Thermal forming limit experimental device for metal sheet and testing method

Abstract

The invention relates to a thermal forming limit experimental device for a metal sheet and a testing method. The device comprises a punch (1), a gas one-way valve (2), a seal box (3), a blank holder (4), a die (6), a die pressure lever sealing ring (7), a die hydraulic pump (8), a high-speed camera (9), an air inlet pipe (10), an infrared temperature sensing device (11), a vent hole (12), an illuminating lamp (13), toughened glass (14), a bracket (15), a resistance wire (16), a blank holder support (17), a punch hydraulic pump connecting rod sealing ring (18), a seal box support (19) and a punch hydraulic pump (20). Test pieces can be heated by the thermal forming limit experimental device during experiments, and errors caused by heating a sample outside and transferring the heated sample to a mould are prevented.

Description

technical field [0001] The invention relates to the field of thermal forming processing of metal plates, in particular to a thermal forming limit test device for metal plates. Background technique [0002] High-strength steel generally refers to steel with a cold-rolled tensile strength above 340MPa, a hot-rolled tensile strength above 370MPa, or a yield strength above 210MPa. Due to its high specific strength and good anti-collision performance, it can greatly reduce the weight of automobiles under the same safety conditions, so it has attracted widespread attention in the automobile manufacturing industry. However, high-strength steel plates have poor formability at room temperature and are prone to defects such as wrinkles and cracks. Therefore, hot forming processes are usually used to deform them to obtain qualified parts. [0003] In the normal temperature forming process, there are many ways to evaluate the formability of the sheet, among which the forming limit diag...

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Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a metal plate hot forming limit test device, which can not only solve the forming performance evaluation problem that can be solved by the traditional forming limit diagram, but also provide a method that can accurately and conveniently evaluate the hot forming process of high-strength steel plates. Wrinkling and cracking problems

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