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A Method for Reducing Plate Defects of Dry Levelers

A technology of plate shape defect and leveling machine, applied in the direction of temperature control, contour control, etc., can solve the problems of insufficient leveling ability of equipment, low first pass rate, vibration roll marks, etc., and achieve the effect of optimizing the SPM production process

Active Publication Date: 2022-07-08
鞍钢联众(广州)不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The SPM production line (dry-type twin-roller leveling machine) of the cold-rolling bright factory used the control method of fixed rolling force + fixed tension to carry out rolling in the past production, resulting in a pass rate of plate shape and AE value (yield point elongation) low, and extensive management of rolls and roll bearings, resulting in insufficient equipment leveling capabilities and new vibration roll mark defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] A method of reducing board shape defects in a dry screed, comprising:

[0031] 1. Use 0.4mm steel strip to calibrate the standard elongation, set elongation standards of different thicknesses, and use (rolling force + tension + reference elongation) joint control to roll in production, thereby improving the stability of the product;

[0032] After changing the axial rollers of the dry double-roller leveler of the quenching and tempering finishing line SPM each time, first use the steel strip with a relatively stable production process of 430 steel with a thickness of 0.4mm to measure the roll diameter by fine-tuning, and adjust the elongation rate. Corrected at 0.25% ± 0.03%, and then integrated the historical data and the elongation value of the final product inspection to design different elongation correction reference values ​​for steel plates of different thicknesses:

[0033] ①The thickness of 430 steel grade is 0.37~0.88mm, and the standard elongation is >0.25%; ...

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PUM

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Abstract

The invention relates to a method for reducing the plate shape defects of a dry leveling machine. The standard elongation is calibrated by using a steel strip with a thickness of 0.4±0.1 mm for the 430 steel grade, so that the standard elongation is controlled at 0.25%±0.03%; for the 430 steel grade , The temperature of the resistance heating zone of the vertical bright annealing furnace is controlled according to the process speed TV. When TV = 15 to 18, the temperature is controlled at 940 ° C to 990 ° C, and the roll crown of the quenched and tempered finishing line with a thickness of 0.37 to 0.68mm is produced. It is 0.54-0.56mm, and the crown of the rolls of the quenching and finishing line for producing thin plates with a thickness of 0.68-0.88mm is 0.36-0.55mm. The advantages of the present invention are that the ratio of the yield point elongation AE value>0.3 can be reduced to 0.9%, and the occurrence rate of edge wave defects can be reduced to 1.2%.

Description

technical field [0001] The present invention relates to a method for reducing plate shape defects of a dry screed. Background technique [0002] The SPM production line (dry double roll leveler) of the cold rolling bright factory used the control method of fixed rolling force + fixed tension for rolling in the previous production, resulting in the first pass rate of plate shape and AE value (elongation at yield point) low, and extensive management of rolls and roll bearings, resulting in insufficient leveling capacity of equipment and new vibration roll mark defects. SUMMARY OF THE INVENTION [0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for reducing the shape defects of the dry screed, improve the SPM production process, optimize the use management of rolls and roll bearings, thereby reducing the shape of the steel strip produced. , Yield point elongation AE value, vibration roll mark defect ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/30B21B37/74
CPCB21B37/30B21B37/74
Inventor 谢育涛徐向东王锦春陈萌刘国栋
Owner 鞍钢联众(广州)不锈钢有限公司