Forging process for locomotive sliding fork

Abstract

The invention discloses a forging process of a sliding fork for a locomotive. A. According to the following steps: blanking: design the blanks of two sliding forks so that the two ends of the fork are opposite to form a group of blanks; B. Heating: The assembled rough blanks are heated and kept warm after heating; C. Pre-pressing: the pre-pressed blanks are put into the pre-pressing mold for pre-pressing and forming, and the scale is removed at the same time; D. Final forging: the pre-pressed blanks are put into Final forging in the final forging die; E. Trimming: Use a press to remove the flash from the final forged billet; F. Cutting: Cut the cooled billet from which the flash has been removed, and divide it into two parts to obtain two pieces. locomotive with sliding fork. The invention avoids the artificial billet making process, simplifies the operation process, reduces the working intensity, has a high degree of automation, improves the product quality and stability, and the force of the forging is more balanced during forming. The whole process only needs one heating, and the surface of the blank There is less scale and the surface quality of the product is improved.

Description

technical field [0001] The invention relates to a forging process, in particular to a forging process of a sliding fork for a locomotive. Background technique [0002] The sliding fork is an important connecting part in the assembly of the cardan shaft of Dongfeng type locomotive of our company. One end of this part is a stepped shaft structure, and the other end is a fork structure. In order to ensure the strength of the product, the blank is forged. The current process adopts the process plan of pre-forging and final forging. During pre-forging, the rod is pulled out and the fork is split on the free forging hammer. During final forging, it is formed once or twice in the die cavity. [0003] The existing processing technology carries out the forging design according to the part size, and selects a 150mm×150mm billet for blanking, and the blanking length is 170mm. Heat the billet to 1200°C, keep it warm for half an hour, and make a billet on a free forging hammer. First,...

AI Technical Summary

Problems solved by technology

[0005] 1. The blank-making process, especially the shape and size of the fork, mainly depends on the operator's visual observation and long-term accumulated experience. It is difficult to use more precise tools and molds to ensure that the size of each blank is not exactly the same, which leads to mold Forged products are prone to forging defects such as folding and filling in the fork and transition area;

[0006] 2. The two heating processes make the surface of the raw material adhere to a thick oxide skin, resulting in oxide pad damage and folding on the surface of the final product.

At the same time, the hard oxide skin causes excessive loss of the mold during the production process and reduces the service life;

[0007] 3. The part is an asymmetric structure, and the force is uneven during die forging, which is easy to cause wrong die;

[0008] 4. The production efficiency of the original process scheme is low;

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