JP2016203209A - Protrusion forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a protrusion of a truncated cone shape.SOLUTION: A protrusion forming method of forming a protrusion of a truncated cone shape on a surface of a plate-like workpiece includes: a process of processing a small hole 3 corresponding to a circle part 5 at a top part of a truncated cone part 1 on a workpiece; a process of processing a plurality of radial slits 13 by laser processing between a bottom surface circle part 7 corresponding to a circle part on a bottom surface of the truncated cone part 1 and the small hole 3, and processing a plurality of cone surface forming pieces 9 of a trapezoidal shape on a part as a cone surface of the truncated cone part 1; and a process of forming the protrusion of the truncated cone shape on the surface of the workpiece by bending the plurality of cone surface forming pieces 9 so as to protrude to the surface of the workpiece.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a protruding portion forming method for forming a truncated cone-shaped protruding portion on the surface of a plate-like workpiece, and more specifically, forming a plurality of conical surfaces obtained by dividing the conical surface of the truncated cone in the circumferential direction. The present invention relates to a method of forming a frustoconical protrusion formed by a piece.

  Conventionally, when a frustoconical protrusion having a through hole at the top is formed on the surface (upper surface or lower surface) of a plate-shaped workpiece, after machining a small hole in the workpiece, the periphery of the small hole is conical. A truncated cone-shaped projecting portion is formed by projecting to (see, for example, Patent Document 1).

JP 2006-7276 A

  In the configuration described in Patent Document 1, a frustoconical protrusion is formed on the lower surface of a plate-like workpiece placed on the upper surface of a die. In the method described in Patent Document 1, a workpiece placed on a die is pressed against a cone-shaped cone receiving surface formed on the die by a lower portion of the cone punch, and a cone shape formed on the lower portion of the cone punch. When the workpiece is clamped by the overhang forming portion and the cone receiving surface, the workpiece is processed with the initial through hole by the cooperation of the pierce punch provided in the die and the pierce punch insertion hole of the cone punch. is there.

  That is, when forming the frustoconical projecting portion, the conical portion is continuously projected over the entire circumference, and the through hole is punched simultaneously. That is, there is a problem that the load on the mold (die, conical punch) is large because the forming process of the frustoconical protrusion and the punching process of the through hole are simultaneously performed.

The present invention was made in view of the problems as described above, and is a protruding portion forming method for forming a truncated cone-shaped protruding portion on the surface of a plate-shaped workpiece,
(A) a step of machining a small hole corresponding to the circular portion at the top of the truncated cone portion into the workpiece;
(B) A plurality of radial slits are machined by laser machining between a bottom circular portion corresponding to a circular portion of the bottom surface of the truncated cone portion and the small hole to form a conical surface in the truncated cone portion. Processing the part into a plurality of trapezoidal conical surface forming pieces,
(C) a step of bending the plurality of conical surface forming pieces into a shape protruding to the surface of the work, and forming a truncated cone-shaped protrusion on the surface of the work;
Each process is provided.

  Further, in the projecting portion forming method, the bending process of the conical surface forming piece is performed by bending all the conical surface forming pieces simultaneously or for each of a plurality of groups. .

  Further, in the projection forming method, after laser processing of small holes and slits is performed using a laser / punch combined processing machine, the conical surface forming piece is bent to the laser / punch combined processing machine. It is characterized by being performed by the provided punch die and die die.

  According to the present invention, the plurality of conical surface forming pieces forming the conical surface of the truncated cone are divided into the circumferential direction by laser processing a plurality of radial slits in the plate-like workpiece, and the conical surface is formed. The piece is formed into a truncated cone shape by projecting. Therefore, it is possible to reduce the load on the mold for molding the frustoconical protrusion, and to improve the life of the mold.

It is explanatory drawing of the method of shape | molding the truncated cone part which concerns on embodiment of this invention. It is a perspective explanatory view showing a truncated cone part according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, in order to form a truncated cone-shaped protrusion (conical frustum portion) 1 on the surface of a plate-like workpiece W (appropriate one of the upper surface or the lower surface), the following process is performed. That is, as shown in FIG. 1A, the small hole 3 is laser processed in the workpiece W. The small holes 3 can be punched by a die (punch die, die die: not shown) in a punch press, for example. The small hole 3 is a hole corresponding to the top circular portion 5 in the truncated cone portion (projecting portion) 1.

