锻压技术

铝合金强力旋压变形区温度变化规律

英文标题：Behavior changes of temperature of deformation zone in aluminum alloy during power spinning process

作者：柴国强李德富

单位：北京有色金属研究总院

关键词：强力旋压变形热壁厚减薄率

分类号：TG146.2

出版年,卷(期):页码：2015,40(11):112-116

摘要：

建立了铝合金薄壁精密筒形件三旋轮强力旋压变形区温度变化数学模型，计算并分析了变形区温度变化规律及其对旋压工艺的影响。研究结果表明：多道次强力旋压时，变形区温度最高升温约160 ℃，变形区金属的变形抗力明显降低约40 MPa；在分析变形区温度变化对壁厚减薄率影响规律的基础上，提出了壁厚减薄率一致性的概念，为薄壁高精度铝合金筒形件旋压提供了理论参考。旋压变形区温度变化导致旋压坯料在厚度方向上产生热膨胀，最大热膨胀量达85 μm，名义减薄率与实际减薄率不一致，壁厚减薄误差率达12%。

The mathematical model of temperature changes in three roller power spinning deformation zone was built for the aluminum alloy thin-walled precision cylindrical parts. The change regularity of temperature in the deformation zone and its influence on spinning process were calculated and analyzed. The results show that the temperature in the deformation zone rises up to 160 ℃ and the deformation resistance reduces by 40 MPa obviously. Based on the influence of changing temperature in the deformation zone on thickness reduction ratio, the conception of consistency was proposed, which provided a theoretical guidance for the spinning of cylindrical parts of thin-walled high-precision aluminum alloy. The thermal expansion in the thickness direction of the blank is caused by the temperature change of the spinning deformation zone, and the maximum thermal expansion amount is up to 85 μm. The nominal thinning rate is inconsistent with the actual thinning rate, and the error rate of wall thickness reduction is 12%.

基金项目：

国家科技支撑计划资助项目(2011BAE23B02)

柴国强（1983-），男，博士研究生，工程师

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