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Manufacturing method of blank of bearing steel rolling body for wind driven generator yawing pitch bearing

A technology for wind turbines and variable pitch bearings, which is applied in the field of production of bearing steel rolling element blanks for yaw and pitch variable bearings of wind turbines, and can solve problems such as reduced contact fatigue life, broken forging streamlines, and large spherical errors. Achieve the effects of improved impact toughness and contact fatigue life, improved stability against tempering, and improved consistency

Active Publication Date: 2017-05-10
CHANGSHU LONGTENG ROLLING ELEMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To ensure the consistency of steel ball performance, the uniformity of structure, the reliability and safety of use, the traditional rolling body blanking process cannot meet the requirements
[0003] The steel balls used in yaw and pitch bearings are large steel balls with a diameter of 40 to 82.55 mm. The traditional billet making process has the following disadvantages: 1. Forging with an air hammer has large spherical errors, deep decarburization layers, and final forging. The temperature is not easy to control, the inner structure is uneven, the labor intensity of the workers is high, and the production efficiency is low; 2. Stamping with a punch, there is a process of cutting the ring belt, the material loss is large, the radial forging streamline is damaged, and the contact fatigue life is reduced; 3. Hot-rolling process. Although the billet produced by the hot-rolling process has no ring belt, the forging streamline is reasonable, and the production efficiency is also high, there is a Mannesmann effect in this process. If the control is not good, the core of the billet is prone to occur. Microcracks or loose structure, so steel balls that require high reliability in applications are not recommended to be billeted by hot rolling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment provides a method for manufacturing a bearing steel rolling element blank for a wind turbine yaw pitch bearing, which includes the following steps:

[0018] (a) Place the qualified bearing steel bars on the material rack. After unbundling, the mechanical, electrical and pneumatic devices will realize automatic material turning, distribution and feeding, and the material will be sent to the intermediate frequency heating furnace for heating. After the temperature reaches 1000°C Enter the HF-600-3.5 high-speed hot heading machine online for upsetting and forming (forging speed can reach 90-110 pieces / minute, and the hot heading machine can simultaneously realize material cutting, upsetting and forming, which can improve the utilization of materials rate, increased by 3 to 5%); the obtained product basically has no flash, and the process of cutting the ring belt is removed, which not only saves raw materials, but also reduces the damage to the forging flow l...

Embodiment 2

[0023] This embodiment provides a method for manufacturing a bearing steel rolling element blank for yaw and pitch bearings of wind power generators, which is basically the same as the steps in Embodiment 1, except that the specific heating and annealing temperatures are inconsistent, specifically: In step (a), after the temperature reaches 1150°C, enter the HF-600-3.5 high-speed hot heading machine online for upsetting and forming; in step (b), cool the formed product to 700°C with liquid medium, and continue cooling by air blast to 350°C; followed by stack cooling; in step (c), first the natural gas is heated to 500°C, and then heated to 810°C in an electrically heated furnace for 4 hours; (d) the product obtained in step (c) is rapidly cooled (50°C / h) to 730°C for isothermal spheroidization, after 5 hours of heat preservation, cool down to below 620°C at a rate of ≤25°C / h, and take out the furnace for air cooling.

Embodiment 3

[0025] This embodiment provides a method for manufacturing a bearing steel rolling element blank for yaw and pitch bearings of wind power generators, which is basically the same as the steps in Embodiment 1, except that the specific heating and annealing temperatures are inconsistent, specifically: In step (a), after the temperature reaches 1100°C, enter the HF-600-3.5 high-speed hot heading machine online for upsetting and forming; in step (b), cool the formed product to 600°C with liquid medium, and continue cooling by air blast to 300°C; followed by stack cooling; in step (c), first the natural gas is heated to 480°C, and then heated to 800°C in an electrically heated furnace for 4 hours; (d) the product obtained in step (c) is rapidly cooled (80°C / h) to 700°C for isothermal spheroidization, after 10 hours of heat preservation, cool down to below 620°C at a rate of ≤25°C / h, and then take out the furnace and air cool.

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PUM

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Abstract

The invention discloses a manufacturing method of a blank of a bearing steel rolling body for a wind driven generator yawing pitch bearing. The manufacturing method comprises the following steps that (a), a bearing steel bar are heated to 1000-1150 DEG C and fed into a hot header to be cut, upset and molded; (b), a molded product is cooled to 550-700 DEG C with a liquid medium, after the molded product is taken out of the liquid medium, the molded product continues to be subjected to blast cooling to 200-350 DEG C, and then stack cooling is conducted; (c), a product obtained in the step (b) is moved into a balling annealing furnace; and (d), a product obtained in the step (c) is cooled to 690-730 DEG C and subjected to isothermal balling, after heat preservation is conducted for 5-10 h, the product is cooled to under 620 DEG C at the speed of 25 DEG C / h or below, and the product is fetched out of the furnace and cooled in the air. The tempering resisting stability of the product is improved, impact toughness is greatly improved, and the contact fatigue life is greatly prolonged; and the level of network carbides can be controlled under the second level.

Description

technical field [0001] The invention relates to a method for manufacturing a rolling element blank, in particular to a method for manufacturing a bearing steel rolling element blank for a yaw variable pitch bearing of a wind power generator. Background technique [0002] Wind power is a renewable clean energy, and the country is gradually increasing the proportion of clean energy in total energy consumption. According to relevant data, the annual installed capacity in the world is about 30GW. At present, the power of commonly used wind turbines is 1.0-6MW, which are divided into two types: onshore and offshore wind turbines. The design life is maintenance-free within 20 years. Among them, the yaw bearing and the pitch bearing are the key components in the wind turbine. They work under harsh working conditions and must bear a large overturning moment, and the rolling elements in the bearings-steel balls are the key. To ensure the consistency of steel ball performance, the un...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D1/74C21D8/06
CPCC21D1/32C21D1/74C21D8/065
Inventor 任志刚徐胜徐祥龙柳春辉
Owner CHANGSHU LONGTENG ROLLING ELEMENT CO LTD
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