Testing device and testing method for establishing high-temperature formed limit diagram of ultrahigh-strength boron steel plate

Abstract

The invention relates to a testing device for establishing a high-temperature formed limit diagram of an ultrahigh-strength boron steel plate. The testing device comprises an upper die frame and a lower die frame, wherein the lower die frame is provided with a plurality of guide posts, the upper die frame is sleeved on the guide posts, the lower surface of the upper die frame is provided with a male die device, and the lower die frame is provided with a blank holder and a female die which correspond to the position of the male die device and are stacked up and down and fixed together through a connector; the upper die frame and the lower die frame are provided with a cooling water passage respectively; heaters are arranged in a male die, the female die and the blank holder; and a temperature probe is arranged at the inner end of the male die. Meanwhile, the invention also discloses a testing method using the device. By combining the high-temperature expansion test requirement of the ultrahigh-strength steel plate, the formed limit diagram of the ultrahigh-strength steel plate at a certain specific high temperature is obtained by thermal forming limit test. The device and the method have significance for researching the forming performance of the ultrahigh-strength boron steel plate for an automobile, and can promote the popularization and application of ultrahigh-strength boron steel in the field of automobiles.

Description

technical field [0001] The invention relates to a forming limit diagram test device and a test method, in particular to a test device and a test method for establishing a high-temperature forming limit diagram of an ultra-high-strength boron steel plate. Background technique [0002] At present, with the increasingly prominent energy and environmental issues, and the improvement of people's requirements for the safety, reliability, and comfort of cars, major automakers are trying to improve the structural design of cars and find new alternative materials. Reduce the weight of the car; continuously improve and adopt new parts manufacturing processes to improve product quality. As new materials, the research and use of advanced high-strength steel and ultra-high-strength steel further meet the demand for lightweight while improving the crash resistance of automobiles. However, ultra-high-strength steel has poor deformation ability at room temperature, and the traditional cold...

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Problems solved by technology

However, the device is not equipped with a heating and cooling control system, and the temperature cannot be controlled. Therefore, the forming limit of the sample at high temperature cannot be tested, and only the forming limit of the sample at room temperature can be obtained.

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