Involute-gear rolling mold and forming technology

Abstract

The invention discloses an involute-gear rolling mold and forming technology. The rolling mold comprises a first rolling mold body and a second rolling mold body which are parallelly arranged at intervals, and the tooth number and the mold number of the two molds are same; a zero-pass tooth area, a first-pass tooth area, a second-pass tooth area and the like, a N-pass tooth area are sequentially arranged on the first rolling mold body; the tooth type in all the pass tooth areas is same; the first rolling mold body and the second rolling mold body are same in structure, and tooth types are formed in an involute mode; the areas from the zero-pass tooth area to the N-pass tooth area are clockwise arranged on the first rolling mold body, and are clockwise arranged on the second rolling mold body. According to the involute-gear rolling mold and forming technology, blanks are rolled in a fixed-point mode, the center distances between the rolling mold bodies are fixed, the rolling mold does not need to be fed in a radial-direction mode in the forming process, blanks are balanced in stress, accurate in positioning and small in uneven deformation; the speed forced synchronization rolling mode is adopted, dynamic graduation of the tooth type in the forming process is achieved, and the tooth-distance accumulative errors caused by free-graduated rolling are eliminated.

Description

technical field [0001] The invention relates to the technical field of gear processing, in particular to an involute gear rolling die and a forming process. Background technique [0002] Gear roll forming generally refers to the plastic forming process in which the blank is continuously plastically deformed under the action of a pair of toothed dies rotating in the same direction to obtain the desired gear forging or forging billet. The current process is to place the cylindrical blank between two symmetrically installed rolling dies with external teeth. During the rolling forming process, the molds rotate synchronously, at the same speed and in the same direction, and feed along the radial direction of the blank. Under the action of friction torque, the blank is driven to rotate, and at the same time, the tooth shape of the mold is continuously pressed into the surface of the blank, so that the surface metal material is plastically deformed, and the tooth height is continuo...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a rolling die and forming process for involute gears, so as to overcome the problems in the prior art that the tooth shape precision is out of tolerance and performance decline caused by uneven tooth division during unidirectional rolling; in the present invention, Balanced blank force, accurate positioning, less uneven deformation

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