1) forging blank checks
Before processing the first understanding the rough material, forging State (normally is tempered State, check out forging certificates of material). Second to check the stock availability of laminated, cracks and other defects.
Measure the rough dimensions. Measure the rough inside and outside diameter, height, size, calculated allowance, a more accurate estimate of the car number of Cutter machining.
2) turning
2.1 bold: according to the drawings of turning technology for rough machining, cutting speed, cutting the amount strictly according to the process regulations (generally cutting speeds for 5 cycles/min. The cutting 10MM~12mm).
2.2 rough turning of aging: INA bearing rough turning is completed, a three-point support, flat (no stacking), the limitation of time of not less than 48 hours before finishing processing.
2.3 essential car bearing oil when cutting speed of 6 to 8 cycles per minute, cutting 0.3~0.5 mm.
2.4 finishing: bearing parts last formed when finishing, in order to prevent deformation of parts, parts shall be a fixed clamping device is released, make parts in a stress-free State, turning speed: 8 per minute, 0.2 mm cutting capacity.
2.5 crossover special, three-row roller slewing bearing inner ring craft: to prevent cross, three-row roller slewing bearing inner ring deformation after heat treatment. Must be taken when turning on the processing, namely roller back processing, heat treatment should not cut off before, when cutting molding.
2.6 when finishing: INA bearings inner and outer rings after the heat treatment, fine turn processes, processes with 2.3, 2.4
3) heat treatment-
3.1 the Raceway surface quenching: bearing Raceway surface of medium frequency induction hardening, hardness no less than 55HRC, case depth is not less than 4 mm, soft band width is less than 50 mm, and in the appropriate Department for the "s" mark. (Sometimes the customer requests for carburizing, nitriding, carbonitriding,)
3.2 after thermal tempering: INA bearings inner and outer rings if needed after quenching at a temperature of 200C degrees for 48 hours to be released. To ensure that internal stress disappear.
4) rolling, milling-
4.1 on the outer and inner gear slewing bearings, hobbing process prior to grinding, strictly according to technological requirements, accuracy to reach level 8.
5) drill-
5.1 line: after the measurement dimensions of parts, dashes, positioning according to the drawing provided process difference between holes no larger than 3%.
5.2 borehole: a controlled drawings testing line size, ensure that the size is correct, and then drilling process combination slewing bearings mounting holes should be processed in the body, and soft with 180C degrees of pitch error shall not exceed 5%
6) grinding-
6.1 rough grinding: adopts the corundum, soft three-particle size to 36 degrees, atmospheric resin grinding wheels for grinding, wire speed control at 1500 r/min, prevent burns to roll. Maximum grinding depth should not exceed 1 mm.
6.2 fine grinding: grinding particle size of 46 degrees or 60 degrees resin wheels, grinding than coarse grinding, finish reaching drawings provided
7) other parts-
7.1 the rolling: the process on your own or use designated manufacturers of steel ball roller, precision class to qualify for drawings, rolling mutual difference that is less than 5%0,INA prior to bearing Assembly for ultrasonic flaw detection of surface magnetic particle inspection and shall produce inspection reports.
7.2 retainer: point producers in cage, using materials comply with the drawings, Assembly before use to a rigorous inspection, test reports issued by them.
7.3 sealed ring: using site-directed manufacturers to produce seals. Before Assembly to conduct rigorous testing, and issue inspection reports.
8) Assembly-
8.1 preparing clearance: grinding and try to assemble in order to detect initial clearance, according to the calculations and the fitting clearance, then finally grinding to enjoy the final drawings to provide clearance.
8.2 part inspection: clearance after preparation is complete, then the final part inspection, and for the corresponding record.
8.3 demagnetization, cleaning, packaging and issue a certificate.
9) the originals and file-
In order to give the user a better understanding of slewing bearing inner quality and technical parameters, such as source material, provide the following technical information:
(1) wheel bearing certificate.
(2) wheel bearing installation and user manual.
(3) certificate of bearing materials (materials).
(4) rolling inspection reports.
(5) the INA bearing heat treatment certificate




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