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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85μm,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 the temperature variation in the area of severe spinning of aluminum alloy thin-walled precision cylinder was established. The temperature variation in the deformation area and its influence on the spinning process were calculated and analyzed. The results show that the maximum temperature of deformation zone is about 160 ℃ and the deformation resistance of the deformation zone is obviously reduced by about 40 MPa when multi-pass strong spinning. On the basis of analyzing the influence of the temperature variation in deformation zone on the thinning rate , Put forward the concept of thickness thinning rate consistency, providing a theoretical reference for spinning thin-walled high-precision aluminum alloy cylindrical parts. The temperature variation in the spinning zone resulted in the thermal expansion of the spinning blank in the thickness direction. The maximum thermal expansion reached 85μm. The nominal thinning rate was different from the actual thinning rate, and the error rate of wall thickness thinning was 12%.