Bearing in precision grinding, due to rough demanding, the work traces the surface grinding can often be observed to surface grinding traces the naked eye. Mainly the following: First, the manifestations cross spiral traces. The main reason for this is due to traces of the wheel bus straight poor, there is a bump phenomenon, when the grinding wheel and workpiece is only partial contact, when the workpiece or grinding wheel several times back and forth movement, the performance will be reproduced in the workpiece cross and the helix can be observed visually. Pitch and speed of the work table of these spirals, the size of workpiece speed, but also with the wheel axis and the table is not parallel to the rail about.

Mainly due to (a) the bearing surface of the spiral form

1, Dresser bad, not chamfered corners, unused coolant trimming;

2, Table guide rails too much oil, causing the table to float;

3, Machine tool accuracy is not good;

4, The grinding pressure is too big.

Having reasons (two) spiral bearing formation

1, V-shaped track rigidity is bad, when the grinding wheel when an offset, only the edge of the wheel in contact with the work surface;

2, Wheel dressing table commutation speed is unstable, the accuracy is not high, so that the wheel a little less edge trimming;

3, The workpiece itself is poor rigidity;

4, The grinding wheel has broken down too flaking grits and the workpiece attached to the wheel surface iron product, for which should be good dressing wheel scrub clean or rinse with cold water;

5, Wheel dressing is not good, there is a local projection and so on.