High-speed tool steel circular saw blade heat treatment process capable of preventing quenching deformation

Abstract

The invention provides a high-speed tool steel circular saw blade heat treatment process capable of preventing quenching deformation, and relates to the technical field of circular saw blade heat treatment. The process comprises the following steps: S1, annealing: preheating to 260-380 DEG C, then heating to 860-900 DEG C, preserving heat, and quickly cooling to 720-740 DEG C for isothermal treatment; s2, quenching is conducted, specifically, the power of laser quenching treatment is 700-800 watts, the laser scanning speed is 10-20 m / min, and the light spot width is 4-7 mm; and S3, tempering is conducted, specifically, the tempering temperature of 550-570 DEG C is adopted, the tempering heat preservation time is 1-3 h, the tempering frequency is 2-3 times, and after tempering is conducted every time, after the saw blade base body needs to be cooled to the room temperature, the next time of tempering is conducted. The laser light absorption coating is arranged on the surface of the saw blade base body in advance, laser quenching treatment is carried out, the surface roughness is improved, quenching deformation and cracking are avoided, and the saw blade base body has the advantages of being fine, high in hardenability, free of deformation and cracking and the like.

Description

technical field

[0001] The invention relates to the technical field of circular saw blade heat treatment, in particular to a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation. Background technique

[0002] High-speed tool steel contains a large amount of alloying elements such as tungsten, molybdenum, chromium, vanadium, etc. When heated and dissolved into austenite, the maximum solid solubility point E of carbon in γ-Fe is significantly shifted to the left, so high-speed tool steel cast The ledeburite structure appears in the as-cast structure, which belongs to ledeburite steel. The eutectic carbides in the as-cast structure of high-speed tool steel are distributed in the shape of fish bones. The eutectic carbides in the shape of fish bones are hard and brittle, and cannot be removed by heat treatment. , it must be crushed and redistributed by high-temperature rolling and forging. High-speed tool steel without forging will ...

Examples

Embodiment 1

[0024] An embodiment of the present invention provides a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation, which includes the following steps:

[0025] S1. Annealing: After the saw blade is pretreated to obtain the saw blade matrix, use isothermal spheroidization annealing, first preheat to 260°C, then heat to 860°C for heat preservation, quickly cool to 720°C isothermal, and take out the furnace below 500°C, and cool to At room temperature, the structure after annealing is sorbite and granular carbide, with a hardness of 207-255HBW; because the austenite stability of high-speed tool steel is very good, martensite structure will also appear after forging, with high hardness, eliminating Forging stress, reducing hardness, improving machinability, and preparing tissue for quenching;

[0026] S2. Quenching: The surface of the saw blade substrate is evenly coated with a laser light-absorbing coating, dried, and subjected to laser...

Embodiment 2

[0040] An embodiment of the present invention provides a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation, which includes the following steps:

[0041] S1. Annealing: After the saw blade is pretreated, the saw blade substrate is obtained. Using isothermal spheroidization annealing, first preheat to 370°C, then heat to 870°C and keep it warm, and cool down to 720°C at a rate of 20°C / h. ℃ for 2 hours, cooled to 480 ℃ in the furnace, cooled to room temperature, and annealed to release the stress; because the austenite stability of high-speed tool steel is very good, martensitic structure will appear after forging, and the hardness is higher, eliminating forging Stress, reduce hardness, improve machinability, and prepare tissue for quenching;

[0042] S2. Quenching: The surface is evenly coated with a laser light-absorbing coating, dried, and subjected to laser quenching treatment. The power of the laser quenching treatment is 75...

technical field

[0001] The invention relates to the technical field of circular saw blade heat treatment, in particular to a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation. Background technique

[0002] High-speed tool steel contains a large amount of alloying elements such as tungsten, molybdenum, chromium, vanadium, etc. When heated and dissolved into austenite, the maximum solid solubility point E of carbon in γ-Fe is significantly shifted to the left, so high-speed tool steel cast The ledeburite structure appears in the as-cast structure, which belongs to ledeburite steel. The eutectic carbides in the as-cast structure of high-speed tool steel are distributed in the shape of fish bones. The eutectic carbides in the shape of fish bones are hard and brittle, and cannot be removed by heat treatment. , it must be crushed and redistributed by high-temperature rolling and forging. High-speed tool steel without forging will ...

Examples

Embodiment 1

[0024] An embodiment of the present invention provides a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation, which includes the following steps:

[0025] S1. Annealing: After the saw blade is pretreated to obtain the saw blade matrix, use isothermal spheroidization annealing, first preheat to 260°C, then heat to 860°C for heat preservation, quickly cool to 720°C isothermal, and take out the furnace below 500°C, and cool to At room temperature, the structure after annealing is sorbite and granular carbide, with a hardness of 207-255HBW; because the austenite stability of high-speed tool steel is very good, martensite structure will also appear after forging, with high hardness, eliminating Forging stress, reducing hardness, improving machinability, and preparing tissue for quenching;

[0026] S2. Quenching: The surface of the saw blade substrate is evenly coated with a laser light-absorbing coating, dried, and subjected to laser...

Embodiment 2

[0040] An embodiment of the present invention provides a high-speed tool steel circular saw blade heat treatment process for preventing quenching deformation, which includes the following steps:

[0041] S1. Annealing: After the saw blade is pretreated, the saw blade substrate is obtained. Using isothermal spheroidization annealing, first preheat to 370°C, then heat to 870°C and keep it warm, and cool down to 720°C at a rate of 20°C / h. ℃ for 2 hours, cooled to 480 ℃ in the furnace, cooled to room temperature, and annealed to release the stress; because the austenite stability of high-speed tool steel is very good, martensitic structure will appear after forging, and the hardness is higher, eliminating forging Stress, reduce hardness, improve machinability, and prepare tissue for quenching;

[0042] S2. Quenching: The surface is evenly coated with a laser light-absorbing coating, dried, and subjected to laser quenching treatment. The power of the laser quenching treatment is 75...