先进高强度钢拉深工艺参数优化

Optimization on drawing process parameters for advanced high-strength steel

以厚度为0.8 mm的DP1180先进高强度钢板料拉深成形为例,利用HIF-60小松伺服压力机的拉深成形系统速度和压边力可调的特点,对其进行拉深极限测定实验。通过室温下的拉深实验得到了该板料在室温下的极限拉深直径为Ф54.50 mm,极限拉深比LDR为2.07。通过只改变单一变量,进一步研究了在不同的压边力、冲压速度以及润滑条件下的极限拉深直径,以及对应的各工艺参数下的LDR值。通过正交实验来设计优化方案,通过方差分析得到了影响先进高强度钢DP1180拉深工艺的因素的主次顺序为:压边力>润滑>冲压速度,通过极差分析得到了最优参数组合为:压边力为10 kN、采用油脂润滑、冲压速度为5 mm·s^(-1)。对优化后的参数组合进行验证,实验表明:优化后的拉深成形件成形效果良好,无明显缺陷,且室温下的极限拉深直径增大为Ф55.75 mm,极限拉深比增大为2.12。

For the deep drawing of advanced high-strength steel DP1180 sheet material with 0.8 mm,the drawing limit measurement ex-periment was carried out by adjusting speed and blank holder force in the deep drawing system of servo press Komatsu HIF-60,and the limit drawing diameter ofФ54.50 mm and the limit drawing ratio of 2.07 for this sheet material were obtained by the drawing experiment at room temperature.Then,the limit drawing diameter under different blank holder forces,stamping speeds and lubrication conditions,and the LDR values under the corresponding process parameters were further studied by changing only a single variable,and the optimiza-tion scheme was designed by the orthogonal experiment.Furthermore,through the variance analysis,the primary and secondary order of influencing factors affecting the deep drawing process of advanced high-strength steel was obtained as follows:the blank holder force,the lubrication,the stamping speed,and the optimal combination of parameters was obtained with the blank holder force of 10 kN,the grease lubrication,and the stamping speed of 5 mm·s^(-1) by the range analysis.The verification experiment of the optimized parameter combina-tion shows that the optimized deep drawing part has good forming effect without obvious defects,and the limit drawing diameter and the limit drawing ratio at room temperature is increased toФ55.75 mm and 2.12,respectively.