Design and experimental study of a multi-mode controllable RC pulse generator for micro-EDM
Design and experimental study of a multi-mode controllable RC pulse generator for micro-EDM
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DOI：
10.1049/cp.2010.1310
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Hu;Yong Li;H. Tong
中科院分区：
文献类型：
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作者：
M. Hu;Yong Li;H. Tong
采用最先进的电子技术，研制了一种多模可控RC脉冲发生器。该电路既可以工作在脉冲串模式下，也可以工作在等脉冲模式下，可以实现100 ns的开路脉冲导通。通过钻微孔和盲孔，研究了电容和脉冲参数对加工过程的影响。对于脉冲串模式和等脉冲模式，电容的存在将导致更陡峭的上升沿、更高的密度和更小的振荡，从而导致更有效的每脉冲金属去除速率。在脉冲串模式下，当电容小于某一值时，随着电容的增大，加工时间缩短，电极与通孔之间的侧向放电间隙基本不变。采用可控RC电路，电容值可达15000pF。而且在电容的存在下，放电还可以在脉冲关闭时间内去除金属，从而获得较高的放电频率和加工速度。在等脉冲模式下，放电能量更一致，表面粗糙度更好。
A multi-mode controllable RC pulse generator is developed with the state-of-art electronic technique. The circuit can work at both pulse-train and isopulse mode, and a 100ns open-circuit pulse on-time can be achieved. By drilling micro via and blind holes, the influences of capacitance and pulse parameters to the process are studied. For both pulse-train and isopulse mode, the existence of the capacitance will lead to a sharper rising edge, high density and less vibrating of the discharge current, which results in a more effective metal removal rate per pulse. With the pulse-train mode, when the capacitance is smaller than a certain value, with the increase of it, the machine time decreases and the side discharge gap between electrode and via hole is almost unchanged. The value of certain capacitance is 15000pF with the controllable RC circuit. And with the existence of the capacitance, the discharge can also remove metal during pulse-off time, and a high discharge frequency and machining speed can be achieved. With isopulse mode, the discharge energy is more consistent, and better surface roughness can be achieved.