JPH10156597A - Variable type press die construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight of a packing plate by forming a die into a separated construction and a part thereof into a common part, further, to make a die changeable from a front of a press by forming a die into a magazine type, to make centering easy, to reduce a mounting time, and to standardize design. SOLUTION: The die is constructed so that a punch holder 20 fixed to a ram 1 and a die holder 21 fixed to a bed 3 are formed to a planar U shape with opening each font face. By this method, an upper cushion insert 26 to support an upper die 2 is attachably/detachably inserted in the inside from a front face opening part of the punch holder 20 and a lower part cushion insert 33 to support a lower die 4 is attachably/detachably inserted in the inside from a front face opening part of the die holder 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable press die structure in which a part of the die structure is made variable to facilitate replacement.

[0002]

2. Description of the Related Art In a conventional press die structure, for example, in the case of a drawing die, an upper die 2 is mounted on a ram 1 and a lower die 4 is mounted on a bed 3 as shown in FIG. The drawn metal plate 5 is pressed between the upper die 2 and the lower die 4 and drawn.

[0003] The structure of the conventional upper die 2 is a punch holder 7.
A punch backing plate 8 is attached to the bottom, and a punch 9 is joined to this bottom surface. A punch strip plate 10 is provided around the punch 9, and is connected to a movable pin 11 movably penetrating the punch backing plate 8. An upper portion of the movable pin 11 is inserted inside the punch holder 7. It is always elastically pushed down by the attached spring 12.

The lower die 4 has a die backing plate 16 joined to a die holder 14 mounted on the bed 3 and a frame-shaped die plate 17 mounted thereon. A die strip plate 18 is provided inside the die plate 17, and is connected to a movable pin 11 movably penetrating the die backing plate 16. A lower part of the movable pin 11 is inside the die holder 14. , Is constantly elastically pushed upward by a spring 12 inserted therein.

In the above-described conventional mold structure, when the metal plate 5 is placed on the lower die 4 and the ram 1 descends, first, the punch strip plate 10 causes the metal plate 5 to die by the elastic force of the spring 12. Press on the plate 17 to fix the position. When the ram 1 further descends, the punch 9 moves to the metal plate 5.
In the process of being inserted into the frame-shaped die plate 17,
The metal plate 5 is drawn into a box shape. Thereafter, when the upper die 2 rises, the lowered die strip plate 18 is pushed up by the elastic force of the spring 12, and the drawn product is pushed out from the inside of the die plate 17.

The conventional mold structure includes a punch 9 to which a load is applied.
Since the punch backing plate 8 and the die backing plate 16 are processed from a thick metal block in order to support the die plate 17 and the die plate 17, there is a problem that the weight of the mold is heavy and the material cost is high. Further, in the conventional mold, since the whole mold is designed and manufactured for each product to be molded, there is a problem that it takes time from ordering to manufacturing, and the manufacturing cost is increased. In addition, the weight of the mold is heavy, and particularly when the upper mold 2 is mounted on the ram 1, there is a problem that it takes time and labor to mount the upper mold 2, center the center (position the center), and remove the work.

[0007]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, divides the mold into divided parts, reduces the weight of the backing plate by making a part thereof a common part, and forms a magazine for replacement from the front. In addition, the present invention provides a variable press die structure capable of greatly shortening the period from ordering to manufacturing since the centering is easy, the mounting time is shortened, and the design can be standardized.

[0008]

According to a first aspect of the present invention, there is provided a variable press die structure comprising a punch holder fixed to a ram and a die holder fixed to a bed, each of which has a flat front opening. An upper cushion insert supporting the upper mold is formed in a U-shape, and the upper cushion insert supporting the upper mold is removably inserted into the punch holder from the front opening thereof. It is characterized by being detachably inserted into the inside from the front opening.

