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Motor shaft forging normalizing and tempering process

A technology for motor shafts and forgings, which is applied in the field of normalizing and tempering technology for motor shaft forgings, which can solve the problems of reducing the pace of power station construction, long construction period, and lack of economic benefits, so as to shorten heat treatment time and improve production efficiency effect

Active Publication Date: 2019-10-08
陕西华威科技股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Its long construction period reduces the pace of power station construction, economic benefits cannot be improved, and production costs are high

Method used

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  • Motor shaft forging normalizing and tempering process

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Embodiment Construction

[0021] refer to figure 1 According to the normalizing and tempering process of motor shaft forgings of the present invention, the motor shaft forgings with a radius of 400mm are normalized and tempered. S001: Use carbon-manganese steel ingots smelted by electric arc furnace, refined outside the furnace, and smelted by vacuum degassing as raw materials for motor shaft forgings. During the above refining and smelting process, ensure that in the motor shaft forgings: S≤0.020%, P≤0.015 %, H≤2ppm, O≤30ppm, N≤65ppm, Cu≤0.20%. S002: After the motor shaft forging is fully austenitized, it is cooled to 320±20°C by air cooling or water mist, and then the motor shaft forging is placed in a heat treatment furnace for heat preservation at 200mm / h to reach the internal and external temperature of the motor shaft forging Consistent, the transformation of pearlite structure is completed. Since the radius of the motor shaft forging is 400mm, the above holding time is 2 hours. S003: The motor...

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Abstract

The invention provides a motor shaft forging normalizing and tempering process. The motor shaft forging normalizing and tempering process comprises the following steps of 1, adopting steel ingot whichis subjected to electric arc furnace smelting, external refining and vacuum degassing smelting as raw materials; 2, after forging, carrying out air cooling on a forged piece to 475DEG C+ / -25DEG C, and then loading the forged piece into a heat-treating furnace for temperature preserving; 3, if the forged piece is made of carbon manganese steel, directly entering the next step; if the forged pieceis made of alloy steel, carrying out furnace cooling to 320 DEG C+ / -20 DEG C, and then heating the forged piece to 650 DEG C+ / -30 DEG C at the temperature of no more than 80 DEG C per hour and then carrying out temperature preserving; 4, heating the forged piece in the heat-treating furnace to 880 DEG C+ / -10 DEG C at the temperature of 100 DEG C per hour and then carrying out uniform temperature;5, if the forged piece is made of the carbon manganese steel, after tapping, carrying out air cooling or water spray cooling to 320 DEG C + / -20 DEG C; if the forged piece is made of the alloy steel, after tapping, carrying out water quenching and cooling to the surface temperature of about 100 DEG C; 6, putting the forged piece into the furnace and heating to 580 DEG C + / -10 DEG C at the temperature of 80 DEG C per hour, and then carrying out heat preserving and closing the furnace; and 7, cooling the forged piece to 300 DEG C or below at the temperature of no greater than 100 DEG C per hour,and after tapping, carrying out air cooling to normal temperature.

Description

technical field [0001] The invention belongs to the field of normalizing and tempering heat treatment of forging blanks, in particular to a normalizing and tempering process for a motor shaft forging. Background technique [0002] At present, the development of equipped motor shafts in the field of wind power generation is very rapid, and the construction of generator sets in power plants is also increasing. In the manufacturing process of large generator sets, the quality of the motor shaft largely determines the stability and safety of the generator set operation. The existing motor shaft forging heat treatment methods are forging, rough turning, flaw detection, quenching and tempering, and processing delivery dimensions. Its long construction period reduces the pace of power station construction, economic benefits cannot be raised, and production costs are high. The ever-increasing demand for large generator shafts places higher demands on the production and manufacturi...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/28C21D9/28C22C38/16
CPCC21D1/18C21D1/28C21D9/28C22C38/001C22C38/002C22C38/16
Inventor 王佳星梁曼娟
Owner 陕西华威科技股份有限公司
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