Horizontal forging technology for middle-sized spline shaft yoke

Abstract

A horizontal forging technology for a middle-sized spline shaft yoke comprises the following steps that firstly, blanking is carried out, the diameter of a blank is 55 mm, the material 40Cr is adopted, and the length of the blank is 295 mm; secondly, upsetting is carried out, the end of the blank is heated, the heating temperature is 1,150 DEG C, the heated blank is a blank to be upset, then, the blank to be upset is placed in a spline shaft yoke cavity of a pre-forging female die of a spline shaft yoke horizontal forging die on a horizontal forging machine, then, a power drive end drives a pre-forging male die to carry out upsetting on the blank to be upset, and a pre-forged piece blank is formed after upsetting is finished; and thirdly, finish forging is carried out, the pre-forged piece blank is taken out and placed in a spline shaft yoke cavity of a finish forging female die of the spline shaft yoke horizontal forging die on the horizontal forging machine, the horizontal forging machine is operated, the power drive end drives a finish forging male die to conduct upset-extruding on the pre-forged piece blank, and a finish forged piece is formed after upset-extruding is finished. According to the horizontal forging technology, the design is reasonable, the structure is simple, the forged piece is easy to form, and the rejection rate of the forged piece is greatly reduced; and the production efficiency is improved, and the production cost and the die manufacturing cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of the automobile industry, and in particular relates to a medium-sized spline shaft fork flat forging process. Background technique [0002] Traditional spline shaft forging belongs to hammer forging die forging. The process includes blanking-medium frequency induction heating-drawing-lengthening-pre-forging-final forging-trimming. Die design and heating operation are relatively cumbersome and complicated, and products with different structures must be designed. Different billets, pre-forging cavities and final forging cavities have brought great resistance to standardized design and operation. The traditional spline shaft forging process has the following problems: [0003] The medium-sized spline shaft fork structure is a product with a wide fork and a slender rod. The diameter of the fork rod of the medium-sized spline shaft is 55mm. When using a billet with a diameter of 78mm in the traditional process,...

AI Technical Summary

Problems solved by technology

[0002] Traditional spline shaft forging belongs to hammer forging die forging. The process includes blanking-medium frequency induction heating-drawing-lengthening-pre-forging-final forging-trimming. Die design and heating operation are relatively cumbersome and complicated, and products with different structures must be designed. Different billets, pre-forging cavities and final forging cavities have brought great resistance to standardized design and operation. The traditional spline shaft forging process has the following problems:

[0003] The medium-sized spline shaft fork structure is a product with a wide fork and a slender rod. The diameter of the fork rod of the medium-sized spline shaft is 55mm. When using a billet with a diameter of 78mm in the traditional process, the spline shaft fork rod needs to be pulled out several times. To meet the forming requirements, there are high requirements for workers' operation skills, high labor intensity and high scrap rate, and the forging process of the medium-sized spline shaft fork makes it impossible for the drawn billet to be placed horizontally and accurately on the spline shaft of the pre-forging die The unreasonable design of the fork cavity and pre-forging may easily cause problems such as lack of material in the final forging, scraping and folding, etc. Therefore, the design requirements for the spline shaft fork cavity of the pre-forging die are relatively high. Solidification is very difficult; the shape design of the traditional long table cannot guarantee the consistency of the length of each blank, and it is too dependent on the subjective operation ability of the workers, and requires high operating skills of the workers;

[0004] In addition, medium-frequency heating in the forging process of medium-sized spline shaft and fork is overall heating, which consumes a lot of energy for heating the billet, wastes materials, and increases forging costs; moreover, the forging process of medium-sized spline shaft and fork adopts hammer forging technology, and the electro-hydraulic hammer mold required for hammer forging is relatively large. Heavy, difficult to install, loud equipment operation noise, easy to produce misalignment and bending of forgings, poor quality consistency of forgings

Images