A device and method for preparing bimetallic composite rolls by electroslag remelting

Abstract

A device and method for preparing bimetallic composite rolls by electroslag remelting. The device includes an upper crystallizer and a lower water-cooled crystallizer of a T-shaped crystallizer; the upper crystallizer is a conductive crystallizer and is insulated from the lower water-cooled crystallizer. The water-cooled crystallizer is equipped with a liquid level detector; the power supply of the remelting composite transformer is connected to the upper crystallizer through a short network wire; the method is: after the slag removal is completed, disconnect the slag power supply circuit; when pouring slag, when the slag pool in the crystallizer is When the liquid level submerges the lower edge of the conductive graphite block, the roll core preheating power supply circuit is turned on and the roll core is preheated; after preheating is completed, the circuit is closed and the consumable electrode is lowered to its end and inserted into the slag pool to conduct conduction. Through the electrode melting and bimetal compounding power supply circuit, the bimetallic melting and compounding is carried out. The present invention reasonably optimizes the temperature field on the surface of the roll core by improving the electroslag test device and power supply circuit, so as to prepare a bimetal composite roll with better interface bonding quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a device and method for preparing bimetallic composite rolls by electroslag remelting. Background technique [0002] In recent years, with the advent of advanced rolling mills and high-efficiency rolling technology, the roll production line is developing towards large-scale, high-speed and automatic, which makes the working conditions of the roll, the main consumable equipment in steel rolling production, more severe. The performance of the roll directly affects the production efficiency of the rolling mill, the surface quality of the rolled material and the rolling cost. Therefore, the research on the material and production process of the roll has become a common concern of the roll and metallurgical industries at home and abroad. [0003] As we all know, the traditional single-material alloy roll is difficult to meet the dual requirements of wear resistance and ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of the power supply circuit scheme in the process of preparing composite rolls by the traditional electroslag remelting method and the lack of effective preheating of the roll core in the early stage of the test, resulting in insufficient bonding defects at the bimetallic interface, the present invention provides an electroslag remelting method. The device and method of the bimetallic composite roll change the position of the high temperature zone of the slag pool by adjusting the flow path of the current in the composite roll smelting system, and at the same time liberate the roll core from the power supply circuit so as to prevent it from becoming a part of the power supply circuit Extremely, avoiding excessive melting of the roll core surface, which not only improves the uniformity of the bimetal bonding interface but also effectively improves its bonding quality

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