JPS6250821U

JPS6250821U -

Info

Publication number: JPS6250821U
Application number: JP14062585U
Authority: JP
Priority date: 1985-09-12
Filing date: 1985-09-12
Publication date: 1987-03-30

Description

[Brief explanation of the drawing]

第１図は本考案の実施例のベンド加工用プラグ
の半部縦断側面図、第２図はそのベアリング部の
寸法関係を示す断面図、第３図は先行技術のベン
ド加工方法の曲げ加工途中の状態を示す図、第４
図はじやばらの発生した不良ベンドの縦断側面図
、第５図はプラグマークの発生した不良ベンドの
縦断側面図、第６図はメタルかぶさり疵の発生し
た不良ベンドの部分破断斜視図、第７図は本考案
と異なる参考目的のプラグの半部縦断側面図であ
る。１……主部、２……取付ねじ部、３……後部ベ
アリング部、４……前部ベアリング部、５……逃
げ面部、６……曲率部、ｌ……間隔、Ｄ_１，Ｄ_２……外径、θ……逃げ角、ｗ……幅、ａ……直管
状素管、ｂ……曲率付与ロール、ｃ……曲げ加工
ロール、ｄ……押え金、ｅ……プラグ、ｆ……取
付用芯金、Ｇ……じやばら、Ｐ……プラグマーク
、Ｍ……メタルかぶさり疵、Ｔ……テーパ面。 Fig. 1 is a vertical cross-sectional side view of a half part of a plug for bending according to an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the dimensional relationship of the bearing part, and Fig. 3 is a half-part vertical side view of a plug for bending according to an embodiment of the present invention. Figure 4 showing the state of
Figure 5 is a longitudinal side view of a defective bend with cracks and burrs, Figure 5 is a longitudinal side view of a defective bend with plug marks, Figure 6 is a partially cutaway perspective view of a defective bend with metal overlapping flaws, and Figure 7 The figure is a half-part longitudinal sectional side view of a plug for reference purposes that is different from the present invention. 1... Main part, 2... Mounting screw part, 3... Rear bearing part, 4... Front bearing part, 5... Relief surface part, 6... Curvature part, l... Interval, D ₁ , D ₂ ...Outer diameter, θ... Relief angle, w... Width, a... Straight pipe, b... Curvature imparting roll, c... Bending roll, d... Presser foot, e... Plug, f ...Core metal for installation, G...Rubber, P...Plug mark, M...Metal cover flaw, T...Tapered surface.

Claims

[Scope of utility model registration request]

A straight tube is held between the curvature imparting roll and the bending roll by optionally interposing a presser foot, and a plug of the inner diameter of the tube or a slightly larger diameter is inserted between the centers of the two rolls or the center of the tube using a mounting core. In the bending method, the plug is retracted slightly backward, and then the bending roll and the plug attached to the core metal are simultaneously rotated around the center of the curvature imparting roll to perform the bending process. A plug for bending, characterized in that it has bearing parts for forming an inner diameter that are to be located slightly forward and rearward, and that relief parts with a slight angle are formed at the front and rear of the bearing part via a curvature part to form a claw-like shape. .