基于正交实验的TC4钛合金连杆锻造工艺参数多目标优化

In order to realize the green design of connecting rod hot forging process, based on Deform-3D platform, the method of orthogonal experiment and numerical simulation was used to optimize the TC4 titanium alloy connecting rod in hot forging process. Four process parameters, including initial forging temperature, forging speed, flattening amount and friction factor, were taken as factors affecting the performance of connecting rod. The influence rules of four evaluation indexes, including energy consumption, maximum forming load, deformation uniformity and maximum equivalent stress, were investigated. The optimal process plan of TC4 titanium alloy connecting rod was obtained by means of comprehensive frequency analysis. The quality and energy consumption of connecting rod before and after optimization were compared and analyzed. It is found that compared with the other three process parameters, the initial temperature of forging blank has the greatest influence on the energy consumption and quality of connecting rod hot forging. After optimization, the unit volume energy consumption decreased from 658.37J/mm3 to 417.16J/mm3, a decrease of 31.15%. The forming load decreased by 20.18% from 6560.36kN to 5236.42kN; The equivalent stress decreased by 2.73% from 226MPa to 220MPa, and the deformation uniformity decreased by 10.52% from 0.656 to 0.587. The metal filling of TC4 titanium alloy connecting rod is normal and there are no forging defects, so green manufacturing is realized.