材料期刊网

基于修正 Archard 磨损模型，采用数值模拟方法系统分析了 GH4169合金反挤压成形过程中各挤压工艺参数对模具磨损的影响规律。结果表明：在选取的参数范围内，挤压凸模最易产生磨损失效的区域为凸模圆角处，模具最大磨损深度随凸模圆角半径及坯料预热温度的增大而降低，随摩擦系数的增大而增大；当挤压速率小于100 mm ／s时，模具最大磨损深度随挤压速率的增大而减小，当挤压速率大于100mm ／s 时，模具最大磨损深度随挤压速率的增大先增大后减小。最佳工艺参数坯料预热温度1020℃，摩擦系数0．05，变形速率100mm ／s，模具预热温度300℃时模具磨损量最小，为9．28×10－3 mm。

Based on the modified Archard wear model,the effects of process parameters on the die wear during backward extrusion of GH4169 superalloy were systematically analyzed by numerical simulation.The results show that within the experimental data,the most prone wear area of the punch is rounded corner,the maximum wear depth of the die is decreased with the increase of the radius of rounded corner and billet temperature,but increased with the increase of friction factor.Also the maximum wear depth of the die is de-creased with the increase of speed when the forming speed is less than 100mm /s,but when the forming speed is more than 100mm /s, the maximum wear depth of the die is increased first and then decreased with the increase of forming speed.When the optimal parame-ters are the billet temperature of 1020 ℃,the friction factor of 0.05,the extrusion speed of 100mm /s and the die temperature of 300℃,the wear depth of the die is the smallest,about 9.28 ×10 -3 mm.