Forging and rolling technology and hot rolling and forging apparatus for making large pulley

Abstract

The present invention discloses forging and rolling technology for large pulley. The forging and rolling process includes hot forging and upsetting steel blank to the required thickness and diameter, die forging to form the hub and spokes, and hot rolling to form the inner circular surface, end surfaces, outer circular surface and slot in circumference of the rim. The present invention also provides the corresponding hot rolling apparatus. The present invention can obtain pulley with high strength, high wear resistance, small internal stress, less deformation and other advantages.

Description

technical field [0001] The invention belongs to the technical field of metal hot rolling pressure processing, and more specifically, the invention relates to a forging and rolling technology of a large pulley. The invention also relates to the hot-rolling forging equipment adopting the forging-rolling technology. Background technique [0002] The structure of the pulley generally includes the hub, the spokes, the rim and the ring groove on the rim. It is one of the important components of the lifting and transportation equipment. Its shape is complex, it bears a large load, and the working environment is harsh. The diameter of the pulley of general hoisting machinery is small, and its structure is generally made of cast steel, and its manufacturing process is mainly to be machined after casting; for pulleys with larger diameters, the current generally known technology is to use welding methods to process and manufacture The method is that the wheel hub of the pulley is made...

AI Technical Summary

Problems solved by technology

Using this processing method, because the welding stress of the material is large, the uneven heating and cooling rate will lead to uneven metallographic structure, and deformation will occur during processing and use; the metal fiber structure is discontinuous, especially the wheel groove of the pulley. Cutting processing will lead to the decline of mechanical properties such as strength and toughness of the product, which will affect the performance of the product; the production efficiency is low because it needs to forge the hub, cut the rim with thick steel plate or roll the ring blank, and cut the spoke plate with medium-thick steel plate Or ribs, then welded, and finally cut, the process is complicated and the process route is long

In addition, because the cut scraps become waste products, and the wheel groove is processed by cutting, the cutting allowance is large, so the material waste is large

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