The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2024
Filed:
Apr. 15, 2021
Central Iron and Steel Research Institute, Beijing, CN;
Handan Xinxing Special Steel Pipes Co. , Ltd., Beijing, CN;
Zhenbao Liu, Beijing, CN;
Xiaohui Wang, Beijing, CN;
Jianxiong Liang, Beijing, CN;
Yongqing Sun, Beijing, CN;
Changjun Wang, Beijing, CN;
Zhiyong Yang, Beijing, CN;
Yuguang Gao, Beijing, CN;
Jie Gao, Beijing, CN;
Fuqiang Liu, Beijing, CN;
Ailiang Zhang, Beijing, CN;
CENTRAL IRON AND STEEL RESEARCH INSTITUTE, Beijing, CN;
HANDAN XINXING SPECIAL STEEL PIPES CO., LTD., Beijing, CN;
Abstract
A hot extrusion die for a special-shaped square pipe includes a die cavity sleeve with a special-shaped cavity. A hot extrusion mandrel is arranged in the die cavity sleeve. An area between the die cavity sleeve and the hot extrusion mandrel forms a die cavity hole. A first extrusion diversion hole and a second extrusion diversion hole are arranged below the die cavity hole. An integral centroid of the die cavity hole is located at a circle center of a radial cross section of the die cavity sleeve. Further disclosed is a hot extrusion integral forming method for a special-shaped square pipe, including: heating and expanding a blank material; heating the blank material again after expanding; performing hot extrusion on the blank material; and cooling the formed special-shaped square pipe in air to a room temperature, and inspecting surface quality and mechanical properties of the special-shaped square pipe.