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以手把体为例,综合考虑应变速率及变形温度对材料微观组织结构和性能的影响,运用DEFORM材料库中的应力应变数据,建立了45钢的热加工图,初步为手把体锻造提供合适的工艺参数范围.进一步以初始锻造温度、飞边槽桥部高度、模具下压速率为优化变量,以锻件最大损伤值、终锻成形载荷、坯料填充率为优化目标,采用Design-Expert软件进行了响应面拟合建模分析,得到三个目标量的二阶响应面模型,并进行优化分析,经数值模拟验证其误差范围小于5%.生产实践结果表明:多目标优化后的工艺参数能够获得形貌完整的锻件,并有效地减小最大损伤值,降低成形载荷,显著地提高了材料利用率.
Considering the influence of strain rate and deformation temperature on the microstructure and properties of the material, taking the handle body as an example, the hot working drawing of 45 steel was established by using the stress and strain data in the DEFORM material library. And the optimum process parameters range.Furthermore, the optimal forging temperature, the height of the flash bridge and the rate of die pressing were taken as optimization variables, and the maximum damage value, the final forging load and the blank filling rate were optimized by using Design-Expert software The response surface fitting modeling analysis was carried out, and the second order response surface model of three target quantities was obtained and optimized, and its error range was verified to be less than 5% by numerical simulation.Production practice results show that the multi-objective optimized process parameters Can obtain a complete shape forgings, and effectively reduce the maximum damage value, reduce the forming load, significantly improve the material utilization.