JPH04141340A - Positioning device for pallet in machine tool - Google Patents

Abstract

PURPOSE:To position large and small pallets with a set of positioning means engaged with a set of positioning means and recess being formed at the position corresponding to the other set, on the pallet lower face, by arranging plural sets of positioning means on the pallet placing face of a machine tool. CONSTITUTION:Locating pins 7a, 7b are erected with four pieces becoming one set respectively at the specified position of the bed 1 of a machine tool. A positioning hole is formed at the position corresponding to the locating pin 7a on the back face of a small sized pallet 13a. A positioning hole is formed at the position corresponding to the locating pin 7b, on a large sized pallet 13b and also recess 13c is formed at the position corresponding to the pin 7a. Therefore the large sized pallet 13b can position by the pin 7b without being disturbed by the pin 7a, large and small pallets 13a, 13b can surely position alike.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a pallet positioning device for a machine tool that automatically carries in and out a pallet on which a workpiece is placed and fixed to process the workpiece. It is related to.

[Prior Art] An example of a machining center incorporated in a flexible manufacturing system or the like is shown in FIGS. 6 and 7, for example.

In the figure, 1 is a bed, and 2 is a saddle, which are supported by the bed 1 so as to be movable in the direction of arrow Y.

A column 3 is supported by the saddle 2 so as to be movable in the direction of arrow X. Reference numeral 4 denotes a spindle head, which is supported by the column 3 so as to be movable in the direction of arrow Z. 5 is a main shaft, which is rotatably supported by the main shaft head 4. A motor 6 is fixed to the spindle head 4 and rotates the spindle 5 via a transmission means (not shown).

Locating pins 7 have truncated conical guide portions formed at their tips, and are erected on the bed 1 at predetermined intervals.

Reference numeral 8 denotes a hydraulic cylinder (hereinafter simply referred to as cylinder), which is arranged inside the bed 1. 9 is guide play I.
and is fixedly supported by the cylinder 8.

The cylinder 8 and the guide plate 9 constitute pallet guiding means and fixing means, and 610 is a bracket fixed to the bed 1. A cylinder 11 is supported by the bracket 10. 12 is a hook,
It is rotatably supported by a cylinder 11.

Reference numeral 13 denotes a pallet, and a groove is formed on the lower surface of the pallet to slidably fit into the guide plate 1 and 9, and a positioning hole into which the locate pin 7 is inserted and removed.

A hook 14 is fixed to the front of the pallet 13. The hook 12 is removably engaged with the hook 14.

With this configuration, when the workpieces (not shown) fixed on the pallets 1 to 13 are processed, the cylinder 8 is activated to push up the guide plate 9. Then, the pallet 13 is also pushed up and the positioning hole is separated from the locate pin 7. Then, when the hook 12 is engaged with the hook 14 and the cylinder 11 is activated, the pallet 13 moves along the guide plate 9 and is sent out toward the next process.

On the other hand, when the pallet 13 is sent to a predetermined supply position from the previous process, the hook 12 is engaged with the hook 14, the cylinder 11 is activated, and the pallets 1 to 13 are delivered to the predetermined position along the kite plate 9. Pull in. Then, when the hook 12 is removed from the hook 14, the cylinder 8 is activated to lower the kite plate 9. Then, the pallet 13 also descends along with the guide play) and the pallet 1-1
The pallets I-1 and 3 are positioned by fitting into the positioning holes No. 3 or the four cage pins 7. Furthermore, when the kite plate 9 is lowered, a pallet 1-13 is formed between the location 1-pin 7 (or bed 1) and the guide plate 9.
is clamped and fixed.

When such a machine tool is operated unmanned, the number of workpieces to be machined during unmanned operation is placed in advance on pallets 1 to 1.
It is necessary to prepare it in a state where it is fixed at 3.

The pallets (13) to 13 used are set to a size that can accommodate the largest workpiece to be machined by the machine tool, in terms of positioning accuracy with respect to the machine tool and stability against machining force. . Therefore, the four cages 1 to pins 7 erected on the bed 1 are also placed at positions corresponding to the size of the pallet 13.

[Problem to be solved by the invention] When processing small workpieces with short machining time unmanned for a long time, it is necessary to define the number of workpieces that can be processed on a pallet during the unmanned operation time. , with a large number of pallets,
A huge stocker is required to store the pallets I~ without fixing the workpieces. This lick, a huge expense,
Installation space or storage space for pallets is required.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a pallet positioning device for a machine tool that enables positioning of a plurality of types of pallets of sizes suitable for workpieces.

[Means for Solving the Problem] In order to achieve the above object, in the present invention, a plurality of sets of positioning means are arranged on the pallet mounting surface of the machine tool, and one set of the positioning means is arranged on the lower surface of the pallet. Form one set of positioning means that engages with the other set of positioning means, and gaps corresponding to the other set of positioning means on the machine tool side.

