JP6170413B2 - Method of punching plate workpiece and punch die - Google Patents

Description

  The present invention relates to a punching method, a punch mold, and a punching process for a sandwich plate in which thin metal plates such as aluminum and steel plate are integrally provided on both surfaces of a resin plate such as foamed polyolefin resin and solid polyolefin resin. Related to goods. More specifically, the present invention relates to a punching method, a punch die, and a punched product that can prevent the phenomenon of turning up of a metal plate on the punched upper surface during punching of a plate-like workpiece as described above.

  For example, as a general-purpose building material, for example, a sandwich plate having a thin metal plate such as aluminum integrally provided on both surfaces of a foamed polyolefin resin-based resin plate has been developed. When this type of plate-shaped workpiece is punched using a punch die and a die die having a general configuration, the punching can be performed. However, when the punching hole of the plate-like workpiece is observed, a turned-up portion is generated at a part of the peripheral portion of the punching hole in the metal plate on the upper surface side of the plate-like workpiece, and the shape of the punching hole may be deteriorated.

  That is, as shown in FIG. 1, a plate-like workpiece 1 having a structure in which thin metal plates 1B and 1C are integrally provided on both upper and lower surfaces of a resin plate 1A is placed on a general die mold 3, When punching the plate-like workpiece 1 with a typical punch die 5, the plate-like workpiece 1 is pressed against the upper surface of the die die 3 by the work pressing surface 9 on the lower surface of the punch guide 7 in the punch die 5. Fix it. After that, the punch blade portion 13 provided at the lower portion of the punch body 11 provided in the punch guide 7 so as to be movable up and down protrudes downward from the punch guide hole 17 of the work holding portion 15 provided at the lower portion of the punch guide 7. Thus, the plate workpiece 1 is punched.

  As described above, when punching of the plate-like workpiece 1 by the punch blade portion 13, the upper metal plate 1B is curved and deformed toward the resin plate 1A side at the upper inner peripheral edge of the punching hole 19 in the plate-like workpiece 1. A sag (curved deformation portion) 21 is generated. And when pulling out the punch blade part 13 from the punching hole 19, due to the contact between the outer peripheral surface of the punch blade part 13 and the sag 21, a part of the sag 21 is dragged upward, causing a turn-up. There is. That is, the shape of the punched hole 19 is deteriorated by this turning up.

  By the way, there is Patent Document 1 as a prior example that seems to be related to the present invention.

JP-A-8-294737

  In the punch die described in Patent Document 1, when drilling an internal screw after drilling a plate-shaped workpiece, burrs generated during drilling and internal burrs are generated from the hole edge. In order not to protrude from the surface, an upper surface recess is formed at the upper end of the perforation. That is, the punch die described in Patent Document 1 has a configuration in which a convex part for concave part of the workpiece is provided at the peripheral edge of the bottom center hole in the punch guide.

  However, the above punch die is used for forming an upper surface recessed portion on the work surface so that burrs generated during the machining of the inner screw do not appear on the work surface when drilling a hole forming the inner screw into the work. Is. That is, a workpiece that can be machined with an internal screw after drilling is targeted.

  However, as described above, the present invention is intended to process a plate-shaped workpiece having a sandwich structure in which metal plates thinner than the resin plate are integrally provided on both sides of the resin plate. As described above, when punching a plate-like workpiece (sandwich plate) having the above-described configuration, there is a problem that a turning phenomenon occurs in the punching hole of the upper thin metal plate.

  Therefore, when punching the sandwich plate, the sagging generated on the thin metal plate on the upper surface of the sandwich plate is provided on the work pressing surface of the punch die until the punch blade portion of the punch die is removed from the workpiece. It has been found that the above-described punching phenomenon can be prevented by pressing and holding the protrusion. The present invention is based on this finding.

