Tech. for forging forming of hook fastener flame of wagon and maould thereof

Abstract

A technology for manufacturing the coupler tail frame of cargo train by forging includes such steps as blanking, heating, making raw coupler tail frame, die forging step by step, that is, forging one end and then another end, removing excessive edge, bending an welding. Its die set is composed of upper die with internal cavity whose length is equal to that of finished blank, and lower die with internal cavity having a central locating pit.

Description

technical field [0001] The invention relates to a processing method and equipment for manufacturing a coupler frame for railway freight cars, in particular to a forging forming process of a coupler frame for railway freight cars and a mold used in the process. Background technique [0002] The coupler frame of railway freight car is a commonly used force transmission, load bearing and connecting part on railway freight cars. Its quality standards are relatively high, and the specific standards are shown in GB / T17425-1998. The coupler frame in the prior art basically adopts the production process of cast steel billet, adopts the casting method to obtain the blank, and then adopts machining to obtain it. However, the shortcomings of casting billets mainly include: there are defects such as shrinkage cavities, shrinkage porosity, inclusions, air bubbles, and large internal stresses inside. During use, cracks will be induced and lead to scrapping; now, there are also The manufa...

AI Technical Summary

Problems solved by technology

However, the shortcomings of casting billets mainly include: there are defects such as shrinkage cavities, shrinkage porosity, inclusions, air bubbles, and large internal stresses inside. During use, cracks will be induced and lead to scrapping; now, there are also The manufacturer is experimenting with the method of integrally forging the blank of the coupler frame, and mainly adopts the method of free forging, die forging, bending and welding to process the blank of the coupler frame

Due to the large force-bearing area of ​​the blank developed by the coupler frame parts, the largest existing forging equipment (such as: 16-ton die forging hammer, 12500-ton hot-die forging press, 2500-ton friction press, etc.) Therefore, in the test, there are still a series of problems, especially the following four main problems are difficult to solve: 1. The wall thickness does not meet the requirements, and the wall thickness is higher than that of the coupler frame parts technology The required size is much thicker; mainly due to the limitation of the pressure tonnage of the forging equipment, the mold is not reliable, so that the forgings have a large thickness direction

In order to obtain forgings with qualified dimensions, forging machinery with greater pressure tonnage must be used, which requires special non-standard, larger-scale forging machinery and workshops and other facilities, requiring greater and more investment and resources; 2. Due to The billet is made by free forging, the shape and size of the billet are unstable, and the amount of billet consumed is large, which not only wastes raw materials, but also has a low production efficiency of billet making, which seriously limits the production efficiency of the forging of the hook tail frame; 3. Due to the production of blanks The efficiency is low, the processing time is long, the heat of the blank is dissipated quickly, and the temperature of the workpiece quickly drops to the temperature range that cannot be processed. It often needs two or even three times of heating to complete the forging forming process; the heat energy consumed by this process is It is very large and consumes more natural resources; 4. The manufacturing cost, processing cost and production cost of the product are all high, and the geometric size cannot meet the requirements, so it cannot meet the needs of the market

[0003] With the development of railway transportation, the speed of railway transportation has been increased many times, and the running speed of railway freight cars has also been greatly improved, which puts forward new requirements for the quality of the coupler frame; the existing casting products and free forging products can no longer meet the requirements of railway freight cars "High speed, heavy load, safety" requirements

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