侧铣式高速电弧放电加工的极间流场仿真及加工试验

发布时间：2018-04-15 15:30

本文选题：侧铣式高速电弧放电加工 + 冲液孔分布　；参考：《机械工程学报》2015年09期

【摘要】：在高速电弧放电加工方法的基础上提出一种用于加工连续曲面、直纹面等的新型加工工艺——侧铣式高速电弧放电加工方法。与其他利用电弧进行加工的工艺方法相比,侧铣式高速电弧放电加工主要利用电极的侧面进行电弧蚀除加工,可用于加工各种复杂曲面和曲率半径较大的型腔及沟槽、流道等。侧铣电极采用侧面周边及底面多孔结构,能够实现极间的强化内冲液,在电极旋转运动的配合下,可有效控制电弧进而达到高效去除材料的目的。为了深入研究流场对侧铣式高速电弧放电加工效果的影响,建立了加工过程的极间流场模型,仿真并分析了侧铣电极在不同冲液孔分布及冲液入口压力下的极间流场。分析及进一步的工艺试验结果皆表明,在冲液入口压力为1.6 MPa时,在保证电极结构强度的条件下,增加电极的周向孔数,可以实现极间工作液的充分流动,使流场分布更均匀,从而改善电弧放电状态,可以获得较好加工效果。试验表明,在峰值电流400 A时,侧铣式高速电弧放电加工Cr12模具钢的材料去除率可以达到4 095 mm~3/min,相对电极损耗率为2.5%。最后,采用侧铣式高速电弧放电加工方法进行了连续曲面及涡轮叶片特征流道加工的可行性验证。
[Abstract]:On the basis of high speed arc discharge machining method, a new type of machining technology, side milling high speed arc discharge machining method, is proposed for machining continuous surface and straight surface.Compared with other arc machining methods, the side milling high speed arc discharge machining mainly uses the side of the electrode for arc erosion processing. It can be used to process all kinds of complex curved surfaces and large curvature radius cavity and grooves, flow channels and so on.The side milling electrode adopts the porous structure of the side periphery and the bottom surface, which can realize the enhanced internal flush between the poles. With the coordination of the rotating electrode motion, the arc can be effectively controlled and the material can be removed efficiently.In order to deeply study the effect of flow field on the effect of side milling high speed arc discharge machining, a model of interpolar flow field in the machining process was established. The flow field between electrodes was simulated and analyzed under different punching hole distribution and inlet pressure.The results of analysis and further technological tests show that when the inlet pressure is 1. 6 MPa and the electrode structure strength is guaranteed, the sufficient flow of the working fluid between the electrodes can be realized by increasing the number of circumferential holes of the electrode, and the flow field can be more evenly distributed.Thus, better machining effect can be obtained by improving the arc discharge state.The results show that the material removal rate of Cr12 die steel can reach 4 095 mm / min at peak current 400A, and the relative electrode loss rate is 2. 5%.Finally, the feasibility of machining continuous curved surface and turbine blade characteristic runner is verified by side milling high speed arc discharge machining method.
【作者单位】：上海交通大学机械系统与振动国家重点实验室;上海交通大学机械与动力工程学院;
【基金】：国家自然科学基金重点资助项目(51235007)
【分类号】：TG661

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