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为了改善磨削强化层的表面质量,将微量润滑(简称MQL)应用于磨削强化工艺。采用MQL技术对40Cr钢进行磨削强化试验,研究了润滑冷却工艺,如磨削液供给方式、MQL喷射流量、空气压力等对磨削强化层深度、表面显微硬度和表面粗糙度等的影响。结果表明:在湿磨条件下,工件表面没有产生强化层;在MQL磨削条件下,获得的强化层深度略低于干磨,但表面显微硬度较干磨有所提高,且MQL下工件表面的粗糙度低于干磨;在MQL磨削强化中,增加MQL喷射流量和空气压力均有利于提高强化层的表面硬度和降低表面粗糙度。因此,MQL磨削强化能提高工件表面的质量,改善零部件的使用性能。
In order to improve the surface quality of the grinding strengthened layer, trace lubrication (MQL) is applied to the grinding strengthening process. The 40Cr steel was subjected to the grinding strengthening test by MQL technology. The effects of lubrication cooling process such as grinding fluid supply mode, MQL jet flow rate and air pressure on the grinding depth, surface microhardness and surface roughness were investigated . The results show that no strengthening layer is formed on the surface of the workpiece under wet grinding conditions. The depth of strengthening layer obtained under MQL grinding condition is slightly lower than that of dry grinding, but the surface microhardness is higher than that of dry grinding, The surface roughness is lower than that of dry grinding. In MQL grinding strengthening, increasing the MQL jet flow rate and air pressure are helpful to improve the surface hardness of the strengthened layer and reduce the surface roughness. Therefore, MQL grinding can enhance the quality of the workpiece surface, improve the performance of parts.