JPH06297053A - Passing cutting method and die - Google Patents

Abstract

PURPOSE:To execute the cutting or the working of a long size slit without generating a joint, to smoothly discharge chip and to form a die with a simple structure. CONSTITUTION:A punch 1 having a punching blade part 3 highly forming its projecting height and a lowly formed notching blade part 4 mutually via a step part 5 is used. A die 2 having a punching penetrating hole 6 where each of the punching blade part 3 of the punch 1 and the notching blade part 4 is invaded and a notching recessed part 7 is used. After a metal plate W is notched with the punching action by using this punch 1 and the die 2, the metal plate W is fed so as to position the notched chip Wa on the punching penetrating hole 6 of the die 2. In the next punching action, the notched chip Wa is cut with the step part 5 and a new notching is executed succeeding the notching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching cutting method and a die for forming a continuous punching hole in a plate material.

[0002]

2. Description of the Related Art When a plate material is cut using a punch press or when a long slit is formed, a long-angle punch is usually used as a mold and a large number of punch holes are continuously formed. Is taken. However, with this processing method,
There is a problem that a seam is formed on the cut surface of the plate material between the continuously formed punch holes.

As a punching method for eliminating such a seam, a punch having a slanted tip surface is used, and only a cut is made without punching a plate material, and the next cut is continued after the previous cut. The method of doing is proposed. According to the processing method in which the cuts are sequentially made in this manner, the cut surface is continuously and neatly finished. However, this method has a problem in that it is difficult to discharge since scraps are continuously generated.

In order to solve these problems, the punch is divided into a punching blade portion and a cutting blade portion, and the plate material is continuously cut, and a cutting piece is formed for each punch. A mold that cuts a part of the mold has been proposed. Also, 1
Also proposed is one in which a punching blade portion with a flat tip surface and an oblique cutting blade portion are continuously provided on each punch, and the continuous formation of the above-mentioned cutting and the cutting of the cutting piece are simultaneously performed. Has been done.

[0005]

However, in the case where the punch is divided into two blade portions, there is a problem that the structure of the punch becomes complicated. Further, in the case where the punching blade portion and the cutting blade portion are continuously provided in one punch as described above, the cutting piece is formed at the edge portion between the punching blade portion and the cutting blade portion. To be able to cut, punches and dies require a high degree of precision.

An object of the present invention is to provide a punching and cutting method and a die which can perform cutting and processing of long slits without producing joints, can smoothly discharge punched waste, and have a simple die structure. It is to be. Another object of the present invention is that the cutting piece is not caught on the inner surface of the die,
An object of the present invention is to provide an overtaking cutting method and a die that can smoothly feed a plate material.

[0007]

The punching and cutting method according to the present invention has, as a punch, a punching blade portion having a high protrusion height and a cutting blade portion having a low protrusion height via step portions. Use one. As the die, one having a punching through hole into which the punching blade portion and the cutting blade portion of the punch enter and a recessing portion for cutting is used. Using such a punch and a die, a plate material is processed into two cuts along both sides of the punch, and then the plate material is placed so that the cut piece between the two cuts is located on the punching through hole of the die. Send. In the next punching operation, cutting of the cut piece by the step portion and machining of a new cut following the cut are performed.

The feeding of the plate material may be carried out after the cutting piece which has been fitted into the cutting recess of the die by the cutting process is returned to the upper surface of the die. Also, make the length of the recess for cutting of the die sufficiently longer than the through hole for punching, and make the feed amount of the plate material feed during each punching operation slightly shorter than the length of the through hole for punching. Is desirable.

The punching die of the present invention comprises a punch and a die having the following constitution. The punch has a punching blade portion and a cutting blade portion which are aligned with each other. The punching blade portion is formed to have a higher protruding height than the cutting blade portion via the step portion. The cutting blade portion has a slope such that the protruding height decreases in the direction away from the punching blade portion. The die has a punching through hole and a cutting recess into which the punching blade and the cutting blade of the punch enter, and the side adjacent to the punching through hole on the bottom of the cutting recess is cut. It shall be the edge.

The die may have an extrusion mechanism for returning the cut piece of the plate material to the upper surface of the die in the cut recess. Further, in the die, it is desirable that the length of the recess for cutting is sufficiently longer than that of the through hole for punching. The punching blade portion of the punch may have a slope such that the protruding height increases in the direction away from the cutting blade portion. Further, the die is provided on the bottom surface of the cutting recessed portion so as to be able to move up and down so as to overlap substantially the entire bottom surface, and the side adjacent to the punching through hole of the die on the top surface of the pressing member is the cutting edge, In addition, a return spring that biases the pushing member upward may be provided.

