A carburizing and quenching method and carburizing and quenching equipment for internal splines of a side shaft gear

Abstract

The invention discloses a carburizing and quenching method and carburizing and quenching equipment for internal splines of a side shaft gear. Heat to 900°C, and feed propane at the position of the inner spline for 240 minutes; then lower the temperature of the inner spline to 840°C, and continue feeding propane for 45 minutes; stop heating and feed propane, and switch to Inject high-pressure high-purity nitrogen for 20 minutes, and finally take out the half-shaft gear from the quenching furnace to cool to room temperature; the equipment includes a quenching furnace, which is equipped with a hollow placement column, and the bottom of the quenching furnace is connected to an exhaust pipe; the side of the placement column The first branch pipe and the second branch pipe are connected through the air intake pipe in the tangential direction; the top of the quenching furnace is connected with a telescopic cylinder, and the bottom end of the telescopic cylinder is fixed with a resistance heating coil through a motor. The invention not only can improve the carburizing effect at the position of the inner spline, but also has the advantage of less deformation of the inner spline.

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 to the quenching The furnace is filled with gas such as methane, and the gas is not easy to reach the position of the inner splin...

AI Technical Summary

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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