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1、 二 一二年三月 Nanjing University of Aeronautics and Astronautics The Graduate School College of Mechanical and Electrical Engineering Research on Conductive Engineering Ceramics Electrochemical Discharge Perforation Technology Based on the Combination of the Positive and Negative Pulse Power A Thesis in
2、Mechanical Engineering by Zhang You Advised by Prof. Huang Yinhui Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Engineering Mar., 2012 承诺书 本人声明所呈交的硕士学位论文是本人在导师指导下进行的研究工作及取得的研究成果。除了文中特别加以标注和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得南京航空航天大学或其他教育机构的学位或证书而使用过的材料。 本人授权南京航空航
3、天大学可以将学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。 （保密的学位论文在解密后适用本承诺书） 作者签名： 日 期： 南京航空航天大学硕士学位论文 I 摘摘 要要 工程陶瓷因其具有强度大、硬度高、耐磨和耐腐蚀等特殊性能，在高新技术中越来越受科研工作者的关注，但其加工比金属加工困难得多，许多优良特性得不到有效的利用，因此需要开发高效、精密的陶瓷加工新工艺新技术。近二十年来，科研工作者探索了非导电工程陶瓷的电火花加工、激光加工、超声波加工等加工工艺，但都存在加工效率低的问题。为此，本文在吸收国内外学者研究成果的基础上，提出了基于正负组合脉
4、冲电源的非导电工程陶瓷电化学放电穿孔技术，主要研究内容如下： （1）以普通电化学放电为基础，分析了正负组合脉冲电源电化学放电加工原理、材料蚀除物理过程和加工能量分配。从提高能量利用率的角度出发，该原理使本来用于电解气体浪费的能量存储起来，在放电瞬间以爆炸燃烧的形式重新利用起来，与常规电化学放电加工相比可大大的地提高材料蚀除效率；最后，从宏观上分析了电化学放电过程。 （2）以金属材料放电加工模型为基础，建立了非导电工程陶瓷电化学放电加工模型。试验研究了电化学放电伏安特性，将电化学放电伏安曲线分为四个阶段：线性区、上升区、下降区和稳定区，验证了电化学放电加工模型。 （3） 设计了绝缘涂层构件的电化
5、学放电穿孔试验装置， 分析了其加工原理和三种加工状态，提出了相应的加工策略。通过试验研究了电参数与穿孔直径的关系，并加工了直径为1.400mm的通孔。 （4）通过试验证明了正负组合脉冲电源电化学放电加工技术的高效性，研究了电压、脉冲宽度、占空比、电极转速和工作液浓度等与氧化锆陶瓷材料去除率关系。 关键词关键词：非导电工程陶瓷，正负组合脉冲电源，电化学放电，穿孔加工 基于正负组合脉冲电源的非导电工程陶瓷电化学放电穿孔技术研究 II ABSTRACT Engineering ceramics are gotten more and more attention by researchers in
6、the advanced science and technology, because of its special performance, such as strength, high hardness, wear resistance and corrosion-resistant. However, its many fine features can not be effectively utilized as the processing is much more difficult than metal, so need to develop efficient, precis
7、ion ceramic processing and new technology. In the past two decades, researchers explored many processing, such as EDM, laser machining and ultrasonic machining, in machining the non-conducting engineering ceramics, but the problem of them is low processing efficiency. In this paper, on the basis of
8、absorbing the research results of domestic and foreign scholars, the author innovatively propose the research of conductive engineering ceramics ECDM perforation technology based on the combination of the positive and negative. The main contents as follow: (1) On the basis of ordinary ECDM, it analy
9、sis the principle of ECDM based on the combination of positive and negative pulse power, the physical process of material corrosion and the distribution of processing power. From the perspective of improving the energy efficiency, this theory that have been a waste of energy for the electrolysis of
10、gas stored in the discharge burning in the form of an explosive instant re-use them. It can greatly improve material removal rate compared with the conventional ECDM. Last, from the macro the ECDM process has been analyzed. (2) Based on the model of metal materials EDM, it established a non-conducti
11、ve ceramic ECDM engineering model. In order to verify ECDM model, it has studied electrochemical discharge voltage characteristics, which is divided into four stages: the linear region, the up region, the fall region and the stable region. (3) Based on insulation coating component, it has designed t
12、he test equipment of ECDM hole, whose machining principle and three processing states have been analyzed. It also made specific processing strategies. Research by the electrical parameters and the relationship between the holes diameter, and as the basis for processing a hole whose diameter is 1.400
13、mm. (4) The high efficiency of ECDM technology based on combination of positive and negative pulse power is proved by experiment. Various parameters on the zirconia ceramic material removal rate are also researched. Keywords: Non-conducting engineering ceramics, Combination of positive and negative pulse power, ECDM, Perforation processing 南京航空航天大学硕士学位论文 III 目 录 第一章 绪论 . 1 1.1 非导电工程陶瓷的性质和应用 . 1 1.2 非导电工程陶瓷加工现状 . 2 1.2.1 机械加工 . 2 1.2.2 激光加工 . 3 1.2.3 水射流加工 . 4 1.2.4 超声加工 .
