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针对44 mm×10.5 mm小规格Ti Ni Nb管材反挤压成形试验的工艺参数确定和模具设计问题,采用有限元热力耦合数值模拟和单因素轮换法,分析在满足制件成形质量(挤出温度低于共晶熔点)的前提下,挤压力与凹模模角和定径带长度、凹模和挤压筒温度、毛坯初始温度、挤压速度及摩擦因子等工艺参数和模具结构参数之间的关系,确定影响挤压力的主要工艺参数和模具结构参数分别为凹模模角、初始坯料温度、挤压速度和摩擦因子,并给出上述参数的取值范围。通过基于数值模拟的正交试验方法,得到了主要工艺参数和模具结构参数的最佳组合,即在保证润滑效果的前提下,取凹模模角110°、毛坯初始温度为950℃、挤压速度为50 mm/s。利用铅和45号钢毛坯在6.5 MN多向模锻挤压液压机上进行了验证实验。
According to the determination of the process parameters and the mold design of 反44 mm × 10.5 mm Ti Ni Nb pipe by reverse extrusion test, the FEM numerical simulation and single-factor rotation method were used to analyze the quality of the formed part The temperature is lower than the eutectic melting point) under the premise of the extrusion force and the die angle and sizing the length of the die and extrusion cylinder temperature, the initial temperature of the blank, extrusion speed and friction factor and other process parameters and mold structure parameters The main process parameters and mold structure parameters that affect the squeezing force are die angle, initial blank temperature, extrusion speed and friction factor, and the range of the above parameters is given. The optimum combination of the main process parameters and the structural parameters of the mold was obtained through the orthogonal experiment based on numerical simulation. Under the premise of guaranteeing the lubrication effect, the die angle was 110 °, the initial temperature of the blank was 950 ℃, Speed of 50 mm / s. The use of lead and 45 steel blank in 6.5 MN multi-die forging extrusion hydraulic press validation experiments.