Further, in the mold structure of the present invention, the upper and lower cushion inserts are constituted by combining a fixed plate and a movable plate, and the movable plate is elastically supported by a spring or a cylinder, and protrudes from the fixed plate. Wherein the reinforcing pin extends through the movable plate to support an upper or lower backing plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described in detail with reference to FIG. In the figure, reference numeral 20 denotes a punch holder fixed to the ram 1 and reference numeral 21 denotes a die holder fixed to the bed 3. The punch holder 20
As shown in FIG. 2, is formed in a flat U-shape with an open front surface, a step portion 22 is formed on the left and right inner wall surfaces, and a spherical stopper 23 is provided on the upper surface so as to be able to protrude and retract. Further, clamps 24, 24 are mounted on the left and right bottom surfaces of the punch holder 20, respectively.

The die holder 21 is also formed in a flat U-shape with an open front surface, and a step portion 22 is formed on the left and right inner wall surfaces, and a spherical stopper 23 is provided on the upper surface so as to be able to protrude and retract. In addition, clamp 2
4, 24 are installed.

Reference numeral 26 denotes an upper cushion insert, which elastically supports a movable plate 29 via a plurality of springs 12 on the bottom surface of a fixed plate 27 as shown in FIG. A plurality of projecting reinforcing pins 30 penetrate the movable plate 29. The upper die 2 has a structure in which a punch 9 is connected to the bottom surface of a punch backing plate 8.
Is in contact.

A punch strip plate 10 is provided around the punch 9 of the upper die 2 so as to surround the punch 9. A movable pin 11 connected to the upper surface of the punch strip plate 10 movably penetrates the punch backing plate 8 so as to be movable. It is in contact with the movable plate 29 of the insert 26. The punch backing plate 8 of the upper die 2 is fixed to the bottom surface of the punch holder 20 by clamps 24,24.

Reference numeral 33 denotes a lower cushion insert, which is provided with a movable plate 29 on the upper surface of a fixed plate 27,
A plurality of reinforcing pins 30 projecting from the upper surface of the movable plate 29
Penetrates. A die strip plate 18 is provided inside the die plate 17 of the lower die 4, and the movable pin 11 connected to the bottom surface movably penetrates the die backing plate 16 to move the movable plate 29 of the lower cushion insert 33.
Is in contact with the upper surface of the Further, a cylinder 13 attached to a press machine is provided in the bed 3, and the tip protrudes from the upper surface of the bed 3 as necessary, penetrates the fixing plate 27 of the lower cushion insert 33, and contacts the bottom surface of the movable plate 29. contact,
The movable plate 29 is elastically supported. The die backing plate 16 of the lower die 4 includes a clamp 24,
24 fixes it to the upper surface of the die holder 21.

When the variable press die structure having the above structure is mounted on the press, first, as shown in FIG. 2, the upper cushion insert 26 is inserted through the front opening of the punch holder 20 formed in a flat U-shape with the front opening. Insert and position with spherical stopper 23. The bed 3 is placed in a state in which the die holder 21 is stacked under the punch holder 20 and connected integrally.
Position and fix on top. Next, the lower cushion insert 33 is inserted from the front opening of the die holder 21 formed in a flat U-shape having a front opening.

Next, the ram 1 is lowered as shown in FIG.
After connecting the punch holder 20 to the ram 1, the ram 1 is raised. Thereafter, the mold set in which the upper mold 2 and the lower mold 4 are combined is placed on the die holder 21, and then the ram 1 is lowered again, and the upper cushion insert 26 is stacked on the upper mold 2. Next, both sides of the punch backing plate 8 of the upper mold 2 are tightened with clamps 24, 24, and the upper mold 2 is punched.
Fix to 20. Thereafter, both sides of the die backing plate 16 of the lower mold 4 are tightened with clamps 24,
Fixed to Next, the tip of the cylinder 13 attached to the bed 3 is raised, and this is brought into contact with the bottom surface of the movable plate 29 of the lower cushion insert 33 to elastically support the movable plate 29 in the vertical direction.

