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。

公开(公告)号：US20030126732A1

公开(公告)日：2003-07-10

申请号：US10337566

申请日：2003-01-07

Applicant: NHK Spring Co., Ltd.

Inventor： Hideki Okada

IPC: B23P019/04

CPC classification number: B21D15/10 ,  Y10T29/49805 ,  Y10T29/49877 ,  Y10T428/12292

Abstract: In a method of fabricating a bellows by bulge forming, an annealing step is carried out during the bulge forming process of the bellows so that the capability of the material to elongate is recovered, and the workability of the bellows is improved in effect. In particular, the ratio of the outer diameter to the outer diameter can be made greater than a value that can be achieved by a single forming step. Therefore, the deflection (stroke) of each annular bulge or pleat can be increased for a given stress or the number of annular bulges and the length of the bellows can be decreased for a given stroke of the bellows.

Abstract translation: 在通过凸起成形制造波纹管的方法中，在波纹管的凸起形成过程期间执行退火步骤，使得材料伸长的能力被恢复，并且波纹管的可加工性有效地得到改善。 特别地，外径与外径的比可以大于通过单个成形步骤可以实现的值。 因此，对于给定的应力或环形凸起的数量，可以增加每个环形凸起或褶皱的偏转（行程），并且波纹管的给定冲程可以减小波纹管的长度。