A normalizing and tempering process for motor shaft forgings

A motor shaft and forging technology, which is applied in the field of normalizing and tempering of motor shaft forgings, can solve the problems of reducing the pace of power station construction, not improving economic benefits, and high production costs

Active Publication Date: 2021-05-11
陕西华威科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • 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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  • A normalizing and tempering process for motor shaft forgings
  • A normalizing and tempering process for motor shaft forgings

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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: Air-cool the motor shaft forging to 475±25°C after forging, then put the motor shaft forging into a heat treatment furnace at 200mm / h for heat preservation, to achieve the same internal and external temperature of the motor shaft forging, and complete the transformation of the pearlite structure. The radius of the motor shaft forging is 400mm, so the above heat preservation time is 2 hours. S003: The motor shaft forging is made of carbon-manganese steel...

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Abstract

The present invention proposes a normalizing and tempering process for motor shaft forgings, comprising the following steps: S001: using steel ingots that have been smelted in an electric arc furnace, refined outside the furnace, and vacuum degassed as raw materials; S002: air-cool the forgings to 475 After ±25°C, put it into the heat treatment furnace and keep it warm; S003: If the forging is carbon-manganese steel, go directly to the next step; if the forging is alloy steel, cool it to 320±20°C in the furnace, and then Heat up to 650±30°C from no more than 80°C and keep it warm; S004: Heat the forgings to 880±10°C at 100°C per hour in the heat treatment furnace and then equalize the temperature; S005: If the forgings are carbon-manganese steel, blow them out Cooling or water mist cooling to 320±20°C; if the forging is alloy steel, quench it and cool it to a surface temperature of about 100°C after it comes out of the furnace; S006: put the forging into the furnace at 80°C per hour and heat it up to 580±10°C, then keep it warm Then stop the furnace; S007: Cool the forging to below 300°C at a rate of no more than 100°C per hour, and then air-cool to room 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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Patent Type & Authority Patents(China)
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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