Differential shaft forming die and process

Abstract

The invention discloses a differential shaft forming die and process, and relates to the field of differential spiders. The die comprises an upper die body and a lower die body, the lower die body is provided with an upsetting area, a pre-forging area A and a precision forging area A, the position, corresponding to the pre-forging area A, of the upper die body is provided with a pre-forging area B, and the position, corresponding to the precision forging area A, of the upper die body is provided with a precision forging area B; a positioning boss is arranged in the upsetting area, and positioning bosses are also arranged in the centers of the pre-forging area A and the pre-forging area B; cross-shaped grooves are formed in the pre-forging area A and the pre-forging area B with the positioning bosses as the centers, four damping bosses are symmetrically distributed on the fork portion of the cross-shaped groove in the pre-forging area A, and a damping groove is formed in the position, corresponding to each damping boss, in the pre-forging area B; and positioning bosses and cross-shaped grooves are also formed in the corresponding positions of the precision forging area A and the precision forging area B. The length consistency in the X / Y direction after differential shaft pre-forging is guaranteed, the phenomena of material shortage and die staggering of the shaft end of a forged part are effectively avoided, and the product percent of pass and the material utilization rate are increased.

Description

technical field [0001] The invention relates to the field of differential cross shafts, in particular to a differential shaft forming mold and a forming process. Background technique [0002] The forming process of the existing differential shaft (differential cross shaft) is: blanking→upsetting→pressing→pre-forging→finish forging. [0003] Among them, the rough forging station is freely upsetting on the parting surface of the mold, which is controlled by the experience of the workers, and the upsetting height is random; [0004] Pressing station, the thickness of the pressing is controlled by the experience of workers; [0005] For the pre-forging station, due to the fluctuation of the upsetting height dimension and the crimping thickness dimension, the protruding lengths of the four shafts after crimping are inconsistent, resulting in differences in the pre-forging X-direction length and pre-forging Y-direction length. [0006] In addition, the existing differential shaf...

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Problems solved by technology

[0005] For the pre-forging station, due to the fluctuation of the upsetting height dimension and the crimping thickness dimension, the protruding lengths of the four shafts after crimping are inconsistent, resulting in differences in the pre-forging X-direction length and pre-forging Y-direction length

[0006] In addition, the existing differential shaft molding die adopts ordinary hot forging dies. Due to the long journal of the differential shaft, it is difficult to fill the end of the journal before forming burrs, and the burrs are thick.

As a result, after precision forging, the shaft end is full of meat, lack of meat and partial wear, resulting in high scrap rate and low material utilization rate.

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