The plate hanger should be properly arranged with the diversion hole and the vent hole to ensure the proper flow of the gas and the quenching medium in the furnace, and the gear does not generate large distortion. To choose a reasonable clamping method and hanger structure, it is conceivable to design a casting molding hanger for larger batch production. Due to the high penetration temperature, attention should be paid to the choice of the material of the hanger to ensure that the suspension has a certain strength. In the production process, the maintenance of the carburizing rack should be done to keep the rack flat. It is important to consider reducing the distortion of the gear.
The control of the carburizing atmosphere composition of the carburizing and quenching process, the control of the temperature uniformity in the furnace and the control of the temperature of the quenching medium are directly related to the quality of the gear. The UNICASE sealed box type multi-purpose furnace adopts a circular structure. Through the reasonable distribution of the space and heating power in the furnace, the appropriate galvanic insertion point is carefully designed. The drip-injecting agent and the enriching agent drip at a reasonable position, and the furnace temperature can be evenly distributed. The control of the gas is within 5 °C, and the carbon potential uniformity reaches the international standard of 0.05 (volume fraction). Therefore, the accurate effective hardened layer depth and reasonable carbon concentration distribution of the gear are not difficult, but the gear distortion is still the carburizing quality. key. In addition to the use of pressure quenching process (pressure limiting quenching distortion process), reasonable design of carburizing tools, the selection of appropriate quenching medium is also an effective way to solve the gear distortion.
When designing the gear, the distortion that may occur in the carburizing and quenching should be fully estimated. The shape and thickness of the part should be evenly balanced, and the sharp edges and grooves should be reduced. During the quenching and cooling process of the gear, due to the influence of the gear structure, the hanger and the clamping method and the cooling characteristics of the quenching oil, the cooling speed of each part of the gear will be different, and the various parts of the gear will be under the action of different stress distributions. Produce varying degrees of distortion. The test and production show that the hot oil classification quenching process at 95 °C to 150 °C has a satisfactory effect on reducing and stabilizing the distortion, and the processed gear can basically cancel the grinding process. The cooling method has a significant second direction to the circularity of the transmission without the inner and outer circumferences of the foot.
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