摘要
在分析了薄壁锥形件拉深过程中侧壁压缩失稳破坏方式后,利用薄板在板平面内难以承受压应力,锥壁纬向收缩靠经向拉伸的变形特点,根据薄壁锥形件小端危险面所能提供的最大经向拉应力,求得了锥壁纬向无压缩失稳的最大相对拉深高度;从而建立了薄壁锥形件拉深侧壁无压缩失稳的条件。针对板材性能的影响,提出了相对锥顶半径特征方程和特征值的概念。以SPCC深拉深钢板和S754铝合金板的试验表明,理论计算与实测结果相近。
After analyzing the failure of the compression instability of sidewall during tapered shell drawing, making use of speci- ality that it is hard for the sheet to sustain compression along the sheet and the sheet contracts latitudinally relying on stretches longitudinally during tapered shell drawing. Taking these into consideration, the maximum relative drawing depth is worked out according to the longitudinally maximum tensile stress that the tapered shell drawpiece can endure. Consequently. the forming condition of tapered shell sidewall is established, in which instability does not take place on the sidewall of tapered shell drawpiece. Contraposing the effect of materials capability, the conception of the characteristic equation and eigenvalue of relative cone radius are put forward. Good agreement is found between the theoretical calculations and the results from the experiment that use SPCC deep drawing sheet and S754 Aluminum alloy sheet as workpieces.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2006年第5期72-75,共4页
Journal of Plasticity Engineering
关键词
冲压
拉深
塑性加工
punching
drawing
plastic processing
