JPH0734939B2 - Turret punch press die holding mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die holding mechanism of a turret punch press for holding a molding die so that it can be lowered and retracted.

[0002]

2. Description of the Related Art In a turret punch press, as shown in FIG. 6, an upper turret 1 and a lower turret 2 are installed concentrically on a frame 3, and various punches 4 and dies 5 are attached to the upper turret 1 and the lower turret 2. It is provided in the indexing station. The punch 4 is connected to the ram 6 at a predetermined punch position P and driven up and down. The plate-shaped work W is fed back and forth and left and right on the work table 8 by the work holder 7 so that the desired position is located at the punch position P. Work holder 7
Is attached to the cross slide 10, and the cross slide
A carriage 10 is installed on the frame 3 so as to be movable back and forth (Y direction) so as to be movable left and right (X direction).

The work table 8 is a flat table provided with a transfer ball or the like for sliding and moving the flat work W on its upper surface. Therefore, for example, as shown in FIG. 7 to FIG.
When performing the forming process of the dowel forming part 12, the louver forming part 13 and the like, the die 5 as the lower mold is made to be a convex shape, and the forming parts 11 to 13 are directed upward to the work W, contrary to the case of the punching process. Allow it to be molded.

In this case, since the stroke of the ram 6 is constant, the punch 4 is shortened and the upper surface position (die height) of the die 5 is higher than the forming heights H ( It is set high only in Fig. 9). That is, the forming height H is made higher than the placement surface 8a of the work W by the work table 8.

As described above, in the case of the molding die 5, the molding die 5 is formed on the lower turret 2 in order to increase the die height.
, The work W is lifted by the die 5 even in the case of punching. Therefore, the machining accuracy is adversely affected, and the lower surface of the work W may be scratched or distorted. In addition, the adjacent indexing station may not be available.

In order to solve such a problem, there has been proposed one in which the height of the molding die 5 can be adjusted by a fluid pressure actuating device, and the molding die 5 is projected only when in use. (Japanese Utility Model Publication No. 1-11111, Japanese Patent Application No. 1-116883, etc.).

[0007]

However, in the above-mentioned conventional example in which the molding die 5 is projected and retracted by the fluid pressure actuating device, the molding die 5 is held in the projecting state with the fluid flow locked. Therefore, there is a problem that the protrusion holding of the die 5 is unstable and the processing accuracy is lowered.

An object of the present invention is to provide a die holding mechanism of a turret punch press which can adjust the height of a molding die and can stably hold the protruding state.

[0009]

In the die holding mechanism of the turret punch press of the present invention, a die for molding is movably installed on the lower turret, and the die is moved up and down by a cam mechanism on the outer periphery of the die. It is a thing. That is, a pair of ring-shaped rotary cams and fixed cams are provided on the outer circumference of the die, the cam surfaces being engaged with each other vertically to move the die up and down with rotation. Further, a cam drive device for rotating the rotary cam is provided on the lower turret. Either the rotary cam or the fixed cam may be provided on the die side or the lower turret side.

[0010]

According to this structure, when the rotary cam is rotated by the cam drive device, the engagement positions of the rotary cam and the cam surface of the fixed cam change, and the die moves up and down together with the cam on the die side. By such an ascending / descending operation, the die is lifted and protruded from the die height when it is used for molding, and is lowered to the die height or lower when it is unnecessary. In the above-mentioned lifted state, the die is supported by the cam over substantially the entire outer peripheral portion, so that the die is stably supported.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to the turret punch press having the schematic structure described with reference to FIG.

In FIG. 1, the lower turret 2 is a frame 3
It is rotatably provided on the upper side through a rotary shaft (not shown), and a die installation hole 14 is provided at each indexing station. Cover the upper surface of this die installation hole 14
15 are arranged and fixed to the lower turret 2 by a positioning pin, a fixing bolt, etc. not shown. Die holding table 15
Supports the die 16 for molding and also mounts the workpiece.
17 is supported by a bolt or the like not shown.

The work mounting table 17 has a loose fitting hole 17a into which the die 16 is loosely fitted, and the upper surface height is set to the same height as the mounting surface 8a of the work table 8 (FIG. 5), that is, the die height. There is. A ring-shaped cam guide member 18 is arranged at a position surrounding the die 16 on the upper surface of the die holding table 15 and the fixing bolt is provided.
It is fixed to the die holding table 15 by 19. Inside the cam guide member 18, an upper cam 20 which is a ring-shaped fixed cam
And a lower cam 21 which is a rotating cam are superposed on each other and fitted together. The upper cam 20 is a retainer 36 that constitutes the die 16.
It is fixed to the lower surface of the with fixing bolts 22.

