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摘要：
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以汽车变强度后纵梁零件为研究对象，采用板料整体加热、模具差速冷却板料的热成形工艺，对后纵梁零件的生产工艺进行了优化。相对于等强度后纵梁零件的热成形工艺，变强度热成形工艺在软区增加了加热系统，降低了零件软区的冷却速率，在零件硬区和软区实现差速冷却，最终得到变强度后纵梁零件。模具设计首先是基于该零件的变强度特性以及结构特点，基于热成形工艺技术，对整个零件成形后硬区和软区的温度分布、硬度分布和马氏体相含量分布进行了成形数值模拟。通过数值模拟优化了后纵梁零件的成形工艺参数，并将优化后的工艺参数用于指导零件的实际生产。通过对试制零件硬区和软区的屈服强度、抗拉强度、伸长率、硬度、变薄率和微观组织的检测和分析，显示试制的变强度后纵梁零件达到设计要求。
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For automobile rear beam parts with variable strength, the production process of rear beam parts was optimized by the hot forming process of overall heating of sheet metal and die differential cooling sheet. Compared to the hot forming process of equal-strength rear beam parts, the variable-strength hot forming process added a heating system in the soft zone, reduced the cooling rate in the soft zone of the part, achieved differential cooling in the hard and soft zones of the part, and finally obtained the rear beam parts with variable strength. Firstly, the die was designed based on the variable strength characteristics and structural characteristics of parts, and the distributions of temperature, hardness and martensitic phase content in the hard and soft zones of the whole part after forming were simulated numerically by the hot forming process. Then, the forming process parameters of rear beam parts were optimized by numerical simulation, and the optimized process parameters were adopt to guide the actual production of parts. The yield strength, tensile strength, elongation, hardness，thinning ratio and microstructure in the hard and soft zones of the trial parts were tested and analyzed. The results show that the rear beam parts with variable strength meet the design requirements.
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基金项目：
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作者简介：
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周杰(1965-),男，博士，教授，E-mail：zhoujie@cqu.edu.cn；通讯作者：谈顺强（1980-），男，硕士，工程师，E-mail：tanshunqiang@126.com
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参考文献：
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