JP2565971B2 - Punch press with automatic die changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a punch press equipped with an automatic die changing device for punching a workpiece.

(Prior Art) Conventionally, in a punch press equipped with an automatic die changer for punching a workpiece, the punch, die and die provided in the punch holder and die holder are exchanged by the automatic die changer. ing. Moreover, when the punch, the die and the die are exchanged by the automatic die exchanging device, the punch holder is moved up and down so that the ram portion (striker portion) that moves up and down such as the top dead center of the ram stops at a fixed position. Is normal.

Therefore, in a conventional punch press equipped with a die automatic changing device, the height from the die mounting portion to the punch mounting portion (hereinafter referred to as shut height) when the die is exchanged.
In order to keep constant, the hydraulically driven punch press keeps the shut height constant by moving the cylinder. Further, in a punch press equipped with a clutch and a brake, it is difficult to keep the shut height constant because, for example, the top dead center of the ram varies, and a fine adjustment device using a worm gear or the like has been used.

(Problems to be Solved by the Invention) By the way, in the punch press provided with the above-described automatic die changing device, when the die is changed by the automatic die changing device, an apparatus is used to keep the shut height constant. There is a problem that it is complicated and expensive, and the operation for keeping the shut height constant is very troublesome.

The object of the present invention is to improve the above-mentioned problems.
The gripper arm that composes the grip of the automatic mold changer for changing the mold is adjustable in height so that the mold can be easily replaced even if the shut height is not constant. To provide a punch press.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a punch and a die that are replaceable with a punch holder and a die holder that are coaxially arranged and that have a gripped portion. And a die automatic changer equipped with a grip consisting of the punch and die gripper arm and its arm base to replace the punch and die at the same time. Automatic mold replacement in which either one can adjust the height position with respect to the arm base and can engage with the one gripped part, while the other arm can engage with the other gripped part as it is A punch press equipped with a device was constructed.

(Effect) By adopting the present invention, even if the shut height is not constant, one of the grip gripper arm of the grip and the gripper arm of the die of the automatic die changer is higher than the arm base. By adjusting the height position of one gripper arm, one gripper arm engages with and grips one of the gripped parts, while the other gripper arm remains as it is. The gripped portion is engaged and gripped. Thus, the punch and the die respectively provided in the punch holder and the die holder are grasped by the respective gripper arms and easily replaced.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 9 and FIG. 10, a punch press 1 equipped with an automatic die changing device includes an upper frame 7 supported in a cantilever manner on a column portion 5 standing on one side of a base frame 3.
It is configured as a C-shaped frame provided with. In the throat portion 9 of the C-shaped frame, a sub-column portion 11 is erected in the vicinity of the column portion 5, and the sub-column portion 11 has a beam member 13 extending along the upper frame 7. Is cantilevered.

A punch holder 17 supporting a punch 15 is rotatably supported at the tip end of the beam member 13 so as to be vertically movable and rotatable, as will be described later. A die holder 21 that supports a die 19 corresponding to the punch 15 is rotatably provided at the other end of the bench frame 3 so as to face the holder 17. In order to move the punch holder 17 up and down, a ram 23 is movably supported at the tip of the upper frame 7, and the ram 23 and the bunch holder 17 are appropriately connected. The ram 23 is appropriately connected and driven via an eccentric portion of an eccentric shaft 25 rotatably supported at the tip of the upper frame 7 and a connecting guide 27. The eccentric shaft 25
Are appropriately interlocked with a motor 29 mounted on the upper frame 7 via an appropriate clutch device 31. Since the configuration in which the ram 23 is moved up and down by the rotation of the motor 29 is a general configuration, a detailed description thereof will be omitted.

With the above structure, the punch holder 17 is integrally moved up and down by the ram 23 being moved up and down by the drive of the motor 29. Therefore, by positioning the plate-shaped work piece W between the punch 15 and the die 19, the work piece W can be punched.

