A method for accurate determination of thickness and quality of hot-rolled strip steel
A judging method and technology of hot-rolled strip steel, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as poor thickness quality, judgment of scrap, unsatisfactory thickness quality, etc., and achieve the effect of accurate judgment
Active Publication Date: 2020-07-21
SHANGHAI MEISHAN IRON & STEEL CO LTD
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[0011] 2) If the measured values of the full-length thickness of the strip are concentrated near the tolerance line, and the fluctuation is gentle, even if the measured data of the full-length thickness is outside the tolerance line, the hit rate is 0%, and the use effect of downstream users will not be greatly affected. impact, but it will be directly judged to be scrapped during hot rolling production, that is, a single hit rate cannot fully reflect the actual thickness quality of the strip, and the strip steel with a poor hit rate may not necessarily have poor thickness quality;
[0012] 3) Before the finish rolling exit thickness detector obtains the actual value, the strip head thickness accuracy depends on the production operation status and the accuracy of the roll gap setting model, and the head thickness accuracy affects the control strategy of AGC, which in turn affects the strip steel Thickness accuracy over the entire length
However, its thickness and quality can no longer meet the actual needs of downstream users, and it needs to be cut or downgraded.
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[0059] Below in conjunction with specific embodiment, further illustrate the present invention, it should be understood that following specific embodiment is only for illustrating the present invention and is not intended to limit the scope of the present invention.
[0060] Taking the hot rolling production grade of QStE420TM, the thickness specification of 3.07mm, and the width specification of 1160mm in an iron and steel company as an example, the specific implementation of this patent is introduced.
[0061] Step 1: Obtain the measured value of the thickness of each point of the strip's full length from the thickness detection instrument, as shown in Table 3, where the serial number is the total number of points of this type of steel obtained by the detection instrument, and the entire coil of strip steel is obtained during the production process. 812 measured values of thickness, the length is the strip length corresponding to each point; the thickness is the measured va...
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The invention provides a hot-rolled strip steel thickness quality accurate determination method. The method includes the following steps: step 1, obtaining the thickness measured value of each point of the full length of strip steel from a thickness detection instrument of a finish rolling outlet; step 2, calculating the Boolean value b of grade determination; step 3, calculating the Boolean valueb<head> of grade determination; step 4, calculating the Boolean value b<dead> of grade determination; and step 5, obtaining a hot-rolled strip steel thickness quality accurate determination result byintegrating value situations of the Boolean value b, b<head> and b<dead> of grade determination. Thus, effective and accurate determination on hot-rolled strip steel thickness quality can be realized, and the method can provide beneficial helps for the quality improvement and early warning of enterprises.
Description
Technical field: [0001] The invention relates to a method for accurately judging the thickness and quality of hot-rolled strip steel, which belongs to the technical field of cold-rolling process control. Background technique: [0002] Under the environment of excess steel production capacity, the industry market competition is becoming increasingly fierce, and higher requirements are put forward for product quality and performance. The thickness accuracy of hot-rolled strip steel is an important indicator of the quality of the final product. The reasons for the thickness error of the finished strip steel are very important. Complicated, from heating to finish rolling, post-process leveling, etc., almost all processes may produce thickness errors, which can be roughly divided into the following categories: [0003] 1) Rolling factors, such as: uneven temperature distribution of slab, geometric dimension error, chemical composition segregation and uneven deformation during rol...
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IPC IPC(8): B21B37/18B21B38/04
CPCB21B37/18B21B38/04
Inventor 夏小明张奉贤王进张萃孙明军
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD