Composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings

Abstract

The invention discloses a composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings, belongs to the technical field of forging, turning, heating and grinding machining of the inner and outer rings of bearing components, and mainly solves the problems of low production efficiency and high rejection rate in a conventional machining method. The composite machining process is mainly characterized by comprising the following steps of: (1) cutting bar stock into straight material sections; (2) after heating, forming a single-forged inner ring and double combined-forged outer rings by using a pressing machine; (3) spheroidizing and annealing; (4) performing shot blasting to remove surface oxide scales; (5) after cutting the double outer rings, performing rough turning and soft grinding; (6) performing additional tempering; (7) performing the soft grinding on the outside diameter of the outer rings, and performing finish turning and rolling; (8) performing heat treatment in quenching and tempering furnaces, and performing shot blasting again; and (9) performing rough grinding machining, the additional tempering, finish grinding machining, super-finishing, cleaning and assembling. The composite machining process has the characteristics of great improvement on product qualification rate and production efficiency, and suitability for batch production on the premise of no increase of equipment investment, and is mainly used for machining the inner and outer rings of the narrow-series thin-walled high-precision conical thin-walled bearings.

Description

technical field [0001] The invention belongs to the technical field of forging, turning, heating and grinding of inner and outer rings of bearing parts. In particular, the invention relates to a compound processing technology for inner and outer rings of narrow series thin-walled high-precision conical thin-walled bearings. Background technique [0002] The 6-speed gearbox of DSI company exported to Australia is a narrow series of thin-walled high-precision conical thin-walled bearing inner and outer rings. The structural dimensions are as follows: the ratio of outer ring height to outer diameter: 0.09~0.12, wall thickness 5~5.5MM , The ratio of the height of the inner ring to the diameter of the raceway is: 0.15~0.2, and the wall thickness is 1.4~2MM. This type of narrow series thin-walled high-precision tapered thin-walled bearings is mainly exported to Australia's DSI company's 6-speed gearbox, two sets per box. The demand for this type of product is 51,500 gearboxes in ...

AI Technical Summary

Problems solved by technology

[0003] At present, the inner and outer rings of this kind of narrow series thin-walled high-precision tapered thin-walled bearings are mainly processed by conventional processes: the process flow of inner and outer rings is mainly processed by conventional processes: blanking-single inner and outer ring forging-spheroidizing annealing-rough turning-finishing Turning - heat treatment - shot peening - rough grinding - fine grinding - superfinishing - cleaning assembly, the disadvantages are that the outer ring is formed in a single piece, resulting in low forging production efficiency; There is no mandatory aging process before and after the rough turning process, so that the qualified rate of the product is only 50%

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