[Function] Then, when a pallet is supplied to a machine tool, the positioning means formed on pallets 1 to 1 select and engage one set of positioning means arranged on the machine tool side. and position the pallet.

At this time, since a recess is formed in the pallet, the pallet will not interfere with another set of positioning means provided on the machine tool side.

〔Example] Embodiments of the present invention will be described below based on the drawings.

1 to 4 show a first embodiment of the present invention, and in these figures, the same parts as in FIGS. 6 and 7 are designated by the same reference numerals.

Locating pins 7a and 7b are erected at predetermined positions on the bed 1 in groups of four or in pairs. 13a
1 is a small pallet 1~, and positioning holes are formed at positions corresponding to the four game pins 1~7a. ], 3
b is a large pallet, with positioning holes formed at positions corresponding to the locate bins 71], and four locate pins 7a.
A relief 13C is formed at a position corresponding to .

With such a configuration, when positioning the small pallet 13a, the cylinder 11 pulls the pallet 13a into a predetermined position along the kite play 1-9. Then, by operating the cylinder 8, the kite plate 9 is lowered.

Then, the pallet 13a descends together with the kite plate 9. At this time, the positioning holes formed in the pallet 13a fit with the locating pins 7a, and the pallet 1
3a is positioned.

In addition, when positioning large pallets 1 to 13b,
After the pallet 1.3b is pulled into a predetermined position along the guide plate 9, the cylinder 8 is actuated to
Move the guide plate 9 down.

Then, the pallet 13b is lowered together with the guide play 1, and the positioning holes formed in the pallet 13b are fitted with the locating pins 7b, thereby positioning the pallet 13b. At this time, since the recess 13c formed on the pallet 13b corresponds to the locate pin 7a, the four cases I to pin 7a do not interfere with the pallet i3b.

In addition, in the said Example, although the positioning of the pallet 1-13a, 13b of two types of sizes was demonstrated, the size of a pallet may be three or more types.

As described above, in the above embodiment, multiple types of pallets of different sizes can be positioned and fixed according to their respective sizes, so that pallets can be used for one cycle according to the size of the workpiece. As a result, the picker can be made smaller, and the installation space and pallet storage space can be reduced. In addition, the cost for equipment can be reduced.

FIG. 5 shows a second embodiment of the present invention, in which 20 is the base of the machine tool. A positioning ring 21 is fixed to the base 20, and a plurality of tooth grooves are radially formed on the end face thereof. 22 is also a positioning ring, which is fixed to the base 20 so as to be located concentrically with the ring 21, and has a plurality of tooth grooves radially formed on its end face.

23 is a small pallet. Reference numeral 24 denotes a positioning ring, which is fixed to the pallet 23 and has a plurality of tooth grooves radially formed on its end surface to mesh with the tooth grooves of the ring 21. 2
Reference numeral 5 denotes a fixing pull stud, which is fixed to the pallet 23 so as to be located at the center of the ring 24.

26 is a large pallet l-027 is a positioning ring fixed to the pallet 26, and the ring 2 is attached to the end surface of the pallet 26.
A plurality of tooth grooves that mesh with the tooth grooves of No. 2 are formed radially. Reference numeral 28 denotes a fixing pull stud, which is fixed to the pallet I 26 so as to be located at the center of the ring 27.

With such a configuration, a positioning device suitable for turning can be configured.

[Effects of the Invention] As described above, according to the present invention, pallets that match the size of the workpiece can be positioned in a state suitable for each workpiece.

In addition, since the size of the pallet can be selected according to the size of the workpiece, it is possible to reduce the storage space, slots, etc. of the pallet, and reduce the costs associated with them. I can do it.

[Brief explanation of drawings]

Fig. 1 is a plan view of the positioning device according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a side partial sectional view of Fig. 2, and Fig. 4 shows the size of the pallet. FIG. 5 is a front view showing a changed state, and FIG. 5 is a perspective view showing another embodiment of the present invention. FIG. 6 is a front view of the vertical machining center, and FIG. 7 is a side view of FIG. 6. 7a, 7b... Locate pin, 13a 13b, 23.26-palette l-113c.
...Escape, 21.22 24.27...Ring, patent applicant
Hitachi Seiko Co., Ltd. Agent Patent Attorney Tamotsu Kobayashi Agent Patent Attorney Akihiro Otsuka Figure 7

Claims (1)

[Claims] In a pallet positioning device for a machine tool that automatically carries in and out a pallet on which a workpiece is placed and fixed, a plurality of sets of positioning means are arranged on the pallet mounting surface of the machine tool, and the 1. A pallet positioning device for a machine tool, characterized in that one set of positioning means engages with one set of positioning means, and reliefs are formed at positions corresponding to the other sets of positioning means on the machine tool side.