TA15钛合金不等厚V型材挤压模具设计

Design of extrusion die for TA15 titanium alloy V profile with unequal thickness

为了获得无弯曲、无扭拧,且直线度较好的尺寸合格的TA15钛合金不等厚V型材,需要设计合理的钛合金挤压模具,得到出口速度差较小的型材。以TA15钛合金型材为研究对象,采用有限元软件对TA15钛合金挤压过程进行数值模拟,通过调整倒角尺寸、型心位置和夹角大小,优化挤压模具结构,得出无弯曲、无扭拧,且直线度较好的尺寸合格的V型材。模拟结果表明,倒角尺寸越大,截面金属流动速度越快,型心位置越靠近模具中心的金属流动速度越快,夹角描述模孔在模具上的相对位置,极大地影响了挤压型材的截面金属流动速度,在倒角尺寸、型心位置和夹角选取合理的情况下,能设计出较好的挤压模具,得到无弯曲、无扭拧的型材。

In order to obtain the qualified TA15 titanium alloy V-profile with unequal thickness without bending,torsion and good straightness,it is necessary to design a reasonable titanium alloy extrusion die to obtain the profile with small outlet speed difference.In this paper,TA15 titanium alloy profile is taken as the research object,and the extrusion process of TA15 titanium alloy is numerically simulated by using finite element software.By adjusting the chamfer size,core position and included angle,the extrusion die structure is optimized,and the qualified V profile with good straightness and no bending and torsion is obtained.The simulation results show that the larger the chamfer size is,the faster the cross-section metal flow speed is,the influence law of the center position is closer to the mold center,and the faster the metal flow speed is.The influence law of the included angle is to describe the relative position of the die hole on the mold.The included angle greatly affects the cross-section metal flow speed of the extruded profile.When the chamfer size,center position and included angle are selected reasonably,a better extrusion die can be designed to obtain profiles without bending and twisting.