Title:
HOT EXTRUSION DIE FOR IRREGULARLY SHAPED RECTANGULAR TUBING, AND HOT EXTRUSION INTEGRAL MOLDING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/208999
Kind Code:
A1
Abstract:
A hot extrusion die for irregularly shaped rectangular tubing comprises a die cavity sleeve (1) having an irregularly shaped cavity. A hot extrusion mandrel (2) is provided within the die cavity sleeve. A region between the die cavity sleeve and the hot extrusion mandrel constitutes an irregularly shaped rectangular tubing die cavity hole. A first extrusion flow guide hole and a second extrusion flow guide hole are provided below the irregularly shaped rectangular tubing die cavity hole. An overall centroid of the irregularly shaped rectangular tubing die cavity hole is located at a center position of a radial cross section of the die cavity sleeve. Further disclosed is a hot extrusion integral molding method for irregularly shaped rectangular tubing. The method comprises: step 1, heating a billet and reaming; step 2, re-heating the billet after the reaming; step 3, performing hot extrusion on the billet by using an irregularly shaped rectangular tubing hot extrusion die; and step 4, air cooling hot extruded irregularly shaped rectangular tubing to room temperature, and examining surface quality and mechanical properties of the irregularly shaped rectangular tubing. Irregularly shaped rectangular tubing manufactured by the method provides superior surface quality and high dimensional precision, and has performance indicators that meet design requirements and overall quality that meets industrial application requirements.
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Inventors:
LIU ZHENBAO (CN)
WANG XIAOHUI (CN)
LIANG JIANXIONG (CN)
SUN YONGQING (CN)
WANG CHANGJUN (CN)
YANG ZHIYONG (CN)
GAO YUGUANG (CN)
GAO JIE (CN)
LIU FUQIANG (CN)
ZHANG AILIANG (CN)
WANG XIAOHUI (CN)
LIANG JIANXIONG (CN)
SUN YONGQING (CN)
WANG CHANGJUN (CN)
YANG ZHIYONG (CN)
GAO YUGUANG (CN)
GAO JIE (CN)
LIU FUQIANG (CN)
ZHANG AILIANG (CN)
Application Number:
PCT/CN2021/087462
Publication Date:
October 21, 2021
Filing Date:
April 15, 2021
Export Citation:
Assignee:
CENTRAL IRON AND STEEL RES INSTITUTE (CN)
HANDAN XINXING SPECIAL STEEL PIPES CO LTD (CN)
HANDAN XINXING SPECIAL STEEL PIPES CO LTD (CN)
International Classes:
B21C25/02; B21C23/08; B21C23/21; B21C29/00; B21C31/00; B21D37/16; B21D41/02
Foreign References:
| CN111451309A | 2020-07-28 | |||
| CN107350301A | 2017-11-17 | |||
| CN109604360A | 2019-04-12 | |||
| CN105414240A | 2016-03-23 | |||
| JP1029011A |
Attorney, Agent or Firm:
FANG & ASSOCIATES (CN)
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