In order to move and position the work piece W, a work moving / positioning device 33 is arranged at the front position (left side in FIGS. 9 and 10) of the base frame 3. The work moving / positioning device 33 moves and positions the work piece W in the X-axis and Y-axis directions with respect to the processing position by the punch 15 and the die 19, and is generally used in, for example, a turret punch press. Since it may have a general configuration, the description of the detailed configuration will be omitted. Further, the base frame 3 is provided with a conveyor device 35 for carrying out a product or scrap processed by the punch 15 and the die 19 in the backward direction. The die device 19 side of the conveyor device 35 is, for example, an air blower. It is provided so as to move up and down by an appropriate actuating device (not shown) such as a cylinder.

Therefore, the workpiece W is automatically machined by the punch 15 and the die 19 while the workpiece positioning device 33 automatically positions and moves the workpiece W in the X-axis and Y-axis directions. Will be performed. The product or scrap generated in the above processing can be automatically transferred backward by the conveyor device 35.

In order to attach and detach the punch 15 and the die 19 to and from the punch holder 17 and the die holder 21, an automatic die changing device 37 is attached to the tip end side of the beam member 13 as shown in FIG. Also, many punches for attachment / detachment
A disk-shaped tool magazine 39 is provided on the beam member 13 to house the die of the die 19. The tool magazine 39 is located above the path line along which the workpiece W is moved, and is supported by a rotary shaft 43 that is rotatably suspended from a bearing device 41 mounted on the beam member 13. The tool magazine 39 is provided with a large number of mold holders 45 that can hold the punch 15 and the die 19 as a set.

The tool magazine 39 is constructed so that a desired mold holder 45 can be indexed at a predetermined position by being rotated by an appropriate motor (not shown). And
The die holder 45, when indexed to a predetermined position, can receive the die of the punch 15 and the die 19 from the die automatic exchange device 37 at the predetermined position and the die to the die automatic exchange device 37. It is configured to be handable.

Therefore, the desired mold holder 45 of the tool magazine 39
Is indexed to a predetermined position, and the die automatic changer 37 is appropriately operated, whereby the punch 15 and the die 19 can be exchanged with respect to the punch holder 17 and the die holder 21.

Referring to FIG. 7, the punch holder 17 is punched.
Punch holder 17 so that 15 can be attached and removed automatically
An appropriate punch lock device is provided in the lower part of the.
More specifically, the holder block 47 is integrally attached to the lower end of the punch holder 17 with a plurality of bolts,
The holder block 47 has a locking portion 15L formed by projecting upward from a flange portion 15F provided on the upper portion of the punch 15.
Is formed with a locking hole 49 that can be received from below. As shown in FIG. 8, the locking hole 49 has a V-shaped portion 49V corresponding to the V-shaped abutting side surface 15S formed on the locking portion 15L of the punch 15 and a circular portion 49C. It is formed in a shape connected to the lower part.

A substantially cylindrical lock actuating member 51 is vertically movably fitted into the circular portion 49C of the locking hole 49. A hook member 53 capable of locking the locking portion 15L of the punch 15 is swingably supported via a pin 55 in the lock operating member 51. The pin 55 is supported by the holder block 47 by penetrating a vertically elongated hole 51H formed in the lock operating member 51. Therefore, the lock actuating member 51 can move up and down with respect to the hook member 53.

In order to lock the locking portion 15L in the punch 15, the lower end portion of the hook member 53 is provided with a lateral protruding portion 15P formed on the upper end portion of the locking portion 15L and a disengageable protruding portion 53P. While being formed, an inclined surface portion 53S is formed on the side opposite to the protruding portion 53P. Further, near the upper end portion of the hook member 53, a pin 57 protruding in the same direction as the inclined surface portion 53S side is provided. In order to swing the hook member 53, an inclined surface portion 53S of the hook member 53 and an inclined surface 51S that can be engaged and disengaged are formed at an inner lower end portion of the lock operating member 51, and the pin is provided on an upper side. 57 and a step portion 51ST that can be freely engaged and disengaged are formed. In addition, the lock operating member 51 is a locking portion of the punch 15.
A cutout is formed at a position corresponding to 15L. Further, at the upper end of the lock actuating member 51, a T groove portion 51T engaged with the lower end portion of a piston rod 61 in a fluid pressure cylinder 59 as a drive device for vertically moving the lock actuating member 51.
Are formed.

The fluid pressure cylinder 59 is provided in the punch holder 17, and a lower end portion of the piston rod 61 that can move up and down is formed with a flange portion that engages with the T groove portion 51T. The fluid pressure cylinder 59 is operated by the working fluid supplied and discharged through the flow path 63 formed in the punch holder 17.

