JPH0189833U

JPH0189833U -

Info

Publication number: JPH0189833U
Application number: JP18285187U
Authority: JP
Priority date: 1987-11-30
Filing date: 1987-11-30
Publication date: 1989-06-13

Description

[Brief explanation of drawings]

第１図から第４図までの図面は、この考案の実
施例を示しており、第１図は固定ポンチの要部を
示す図面、第２図はせん孔押出し工程を示す要部
断面図、第３図はせん孔押出し工程を示す要部断
面図、第４図は打ち抜き工程を示す要部断面図、
第５図は打ち抜きポンチの座部の折損部位を図面
、第６図から第１１図までの図面は、従来例を示
しており、第６図は素材の一側を固定ポンチによ
つてせん孔押出しする工程を示す断面図、第７図
は素材の他側をポンチによつてせん孔押出しする
工程を示す断面図、第８図は素材の節部を打ち抜
きポンチによつて打ち抜く工程を示す断面図、第
９図はせん断部と破断部を示す断面図、第１０図
は破断部に生じるバリを示す断面図、第１１図は
破断部近傍に付着する切りくずを示す断面図であ
る。３……固定ポンチ、４……素材、４ａ……一側
、４ｂ……他側、５……一方のせん孔押出し部、
６……先端角部、７……カツト成形部、９……ポ
ンチ、１０……他方のせん孔押出し部、１１……
節部、１２……打ち抜きポンチ。 The drawings from FIG. 1 to FIG. 4 show an embodiment of this invention. Figure 3 is a sectional view of the main part showing the punching and extrusion process, Figure 4 is a sectional view of the main part showing the punching process,
Figure 5 shows the broken part of the seat of the punch, Figures 6 to 11 show the conventional example, and Figure 6 shows one side of the material being punched with a fixed punch. 7 is a cross-sectional view showing the process of punching out holes on the other side of the material with a punch, and FIG. 8 is a cross-sectional view showing the process of punching out knots of the material with a punch. FIG. 9 is a cross-sectional view showing the sheared part and the fractured part, FIG. 10 is a cross-sectional view showing burrs generated at the fracture part, and FIG. 11 is a cross-sectional view showing chips adhering to the vicinity of the fracture part. 3... fixed punch, 4... material, 4a... one side, 4b... other side, 5... one hole extrusion part,
6... Tip corner part, 7... Cut forming part, 9... Punch, 10... Other punching part, 11...
Knot, 12... Punch punch.

Claims

[Scope of utility model registration request]

One side of the material is cold forged with a fixed punch and extruded through holes to form one extruded hole section.
In a hole extrusion punching device in which the other side of the material is extruded with a punch to form the other perforation extrusion part, a knot in the center of the material is punched out with a punch, and a chamfer-like cut is formed on the tip corner of the fixed punch. The tip corner is rounded with a radius of 0.1 to 0.2 mm,
A hole extrusion punching device characterized in that the cut forming portion is formed into a round shape with a radius of 1.5 mm or more, and the angle of the cut forming portion is formed to be 35 degrees or less.