High precision hot press silicon nitride ceramic ball bearing and its manufacturing method

Abstract

A high-precision hot-pressed silicon nitride ceramic ball bearing and its manufacturing method belong to bearing manufacturing technology and are suitable for installation on high-precision, high-speed, high-end CNC machine tools and machining center spindles. The high-precision hot-pressed ball bearing provided by the invention Silicon nitride ceramic ball bearings include: an inner ring and an outer ring made of steel. The inner ring and the outer ring respectively have ball bearing arc raceways; they are arranged between and in contact with the inner and outer ring ball bearing raceways. Ceramic ball rolling elements; a rolling element isolation ring, that is, a cage, arranged between the inner and outer rings to hold the ceramic balls; its characteristic is that the ceramic ball rolling elements are obtained by conical grinding processing technology and technical equipment, and its accuracy is Reached G5 and G3 levels. The characteristics of the invention are: high limit operating speed; high operating accuracy; high temperature resistance and can operate without lubrication; light weight; long-term stable operation in some highly corrosive media; high degree of standardization, easy maintenance and interchange.

Description

Technical field [0001] The invention relates to a high-precision angular contact ball bearing, in particular to a high-precision hot-pressed silicon nitride ceramic ball bearing and a manufacturing method thereof. It belongs to the bearing manufacturing technology and is suitable for installation in high-precision, high-speed, high-end CNC machine tools. and on the machining center spindle. Background technique [0002] CNC machine tools are important basic equipment for the national economy, which reflect the comprehensive strength level of a country. The core support of the CNC machine tool spindle is a high-speed precision ball bearing. The steel ball rolling elements in the ball bearing are held laterally by a steel cage. The steel balls are arranged in the raceways of the inner and outer rings also made of steel. The main disadvantage of these known bearings is the limited service life at high rotational speeds. This is because the poor performance of the frictional s...

AI Technical Summary

Problems solved by technology

[0004] Since the hot-pressed silicon nitride material is a hard and brittle material that is extremely difficult to process, the current international market can only provide limited ceramic balls below grade 10.

G5 and G3 ceramic balls are nowhere to be purchased, and the corresponding high-precision ceramic bearings are also unavailable

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