In the above configuration, the fluid pressure cylinder 59 is provided via the flow passage 63.
When the working fluid is supplied to the lock actuating member 51 and the lock actuating member 51 is lowered, the inclined surface 51S of the lock actuating member 51 comes into contact with the inclined surface portion 53S of the hook member 53, and the hook member 53 swings counterclockwise in FIG. It will be rotated. Therefore, the protruding portion 53P of the hook member 53 is the locking portion 15L of the punch 15.
Is pressed against the V-shaped portion 49V of the locking hole 49 and the locking portion 1
Acts to push the 5L protrusion 15P upward,
The punch 15 will be fixed to the holder block 47. Therefore, the punch 15 is fixed with the upper surface of the flange portion 15F in surface contact with the lower end surface of the holder block 47. In addition, the hook member 53 serves as the locking portion 15 of the punch 15.
The holder block 47 receives the reaction force when fixing L and the component force in the lateral direction that acts on the punch 15 at the time of nibbling, etc., so that the lock actuating member 51 does not need to be constructed rigidly and is relatively compact. Can be configured into.

Contrary to the above, when the piston rod 61 of the fluid pressure cylinder 59 is operated in the upward direction, the step portion of the lock operating member 51 is
The 51ST comes into contact with the pin 57, the hook member 53 is rotated clockwise in FIG. 7, the fixation of the punch 15 is released, and the punch 15 can be taken out downward.

Further, referring to FIGS. 7 and 8, the holder block 47 is provided with a stripper holder 67 for supporting a stripper 65 surrounding the punch 15. The stripper holder 67 is formed in such a manner that an annular part thereof is cut open for inserting and withdrawing the stripper 65. The stripper holder 67 has a peripheral groove 65 formed on the peripheral surface of the stripper 65.
An arc-shaped support portion 67H that can be engaged with and disengaged from G is formed. Further, the stripper holder 67 is provided with an appropriate number of ball snaps 69 for holding the stripper 67. The stripper holder 67 is supported by a plurality of support pins 71 that are vertically movably supported by the holder block 47, and between the stripper holder 67 and the holder block 47 is a coil spring or the like. Ammo 73 is mounted.

Therefore, when the work piece W is punched by the punch 15, the work piece W is pressed by the stripper 65, and the punch 15 can be reliably pulled out from the work piece W.

The attachment / detachment of the die 19 to / from the die holder 21 is performed by moving the die 19 horizontally with respect to the die holder 21, and the fixing of the die 19 to the die holder 21 is similar to the fixing of the punch 15 described above. However, the description of the detailed configuration will be omitted.

Referring to FIG. 10, the automatic mold changing device 37 includes a gripper G having a first mold changing arm 75 and a second mold changing arm 77. The first mold exchanging arm 75 of the gripper G is for removing the punch 15, the die 19 and the stripper 65 from the punch holder 17 and the die holder 21 and storing them in the mold holder 45 of the tool magazine 39. . Also, the second mold changing arm
Reference numeral 77 is for taking out the punch 15, the die 19 and the stripper 65 housed in the die holder 45 of the tool magazine 39 and mounting them on the punch holder 17, the die holder 21 and the stripper holder 67. As is apparent from FIG. 10, the first and second mold exchanging arms 75 and 77 are arranged with a phase difference of 90 °, and are operably provided to the respective arms.

Since the structure of the first mold exchanging arm 75 and the structure of the second mold exchanging arm 77 are symmetrical, the structure of one of the first mold exchanging arms 75 will be described in the following description. . With respect to the second mold exchanging arm 77, constituent members having the same functions as those of the first mold exchanging arm 75 are designated by the same reference numerals, and detailed description thereof will be omitted.

Referring to FIGS. 1 to 6, the first mold exchanging arm 75 is composed of a punch gripper arm 79 and a die gripper arm 81. The gripper arm for the punch
79 has a bifurcated shape as shown in FIG. 3, and each punch gripper arm 79 is provided with a correction spring 83 and a guide member 85 with a punch arm base as shown in FIGS. 2 and 6. It is installed on 87. That is, the punch gripper arm 79 can move vertically with respect to the punch arm base 87 by the biasing force of the correction spring 83.

