JPH0470095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of punching out a composite plate in which a metal plate is coated with an adhesive covered with a release paper into various shapes, and a punching die for the same. is used in the manufacture of reinforcing plates attached to the back side of automobile bodies.

[Prior Art] Conventionally, as shown in FIG. 4, for example, a reinforcing plate to be attached to the back side of an automobile body is produced by placing a composite plate 1 on a female mold 3 having punched holes 2, and
It is manufactured by punching this with a male die 4 having a flat bottom surface. The composite plate 1 is made by attaching an adhesive 7 covered with a release paper 6 to one side of a metal plate 5 such as a steel plate, and as shown in FIG.
There are cases in which the metal plate 5 is punched out with the side facing up, and cases in which the metal plate 5 is punched out with the metal plate 5 side facing up as shown in FIG.

However, when punching with the release paper 6 side up, as shown in FIG. The peripheral edge is raised toward the adhesive 7 side. Therefore,
When peeling off the release paper 6 and pasting it together with the adhesive 7, there is a problem in that the bulge at the peripheral edge gets in the way and makes it difficult to stick the whole thing together sufficiently. In addition, when punching the metal plate 5 with the side facing upward, as shown in FIG.
0 tends to stand out. Therefore, when handling the punched product, there is a problem in that the burr 10 is likely to cause injury. Furthermore, whether the release paper 6 is placed on top or the metal plate 5 is placed on top, the release paper 6 tends to tear, and if the release paper 6 is provided after punching to prevent this, the number of man-hours will increase and the procedure will be complicated. There is also the problem of getting used to it.

[Problems to be Solved by the Invention] The present invention provides a method for punching a composite plate without causing bending of the peripheral edge, protrusion of burrs onto the surface, or tearing of the release paper, which prevents adhesive from adhering. The objective is to improve the quality of punched products.

[Means for Solving the Problems] The measures taken in the present invention to solve the above problems are as follows: When punching out a composite plate having an adhesive covered with a release paper on one side of a metal plate using a punching die. , Place the composite board on the female mold with the release paper side facing up, press the composite board lightly without applying too much pressure at the center of the bottom of the male mold, press strongly only the peripheral edge of the male mold against the composite board, and punch out. A method for punching out a composite board, and a punching die for punching out a similar composite board, with the lower periphery of the male die
Leaving a 0.3 to 1 mm wide cutting edge, scoop out the center of the lower surface of the male die to a depth approximately equal to the combined thickness of the composite board's adhesive and release paper to create a relief part, and cut the inner surface of this relief part. 20 to 40° to the outer surface of the male mold.
The punching die is a composite board that is inclined inward at an angle of .

[Function] According to the method of the present invention, the composite plate is not strongly pressed at the center of the lower surface of the male mold, so when punching the composite plate, no extra bending force is applied to the periphery of the part that will become the punched product. Therefore, the peripheral edge of the punched product does not swell toward the adhesive side and the overall adhesion of the adhesive is not hindered. Moreover, since the center part of the lower surface of the male mold lightly presses the composite board, when the peripheral part of the male mold presses the composite board, the adhesive will not escape inward and shift the release paper. Since the release paper does not shift and only the peripheral edge of the male mold is strongly pressed against the composite plate, it is difficult for excessive force to be applied to the release paper, making it difficult for the release paper to tear. It is. Furthermore,
Even if burrs occur on the peripheral edge of the metal plate of the punched product, the burrs protrude toward the adhesive and are covered with the adhesive, so there is no risk of injury from the burrs.

On the other hand, according to the punching die of the present invention, there is a relief part at the center of the lower surface of the male die with a depth approximately equal to the combined thickness of the adhesive and release paper, so the composite plate can be pressed lightly with this part without applying too much pressure. be able to.
Then, only the narrow cutting edge portion left on the periphery of the lower surface of the male die can be strongly pressed against the composite plate to reliably punch out the composite plate. 0.3 to 1 of this cutting edge
mm width and 20 to 40° inclination of the inner surface of the relief part, the area where the cutting edge is pressed and the adhesive escapes is minimized to prevent a decrease in adhesive strength, and at the same time, the necessary strength of the cutting edge is required. This is to ensure that

[Example] As shown in FIG. 1, in the present invention,
A composite plate 1 is placed on a female die 3 having a punching hole 2, and this is punched out with a male die 4. The composite plate 1 has an adhesive 7 covered with a release paper 6 on one side of a metal plate 5, and is placed on the female mold 3 with the release paper 6 side facing up.

