Layer-by-layer heating for cylindrical helical gears

Abstract

The invention relates to a layer-by-layer heating device for cylindrical bevel gears. The device comprises a heating device, a rotating platform device, a worktable, a lifting device, a vertical powersupply table, a base and multiple infrared temperature measuring cameras; the heating device comprises a profiling induction coil and an induction coil bracket; one end of the induction coil bracketis vertically fixed on the vertical power supply table; the profiling induction coil is fixed at the other end of the induction coil bracket; the profiling induction coil is positioned above the rotating platform device; the rotating platform device is used for fixedly supporting the cylindrical bevel gears; the rotating platform device is mounted on the worktable; the worktable is mounted on thelifting device; the lifting device is fixed on the base; and the vertical power supply table is vertically fixed on the base. The invention further provides a layer-by-layer heating method for the cylindrical bevel gears; the influence caused by the end surface effect is effectively reduced; the depth uniformity of tooth surface hardening layers is improved; and the service life of the cylindricalbevel gears is prolonged.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a layer-by-layer heating device for cylindrical helical gears and a method thereof. Background technique [0002] Induction hardening is one of the important processes of heat treatment. It uses induction current to quench the surface of the workpiece. After heating and cooling, the surface obtains a martensitic structure with high hardness, while the internal structure still has good toughness, plasticity and high hardness. Strength, etc., to meet the high service life of parts under alternating loads. Induction hardening is especially popular for its advantages of high production efficiency, low energy consumption, low pollution and easy automation. In the strengthening method of gears, it constitutes four basic processes together with quenching and tempering, carburizing and nitriding. With the development of industrial technology, the parameters of various...

AI Technical Summary

Problems solved by technology

In the prior art, when the cylindrical helical gear is heated by induction, the magnetic field generated by the traditional circular induction coil cannot be kept perpendicular to the tooth surface of the cylindrical helical gear, and the tooth surface is heated unevenly, and the tooth top is prone to overheating and the tooth groove is not. In the case of hardened layers, the resulting cylindrical helical gear tooth flanks often have defects, which reduce the quality and service life of the gear

In addition, due to the end face effect, during the movement of the circular induction coil, the cylindrical helical gear is affected by the comprehensive electromagnetic effect at the inlet and outlet positions of the induction coil, and it is easy to generate a large temperature difference on the tooth profile, resulting in uneven quenching hardness of the tooth surface The phenomenon, that is, the appearance of soft and hard points

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