JPH06154901A - Ripping metallic die - Google Patents

Abstract

PURPOSE:To provide a ripping metallic die which can execute ripping for generating no trace of a triangular shape caused by the generation of droop, at the time of ripping, and also, can execute, easily the processing of slug generated at the time of ripping. CONSTITUTION:In the metallic die used for ripping executed by a press, the cross section shape of the lower part of a punch P is formed in a rectangular shape, and on the front edge side in the relative advance direction of a plate W to a punch P, a front side lower end cutting edge part 71 protruded in the lower direction is provided, a rear side upper end cutting edge part 73 for cutting down slug Wa from the plate W is formed in a higher position than the front side lower end cutting edge part 71, and the front side lower end cutting edge part 71 and the rear side upper end cutting edge part 73 are connected by a concave curve-like intermediate cutting edge part 75 in order to form the slug in a spiral shape. Also, the back draft part 77 of a die D corresponding to the punch P is formed in an inverted conical shape in order to prevent foreign matter from being caught.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for post-cutting processing for performing post-cutting processing on a plate material.

[0002]

2. Description of the Related Art Conventionally, when a plate material is subjected to slotting or cutting using a mechanical press such as a turret punch press, the cross-sectional shape of the punch edge, which is a die, is almost rectangular or rectangular. Single punching was continuously performed using a punch in which the corners of the shape were chamfered with relatively large arc-shaped curves.

That is, conventionally, for example, Japanese Patent Publication No. 55-9.
As described in Japanese Unexamined Patent Publication No. 248 (hereinafter, simply referred to as a prior art example), a punching hole having a size larger than a plane shape of a punch is machined by reducing a feeding pitch of a plate material with respect to the punch and performing continuous punching. Is being done.

In the above-described prior art example, a punch projecting downward is formed at one end (one corner) of a punch having a rectangular cross section, and the punch is engaged in a hole to form the punch. By moving the plate material using the side surface of the protruding portion as a guide to continuously perform punching, a step is not formed on the side of the hole where punching is continuous.

As shown in the prior art, in the structure in which the protrusion is formed at one end (one of the four corners) of the rectangular punch, the punch residue is continuously drawn. It is impossible to carry out the post-cutting processing that occurs.

[0006]

By the way, when a square hole is punched in a plate material W by a punch and a die,
As shown in FIG. 6, sagging D is generated on each side of the hole H on the upper surface of the plate material W, and triangular portions S are formed at four corners between the sagging D adjacent to each other as no sagging D. Therefore, as shown in FIG. 6 (C), when the punch is slightly displaced and the holes H1, H2, ... Are continuously punched in succession to the hole H, the side L of the entire hole has no step. Although it can be continuously formed, the triangular portion S is formed along the side L.

The present invention has been made in view of the conventional problems as described above, and it is an object of the present invention to provide a die for overcutting processing which can perform overcutting processing without producing the triangular portion. is there.

[0008]

SUMMARY OF THE INVENTION In view of the conventional problems as described above, the present invention provides a metal mold used for press cutting by a press, in which the lower cross section of the punch is formed in a rectangular shape. A front lower edge blade portion projecting downward is provided on the front edge side in the direction of relative movement of the plate material with respect to the punch, and a rear upper edge blade portion for cutting off scraps from the plate material is positioned higher than the front lower edge blade portion. The front lower edge blade portion and the rear upper edge blade portion are connected to each other by a concave curved intermediate blade portion in order to form the swirl residue.

Further, the back relief portion of the die corresponding to the punch is formed in an inverted cone shape so as to prevent catching of scraps.

[0010]

In the above structure, after the first punching process is performed by the punch, the second and subsequent processes are performed continuously little by little so that the plate material is not sheared by the rear upper edge of the punch. By processing the shavings, the shavings during processing are generated continuously without being divided, and the shavings are spirally wound in the concave curved intermediate blade part of the punch. The post-cutting process can be performed without causing

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

First, in order to facilitate understanding, an overall structure of a turret punch press will be described as an example of a punch press that can use the punching die according to the present invention.

With reference to FIG. 1, the gear-up portion 5 of the C-shaped frame 3 in the turret type punch press 1 is provided with a numerically controlled plate material movement positioning device 7. The plate material W is clamped by a clamp 9, and can be moved and positioned by a plate material moving / positioning device 7 in a direction (X axis direction) orthogonal to the paper surface in FIG. 1 and a horizontal direction (Y axis direction).

On the upper arm 11 of the C-shaped frame 3, as an example of an upper tool holder, an upper turret board 15 which is rotatable around a shaft 13 is suspended.
Various types of punch assemblies 17 are mounted on the upper surface of the base plate 5 on a plurality of concentric arcs.

In the punch assembly 17, the upper turret board 1
A pressing device 19 is provided on the upper arm 11 at a position closest to the plate material movement positioning device 7 of 5, and the striker 21 strongly presses the head of the punch P at the lower end thereof.

