Ball after heat treatment in the grinding ball machine with grinding wheel grinding method called grinding hard, and its role is to eliminate soft tactics (or light grinding) defect, remove the heat generated in the surface oxidation, decarburization, deformation and troostite tissue defectsfurther improve the accuracy and surface quality.

Or after the ball hard grinding process should be carried out visual inspection of surface defects after cold pickling check burns, burns, generally can be divided into the second tempering burns and secondary quenching burns, second tempering burns after cold pickling significant black secondary quenching burns after cold pickling middle gray martensite surrounded by black troostite. Showing the linear burn, punctate burns and poles burns (large ball burns).

Linear burns reasons:

A cast iron plate or wheel groove is too deep to affect the ball's rotation flexibility;

2 cast iron plate or wheel face is not parallel or trench depth is inconsistent, resulting in the phenomenon of friction of the ball top ball;

3 cast iron plate or wheel a trench is not consistent;

Distributor of cast iron plate junction does not match;

5 cast iron plate at the entrance to the bell is too large, so that the ball contacts the edge of the wheel groove;

6. The flow of the ball groove of the slope is adjusted properly, the ball flows too fast or too slow;

Wheel out the grain (block) blocked out of the ball did not go well;

8 Synechococcus suction bulb angle of the blades flat, or wear into a concave shape, Synechococcus is not smooth;

Working pressure is undue.


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