B1500HS材料热成形后冷冲切试验

目的研究热冲压零件冷冲切刀块易磨损寿命低的问题。方法设计开发一套多功能冷冲切试验模具,对热成形后B1500HS材料进行连续冲切试验,并对3组模具间隙、4种典型模具钢材质对应的冲切试样进行断面质量检测及统计,以此分析热冲压高强钢冷冲切合理模具间隙和典型冷冲切模具钢的冷冲切特性。结果 8%~10%料厚模具间隙在冲切初期毛刺较小,且在连续冲切过程中毛刺高度比较稳定,为合理的模具间隙范围;4种典型模具钢中,ASP60冲头耐磨性性能最优,SKD11冲头耐磨损性最差,SKH-9和CALDIE介于两则之间。结论热冲压钢的冷冲切稳定性及刀块寿命相对常规高强钢还存在较大差距,针对其冲切特性有必要开发更高寿命、高性价比的模具钢及热处理方法,以提高刀块寿命和生产效率,降低零件制造成本。

Cold Cutting of B1500HS Material after Hot Forming

The paper aims to solve the quick abrasion and short life of the cold cutting block for drop stamping parts. A multifunctional cold cutting die was designed and developed to carry out continuous cutting experiment of B1500HS material after hot forming. The section quality of 3 sets of die clearance and 4 kinds of typical die steel material corresponding to the cutting specimens were tested and analyzed to analyze the reasonable die clearance in drop stamping of high-strength steel and the characteristics of typical cold cutting of die steel. For die clearance of 8%~10% blank thickness, the burr was smaller in the initial cutting and the burr height was stable in continuous cutting, which was the reasonable clearance range of cutting die. In 4 kinds of typical die steels, the wear resistance of ASP60 was the best; and that of the SKD11 was the worst. That of SKH-9 and CALDIE was moderate. The cold cutting stability of hot stamping steel and the life of the cutting tool are still quite different from those of conventional high-strength steel, so it is necessary to develop die steel and heat treatment method with longer life and higher cost-performance to improve the life and productivity of the cutting tool and reduce the cost of parts manufacturing.