JPS61284340A - Work clamp device for horizontal machining center - Google Patents

Abstract

PURPOSE:To increase the number of works mounted to locate accurately the reference position by disposing press blocks and center blocks alternatively on a plurality of vertical stages and a press clamp on the lower surface of an arm of the press block to form the upper surface of the arm into a work mounting surface. CONSTITUTION:Short post-like center blocks 2 and cross plate-like press blocks 3 are alternatively disposed on a plurality of vertical stages on a base plate 1 on a turntable of a horizontal machining center. The upper surface 15 of an arm member of the lower side press block 3 as a work mounting surface mounts a work W to operate hydraulically downward a press clamp 13 on the lower surface of arm member of the upper side press block 3. the fastening force and fastening reaction balanced with each other act on the work W to improve accuracy in working without deforming the press block and displacing the working reference surface on the work W. Also, the pitch between the fixed works W is shortened to increase the number of works W disposed per one surface so that the construction can be simplified, the height of the working reference surface is set with high accuracy and the works W having different heights can be fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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 clamping device for holding workpieces in multiple upper and lower stages, for example, Catalog No. MC-162-82A published by Nabeya Co., Ltd. on November 1, 1980 is used.
There is something written in.

This includes the penis plate (50) as shown in Figure 5.
Clamping devices (54) consisting of a reference block (52) and a pressing block (53) are fixed in multiple stages above and below on each side of a center push block (51) that is set upright from the center, and each clamping device (54) By holding the workpiece (55),
A plurality of workpieces (55) are fixed to a center block (51).

(Problem to be solved) In the conventional work clamp device, the reference block (52)
A plurality of pairs of the press block (53) and the press block (53) are arranged one above the other on each surface of the center block (51). 52) is located, and the workpiece (5
5) The arrangement pitch has become larger. However, the workpiece installation range in the center block is regulated by the amount of tool movement of the machining center, and with the previously unconventional system described above, it was not possible to increase the number of workpieces per center block surface. .

In addition, 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 is applied to the reference block (52), and the tightening reaction force is applied to the suppression block ( 53), the reference block (52) and the press block (53) may be deformed into a light-spreading shape, causing deviations in the work reference position.

Furthermore, a reference block (52) and a pressing block (53)
Since the reference block (52) is fixed to each surface of the center block (51) as a pair, it is necessary to assemble the reference block (52) to each surface of the center block (51) with high precision. There was also the problem that the machining reference positions on each surface were different, resulting in a decrease in machining accuracy.

(Means for Solving the Problems) The present invention provides a clamping device that can increase the number of workpieces attached in the height direction and accurately determine the work reference position for each workpiece. To this end, press blocks and short columnar center blocks, each having at least one pair of arm members protruding in opposite directions, are arranged alternately in multiple stages above and below on a base plate, and a suppression clamp is placed on the lower surface of the arm portion of the press 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, the upper surface of the arm part of the press block is formed as the workpiece mounting surface, so that the tightening reaction force that acts on the press block when the workpiece is fixed is applied to the workpiece placed on the upper surface of the press block. Since the pressure block is balanced with the tightening force from the pressure block located above the pressure block, the pressure block is not deformed and the work reference position can be accurately maintained.

Furthermore, since the upper surface of the arm portion of the press block is used as the 7-piece mounting surface, the reference block can be omitted, and a large number of works can be fixed per surface.

Furthermore, since the upper and lower surfaces of the suppression 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 Figure 2, (1) is a base plate that is removably fixed on the swivel table of a horizontal machining center, (2) is a center block formed in the shape of a short column, and (3) is a press block formed in the shape of a cross plate. .

As shown in Fig. 3, the short columnar center block (2) is formed into a substantially octagonal prism, with the pressure oil passage (4) passing through it vertically in its center and surrounding the pressure oil passage (4). The bolt insertion hole (5) is transparent.

On the other hand, the cross plate-shaped pressing block (3) is formed of a central plate part (6) formed in the same shape as the center block (2) and arm members (7) extending integrally from this central plate part (6) in all directions. The center plate part (6) has a center block (
Pressure oil passage (8) and bolt insertion hole (9) correspond to 2).
) is provided through the top and bottom.

