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Method for eliminating unit marks through start and stop of unit

A start-stop, unit technology, applied in the field of metallurgy, to achieve the effect of efficient and fast stamping, reducing the amount of degraded products, and eliminating stamping

Active Publication Date: 2021-12-10
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is significantly different from this patent by adjusting the furnace temperature, strip tension and speed to eliminate the strip marks in the annealing furnace, and this patent does not include how to eliminate the marks caused by the tempering machine

Method used

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  • Method for eliminating unit marks through start and stop of unit
  • Method for eliminating unit marks through start and stop of unit
  • Method for eliminating unit marks through start and stop of unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Production steel type: DC04

[0041] Specifications: 1*1300mm.

[0042] When the unit finds that there is scorching in the furnace, in order to reduce the production of defective products, the speed must be reduced to the minimum process speed of 50m / min. The tension is reduced from 7.8KN to 5.4KN, and the belt temperature is reduced to 800°C to meet the minimum annealing temperature. After the belt temperature drops to the minimum annealing temperature of 800°C, increase the tension of the hot section of the annealing furnace to 10.2KN. After the tension in the furnace area is stable, increase the furnace speed to 150m / min. After the speed is stable, press the quick stop button in the furnace area to stop the annealing furnace quickly. After the speed of the furnace zone is 0, the tension in the furnace zone is removed, and the tension is rebuilt to 10.2KN after the tension is completely removed. After the tension is stable, the furnace area directly increases the s...

Embodiment 2

[0044]Production steel type: DC01

[0045] Specification: 1*1100mm

[0046] When the unit finds that there is scorching in the furnace, in order to reduce the production of defective products, the speed must be reduced to the minimum process speed of 50m / min. The tension is reduced from 7.7KN to 5.2KN, and the belt temperature is reduced to 760°C to meet the minimum annealing temperature. After the belt temperature drops to the minimum annealing temperature of 760°C, increase the tension of each section of the annealing furnace to 9.8KN. After the tension in the furnace area is stable, increase the furnace speed to 150m / min. After the speed is stable, press the quick stop button in the furnace area to stop the annealing furnace quickly. After the speed of the furnace zone is 0, the tension in the furnace zone is removed, and the tension is rebuilt to 9.8KN after the tension is completely removed. After the tension is stable, the furnace area directly increases the speed to ...

Embodiment 3

[0048] Production steel type: DC03

[0049] Specification: 1.2*1300mm

[0050] When the unit finds that the skin-passing machine is printing, firstly, the height of the front and rear anti-wrinkle rollers of the skin-passing machine will be increased from 130mm and 140mm to 160mm and 170mm, and the elongation will be increased from 0.5% to 0.6%. Increased from 70.5KN to 84.5KN. The speed of the tempering machine reciprocates between 30-550mm and starts and stops quickly. After repeated operations for more than 5 times, observe the disappearance of the printing defects at the exit of the tempering machine.

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Abstract

The invention discloses a method for eliminating unit marks through start and stop of a unit, which comprises the following steps: when the unit finds out in-furnace marks, reducing the speed to the lowest process speed, reducing the tension of each section of a furnace area by 30-50%, and then reducing the strip temperature to meet the lowest annealing temperature; increasing the tension of each section of the annealing furnace after the strip temperature is reduced to the minimum annealing temperature; after the tension of the furnace area is stable, increasing the furnace speed, and directly pressing a furnace area quick-stop button; when the speed of the strip steel is 0, releasing the tension of the furnace area released and then building again, directly increasing the speed of the furnace area after the tension is stable, and eliminating the marks in the furnace after reciprocating for several times; and after the press marks of a temper mill are found in the unit, firstly, increasing the heights of anti-wrinkling rollers in front of and behind the temper mill, increasing the elongation percentage by 0.1%, increasing the speed of the temper mill and decreasing back and forth or rapidly starting and stopping within 30-550m / min, and eliminating foreign matters on the surfaces of the rollers. According to the method, the marks of the furnace roller in the furnace and the roller of the temper mill are eliminated under the conditions that the furnace is opened without shutdown and the roller of the temper mill is not replaced, the defect treatment time is shortened, and the generation amount of degraded products is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and in particular to a method for eliminating a unit's mark by starting and stopping the unit. Background technique [0002] The cold-rolling continuous annealing unit is composed of a series of large-scale single equipment, and the strip steel is processed sequentially by these process equipment to form the final cold-rolled product. Different quality defects will appear in the process of large-scale equipment processing, especially the annealing furnace and tempering mill have more defects, and are difficult to deal with due to working conditions. It has become a high-quality and stable cold-rolled continuous annealing unit. A difficult problem in the production process. Through proficiency in the production process and continuous exploration and breakthrough of equipment limit capabilities, a method of adjusting the tension and operating speed of the unit to change the friction between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D1/26C21D11/00
CPCC21D9/564C21D1/26C21D11/00
Inventor 孙帅王汝飞王洋王锦波杨增荣江波刘成群李晓许铭王永新刘新宇
Owner SD STEEL RIZHAO CO LTD
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