The cause of the bearing surface grinding defects - bearing knowledge

Bearing in the process of grinding, the surface is working on the high-speed rotation of the grinding wheel grinding, therefore when grinding if not operated according to the working instruction and adjust equipment, will work in the bearing surface flaws, that affect the overall quality of the bearing. Bearing in the precision grinding, due to high demand for rough, work surface grinding traces can often use the naked eye to observe its surface grinding marks mainly has the following kinds. Traces of the performance of cross helical traces appear this kind of reason is mainly due to the grinding wheel bus flat laymen is poor, there is concave and convex phenomenon, when grinding, grinding wheel and workpiece is only part of the contact, or after grinding wheel movement back and forth several times, when the workpiece in artifacts will reappear cross helix and the naked eye can be observed. These spiral pitch and the size of the workpiece speed, workpiece speed, but also associated with grinding wheel axis and workbench guide rail is not parallel. ( A) The main reason for the spiral form 1. Grinding wheel dressing, edge chamfer, coolant not used for finishing; 2. Workbench guide guide oil too much, cause a workbench floating; 3. Machine tool accuracy is bad; 4. Grinding pressure, etc. ( 2) 1 helix formation has a reason. Vee way bad rigidity, when grinding wheel to produce deviation, only edge grinding wheel surface contact with work; 2. Trim noisy round table when the reversing speed is not stable, accuracy is not high, a edge dressing grinding wheel is made slightly less; 3. The artifact itself rigidity is poor; 4. Have broken too peeling sand grinding wheel and workpiece under the grinding of iron product attached to the grinding wheel surface, therefore should be dressed wheel with cooling water flushing or scrub clean; 5. Grinding wheel dressing is bad, such as local protuberance. Reappearance covered surface covered surface traces of the main reason is because of the grinding wheel cutting edge is not sharp, 'eating up' occur when grinding, the vibration is larger. The specific cause of workpiece surface appear designed in trace is: 1. Grinding wheel surface is rubbish and oil dirt; 2. Grinding wheel not nap circle; 3. Grinding wheel dull. Trimming is not sharp; 4. Diamond fastening frame is not strong, shaking or diamond quality is bad is not sharp; 5. Wheel hardness uneven and so on. Working surface roughening surface representation of hair trace after falling off the main reason is because the coarse-grained grits, between workpiece and grinding wheel grinding grain and cause. Workpiece surface during grinding were gigging specific reason is: 1. Legacy of trace coarse grinding, fine grinding when not wear off; 2. Cooling fluid in the coarse grinding particles with small particle filtering is not clean; 3. Coarse-grained grinding wheel just trimmed when grinding grain is easier to fall off; 4. Material toughness is valid or grinding wheel too soft; 5. Abrasive particle toughness and workpiece material toughness mismatch, etc. Workpiece surface has direct waveform tracks we will ground workpiece axis of vertical line cut a cross-sectional and amplification, can see its peripheral similar to sine wave. Turns its center along the axis without translation, the perimeter of the sine wave trajectory is corrugated cylinder, also called the polygon.