Powder metallurgy processing technology of gearbox sprocket

Abstract

The invention discloses a transmission sprocket powder metallurgy processing technology, which includes forming, sintering, shaping, heat treatment and machining processes, the forming mold used in the forming process includes a forming upper mold and a forming lower mold, and the shaping mold used in the shaping process includes Shaping upper mold and shaping lower mold. The forming lower mold includes a vertically extending forming mandrel. The lower three punches are set on the forming mandrel, and the lower two punches are set on the lower three punches. There is a next punch, and a forming die is fixedly set on the next punch. The forming upper die includes the upper two punches and the upper punch fixed on the upper two punches. The shaping lower die includes the shaping core rod. The upper sleeve of the rod is provided with a lower punch, and the plastic upper die includes an upper punch. For sprockets with external spline shafts used in gearboxes, this mold can be used for one-time pressing and forming, which can effectively improve production efficiency; it can reshape sprockets after sintering, correct small deformations in the sintering process, and improve product quality. quality.

Description

technical field [0001] The invention belongs to the field of powder metallurgy processing technology, and in particular relates to a powder metallurgy processing technology of a gearbox sprocket. Background technique [0002] Powder metallurgy is a process technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. [0003] Some sprockets used in gearboxes have external spline shafts. The outer wall of this type of external spline shaft sprocket has sprocket teeth and spline teeth at the same time. When manufacturing this type of sprocket by powder metallurgy, it is necessary to After the pressing is completed, the method of mechanical processing is used to process the splines on the green body. The process is complicated and the production efficiency is low. At the same time, the pressed green body will...

AI Technical Summary

Problems solved by technology

[0003] Some sprockets used in gearboxes have external spline shafts. The outer wall of this type of external spline shaft sprocket has sprocket teeth and spline teeth at the same time. When manufacturing this type of sprocket by powder metallurgy, it is necessary to After the pressing is completed, the green body is machined into splines by mechanical processing. The process is complicated and the production efficiency is low. At the same time, the pressed green body will be slightly deformed after sintering, which will affect the product quality.

Images