JPH05138259A - Piercing device - Google Patents

Abstract

PURPOSE:To prevent a crack from being generated even in a brittle material by working a stripe along the outer shape of a part to be pierced on a metal plate and providing a piercing punch to pierce the inside of this worked strip from this sheet plate. CONSTITUTION:A metal sheet 15 is set between a lower die 11 and an upper die 17, a stripper plate 24 presses and fixes the metal sheet 15 on the die element 14 of the lower die 11 through the lowering movement of the upper die 17 and a cutting edge part 22a of a stripe punch 22 presses the metal sheet 15. The stripe of the contour of the product is formed by this edge part 2a on the upper surface of the metal sheet. The metal sheet is fed one pitch toward the direction of an arrow A and the stripe part is positioned on the pierced hole 16. When the upper die 17 is lowered, the stripper plate 24 presses and fixes the metal sheet 15 on the die 14, when the piercing punch 21 cuts the metal sheet along the stripe in cooperation with a pierced hole 16. In this way, the material, even when it is brittle, can be pierced without generating a crack.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching device for punching a plate material.

[0002]

2. Description of the Related Art A punching device attached to a conventional press is shown in FIG. In the figure, an upper die 1 is provided with a punching punch 2, and a lower die 3 is provided with a die 5 having a punching hole 4. When the metal plate 6 is set on the die 5 and the upper die 1 is lowered, the punch 2 for punching and the punching hole 4 cooperate with each other to punch a product having a predetermined shape from the metal plate 6. It

[0003]

As described above, since the product is conventionally punched out from the metal plate 6 in one step, the product shown in FIG.
When the rotor core 7 of the electric motor shown in FIG. 0 has a complicated outer shape, cracks may occur especially in the concave corners as shown in FIG.

This is because, in the punch 2 for punching, the portion for punching out the concave corner portion of the product is a convex corner portion, so that stress tends to concentrate there, and such cracks tend to occur. Is likely to occur when the metal plate 6 is a brittle material.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a punching apparatus capable of punching without causing cracks even if a metal plate is a brittle material. .

[0006]

DISCLOSURE OF THE INVENTION The punching device of the present invention is provided with a streak processing part for processing a streak on the plate material with a contour having the same shape as the outer shape of the product to be punched, and the streak processed by this streak processing part. It is characterized in that a punching punch for punching the inside of the plate is provided. In this case, the streak processing section can be composed of laser processing means for performing streak processing by irradiating the plate material with laser light.

[0007]

[Function] Since the plate material is punched and then the product is punched out, there is no risk of cracking.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on.

In FIG. 1, which shows the overall construction of the punching device,
A die 14 is attached to a holder 12 of a lower die 11 attached to a bed of a press (not shown) via a die plate 13. The die 14 has a punching hole 16 having a contour shape matching the outer shape of the product punched from the metal plate 15.
Is provided.

On the other hand, a punch plate 20 is attached to a holder 18 of an upper die 17 which is attached to a ram of a press (not shown) via a backing plate 19. A punch 21 for punching is attached to the punch plate 20 at a position facing the punching hole 16 of the lower die 11. Further, the punch plate 20 is provided with a line punching punch 22 as a line forming portion which is located on the left side of the punching punch 20 in the drawing.
As shown in FIG. 2, the score punch 22 is provided with a blade portion 22a having a contour shape that conforms to the outer shape of the product punched from the metal plate 15. A stripper plate 24, which is biased downward by a compression spring 23, is provided on the upper mold 17 so as to be vertically movable.

In the punching device having the above structure, the metal plate 15
Is set between the lower mold 11 and the upper mold 17, the upper mold 17 is pushed down by a ram of a press (not shown). By this lowering operation of the upper die 17, first, the stripper plate 24 presses and fixes the metal plate 15 onto the die 14 of the lower die 11, and in this state, the blade portion 22a of the punch 22 for scoring is pressed against the metal plate 15. . Then, the blade portion 22a forms a line 25 having the same contour as the outer shape of the product on the upper surface of the metal plate 15, as shown in FIG.

After that, when the upper die 17 is moved upward by a ram (not shown), the metal plate 15 is fed by the conveying device (not shown) one pitch to the right as shown by the arrow A in FIG. The forming portion comes to be located on the punching hole 16.