The present invention has been made in view of the above-described problems. A plate-like workpiece integrally provided with metal plates on both sides of a resin plate is punched by cooperation of a punch die and a die die. A punching method for a plate-like workpiece, wherein a peripheral portion of a punched portion of one metal plate is bent and deformed to the resin plate side by a protrusion provided on a peripheral portion of a punch guide hole on a work pressing surface of the punch die. After that, the plate-like workpiece is punched, and the curved portion is pressed and held by the protrusion until the punch blade portion of the punch die is pulled out from the plate-like workpiece. .

In the punching method for the plate-like workpiece, the rising height of the curved and deformed portion is larger than the plate thickness of the one metal plate.

Further, a punch die for punching a plate-like workpiece integrally provided with metal plates on both sides of a resin plate, the peripheral portion of the punch guide formed on the work pressing surface on which the punch die presses the workpiece to include a protruding portion that curves deform the periphery of the punching portion of one metal plate to the resin sheet side, said protrusions, until the punch comes out of the plate-shaped workpiece in the punch, a portion of said curved deformation It is the structure which press-holds, It is characterized by the above-mentioned.

  Further, in the punch die, the projecting dimension of the protrusion from the work pressing surface is larger than the thickness of the one metal plate.

  According to the present invention, when punching a plate-shaped workpiece (sandwich plate) having a structure in which a thin metal plate is integrally provided on both sides of a resin plate, the sagging formed on the thin metal plate is held as it is. In other words, the punching process can be performed in a state in which the sag is not turned up.

It is explanatory drawing of the punching process of the sandwich plate by the conventional punch metal mold | die and die metal mold | die. It is explanatory drawing which shows the structure of the characteristic part of the punch metal mold | die which concerns on embodiment of this invention. It is explanatory drawing of the punching process of the sandwich plate by the punch metal mold | die which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to components having the same functions as those of the above-described conventional configuration, and redundant description will be omitted.

  Referring to FIG. 2, the punch die 5A according to the embodiment of the present invention includes a punch guide 7 similar to the punch die 5 described above, and the punch body 11 moves up and down in the punch guide 7. It is provided freely. The punch blade portion 13 provided at the lower portion of the punch body 11 is provided with a punch guide hole 17 in the work pressing portion 15 provided at the lower portion of the punch guide 7 so as to be able to penetrate vertically.

  An annular protrusion 23 protruding downward is provided on the peripheral edge portion of the punch guide hole 17 on the work holding surface 9 which is the lower surface of the work holding portion 15. The projection 23 functions to press and hold the above-described sag (curved deformation portion) 21, and the projection dimension T of the projection 23 from the workpiece pressing surface 9 is a metal in the plate-like workpiece 1. The dimension is larger than the thickness t of the plates 1B and 1C.

  In the configuration as described above, as shown in FIG. 3, after the plate-like workpiece 1 is placed and positioned on the die mold 3, the punch head (not shown) in the punch mold 5A can be moved up and down freely (not shown). ), The punch guide 7 is lowered via a stripper spring (not shown) provided in the punch die 5A, and the work pressing surface 9 of the punch guide 7 is moved down like the general punch die. It is pressed against the upper surface of the plate-like workpiece 1. As described above, when the workpiece pressing surface 9 presses the upper surface of the plate-like workpiece 1 and the plate-like workpiece 1 is sandwiched between the die mold 3, the protrusion 23 provided on the workpiece pressing surface 9 becomes the metal on the upper surface. It will bite into the board 1B (see FIG. 3A).

  As described above, when the protrusion 23 provided on the work pressing surface 9 in the punch die 5A bites into the metal plate 1B on the upper surface, the metal plate 1B on the upper surface sags at the portion pressed downward by the protrusion 23 ( (Curved deformation portion) 21 occurs. That is, the peripheral edge of the part to be punched out of the metal plate 1B is pressed by the outer peripheral surface of the protrusion 23 and is bent and deformed toward the resin plate 1A side, that is, the lower side of the plate-like workpiece 1, thereby Will occur. Thereafter, when the striker is further lowered, the punch body 11 is lowered, and the plate workpiece 1 is punched by the punch blade portion 13 provided in the punch body 11 (see FIG. 3B).

