Centrifugal casting method for thin-working layer composite cast iron roll

Abstract

The invention discloses a centrifugal casting method for a thin-working layer composite cast iron roll. The thin-working layer composite cast iron roll comprises a working layer, a combined layer and a core which are arranged in sequence from outside to inside; the working layer adopts one-step casting manner; the combined layer adopts a casting manner of at least three layers; the thickness ratio of the solidified liquid iron of the working layer to that of the first layer of the combined layer is (0.3-0.5) to 1; the thickness ratio of the solidified liquid iron of each layer excepting the first layer of the combined layer to that of the previous layer of the combined layer is 1 to (0.6-0.8). According to the centrifugal casting method, the combined layer is produced in a layering-casting manner, so that the good metallurgical combination of the combined layer, the working layer and the core of the manufactured roll is realized on the premise of meeting requirements of the thickness of the working layer; heavy-alloyed liquid iron in the working layer is effectively prevented from fusing into the combined layer; lower rigidity of the combined layer is guaranteed; the punching operation for a roll body is facilitated.

Description

technical field [0001] The invention relates to the field of roll casting, in particular to a pouring method for a thin working layer composite cast iron roll. Background technique [0002] The commonly used composite cast iron roll refers to a roll composed of three parts: the working layer, the bonding layer and the core. Composite cast iron rolls are usually divided into thick working layer composite cast iron rolls and thin working layer composite cast iron rolls. Thick working layer composite cast iron rolls are usually used in the field of steel rolling, and the thickness of the molten iron in the working layer is usually about 100mm, while the thickness of the working layer of the centrifugal roll used in ordinary hot strip tandem rolling mills can even reach more than 200mm. And there is no clear requirement for the hardness of the bonding layer, and the water cooling method can be directly used to impact the working layer for cooling. Therefore, no matter what cast...

AI Technical Summary

Problems solved by technology

[0003] Since the thickness of the working layer of the thin working layer composite cast iron roll is relatively thin, the molten iron in the bonding layer will cause partial erosion to the solidified part of the working layer during the pouring process. The eroded part contains a large amount of alloy. If the erosion amount is too large, the It will cause high alloy content and high hardness in the bonding layer

If the traditional production method is followed, that is, after the pouring of the high-alloy molten iron in the working layer is completed, the bonding layer and the core filling are poured by static casting, which will inevitably make the molten metal with high alloy content in the working layer melt into the bonding layer, resulting in the bonding The alloy content and hardness of the layer increase, which will affect the punching of the roll body in the later stage, and even produce waste rolls that cannot be punched