The actual grain size test of a number of batches of materials was carried out. It was found that a considerable portion of 20crMniT steel was kept at 930 ° C for 3 h, and the actual grain size obtained was only 2 to 3 grades. The carburized gears were made from such materials. It is a large-scale layered structure and a heart tissue with mixed crystals. Gear manufacturers with certain testing methods should strengthen this aspect of testing to ensure good microstructure and mechanical properties of gear heat treatment. Heat treatment of gear heat treatment is a key process to ensure the quality of the gear. Many key characteristics of the gear are realized and guaranteed by heat treatment. The quality of the gear heat treatment directly affects the tooth surface engagement and service life of the gear. The motorcycle shift gear is particularly prominent in this respect.
The choice of heat treatment equipment gear quality depends to a large extent on the heat treatment equipment. Motorcycle gears have strict requirements on the material, surface and core structure, hardness, distortion, tooth surface contact area and running noise. Therefore, choosing excellent heat treatment equipment is the key to producing high quality motorcycle gears. . If the gearing is carburized (carbonitriding) due to equipment reasons, the control error of the carbon potential is large, the temperature and atmosphere in the furnace are not uniform, the quenching oil is stirred, the circulation control is improper, etc., which may cause the effective hardened layer depth of the gear, The surface carbon concentration, surface and core hardness are not uniform, and the quenching distortion is large. When it is serious, the gear will be scrapped.
The UNICASE sealed box type multi-purpose furnace is selected because it has the advantages of high temperature and carbon potential control precision, good furnace temperature and uniformity of the atmosphere, and flexibility of process conversion, which can complete multi-variety gears in a short time. Cross-production, easy to operate, easy to maintain, using a two-channel program controller and oxygen probe to control the furnace atmosphere, can achieve carburizing, carbonitriding, bright quenching and other surface hardening treatment without special furnace. Many defects of heat treatment of carburizing rack gears, such as effective hardened layer depth and surface carbon concentration, surface hardness unevenness, gear distortion, etc., are all related to the unreasonable design of carburizing racks. Carburizing hangers, especially the main and auxiliary shifting gear shaft carburizing hangers, should be considered without deteriorating the uniformity of the furnace atmosphere.
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