ABSTRACT

In recent years, increasing demand for biodegradable lubricants has been observed in precision machining owing to ISO 14000, which draws more attention toward the operator’s health and environmental issues. In this context, vegetable oils are adopted as eco-friendly lubricants in sustainable lubrication techniques such as Small Quantity Lubrication (SQL). The grinding performance and surface integrity of AISI H13 die steel may also be improved via SQL. The present study aims at revealing the best lubricant for work material by comparing the lubricating characteristic of vegetable oils like castor, groundnut, sunflower, and soybean. The lubrication characteristics were studied in terms of force ratio, surface roughness, surface topography, microchip morphology, and wettability. Experiential results revealed that castor oil exhibited superior lubricating performance, including the lowest force ratio and surface roughness (R_ɑ: 0.147 µm and R_z: 1.122 mm), and outstanding surface quality. Furthermore, the wide bearing area (BC) curve and a higher BC ratio (81.76%) indicated the development of an excellent antifriction ground surface in the case of castor oil. The spherical and burnt chips were observed at an infeed of 32 µm in the case of soybean oil. The viscosity of the lubricant significantly influenced the wettability. The lower viscous soybean oil promoted better lubricant wettability in the machining zone.

摘要

近年来，由于ISO 14000，在精密加工中对可生物降解润滑剂的需求不断增加，这引起了操作员的健康和环境问题的更多关注。在这种情况下，植物油在可持续润滑技术（例如小批量润滑（SQL））中被用作环保润滑剂。AISI H13模具钢的研磨性能和表面完整性也可通过以下方法得到改善SQL。本研究旨在通过比较蓖麻，花生，向日葵和大豆等植物油的润滑特性，揭示出用于工作材料的最佳润滑剂。在力比，表面粗糙度，表面形貌，微芯片形态和润湿性方面研究了润滑特性。经验结果显示，蓖麻油显示出优异的润滑性能，其中包括最低力比和表面粗糙度（ř _ɑ：0.147微米和- [R _ž：1.122 mm），并具有出色的表面质量。此外，宽的轴承面积（BC）曲线和较高的BC比（81.76％）表明，在蓖麻油的情况下，具有优良的抗磨地面。对于大豆油，在进料口为32 µm时观察到球形和烧焦屑。润滑剂的粘度显着影响润湿性。较低粘度的大豆油在加工区促进了更好的润滑剂润湿性。