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从有限元的角度出发,采用顺序耦合法对TC4钛合金的单脉冲电火花表面强化过程进行数值仿真,探讨其强化过程中温度场和热应力场情况。通过对比钛合金表面强化实验,验证了数值仿真在电火花强化过程中应用可行性。结果表明:在仅考虑热应力影响的条件下,工件上最大应力值随时间的推移由热源中心向四周移动,且应力值不断增大,最终最大应力值形成环状带,并向两侧逐渐减小;热裂纹由热源中心萌生并沿径向扩展,裂纹开裂程度(裂缝)逐渐扩大,在最大应力区域达到最大,与有限元模拟结果相符。
From the perspective of finite element method, the sequential coupling method is used to simulate the single-pulse EDM surface strengthening process of TC4 titanium alloy, and the temperature field and thermal stress field in the process of strengthening are discussed. By comparing the titanium alloy surface strengthening experiments, the feasibility of numerical simulation in the EDM process is verified. The results show that under the condition of considering thermal stress only, the maximum stress value of the workpiece moves from the center of the heat source to the surrounding area with the passage of time, and the stress value increases continuously. The final maximum stress value forms an annular zone and gradually increases to both sides Decreases. The thermal cracks are initiated by the center of the heat source and propagate in the radial direction. The degree of cracking (crack) gradually increases and reaches the maximum in the maximum stress region, which agrees with the result of finite element simulation.