1. Forging: if forging process had over-burning, overheating, cracking into network carbides will reduce the ferrule toughness and strength. Therefore, we must always strictly control the processing temperature, circulation heating and cooling conditions after forging (such as spray cooling), etc., especially after the larger varieties of ferrules final forging, the temperature is above 700 ℃, shall not be deposited stacked. 2. Heat Treatment: Close monitoring of heat treatment equipment is an important part of the workshop. Monitor equipment reliability. The instrument, thermocouple and other important temperature control devices must be closely monitored to ensure accurate and reliable measurement data; error over time should be promptly replaced, is strictly forbidden to run. 3 grinding process monitoring. Finished imported bearing rings do not allow grinding burns and grinding cracks exist, especially with the inner surface of the taper with no burns. If the ferrule should be fully seized after pickling, remove the burn products, severe burns can not be repaired or rework failed should be scrapped, does not allow grinding burrs into the assembly process. 4. Mark management, steel storage to the ferrule after grinding, the process must be strictly managed, strict distinction between GCr15 and GCr15SiMn two different materials and products.
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