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Rolling control method that can reduce the influence of heating furnace walking beam watermark on the thickness of finished product

A technology of finished product thickness and control method, applied in rolling mill control device, metal rolling, metal rolling, etc., to reduce quality loss, reduce thickness fluctuation, and ensure the accuracy of finished product thickness

Active Publication Date: 2017-06-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no thickness control measure specifically aimed at the influence of watermarks, but watermarks are regarded as a typical step interference factor and adjusted in the thickness feedback system

Method used

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  • Rolling control method that can reduce the influence of heating furnace walking beam watermark on the thickness of finished product
  • Rolling control method that can reduce the influence of heating furnace walking beam watermark on the thickness of finished product
  • Rolling control method that can reduce the influence of heating furnace walking beam watermark on the thickness of finished product

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Embodiment Construction

[0048] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] In the automatic system of multi-point setting and rolling force AGC based on model process control, the present invention establishes a watermark influence estimation model based on information such as the furnace time, size, and steel type of the slab heating furnace, and pre-calculates the watermark The relative position of the point and the estimated value of the influence on the rolling force give the AGC a more reasonable pre-set rolling force target and initial roll gap, thereby reducing the adjustment amount of the AGC system, thereby achieving the purpose of reducing the thickness fluctuation affected by the watermark.

[0050] Therefore, the present invention provides an automatic rolling thickness control method for a medium and heavy plate mill that reduces the influence of the watermark of the walking beam o...

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Abstract

The invention discloses a rolling control method capable of lowering the influence of watermarks of walking beams of a heating furnace on the thickness of finished products. The method is characterized by including the following steps that 1, the number of the walking beams in the heating furnace and the size of the heating furnace are detected; 2, the number of watermark points and the position of each watermark point are calculated according to the number of the walking beams and the size of the heating furnace; 3, the watermark influence coefficient of each watermark point for rolling force is calculated; and 4, actual rolling force of the watermark points is calculated according to the watermark influence coefficients. By the adoption of the technical scheme, the influence of the watermarks of the walking beams of the heating furnace on the thickness of finished moderately-thick plates can be lowered, and especially, the thickness fluctuation caused by the watermarks can still be effectively relieved under the condition of short time in the heating furnace; and the hourly output of thick plates and the thickness and accuracy of the finished products can be guaranteed, and quality losses are reduced.

Description

technical field [0001] The invention relates to a thickness control method of a thick plate rolling mill, and more specifically relates to a rolling control method which can reduce the influence of the watermark of the walking beam of the heating furnace on the thickness of the finished product. Background technique [0002] There are several factors affecting the thickness of hot-rolled steel plates for medium and heavy plates, including changes in steel plate thickness caused by uneven temperature of incoming slabs. One of the reasons for the uneven temperature of incoming slabs is the influence of watermarks. Watermark, also known as furnace bottom black mark or heating furnace black mark, is the local cold and hard area in the length direction of the steel plate, which is caused by the contact between the slab and the support at the bottom of the heating furnace in the heating furnace. It can be seen that the color of this area of ​​the slab is darker. The uneven tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16
Inventor 苗雨川王全胜
Owner BAOSHAN IRON & STEEL CO LTD
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