超大厚度电火花线切割理论研究

【摘要】 从电火花加工原理出发，用流体力学方法分析切缝中工作液状况，得出切缝中工作液状况与切缝宽度、切缝长度、电极丝的丝速以及工作液的粘度和工作液成分的关系。当工件厚度大于200mn。，电极丝运动产生的剪切流动是工作液在切缝中流动的主要因素。从上述分析出发，通过增加脉冲峰值电流的手段增加切缝的宽度，改善了切缝中工作液的状态，提高加工稳定性，实现对805mm厚的钢质工件进行加工。更多还原

【Abstract】 Through analysis we can conclude that the twist flow caused by the movingof wore is the major factor to affect the flow of working liquid while that caused by thediffererce of press can be neglected. The liquid from a pump only provide the working liquidfor the twist flow. The idea that the metal particles can affect the stability of WEDM givesus a new way to control the stability during processing ultra--thick workpieces. Afterincreasing the maximum value of electric flow, changing the ingredient of working liquid,improving the stability of processing, 805mm--thick steel workpiece has been processedsuccessfully, thus the processing scope is greatly widened.更多还原