A keyway (10) is formed in each contact surface of the cross plate-shaped press block (3) and the short column-shaped center block (2), and each arm member (7) of the press block (3) is provided with a key groove (10).
) are overlapping each other in plan view, and the center block (2
) and pressing blocks (3) are stacked alternately, and the center block (
With 2) and the pressing block (3) positioned, securely fix it to the base play (1) using the through pole (12).

Two hydraulic cylinders (13) are arranged downward in the arm member (7) of the press block (3) in line with the protruding direction of the arm member (7), and pressurized oil is supplied to the hydraulic cylinders (13). An oil guide path (14) for supplying oil is provided through the arm member (7). This oil guide path (14) communicates with a pressure oil path (8) formed in the center plate portion (6) of the press block (3).

In addition, the upper surface (1) of the arm member (7) of each pressing block (3)
5) is formed on the mounting surface of the workpiece (W).

In the figure, the symbol (16) is the pressure pro- gram located at the top (
3) is a pressure oil supply switching valve fixed to the upper surface of the center plate portion (6), and (17) is a leveling block.

In the workpiece clamping device having the above configuration, the workpiece (W) is placed on the upper surface (15) of the arm member of the lower pressing block (3), and the upper pressing block (3) located above the workpiece (W) is placed on the upper surface (15) of the arm member of the lower pressing block (3). The hydraulic cylinder (13) is actuated downward to fix the workpiece (W) in a plurality of upper and lower stages.

In this case, the pressure block (3) is equipped with a hydraulic cylinder (13
) acts upward, but the upper pressing block (3) acts on the arm upper surface (15) of the pressing block (3).
) is transmitted through the workpiece (W). Since this clamping force and clamping reaction force are almost balanced, each pressing block and lock (3) will not be deformed, and even after clamping, the top surface (15) of each pressing block (3) will not be deformed.
The distance between the base plate (1) and the top surface of the base plate (1) does not change.

Thereby, the upper surface (15) of each press block (3) becomes a stable processing reference surface.

However, since no clamping force counteracting the clamping reaction force acts on the uppermost pressing block (3), it deforms upward due to the clamping reaction force, but it is fixed by the uppermost pressing block (3). Since the machining reference plane of the workpiece (W) is the upper surface of the lower pressing block (3), the workpiece (W) can be accurately machined without any problems.

In the above embodiment, the pressing block (3) is formed in a cross shape, but it may have a shape in which the arm member (7) protrudes in a large direction,
The arm member (7) may be formed to 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 may be provided with a mechanical clamper to form a clamp tool. It is necessary to equalize the tightening force of each clamper.

(Effects) As described above, in the present invention, short columnar center blocks and suppressing blocks whose arm members protrude in opposite directions are stacked alternately to position the workpiece holder in multiple upper and lower stages. Since the clamp tool is positioned on the lower surface of the arm member of the press block, and the upper surface of the arm portion of the press block is formed as a workpiece mounting surface, only the press 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 works placed per cycle,
A machining center can be operated continuously for a long time with one setup.

Furthermore, since the upper surface of the press block is formed as a workpiece mounting surface, the clamping reaction force and the clamping force from both the upper clamps 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, the structure of the clamping device can be simplified by using only a pressing block, and since no tightening reaction force acts on the pressing block, the pressing block itself does not require strength. , the structure can be further simplified.

Moreover, since the clamping device is constructed by fixing the short columnar center block and the pressing block whose arm members protrude in opposite directions by stacking them alternately, it is possible to Since the lower surface can be formed with high precision by planar 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 used for workpieces of different heights. This is because it can be easily recombined.

[Brief explanation of drawings]

Fig. 1 is a front view of the work pallet, Fig. 2 is a plan view of the work pallet, Fig. 3 is a perspective view taken out of the main part, Fig. 4 is a vertical sectional view of the main part, and Fig. 5 is a front view of the conventional example. . DESCRIPTION OF SYMBOLS 1... Base plate, 2... Short columnar center block, 3... Suppression block, 7... (3
) arm members, 13...suppression clamps, 15...
・Top surface of arm. Figure 1 Shino 4mi

Claims (1)

[Claims] 1. Pressing blocks (3) formed by at least a pair of arm members (7) projected oppositely from each other on a base plate (1) and short columnar center blocks (2) are alternately arranged in multiple upper and lower stages, A press clamp tool (13) is arranged on the lower surface of each arm portion (7) of the press block (3), and the upper surface (15) of the arm portion of the press block (3) is formed as a workpiece placement surface. Work clamp device for horizontal machining center