OEM Black Angle Aluminum Corner Connector For 20mm Extrusion

Grinding cracks

When the contact surface between the grinding wheel and the workpiece is large, the grinding wheel is too blunt, the feed rate is too large, and the workpiece is not at the right time, the grinding stress of each part of the workpiece surface will change greatly, and the compressive stress state of the carburized layer of the workpiece will be seriously damaged. The surface of the workpiece is transformed from a state of compressive stress to a state of tensile stress. When the stress exceeds the strength limit of the workpiece itself, cracks will occur on the surface of the part. Its characteristic is that the cracks are narrow and mostly perpendicular to the grinding direction. The distribution of magnetic marks on the surface of the cam forging is relatively scattered. There are magnetic marks on the finely ground surface after heat treatment and the machined surface before heat treatment, which can preliminarily rule out the possibility of cracks caused by grinding.

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