is attached to the workpiece of the clamping device 5 located at its upper position. A workpiece clamping device for a horizontal machining center, characterized in that it is configured as a reference surface for placement. 2. The workpiece clamping device for a horizontal machining center according to claim 1, wherein the pressing block 7 of the clamping device 5 is fixed to the center block 2 via the side plate 6. 3. A workpiece clamping device for a horizontal machining center as set forth in claim 1 or 2, wherein the pressing block 7 of the clamping device 5 is fixed to the center block 2 so that its mounting position can be adjusted. 4. A workpiece clamping device for a horizontal machining center according to any one of claims 1 to 3, wherein the clamping device 5 is a hydraulic clamping device. 5. A workpiece clamping device for a horizontal machining center according to any one of claims 1 to 3, wherein the clamping device 5 is a mechanical clamping device.