After that, the ram 1 is raised, and the metal plate 5 is inserted between the upper die 2 and the lower die 4 and placed on the die plate 17. Next, when the operation switch is turned on, the ram 1 descends, and first, the punch strip plate 10 presses and fixes the metal plate 5 on the die plate 17. When the ram 1 further descends, only the punch 9 descends to the inside of the die plate 17, and the metal plate 5 during this time is drawn. At this time, the punch backing plate 8 which receives the load applied to the punch 9 has its upper surface supported by the fixing plate 27 of the upper cushion insert 26 with a plurality of reinforcing pins 30. The plate thickness can be made thinner than the conventional punch backing plate 8 shown in FIG.

Similarly, the bottom surface of the die backing plate 16 which receives the load applied to the die plate 17 of the lower mold 4 is supported by the fixing plate 27 by the plurality of reinforcing pins 30 of the lower cushion insert 33. The support strength is high as a whole, and the plate thickness can be made thinner than the conventional die backing plate 16.

As described above, when the ram 1 descends to the lowest point and rises again, the cylinder 13 attached to the press machine extends, and the movable plate 29 of the lower cushion insert 33 rises, and the movable plate 29 moves. The die strip plate 18 connected via the pins 11 rises, and the product molded in the die plate 17 is discharged.

When replacing the mold, the upper mold 2 and the lower mold 4 are combined, then the clamps 24, 24 are released and removed, and another mold is mounted. As described above, in the present invention, the upper mold 2 and the lower mold 4 can be reduced in weight by employing a structure in which the mold is separated into the holder and the cushion insert. In addition, since the punch holder 20 and the die holder 21 are not removed while being attached to the press machine, the positioning work of the upper and lower cushion inserts 26 and 33, the upper mold 2, the lower mold 4 and the like becomes easy, and the mold replacement work is about 55%. In seconds, the workability was greatly improved as compared with the conventional integrated type shown in FIG. 6 which took about 15 minutes.

Also, when replacing the upper cushion insert 26 and the lower cushion insert 33, the punch holder 20 and the die holder 21 are formed in a flat U-shape with an open front, so that the punch holder 20 and the die holder 21 are pulled out from the front opening in a magazine manner. , Can be easily replaced simply by insertion, and positioning is also easy.

FIGS. 3 and 4 show another embodiment of the present invention in the case of drilling. The punch holder 20 attached to the ram 1 and the upper cushion insert 26 inserted inside this are the same as in FIG. Further, the upper die 2 attached here has a punch 9 in the form of a pin, and the tip of the punch 9 penetrates through the round holes 36 of the punch strip plate 10 so as to be freely protruded and retracted. A reinforcing plate 38 having the structure shown in FIG. 4 is inserted above the step 22 inside the die holder 21 attached to the bed 3 as it is. This reinforcing plate 38 is formed in a square frame shape provided with a hollow portion 39. As shown in FIG. 3, the lower die 4 is provided with a circular groove 40 extending vertically in the die plate 17 and the die backing plate 16 corresponding to the pin-shaped punch 9 of the upper die 2. .

In the case of drilling with this mold structure, first, the metal plate 5 is inserted and placed on the die plate 17. Next, when the ram 1 is lowered, the punch strip plate 10 presses the metal plate 5 onto the die plate 17 to fix it. When the ram 1 is further lowered, the pin-shaped punch 9 punches the metal plate 5 to form the die plate. Descend inside 17. Die plate 17 and die backing plate 16
From the round groove 40 of the bed 3 through the hollow portion 39 of the reinforcing plate 38
Fall on.

At this time, since the bottom surface of the die backing plate 16 which receives the load applied to the die plate 17 of the lower die 4 is supported by the reinforcing plate 38 having a large thickness, the supporting strength is high as a whole, and the conventional die The plate thickness can be made thinner than the backing plate 16. The upper cushion insert is also used when changing to a different punching die.
The work is easy because only the upper mold 2 and the lower mold 4 need to be replaced with the 26 inserted into the punch holder 20 and the reinforcing plate 38 still inserted into the die holder 21. If several kinds of reinforcing plates 38 are prepared, it is possible to correspond to the shape of many lower dies 4. In the above description, the spring 12 is used to elastically support the movable plate 29 of the upper cushion insert 26.
Although the case where is used is shown, a structure using an air cylinder which can easily adjust the pressure may be used.

