Production method for dedicated steel ball for bearing of high-speed high-precision numerical control machine tool

Abstract

The invention discloses a production method for a dedicated steel ball for a bearing of a high-speed high-precision numerical control machine tool. The method comprises the following steps of steel ball cold heading, namely machining blank by sleeve cutting, shaping, cold heading multi-station and high-speed cold heading ways; rough machining by adopting a macrocyclic light bulb technology; performing controllable atmosphere quenching, cold treatment and tapering treatment by adopting a continuous drum furnace, automatically controlling carbon potential; surface strengthening by adopting a frequency conversion speed adjusting multi-beating-plate structure; hard grinding by adopting a ceramic sand wheel to perform macrocyclic process to machine; after primary grinding, adopting double-roller sorting; after fine grinding, performing photoelectric eddy current test; performing ultra-fine grinding machining after aging treatment; and performing photoelectric detection after ultra-fine grinding. The diameter variation of the steel ball which is machined and produced by the method provided by the invention is less than 0.07 micron, the roundness is less than 0.05 micron, the spherical error is less than 0.05 micron, the surface roughness Ra is less than 0.07 micron, the variation of the diameter of the ball lot is less than 0.09 micron, and the bearing dmn value of the steel ball after being sleeved is more than 2.5*10<6> mm*r / min.

Description

technical field [0001] The invention relates to a production method of steel balls, in particular to a production method of special steel balls for bearings of high-speed and high-precision numerical control machine tools. Background technique [0002] At present, precision high-speed CNC machine tool bearings are high-precision, high-tech bearings with high technical content and difficult development. At present, most of them need to rely on imports, which seriously restricts the localization process of precision high-speed CNC machine tools. It has become an urgent need to replace imports. DD. Bearings are mainly composed of steel balls, inner and outer rings and cages. Among the four major components of bearings, steel balls are the weakest link. The surface texture of steel balls directly affects the life of the bearing and the impact on bearing vibration and noise. The rate is above 60%, and more than 80% of bearing failures are due to the failure of steel balls. [0...

AI Technical Summary

Problems solved by technology

[0003] At present, there is not much difference between my country's steel balls and foreign high-precision steel balls in terms of "roughness", "roundness" and other aspects of single-grain geometric accuracy, but the vibration and noise values ​​​​of the bearings after assembly are quite different, resulting in this The difference, in addition to the difference in raw materials, is more important because of the difference in heat treatment level and steel ball forming process, which leads to the difference in the working state of the steel ball in the bearing, which has a greater impact on the vibration, noise and life of the bearing

[0004] The traditional steel ball production process generally adopts steel ball cold heading, light ball, quenching and tempering treatment, hard grinding, preliminary grinding, and fine grinding, but it still cannot meet the requirements of high-speed high-precision CNC machine tool bearing special steel balls