The rear end of each punch gripper arm 79 is supported by a punch arm base 87 via springs 89A and 89B, as shown in FIGS. The tip of each gripper arm 79 for punching can be expanded and contracted in the vertical direction in FIG. 3 with the guide member 85 as a fulcrum, and is returned to the original state by the urging force of the strippers 89A and 89B. ing. A claw 91 is provided so as to project from the inside of the tip of each gripper arm 79 for punches, and is for gripping the gripped portion 15H of the punch 15.

The die gripper arm 81 has a bifurcated shape as shown in FIG. 4, and each die gripper arm 81 is attached to a die arm base 95 by a guide bolt 93 as shown in FIGS. 4 and 6. One of the die gripper arms 81, for example, the rear end portion of the upper portion in FIG. 4 is supported by the die gripper arm 81 via a spring 97. Claws inside the tip of each gripper arm 81 for each die
The protrusion 99 is provided for gripping the gripped portion 19H of the die 19.

A holder member 101 is integrally provided at a position above the die gripper arm 81 with respect to the die arm base 95, as shown in FIGS. 1, 2, and 4.
A stripper guide member 103 to be engaged with the circumferential groove 65G of the stripper 65 is integrally provided at a portion of the holder member 101 protruding upward.

As shown in FIG. 1, the die arm base 95 has holes 105 and 107 extending vertically. A vertically movable piston 109 is mounted in the hole 105, and a piston rod 111 extending vertically is integrally provided on an upper portion of the piston 109.
The piston rod 111 has a plurality of bolts 11 on the upper portion of the die arm base 95, as shown in FIGS. 2 and 5.
It protrudes from the cover member 115 attached in 3. Further, the tip end portion of the piston rod 111 is mounted on the punch arm base 87 and is fixed by a nut member 117 from above and below.

Inside the hole 107, a guide rod 1 extending vertically
A fixing member 121 that fixes 19 is provided, and a guide member 123 that guides the guide rod 119 to vertically move the punch arm base 87 is mounted in the punch arm base 87. .

As shown in FIGS. 1 and 3, tracing pieces 125 and 127 are provided on the upper end portions of the punch gripper arm 79 and the die gripper arm 81.

With the above-described configuration, in FIG. 1, by feeding the pressure oil in the flow channels 127 formed on the upper and lower left sides of the die arm base 95, the piston rod 111 descends, and the punch arm base 87 is guided by the guide rod 119. Will be guided to and descend. Further, by feeding pressure oil to the flow path 129 formed on the lower left side of the die arm base 95, the piston rod 111 rises, and the punch arm base 87 is guided by the guide rod 119 and rises. It will be.

When exchanging the die for the punch 15 and the die 19, the condition is that the shut height (height H _{1 in} FIG. ₁ ) is constant, but due to variations in the top dead center in the punch holder 17, The position of the punch 15 from the upper surface of the die holder 21 (height H _{2 in} FIG. 1) becomes indefinite. In that case,
Since the height of the punch arm base 87 can be adjusted by the vertical movement of the piston rod 111, the height of the punch arm base 87 can be adjusted to match the position of the punch 15 with the height of H _2. it can.

Further, since the punch gripper arm 79 that holds the punch 15 by the force of the springs 89A and 89B can move up and down with respect to the punch arm base 87 by the correction spring 83,
The amount of movement sufficiently absorbs the variation in height (H ₁ ) due to the uncertain top dead center of the punch holder 17.

The dies for the punches 15 and the dies 19 are moved to the right in FIG.
When the die holder 21 is mounted, as shown in FIG. 2, the piston rod 111 attached to the punch arm base 87 is lowered, and the piston rod 111 is also dug into the punch holder 17. Then, the piston rod 111 rises and the punch 15 is abutted against the punch holder 17 to fix the punch 15.
At that time, the die 19 is fixed to the die holder 21, and the stripper 65 is fixed to the stripper guide member 103.

Even if the height of the punch holder 17 is not constant, the correction spring 83 of the gripper arm 79 for punching absorbs the height error.