  At this time, the projecting dimension T of the protrusion 23 from the work pressing surface 9 is larger than the plate thickness t of the metal plates 1B and 1C in the plate-like workpiece 1. The relationship between the protruding dimension T and the plate thickness t is approximately T≈4t. Accordingly, when the sag 21 is pressed by the outer peripheral surface of the protrusion 23, the contact of the outer peripheral edge of the sag 21 with the outer peripheral surface of the punch blade portion 13 tends to be suppressed. In other words, the protrusion 23 is located between the sag 21 and the punch blade 13 generated when the plate-like workpiece 1 is punched, and tends to separate the sag 21 from the outer peripheral surface of the punch blade 13. There is something.

  The protrusion 23 provided on the punch die 5A presses and holds the sag 21 until the punch blade 13 comes out of the plate-like workpiece 1 (FIG. 3C). Reference), the sagging 21 does not turn up. That is, a punching hole (punching) is not formed on the inner peripheral edge of the punching hole (punching hole) 19 of the plate-like workpiece 1 without causing a turning-up portion due to the rise of the punch blade 13 in the punch die 5A. Hole) 19 can be punched while maintaining a good state.

  As can be understood from the above description, the plate-like workpiece (sandwich plate) 1 integrally provided with the metal plates 1B and 1C thinner than the resin plate 1A is formed on both the upper and lower surfaces of the resin plate 1A. At this time, the sag 21 in the upper metal plate 1B of the plate-like workpiece 1 is pressed and held by the projection 23 provided on the workpiece pressing surface 9 in the punch die 5A until the punch blade portion 13 comes out of the plate-like workpiece 1. It is what you are doing. Therefore, when the punch blade 13 is lifted out of the plate-like workpiece 1, it is possible to prevent the roll-up that tends to occur in the sagging 21 due to the contact between the outer peripheral surface of the punch blade 13 and the sagging 21. It is. Therefore, the punched product is a processed product having a good punching hole shape.

  In the above description, it has been described that the relationship between the protrusion dimension T of the protrusion 23 and the plate thickness t of the metal plates 1B and 1C is T≈4t. However, the relationship between the protrusion dimension T of the protrusion 23 and the plate thickness t of the metal plates 1B and 1C only needs to be T> t.

DESCRIPTION OF SYMBOLS 1 Plate-like workpiece 1A Resin plate 1B, 1C Metal plate 3 Die die 5, 5A Punch die 7 Punch guide 9 Work holding surface 11 Punch body 13 Punch blade part 15 Work holding part 17 Punch guide hole 19 Punch hole 21 Sag ( Curved deformation part)
23 Protrusion

Claims (4)

A plate-like workpiece punching method for punching a plate-like workpiece integrally provided with metal plates on both sides of a resin plate by cooperation of a punch die and a die die, in the punch die After the peripheral edge of the punched portion of one metal plate is bent and deformed to the resin plate side by the protrusion provided on the peripheral edge of the punch guide hole of the work pressing surface, the plate-shaped workpiece is punched, A punching method for a plate-like workpiece, wherein the curved portion is pressed and held by the projection until the punch blade portion in the punch die is pulled out. 2. The punching method for a plate-like workpiece according to claim 1, wherein a rising height of the curved deformed portion is larger than a thickness of the one metal plate. 3. Method. A punch die for punching a plate-like workpiece integrally provided with metal plates on both sides of a resin plate, and the punch die is formed on the work holding surface that presses the workpiece, on the peripheral portion of the punch guide, One metal plate is provided with a projecting portion that bends and deforms the periphery of the punched portion toward the resin plate, and the projecting portion presses and holds the curved and deformed portion until the punch in the punch die comes out of the plate-shaped workpiece. A punch mold characterized in that it is configured to perform.   4. The punch die according to claim 3, wherein a protruding dimension of the projection from the work pressing surface is larger than a thickness of the one metal plate.

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