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本文主要根据作者在液体介质小间隙脉冲放电的试验中,就间隙放电电压和放电电流的形态,提出了在一次脉冲放电期间,存在着微短路与微电弧现象。在一次脉冲放电期间内,微短路与微电弧存在的时间,即占整个脉冲时间的比率,对研究放电过程与腐蚀过程是有益的,同时对实际的放电加工过程实行监控也是有意义的。通常,脉冲放电过程中存在极短时间的微短路与微电弧现象,对加工的稳定性影响不大,但是微短路与微电弧时间较长时,将有可能转变成长时间短路和拉弧,这将会影响加工的正常进行。电火花加工的脉冲放电过程总是处于极其复杂的剧烈变化之中,如果能把间隙的放电过程控制在相对稳定的最佳状态之下,将有利于加工的顺利进行。通常,在两极间施加脉冲电压后,会在间隙出现空载、加工、短路、拉弧等几种典型状态。然而,在实际的放电加工中,一次脉冲放电期间内,这几种状态往往是混杂出现的。这也是液体介质小间隙脉冲放电过程的重要特征之一。掌握了它的规律性,对于研究电火花加工放电过程和腐蚀过程是相当有益的,同时对间隙状态的监控和强化加工工艺过程也是有实际意义的。本文主要讨论在单脉冲放电期间内发生的微短路和微电弧现象。
In this paper, mainly based on the author’s experiments on small gap impulse discharge in liquid medium, the phenomenon of micro-short circuit and micro-arc during a single impulse discharge is proposed in terms of the form of gap discharge voltage and discharge current. During a pulse discharge, the existence of micro-short circuit and micro-arc time, that is, the ratio of the entire pulse time, is conducive to the study of discharge process and corrosion process, while monitoring the actual discharge process is also meaningful. In general, there is a very short time of micro-short circuit and micro-arc phenomenon in the pulse discharge process, which has little effect on the stability of the process. However, when the micro-short circuit and the micro-arc time are long, it may turn into long-time short circuit and arcing Will affect the normal processing. EDM pulse discharge process is always in the extremely complex and dramatic changes in the discharge process if the gap can be controlled in a relatively stable under the best condition, will be conducive to the smooth progress of the processing. Normally, after the pulse voltage is applied between two poles, there will be several typical states such as no-load, machining, short-circuiting and arcing in the gap. However, in the actual discharge machining, during a pulse discharge, these states are often mixed occurrence. This is also one of the important features of the small gap impulse discharge process in liquid media. Mastered its regularity, it is quite beneficial for researching discharge process and corrosion process of EDM, meanwhile it is of practical significance to supervise and strengthen the machining process of gap state. This article focuses on micro-shorts and micro-arcs that occur during a single-pulse discharge.