电火花毛化表面电磁屏蔽效能影响因素分析
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摘要
主要针对电火花毛化表面电磁屏蔽效能的影响因素进行分析。为了研究在大电流、小脉宽条件下电火花加工毛化表面对提高材料表面吸波率的效果,得到较为理想的吸波毛化表面,在数控电火花成型加工机床上进行样件加工。通过积分球吸波试验台,利用其均分测量误差的特性,测量毛化表面电磁波的反射强度和对电火花毛化表面的吸波特性进行定性及定量的分析,并在扫描电镜和金相显微镜下结合表面形貌特征对试验数据的变化规律进行分析,研究脉冲宽度和峰值电流对吸波效果的影响。结果表明:毛化表面对电磁波的吸收情况受表面形貌的影响;在大电流、小脉宽条件下,吸波率随着脉冲宽度的增加呈现先增后减的趋势;吸波率随着峰值电流的增加总体上呈现增大的趋势。
The influence factors on electromagnetic shielding effectiveness of electric discharge texturing surface were mainly analyzed. In order to study the effect on the surface absorbance by EDM textured surface under big current, small pulse width condition, and to obtain ideally roughening surface to attract wave, the sample processing was carried on the NC electric spark formation processing tool. Using the characteristics of measuring error by equipartition, the reflection intensity of the surface electromagnetic wave was measured and the quantitative analysis of the microwave absorption characteristics of the electric spark texturing surface was carried out by means of the integrated ball suction test bed, and the changes of the experimental data were analyzed by using scanning electron microscope and metallographic microscope. The effects of the pulse width and the peak current on absorbing effect were studied. It is indicated the absorption to electromagnetic waves is affected by the surface morphology; under big current and small pulse width condition, the wave absorption rate increases first and then decreases with the increase of the pulse width; and it increases as the peak current is increased.
The influence factors on electromagnetic shielding effectiveness of electric discharge texturing surface were mainly analyzed. In order to study the effect on the surface absorbance by EDM textured surface under big current, small pulse width condition, and to obtain ideally roughening surface to attract wave, the sample processing was carried on the NC electric spark formation processing tool. Using the characteristics of measuring error by equipartition, the reflection intensity of the surface electromagnetic wave was measured and the quantitative analysis of the microwave absorption characteristics of the electric spark texturing surface was carried out by means of the integrated ball suction test bed, and the changes of the experimental data were analyzed by using scanning electron microscope and metallographic microscope. The effects of the pulse width and the peak current on absorbing effect were studied. It is indicated the absorption to electromagnetic waves is affected by the surface morphology; under big current and small pulse width condition, the wave absorption rate increases first and then decreases with the increase of the pulse width; and it increases as the peak current is increased.
引文
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[3] 徐小兵,毛利尚武.日本电火花加工技术的发展动态[J].电加工与模具,2003(1):1-3.
[4] 杨洋,徐俊杰,仇文亮,等.电参数对20Mn23AlV无磁钢毛化形貌影响的研究[J].热加工工艺,2016,45(22):82-84.YANG Y,XU J J,QIU W L,et al.Study on Influence of Electrical Parameters on Texturing Morphology of 20Mn23AlV Non-magnetic Steel[J].Hot Working Technology,2016,45(22):82-84.
[5] 曹凤国.电火花加工技术[M].北京:化学工业出版社,2005.
[6] 娄鹤翔.基于提高吸光率的无磁钢电火花毛化工艺研究[D].南昌:华东交通大学,2015.
[7] 黄金城.面向吸光效果提升的电火花毛化工艺研究[D].南昌:华东交通大学,2014.
[8] YADAV V,JAIN V K,DIXIT P M.Thermal Stresses Due to Electrical Discharge Machining[J].International Journal of Machine Tools and Manufacturing,2002,42:877-888.
[9] 李文娟.可见光成像系统成像质量评价指标的测量技术研究[D].哈尔滨:哈尔滨工业大学,2005.
[10] 刘颖辉.提高光电成像质量的方法研究[D].长春:长春理工大学,2009.