JPS5933569Y2 - Workpiece positioning device - Google Patents

Description

[Detailed description of the invention] Before machining a workpiece with a tool in a machine tool, positioning pins are provided protruding from the jig body in order to position and fix the workpiece to the jig body. It is customary to position the pin by fitting a machining reference hole drilled into the object into the object, fix it with a clamping device, and then perform machining with a tool.

If the shape and dimensions of the workpiece are different, the positional relationship of the machining base holes will also be different, so naturally the positioning pins protruding from the jig body should be adjusted according to the positional relationship of the machining base holes of the workpiece to be machined. must be established.

Therefore, when machining two or more types of workpieces with one machine tool, it is necessary to provide two or more sets of positioning pins that match the positional relationship of the machining reference holes of the workpieces to be machined. .

Therefore, conventionally, a plurality of sets of positioning pins are provided on a jig so as to be retractable, and a particular workpiece is positioned by protruding a particular set of positioning pins.

However, the position at which the workpiece is machined on the jig by the machining head of the machine tool is almost the same even if the machining head is a turret head, so the position where the positioning pin should protrude is Even if the workpieces are different, they are located close to each other.

Therefore, if there is a slight deviation in the position of the machining reference hole on the jig for two or more workpieces, even if the positioning pin is retractable, the position of the machining reference hole on the jig may be If the deviation is smaller than the shaft diameter of the holding shaft that holds the positioning pin, there are problems such as interference between the holding shafts.

In view of this problem, the present invention includes at least two sets of positioning pins that are compatible with the machining reference holes of multiple workpieces to be machined, and are provided protrudingly on the movable plate at positions where they do not interfere with each other. The jig body is provided with a movable plate that is movable in a plane substantially perpendicular to the clamping direction of the clamping device, and the movable plate is configured to use the required positioning pins depending on the workpiece. At least two sets of positioning pins arranged in a predetermined positional relationship are protruded from the jig table, and a set of positioning pins adapted to the positional relationship of the machining reference hole of the workpiece is selectively determined. The present invention relates to a workpiece positioning device that is arranged to correspond to a machining reference hole of a workpiece to be carried above.

The present invention will be explained based on embodiments shown in the drawings.

This embodiment is a positioning device for a machine tool that performs the same machining on two types of workpieces of different sizes at a common machining station.

The jig main body 1 is arranged in a column shape on a jig base 2, and the workpiece 3 is placed on a pallet 4 and carried onto the jig base 2.

A plurality of processing reference holes 5 are bored in the workpiece 3,
A positioning pin, which will be described later, is fitted into the reference hole 5, and the clamp arm 6 brings the workpiece into pressure contact with the stepped portion of the positioning pin that forms the work reference surface to complete positioning.

A tool head 8 equipped with a tool 7 is moved forward and backward by a feeding cylinder device 10 on a fixed base 9 in a direction substantially perpendicular to the front surface of the jig body 1, and after the positioning of the workpiece 3 is completed, the headstock motor 11 is driven. The spindle 12 is rotated and moved to the frontmost position, which will be described later, and the workpiece 3 is thereby moved by the tool 7 held by the spindle 12.
Process.

The clamp arm 6 has one end pivotally supported by a fixed block 13 protruding from the front surface of the jig body 1, and a clamper 14 that abuts the workpiece 3 at the other end. The end of a rod 16 connected to a piston of a clamping cylinder 15 provided on the back side is engaged with a long hole 17 formed at an intermediate position, and the workpiece 3 is moved through the clamper 14 by the operation of the cylinder 15. A force is generated that presses the object to the left of the paper in Figure 1.

A movable plate 18 that forms almost the same surface as the front surface of the jig body 1 is vertically movably joined to the jig body 1 by a dovetail groove 19, and the upper end of the movable plate 18 is connected to the jig body 1. It is coupled to a piston rod 21 of a shift cylinder 20 provided at the upper end.

On the front surface of the movable plate 18, there are a set of positioning pins 22, 22 to be fitted into the processing reference hole of the workpiece 3A, and a positioning pin 23, which should be fitted to the processing reference hole of the workpiece 3B. 2
Two of the sets No. 3 are provided in a protruding manner at positions where they do not interfere with each other.

Thus, when the movable plate 18 is in the position shown by the solid line in FIG. The positioning pins 23, 23 adapted to the workpiece 3B are shown indexed to positions where they fit into the workpiece 3BK.

These positioning pins 22 and 23 have a truncated conical surface at their tip and step portions 24 and 25 forming a machining reference surface at their base, respectively.

Machining - A bracket 26 is attached to the top of the rad 8 to attach the jig body 1.
A cylindrical contact member 27 is fixed to the tip of the bracket 26 with its axial direction perpendicular to the front surface of the jig main body 1.

A rocking plate 28 that can swing in a plane parallel to the surface of the movable plate 18 is fixed 29 on the jig main body 1, and a long groove 30 is formed in the free end of the rocking plate 28. It is engaged with an engagement pin 31 set on the movable plate 18, and the swing plate 28 is caused to swing as the movable plate 18 is moved up and down.

The movable plate 30 is provided with cylindrical stoppers 32 and 33 that protrude in parallel with the axial direction of the abutting member 29 to abut the abutting member 27 of the bracket 26. 18 indexes the positioning pin 22 for the workpiece 3A, the stopper 32 on the swing plate 26 moves against the abutting member 27.
When the movable plate 18 indexes the positioning pin 23 for the workpiece 3B to fit into the machining reference hole of the workpiece 3B, the stopper 33 on the swing plate 28 comes into contact with the They are placed in positions where they abut against the member 27, respectively.

In FIG. 2, the position of the swing plate 28 indicated by a solid line indicates a state in which the stopper 32 is indexed to a position where it abuts against the abutment member 27, and the two-dot chain line indicates a state in which the stopper 33 is indexed.