Further, the die holding table 15 is provided with a guide hole 24 penetrating the guide shaft 23 vertically provided on the lower surface of the retainer 36 at a position corresponding to the die installation hole 14 of the lower turret 2.
A spring hook 25 is screwed onto the lower end of the guide shaft 23.
A return spring 26 that urges the die 16 downward is provided between the spring hook 25 and the die holder 15.

The lower cam 21 is rotatably fitted inside the cam guide member 18. As shown in FIG. 2, a gear portion 21c is formed on a part of the outer periphery of the lower cam 21 and the upper surface thereof has a mountain portion 21c.
It is a cam surface in which a and valleys 21b are alternately formed.
In addition, the lower surface of the upper cam 20 (FIG. 4) has a mountain portion 21a of the lower cam 21.
Also, the cam surface is formed by a valley portion 20b and a mountain portion 20a that mesh with the valley portion 21b.

In FIG. 2, the gear portion 21c of the lower cam 21 is
The cam guide member 18 is exposed to the outside through an opening 18a formed in a part of the cam guide member 18, and meshes with a rack 28 driven forward and backward by an air cylinder 27. The air cylinder 27 is a single-acting type that returns with a built-in return spring. The rack 28 is fitted in a plurality of guide rollers 29 provided on the die holding table 15 at guide grooves 28a and guided in a linear direction. The air cylinder 27 and the rack 28 form a cam drive mechanism 46.

Air is supplied to the air cylinder 27 from an elevating mechanism 30 (FIGS. 1 and 3) provided at a punch position of the frame 3 via an air pipe relay 31. The air pipe repeater 31 has a die holding table at the installation position of each molding die 16.
A coupler 31a is provided penetrating from 15 to the lower turret 2 and is connectable to the coupler 30a on the lifting mechanism 30 side.

The elevating mechanism 30 is constructed so that an elevating table 32 is movably supported by a base 35 via a pair of guide bars 33 and a guide sleeve 34, and is vertically moved by a single-acting air cylinder 36. There is. Air is supplied to the coupler 30a of the elevating mechanism 30 from an air supply source (not shown) through the pipe 43 of the elevating table 32. The height position of the coupler 30a is determined by the guide sleeve 34
Detected by a sensor 44 attached to the.

In FIG. 1, the die 16 comprises a retainer 36 integrally formed with the guide shaft 23, a die chip 38 fixed to the center of the retainer 36 with a screw 37, and an ejector plate 39 for discharging a work. The ejector plate 39 is
The retainer 36 is supported by the elastic body 40 and the guide pin 41
It is supported by a guide hole 36a of the retainer 36 via a through hole. The guide pin 41 is fixed to the ejector plate 39 with a screw portion at the upper end. Further, the retainer 36 is locked to the die holding base 15 via the rotation stop pin 42 so that only the vertical movement is possible.

In FIG. 2, the die holding base 45 formed adjacent to the installation portion of the die holding base 15 for molding on the lower turret 2 is for holding the die for punching. is there.

The operation of the above configuration will be described. Mold for molding
When the die 16 is not used, that is, when the die 16 is not located at the punch position P in FIG. 5, the die 16 is lowered as shown in FIG. In this case, the air cylinder 27 has retracted the rack 28 to the position shown in FIG. 2, and as shown in the sectional view of FIG. 4 (A), the peak portion 21a of the lower cam 21 is the valley portion of the upper cam 20.
It is in a state of being engaged with 20b. Due to the meshing state of the upper cam 20 and the lower cam 21 as described above, the die 16 is lowered.

In this lowered state, the die 16 is at the same level as the upper surface of the work table 17 or below. Therefore, even if the work W is fed on the die 16, the work W can be fed without the work being lifted by the die 16, and there is no problem of deterioration of machining accuracy and scratching of the surface of the work W. Further, since there is no problem of lifting of the work W as described above, the indexing station adjacent to the indexing station provided with the molding die 16 (installation position of the die holding table 45 in FIG. 2) is also used for punching. It will be possible.

When the die 16 is used at the punch position P, the indexing of the die 16 causes the coupler 31a of the air pipe relay 31 and the coupler 30a of the elevating mechanism 30 to face each other.
The elevating mechanism 30 is driven upward to connect the couplers 30a and 31a.