As an example of a lower tool holder, the lower arm 23 of the C-shaped frame 3 is provided with a lower turret board 27 rotatable around a shaft 25.
A plurality of dies D corresponding to the punch P are fitted to the punch P with their axes aligned with the punch P.

Upper turret board 15 and lower turret board 27
Is driven by, for example, a servo motor 31 provided in the column portion 29 of the C-shaped frame, and the chain 33, the intermediate shaft 35
Through the upper chain 37 and the lower chain 39, they are rotated by the same angle in the same direction.

A stroke changing device 41 for changing the stroke of the punch P is provided near the punch assembly 17.

More specifically, as shown in FIG. 2, a part of the upper arm 11 on the upper right side of the punch assembly 17 is provided with, for example, air cylinders 43 and 45 as a stroke changing device 41. . At the tip of the air cylinder 43, a piston rod 47 is horizontally attached to the left side, and can be expanded and contracted in the left and right directions. A spacer 51 as an inclusion is attached to the tip of the air cylinder 45 via a piston rod 49 so as to be vertically movable. As the piston rod 49 expands and contracts in the left-right direction, the spacer 51 moves in the left-right direction to move in and out between the striker 21 and the punch P.

The punch P is inserted into the punch guide 53 having a hollow cylindrical shape as the punch assembly 17 in alignment with the positioning guide key 55, and the guide key 55 is fixed to the punch guide 53 with a screw 57 or the like. . The punch guide 53 is provided on the outer peripheral portion of the punch guide 53 with a plate material W.
A lift spring 59, which is always biased upward to float from above, is provided.

The head 61 of the punch P is fixed to the upper part of the punch P by screws 63. A strip spring 65, which urges the punch P outward so as to pull out the punch P from the plate W, is provided on the outer periphery of the head portion 61.

The punch guide 53 is provided with a stripper plate 67 having a hole having the same sectional shape as the lower part of the punch P.
It is fixed to the screw 69 or the like.

The lower part of the punch P in FIG. 2 has a rectangular cross section. In the lower part of the punch P, a front lower edge blade portion 71 projecting downward is formed at the front side in the traveling direction of the plate material W, that is, at the right end in FIG. 2, and at the rear side in the traveling direction of the plate material W. On the left side in FIG. 2, a rear upper edge blade portion 73 positioned higher than the front lower edge blade portion 71 is horizontally formed. The front-side lower edge blade portion 71 and the rear-side upper edge blade portion 73 are arbitrary concave curved intermediate blade portions 75.
Connected by. The concave curved intermediate blade portion 75 has, for example, a curvature radius R ₁ and a curvature radius R ₂ , and is connected to the front upper edge blade portion 73 from the rear upper edge blade portion 73.

More specifically, the cross-sectional shape of the lower part of the punch P is rectangular, and one of the corners of the rectangular shape does not project largely downward, but one side of the rectangular shape is downward. It is formed on the front lower blade portion 71 protruding toward the rear side upper edge blade portion 73, and the opposite side opposite to the one side is formed on the rear upper edge blade portion 73. In other words, since the lower portion of the punch P is rectangular, the front lower edge blade portion 71 is formed on one side, and the opposite side is formed on the rear upper edge blade portion 73, the front lower edge blade portion 71 is formed. The two corners of the rectangular shape included in are substantially the same in height and are positioned below the other two corners included in the rear upper edge blade 73.

With the above-described structure, when the plate material W is additionally cut, for example, punched scraps become a continuous strip shape, and are wound in a spiral shape while drawing an arc with the concave curved intermediate blade portion 75. It gets caught and goes into the die D side.

As described above, the die D corresponding to the punch P is fitted to the lower turret board 27 with the axes thereof aligned as shown in FIG. The back relief portion 77 of the die D is formed, for example, in an inverted conical shape so as to prevent catching of punched dust. Thus, the punched dust that has been punched does not get caught in the back escape portion 77 of the die D. Therefore, the punched residue can be easily dropped below the die D.

Next, FIG. 3 shows a method of additional cutting of the plate material W.
More specifically, in the state shown in FIG. 3A before the post-cutting processing, the striker 21 is moved down by a pressing device (not shown) to press the head 61 of the punch P. FIG. 3B shows a state in which the head 61 of the punch P is pressed.
That is, the front lower edge blade portion 71 of the blade edge portion of the punch P is the die D.
Then, the plate material W is cut by the curved intermediate blade portion 75. In the state of FIG. 3B, the cylinder 43 as the stroke changing device 41 is operated to extend the piston rod 47 forward (to the left in FIG. 3B), and the outer peripheral portion of the head 61 of the punch P. Position it near.

When the striker 21 is raised in the state of FIG. 3B, the punch P tries to return to the state of FIG. 3A, but the piston rod 47 suppresses the rise of the punch P, and the punch P of FIG. As shown in (A) of FIG.
Abut the lower part of.

Further, by lowering the striker 21 again by the pressing device, as shown in FIG. 3B, the stroke of the punch P becomes smaller than a predetermined value, and the overcutting process is repeated. In this case, since the plate material W is not sheared by the rear upper edge blade portion 73 of the punch P,
A plastically deformed portion corresponding to a corner of the rear upper edge blade portion 73 does not occur, and "dag" corresponding to a triangular portion as in the conventional case does not occur.

