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Assessment of the surface characteristics of aerospace grade AA6092/17.5 SiCp-T6 composite processed through EDM
CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2021-03-24 , DOI: 10.1016/j.cirpj.2021.03.005
Shirsendu Das , Uttam Acharya , S.V.V.N. Siva Rao , Swarup Paul , Barnik Saha Roy

The recently developed composite ‘AA6092/17.5 SiCp-T6’ is gradually capturing the attention of the defense and aviation sectors, where various fabrication and material processing are required to accomplish. Considering this emerging demand, it may require to generate a few integrated shapes or micro-slots on this material. Therefore, the responses and textural features of the surfaces are analyzed here to evaluate the suitability of EDM-operation for future processing. Experiments are executed for various flushing velocities and three different discharge conditions and noticed an excellent response in all aspects. The machining rate increases with flushing velocity for low and medium discharge conditions but finally drops by 35–37.5% when the velocity is more than 10 m/s. However, the higher discharge energy can hold the machining rate up to a higher velocity level and the highest MRR of 29.27 mm3/min is obtained at 12 m/s flushing velocity. The textural features are mostly akin for low and medium discharges, and few solidified defects like indentation, flakes, thermal spots, cracks, etc., appear on the surface, which is absent for high discharge energies. The EDM-process ensures proper carbonation and heat-treatment to the surface, and a better hardness can be obtained with a higher current and low duty factor.



中文翻译:

通过电火花加工加工的航空级AA6092 / 17.5 SiCp-T6复合材料的表面特性评估

最近开发的复合材料“ AA6092 / 17.5 SiCp-T6”正在逐渐引起国防和航空领域的关注,在这些领域中,需要完成各种制造和材料加工。考虑到这种新兴需求,可能需要在这种材料上生成一些集成的形状或微缝隙。因此,在此分析表面的响应和纹理特征,以评估EDM操作对未来加工的适用性。针对各种冲洗速度和三种不同的排放条件进行了实验,并注意到在各个方面都具有出色的响应。在中低流量条件下,加工速度随着冲洗速度的增加而增加,但当速度超过10 m / s时,加工速度最终下降35–37.5%。然而,在12 m / s的冲洗速度下获得3 / min。纹理特征主要类似于中低放电,很少有固化缺陷,如压痕,剥落,热斑,裂纹等出现在表面上,而高放电能量则不存在。EDM工艺可确保对表面进行适当的碳化和热处理,并且在较高的电流和较低的占空比的情况下可以获得更好的硬度。

更新日期:2021-03-25
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