带扩展腔的纯铝及铝钛硼合金连续挤压力的分析与实验研究

摘要

将CONFORM挤压的变形区划分成初始夹紧区、夹紧区、圆锥形扩展腔区、圆柱形挤压筒区和定径区,采用主应力法建立各区力平衡方程,获得了带扩展腔的任意包角连续挤压过程的变形力公式.在自行设计的连续挤压机上对纯铝和铝钛硼合金(Al-5％Ti-1％B)进行实验.采用Gleeble-1500热模拟实验机实测得到铝钛硼合金在变形温度400℃、应变速率3.07 s-1条件下的变形抗力为50MPa.计算得到纯铝和铝钛硼合金带扩展腔连续挤压的变形力.实验用的连续挤压径向力与理论计算的连续挤压径向力一致.%The deformation zone of CONFORM extrusion was divided into primary gripping zone,gripping zone,conical expansion chamber zone,cylindrical zone and sizing zone of die,and corresponding force equilibrium equations were established using the Slab method.The deformation force formulae of CONFORM machine at any wrapping angle with an expansion chamber were obtained.Experiment on pure aluminum and Al-5％Ti-1％B alloy was conducted on the CONFORM machine self-designed.The resistance to deformation of Al-5％Ti-1％B alloy at the deformation temperature of 400 ℃ and the strain rate of 3.07 s-1 was measured to be 50 MPa using Gleeble-1500 thermal simulation machine.The calculation results of deformation forces for CONFORM process with an expansion chamber for pure aluminum and Al-5％Ti-1％B alloy were given.The experimental CONFORM radial force is in agreement with the radial force obtained by theoretical formula.