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Study on surface integrity of titanium alloy machined by electrical discharge-assisted milling
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-08-18 , DOI: 10.1016/j.jmatprotec.2021.117334
Moran Xu 1, 2 , Changping Li 2 , Rendi Kurniawan 1 , GunChul Park 1 , Jielin Chen 1 , Tae Jo Ko 1, 2
Affiliation  

Electrical discharge-assisted milling (EDAM) is an efficient machining process for titanium alloys according to previous studies. However, a complete understanding of the surface integrity of titanium alloy machined with EDAM is not yet sufficient. Therefore, in this paper, surface defects such as chip layer adhesion, debris, feed marks, and burrs were investigated and identified. Among them, the adhesion of the chip layer is the most common surface defect and is the factor that has the greatest influence on the surface quality. In addition, surface roughness, micro-hardness, and residual stress were analyzed and discussed. The results show that the surface roughness of EDAM is significantly improved compared to conventional milling (CM). Also, the residual stress generated by EDAM is much smaller than that of CM, and the main type of residual stress is residual compressive stress. Similarly, the surface microhardness after EDAM is also slightly smaller than that of CM. This increased surface integrity is due to the material softening effect due to the heat generated by the discharge spark. Consequently, EDAM is a good candidate method for efficient machining of titanium alloys.



中文翻译:

放电辅助铣削加工钛合金表面完整性研究

根据先前的研究,放电辅助铣削 (EDAM) 是一种有效的钛合金加工工艺。然而,对用 EDAM 加工的钛合金表面完整性的完整了解还不够。因此,在本文中,对芯片层粘附、碎屑、进给痕迹和毛刺等表面缺陷进行了调查和识别。其中,芯片层的附着力是最常见的表面缺陷,是对表面质量影响最大的因素。此外,还对表面粗糙度、显微硬度和残余应力进行了分析和讨论。结果表明,与常规铣削(CM)相比,EDAM 的表面粗糙度得到显着改善。此外,EDAM 产生的残余应力远小于 CM,残余应力的主要类型是残余压应力。同样,EDAM 后的表面显微硬度也略小于 CM。这种增加的表面完整性是由于放电火花产生的热量引起的材料软化效应。因此,EDAM 是一种有效加工钛合金的良好候选方法。

更新日期:2021-08-21
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