Heat treatment process for water pump shaft connecting bearings

Abstract

The invention relates to a heat treatment process for water pump shaft connecting bearings, which includes a quenching and tempering treatment and an intermediate-frequency inductive heat treatment, wherein, the quenching and tempering treatment comprises the steps that an inner shaft of a water pump shaft connecting bearing is positioned in a resistance furnace to have integral heat treatment at a heating temperature being 820 DEG C to 830 DEG C; then oil quenching is performed; and the water pump shaft connecting bearing after oil quenching is tempered at a temperature as high as 480 DEG C to 520 DEG C, kept for 2 hours, and then cooled quickly. The intermediate-frequency inductive heat treatment includes the following steps that the surface heat treatment of the inner shaft of the water pump shaft connecting bearing is performed after the quenching and tempering treatment is performed, the heating temperature is 880 DEG C to 900 DEG C, then water-quenched quenching is performed, the inner shaft of the water pump shaft connecting bearing is heated up to 160 DEG C to 180 DEG C and cooled at a normal temperature, the intermediate-frequency induction heating is performed at a high speed, austenite grains are difficult to grow, the martensite structure after quenching is also extremely tiny, the surface hardness is high, fine-granular carbide is distributed on the matrix of a rope prime body after the quenching and tempering treatment in a dispersion manner, and the hardness of the core thereof is HRC35-45; therefore, the strength and the toughness are good.

Description

technical field [0001] The invention relates to a heat treatment process for components, in particular to a heat treatment process for a shaft-connected bearing of a water pump. Background technique [0002] During the production process of Perkins water pump shaft-connected bearings, the parts of the bearing need to be heat treated. The usual heat treatment process is to carry out the overall heat treatment of the parts of the bearing. The hardness of the workpiece after treatment is HRC60~66. This overall heat treatment After the water pump shaft-connected bearing of the craft is installed on the Perkins water pump, in actual operation, the inner shaft of the water pump shaft-connected bearing is prone to breakage. The main reason for its main fracture is that the inner shaft of the shaft-connected bearing currently used in China has only a relatively high surface hardness, and the core does not have sufficient strength. It is easy to produce excessive plastic deformation ...

AI Technical Summary

Problems solved by technology

[0002] During the production process of Perkins water pump shaft-connected bearings, the parts of the bearing need to be heat treated. The usual heat treatment process is to carry out the overall heat treatment of the parts of the bearing. The hardness of the workpiece after treatment is HRC60~66. This overall heat treatment After the shaft-connected bearing of the water pump of the craft is installed on the Perkins water pump, in actual operation, the inner shaft of the shaft-connected bearing of the water pump is prone to breakage

The main reason for its main fracture is that the inner shaft of the shaft-connected bearing currently used in China has only a relatively high surface hardness, and the core does not have sufficient strength. It is easy to produce excessive plastic deformation under high load, which will damage the running accuracy of the bearing. , in severe cases, it will cause cracks on the surface until the inner shaft breaks