Roll gap control method and device under light or heavy pressure

Abstract

The invention provides a method and device for controlling the roll gap under light reduction or heavy reduction, including: taking the roll gap value of the installed pressing device in the drawing as the initial roll gap value; Carry out calibration to obtain the corresponding relationship between the displacement sensor and the roll gap value; when the pressing is not implemented, the pressing roll works in the hot billet pressure mode, and obtain the rolling gap value of the pressing device in real time through the displacement sensor; set the relative pressure of each pressing roll Reduction amount; when the reduction is implemented, the reduction roller that performs the reduction works in the displacement control mode, and the average value of the roll gap value of the reduction device corresponding to the reduction roller when the reduction is not implemented for the set time As the reference roll gap value of the pressing device, the target roll gap value of the pressing device corresponding to the pressing roller is obtained according to the reference roll gap value and the relative reduction amount; The stroke implements the pressure nip control on the pressure rollers. The above method and device realize the dynamic measurement of the reference roll gap.

Description

technical field [0001] The invention relates to the field of continuous casting, and more specifically, to a method and device for controlling a roll gap under light reduction or heavy reduction. Background technique [0002] Central segregation and V-shaped segregation, that is, the uneven composition of the central area of ​​the slab, are the inevitable products of the solidification process of continuous casting, and are the main defects that cause internal quality problems in continuous casting of billets, and have a great impact on the quality of the slab. In the subsequent treatment process of bearing steel, high carbon hard wire, cord steel, gear steel, etc., due to the inhomogeneous segregation of the center, the network carbide, martensitic structure, banded structure, etc. lead to the core and matrix. Inconsistent performance, uneven hardness, brittle fracture after drawing, broken wire, unqualified flaw detection and other problems. Light reduction / heavy reductio...

AI Technical Summary

Problems solved by technology

Due to the unevenness of the slab, accurate calibration of the roll gap cannot be achieved

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