INVESTIGATION OF THE INFLUENCE OF CREEP FEED GRINDING SPEED AND ABRASIVE TOOLS CHARACTERISTICS ON THE QUALITY OF TITANIUM ALLOY SURFACE CONDITION

Abstract

The process of creep feed grinding of titanium alloy Ti6Al4V with high porosity circles of silicon carbide of 64CF80H12V and 64CF100I12V characteristics produced by JSC "Volzhsky Abrasive Plant" is considered. The morphology and chemical composition of the surfaces obtained at a grinding speed of 20-30 m / s were examined with a double-beam electron microscope. Surface roughness control was performed using a modern profilograph, profilometer. The chemical composition and roughness of the machined surface were determined in 10 sections, uniformly distributed along the length of the workpiece. It was found out that abrasive tool characteristic does not influence the general character of the formation of the morphology of the titanium alloy surface. It was proved that, as a result of adhesion-cohesive interaction, concentration of silicon on the machined surface of the titanium alloy increases with increasing grinding speed The increase of the grinding speed by 1.5 ensures the increase in the average silicon concentration by 1.6-1.8 times. The change in the hardness of the grinding wheel does not significantly affect the transfer of the abrasive material to the titanium alloy. The influence of the grinding speed and tool hardness on the values of the arithmetic mean deviation of the profile Ra on the entire length of the workpiece, the stages of the constant length of the arc of the contact and the output was considered. It was found out that the values of Ra parameter at the stage of constant contact arc length are greater than at the output stage by 30-40% when machined with a wheel of 64CF80H12V and by 15-30%, respectively, when machined with a wheel of 64CF100I12V. The increase of the grinding speed from 20 m / s to 30 m / s has a significant effect on the roughness of the machined surface only at the output stage.