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磨削烧伤实质上是由于磨削温度过高,引起被磨削工件表面层的金相组织变化,而金相组织变化与表面层的显微硬度变化有着密切的联系。被磨削工件表面层的显微硬度变化又与磨削温度的变化有着密切的联系。我们可以从表面层显微硬度的变化来反映磨削温度的变化;同时也能反映工件磨削烧伤的程度。磨削烧伤有两种情况。第一种是由于磨削温度超过材料的相变温度,往往造成“二次淬火”烧伤;第二种是磨削温度虽很高,但没有超过材料相变温度,往往会造成“回火”烧伤。为了比较断续磨削(开槽砂轮)和普通磨削(不开槽砂轮)的切削性能,本试验中采用的开槽砂轮见图1。砂轮性能参数为GB60ZR_2AP300×40×127。
Grinding burn is essentially due to the grinding temperature is too high, causing the surface layer of the workpiece is grinding metallurgical changes, and changes in the microstructure and the surface layer of microhardness changes are closely linked. The change of microhardness of the surface layer of the workpiece to be ground and the change of grinding temperature are closely related. We can reflect the change of the grinding temperature from the change of the microhardness of the surface layer; at the same time, it can also reflect the degree of burn of the workpiece grinding. There are two cases of grinding burns. The first is due to the grinding temperature exceeds the phase transition temperature of the material, often resulting in “secondary quench” burn; the second is the grinding temperature is high, but did not exceed the material phase transition temperature, often resulting in “tempering” burn. In order to compare the cutting performance of intermittent grinding (grooving grinding wheel) and ordinary grinding (non-grooving grinding wheel), the grooving grinding wheel used in this experiment is shown in FIG. 1. Grinding wheel performance parameters GB60ZR_2AP300 × 40 × 127.