An investigation on surface grinding of hardened stainless steel S34700 and aluminum alloy AA6061 using minimum quantity of lubrication (MQL) technique
An investigation on surface grinding of hardened stainless steel S34700 and aluminum alloy AA6061 using minimum quantity of lubrication (MQL) technique
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DOI：
10.1007/s00170-013-4830-3
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发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
M. Hadad;M. Hadi
中科院分区：
文献类型：
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作者：
M. Hadad;M. Hadi
在磨削过程中，磨料在材料去除过程中与工件发生切入和滑动，具有较高的比能耗和磨削区温度。为了提高加工效率，润滑成为磨削液的重要要求，沿着切屑去除和冷却磨削区。磨削液对工作环境和加工成本有负面影响，包括机器操作员的健康、污染、爆炸（油）的可能性、过滤和废物处理。据报道，使用润滑剂消耗极低的最小量润滑（MQL）是一种技术和环境上可行的泛液冷却替代方案。本文研究了硬化不锈钢（UNS S34700）和铝合金AA 6061的干式、MQL和常规流体磨削工艺的磨削性能。试验了一种SiC砂轮和五种Al_2O_3砂轮（砂轮）以及植物和合成酯MQL润滑油。砂轮和冷却剂润滑剂类型的影响进行了研究的磨削力，表面形貌和表面温度的基础上。发现合成酯MQL油比植物MQL油提供更好的研磨性能。有人认为，酯油的性能改善是由于在磨料和工件上形成摩擦膜，通过抑制金属-磨料相互作用来增强润滑。此外，被发现的可磨性的加工标本，大大增加使用MQL磨削工艺与软，粗轮。在AA 6061合金的MQL磨削中，使用植物油导致最低的表面粗糙度，而使用合成酯添加剂导致最高的表面粗糙度，因为砂轮上的更高的切屑负载，因此更多的再沉积材料在工件表面上。
In grinding process, the abrasives plunge and slide against the workpiece during material removal with high specific energy consumption and high grinding zone temperature. To improve process efficiency, lubrication becomes an important requirement of the grinding fluids, along with chip removal and cooling the grinding zone. Grinding fluids have negative influences on the working environment and machining cost in terms of the health of the machine operator, pollution, the possibility of explosion (for oil), filtering, and waste disposal. The use of minimum quantity of lubrication (MQL) with an extremely low consumption of lubricant has been reported as a technologically and environmentally feasible alternative to flood cooling. This paper deals with an investigation of the grindability of hardened stainless steel (UNS S34700) and aluminum alloy AA6061 using dry, MQL, and conventional fluid techniques. One type of SiC and five types of Al2O3wheels (corundum) as well as vegetable and synthetic ester MQL oils have been tested. The influences of wheel and coolant–lubricant types have been studied on the basis of the grinding forces, surface topography, and surface temperature. Synthetic ester MQL oil was found to give better grinding performance than the vegetable MQL oils. It was argued that the improved performance of the ester oil is caused by the formation of tribo-films on the abrasives and the workpiece, which enhances lubrication by inhibiting metal–abrasive interaction. Also, the grindability of the machined specimens was found to increase substantially by using the MQL grinding process with soft and coarse wheels. In MQL grinding of AA6061 alloy, the use of vegetable oil resulted in the lowest surface roughness, whereas using synthetic ester additives lead to highest surface roughness because of higher chip loading on the grinding wheel and consequently more redeposited material on the workpiece surface.