(南方冶金学院材料工程系， 赣州 341000)
摘 要: 应用工程法对双金属管衬拉复合过程进行了分析，提出了双金属管衬拉时的三种流动模式及几何判据： (1) 当0≤β＜β0时， 为复层变薄流动模式；(2) 当β0＜β≤α时， 为芯层变薄流动模式； (3) 当β=β0时， 为比例流动模式。推导出了双金属管衬拉拉拔力的计算公式。 结果表明， 理论计算值与实测值的相对误差约小于15%。
关键字: 关键词: 双金属管 衬拉 拉拔力 工程法
（Department of Materials Engineering, Southern Institute of Metallurgy,Gangzhou 341000, P. R. China）
Abstract:It was analysed theoretically that the loads of bimetal tube drawing with a fixed plug by using slab method, and its three flow models and corresponding geometry criteria were proposed: (1) while 0≤β＜β0, it is the model of the coating getting thinner;(2) while β0＜β≤α, it is the model of the core getting thinner;(3) while β=β0, it is the model of homogenous flow. A formula on loads for bimetal tube drawing with a fixed plug is derived, experimental results show that the relative errors between theorectical values and the measured ones are about less than 15%, which can meet the demands of engineering calculation.
Key words: bimetal tube drawing with a fixed plug drawing loads
slab method
