Preprocessing technology for processing integral key shaft

Abstract

The invention realtes to a preprocessing technology for processing integral key shaft, accomplished by the following steps: induction annealing area of integral key shaft using electromagnetic induction to be heated to above A[C3] over 50-80 degree for incubation of 1-2 hours, namely slowly cooling to 300 degree in asbestos drum and then air colling to narmal temperature. The surface hardness can be greatly decreased by surface induction annealing treatment, at the same time the uniformity of hardness is increased and the grain can be refined (grain size 8), and the uniformity of structure can be advanced, therefore the processability of integral key shaft can be greatly improved, the process quality thereof can be advanced, the tool life is increased by more than 5 times, the processing cost is saved, and the production effciency and economy benefit can also be obviously generated. Compared with modulator procedure, the said technology saves proscessing cost and greatly increases production timeefficiency.

Description

technical field

[0001] The invention relates to a heat treatment process of a spline shaft, mainly a processing pretreatment process of a spline shaft. Background technique

[0002] The transmission shaft assembly is composed of multiple parts, among which the spline shaft is one of the most important and commonly used transmission parts, which requires a certain strength and hardness. In order to ensure the strength of the spline shaft, the blank generally needs to be subjected to overall quenching and tempering heat treatment (most spline shafts need to be subjected to surface quenching after processing), and the hardness after quenching and tempering is generally required to be between HB241-302. After quenching and tempering the blank parts of the spline shaft, because of the high hardness of the blank after quenching and tempering, the hardness is uneven, the matrix grain structure is not ideal, and the hardness of the parts is also relativ...

Examples

Embodiment 1

[0009] Embodiment 1: The pretreatment process of the spline shaft of the present invention adopts the surface induction annealing process, the blank of the spline shaft 1 adopts the American standard SAE1045 steel, and the equipment adopts the intermediate frequency quenching machine GK1080A, and the specific process is: the intermediate frequency quenching machine is set The fixed power is 80-90 kilowatts, set 10-15 Hz on the inverter, and set the moving distance of the blank. During induction annealing, the induction annealing area 1-1 of the general spline shaft (that is, the spline processing part) is as follows: figure 1 shown. The surface part of the blank to be splined is heated by induction above A C3 (Generally between 700-720°C) above 60°C. At this time, the transformation ratio is 12:1, the operating power of the equipment is 80-90KW, the induction coil moves from top to bottom in the front section of induction annealing area 1-1, and the moving speed is 5HZ, and t...

Embodiment 2

[0011] Embodiment 2: The spline shaft processing pretreatment process of the present invention adopts the surface induction annealing process, and the blank of the spline shaft adopts No. 45 steel of the national standard. higher than A C3 Above 50°C temperature, the power of the equipment is 80-90KW. In the front section of the induction annealing area 1-1, the induction coil moves from top to bottom with a moving speed of 5HZ and a moving speed of 4.5HZ in the last 15mm. Keep warm for 1 hour; that is, slowly cool in the asbestos cylinder to about 300°C, and then air cool to normal temperature.

Embodiment 3

[0012] Embodiment 3: The spline shaft processing pretreatment process of the present invention adopts the surface induction annealing process, and the blank of the spline shaft adopts No. 45 steel of the national standard. higher than A C3 The temperature above 80°C, the operating power of the equipment is 80-90KW, the front section of the induction annealing area 1-1, the induction coil moves from top to bottom, the moving speed is 5HZ, and the moving speed is 4.5HZ in the last 20mm; heat preservation for 2 hours, That is, it is slowly cooled to about 300°C in the asbestos cylinder, and then air-cooled to normal temperature.

technical field

[0001] The invention relates to a heat treatment process of a spline shaft, mainly a processing pretreatment process of a spline shaft. Background technique

[0002] The transmission shaft assembly is composed of multiple parts, among which the spline shaft is one of the most important and commonly used transmission parts, which requires a certain strength and hardness. In order to ensure the strength of the spline shaft, the blank generally needs to be subjected to overall quenching and tempering heat treatment (most spline shafts need to be subjected to surface quenching after processing), and the hardness after quenching and tempering is generally required to be between HB241-302. After quenching and tempering the blank parts of the spline shaft, because of the high hardness of the blank after quenching and tempering, the hardness is uneven, the matrix grain structure is not ideal, and the hardness of the parts is also relativ...

Examples

Embodiment 1

[0009] Embodiment 1: The pretreatment process of the spline shaft of the present invention adopts the surface induction annealing process, the blank of the spline shaft 1 adopts the American standard SAE1045 steel, and the equipment adopts the intermediate frequency quenching machine GK1080A, and the specific process is: the intermediate frequency quenching machine is set The fixed power is 80-90 kilowatts, set 10-15 Hz on the inverter, and set the moving distance of the blank. During induction annealing, the induction annealing area 1-1 of the general spline shaft (that is, the spline processing part) is as follows: figure 1 shown. The surface part of the blank to be splined is heated by induction above A C3 (Generally between 700-720°C) above 60°C. At this time, the transformation ratio is 12:1, the operating power of the equipment is 80-90KW, the induction coil moves from top to bottom in the front section of induction annealing area 1-1, and the moving speed is 5HZ, and t...

Embodiment 2

[0011] Embodiment 2: The spline shaft processing pretreatment process of the present invention adopts the surface induction annealing process, and the blank of the spline shaft adopts No. 45 steel of the national standard. higher than A C3 Above 50°C temperature, the power of the equipment is 80-90KW. In the front section of the induction annealing area 1-1, the induction coil moves from top to bottom with a moving speed of 5HZ and a moving speed of 4.5HZ in the last 15mm. Keep warm for 1 hour; that is, slowly cool in the asbestos cylinder to about 300°C, and then air cool to normal temperature.

Embodiment 3

[0012] Embodiment 3: The spline shaft processing pretreatment process of the present invention adopts the surface induction annealing process, and the blank of the spline shaft adopts No. 45 steel of the national standard. higher than A C3 The temperature above 80°C, the operating power of the equipment is 80-90KW, the front section of the induction annealing area 1-1, the induction coil moves from top to bottom, the moving speed is 5HZ, and the moving speed is 4.5HZ in the last 20mm; heat preservation for 2 hours, That is, it is slowly cooled to about 300°C in the asbestos cylinder, and then air-cooled to normal temperature.

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