  As described above, in order to form the truncated cone part 1 after processing the small hole 3 in the workpiece W, first, the small circular part 7 corresponding to the circular part of the bottom surface of the truncated cone part 1 is used to form the small circular part 1. A plurality of trapezoidal conical surface forming pieces 9 reaching the holes 3 are formed. At this time, as shown in FIG. 1B, the plurality of conical surface forming pieces 9 form radial slits 13 at equal intervals in the circumferential direction by laser processing.

  As described above, after processing the small holes 3 and the plurality of radial slits 13, as shown in FIG. 2 (B), a die having a truncated cone forming concave portion 15 which is a substantially hemispherical concave surface on the end surface. The mold 17 presses the surface side of the peripheral edge of the bottom circular portion 7 of the workpiece W. Then, the truncated conical surface forming piece 9 is divided into a plurality of conical surface forming concave portions by a punch die 21 having a substantially hemispherical pressing projection 19 on the end surface corresponding to the truncated conical forming concave portion 15. By pressing into 15 and bending, the truncated cone part 1 as shown in FIG. 2A is formed on the surface of the workpiece W.

  As described above, when the truncated cone part 1 is formed, the tip side (radially inner side) of the slit 13 between the conical surface forming pieces 9 is expanded. Therefore, compared with the case where the conical surface of the truncated cone part 1 is formed in a continuous state in the circumferential direction, the load on the die mold 17 and the punch mold 21 is reduced, and the die mold 17 and the punch mold are reduced. 21 can improve the service life.

  As already understood, after the small holes 3 and the slits 13 are laser-processed in the workpiece W, and then the truncated cone part 1 is processed using the die mold 17 and the punch mold 21, As a machine, it is desirable to use a laser / punch combined processing machine in which a laser processing machine and a press processing machine are combined. Since the laser / punch combined processing machine has a well-known configuration, a detailed description of the laser / punch combined processing machine will be omitted.

  In order to perform the forming process of the truncated cone portion 1 using the laser / punch combined processing machine, first, after performing laser processing of the small holes 3 and the slits 13, a punch die provided in the laser / punch combined processing machine. The frustum portion 1 is formed by the die 21 and the die die 17. Therefore, the laser processing and the molding process can be performed continuously, and the molding process of the truncated cone part 1 can be performed efficiently.

  By the way, in the said description, the said slit 13 demonstrated that it laser-processed in the state penetrated from the surface of the workpiece | work W to the back surface. However, the slit 13 can be processed into a groove shape on the surface of the workpiece W by adjusting the output of the laser. That is, the slit 13 may be formed in a groove shape having an appropriate depth even if it penetrates from the front surface to the back surface of the workpiece W.

1 Frustum (frustum-shaped projection)
3 Small hole 5 Circular part 7 Circular part (bottom circle part)
9 Conical surface forming piece

Claims (3)

A protruding portion forming method for forming a truncated cone-shaped protruding portion on the surface of a plate-shaped workpiece,
(A) a step of machining a small hole corresponding to the circular portion at the top of the truncated cone portion into the workpiece;
(B) A plurality of radial slits are machined by laser machining between a bottom circular portion corresponding to a circular portion of the bottom surface of the truncated cone portion and the small hole to form a conical surface in the truncated cone portion. Processing the part into a plurality of trapezoidal conical surface forming pieces,
(C) a step of bending the plurality of conical surface forming pieces into a shape protruding to the surface of the work, and forming a truncated cone-shaped protrusion on the surface of the work;
The protrusion part forming method characterized by including each process of these.   2. The protruding portion forming method according to claim 1, wherein the bending of the conical surface forming piece is performed by bending all the conical surface forming pieces simultaneously or for each of a plurality of groups. Projection molding method. 3. The protruding portion forming method according to claim 1 or 2, wherein after performing laser processing of small holes and slits using a laser / punch combined processing machine, the conical surface forming piece is bent. A projecting method for forming a protrusion, which is performed by a punch die and a die die provided in a punch compound processing machine.

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