【摘要】 基于特殊过程确认要求，采用渗铜石墨作为电极材料，通过三因素五水平正交试验(L₂₅（5³）)，以重铸层厚度、材料去除率、表面不平度及外观目视为评价指标，研究工艺参数峰值电流I_P、脉冲宽度T_on、脉冲间隙T_off对加工综合性能的影响。采用极差分析和方差分析揭示各参数的独立与耦合作用机制。结果表明：脉冲间隙T_off是加工稳定性的主导因素（F=9.39 ,P<0.01）；脉冲宽度T_on表现出显著的非线性效应，最优值为24μs，以实现熔化与抛出效率的平衡；峰值电流I_P需与T_on、T_off协同优化，增大电流（>14 A）会引起蚀除产物在间隙中过度累积，导致频繁短路和拉弧。所提出的面向高效率与高表面质量不同目标的参数优化策略，为耐热高温钛合金精密电火花加工的工程应用提供理论依据和数据支撑。更多还原

【Abstract】 Based on the requirements of special process confirmation,copper impregnated graphite was used as electrode material,and the effects of process parameters(I_p,T_on,T_off) on the comprehensive processing performance were systematically studied through three-factor five-level orthogonal experiment(L₂₅（5³）),taking the thickness of remelting layer,material removal rate,surface roughness and visual appearance as evaluation indexes. Using range analysis,analysis of variance and spark discharge mechanism,the independent and coupling mechanism of each parameter was revealed.The results show that the pulse gap T_offis the dominant factor of processing stability（F=9.39,P<0.01）;The pulse width ton shows a significant nonlinear effect,and the optimal value is 24 μs,in order to achieve the balance of melting and throwing efficiency;The peak current I_Pneeds to be optimized in coordination with T_onand T_off. Increasing the current（>14A） will cause excessive accumulation of etching products in the gap,resulting in frequent short circuit and arcing. A parameter optimization strategy for different objectives of high efficiency and high surface quality is proposed,which provides a clear theoretical basis and data support for the engineering application of precision EDM of heat-resistant and high-temperature titanium alloy.更多还原