[0011]

According to this punch-out cutting method and die, the cuts are successively processed by each punching operation, and the cut pieces generated by the cutting are cut during the punching operation. Therefore, it is possible to eliminate the occurrence of a seam on the punching cut surface, and the cut piece that becomes the scrap is cut into pieces, and the discharge is smoothly performed. Since the cutting piece is cut at the step portion of the punch, even if there is a slight error in the height accuracy of the punch, reliable cutting is performed.

When the cutting piece pushing mechanism is provided in the cutting recess of the die, the plate material can be fed while the cutting piece is returned to the upper surface of the die, so that the cutting piece moves along with the feeding operation. It can be fed smoothly without being caught on the inner surface of. If the length of the cutting recess of the die is made sufficiently longer than the punching through hole, the cutting can be made longer, so the cutting piece does not have a steep slope, and the seam of the punching cut surface is further improved. It is hard to occur.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This punching cutting die comprises the punch 1 and the die 2 shown in FIG. In the punch 1, the blade portion 1a has a rectangular cross-section, and the tip of the blade portion 1a is formed with a punching blade portion 3 and a cutting blade portion 4 which are arranged side by side in the width direction. The punching blade portion 3 is formed to have a protruding height H higher than that of the cutting blade portion 4 via the step portion 5 and has a slope a in which the protruding height becomes higher in a direction away from the cutting blade portion 4. ing. It is assumed that the cutting blade portion 4 has a slope b whose projection height decreases in the direction away from the punching blade portion 3. Each of the gradients a and b is set to about 10 °, for example. The tip surfaces of the blade portions 3 and 4 do not necessarily have to be straight, but may have a curved slope a,
b may be formed. Further, the punching blade portion 3 may not be provided with the gradient a. The width dimensions A and B of the punching blade portion 3 and the cutting blade portion 4 are approximately the same as each other.

The die 2 is of a cylindrical shape having an upper surface plate portion 2a (see FIG. 2), and the punching blade portion 3 and the cutting blade portion 4 of the punch 1 respectively enter the upper surface plate portion 2a. The extraction through hole 6 and the notch 7 are formed in a slit shape adjacent to each other. The length D of the notch recess 7 is sufficiently longer than the length C of the punching through hole 6. Bottom wall 7 of recess 7 for cutting
a is a stepped portion 5 of the punch 1 on the side adjacent to the punching through hole 6.
Is formed on the cutting edge 7b corresponding to. In addition, the notch recess 7 has two opposing opening edges 7c and 7c (FIG. 2) opened on the upper surface of the upper surface plate portion 2a as notch forming edges, and the end opening edge 7d is a smooth corner portion. There is. The punching through hole 6 has the opening edges 6a and 6b opened on the upper surface of the upper surface plate portion 2a as cutting edges.

FIG. 3 shows an example of a support structure for the punch 1. The punch 1 is attached to the punch holder 10 with a set bolt 11, and the punch holder 10 is fitted in a mold installation hole 14 of a turret 13 via a guide 12 so as to be able to move up and down. The punch holder 10 engages with a ram 17 of a slide drive mechanism (not shown) by its T-shaped head and is driven up and down. By this elevating drive, the punch 1 moves up and down from the upper end position shown by the solid line in FIG. 1 (B) to the lower end position shown by the chain line. The slide drive mechanism may be a crank type or a hydraulic type. The guide 12 is movable up and down and is biased downward by a pressing spring 15, and a stripper plate 16 is attached to the lower end.

Next, a punching and cutting method using the above mold will be described. FIG. 4 shows a case where the plate material W is cut from the middle thereof. The punch 1 descends from the upper end position of FIG. 1A to the lower end position of FIG. 1B, punches a part of the plate material W with the punching blade portion 3 and cuts the plate material W with the cutting blade portion 4. To process the glue. The cuts are parallel to each other on both sides of the cutting blade 4.
The cut piece Wa formed between the two cuts is in an inclined state along the lower surface of the cut blade portion 3a. The punched piece Wb drops in the die 2 and is discharged.

