轴承退的磁机磁场衰减比与退磁效果关系的实验和分析.doc

轴承退磁机磁场衰减比与退磁效果关系的试验与分析 摘 要 先进的退磁理论和退磁技术是轴承行业适应国民经济发展趋势的必然要求。对轴承退磁时，退磁磁场衰减比对退磁效果的影响很大。本课题从退磁理论和生产实际两个方面分析和说明了磁场衰减比与退磁效果的关系。 本论文主要从以下四个方面说明课题的研究方向和内容： ①从轴承零件的特点、剩磁来源和铁磁质的物理特性出发，简要分析各种轴承退磁方法的原理及其优缺点。 ②通过分析动态磁滞回线说明轴承零件交流退磁时的磁场衰减规律与退磁效果的关系。 ③比较常用退磁电路和退磁方法，设计实验寻求退磁效果最好的磁场衰减比。 ④分析实验过程和实验数据，找出实验中可能干扰实验结果的因素，在此基础上总结出磁场衰减比与退磁效果的关系并提出这种关系产生的原因。 实验得出的主要结论有：直流换向退磁与工频交流退磁相比，具有电能损耗低、退磁效果好的优势。但其退磁过程不易保持一致，且磁场衰减比越小，退磁磁场衰减次数越多，退磁稳定性越差。因此在直流换向退磁中，遵循退磁规律选择退磁磁场参数选择尤为重要。当退磁磁场衰减比设置在1.35~1.5之间时退磁效果最好。 关 键 词：OF ATTENUATION COEFFICIENT AND DEMAGNETIZATION EFFECT IN BEARING DEMAGNETIZATION MACHINE ABSTRACT It is necessary to develop advanced demagnetization theory and technology, only in this way can bearing industry adapt to national economic development requirement. The attenuation coefficient influences greatly on demagnetization effectiveness. So this topic analyzed the relationship of attenuation coefficient and demagnetization effectiveness from not only demagnetization theory but also technology. This paper shows the direction and the content of the research from the following four aspects: ① On the basis of knowledge about the characteristics of bearing parts, remanence sources and the physical characteristics of ferromagnetic materials, this paper briefly describes the principle of various bearing degaussing methods along with their advantages and disadvantages. ② By analyzing the dynamic magnetic hysteresis, this paper also explains how the AC demagnetization law demagnetization effectiveness. ③ Contrasting the feasibility of the commonly used demagnetization circuits and methods to design relatively experiment, which on the purpose of seeking the best attenuation coefficient. ④ Searching the factors which may disturb the experimental results in the experiment in the way of analyzing experiment process and the empirical datum. Further more, taking the analysis as a foundation, the paper will summarize the relationship of attenuation coefficient and demagnetization effectiveness as