气体及水雾中电火花线切割薄板实验及仿真研究

发布时间：2018-05-18 18:15

本文选题：水雾中电火花线切割加工 + 薄板粗加工　；参考：《哈尔滨理工大学》2017年硕士论文

【摘要】：电火花线切割以其应用的广泛在各个工业制造领域中起了重要的作用,尤其在现在科技发展迅速的时代,电火花线切割技术已经应用在模具加工行业、汽车制造行业以及航空航天行业的各个领域。它适用于复杂零件的精密加工,特殊刀具加工制造,各类难加工材料。水雾中电火花线切割的优点很多,与液中加工相比放电间隙适中、加工的表面精度要比液中的高并且使用过程中清洁无任何有害物质;与气中加工相比,由于水雾有一定的绝缘性,在保护工件的基础上有减少了电极丝的损耗等优点。本文对电火花加工机理进行了简要的概述,综合分析了国内外粗加工、精加工的研究状况,并对电火花仿真方面的研究进行了概述。对气中单脉冲电火花热分析进行了仿真模拟,在温度场分析的基础上,得出电蚀坑理论模型。在分析模型时考虑到了电蚀坑的重要因素,包括白层的厚度以及边缘凸起所对电蚀坑蚀除体积的影响,通过均匀放置电蚀坑的方法以及理论上电蚀坑总数的计算预测出电蚀坑的叠加状态。最终建立了电火花线切割的理论蚀除体积计算方法,并通过实验进行对理论蚀除体积进行检测,验证了模型的准确性以及蚀除体积计算方法的可靠性。这对于薄板粗加工预测蚀除体积量有着很重要的意义。在高速走丝机床中研究水雾电火花粗切割薄板,进行了大气、水雾、乳化液介质的对比试验,并且得到了不同的介质对线切割工艺指标的影响。针对于水雾中进行了单因素的试验,以脉冲间隔比、峰值电流、工作台进给速度、脉冲宽度、薄板的厚度分别进行了单因素试验,通过对实验结果的分析,得出了适合于薄板粗加工的参数常用范围,以及基本参数对薄板厚度加工的影响。对水雾粗加工的实用参数总结了一套规律,大大提高了加工效率,并通过正交试验对参数进行优选得出对工艺指标影响的最优值。
[Abstract]:WEDM has played an important role in various industrial manufacturing fields because of its wide application. Especially in the era of rapid development of science and technology, WEDM technology has been applied in die processing industry. Automotive industry and aerospace industry in all areas. It is suitable for precision machining of complex parts, machining and manufacturing of special cutting tools, and all kinds of hard-machined materials. WEDM in water mist has many advantages, such as moderate discharge gap compared with liquid machining, higher surface precision than that in liquid, and no harmful substances in use. Because water mist has certain insulation, it can reduce the loss of electrode wire on the basis of protecting workpiece. In this paper, the mechanism of EDM is briefly summarized, the research status of rough machining and finishing machining at home and abroad is analyzed, and the research on EDM simulation is summarized. The thermal analysis of single pulse EDM in gas is simulated. Based on the analysis of temperature field, the theoretical model of electric etching pit is obtained. In the analysis of the model, the important factors of the electroetching pit are taken into account, including the thickness of the white layer and the effect of the edge protruding on the etching volume of the etch pit. The superposition state of the electric etch pits is predicted by the method of placing the electric pits uniformly and the calculation of the total number of the electric etched pits in theory. Finally, the theoretical etching volume calculation method of WEDM is established, and the theoretical etching volume is tested by experiments, which verifies the accuracy of the model and the reliability of the calculation method. This is of great significance to predict the volume of erosion in rough machining of thin plate. In this paper, the water mist EDM rough cutting thin plate is studied in high speed wire-moving machine. The contrast tests of atmosphere, water mist and emulsion medium are carried out, and the influence of different media on the WEDM process index is obtained. A single factor test was carried out in the water mist. The single factor tests were carried out in terms of pulse interval ratio, peak current, feed speed of the worktable, pulse width and thickness of the thin plate. The results of the experiment were analyzed. The common range of parameters suitable for thin plate roughing and the influence of basic parameters on thin plate thickness machining are obtained. A set of rules is summarized for the practical parameters of water mist rough machining, and the processing efficiency is greatly improved, and the optimum value of the influence on the process index is obtained by the optimum selection of the parameters through the orthogonal test.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG484

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