Metal Removing Thermal Stress Influences on Hardness and Tensile Strength Properties of Machined Items for Aeronautic Applications

The heat of metal removing process has critical influences on properties of machined item and can cause thermal damage and conflicts directly with the demand for increased production efficiency. The grinding process requires a very high input of energy per unit volume of material removed. A significant portion of the energy is converted to heat, which is concentrated within the grinding zone, thereby leading to high temperatures and possible thermal damage to the work-piece. The effect of grinding-induced heat on Hardness and Tensile strength of machined steel in metal removing process has been investigated using manufacturing equipment, temperature controlling methods, mechanical properties testing machines and microscope (ESM) for laboratory experiments. The relationship between the residual thermal stresses in the surface region, caused by grinding, and changes of some mechanical properties of the machined steel is elucidated.