Experimental Research On Grinding Performance Of TC17 Alloy With Microcrystalline Alumma Grinding Wheels

Titanium alloy has been widely used in aeronautics and astronautics industry owing to its unique combinations of properties. However its low heat transfer coefficient, great chemical activity and small elastic modulus may lead to elevated temperatures at the grinding zone and possible thermal damage, residual stress and micro-structural changes in the surface layer. These effects can be highly damaging to workpiece life and component quality, which make it a typical difficult-to-machine material. New microcrystalline alumina grinding wheels are emerging in recent years for titanium alloy grinding. It has good self-sharpening ability, less material adhesion, long life, good applicability to grinder and other advantages, which makes it an important development direction of titanium alloy grinding.Currently research related to titanium alloy grinding with microcrystalline alumina wheel is not much. The surface grinding experiment were conducted with microcrystalline alumina grinding wheels of normal and large pores on titanium alloy TC17, the main work includes:(1) The surface integrity of workpiece ground with microcrystalline alumina grinding wheels of normal and large pores under dry grinding and wet grinding were compared, which indicated that the surface integrity of workpiece ground with microcrystalline alumina grinding wheels of large pores under wet grinding has been greatly improved:improved morphology (no micro-cracks), reduced surface roughness, reduced grinding white layer and the heat-affected layer, weakened surface hardening and softening and decreased surface residual stress.(2) Surface morphology before and after grinding and grinding temperature were compared. The results showed that under wet grinding microcrystalline alumina wheel of large pores has less adhesion and better self-sharpening, which leads to lower grinding temperature. It was proved that the better cooling and lubrication quality, better self-sharpening and larger chip space may be the dominant reason.(3) Single-factor grinding experiments on titanium alloy TC17 were conducted with microcrystalline alumina wheel of large pores to investigate the influence of grinding parameters (such as wheel speed vs, workpiece feed rate vw, grinding depth ap) on the grinding temperature and surface roughness. However the results were not fully consistent with the traditional experience due to unique characteristics of microcrystalline alumina wheel.