Half axle gear inner spline carburizing and quenching method and carburizing and quenching equipment

Abstract

The invention discloses a half axle gear inner spline carburizing and quenching method and carburizing and quenching equipment. The half axle gear inner spline carburizing and quenching method comprises the steps that a half axle gear is in cup joint with a compensation sleeve and is placed in an interior low-pressure quenching furnace, then, the inner spline is heated to 900 DEG C, the position of the inner spline is inflated with dimethylmethane, and the process is continuously conducted for 240 min; then, the temperature of the inner spline is reduced to 840 DEG C, and continuous inflationof the dimethylmethane is conducted for 45 min; heating and inflation of the dimethylmethane are stopped, inflation of high-pressure and high-purity nitrogen is conducted instead, the process is continuously conducted for 20 min, and finally the half axle gear is taken out of the quenching furnace and cooled to the room temperature; the carburizing and quenching equipment comprises the quenching furnace, a hollow containing column is arranged in the quenching furnace, and the bottom of the quenching furnace is connected with an air suction pipe; the side face of the containing column is connected with a first branch pipe and a second branch pipe through an air inlet pipe in the tangential direction; and the top end of the quenching furnace is connected with a telescopic cylinder, and a resistance type heating coil is fixed to the bottom of the telescopic cylinder through a motor. By means of the half axle gear inner spline carburizing and quenching method and the carburizing and quenching equipment, the carburization effect at the inner spline position can be improved, and the advantage of small inner spline deformation is achieved.

Description

technical field [0001] The invention relates to a method for carburizing and quenching an internal spline of a gear and its quenching equipment, in particular to a method for carburizing and quenching an internal spline of a side shaft gear and its quenching equipment. Background technique [0002] At present, the common gear quenching in the market is to put the gear into the internal high-temperature quenching furnace, and pass gas such as methane and propane into the quenching furnace, so that the surface of the gear is carburized, and then the carburized gear is directly Immerse in quenching oil for cooling and quenching, so that the surface of the gear has good wear resistance and hardness, while the inside of the gear still maintains toughness; but for the side shaft gear with internal splines, use this kind of device for quenching, directly The furnace is filled with gas such as methane, and the gas is not easy to reach the position of the inner spline, so that the ca...

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Problems solved by technology

[0002] At present, the common gear quenching in the market is to put the gear into the internal high-temperature quenching furnace, and pass gas such as methane and propane into the quenching furnace, so that the surface of the gear is carburized, and then the carburized gear is directly Immerse in quenching oil for cooling and quenching, so that the surface of the gear has good wear resistance and hardness, while the inside of the gear still maintains toughness; but for the side shaft gear with internal splines, use this kind of device for quenching, directly The furnace is filled with gas such as methane, and the gas is not easy to reach the position of the inner spline, so that the carburizing effect at the position of the inner spline is poor; and the temperature at one end of the heating position in the quenching furnace is relatively high, and the internal temperature distribution is uneven. The overall heating effect of the internal spline is uneven, and the internal spline will be greatly deformed after quenching; at the same time, the thickness of the two ends of the half shaft gear is uneven, and the deformation degree of the two ends of the internal spline is different during quenching. Splines prone to large twists

Therefore, the existing carburizing and quenching methods and equipment for side gears have the problems of poor carburizing effect at the position of the internal spline and large deformation of the internal spline

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