Further, the punch 15 and the die 19 are first shown in FIG.
When the die exchanging arm 75 is moved to be detached from the punch holder 17 and the die holder 21, as shown in FIG. 1, the punch arm base 87 is moved to the piston rod 111.
And then go into the punch holder 17 while still rising. At this time, the follower piece 125 provided at the tip of the punch gripper arm 79 is moved to the position of the punch holder 17 by the correction spring 83, and the positional relationship between the groove of the punch gripper arm 79 and the punch 15 (in FIG. 1). The height H ₄ ) can be kept constant and the punch 15 can be gripped.

Piston rod 111 descends, punch arm base 8
7 holds the punch 15, and the die arm base 95 holds the stripper 65 and the die 19, and they are taken out of the punch holder 17 to complete the exchange of dies.

When the punch 15 is taken out of the gripper arm 79 for punching after processing, if the stop position of the top dead center of the punch holder 17 varies, the distance between the object to be grasped 15H of the punch 15 and the portion to be grasped 19H of the die 19 (see FIG. 1). The height H ₅ ) changes at. However, the gripper arm 79 for punch and the gripper arm for die
Since the interval of 81 is constant, the punch 15 and the die 19 could not be taken out in this state.However, in the present embodiment, the follower piece 125 having a spherical shape or a tapered shape and the correction spring 83 are provided. , The tracing piece 125 is made to follow the slide lower surface 17S, and the punch gripper arm 79 is lowered against the correction spring 83, whereby the punch gripper arm 79 and
The height position of the gripped portion 15H of the punch 15 can be forcibly aligned and can be easily taken out.

Gripper arm for punch 7 instead of the tracing piece 125
By making the tip of 9 taper up and down, the gripper arm 79 for punch is forcibly moved to the gripped portion 15 of the punch 15.
It can also be engaged with H.

In this way, by moving the punch arm base 87, that is, the punch gripper arm 79 up and down, the position of the punch holder 17 can be corrected, so that die replacement is possible without requiring a large-scale device. It can be done easily.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, although the punch arm base 87 is vertically movable in the present embodiment, the die arm base 95 may be vertically movable.

[Effects of the Invention] As will be understood from the above description of the embodiments, according to the present invention, since the configuration is as described in the claims of the patent, even if the shut height is not constant,
Since one of the gripper arm for punch and the gripper arm for die is provided so that the height position can be adjusted with respect to the arm base, by adjusting the height position of one arm, one gripper arm holds one gripper arm. The gripper arm is engaged and gripped by the other part, and the other gripper arm is engaged and gripped by the other gripped part as it is. Thus, the punch and the die respectively provided in the punch holder and the die holder are held by the respective gripper arms, and the operation is simple and can be easily replaced.

[Brief description of drawings]

1 and 2 are front cross-sectional views of an exchanging arm of an automatic die exchanging device showing a main part of the present invention. FIG. 1 shows a state in which a punch arm base is raised, and FIG. 2 shows a punch arm. It shows a state in which the base is lowered. 3 is a view on arrow III in FIG. 1, FIG. 4 is a view on arrow IV in FIG. 1, FIG. 5 is a view on arrow V in FIG. 1, and FIG. 6 is a view on arrow VI in FIG. It is a figure. FIG. 7 is an enlarged cross-sectional view taken along the line VII in FIG. 9, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 9 is a side view of a punch press equipped with a die automatic changer embodying the present invention, and FIG. 10 is a plan view of FIG. 15 …… Punch 17 …… Punch holder 19 …… Die 21 …… Die holder 71 …… First die changing arm 79 …… Punch gripper arm 81 …… Die gripper arm 87 …… Punch arm base 95 …… Die arm base 109 …… Piston 111 …… Piston rod

Claims (1)

(57) [Claims] 1. A punch holder and a die holder coaxially arranged are provided with a punch and a die which are exchangeable and have a grasped portion, and a punch, a die gripper arm for the punch and a die for simultaneously exchanging the punch and the die. An automatic die changer equipped with a grip consisting of a base is provided, and either one of the grip gripper arm for the punch and the gripper arm for the die of the grip is height-adjustable with respect to the arm base, and the gripping arm of the one is adjusted. A punch press equipped with an automatic mold changing device, wherein the other arm is engageable with the other grasped portion as it is while being engageable with the grasping portion.