Bearing in the grinding process, its work surface grinding through a high-speed rotating grinding wheel, grinding If you do not follow work instructions, operate and adjust equipment, it will appear in the bearing surface of various defects, which affects the overall quality of the bearing. Bearings, precision grinding, rough demanding work surface grinding traces often can be observed by the naked eye following traces of surface grinding.
    Manifestations cross spiral traces
    Such traces, the main reason is due to wheel the bus straight poor bump phenomenon exists in the grinding wheel and workpiece is only part of the contact, the workpiece or grinding wheel several times and from the exercise performance of the workpiece will reproduce cross helix and the eye can be observed. The pitch of the helix and the workpiece stage speed, the workpiece rotation speed related to the size of the rail is not parallel to the relevant, and also with the wheel axis line and workbench.
    (A) the main reason for the formation of helix
    Wheel dressing bad, the corners are not chamfer, unused coolant trimming;
    2 table rail guide lubricant too many resulting workbench floating;
    The accuracy of the machine is not good;
    The grinding pressure is too large.
    (B) the helix is formed having reason
    1.V shaped rail rigid bad, when the grinding wheel generate offset, only the wheel edge and working contact with the surface;
    Noisy wheel trim workbench commutation speed instability, the accuracy is not high, so that one edge of the grinding wheel dressing slightly less;
    Workpiece rigidity is poor;
    4 on the wheel the broken too flaking grit and workpiece grinding iron filings plot attached to the wheel surface, this should be trimmed a good grinding wheel with the cooling water rinse or scrub clean;
    Wheel dressing is not good, local salience.
    Surface appears scaly
    Reproduction scaly surface trace of the main reason is due to the grinding wheel cutting edge is not sharp, grinding phenomenon "gnawing live", the large vibration. The workpiece surface appears scaly traces specific reasons:
    1 wheel surface garbage and oil material;
    2 wheel Untrimmed round;
    3 wheel blunting. Trimming not sharp;
    Diamond fastening frame firmly shaking diamond or diamond quality is bad not sharp;
    5. The wheel hardness uneven.
    Face napping
    The main reason the surface reproduction nap traces after the shedding of the coarse-grained abrasive, abrasive sandwiched between the workpiece and the grinding wheel.
    Workpiece surface grinding nap specific reasons:
    1. Traces left behind when rough grinding, fine grinding is not worn away;
    2 coarse grains and tiny abrasive particles in the coolant filter is not clean;
    Coarse-grained wheels just trimmed abrasive easy to fall off;
    4. The material toughness valid or grinding wheel is too soft;
    5 abrasive the toughness and workpiece material toughness mis-match.
    The surface of the workpiece straight waveform traces
    We will grind the workpiece vertical axis cross-sectional and zoom, you can see the surrounding area has approximately sinusoidal. Make it the center along the axis without rotating pan waveform cylinder sine wave around the track is also known this for polygonal.


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