Method for realizing gradient property distribution of hot stamping workpiece

Abstract

The invention provides a method for realizing gradient property distribution of a hot stamping workpiece, comprising the following steps of: according to property requirements on the hot stamping workpiece, determining the mechanical properties that the hot stamping workpiece is necessary to have in different positions; according to the relationship between the final mechanical property and a cooling speed in the quenching process, determining the cooling speeds of the different positions of the hot stamping workpiece at the hot stamping quenching stage; determining the position of a thermal barrier coating needing to be formed on the inner surface of a mould, the material of the thermal barrier coating and the thickness of the thermal barrier coating according to the obtained corresponding cooling speeds of the hot stamping workpiece at different positions; forming the thermal barrier coating in a corresponding position of the mould in a corresponding way; performing moulding and quenching treatment on a plate through a hot stamping process to obtain the hot stamping workpiece, and realizing the gradient distribution of the mechanical properties by virtue of the difference of the cooling speeds at different positions of the hot stamping workpiece. The method is simple and convenient to implement so that lots of manufacture cost and production period are saved; the method is also flexible and efficient to use.

Description

technical field [0001] The invention relates to a hot stamping method, in particular to a method for realizing gradient performance distribution of hot stamping parts. Background technique [0002] At present, the application of ultra-high-strength steel has become one of the mainstream development trends in automobiles and other manufacturing fields, and hot stamping is an important way to realize ultra-high-strength steel parts. The process flow adopted by the existing hot stamping forming technology is as follows: select special hot stamping material - blanking - heating and heat preservation of the sheet (the sheet is fully austenitized) - move to the mold - quenching while forming Cooling—ultimately obtain ultra-high-strength stamped parts (the structure is martensite, and the strength is around 1500MPa or even higher). For anti-collision parts in the modern automobile industry, different parts of the same part are required to have different mechanical properties (ie, ...

AI Technical Summary

Problems solved by technology

These methods generally need to design and manufacture different molds according to the different performance requirements of the parts, and need to go through multiple mold repairs and debugging tests. There are unfavorable factors such as complex design, long production cycle, and high cost.

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