Method for casting super-large composite-material caststeel bearing roller above 100 ton

Abstract

A technology for casting the ultra-large (more than 100 tons) bearing steel roller with composite 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, the different molten steels with different components are used for casting multiple times, top pouring and bottom pouring are combined, and the key parameters are controlled.

Description

technical field [0001] The present invention relates to the casting process of super-large composite cast steel backup rolls of more than 100 tons (backup rolls with a net weight of more than 100 tons are super-large backup rolls), and specifically relates to a super-large cast steel backup roll of composite material of more than 100 tons. casting method. It is suitable for the overall casting process of cast steel backup rolls of various types and specifications with a net weight of more than 100 tons of composite materials. Background technique [0002] The cast steel backup roll is a key part in the steel rolling production line, and it is also a vulnerable part. With the continuous increase of steel production, the consumption of backup rolls is also increasing. During the steel plate rolling process, the back-up rolls bear huge bending moments and torques on the rolling mill, and are subject to alternating loads, which are prone to fatigue damage. Internal defects su...

AI Technical Summary

Problems solved by technology

However, only the German GP company can produce cast steel rolls above 170 tons, and other companies do not have the ability to produce such large-scale backup rolls.

Due to the fact that there are few manufacturers of ultra-large cast steel backup rolls, the production capacity is limited, and the consumption continues to expand, so the market is in a serious shortage of supply.

[0004] The development difficulties of super-large cast steel backup rolls are mainly due to the large amount of molten steel, difficulty in preparing molten steel, and strict requirements on equipment; the axial dimension of the roll is long, the shrinkage of the solidification process line is large, and tensile stress cracks are likely to occur when shrinkage is hindered, so casting is difficult; molten steel The pouring time is long, secondary oxidation is prone to occur, oxidation inclusions are generated, and the internal quality is difficult to control; the roll is a slender shaft casting, the feeding distance is long, the feeding channel is difficult to keep unblocked, and shrinkage cavities and loose defects are prone to occur

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