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分析了铝合金管空拉拔模具的磨损机理,在Deform3D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。
The wear mechanism of the aluminum alloy tube drawing die is analyzed, and a finite element model of wear based on thermodynamic coupling is established in Deform3D. Archard wear model was used to study the influence of drawing speed, drawing length and friction factor on drawing die wear. The results show that the obvious wear zone of the die is the end of conical deformation zone. The maximum depth of die wear increases approximately linearly with the drawing speed and drawing length at the initial stage of drawing, decreases with the increase of friction coefficient and ranges from 0.02 to 0.06 and 0.2 ~ 0.3 range of wear and tear to reduce a great extent, and the friction coefficient is greater than 0.4, the change is very gentle, and in the vicinity of 0.3 minimum wear depth. This drawing process and mold design and mold life prediction provides a theoretical basis.