Protrusion molding device, protrusion molding method, and molded article

Patent metadata

Field	Value
Publication number	US-2018200773-A1
Application number	US-201615742742-A
Country	US
Kind code	A1
Filing date	Jun 29, 2016
Priority date	Jul 7, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

Provided are a protrusion forming device, a protrusion forming method, and a formed article, with which a height equal to or greater than the plate thickness is possible, the edges are sharp, and cracking can be prevented. This protrusion forming device is characterized by being equipped with a die unit provided with a die hole, and a punch unit having a large punch part with a size such that this part cannot be inserted into the die hole, and a small punch part that protrudes from the large punch part toward the die unit and can be inserted into the die hole, and characterized in that the workpiece is deformed by pressing a portion of the workpiece arranged between the die unit and the punch unit toward the die unit by means of the punch unit, thereby forming a protrusion.

First claim

1 . A protrusion forming device comprising:
a die unit provided with a die hole; and a punch unit having a large punch part that can advance and retreat in a first direction towards the die unit, and is of a size incapable of insertion into the die hole, and a small punch part that projects from the large punch part to a side of the die unit, and is of a size capable of insertion into the die hole, wherein the protrusion forming device causes a workpiece to deform by pressing a part of the workpiece arranged between the die unit and the punch unit to a side of the die unit by way of the punch unit.

2 . The protrusion forming device according to claim 1 , wherein
an interval d 1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d 2 between a lateral face of the small punch part and an inner face of the die hole are in a relationship of d 2 <d 1 .

3 . The protrusion forming device according to claim 1 , wherein
an interval d 2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece are in a relationship of d 2 <T.

4 . The protrusion forming device according to claim 1 , wherein
a sloped face which inclines in a direction in which the thickness of the small punch part becomes thinner as approaching a rim part of the small punch part is provided to a bottom face of the small punch part.

5 . A protrusion forming method comprising:
a placement step of placing a workpiece on a die unit provided with a die hole; and a punching step of forming a protrusion by causing a punch unit, which has a large punch part of a size incapable of insertion into the die hole, and a small punch part that projects from the large punch part to a side of the die unit and is of a size capable of insertion into the die hole, to move in a first direction approaching the side of the die unit, and pressing a part of a workpiece arranged between the die unit and the punch unit to the side of the die unit by way of the punch unit so as to deform the workpiece.

6 . The protrusion forming method according to claim 5 ,
wherein an interval d 1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d 2 between a lateral face of the small punch part and an inner face of the die hole are in a relationship of d 2 <d 1 .

7 . The protrusion forming method according to claim 5 ,
wherein an interval d 2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece are in a relationship of d 2 <T.

8 . The protrusion forming method according to claim 5 , wherein the punching step includes:
a first step of forming a protrusion by way of a punch unit provided in which a sloped face that inclines in a direction in which a thickness of the small punch part becomes thinner as approaching a rim part of the small punch part is provided to a bottom face of the small punch part; and a second step of forming a protrusion by way of a punch unit in which the bottom face of the small punch part is a level surface.

9 . A formed article comprising:
a flat part of thickness T; and a protrusion that projects from a side of one surface of the flat part, wherein a first concave part having a first width S 1 , and a second concave part formed by further indenting from the first concave part and having a second width S 2 , are formed on a side of another surface of the protrusion of the formed article, and wherein a thickness d 2 of a side wall part of the second concave part, and the thickness T of the flat part satisfy the relationship of d 2 <T.

10 . The formed article according to claim 9 , wherein
H≥T, when defining a height H as a height from the one surface of the flat part until a top face of the side of the one surface of the protrusion.

11 . The formed article according to claim 9 , wherein
a width S 1 of the first concave part, width S 2 of the second concave part, and width S 3 of the protrusion at the side of the one surface satisfy the relationship of S 2 <S 3 <S 1 .

Assignees

• Nisshin Steel Co Ltd

Inventors

• Nishijima Shinnosuke
• Tomimura Kouki

Classifications

• B21K1/30

  with gear-teeth · CPC title

• B21D37/12

  Particular guiding equipment, {e.g. pliers}; Special arrangements for interconnection or cooperation of dies · CPC title

• B21D28/16

  Shoulder or burr prevention {, e.g. fine-blanking} · CPC title

• B21D28/343 Primary

  Draw punches · CPC title

• B21D53/28

  gear wheels · CPC title