When the upper die 17 is moved downward in this state, the stripper plate 24 presses and fixes the metal plate 15 onto the die 14 in the same manner as described above, and then the punch 21 for punching is punched. The metal plate 15 is cut along the score lines 25 as shown in FIG. As a result, the product 26 is stamped and formed from the metal plate 15. As described above, according to this embodiment, when the punch 26 for punching is used to punch the product 26 from the metal plate 15, since the lines 25 are formed along the contour of the punching shape, the punching is performed. At times, the shocking shearing force acting on the punched portion of the metal plate 15 becomes relatively small. Therefore, the product has a concave corner portion as shown in FIG.
Even if 5 is a brittle material, there is no danger of cracks in the concave corners of the product. Next, FIGS. 5 to 7 show a second embodiment of the present invention. In the following, the same parts as those in FIG.

That is, this embodiment is different from the above-mentioned one in that the metal plate 15 is formed with streaks by laser light. In FIG. 5, the holder 12 of the lower mold 11 has a space. 27 is formed, and a laser processing head 28 which is a laser processing means is provided in the void 27. The laser processing head 28 is moved at a high speed in both the X-axis and the Y-axis directions on one horizontal plane by a moving device (not shown). The moving device is controlled by a control device (not shown) to move along a trajectory along the outer shape of the product to be finally punched.

On the other hand, holes 29 and 30 communicating with the cavity 27 are formed in the die plate 13 and the die 14, and the hole 30 of the die 14 has a hole 31a having the same contour as the outer shape of the product to be punched. The template 31 is attached.

In the punching device having the above structure, the metal plate 15
When is set between the lower mold 11 and the upper mold 17, first, the laser processing head 28 irradiates the back surface of the metal plate material 15 with laser light and moves at high speed at a locus along the outer shape of the product by a moving device not shown. Be moved. The back surface of the metal plate material 15 is relatively shallowly melted at a portion irradiated with laser light, and the melted portion is blown off by an assist gas or the like. As a result, as shown in FIG. A crease 32 having a contour along is inserted. Since the metal plate 15 is not cut by laser light, there is no support even if the laser processing head 28 is moved at high speed.

When the streaks 32 are formed on the back surface of the metal plate material 15, the metal plate material 15 is moved in the direction of one pitch arrow A,
The portion where the creases 32 are formed is located on the punching hole 16. When the upper mold 17 descends in this state, the stripper plate 2
4 presses and fixes the metal plate 15 onto the die 14, and then the punch 21 for punching cooperates with the punching hole 16 to cut the metal plate 15 along the score lines 32 as shown in FIG. . As a result, the product 33 is punched from the metal plate 15. Even with this structure, the same effect as that of the first embodiment can be obtained.

When forming the rotor core laminated plate by punching out the slot holes 35 from the annular metal plate 34 as shown in FIG. 8, the metal plate 3 is placed at the position B in FIG.
Laser light is irradiated to the back surface of 4 along the contour of the hole 35 to form the lines 36, and then the metal plate 34 is rotated by one pitch and punched at a position C in FIG. 8 by a punch (not shown). The hole 35 may be formed by punching. The plate material to be punched is not limited to a metal plate, and may be a plastic plate material.

[0019]

As described above, according to the punching device of the present invention, after the plate material is processed to have the creases, the product can be punched from the plate material. Therefore, even if the plate material to be punched is a brittle material, It is possible to obtain an excellent effect that there is no possibility of cracking.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main portion of a punch for forming a line.

FIG. 3 is an enlarged vertical cross-sectional view showing a state of streaking.

FIG. 4 is an enlarged vertical sectional view showing a state of punching.

FIG. 5 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG.

FIG. 7 is a view corresponding to FIG.

FIG. 8 is a plan view for explaining another processing example of the present invention.

FIG. 9 is a view corresponding to FIG. 1 showing a conventional punching device.

FIG. 10: Plan view of punched product

FIG. 11 is an enlarged view of the same portion.

[Explanation of symbols]

Reference numeral 11 is a lower die, 14 is a die, 15 is a metal plate, 16 is a punching hole, 17 is an upper die, 21 is a punch for punching, 22 is a punch for streaking (stitching portion), 25 is a streak, 28 Is a laser processing head (streak processing means), and 32 and 36 are streaks.

Claims (2)

[Claims] 1. A punching process for a plate material, wherein a streak processing part for processing a streak on the plate material along the same contour as the outer shape of the punched part, and an inner side of the streak processed by the streak processing part A punching device for punching from a plate material. 2. The punching device according to claim 1, wherein the streak processing section comprises laser processing means for irradiating a plate material with laser light to form streak lines.