超声振动辅助电火花加工表面成形机理研究

Research on Surface Forming Mechanism of Ultrasonic Vibration Assisted EDM

以TC4钛合金作为工件材料,通过建立高斯热源在工件表面的分布模型,描述了单脉冲电火花加工凹坑的成形机理。为了验证模型的准确性,进行了仿真和实验验证。结果表明:通过分析仿真得到的温度场云图和实验测得的数据发现,高斯热源分布模型与两者一致。在引入超声振动后,表面粗糙度降低35%~46%,材料表面凹坑明显减少,表面形貌发生显著变化。随振幅增大,高斯热源分布曲线的最大值减小,温度场中心最高温度降低,深度变浅的表面凹坑数量增加,单个凹坑的面积增加,表面粗糙度变好。

TC4 titanium alloy was used as workpiece material,and the formation mechanism of single pulse EDM pits was described by establishing a Gaussian heat source distribution model on the surface of the workpiece.In order to verify the accuracy of the model,the simulation and experimental verification were carried out.The results show that by analyzing the temperature field cloud diagram obtained by simulation and the data measured by experiment,it is found that the Gaussian heat source distribution model is consistent with them.After the introduction of ultrasonic vibration,the surface roughness is reduced by about 35%to 46%,the pits on the surface of the material are significantly reduced,and the surface morphology changes significantly.As the amplitude increases,the maximum value of the Gaussian heat source distribution curve decreases.The maximum temperature in the center of the temperature field decreases.The number of shallower surface pits increases.The area of a single pit increases.The surface roughness becomes better.