线切割液中走丝线切割加工中，工作液是脉冲放电的介质，对加工的影响很大。工作液一般要求有一定的绝缘性能、较好的洗涤性能、较好的冷却性能和对环境无污染，对人体无危害。工作液的配置也相当重要，太浓、太淡时，均会引起断丝，—般水液浓度比均在1：10—1：20范围内。中走丝切割速度要求高或大厚度工件切割时，浓度适当低些，这样加工比较稳定，且不易断丝。

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中走丝线切割加工中，为了高效地加工出符合要求的工件，对操作人员也有一定的要求。

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