TC18钛合金热锻成形摩擦系数的实验研究

Research on Friction Coefficient in Hot Forging Process of TC18 Titanium Alloy

在TC18钛合金热锻成形过程中,摩擦系数对锻件成品率和模具服役寿命有显著影响。为了精确测定不同工艺条件下的摩擦系数,基于工艺实验结合Deform-3D有限元分析的方法,通过建立摩擦系数标定曲线,测定了TC18钛合金圆环在不同润滑条件下镦粗过程中的摩擦系数,对温度场、应变场及金属流动状态进行了分析。结果表明,在TC18钛合金热锻成形工艺过程中,干摩擦条件下的摩擦系数最大,为0.70~0.80;复合润滑布条件下的摩擦系数最小,为0.30~0.40;在保温棉+纤维布的润滑条件下,摩擦系数为0.40;保温棉润滑条件下的摩擦系数为0.60~0.70。

In the hot forging process of TC18 titanium alloy,the friction coefficient has a significant effect on the qualified rate of forgings and the service life of dies.In order to accurately measure the friction coefficient under different technological conditions,based on the method of technological experiments combined with Deform-3D finite element analysis,the friction coefficient calibration curve was established,the friction coefficient during the upsetting process of TC18 titanium alloy ring under different lubrication conditions was measured,and the temperature field,strain field and metal flow were analyzed.The results show that in the hot forging process of TC18 titanium alloy,the friction coefficient under dry friction condition is the biggest,which is 0.70-0.80,the friction coefficient under composite cloth lubrication condition is the smallest,which is 0.30-0.40,the friction coefficient under insulation cotton+fiber cloth lubrication condition is 0.4,and the friction coefficient under insulation cotton lubrication condition is 0.60-0.70.