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
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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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