Springback Experimental Research of Advanced High-strength Steel

摘要

Springback is one of the major problems of high strength steel .Based on the NUMISHEET'96 S_Rail standard examination questions,using the characteristics of the servo press 200T,the blank holder force,different pressure holding time and the holding times of advanced high strength steel DP280-440, DP340-590, DP400-780 are studied. By changing one of the three impact factors ,three group experiments are carried out.The experimental results show that the springback can change evidently with the increasing of the blank holder force and the holding times.but the holding time has little influence on the springback.What's more,the springback angle of DP400-780 is the biggest .proving the higher the yield stress,the bigger the springback angle.Therefore, in the stamping of advanced high strength steel, increasing the blank holder force and holding times are effective methods to solve the springback.