Novel technology for forging spline shaft of transmission shaft

Abstract

The invention relates to a novel technology for forging a spline shaft of a transmission shaft. The novel technology includes following steps: (1), blanking; (2), medium-frequency heating; (3), pre-forging: after the medium-frequency heating, a blank material is placed in a cavity of a pre-forging die body of a spline shaft hammer forging die on a hammer forging machine, the hammer forging machine is controlled, a power drive end drives the pre-forging die body to stamp the blank material, and the blank material is stamped into a pre-forging piece of the spline shaft; (4), finish-forging: the pre-forging piece is placed in a cavity of a finish-forging die body of the spline shaft hammer forging die on the hammer forging machine, the hammer forging machine is controlled, the power drive end drives the finish-forging die body to stamp the pre-forging piece, and the pre-forging is stamped into a finish-forging piece. The novel technology is reasonable in design and simple in structure, forging pieces are easy to be formed, and rejection rate of the forging pieces is greatly lowered. Gathering process is eliminated, production efficiency is improved, and production cost and die making cost are lowered. Inner diameters of shaft body cavities of a pre-forging cavity and a finish-forging cavity are reduced, and processing amount of a machine is reduced and raw material is saved.

Description

technical field [0001] The invention belongs to the technical field of the automobile industry, and in particular relates to a new forging process of a transmission shaft spline shaft. Background technique [0002] At present, the forging process under the mold structure under the traditional spline shaft forging technology is: blanking-intermediate frequency heating-gathering-pre-forging-final forging. Using this mold to complete the forging of the forging, the increase of the gathering process not only increases The cost of mold materials and mold processing is increased, and the mold production cycle is increased. Only in mold production, the production cost is greatly increased. In addition, the increase of this work step reduces production efficiency and increases labor hours, which is also invisible. Increased labor production costs. [0003] That is, the traditional flat forging die has the following defects in the forging process of the spline shaft: 1. Since the fr...

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Problems solved by technology

[0003] That is, the traditional flat forging die has the following defects in the forging process of the spline shaft: 1. Since the free upsetting ratio of the forging exceeds 3.0, the forming of the forging is difficult and the scrap rate of the forging is high; 2. The production efficiency is low and the production cost 3. There is one more aggregated mold body on the mold, which brings inconvenience to the mold processing and increases the mold processing cost; 4. The inner diameter of the shaft body cavity of the pre-forging cavity and the final forging cavity is 35mm, and the forged flower The rod part of the key shaft has a relatively large amount of processing, which wastes a lot of raw materials

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