A heat treatment process for reducing the deformation of the gear shaft keyway

Abstract

The invention discloses a heat treatment process of reducing key slot deformation of a small gear shaft, and belongs to the technical field of heat treatment. The heat treatment process comprises the steps of: 1) machining of a gear shaft part; 2) framing; 3) precleaning; 4) coating of carburization preventing paint at a key slot part of the gear shaft part; 5) carburizing and quenching: temperature homogenization of 830+-5 DEG C by 20+-1 min, and carbon potential of 0.60+-0.025%; strong seepage of 900+-5 DEG C by 60+-1 min, and carbon potential of 0.95+-0.025%; dispersion of 880+-5 DEG C by 40+-1 min, and carbon potential of 0.80+-0.025%; quenching temperature homogenization of 830+-5 DEG C by 35+-1 min, and carbon potential of 0.65+-0.025%; and cooling in quenching oil of 140+-5 DEG C; 6) after cleaning; 7) tempering; and 8) recleaning. The heat treatment method effectively reduces deformation of the key slot of the gear shaft after heat treatment, and can reach 100% of once pass percent of heat treatment.

Description

technical field [0001] The invention relates to a heat treatment process, and more specifically relates to a heat treatment process for reducing deformation of a keyway of a gear shaft, which is mainly used in a shoulder reducer of an industrial robot. Background technique [0002] figure 1 and figure 2 It is a structural schematic diagram of an input gear shaft for an industrial robot shoulder reducer. The gear shaft 1 has teeth 2 at one end and a keyway 3 at the other end. The robot shoulder reducer is the load-bearing part, its main function is to transmit power, it is the main part connecting the servo motor and the reducer, and the input gear shaft is an important part in the shoulder reducer system, the working conditions are complex, the gear shaft is required to have Excellent wear resistance, high resistance to contact fatigue and bending fatigue properties, these properties usually need to be achieved by heat treatment. At present, for the heat treatment of thi...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing heat treatment process of the input gear shaft, such as large deformation of the keyway of the gear shaft and low yield, and provide a heat treatment process for reducing the deformation of the keyway of the gear shaft. Technical measures such as fire technology, furnace loading method, carburizing and quenching process, control of carburizing and carburizing potential, and coating of gear shaft key grooves have effectively controlled the heat treatment distortion of gear shaft key grooves and reduced the deformation of gear shaft key grooves after heat treatment. At the same time, the wear resistance, contact fatigue resistance and bending fatigue resistance of the gear shaft are improved. It is a heat treatment process with a pass rate of 100% in one heat treatment.

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