Wheel bearing processing technological process

1) Forging blank check first before processing knowledge of the material, forging of blank state ( Generally positive state of tempering, consult the forging certificate material book) 。 Secondly to check if there is a laminated, crack defects such as blank. Measuring the blank shape size. Measure the blank diameter, height size, machining allowance, accurately estimate the turning points number of knife. 2) Turning processing. 2. 1 coarse car: according to the turning process drawing for rough turning processing, cutting speed, cutting process in strict accordance with the provisions of ( General cutting speed for the 5 r/min. Cutting the amount of 10 mm ~ 12 mm) 。 2. 2 rough turning aging: coarse car after the completion of the bearing parts, using three bearing, flat ( Don't allow together) , aging time of not less than 48 hours after the car can be fine processing. 2. 3 fine car bearing parts finishing, cutting speed at six to eight revolutions per minute, cutting quantity to zero. 3 to 0. 5 mm. 2. 4 forming fine cars: finally forming fine car bearing parts, to prevent deformation of parts, parts should be the fixed clamping device to loosen, make parts in no stress state, the turning speed of 8 rotations per minute (RPM), cutting the amount of 0. 2 mm. 2. 5 and three rows of roller wheel bearing inner ring special process: to prevent cross, three rows of roller wheel bearing inner ring deformation after heat treatment. The turning processing must be carried out in pairs processing, namely race back to back processing, heat treatment is not cut off before, after hot cut to shape. 2. After six hot fine cars: bearing inner and outer circle after heat treatment, finish turning into a process, process planning with 2. 3 and 2. 43) Heat treatment - 3. 1 raceway surface quenching: bearing raceway surface of the intermediate frequency quenching, not less than 55 HRC hardness, the depth of hardening layer is not less than 4 mm, soft belt width is less than 50 mm, then make the 'S' in the appropriate place. ( Sometimes the customer requirements can be carburizing, nitriding, carbonitriding, etc. ) 3. 2 hot after tempering treatment: bearing inner and outer circle after medium frequency quenching at 200 degrees c temperature for 48 hours before. In order to ensure the disappearance of the internal stress. 4) Roll, milling processing - 4. 1 for wheel bearings, with internal and external tooth before grinding mill rolling gear process, in strict accordance with the technical requirements processing, precision grade to achieve more than 8. 5) Drilling - 5. Line 1: the measurement of parts after installation dimensions, stipulated according to the drawing size marking, location and working procedure, the hole mutual difference shall not be greater than 0 3%. 5. Test line 2: drilling controlled drawing size, to ensure that the size is correct before drilling process, fission set of wheel bearing mounting holes should be combined in processing, and make the soft belt and white 180 c degrees each pitch error shall not be greater than 5% of 06) Grinding - 6. In the coarse grinding 1: using corundum, soft three particles is 36 degrees, big pore resin grinding wheel for grinding, linear velocity control at 1500 RPM, prevent the raceway burns. Maximum grinding depth shall not exceed 1 millimeter. 6. 2 fine grinding: using particle 46 degrees or 60 degrees resin emery wheel grinding, grinding amount than the coarse grinding, to finish drawing rules level 7) Other components - 7. 1: roller processing or use designated factory by steel roller, precision grade to conform to the requirements of the drawings, mutual difference less than 5% 0, rolling element bearing assembly before must carry on the surface of magnetic powder inspection and ultrasonic inspection, issue the inspection report. 7. 2 retainer: the retainer of the designated manufacturers, using material conform to the requirements of the drawings, assembly before use must carry on the strict inspection, issue the test report. 7. Article 3 seals: the designated factory production of sealing. Before assembly must carry on the strict inspection, and issue a test record. 8) Assembly - 8. 1 make clearance: after grinding to try assembly, in order to measure initial clearance, according to the calculated data and the fitting clearance, and then to the final grinding, with the final drawings specified clearance. 8. Two parts inspection: after completion of clearance preparation, will be the final parts inspection, records accordingly. 8. 3 demagnetization, cleaning, packing and issue a certificate of approval. 9) Present the documents - In order to allow users to better understand the immanent quality of wheel bearing and technology parameters such as material source, provide the following technical data: ( 1) Wheel bearing certificate. ( 2) Wheel bearing installation instructions. ( 3) Bearing parts material certificate ( Material book) 。 ( 4) Rolling body inspection report. ( 5) Bearing heat treatment certificate 10) The attachment - ( 1) Wheel bearing certificate of approval samples. ( 2) Wheel bearing the parts inspection record ( Slightly) 。 ( 3) Wheel bearing product testing records.