Composite fabrication process for tooth blank of automobile gear shifting box combining tooth

Abstract

The invention is a compound making technique of automobile gear-box combined gear blanks, adopting finely forge-molding processing method. It heats the blank material to 1000-1200 deg.C, premolding the blank material on a hot mold forging press, after constant-temperature normalizing, eliminating oxide debris by impeller cleaning, and surface bonderizing and phosphatization, making cold-refining on tooth form, and finally making cone molding on the tooth by radial extruding method. It instantaneously completes hot mold forging premolding, refining, and cone molding on the press without cutting, saving material, saving labor, low-cost, high-efficiency, long-service life. The combined tooth root has no escrape, it has no stress concentration phenomenon and the tooth has high strength; the extrusion molding of the gear blank does not destroy metallic streamlines, it heightens the synthetic performance, the product quality is stable and can meet use and industrialized production requirements of top-grade autocars.

Description

technical field [0001] The invention relates to a compound manufacturing method of an automobile gearbox combined with a gear blank, and belongs to the technical field of forging and pressing processing of metal parts. Background technique [0002] It is very important to combine the gears of automobile gearboxes for the gear shifting of automobiles, and the processing requirements for the gear blanks are very high. There are generally three traditional processing methods: one is to forge the blank and then use mechanical cutting to shape the tooth part. Strength; the second is that the joint tooth part is processed separately from the main body, and is formed by spline press fit, which is also labor-intensive and difficult to guarantee accuracy; the third is that the joint tooth part is processed separately from the main body, and is formed by electron beam welding, resulting in stress concentration Phenomenon. All there is efficiency low, cost is high in above three kind...

AI Technical Summary

Problems solved by technology

However, the precision forging preforming process currently used is to directly cold form the billet on a press at room temperature. During the preforming process, due to the high deformation resistance of the material, the life of the die is very low, which cannot meet the requirements of industrial production.