Cold extrusion forming method of thin-walled inner cone splined hub

Abstract

The invention belongs to a processing method of a thin-walled inner cone splined hub and in particular relates to a cold extrusion forming method of the thin-walled inner cone splined hub. The method solves the problem that the thin-walled inner cone splined hub is not easy to process by using the prior art. The method comprises the following steps: quenching and tempering a blank, lathing with outside round surface, drilling, boring a tapered bore, performing cold extrusion of a tapered spline, checking and performing phosphorization, wherein molybdenum disulfide is used for lubricating during the cold extrusion process. By adopting the method of the invention, the one-step molding of the thin-walled inner cone spline hole can be realized, the production efficiency is increased by 5-50 times, the product qualification rate is over 95%, and the surface strength of the spline is strengthened through extrusion. The cold extrusion process adopts molybdenum disulfide for lubricating, thus reducing the friction between the extruding cutter and the part, thoroughly solving crack of the thin-walled sleeve during cold extrusion process and successfully using the cold extrusion technology of the cone spline.

Description

technical field [0001] The invention belongs to a processing method of a thin-walled inner cone spline sleeve, in particular to a method for cold extrusion forming of a thin-walled inner cone spline sleeve. Background technique [0002] In mechanical connection, thin-walled taper spline sleeve parts are mostly used in automobiles and construction machinery due to structural design requirements. The main process method usually used is to process the small-diameter taper hole of the spline, and then adopt the method of slotting or hot extrusion. These methods have low processing efficiency and difficult to guarantee product accuracy. The cold extrusion molding method is sometimes used, but because the parts are easily broken during the cold extrusion process and the scrap rate is high, this method cannot be promoted. Therefore, the processing of the thin-walled inner cone spline sleeve has become a difficult point in the process. Contents of the invention [0003] In order...

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Problems solved by technology

[0003] In order to solve the problem that the thin-walled inner cone spline sleeve is not easy to process in the prior art, the present invention provides a method for cold extrusion forming of the thin-wall inner cone spline sleeve, which is a method that can make the thin-walled inner cone spline sleeve The sleeve is not broken, the product accuracy meets the requirements, and the spline surface is strengthened.

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