PCD木工刀具电火花加工工艺参数优化

考察脉宽t_ON、峰值电流I_IP、脉冲间隙调整MA、脉冲间隙t_OFF对PDC加工精度和加工效率的影响。通过正交试验确定其最佳电加工工艺参数为:t_ON2 μs、I_IP10 A、MA1倍和t_OFF4 μs，其加工时间为458 s；加工后YG层的表面粗糙度R_a1为1.04 μm，PCD层的表面粗糙度R_a2为0.59 μm。在此基础上，通过单因素试验和分割试验进一步考察PIKADEN高压脉冲控制PP和高压辅助电源HP对电加工精度和效率的影响。结果发现:当PP设定为11、HP设定为013，即追加1.5 A高压辅助电流时，PDC的最佳电加工工艺参数为:t_ON4 μs、I_IP10 A、MA1倍和t_OFF4 μs，其加工时间最短，为130 s；加工精度较高，加工后YG层的R_a1为1.30 μm、PCD层的R_a2为0.56 μm。与正交试验确立的最佳工艺参数相比，其加工精度相差不大，但加工效率提高了3.5倍。 

Optimization of EDM process parameters for PCD woodworking tools

The effects of pulse width (t_ON), peak current (I_IP), pulse gap adjustment (MA) and pulse interval (t_OFF) on the processing accuracy and efficiency of PDC were investigated. The optimum EDM process parameters were determined by orthogonal experiments as follows: t_ON 2 μs, I_IP 10 A, MA 1 times, t_OFF 4 μs, processing time 458 s. The surface roughness R_a1 of YG layer was 1.04 μm and R_a2 of PCD layer was 0.59 μm. On this basis, the effects of PIKADEN high-voltage pulse control PP and high-voltage auxiliary power supply HP on the accuracy and efficiency of electrical machining were further investigated through single factor experiments and segmentation experiments. The results show that when PP is set to 11 and HP is set to 013, i.e. 1.5 A high voltage auxiliary current is added, the optimum EDM parameters of PDC are t_ON 4 μs, I_IP 10 A, MA 1 times and t_OFF 4 μs. The shortest processing time is 130 s with high processing accuracy, which is the YG layer R_a1 1.30 μm and the PCD layer R_a2 0.56 μm after processing. Compared with the optimum technological parameters determined by orthogonal experiments, the processing accuracy is not much different, but the processing efficiency is increased by 3.5 times.