Experimental research on creep feed deep profile grinding of small-module gears

Abstract

In view of the long process route of high-precision gear machining, a method of creep feed deep profile grinding of small-module gears was proposed. The experiments of creep feed deep profile grinding of small-module gears were carried out. The effects of different feed speeds on the grinding power, the workpiece grinding burn and the grinding wheel wear were analyzed. The wear process of grinding wheels was studied by replica method. The results show that the grinding power peak increases with the increase of feed speed. When the feed speed exceeds 150 mm/min, the grinding burns occur on the workpiece surface. Besides, the hardness of the grinding surface is significantly higher than that of the initial hardness, and the martensitic phase transformation occurs on the workpiece surface. As the depth from the grinding surface increases, the hardness values show a downward trend, and the depth of the hardness layer at the tooth bottom is smaller than that at the both sides of the tooth profile. The wear process of grinding wheels is divided into initial wear stage, stable wear stage and rapid wear stage. The material removal volume of stable wear stage is about 2 000 mm3. Excessive feed rate will cause severe wear of the grinding wheel.

Keywords

• gear
• creep feed deep profile grinding
• grinding power
• grinding burn
• grinding wheel wear