Evin Emil, Tomáš Miroslav, Kmec Jozef
Department of Automotive Production, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01 Košice, Slovakia.
Department of Physics, Mathematics and Technics, Faculty of Humanities and Natural Sciences, Presov University, Ul. 17 novembra 1, 081 16 Prešov, Slovakia.
Materials (Basel). 2020 Mar 9;13(5):1223. doi: 10.3390/ma13051223.
Exterior car-body parts are made of steel or aluminum sheets. Their formability and appearance after painting depends not only on the mechanical properties but also on their surface texture. The surface roughness characteristics, the roughness average and the peak count per centimeter depend on the texture of rolling mill's finishing rollers, their wear and the degree of removal by the rolling mill. The research was carried out on heat-treated finishing rollers on the surface of which a controlled texture was created by changing the electro-discharge texturing (EDT) parameters. Parameters and the number of electro-discharge texturing experiments were optimized using full four-factor experiment techniques at the upper and lower levels of the parameters in the form of 2. The significance of the impact of individual EDT parameters and their interactions was identified based on the variance results. The ANOVA variance analysis results confirmed that the roughness and the peak count depend primarily on peak current (), discharge peak voltage (), pulse on time () and pulse off time (). Optimization of the effect of the above parameters on the target roughness values and the peak count of finishing rollers was performed by the response surface methodology (RSM). Obtained regression models describe relationships between the input parameters of the electro-discharge texturing of finishing rollers and the output characteristics of the and the texture to a very high degree. The reliability of the electro-discharge texturing process of working rollers was assessed using the process capability index .
汽车车身外部部件由钢板或铝板制成。它们的可成形性和涂装后的外观不仅取决于机械性能，还取决于其表面纹理。表面粗糙度特性、平均粗糙度和每厘米的峰值数取决于轧机精整辊的纹理、磨损情况以及轧机的去除程度。该研究是在经过热处理的精整辊上进行的，通过改变电火花纹理加工（EDT）参数在其表面形成可控纹理。采用全四因素实验技术，在参数的上下限以2的形式对电火花纹理加工实验的参数和数量进行了优化。基于方差结果确定了各个EDT参数及其相互作用影响的显著性。方差分析结果证实，粗糙度和峰值数主要取决于峰值电流（）、放电峰值电压（）、脉冲导通时间（）和脉冲关断时间（）。采用响应面方法（RSM）对上述参数对精整辊目标粗糙度值和峰值数的影响进行了优化。得到的回归模型高度描述了精整辊电火花纹理加工的输入参数与和纹理的输出特性之间的关系。使用过程能力指数评估了工作辊电火花纹理加工过程的可靠性。
