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Patent Searching and Data


Title:
ELASTIC DUAL-SUPPORT VARIABLE-DIAMETER MANDREL USED FOR AIRCRAFT ENGINE METAL CONDUIT BENDING
Document Type and Number:
WIPO Patent Application WO/2020/228840
Kind Code:
A1
Abstract:
An elastic dual-support variable-diameter mandrel used for aircraft engine metal conduit bending, said mandrel comprising a frame holding tube (1), an elastic outer frame (2) and an inner hydraulic component (3); in the inner hydraulic component, an inner cavity of an elastic film (6) is filled with a liquid, a tail end of the elastic film is provided with an opening, the opening is connected to a liquid conveying tube (4) via a tube connector (5), and the other end of the liquid conveying tube is externally connected to a hydraulic system; the elastic outer frame is a flexible integrated body composed of a pull rod (12) and an elastic mesh structure (13), the pull rod being divided into three sequentially connected portions, namely an elastic traction section (9), a straight section (10) and a pull ring (11), the elastic mesh structure mainly being composed of multiple layers of wave-shaped metal circumferential strips (7) and a plurality of anti-fatigue elastic connecting pieces (8) connected in a mesh; the frame holding tube is sleeved on the outside of the elastic outer frame/inner hydraulic component. The variable-diameter mandrel has a variable diameter, can adapt to processing requirements for aircraft engine metal bent pipes of different sizes, saves production costs, and effectively prevents wrinkling and cross-section flattening formation defects during bending.

Inventors:
ZHANG SHUYOU (CN)
FU MENGYU (CN)
WANG ZILI (CN)
YI GUODONG (CN)
Application Number:
PCT/CN2020/095153
Publication Date:
November 19, 2020
Filing Date:
June 09, 2020
Export Citation:
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Assignee:
UNIV ZHEJIANG (CN)
International Classes:
B21D9/00
Foreign References:
CN110102618A2019-08-09
CN203599321U2014-05-21
CN103341536A2013-10-09
CN107138569A2017-09-08
JPH11342427A1999-12-14
EP0901847A11999-03-17
Attorney, Agent or Firm:
HANGZHOU QIUSHI PATENT OFFICE CO., LTD. (CN)
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