Method for forecasting and controlling additional shape waves in steel coil unloading and cooling process

A cooling process, steel coil technology, applied in the direction of electrical program control, total factory control, total factory control, etc.

Inactive Publication Date: 2012-08-08
唐山市榕泽钢材加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, the problem of additional wave shape during the cooling process of steel coils on site was usually only discovered after th

Method used

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  • Method for forecasting and controlling additional shape waves in steel coil unloading and cooling process
  • Method for forecasting and controlling additional shape waves in steel coil unloading and cooling process
  • Method for forecasting and controlling additional shape waves in steel coil unloading and cooling process

Examples

Experimental program
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Effect test

Embodiment 1

[0053] This embodiment calculates the distribution of the cooling stress field of 150 layers of hot-rolled steel coils, namely . Now take carbon steel with a specification of 5mm×1200mm as an example to describe the specific implementation process of calculating the additional wave shape prediction during the unloading and cooling process of hot-rolled steel coils. The calculation results are shown in the attached Figure 5 , 6 , 7, 8 shown.

[0054] First, in step 1, the variety specifications and process parameters of the strip steel are collected, mainly including: Poisson's ratio of the strip steel material , Strip elastic modulus (Where T is the coil temperature value, unit ), the yield limit of the strip , strip width , The correction coefficient for the difference between theory and reality in the formula of steel coil tightness coefficient , the maximum value of strip surface roughness , coefficient of friction , Coil layers , Strip element number ...

Embodiment 2

[0089] In order to further illustrate the basic idea of ​​the present invention, the distribution of the cooling stress field of 1000 layers of cold-rolled steel coils is calculated as an example of carbon steel with a specification of 1mm × 1000mm, namely . Describe the specific implementation process of calculating the additional wave shape forecast in the unloading and cooling process of cold-rolled steel coils. The calculation results are shown in the attached Figure 9 , 10 , 11, 12 shown.

[0090] First, in step 1, the variety specifications and process parameters of the strip steel are collected, mainly including: Poisson's ratio of the strip steel material , Strip elastic modulus (Where T is the coil temperature value, unit ), the yield limit of the strip , strip width , The correction coefficient for the difference between theory and reality in the formula of steel coil tightness coefficient , the maximum value of strip surface roughness , coefficient of...

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Abstract

The invention discloses an integrated control method for additional shape waves in a steel coil unloading and cooling process. According to the method, features of devices and technologies in a steel coil coiling process are fully combined, anisotropy of the steel coil is considered for the first time, and a polynomial curve fitting mode is adopted to set a radial stress distribution of the inside of the steel coil, and then a circumferential stress, a friction stress and compactness coefficients of the interior of the steel coil are deduced. A rapid calculation method for thermal stress in the steel coil unloading and cooling process is established by means of a yield condition judgment. The method has the advantages that by means of a solving of a stress field of the steel coil cooling, and possible additional shape waves in the steel coil cooling process are forecasted, thereby by means of adjusting coiling process, producing of the additional shape waves of the steel coil can be controlled and the steel coil coiling quality can be improved.

Description

technical field [0001] The invention relates to a steel coil coiling quality control technology, in particular to a comprehensive control method for additional wave shapes in the coil unloading and cooling process. Background technique [0002] The internal stress of the steel coil will change greatly during the unloading and cooling process. Taking hot rolling as an example, the temperature of the steel strip after coiling is about 600 degrees Celsius. Because the cooling speed inside and outside the steel coil is different, the cooling shrinkage and deformation of each point inside the steel coil are different, so that the internal stress of the steel coil changes greatly. , the local stress may exceed the yield limit of the strip, causing local plastic deformation of the strip, resulting in additional waves. Although the internal temperature of the cold-rolled steel coil is about 120 degrees Celsius after unloading, there are similar problems. In the past, on-site probl...

Claims

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Application Information

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IPC IPC(8): G05B19/418B21C47/02
CPCY02P90/02
Inventor 白振华司红鑫李龙华李鹏蔡江哲
Owner 唐山市榕泽钢材加工有限公司
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