基于水基工作液高效电火花成型加工技术研究

发布时间：2018-06-06 07:29

本文选题：电火花成型加工 + 逆变式电源　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：电火花加工是早期的非传统加工方法之一。电火花加工能够加工任何导电的材料,而不用去考虑材料本身的机械性能,如硬度,强度,韧性以及脆性。电火花加工是在工件与电极间的小间隙中产生放电,并以熔化和汽化的方式将材料去除。电火花加工在加工复杂型腔以及高强高硬难加工导电材料方面发挥了重要作用。电火花加工技术广泛地应用于模具制造,航空领域、汽车制造以及医学领域。然而,电火花加工之后往往要进行抛光等后续处理工作,尤其是在模具加工等领域中,电火花加工后型腔表面难以直接满足使用要求。同时,传统电火花加工在加工效率方面存在着很大的局限性,且传统工作液采用煤油,其有易燃,易分解、易挥发等缺点。因此,开展高效水基工作液下的电火花成型加工技术研究有重要的实际应用价值及理论意义。基于逆变式脉冲电源原理设计了脉冲电源,脉冲电源能够提供最大电流为600A的任意大小及任意放电周期的大能量放电电流,基于脉冲电源,综合考虑多种因素,搭建了脉冲电源控制柜,使用基于VB语言所开发的成型机加工控制界面,通过接口技术控制电弧电源及成型机的工作。基于水基工作液配置了不同浓度的铝粉水基工作液,并通过添加不同乳化剂,研究不同乳化剂下铝粉水基工作液的稳定性,优选出了最佳的乳化剂。研制了混粉电火花成型加工实验装置,研究了电参数、非电参数对加工工艺过程中加工效率、工件表面粗糙度和工具电极损耗之间的关系,找出了相应的工艺影响规律关系。研制了单脉冲放电装置,借助示波器,金相显微镜和体视光学显微镜等对击穿机理,蚀除产物的形貌和加工后电极与工件的特性进行分析研究。试验加工出了轮胎模具花纹的样件。
[Abstract]:EDM is one of the early non-traditional machining methods. EDM can process any conductive material without considering its mechanical properties, such as hardness, strength, toughness, and brittleness. EDM produces discharge in the small gap between workpiece and electrode and removes the material by melting and vaporizing. EDM plays an important role in machining complex cavity and high-strength and hard-hard conductive materials. EDM technology is widely used in mold manufacturing, aviation, automobile manufacturing and medical field. However, after EDM, polishing and other follow-up work are often carried out, especially in the field of die machining, the surface of the cavity after EDM is difficult to meet the requirements of application. At the same time, the traditional EDM has great limitations in machining efficiency, and the traditional working fluid uses kerosene, which has the shortcomings of flammability, decomposition and volatilization. Therefore, it is of great practical and theoretical significance to study the EDM technology under high efficiency water-based working fluid. The pulse power supply is designed based on the principle of the inverter pulse power supply. The pulse power supply can provide a large energy discharge current of any size and any discharge period of the maximum current 600A. Based on the pulse power supply, a variety of factors are considered synthetically. The control cabinet of pulse power supply is built, and the working of arc power supply and molding machine is controlled by the interface technology, which is based on the machining control interface developed by VB language. Based on the different concentration of aluminum powder water base working liquid, the stability of aluminum powder water base working fluid under different emulsifiers was studied, and the best emulsifier was selected. An experimental device for powder mixing EDM was developed. The relationship between electrical parameters and non-electrical parameters on machining efficiency, workpiece surface roughness and tool electrode loss was studied. A monopulse discharge device was developed. The breakdown mechanism, the morphology of etching products and the characteristics of electrode and workpiece after machining were analyzed by means of oscilloscope, metallographic microscope and stereoscopic optical microscope. The sample of tire mould pattern was processed by experiment.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG661

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