In addition, in the figure, 41 is a reference metal that comes into contact with the reference surface of the workpiece 3 together with the processing reference surfaces formed on the positioning pins 22 and 23 to support the workpiece 3, and 42 is a reference metal that supports the workpiece 3 before the workpiece 3 is carried in. A stopper 45 controls the forward end position of the workpiece 3 in the moving direction of the pallet 4 by sending pressure oil into the cylinder 43 and lifting the piston 44. This is a button for removing the workpiece 3 from the positioning pins 22 and 23.

In the positioning device having the above configuration, before carrying the workpiece 3 onto the jig base 2, the positioning pins 22 that are compatible with the workpiece 3 (for example, 3A) are attached to the workpiece on the jig main body 1. After carrying in the workpiece 3, the clamp cylinder device 15 is activated to rotate the clamp arm 6, and the clamper 14 presses the workpiece 3 toward the jig main body 1./The positioning pin 22 The truncated conical surface at the tip engages with the opening of the machining reference hole 5 of the workpiece 3, and the pin 22 is inserted into the reference hole 5 while slightly lifting the workpiece 3, The stepped portion 24 of the positioning pin 22 and the reference metal 41 are fixed by pressure contact with the clamper 14 at a position where they contact the surface of the workpiece 30, and positioning is completed.

Then, the work head 8 is moved by the operation of the cylinder device 10, and the contact member 27 fixed to the tip of the bracket 26 is moved.
The spindle 12 is rotated and advanced to a position where it abuts against the stopper 32 of the rocking plate 28, whereby the tool 7 applies the required machining to the workpiece 3.

Next, when processing a different type of workpiece (for example, 3B) as the workpiece 3, the shift cylinder 20 is activated to move the movable plate 18 to the second position before carrying in the workpiece 3B.
When shifting downward to the position indicated by the two-dot chain line in FIG. It becomes possible to engage with the processing reference hole of the workpiece 3A.

Then, by the same operation as described above, the workpiece 3A is positioned on the jig main body 1, fixed by the clamp device, and processed by the tool 7 of the work head 8.

In addition, as the movable plate 18 shifts, the swing plate 2
8 is swung by engagement between its long groove 30 and an engagement pin 31 provided on the movable plate 18, and the stopper 33 for the workpiece 3B is shifted to the position where the stopper 32 for the workpiece 3A was. Determined.

When the workpieces are different, the heights of the stoppers 32 and 330 are usually different as shown in the figure, and the abutting member 27 provided on the work head 8 side that should come into contact with the stoppers 32 and 33 is always the same. Because it moves forward on a line, when changing the type of workpiece, it is often necessary to change the height of the stopper at the same position. If you want to keep it fixed, use the positioning pin 2
At the same time as the selection and indexing of the sets 2 and 23, either the corresponding stopper 32 or 330 is indexed and positioned at the abutment position of the abutment member 27.

In the present invention, a jig is used to move the movable plate in a plane substantially perpendicular to the direction of the force applied to the workpiece by the clamper of the clamping device (in the illustrated embodiment, the direction perpendicular to the surface of the movable plate). At least two sets of positioning pins are provided on the main body and project from the movable plate in a positional relationship that is adapted to the machining reference holes of different types of workpieces. By moving the movable plate in the moving direction according to the type of the workpiece, a set of positioning pins in a positional relationship that matches the processing reference hole of the workpiece is indexed to the mounting position of the workpiece and matched with the clamping device. Therefore, even if the deviation of the machining reference hole due to the difference in the type of workpiece is extremely small, the required set of positioning pins should be projected at the mounting position on the jig body of the workpiece, and other The positioning pin can be placed in a position that does not interfere with the workpiece, making it extremely easy to replace the positioning pin when positioning multiple types of workpieces with slight deviations in the position of the machining reference hole. It can be obtained easily.

In addition, a stopper corresponding to the type of workpiece is fixedly protruded on the rocking plate that swings in conjunction with the movable member, so that when the positioning pin is replaced, the workpiece that uses the positioning pin at the same time is replaced. If you replace the stopper that matches the object and place it in a position where it contacts the contact member of the work head, you can replace the stopper by shifting the movable plate without using a cylinder for changing the stopper. In addition, compared to the case where the stopper is movable and retractable and the height is changed at that position, malfunctions can be eliminated.

Furthermore, the moving direction of the movable plate is not limited to the vertical direction shown in the figure, but may be in any direction within a plane perpendicular to the direction in which the workpiece is pressed by the clamp device, and linear or curved movement is adopted. You can also.

[Brief explanation of the drawing]

Figure 1 is a front view of one embodiment of the present invention, and Figure 2 is the same as Figure 1.
It is a side view of the jig main body along the -■ line. In the figure, 1 is the jig body, 3 is the workpiece, 5 is the machining reference hole of the workpiece, 6 is the clamp arm, 7 is the tool, 8 is the work head, 18 is the movable plate, 22° 23 is the positioning 27 is a contact member, 28 is a swing plate, and 32 and 33 are stoppers.

Claims (1)

[Scope of Claim for Utility Model Registration] A workpiece carried onto a jig base is fitted into a positioning pin protruding from the jig body through a machining reference hole drilled in the workpiece, and then clamped. The workpiece is positioned and fixed on the jig body by pressing the workpiece in the direction of the jig body with a device), which is movable in a plane substantially perpendicular to the pressing force direction of the clamping device. A movable plate is provided on the jig body, and at least two sets of positioning pins arranged in a predetermined positional relationship are protruded from the movable plate to adapt to the positional relationship of the machining reference hole of the workpiece. A workpiece positioning device characterized in that a set of positioning pins is selectively determined and made to correspond to a machining reference hole of the workpiece.