Composite machining technology for serial high-accuracy shafts with notches

Abstract

The invention relates to a composite machining technology for serial high-accuracy notch shafts, belongs to the technical field of shaft parts grinding and mainly solves the problem that the rejection rate is as high as 40% to 50% in a prior milling machine machining technology. The composite machining technology is mainly characterized by lathing straight material sections as required by design; performing quenching and heat treatment through a tempering furnace till the surface hardness HRC is in a range of 60 to 65; using a centerless external cylindrical grinder for outer diameter coarse grinding, and performing flaw detection afterwards; using the centerless external cylindrical grinder for outer diameter fine grinding; machining notches through a linear cutting machine; performing surface polishing with a polishing machine; and using a spray-type cleaning machine for demagnetization cleaning and cleaning rust prevention to obtain high-accuracy shafts with notches. The composite machining technology has the advantages of being low in equipment investment, high in product quality and qualified rate and suitable for batch production. The qualified rate is 99%, 300 pieces/8 hours are produced per shift, and the machining technology is mainly used for machining high-accuracy notch shafts.

Description

technical field [0001] The invention belongs to the technical field of shaft parts grinding. It specifically relates to a series of high-precision notched shaft compound processing technology. Background technique [0002] The Sinovel Wind Power Division of Dalian Heavy Industry Crane Group is now mainly responsible for the production of 1.5 MW wind turbines. The output has increased steadily in recent years. In 2009, it plans to produce 2,000 wind turbines. In addition to 1.5 MW wind turbines, Sinovel is now focusing on R&D and production of 3 MW wind turbines, which are currently the mainstream models in the wind power market. A 1.5 MW wind turbine uses 4 yaw drives and 3 pitch drives. At present, the components of Sinovel's first batch of 3 MW units mainly rely on imports. There are three high-precision notch shafts in both the yaw drive and the pitch drive, which are notch shafts with an outer diameter of φ15 ~ φ120MM, a roundness of 0.003~0.008MM, and a cylindricity...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the notch is completed before heat treatment, it is easy to bruise the notch part of the product during the subsequent processing of handling and heat treatment. After the product appearance selection, the notch bruised waste is 5 ~ 10%;

[0005] 2. Since the notched shaft is at 80~112MM, the centerless through-grinding process is adopted. During the grinding process, the grinding force on the notched surface will increase instantaneously, resulting in out-of-poor roundness of the notched part, resulting in a 40-50% reject rate

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