When the punch 1 rises (FIG. 2C), the plate material W is fed so that the cutting piece Wa is positioned on the punching through hole 6 (FIG. 2D), and the next punch is formed. In the descending operation of 1 ((E) in the figure), the cut piece Wa is cut and a new cut following the cut is processed. Wa ₂ indicates a newly formed cut piece. In this case, when the width dimension C of the punching through hole 6 is about 15 mm, for example, the feed amount is about 12 mm, and the plate material is fed in a length range of a part of the processed cutting piece Wa. Try to disconnect. By repeating such an operation, the plate material W is cut, or a long slit is formed in the plate material W.

According to this punch-out cutting method, the cuts are continuously processed by each punching operation in this way, and the cut pieces Wa produced by the cuttings are cut during the punching operation. Therefore, it is possible to eliminate the occurrence of a seam on the cut-out cutting surface, and the cutting piece Wa that is the scrap is cut off, so that the discharge is smoothly performed. Notch W
Since the cutting of a is performed at the step portion 5 of the punch 1, even if there is a slight error in the height accuracy of the punch 1, reliable cutting is performed.

Further, the length D of the recess 7 for cutting of the die 2 is made sufficiently longer than the length C of the through hole 6 for punching, and the feeding amount of the plate material W for each punch is set as described above. Since the cutting piece Wa is formed short, the cutting piece Wa can be formed long, and the cutting piece Wa does not have a steep slope, which also makes it more difficult for the seam of the overcutting cut surface to occur.

5 and 6 show another embodiment. In this example, an extrusion mechanism 20 is provided in the cutting recess 7 of the die 2 '. The extrusion mechanism 20 has a vertical hole 21 formed in the die 2 '.
The pressing member 22 partially protrudes from the pressing member 22, and the return spring 23 biases the pressing member 22 to project. The vertical hole 21 has an upper end formed in a long hole-like opening 21a having the same width as the recess 7 for cutting, a lower part formed in a circular hole 21b, and a female screw portion at the lower end for supporting the return spring 23 with a screw. The lid 24 is screwed on. The pushing member 22 includes a standing piece portion 22a that is fitted into the long hole-shaped opening 21a so as to project and retract, and a disc-shaped stopper portion 22 below the standing piece portion 22a.
b and a shaft portion 22c, and the spring 23 reaches a position where the stopper portion 22b engages with the upper end of the circular hole portion 21b of the vertical hole 21.
It is urged to project. Reference numeral 25 is a positioning hole for the die 2 ', and 26 is a cut waste discharging hole. Other configurations of the die 2'and the punch 1 are similar to those of the example of FIG.

When this die 2'is used, the cutting piece Wa is returned as shown in FIG. That is,
As shown in FIG. 6 (A), when the punch 1 is lifted after lowering the punch 1 to cut the cutting piece Wa and form a new cut, the pressing member 22 is moved by the elastic restoring force of the return spring 23. The cutting piece Wa that has risen and has entered the cutting recess 7
Is pushed back to the upper surface of the die as shown in FIG. In this state, the plate material W is fed as shown in FIG. Therefore, when the plate material W is fed, the cutting piece Wa is not caught on the inner surface of the die 1, and smooth feeding can be performed. Other operations are the same as those in the above embodiment. In the example of FIG. 6, the pushing mechanism 20 may be made of an elastic body such as rubber.

FIG. 7 shows still another embodiment. In this example, a pushing member 22 'constituting the pushing mechanism 20 of the die 2'is provided.
Is formed so as to overlap substantially the entire bottom surface of the cutting recess 7, and the side adjacent to the punching through hole 6 on the upper surface of the pressing member 22 'is a cutting edge 7b'. Push member 22 '
Is composed of a plate-shaped member having a T-shaped side surface, is fitted in a flat vertical hole 27 in the die 2 ′ so as to be able to move up and down, and is biased by a return spring 23. A bottom lid 28 is attached to the die 2 ′ with a fixing bolt 29, and penetrates the bottom lid 28 to push the pushing member 2
The stopper bolt 30 screwed to 2'is engaged with the bottom lid 28, whereby the rising end of the pressing member 22 'is regulated.
In the figure, the pressing member 22 ′ is shown in a state of being pressed down by the punch 1. In the punch 1, the lower end of the punching blade portion 3 is horizontally formed. Even in the case of such a configuration, the plate material is fed in the state where the cut piece Wa is pushed back to the upper surface of the die as in the embodiment of FIG.

In each of the above-described embodiments, the case where the punching cutting is performed from the middle of the plate material W has been described, but the punching cutting may be performed from the end of the plate material W.

