铝合金管空拉拔模具磨损仿真预测
Simulation Prediction on Wear of Non-mandrel Drawing Die of Al Alloy Tube
夏玉峰1， 佟 莹2， 权国政1
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作者单位：（1. 重庆大学 材料科学与工程学院，重庆 400044；2. 重庆电子工程职业学院，重庆401331）
中文关键字：数值模拟； 空拉拔； 磨损
英文关键字： numerical simulation; non-mandrel drawing; wear
中文摘要：分析了铝合金管空拉拔模具的磨损机理，在Deform 3D中建立了基于热力耦合的磨损有限元计算模型。采用Archard磨损模型研究了拉拔速度、拉拔长度及摩擦因素对拉拔模具损磨的影响规律。结果表明：模具明显磨损区为锥形变形区末端，在拉拔初期模具磨损最大深度随拉拔速度及拉拔长度呈近似线性增加关系，随摩擦系数的增加而减少且在0.02～0.06和0.2～0.3区间磨损降低幅度很大，而摩擦系数大于0.4以后，变化很平缓，并且在0.3附近磨损深度最小。这对拉拔工艺及模具设计以及模具寿命的预测提供了理论依据。
英文摘要：The wear mechanism of non-mandrel drawing die of Al alloy tube was analyzed. The finite element calculation model for wear was built based on thermal-mechanical coupling in Deform 3D. The influence of velocity, length and friction coefficient of drawing on the die wear was researched. The results show that the apparent area of wear is in the end of taper-deformation area, and the deepest depth of wear linearly increases with the increase of velocity and length of drawing. Besides, the deepest depth of wear decreases with the increase of friction coefficient, sharply decreases in range of 0.02～0.06 and 0.2～0.3. When the friction coefficient is beyond 0.4, the deepest depth of wear gently increases with the increase of friction coefficient, the largest depth of wear has an minimal value (near 0.3). These results could offer some references for the design of drawing process and die and the prediction of mould life.