What is the impact of grinding heat on the machining of cylindrical grinders?
Causing surface burnout of the workpiece: The surface of the workpiece may be burnt under high temperature.
The so-called burnout generally refers to the uneven annealing of the metal material on the surface of the quenched workpiece under the action of grinding heat. As a result, the surface hardness of the workpiece decreases, which affects the performance and lifespan of the parts.
The surface of the severely burned workpiece can be seen with the naked eye, presenting a layer of burnt yellow or burnt black oxide film.
The surface of the slightly burnt workpiece appears pale yellow. Grinding materials with poor thermal conductivity, such as bearing steel, heat-resistant alloy steel, etc., is prone to burning out.
Residual stress and cracks on the surface of the workpiece: When the temperature in the grinding zone reaches a point where the metallographic structure of the metal material changes, it causes changes in the metallographic structure of the metal surface and generates stress. When the local stress exceeds the strength limit of the workpiece material, cracks appear on the surface of the workpiece.
Affects the machining accuracy of the workpiece: Grinding heat can cause thermal expansion deformation of the workpiece, affecting its shape and dimensional accuracy.