The lower surface of the male mold 4 is hollowed out leaving a cutting edge portion 8 at the periphery, and a relief portion 9 is formed at the center. Therefore, when the male mold 4 is lowered, the central part of the lower surface of the male mold 4 does not apply strong pressure to the composite plate 1 due to the relief part 9, but comes into contact with the composite plate 1 to the extent that it lightly presses it. On the other hand, as the male mold 4 descends, the cutting edge 8 on the lower surface of the male mold 4 is exposed to the composite plate 1.
It will be pressed hard and punched out.

As shown in FIG. 2, the depth h of the relief part 9
needs to be approximately equal in size to the combined thickness of the release paper 6 and adhesive 7 of the composite board 1.
This is to allow the composite plate 1 to be lightly pressed without applying strong pressure. If the depth h of the relief portion 9 is too shallow, the composite plate 1 will be pushed too much and the peripheral edge of the punched product will be likely to bend and bulge. Moreover, if the depth of the relief part 9 is too deep, the adhesive 7 at the part pressed by the cutting edge part 8 escapes inward, displacing the release paper 6, and making the release paper 6 easy to tear.

As also shown in FIG. 2, the width t of the cutting edge portion 8 of the male mold 4 is 0.3 to 1 mm, and the inner surface of the relief portion 9 is inclined inward with respect to the outer surface of the male mold 4. It is necessary that the inclination angle θ is 20 to 40°. If the width t of the cutting edge portion 8 is too wide, the width at which the adhesive 7 escapes due to its pressure contact becomes too wide, and the adhesion of the punched product, particularly at the peripheral edge portion, decreases. On the other hand, if it is too narrow, sufficient strength of the cutting edge portion 8 cannot be obtained. Also, the inclination angle θ of the inner surface of the relief portion 9
If it is too large, the adhesive 7 will be forced inward by this inclined surface, causing the release paper 6 to tear. On the other hand, if the inclination angle θ is too small, sufficient strength of the cutting edge portion 8 cannot be maintained.

As shown in FIG. 3, according to the present invention, the central part of the lower surface of the male mold 4 lightly presses the composite plate 1 through the relief part 9, thereby preventing deformation such as displacement of the release paper 6. While holding down to maintain a flat surface, press the male mold 4.
The cutting edge portion 8 at the peripheral edge of the lower surface of the blade is strongly pressed against the composite pressure, and the blade is punched out. In addition, because the width of the cutting edge part 8 is narrow, the range in which the adhesive 7 escapes due to the pressure contact of the cutting edge part 8 is also narrow, and the adhesive 7 elastically returns to a certain extent. There is no decrease in adhesive strength at the peripheral edge.

In addition, for a composite board made of a 0.2 mm thick steel plate with adhesive and release paper attached to a 1.0 mm thickness, the depth h of the relief part 9 in Fig. 2 is 1.0 mm, and the inclination angle θ of the inner surface of the relief part 9 is
As a result of punching using the male die 4 having an angle of 30° and a width t of the cutting edge portion 8 of 0.5 mm, an extremely excellent punched product was obtained, and the male die 4 also exhibited sufficient strength and life.

[Effects] As explained above, according to the present invention, a composite plate can be punched out without bending the peripheral edge of the punched product, without causing burrs to protrude onto the surface, and without causing tearing of the release paper. Therefore, punched products can be efficiently manufactured without the risk of injury due to poor adhesion or burrs, and the quality of the punched products can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged view of the vicinity of the relief part of the male type, Fig. 3 is an explanatory view of the punched state, and Fig. 4 a and b are each conventional Figures 5a and 5b are explanatory diagrams of a punched product obtained by the conventional punching method and punching die, respectively. DESCRIPTION OF SYMBOLS 1...Composite board, 2...Punching hole, 3...Female mold, 4...Male mold, 5...Metal plate, 6...Release paper, 7...Adhesive, 8...Blade tip, 9... ...Escape club.

Claims (1)

[Scope of Claims] 1. When punching out a composite plate having an adhesive covered with a release paper on one side of a metal plate using a punching die, the composite plate is placed on a female die with the release paper side facing up, and a male die is used. A method for punching out a composite plate, which is characterized in that the center part of the lower surface of the composite plate is lightly pressed without applying strong pressure, and only the peripheral edge of the male die is strongly pressed against the composite plate to punch out the composite plate. 2 A punching die for punching out a composite plate having an adhesive covered with release paper on one side of a metal plate, with a cutting edge of 0.3 to 1 mm width left on the periphery of the lower surface of the male die, and a cutting edge at the center of the lower surface of the male die. Hollow out to a depth approximately equal to the combined thickness of the composite board's adhesive and release paper to form a relief part, and then insert the inner surface of this relief part inward at an angle of 20 to 40 degrees to the outer surface of the male mold. A composite plate punching die characterized by an inclined shape.