FAG spherical roller bearing ring fracture causes and countermeasures (Liaocheng Jinsheng Bearing)

Ring fracture is troubled by FAG spherical roller bearings quality One of the problems, and defects ring fracture fracture is the main form of existence, its causes are mainly raw materials, production of their own problems or improper operation, the equipment can not operate normally cause. Analysis of current realities below.
   First, the raw material
   Mixed raw materials, loose, brittle carbide segregation or liquation, mesh, ribbon, not spared even segregation defects in the processing of not being eliminated or improved, will cause stress concentration and weaken ferrule basic strength, become crack sources. Prevention is the main channel of supply persist, try to purchase reliable quality steel to strengthen the purchase of steel warehousing inspection, from the source to good relations.
   Second, the production and equipment
   1 Forging: Forging process if produced a burning, overheating, etc. within the fragmented into mesh carbide rings will reduce the toughness and strength. It must always be strictly controlled processing temperature calcination cycle of heating and cooling conditions (such as spray cooling), etc., especially bigger breeds ferrule final forging, the temperature above 700 ℃, shall not be stacked display.
    (2) Heat treatment: heat treatment equipment to closely monitor the workshop an important work.
   Monitoring equipment reliability. On the instrument, thermocouple, and other important thermostat apparatus shall closely monitored to ensure accurate and reliable measurement data; exceeded the error must be promptly replaced, prohibited ill run.
   Monitoring data records. Must restore the temperature of the heat treatment equipment, recording devices, so that the whole process of the equipment (night shift focus) Industrial effective monitoring, the quality of the heat treatment has a strong traceability eliminate false records and randomness, as well as provide a complete ISO9000 quality system the data sheet.
   Quench cooling. To address the large variety FAG spherical roller bearing rings soft spots and other defects, should be measured quenching oil composition and performance, non-conforming to the pre-order replacement to fast quenching oil substitute, to enhance the ability to quench hardenability for the media, quenching conditions improve.
   Strict backing bearings rocess. For breakage occurred more varieties, in its post-secondary tempering ferrule coarse, so that can further stabilize the organization and size of the ferrule, and a reduction in grinding stress, improve grinding metamorphic layer performance. There have been recent 22328/02 and 22236/02 two varieties in the second tempering process, pending sales tracking feedback verification.
    3 grinding step of monitoring. Finished FAG spherical roller bearings and rings are not allowed grinding burn grinding cracks exist, especially with the inner surface of a screwdriver may not have the degree of burns. If ferrule full inspection should be carried out after pickling, excised burn products, severe burns or repair can not repair defective should be scrapped, grinding burn are not allowed to enter the ferrule assembly process.
    4. Identity management, steel storage after grinding to a ferrule before, the process must be strict management and strict distinction between two different materials GCr15 and GCr15SiMn materials and products.
   Third, the ferrule overload fracture and fatigue fracture possibilities exist, especially in the poor conditions of service FAG spherical roller bearings (such as 22328, etc.). Right ring fracture phenomena, not only from the materials and manufacturing defects generated in the process to consider these angles, but also on FAG spherical roller bearing parts of the structure size, processing means of measurement, processing, FAG spherical roller service conditions and other factors bearing research and analysis.
    1.FAG aligning roller bearing structure and conditions of service. Different structures for different conditions of service; FAG spherical roller bearing parts processing technology on their different structures vary, also affect its quality. Therefore, we should develop new structured products, in order to adapt to different conditions of service, and in the FAG spherical roller bearings indicate its suitability for use on the service conditions or performance, in order to facilitate customer choice.
    (2) to strengthen technology research, improved processing techniques to improve processing quality and reduce the possibility of processing defects. If the heat treatment on the larger species inside and outside the ring, as far as possible with the minimum quenching temperature, holding time to adapt to enhance the alloying concentration, increasing the fracture strength of martensite, and in the selection of the premise of guaranteeing quality higher tempering temperature of the workpiece in order to enhance impact toughness.
    3. Improved processing means of monitoring and promoting quality improvement process. Such as improving the monitoring of the flow path curvature position, improve FAG spherical roller bearings assembled overall performance, improve FAG spherical roller bearings working conditions.