A multi-die synchronous roll forming method for large-diameter internal gear parts

Abstract

The invention discloses a multi-mould synchronous rolling forming method for a large-diameter internal-tooth moulded part. The multi-mould synchronous rolling forming method comprises the following steps: clamping workpiece blank, driving the workpiece blank by a rotary disc, and uniformly arranging N pairs of same rolling moulds in the peripheral direction of the workpiece blank, wherein each pair of rolling moulds is divided into an inner roller mould and an outer roller mould which are internally and externally matched for use, the inner roller mould is a tooth-shaped mould, and the outer roller mould is a cylindrical mould; regulating the centers of each pair of the inner roller mould and the outer roller mould, and the center of the workpiece blank on the same straight line; driving the workpiece blank to rotate, enabling the N inner roller moulds to synchronously feed in a radial direction, following up rotation of the workpiece blank through friction and tooth-shaped engagement,accomplishing plastic forming of the tooth shape on the workpiece blanking, keeping the outer roller mould fix axially, and performing auto-rotation through friction with the workpiece blank. The multi-mould synchronous rolling forming method can effectively reduce forming force, reduces equipment load, ensures accurate engagement in an inner gear ring forming process, and ensures roundness precision of the outer diameter of the inner gear ring.

Description

technical field [0001] The invention belongs to the technical field of advanced material forming, and in particular relates to a multi-mold synchronous roll forming method for a large-diameter (diameter greater than 100mm) internal tooth profile. Background technique [0002] Internal gear parts are important basic components and mechanical components in mechanical transmission devices, and are widely used in automobiles, aerospace, ships, equipment manufacturing and other fields. With the development of the equipment manufacturing industry, higher requirements are put forward for the performance of toothed parts. The main processing technology of the current internal tooth type is cutting processing and plastic forming technology. The processing of traditional tooth-shaped parts is mainly based on cutting, especially in the processing of large-diameter internal tooth parts. The main processing steps of the complex internal tooth shape are: rough milling, fine milling, grin...

AI Technical Summary

Problems solved by technology

This forming method has both axial and radial feeds during the forming process, which makes the deformation resistance of the forming material too large when processing parts with a larger tooth profile size than the blank; a single rolling die is used in the forming process , the forming efficiency is low, and the balance of force is difficult to guarantee. The forming mold requires high strength and sufficient impact toughness, etc.; the workpiece in the chuck mold needs a special tool to eject it after forming, and it is difficult to take the piece; at the same time, the chuck The overall size and shape of the disc mold are also limited by the size of the processed parts. It is difficult to process and manufacture large-diameter internal tooth parts, and it is more suitable for processing small-diameter tooth parts.

[0004] The literature (Veliko Ivanov, Rolling of internal threads: Part 2.Journal of Materials Processing Technology, 1997, 72 (2): 221-225.) discusses the rolling method of internal threads, and a plurality of forming dies are installed on a mandrel. Forming process, without radial feed, it is difficult to roll and form internal thread parts with large tooth height; it considers that 50mm or more is a large-diameter internal thread part, and this paper only gives a theoretical analysis example with an inner diameter of 50-60mm. However, due to Due to the limitation of the size of the mandrel, it is also difficult to process large-diameter internal threads (diameter greater than 100mm); in addition, for the internal thread forming of multiple dies, the phase position of each rolling die will affect the shape of the formed internal thread, but in this paper The phase adjustment method of each mold is not given

[0005] The literature (Zhang D W et al., A note on phase characteristic among rollers before thread or spline rolling. The International Journal of Advanced Manufacturing Technology, 2019, 100:391-399.) discusses the multi-die rolling external thread and external spline structure Die adjustment method; however, for multi-die roll forming of internal gear, internal thread, external gear, and external thread, the phase requirements of each die are not the same, and the rolling die phase of complex external surfaces (external gear, external thread) The adjustment cannot be used for phase adjustment of rolling dies with internal complex profiles (internal gears, internal threads)

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