A carburizing and quenching process for internal spline gears

Abstract

The invention relates to a gear machining process, and in particular relates to a carburizing and quenching process of internal spline gears. By adopting the carburizing and quenching process of internal spline gears, the carburizing temperature, the quenching temperature, the quenching oil temperature and the quenching oil quality can be reasonably adjusted, so that the thermal stress and the tissue stress of a gear can be effectively reduced, the deformation of the gear is reduced, and the deformation regulation is adjusted.

Description

technical field [0001] The invention relates to a gear processing technology, in particular to a carburizing and quenching technology for an internal spline gear of a gearbox. Background technique [0002] The internal spline gear and the spline shaft parts with the same parameters are the most commonly used applications in the design and manufacture of gearboxes. This type of internal spline gear needs to be processed through nine steps, which are forging→normalizing→rough turning→finish turning→spline pulling→hobbing→carburizing and quenching→shot blasting→finished product storage. The carburizing and quenching process of the internal spline gear mainly includes the following steps: 1. Entering the furnace; 2. Intensive infiltration period, the carburizing temperature is between 920 and 930°C; 3. Diffusion period; 4. Cooling down; 5. Quenching out of the furnace , The quenching temperature is 840°C, using No. 20 engine oil, and the oil temperature is 100°C. Since the int...

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Problems solved by technology

However, the internal spline gear produced by the above-mentioned carburizing and quenching process has the following problems: 1. The quenching temperature in this step is too high, so that the structural stress and deformation of the gear become larger; 2. , due to the low temperature of the quenching oil, the internal fluidity of the quenching oil is low, resulting in uneven cooling of the product; 3, due to insufficient high-temperature cooling capacity of the quenching oil or too long vapor film stage of the oil, the hardened layer at the big end of the gear is insufficient , leading to uneven distribution of quenching stress, uneven cooling of parts, and severe deformation

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