Abstract
The gear was deal with electron beam, and microhardness, roughness, topography and organization structure and stress on gear surface was measure and their effect to gear bending fatigue strength was analyzed and discussed. Experimental of gear bending fatigue strength was accomplished and contrasted before and after they were dealt with pulsed electron beam after grinding tooth surface. The surface hardness of 40Cr can be changed within in 2 mm under the surface. For grinding gear which was treated by electron beam, tooth surface roughness has a certain degree of enhancement. Because electron beam has the polishing effect, so many small scratches on the root surface of the grinding gear have disappeared, and the grain size in the material's surface has been refined. The results demonstrated that gear bending fatigue strength after irradiation was improved 6.1% than that before irradiation at the condition of reliability 50%.
