JPS6116029Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a workpiece fixing device for a machine tool, and an object of the present invention is to enable a flat workpiece to be easily and reliably fixed with high precision.

In high-performance NC machine tools such as machining centers, workpieces are exchanged using a workpiece fixing device (workpiece exchange pallet) in order to increase the operating rate of the machine. That is, a large number of workpieces are set and fixed in a workpiece fixing device on the exchange table on one side of the machine tool so that each workpiece is in a predetermined position and posture, and the fixing device is moved onto the table of the machine to accurately set the workpieces. Position, fix, and perform machining.

Here, the relative position of the workpiece fixing device with respect to the table of the machine and the relative position of each workpiece with respect to the fixing device in the vertical, horizontal, and height directions have a significant influence on the dimensional accuracy of the product.

In conventional equipment, T-slots and bolt holes are provided in the base plate.
Workpieces were individually fixed to the base using these methods, but in the case of flat workpieces in particular, it is necessary to support and fix the workpieces in a raised position for drilling through-holes, etc., but each workpiece can be fixed individually. Therefore, the vertical
Positioning accuracy in the horizontal and vertical directions will deteriorate.
For this reason, it is necessary to measure the positioning error of the workpiece and take this into account during machining. Furthermore, since the workpiece is flat, the presser allowance on the sides is narrow, making it difficult to firmly fix the workpiece, resulting in misalignment during machining, resulting in defective products and damage to the machine.

In order to eliminate the above-mentioned drawbacks, the present invention fixes a reference support frame and a workpiece holding frame facing each other on a base plate with a workpiece placement space, and arranges a workpiece setting jig in the workpiece placement space. The height adjustment jig and the presser are provided with a pair of work holding parts that clamp both sides of the flat workpiece placed on the work support surface of the height adjustment jig, and a pair of work holding parts are provided on the height adjustment jig and the holding part. The presser is pressed by the clamp of the pressing means in a state in which the received portion of the presser is received by the holding member.

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

As shown in Figs. 1 to 5, a two-sided workpiece fixing device P can be placed on a turntable T placed at the front side of a machine tool M, and a pallet-shaped workpiece fixing device P can be placed there. After setting a large number of workpieces W, the workpieces W are transported onto the table 1 of the machine tool M, accurately positioned at a predetermined position, and fixed.
Machining is now being carried out.

Therefore, the workpiece fixing device P is placed on the table 1.
Two running rails 2 are attached for traveling, and a fitting hole (not shown) for positioning on the lower surface of the base plate 3 of the carried-in workpiece fixing device P is connected to a positioning device 4 consisting of a vertical hydraulic cylinder. By fitting 4a, the base plate 3 is accurately positioned.

On the other hand, the clamp claw 5a of the clamping device 5, which is a vertical hydraulic cylinder, is loosely fitted into the T-groove for clamping on the lower surface of the base plate, allowing the base plate 3 to move in the front and back direction, and the base plate 3 is positioned by the positioning device 4. After that, by lowering the clamp claw 5a, the base plate 3 is lowered and its traveling means 6 is retracted into the groove, and the support strip 7
Support and fix on top.

The traveling means 6 is formed as shown in FIGS. 6 and 7. The running wheel 6a is attached to a formwork 6c installed in a rectangular groove 6b on the lower surface of the base plate 3. The formwork 6c is urged downward by a spring 6d, and the clamp device 5 holds the base plate 3 against the spring force. When it is pulled down, the formwork 6c retracts and the running wheels 6a are prevented from protruding downward.

In addition, in order to restrict movement in the left and right direction when the base plate 3 is moved back and forth, a traveling guide rail 8 is inserted and guided in a longitudinal groove of the T groove on the lower surface of the base plate so as to be slidable back and forth.

The base plate 3 of the workpiece fixing device P is made of a thick steel plate, and a reference receiving frame 9 is fixed to the center of the upper surface thereof facing in the left-right direction, and a work placement space 11 is symmetrically provided in front and behind the reference receiving frame 9. Separate each workpiece press frame 1
0 is attached in a state parallel to and facing the reference receiving frame 9.

This workpiece holding frame 10 is fixed so as to be movable back and forth with bolts or the like via a T-groove 12 on the upper surface of the base plate 3, so that the width of the workpiece arrangement space 11 can be adjusted as necessary.

A receiving surface 13 is formed on the front and rear surfaces of the reference receiving frame 9, and this receiving surface 13 is divided into a plurality of equal parts in the left-right direction to form each unit receiving surface 13a.

Each clamping means 14 consisting of a hydraulic cylinder is attached to the workpiece holding frame 10 at a position opposite to the slightly upper part of the central part of each unit workpiece receiving surface 13a, and its output shaft 15 is inserted from the inner surface of the workpiece holding frame 10. Each output shaft 15 protrudes and faces each unit workpiece receiving surface 13a.
A clamp tool 16 is attached to the end so as to be swingable in all directions through spherical contact. In order to prevent chips from getting caught in the spherical contact portion 16A, the clamp tool 16 is urged by an elastic body 16a made of a rubber ring. Further, each output shaft 15 is configured to generate a downward pressing force by slightly tilting the tip downward.

The hydraulic oil chamber 17 of each hydraulic cylinder is connected to the workpiece press frame 1.
The output shaft 15 is moved forward or backward relative to each unit receiving surface 13a by supplying and discharging pressure oil to and from the oil path 18 through a directional switching valve 19. Configure it to do so.

In addition, the workpiece W is accurately placed on each unit receiving surface 13a.
In order to position the unit, key groove-shaped positioning fitting parts 20 are recessed at a predetermined pitch on the upper surface of the reference receiving frame 9 at the boundary between each unit receiving surface 13a, and a gate-shaped positioning tool 21 is provided here as necessary. mate.