[0024]

According to the punching and cutting method and the die of the present invention, as punches, there are punching blade portions formed to have a high protruding height and stepping blade portions formed to have a low protruding height. Using a die that has punching through holes and cutting recesses into which the punching and cutting blades of the punch enter, so that the punching is performed continuously with each punching operation. However, the cut piece is cut during the punching operation. Therefore, it is possible to eliminate the occurrence of a seam on the cut-out cutting surface, and the cut piece serving as punching scrap is cut into pieces to be smoothly discharged. In particular, since the cutting piece is cut at the step portion of the punch, reliable cutting can be performed even if there is a slight error in the height accuracy of the punch.

In the case where the cutting piece pushing mechanism is provided in the cutting recess of the die, the plate material can be fed with the cutting piece returned to the upper surface of the die. It can be fed smoothly without being caught on the inner surface of. If the length of the cutting recess of the die is made sufficiently longer than the punching through hole, the cutting can be made longer, so the cutting piece does not have a steep slope, and the seam of the punching cut surface is further improved. It is hard to occur.

[Brief description of drawings]

FIG. 1A is a cutaway side view of a punching die according to an embodiment of the present invention, and FIG. 1B is an operation explanatory view showing a part of the die in an enlarged manner.

FIG. 2 is a plan view of a die in the mold.

FIG. 3 is a cross-sectional view showing an example of a peripheral structure that supports a punch.

FIG. 4 is an operation explanatory diagram.

5A to 5C are a plan view, a cross-sectional view, and a bottom view of a die according to another embodiment, respectively.

FIG. 6 is an operation explanatory diagram of the embodiment.

FIG. 7 is a cutaway side view of a punching die and a plan view of its die according to still another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Punch, 1a ... Blade part, 2, 2 '... Die, 3 ... Punching blade part, 4 ... Cutting blade part, 5 ... Step part, 6 ... Punching through hole, 7
... cutting concave portion, 7a ... bottom plate portion, 7b ... cutting edge, 10
... punch holder, 13 ... turret, 17 ... ram, 20 ...
Extrusion mechanism, 22 ... Pushing member, 23 ... Return spring, W ... Plate material,
Wa ... Cut piece

Claims (8)

[Claims] 1. A punch having a punching blade portion formed to have a high protruding height through a step portion and a cutting blade portion formed to have a low height, and the punching blade portion and the cutting blade portion are respectively formed. After processing two notches along both sides of the punch in the plate material, using a die having a through hole for punching and a recess for notching to enter,
The plate material is fed so that the notch between the two notches is located on the punching through hole of the die, and the next notch cuts the notch by the step portion and a new one following the notch. Overtaking cutting method that performs cutting and processing. 2. The punching-out cutting method according to claim 1, wherein the plate material is fed after the cutting piece which has been fitted into the cutting recess of the die by the cutting process is returned to the upper surface of the die. 3. The length of the cutting recess of the die is made sufficiently longer than that of the punching through hole, and the feed amount of the plate material feeding during each punching operation is slightly longer than the length of the punching through hole. The overtaking cutting method according to claim 1 or 2, wherein the cutting is shortened. 4. The punch blade portion includes a punching blade portion and a cutting blade portion arranged in a wide direction, and the punching blade portion is formed to have a higher protruding height than the cutting blade portion through a step portion. The cutting blade has a slope such that the protruding height decreases in the direction away from the punching blade,
The die has a punching through hole and a cutting recess into which the punching blade and the cutting blade of the punch enter, and the side adjacent to the punching through hole on the bottom of the cutting recess is cut. An overtaking cutting die that becomes an edge. 5. The punching die according to claim 4, wherein the die cutting recess is provided with an extruding mechanism for returning a cutting piece that has been fitted into the recess by the cutting process to the upper surface of the die. 6. The punching die according to claim 4, wherein the length of the cutting recess of the die is sufficiently longer than that of the punching through hole. 7. The punch-through cutting die according to claim 4, wherein the punching blade portion of the punch has a slope such that the protruding height becomes higher in the direction away from the cutting blade portion. 8. A pressing member overlapping substantially the entire bottom surface of the die of the die according to claim 4 is provided on the bottom surface of the cutting recess so that the pressing member can be moved up and down. A punch-out cutting die having a cutting edge on the side adjacent to the hole and provided with a return spring for urging and pushing up the pressing member.