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高速钢EN HS6-5-2C精密电火花加工表面完整性评估。

Assessment of Surface Integrity in Precision Electrical Discharge Machining of HSS EN HS6-5-2C.

作者信息

Straka Ľuboslav, Piteľ Ján, Čorný Ivan

机构信息

Department of Automobile and Manufacturing Technologies, Faculty of Manufacturing Technologies with the Seat in Presov, Technical University of Kosice, Sturova 31, 080 01 Presov, Slovakia.

Department of Industrial Engineering and Informatics, Faculty of Manufacturing Technologies with the Seat in Presov, Technical University of Kosice, Bayerova 1, 080 01 Presov, Slovakia.

出版信息

Micromachines (Basel). 2024 Dec 1;15(12):1469. doi: 10.3390/mi15121469.

DOI:10.3390/mi15121469
PMID:39770222
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11679723/
Abstract

The integrity of the machined surface in precision wire electrical discharge machining (WEDM) of electrically conductive materials is one of the most important quality indicators. The integrity parameters of the machined surface are primarily monitored in terms of micro and macro geometry parameters. This paper presents the results obtained as a part of experimental research aimed at evaluating surface crack density (SCD) when machining EN HS6-5-2C using WEDM technology. The aim was to find a combination of main technological parameters (MTP) in order to minimize the qualitative indicators SCD and Ra of the eroded surface. The results of experimental research within the framework of the evaluation of SCD and Ra indicators were processed using the Taguchi method. The integrity of the eroded surface was examined by scanning digital microscope (SDM) after application of full and multiple offset cuts with an AC Brass LP 1000 brass wire electrode. Based on the experimental measurements performed, significant facts were discovered. It was found that the largest surface integrity defects are present after the application of full cuts and the first two offset cuts. At the same time, it was found that lower values of the SCD parameter in WEDM of EN HS6-5-2C steel were recorded at thicknesses above 130.0 mm. The SCD parameter was also confronted with the Ra parameter, and it was found that they are significantly influenced by MTP. The higher value of the peak current (19 A) and the longer duration of the discharge (32 μs) result in an increase in the value of the SCD parameter from 0.005 μm·μm to 0.0256 μm·μm. The resulting solutions are mathematical regression models (MRM), which allow the prediction of both monitored qualitative indicators with respect to their minimization.

摘要

在导电材料的精密电火花线切割加工（WEDM）中，加工表面的完整性是最重要的质量指标之一。加工表面的完整性参数主要根据微观和宏观几何参数进行监测。本文介绍了作为实验研究一部分所获得的结果，该实验研究旨在评估使用WEDM技术加工EN HS6-5-2C时的表面裂纹密度（SCD）。目的是找到主要工艺参数（MTP）的组合，以最小化被腐蚀表面的质量指标SCD和Ra。使用田口方法对SCD和Ra指标评估框架内的实验研究结果进行了处理。在用AC Brass LP 1000黄铜丝电极进行全切割和多次偏移切割后，通过扫描数字显微镜（SDM）检查被腐蚀表面的完整性。基于所进行的实验测量，发现了重要事实。发现在进行全切割和前两次偏移切割后，存在最大的表面完整性缺陷。同时，发现在EN HS6-5-2C钢的WEDM中，当厚度超过130.0 mm时，记录到较低的SCD参数值。还将SCD参数与Ra参数进行了对比，发现它们受到MTP的显著影响。较高的峰值电流（19 A）和较长的放电持续时间（32 μs）导致SCD参数值从0.005μm·μm增加到0.0256μm·μm。所得解决方案是数学回归模型（MRM），它允许对两个监测的质量指标进行最小化预测。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/63b2/11679723/36ae8d4c299f/micromachines-15-01469-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/63b2/11679723/8d5b96d1a13b/micromachines-15-01469-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/63b2/11679723/0a166b76607d/micromachines-15-01469-g018.jpg
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