In this state, air is supplied to the air cylinder 27 to drive the rack 28 to move forward, and as shown in FIG. 4 (B), the ridge portion 20 of the upper cam 20 is placed on the ridge portion 21a of the lower cam 21.
The lower cam 21 is rotated to a position where a rides. This causes the die 16 to rise against the return spring 26, as shown in FIG. That is, the upper surface of the retainer 36 rises to a level where it is flush with the upper surface of the work mount 17. In this state, the die chip 38 and the ejector plate 39 are held in a state of protruding from the work mounting table 17, so that the molding process as shown in, for example, FIGS. 7 to 9 can be performed. At this time, the ridges 20a of the upper cam 20 and the ridges 21a of the lower cam 21 have a sufficient width, so that even if there is some error in the advancing / retreating stroke of the rack 28, the die 16 can be projected sufficiently stably. Can be held. Further, since the die 16 is supported by the cams 20 and 21 over substantially the entire outer circumference, the die 16 is also stably held in the protruding state.

When removing the die 16 from the punch position P,
The rack 28 is retracted to its original position by the air cylinder 27, and the lower cam 21 is rotated to a position where the crest portion 21a thereof meshes with the trough portion 20b of the upper cam 20. As a result, the die 16 descends to the original height position. When the lowering of the die 16 is completed, the lifting table 32 of the lifting mechanism 30 moves down, and the coupler 30a on the lifting mechanism 30 side is disconnected from the coupler 31a of the air pipe relay 31 corresponding to the die 16. As a result, the lower turret 2 can be rotated, and the next indexing operation can be started.

In the above-described operation of raising and lowering the die 16, the advancing and retracting stroke of the rack 28 is such that the lower cam 21 is rotated from the position where the peak 21a of the lower cam 21 meshes with the trough 20b of the upper cam 20 to the position where it overlaps the peak 20a. Since it only needs to be moved, the operating areas of the air cylinder 27 and the rack 28 can be limited, and the installation space for these can be kept as small as possible.

In the above embodiment, the cam drive device 46 is composed of the air cylinder 27 and the rack 28.
21 may be rotated by a combination of an air cylinder and a link mechanism or a worm mechanism and a motor. Further, either of the upper and lower cams 20 and 21 may be the rotation side.

[0028]

According to the die holding mechanism of the turret punch press of the present invention, the die is installed on the lower turret so that the die can be moved up and down, and the cam surfaces are vertically engaged with each other on the outer periphery of the die to rotate the die. Since a pair of ring-shaped rotary cams and fixed cams for moving up and down are provided, the molding die protruding from the die height can be retracted to the lowered position when not in use. Therefore, the work can be fed with the unused die without lifting the work, lowering the processing accuracy and preventing scratches on the bottom surface of the work, and it is also possible to use the turret indexing position adjacent to the forming die. . Further, since the die is moved up and down by the ring-shaped cam, there is an effect that the die can be stably held in the protruding state.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing the structure of a die holding mechanism of a turret punch press according to an embodiment of the present invention.

FIG. 2 is a plan view showing a part of a main portion thereof by breaking.

FIG. 3 is a cutaway front view showing the configuration of the lifting mechanism.

FIG. 4 is a sectional view showing the operation of the cam mechanism.

FIG. 5 is a cross-sectional view showing a protruding and holding state of the die.

FIG. 6 is a side view of a conventional turret punch press.

FIG. 7 is a cross-sectional view showing an example of the forming process.

FIG. 8 is a cross-sectional view showing another example of the forming process.

FIG. 9 is a perspective view showing still another example of the forming process.

FIG. 10 is a partially enlarged cross-sectional view of the same molding processing example.

[Explanation of symbols]

2 ... Lower turret, 15 ... Die holding base, 16 ... Die, 20 ... Upper cam, 20a ... Mountain portion, 20b ... Valley portion, 21 ... Lower cam, 21a ... Mountain portion, 21b ... Valley portion, 21c ... Gear portion, 23 ... Guide shaft, 26 ... Return spring, 27 ... Air cylinder, 28 ... Rack

Claims (1)

[Claims] 1. A pair of ring-shaped rotary cams in which a molding die is installed in a lower turret so as to be able to move up and down, and cam surfaces are vertically engaged with each other on the outer periphery of the die to move the die up and down with rotation. And a die holding mechanism of a turret punch press, in which a fixed cam is provided and a cam drive device for rotating the rotary cam is provided in the lower turret.