Steel ball special for large-sized offshore wind turbine generator bearing and manufacturing process of steel ball

Abstract

The invention relates to a steel ball special for a bearing of a large-scale offshore wind power generator group and a manufacturing process for the steel ball. The circularity of the steel ball is 0.4 to 0.8 mu m, the hardness of the steel ball is 59 to 64 HRC, the single-grain hardness grain difference is 0.8 HRC, the batch hardness difference of the steel ball is 1.2 HRC, the core part hardness of the steel ball is greater than 54 HRC, the retained austenite of the steel ball accounts for 8 to 13 percent, the metallographic structure of the steel ball is of 2 to 3 level, the surface roughness of the steel ball is greater than 0.8 mu m, and the crushing load and the compression ratio of the steel ball are 1.2 times greater than a national standard. By combining a plurality of types of technologies of selecting raw materials, adopting hot extrusion continuous molding during ball blank molding, performing multistage quenching by adopting a water-soluble quenching agent during heat treatment, increasing a secondary stable tempering technology and increasing eddy flow nondestructive flaw detection during a process flow and the like, the steel ball has the characteristics of high contact fatigue strength, high abrasion resistance, high elastic limit, appropriate hardness, high impact ductility, high dimensional stability and the like.

Description

technical field

[0001] The present invention relates to a special steel ball for a large-scale offshore wind turbine bearing, and also relates to a manufacturing process for realizing the above-mentioned special steel ball for a large-scale offshore wind turbine bearing. Background technique

[0002] Due to its environmental protection, wind power generation has been highly valued by various countries in the world in recent years, and the situation of wind power industry has developed quite rapidly. my country's wind power market needs about 30 million special steel balls for wind power bearings, and the international market needs about 1.5 billion. Therefore, special steel balls for wind power generation have broad market prospects. Steel ball bearings on wind turbines generally include: yaw bearings, pitch bearings, and generator bearings. For example, the horizontal axis wind turbine must yaw to achieve facing the wind. The yaw bearing is an important part of the yaw sy...

Examples

Embodiment Construction

[0017] The manufacturing process of the special steel ball for the large-scale offshore wind turbine bearing in the present invention mainly includes the following steps: a. raw material selection; b. molding; c. spheroidizing annealing; d. smooth grinding; e. heat treatment; f. Secondary tempering; h. Primary grinding; i. Polishing; j. Eddy current flaw detection; k. Two grindings; l. Cleaning; m. Inspection; n. Oiled packaging.

[0018] a. Selection of raw materials: Firstly, the selection of raw materials is carried out. Steel balls for offshore wind turbine bearings are important components of bearings. The quality of steel balls is crucial to the accuracy, dynamic performance and service life of ball bearings. A large number of bearings are used , the test shows that steel balls affect 70% of all factors of the bearing, and the proportion of bearing failure due to steel ball rupture accounts for 58.8%, which shows the important position and importance of steel balls in bea...

technical field

[0001] The present invention relates to a special steel ball for a large-scale offshore wind turbine bearing, and also relates to a manufacturing process for realizing the above-mentioned special steel ball for a large-scale offshore wind turbine bearing. Background technique

[0002] Due to its environmental protection, wind power generation has been highly valued by various countries in the world in recent years, and the situation of wind power industry has developed quite rapidly. my country's wind power market needs about 30 million special steel balls for wind power bearings, and the international market needs about 1.5 billion. Therefore, special steel balls for wind power generation have broad market prospects. Steel ball bearings on wind turbines generally include: yaw bearings, pitch bearings, and generator bearings. For example, the horizontal axis wind turbine must yaw to achieve facing the wind. The yaw bearing is an important part of the yaw sy...

Examples

Embodiment Construction

[0017] The manufacturing process of the special steel ball for the large-scale offshore wind turbine bearing in the present invention mainly includes the following steps: a. raw material selection; b. molding; c. spheroidizing annealing; d. smooth grinding; e. heat treatment; f. Secondary tempering; h. Primary grinding; i. Polishing; j. Eddy current flaw detection; k. Two grindings; l. Cleaning; m. Inspection; n. Oiled packaging.

[0018] a. Selection of raw materials: Firstly, the selection of raw materials is carried out. Steel balls for offshore wind turbine bearings are important components of bearings. The quality of steel balls is crucial to the accuracy, dynamic performance and service life of ball bearings. A large number of bearings are used , the test shows that steel balls affect 70% of all factors of the bearing, and the proportion of bearing failure due to steel ball rupture accounts for 58.8%, which shows the important position and importance of steel balls in bea...