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INA bearings grinding process, its working surface is grinding through a high-speed rotating grinding wheel, grinding if you do not follow the operating instructions and adjust equipment, it appears on the bearing surface flaws, which will then affect the overall quality of the bearings. INA bearing in precision grinding, because the rough is very high, working surface of grinding traces are often observed with the naked eye it marks mainly has following several kinds of surface grinding. Manifestations cross the spiral marks this mark mainly due to poor wheel bus straight there is phenomenon of convex, grinding, grinding wheel and the workpiece contact is only partially, after when the workpiece or grinding wheel back and forth movement, the workpiece will again cross screw and can be observed with the naked eye. The helical pitch and speed of the workpiece, the workpiece speed relative to the size of, and parallel to the wheel axis and table rails are not related.
(A) Helix formation: the main reasons 1. bad dressing, corners are not chamfered, does not use cooling liquid dressing; 2. table Rails too much lubricating oil, table floats; 3. bad machine tool accuracy; 4. grinding too much stress and so on. Specific reasons for Helix formation: 1. V shaped guide rigid bad, dang grinding Shi wheel produced offset, just wheel edge and work surface contact; 2. trimming fight round Shi bench reversing speed not stability, precision not high, make wheel a a edge trimming slightly less; 3. workpiece itself rigid poor; 4. wheel Shang has broken too peeling of sand grain and workpiece grinding Xia of iron product attached in wheel surface Shang, for this should will trimming good of wheel with cooling water flush or scrub clean; 5. wheel trimming bad, has local raised,.
(B) appeared on the surface squamous: reproduction of fish on the surface squamous traces the main reason is due to the grinding wheel cutting blade is not sharp enough, grinding occurs when "eating" phenomenon, when vibration is large. Specific reasons for causing signs appeared on workpiece surface squamous: 1. grinding wheel surface litter and pollution; 2. unfinished circle; 3. dull wheel. Trimming is not sharp enough; 4. Diamond tighten loose, diamond rock or diamond quality is not sharply; 5. grinding wheel hardness is not uniform. Face picking surface reproduction signs of galling is the main reason as coarse-grained debris falling off after, caused by wear particles caught between workpiece and wheel.
(C) workpiece surface in grinding Shi is napping: specific causes is: 1. rough mill Shi legacy down of traces, fine mill Shi is not mill off; 2. cooling liquid in the rough mill grain and tiny mill grain filter not clean; 3. rough grain degrees wheel just trimming good Shi mill grain easy shedding; 4. material toughness validity or wheel too soft; 5. mill grain toughness and workpiece material toughness tie improper, workpiece surface has straight waveform traces we will mill had of workpiece vertical axis line stopped a cross section and zoom, can see its around approximate Yu sine wave. Make it along the axis of the centre line without turning pan, sine waveform is the trajectory around cylinder, also known as polygons.
(D) direct waveform traces: due to relative movement of the workpiece or grinding wheel of grinding wheel on workpiece grinding vibration caused by cyclical changes in pressure of excuse. This vibration is probably forced vibration, may also be the self-excited vibration and therefore direct wave frequency on the workpiece is often more than one. Produced straight waveform traces of specific causes is: 1. Wheel spindle gap had large; 2. wheel hardness too high; 3. wheel static balance bad or wheel variable blunt; 4. workpiece speed high; 5. horizontal Yuan knife too large; 6. Wheel spindle bearing wear, tie gap had large, produced radial beats; 7. wheel pressure tight institutions or bench "crawling",.
(E) were burned during the grinding process on workpiece surface: surface grinding process tends to burn, burn, there are several types, wheel machining direction is burned, is dark-colored plaque two lines or intermittent line. Workpiece surfaces were burned during the grinding process, Antibody up has following several causes: 1. wheel too hard or grain degrees too fine organization had key; 2. feed had large, cutting liquid supply insufficient, thermal conditions poor; 3. workpiece speed low, wheel speed had fast; 4. wheel vibration pendulum had large, due to grinding depth constantly occurred changes and burns; 5. wheel trimming than or when trimming bad; 6. Diamond sharp, wheel trimming bad; 7. workpiece rough mill Shi Burns had deep, fine mill left volume and too small, no mill off; 8. workpiece clip tight force or suction insufficient, in grinding force role Xia, workpiece exists stopped go phenomenon,. The workpiece surface during the process of grinding burn black how do I know if it? You can check it out by periodic acid. The workpiece after pickling, surface when moist, immediately under the broad Visual inspection, a normal surface is uniformly dark gray. Software, renders the clouds of dark black spots and boundary is uncertain if decarbonisation, renders the gray or dark black spots if the grinding crack, crack crack, burn, one wheel machining direction surface dark-colored plaque, the second is to render lines or intermittent lines. As these burn during the grinding process, it must immediately analyze the causes and take effective measures to solve them, to prevent bulk burn.
(F) surface roughness does not meet the requirements: surface roughness of bearing parts are standards and requirements, but in the process of grinding and Superfinishing, for various reasons, often does not meet the specified requirements. Caused workpiece surface rough degrees up not to requirements of main causes is: 1. grinding speed low, into to speed had fast, into knife volume had large, no into to grinding time had short; 2. workpiece speed high or workpiece axis and wheel axis vibration had large; 3. wheel grain degrees too rough or had soft; 4. wheel trimming speed had fast or trimming institutions gap had large; 5. trimming wheel of diamond not sharp or quality bad; 6. Super fine with oil stone quality bad, installed location not correctly; 7. Super fine with kerosene quality up not to requirements; 8. Super fine time had short,;
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-32014X NTN | 70 | 110 | 25 |
| 32914XU NTN | 70 | 100 | 20 |