Then, in the final step, for example, when cutting out Wa from the plate W, the piston rod 47 is returned to the original position by the operation of the cylinder 43 as the stroke changing device 41, and the cylinder 45 is operated. Then, the piston rod 49 is extended leftward in FIG. 4 (B) to interpose the spacer 51 on the head 61 of the punch P. As the striker 21 descends in this state, the rear upper edge blade portion 73 of the blade tip portion of the punch P is moved to the plate material W.
The punching residue Wa is cut off from the plate material W, and the additional cutting process is completed.

3A, 3B, 4A,
The states at the stroke lower positions of the front lower edge blade portion 71 and the rear upper edge blade portion 73 of the blade edge portion of the punch P with respect to the time for the additional cutting processing described in (B) are shown in FIGS.
Is shown in.

In FIGS. 5A and 5B, points A and B represent respective positions of the front lower edge blade portion 71 and the rear upper edge blade portion 73 before the additional cutting is performed, and solid curves are shown. The locus of additional cutting in the front lower edge blade portion 71 and the dotted curve show the locus of additional cutting in the rear upper edge blade portion 73. When the upper stroke 71a of the front lower edge blade portion 71 strokes within the thickness t of the plate W and the lower stroke 71b strokes below the thickness t of the plate W with a stroke length S, the punch P The stroke lower end of the rear upper edge blade portion 73 is lowered to a position 73C below the thickness t of the plate material W and the scrap Wa is cut off from the plate material W. .

The example of FIG. 5B is almost the same as the example of FIG. 5A, except that the stroke upper end 71a of the front lower blade 71 is different from that of FIG. The post-cutting process is performed in the state of being cut upward from the height t.
Others are the same as those in FIG.

By performing the above-mentioned additional cutting of the plate material, there is almost no triangular-shaped indentation portion called "dare pit" which has been conventionally generated, and the high-precision additional cutting is performed. Further, by using the above-described punch P, for example, strip-shaped scraps are wound in a spiral shape, which greatly facilitates the subsequent processing and cleans the overcutting.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[0036]

As can be understood from the above description of the embodiments, in short, the present invention provides a die used for the post-cutting work by a press, in which the lower section of the punch P is formed in a rectangular shape. , The front lower edge blade portion 71 protruding downward to the front edge side in the traveling direction of the plate material W relative to the punch P.
And a rear upper edge blade portion 73 for cutting off the scraps Wa from the plate material W is formed at a position higher than the front lower edge blade portion 71, and the front lower edge blade portion is formed in order to make the scrap dust spiral. 71 and the rear upper end blade portion 73 are connected by a concave curved intermediate blade portion 75.

Then, the back relief portion 77 of the die D corresponding to the punch P is formed in an inverted cone shape so as to prevent catching of scraps.

As is apparent from the above structure, in the present invention, the front lower edge blade portion 71 and the rear upper edge blade portion 73 formed so as to project from the lower portion of the punch P are in the shape of a concave curve for spiraling the scraps. Since they are connected by the intermediate blade portion 75, the additional cutting can be performed without forming a triangular portion as in the conventional case. Further, according to the above-described configuration, since the scraps generated by the overcutting process are not formed linearly long and are spirally wound in the portion of the intermediate blade portion 75, the tip of the scraps is formed by the die. It is possible to carry out the post-cutting processing over a long range without contacting the inner surfaces of the sheet material W and the relative feeding of the plate material W, and to discharge the scraps after the processing. It can be done easily.

[Brief description of drawings]

FIG. 1 is a side view of a turret punch press.

FIG. 2 is an enlarged view of a partial cross section of a portion viewed from the arrow II in FIG.

FIG. 3 is an operation diagram showing an example of a main operation of the present invention.

FIG. 4 is an operation diagram showing an example of a main operation of the present invention.

FIG. 5 is an explanatory diagram for explaining a main operation of the present invention.

FIG. 6 is an explanatory diagram of a problem.

[Explanation of symbols]

 71 ... Front lower edge blade 73 ... Rear upper edge blade 75 ... Intermediate blade P ... Punch D ... Die

Claims (2)

[Claims] 1. A die used for post-cutting processing by a press, wherein a lower cross section of a punch (P) is formed in a rectangular shape, and a relative traveling direction of a plate material (W) with respect to the punch (P). Front lower edge blade (7
1) is provided, a rear upper edge blade portion (73) for cutting off the waste (Wa) from the plate material (W) is formed at a position higher than the front lower edge blade portion (71), and the waste residue is swirled. For cutting, the front lower edge blade portion (71) and the rear upper edge blade portion (73) are connected by a concave curved intermediate blade portion (75). . 2. The back relief portion (77) of the die (D) corresponding to the punch (P) is formed in an inverted cone shape so as to prevent catching of scraps. The die for overcutting processing described in 1.