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<p>This research studied the effect of cutting fluids on surface roughness, microhardness and texture in hard drilling of AISI D2 using minimum quantity lubrication. Three levels of feed rate, cutting speed, and lubricant oil (mineral, vegetable, synthetic) were considered. Results showed the priority of soybean oil in creating a smoother surface (Ra<sub>avg</sub> = 1 µm and Rz<sub>avg</sub> = 3.7 µm) due to the higher viscosity, presence of strong fatty acids, and polar molecules adhering to the metal surface. In addition, feed rate had superior contribution on increasing the surface roughness especially for Rz with synthetic oil (85.3 % contribution). For microhardness, synthetic oil resulted in the highest values, while vegetable oil produced the lowest (634 Hv). Increased feed rates and cutting speeds hardened the hole surface up 8.9 % and 7.3 %. In general, vegetable oil limited the negative effect of feed rate at higher values, made it possible to reduce machining time without compromising the hole quality.</p>

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Study of surface roughness, texture, and microhardness in hard drilling of AISI D2: The critical role of cutting oil in minimum quantity lubrication

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Amir Rasti,
  • Ali Zeinolabedin-Beygi,
  • Hamed Hassanpour,
  • Ahmad Reza Omiddodman

摘要

This research studied the effect of cutting fluids on surface roughness, microhardness and texture in hard drilling of AISI D2 using minimum quantity lubrication. Three levels of feed rate, cutting speed, and lubricant oil (mineral, vegetable, synthetic) were considered. Results showed the priority of soybean oil in creating a smoother surface (Raavg = 1 µm and Rzavg = 3.7 µm) due to the higher viscosity, presence of strong fatty acids, and polar molecules adhering to the metal surface. In addition, feed rate had superior contribution on increasing the surface roughness especially for Rz with synthetic oil (85.3 % contribution). For microhardness, synthetic oil resulted in the highest values, while vegetable oil produced the lowest (634 Hv). Increased feed rates and cutting speeds hardened the hole surface up 8.9 % and 7.3 %. In general, vegetable oil limited the negative effect of feed rate at higher values, made it possible to reduce machining time without compromising the hole quality.