慢走丝电火花线切割TC4试验研究和参数优化

以慢走丝电火花线切割加工钛合金TC4为试验对象,在正交试验的基础上,通过信噪比(signal to noise ratio,SNR)方法研究峰值电流、开路电压、脉冲宽度、走丝速度和丝张力对加工时间、切缝宽度和表面粗糙度的影响规律.采用灰色关联度分析方法将多目标参数优化转化为单目标灰关联度的优化,得到慢走丝电火花线切割TC4在多项工艺指标要求下的最优参数组合.多目标优化结果表明:在峰值电流为30 A,开路电压为100 V,脉冲宽度为20μs,走丝速度为105 mm/s,丝张力为12 N时,表面粗糙度减小了8.35%,切缝宽度减少了2.59%,加工时间减小了26.06%.

Experimental Research and Parameter Optimization for Low Speed Wire Electrical Discharge Machining TC4

LS-WEDM (low speed wire electrical discharge machining) TC4 was regarded as the research object， the influence of peak current， open circuit voltage， pulse width， wire speed and wire tension’s effects on process time， kerf width and surface roughness was studied by SNR (signal to noise ratio) method. The gray correlation analysis was applied to realize the transformation from multi-objective parameter optimization to signal objective optimization of grey correlation degree and the optimum machining parameter combination of LS-WEDM were obtained under the multiple technical index requirements. Multi-objective parameter optimization results show that when the peak current is 30A， the open circuit voltage is 100V， the pulse width is 20μs， the wire speed is 105mm/s and wire tension is 12N， the surface roughness， kerf width and process time were reduced by 8.35%， 2.59% and 26.06%， respectively.