Here, as shown in FIGS. 3, 5, and 8, a strip-shaped work setting jig 22 consisting of a height adjuster 23 and a presser 24 is arranged in the work placement space 11. One side of the height adjuster 23 is brought into contact with the receiving surface 13, the lower surface thereof is brought into contact with the upper surface of the base plate 3, and the height adjuster 23 is fixed with a bolt 25. Further, a horizontal work supporting surface 29 is provided at the upper end of the height adjusting tool 23, and a receiving portion 27 facing the work pressing frame 10 is provided at the lower side of the height adjusting tool 23. 2
3 and the clamp tool 16, the lower receiving part 28 of the presser 24 is interposed between the upper receiving part 2 and the clamp tool 16.
7.

Both sides of the flat workpiece W placed on the workpiece support surface 26 are held between a pair of workpiece pressers 29 formed above the workpiece support surface 26 and with the height adjuster 23 facing the presser 24, After temporary tightening by supplying low pressure oil to the clamping means 14 and pressing the holding tool 24 with the clamp tool 16, after correctly determining the horizontal position of the work W, high pressure oil is supplied to perform final tightening.

In order to facilitate the horizontal positioning of the workpiece W, a positioning fitting part (not shown) is also provided at the top of the height adjustment jig 23 at the position of the keyway-shaped positioning fitting part 20. The positioning tool 21 may be formed to fit over the positioning fitting portion.

Note that the height adjusting tool 23 and the holding tool 24 do not necessarily need to be formed continuously in the form of a strip, and may be discontinuously attached corresponding to each clamp tool 16.

As a modification of the above embodiment, a part can be modified as follows. In addition, the work support surface 26
The shape and height position of the workpiece W can be appropriately set by replacing the workpiece setting jig 22 according to the workpiece W.

(a) As shown in FIG. 9, by tilting the workpiece holding tool 24 forward and pressing the workpiece W, the downward holding force is increased to prevent the workpiece W from floating.

(b) As shown in FIG. 10, only the lower part of the presser 24 is continuous, and the upper half is discontinuous. In this way, each clamp tool 1
Since the degree of freedom of the portion corresponding to 6 is increased, the workpiece can be fixed more reliably, and the integrity of the presser 24 is not lost.

Since the present invention is configured as described above, it has the following effects.

Both sides of a flat workpiece placed on the workpiece support surface of the height adjuster are held between a pair of workpiece holding parts provided oppositely on the height adjustment tool and the presser, and the received part of the presser is held. The workpiece is fixed by pressing the side part of the presser with the clamp tool while the workpiece is received by the receiving part of the height adjuster, so even if the presser allowance on the side of the flat workpiece is narrow, it can be firmly fixed. can do.

Moreover, the work supporting surface of the height adjuster forms the reference plane in the height direction, and the work holding part forms the reference plane in the front and back direction. The position in the horizontal direction can be determined extremely easily and with high precision.

As a result, the work efficiency of workpiece replacement can be increased, and by improving the workpiece positioning accuracy, the operating rate of the machine can be increased and the dimensional accuracy of the product can be increased.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are a side view and a plan view of a machine tool and a turntable, respectively, FIG. 3 is a plan view, FIG. 4 is a front view, and FIG. 5 is a side view. Figures 6 and 7 are longitudinal sectional front views of the wheel portion and spring portion of the traveling means, respectively. Fig. 8 is an enlarged longitudinal sectional side view of the main part, and Fig. 9 is a view corresponding to part A in Fig. 8 of a modified example. ,
FIG. 10 is a partial front view of another modified example of the presser. 3... Base board, 9... Reference support frame, 10... Workpiece press frame,
DESCRIPTION OF SYMBOLS 11... Work placement space, 13... Receiving surface, 14... Clamping means, 15... Output shaft, 16... Clamp tool, 22
...Work setting jig, 23...Height adjustment tool,
24... Holder, 26... Work supporting surface, 27... Receiving part, 28... Received part, 29... Work holding part, W...
work.

Claims (1)

[Scope of utility model registration request] A reference support frame 9 and a workpiece press frame 10 are placed on the upper surface of the base plate 3.
are fixed in a facing manner with a work placement space 11 left therebetween, to form a workpiece receiving surface 13 facing the workpiece press frame 10 of the reference receiving frame 9, and a pressing means 14 corresponding to the receiving surface 13 is fixed to the workpiece press frame 10. A clamping tool 16 provided at the end of the output shaft 15 of the clamping means 14 is configured to face the receiving surface 13, and the clamping tool 16 can be pressed and driven toward the receiving surface 13 by the clamping means 14,
A height adjustment tool 23 and a presser tool 2 are installed in the work placement space 11.
4, a height adjusting jig 23 is removably fixed on the base plate 3 with one side of the jig 23 in contact with the receiving surface 13, and the height adjusting jig 23 is A horizontal work supporting surface 26 is formed on the upper part of the height adjusting jig 23 , and a receiving part 27 is formed on the lower part of the height adjusting jig 23 facing the work holding frame 10 . The lower part of the receiving part 28 is received by the receiving part 27, and the height adjusting jig 23 and the holding part 24 are connected to each other above the workpiece support surface 29. When a pair of opposing work holding parts 29 are formed, the work W is placed on the work supporting surface 26, and the pressing means 14 presses and drives the holding tool 24 toward the reference receiving frame 9 side via the clamping tool 16, the above-mentioned Work holding part 29
A workpiece fixing device for a machine tool, characterized in that it is configured to clamp and fix a workpiece W between the two.