Author(s)

Y. Yu, Z. Yang, J. Chen & D. O. Northwood

Abstract

Numerical simulation experiments using Dynaform were performed for the press forming of the front and rear roof beams of a medium-duty truck CA1092 produced by the First Automobile Factory of China. The production route for both beams involves blanking, press punching, trimming and true-up: pressing in the major production step. These beams were being produced using construction steel (St 13) sheets. As part of an initiative to reduce vehicle weight, and thereby improve performance, the company wished to replace the St13 steel sheets with high-strength steel (BH340) sheets. Press forming simulation results for BH340 steel using the same forming parameters (tool velocity, binder force, friction coefficient) as for St13 steel showed a serious tendency for the parts to wrinkle and crack. Modification of the forming parameters eliminated the cracking of the BH340 sheets and improved the thickness uniformity compared to beams made from the St13 steel sheets. Keywords: front beam and rear beam of truck, Dynaform, numerical simulation, high-strength steel. 1 Introduction Since the late 1970s and early 1980s, many countries in the world began using high-strength steel to produce automotive body components [1, 2]. In recent years, high-strength steel consumption has increased year by year. Reducing

Keywords

front beam and rear beam of truck, Dynaform, numerical simulation, high-strength steel