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Effects of Some Process Parameters on the Impulse Force in Single Pulsed EDM

机译：一些工艺参数对单脉冲电火花加工机冲击力的影响

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Electrical discharge machining (EDM) gets the advantage of less cutting force. However, a transient force named the impulse force exists in the machining process. The impulse force has effects on the efficiency, stability and accuracy of EDM. The peak current plays a major role in the impulse force, which has been studied and verified. However, the effects of other process parameters on the impulse force are lack of systematically study. Five single-factor experiments adopting different dielectric medium, polarity, gap width, tool geometry, and immersion depth, were designed and carried out. The single pulsed power source used in the experiments had constant discharge durations by detecting and shutting discharge current, which made the experiments to get rid of the randomness of discharge durations and be accurate. However, the vibration characteristics of the force sensor were changed by the dielectric medium, the fixture and the electrode weight, which made the measure of the impulse force to be complicated. The force balance method was simplified and adopted to acquire the maximum impulse force. It was found that these machining parameters had effects on the impulse force. There was little impulse force when the dielectric medium was air. The impulse force of positive polarity was a little higher than that of negative polarity. The impulse force of sphere tools was larger than that of needle tools. The increasing of gap width or immersion depth enlarged the impulse force. Moreover, the gap width had effects on the crater diameter while the depth of immersion did not. It is verified that these process parameters affected the impulse force by their effects on the bubble.
机译：放电加工（EDM）具有切削力较小的优点。但是，在加工过程中存在称为脉冲力的瞬时力。脉冲力会影响电火花加工的效率，稳定性和准确性。峰值电流在脉冲力中起着主要作用，已进行了研究和验证。但是，其他过程参数对冲击力的影响尚缺乏系统的研究。设计并进行了五个采用不同介质，极性，间隙宽度，工具几何形状和浸入深度的单因素实验。实验中使用的单脉冲电源通过检测和关闭放电电流来保持恒定的放电持续时间，这使该实验摆脱了放电持续时间的随机性，并获得了准确的结果。然而，力传感器的振动特性由于电介质，固定装置和电极重量而改变，这使得对冲力的测量变得复杂。简化了力平衡方法，并采用它来获得最大的脉冲力。发现这些加工参数对脉冲力有影响。当电介质为空气时，几乎没有脉冲力。正极性的脉冲力略高于负极性。球形工具的脉冲力大于针头工具的脉冲力。间隙宽度或浸入深度的增加扩大了脉冲力。此外，间隙宽度对弹坑直径有影响，而浸入深度则没有。证实这些工艺参数通过其对气泡的影响影响了脉冲力。

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