Method for casting super-large single-material cast steel bearing roller above 100 ton

Abstract

A technology for casting the ultra-large (more than 100 tons) bearing steel roller with single material features that a computer simulation method is used to design a metallic mould, such techniques as covering sand on iron mould and the insulating riser head are used for sequential solidifying, casting multiple times, electric heating multiple times and composite riser head are used, top pouring and bottom pouring are combined, and the key parameters are controlled.

Description

technical field [0001] The invention relates to the overall casting process of super-large cast steel backup rolls over 100 tons (net weight over 100 tons is super-large backup rolls), in particular to a casting process of single-material super-large cast steel backup rolls over 100 tons method. It is suitable for the overall casting process of cast steel backup rolls of various types, specifications and materials with a net weight of more than 100 tons. Background technique [0002] The steel rolling output continues to increase, especially the wide and thick plate rolling production lines continue to increase, and the demand for super-large cast steel backup rolls above 100 tons is increasing. The production capacity of large rolls and super large rolls in my country is limited, so that the roll market is in short supply. [0003] Countries in the world that can produce super-large rolls mainly include Germany, Japan, South Korea, etc. Among them, GP Roll Co., Ltd. in Ge...

AI Technical Summary

Problems solved by technology

Back-up rolls produced by forging have a long production cycle and high cost, which increases a lot of expenses, so there is an urgent need to develop super-large cast steel back-up roll preparation technology

[0005] The technical difficulties in the preparation of super-large rolls are that there is a lot of molten steel in one smelting, the rolls are highly sensitive to thermal cracking, and the castings are difficult to form; the heat treatment takes a long time, there are many processes, and the equipment requirements are strict; the roll solidification time is long, the electric heating time is long, and segregation is difficult to control; The thermal impact on the mold is large, and the mold is easy to crack, resulting in casting failure; the length of the roll is too long, it is difficult to feed, and it is prone to shrinkage cavities and loose defects; the axial shrinkage distance of large rolls is long, so once the shrinkage is hindered, tensile stress cracks will appear , making the roll scrap

Roll pouring molten steel with a net weight of more than 100 tons is often more than 200 tons, so it is very difficult to develop

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