公开(公告)号：US20010052253A1

公开(公告)日：2001-12-20

申请号：US09878085

申请日：2001-06-08

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki Okada ,  Tsutomu Furuyama

IPC: B21D015/06

CPC classification number: B21D15/10 ,  Y10T29/49877

Abstract: A manufacturing method for manufacturing a bellows having pleat walls with S-shaped profiles comprises a primary forming process for forming a formed bellows, a pressing process for compressing the formed bellows in the axial direction, and a stretching process for pulling the compressed bellows in the axial direction, thereby obtaining desired pitches and free length. After the stretching process is carried out, the bellows is subjected to an annealing and ageing heat-treatment process. An apparatus for manufacturing the bellows comprises a pair of molds that have their respective forming surfaces in shapes corresponding individually to the pleat walls. The die is slightly retreated away from the pleat walls just before the dies open in the diametrical direction after the pleat walls are formed.

Abstract translation: 用于制造具有S形轮廓的褶皱壁的波纹管的制造方法包括用于形成成形波纹管的初级成形工艺，用于沿轴向压缩所形成的波纹管的压制工艺，以及用于将压缩波纹管拉在 轴向，从而获得期望的间距和自由长度。 在进行拉伸处理之后，对波纹管进行退火和时效热处理。 一种用于制造波纹管的装置包括一对模具，它们各自的形状表面的形状分别对应于褶皱壁。 在褶皱壁形成之后，模具在刚好在直径方向上打开之前的褶皱壁稍微退缩。