Title:
HIGH-STRENGTH STEEL TUBE BENDING DIE MANDREL
Document Type and Number:
WIPO Patent Application WO/2022/088448
Kind Code:
A1
Abstract:
A high-strength steel tube bending die mandrel. The die mandrel is a straight rod-type mandrel and comprises a mandrel pull rod (4) and a mandrel body (1). The mandrel pull rod (4) is screwed to the rear end of the mandrel body (1). The shape of the cross section of the mandrel body (1) is adapted to the shape of a steel tube (5). The size of the cross section of the mandrel body (1) is less than the inner diameter of the steel tube (5). When the mandrel body (1) is in the steel tube (5), a unilateral gap between the mandrel body (1) and the steel tube wall is d, wherein 0
Inventors:
LIN JIANWEI (CN)
Application Number:
PCT/CN2020/138259
Publication Date:
May 05, 2022
Filing Date:
December 22, 2020
Export Citation:
Assignee:
ZHANGQUAN HARDWARE PRODUCTS KUNSHAN CO LTD (CN)
International Classes:
B21D9/04
Foreign References:
| CN102049436A | 2011-05-11 | |||
| CN203541265U | 2014-04-16 | |||
| US4538436A | 1985-09-03 | |||
| CN201470735U | 2010-05-19 | |||
| US5749255A | 1998-05-12 | |||
| CN1856375A | 2006-11-01 |
Attorney, Agent or Firm:
JIANGSU CO-FAR LAW FIRM (CN)
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