As described above, according to the present invention, the punch holder 20
And die holder 21 are used in common, and the upper cushion insert 26 and lower cushion insert 33
If several types of reinforcing plates 38 are prepared as common parts, the upper die 2 and the lower die 4 may be formed according to the product shape to be molded.
You only need to create. Fig. 5 is a standardized design drawing.
At 41, this design drawing 41 shows the punch 9, the punch backing plate 8, the die plate
17, common to the die backing plate 16, etc.
A guide post position 42, a workable range 43, and the like are printed on the design drawing 41 in advance. Products having a product size falling within this range can be designed in a short time, and if a metal plate corresponding to the design drawing 41 is prepared in advance, the processing time of the mold can be reduced.

[0026]

As described above, according to the variable press die structure of the present invention, the upper die has a combination split structure of the punch holder and the upper cushion insert, and the lower die also has the die holder and the lower cushion. It has a combined disassembly structure with an insert or a reinforcing plate, and the punch holder is fixed to the ram and the die holder is fixed to the bed, so it is necessary to replace the mold manufactured according to the pressed product, Only the upper and lower cushion inserts or reinforcing plates previously manufactured as common parts need to be replaced, and the replacement work is lightweight and easy.

Since the punch holder fixed to the ram and the die holder fixed to the bed are formed in a flat U-shape with an open front surface, only the upper and lower cushion inserts or reinforcing plates can be pulled out and replaced in a magazine type. Therefore, centering is easy and setup time can be greatly reduced.

Further, a cushion insert is provided on the back surface of the backing plate on which the mold is mounted, and the backing plate is supported by the fixing plate with the reinforcing pins of the cushion insert. The thickness can be reduced.

Further, since the design drawings are standardized in accordance with the upper and lower cushion inserts and reinforcing plates which have been manufactured in advance as common parts, the mold can be designed based on the design drawings, and the material can be prepared in advance. . As a result,
The period from ordering to product production can be greatly reduced, and the die manufacturing cost can be reduced by 30 to 50%, which is extremely effective when manufacturing a large number of types of press-formed products in small quantities.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a variable press die structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a punch holder, upper and lower cushion inserts, a mold, and a die holder shown in FIG. 1;

FIG. 3 is a cross-sectional view of a variable press die structure for punching according to another embodiment of the present invention.

FIG. 4 is a perspective view of the reinforcing plate shown in FIG.

FIG. 5 is a plan view showing a standardized design drawing.

FIG. 6 is a cross-sectional view showing a conventional press die structure.

[Description of sign]

 1 Ram 2 Upper die 3 Bed 4 Lower die 5 Metal plate 7 Punch holder 8 Punch backing plate 9 Punch 10 Punch strip plate 11 Movable pin 12 Spring 13 Cylinder 14 Die holder 16 Die backing plate 17 Die plate 18 Die strip plate 20 Punch holder 21 Die holder 24 Clamp 26 Upper cushion insert 27 Fixed plate 29 Movable plate 30 Reinforcement pin 33 Lower cushion insert 38 Reinforcement plate 41 Design drawing

Claims (2)

[Claims] 1. A punch holder fixed to a ram and a die holder fixed to a bed are each formed in a flat U-shape having an open front surface, and an upper cushion insert for supporting an upper die is provided on the punch holder. A variable press, wherein a lower cushion insert or a reinforcing plate which is detachably inserted into the inside from the front opening and supports the lower mold is detachably inserted into the inside from the front opening of the die holder. Mold structure. 2. An upper and lower cushion insert comprising a combination of a fixed plate and a movable plate, wherein the movable plate is elastically supported by a spring or a cylinder, and reinforcing pins protruding from the fixed plate are provided on the movable plate. 2. The variable press die structure according to claim 1, wherein the upper and lower backing plates are supported by passing through the through hole.