Precision forging method of railroad car fastener and die using in the method

Abstract

The invention relates to a method for precision forging of a fastener used in railway vehicle and a die used in the method. The forging method comprises the following steps: (1) a pre-forged piece with a fastener groove of 30-60 degrees is forged and molded on a die hammer; (2) the pre-forged piece of the fastener is bent and shaped to form a groove of 7 degrees by dies and a friction press; (3) edges are cut by a press. The dies used in the step (2) comprise a lower die, an upper die, a spring, a guide post and a baffle. The upper die is provided with a left and a right die blocks which forman integrated die impression, are closely attached to each other in the horizontal direction and are capable of moving relatively in the vertical direction. A bulge corresponding to the shape of the groove of the forged piece and a boss for positioning the forged piece are arranged on the lower die. The invention has the advantages of adequately utilizing the particularity of the shape of the fastener, adding a bending step to shape the parts which are hard to be shaped by once forging in other manners, thus saving materials, greatly shortening the milling time and achieving notable economic benefit.

Description

technical field [0001] The invention relates to a precision forging method of a railway vehicle clip and a mold used for the method, in particular to a precision forging method of a railway vehicle clip with little or no allowance. Background technique [0002] The rail vehicle clip is one of the basic components of the L-B type combined brake beam, which fixes the brake beam by cooperating with the left and right pillars. At present, the domestic production process of this product is hammer upper die forging and press trimming, which has the following two disadvantages: 1. The upper surface of the forging part coincides with the parting surface, and the die chambers are mainly concentrated in the lower die. Misalignment is often difficult to detect, while Once there is a misalignment phenomenon, it will have a series of adverse effects on the later machining and assembly; 2. The angle of the matching groove on the part is very small, narrow and deep, and it is very difficul...

AI Technical Summary

Problems solved by technology

At present, the domestic production process of this product is hammer upper die forging and press trimming, which has the following two disadvantages: 1. The upper surface of the forging part coincides with the parting surface, and the die chambers are mainly concentrated in the lower die. Misalignment is often difficult to detect, while Once there is a misalignment phenomenon, it will have a series of adverse effects on the later machining and assembly; 2. The angle of the matching groove on the part is very small, narrow and deep, and it is very difficult to form it directly by forging , and the mold is severely damaged, and the mold life is very low

Therefore, in the past, the forming part was not considered when designing the mold, and the groove was completely realized by three times of milling, which not only wastes raw materials but also prolongs the production cycle, and the production cost is high

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