摘要
采用有限元法对复杂型腔陶瓷-钢热挤压组合凹模进行了热力耦合分析,以不受拉应力为目标对其进行了结构优化。通过对温度场和应力场的分析,发现组合凹模内壁存在较大温度梯度,组合凹模所受最大拉应力集中于其工作腔内壁。对热挤压时陶瓷-钢组合凹模的入模角度和过盈量进行了优化,研究发现随着入模角度的增加组合凹模所受最大拉应力先降低后略有增加。当入模角度大于130°时,组合凹模所受最大拉应力达到最小值;随着过盈量的增加组合凹模所受最大拉应力先降低后略有增加,最佳过盈量为0.18 mm。
The thermo-mechanical coupled analysis of the ceramic-steel concaving die with complex cavity for hot extrusion is studied with the finite element method. The criterion of optimization of the die structure is minimization of the bearing tensile stress in the die cavity. By analyzing the temperature field and stress field, it is found that there is a great temperature gradient in the inner wall of the die, and the maximum tensile stress is concentrated in the inner working cavity of the die. The die angle and the interference of the ceramic-steel die are optimized for hot extrusion. With the increase of the die angle, the maximum tensile stress is reduced firstly and then increased slightly. When the die angle is greater than 130 ~, the maximum tensile stress that the die born reaches the minimum. With the increase of the interference, the maximum tensile stress is reduced firstly and then increased slightly, and the best interference quantity is O. 18 mm.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第8期1688-1692,共5页
Journal of Synthetic Crystals
基金
教育部新世纪优秀人才支持计划资助项目(NCET-10-0866)
关键词
陶瓷-钢组合凹模
热挤压
结构优化
热力耦合分析
ceramic-steel concaving die
hot extrusion
structure optimization
thermo-mechanicalcoupled analysis
