Stelmor line cooling method of high-speed wire by taking temperature as direct-control parameter

Abstract

The invention discloses a Stelmor line cooling method of a high-speed wire by taking temperature as a direct-control parameter, comprising the steps of: respectively arranging seven infrared thermo detectors at the first to sixth sections and a gathering coil of the Stelmor line and additionally arranging an environment temperature and humidity meter; additionally arranging a computer, an interface, a data collector, a cable and the like to realize integrally reasonable installation; establishing an assorted software system and forming a standard cooling curve and an actual cooling curve of the wire on the Stelmor line; establishing a Stelmor optimal cooling curve prediction model and a Stelmor line fan air volume set prediction model by using neural network technology; deriving the air volume set value of each fan; and eliminating the difference between the actual cooling curve and the standard cooling curve. By means of the invention, a Stelmor dynamic closed loop type cooling control system is established, the bad influences on the intensity caused by the chemical components and the fluctuation of the environment temperature are eliminated, the structure properties of various wire products can be optimized and the accurate control of the structure properties of the wire products is realized.

Description

technical field [0001] The invention relates to the field of metallurgical rolling, in particular to a high-speed wire rod STEOMOR cooling method with temperature as a direct control parameter. Background technique [0002] In the field of metallurgical rolling, the quality requirements for high-speed wire rods are more to meet the performance of the subsequent processes. The quality content specified in the general wire rod delivery technical conditions includes: shape and dimensional accuracy; surface quality and iron oxide scale; cross-sectional quality and metallographic structure; chemical composition and mechanical properties. [0003] The production process characteristics of high-speed wire rod mills can be summarized as continuous, high-speed, twist-free and controlled cooling. Among them, high-speed rolling is the most important process characteristic. Large plate weight, high precision, and superior performance are the product characteristics of high-speed wire ...

AI Technical Summary

Problems solved by technology

[0017] With the wide application of wire rods in major projects, users have put forward higher requirements for the strength and stability of products. Studies have shown that chemical composition and ambient temperature are the main factors affecting strength stability, but the existing process control methods cannot effectively resolve these conflicts

[0018] The chemical composition and ambient temperature are constantly changing, but the parameters such as roller table speed and fan air volume in the current cooling process of hard line products are basically unchanged. Even if the parameters are adjusted, there is a phenomenon that there is a lag or cannot be correctly matched with the composition and ambient temperature changes

This is mainly because the ultimate goal of adjusting the air volume of the fan, the speed of the roller table and the opening and closing of the heat preservation cover is to control the cooling speed of the wire rod on the Stelmore line, but since the Stelmore line has only two temperature points, and the temperature measurement is Inaccurate and has no reference value, so it is difficult to quickly and accurately judge the actual effect of adjusting the air volume of the fan, the speed of the roller table, and the opening and closing of the heat preservation cover. We can only wait for the final mechanical test results of the wire rod

However, the test results lag behind greatly, and some even lag by 1-2 days. When the test results come out, the rolling batch has already been produced, and it cannot form a closed-loop dynamic adjustment. This series of contradictions has led to the inability of the existing process control methods. To realize the dynamic closed-loop adjustment, it is impossible to avoid the influence of chemical composition and ambient temperature on the strength stability

[0019] Although the current cooling control of the Steyrmore line is realized through the air volume of the fan and the speed of the roller table, the selection of this process parameter is not reasonable, and it is an indirect control method.

[0020] 2. It is difficult to optimize the organizational performance of existing products

[0022] 1) Incomplete data collection makes it difficult to carry out systematic and comprehensive analysis and research. The accuracy of the Stelmore line temperature stored in the L2 system cannot be guaranteed, the stored fields are not comprehensive, and the chemical composition, Stelmore temperature and Relevant data such as tensile strength are organically connected, resulting in the inability to conduct systematic and comprehensive analysis

[0023] 2) There are defects in the hardware configuration. There were only two thermometers in the Stelmore line. The number of thermometers was seriously insufficient to reflect the cooling effect of each section, and the temperature measurement value was randomly selected at regular intervals. Often the wire rod The temperature is confused with the roller table temperature and cannot reflect the true temperature of the wire rod

Historical events also show that the existing thermometer configuration cannot detect abnormal conditions such as fan failures, resulting in the appearance of products with unqualified batch performance. Therefore, it is necessary to improve the hardware configuration of the Stelmore line temperature detection

[0024] 3) There is a lack of a control model and precise control cannot be achieved. In order to effectively improve the stability of wire strength, it is necessary to establish a control model for strength stability and find the quantitative relationship between strength and its main influencing factors (chemical composition and ambient temperature). Due to the lack of specialized research and incomplete data, this model cannot be established; 4) There is no special software to support the research and improvement of the Stelmore process. In addition to the lack of hardware, there is also a lack of special software for information display, data acquisition, and model analysis. , cooling adjustment and other work, it is difficult to improve the cooling of the Steyrmore wire and optimize the structure and performance of the product

However, as stated in this patent, the purpose is to improve the cooling strength of the Stelmore wire while solving the problems of lap joint structure and uneven performance

[0026] At present, the Stelmore cooling line is widely used in high-speed wire rod production lines, but the outstanding disadvantages of this process are: on the air-cooled line, the coil density distribution is uneven, the wire density is the largest at the lap joint, and the wire density is the smallest at the center of the coil , so the cooling rate at the overlapping point of the coil is not only lower than that at other positions, but also the initial position of the phase change and the time of the phase change have different degrees of lag

[0027] Although the degree of unevenness can be changed by adjusting the Jialing device or changing the speed of the roller table, the difference in the performance of the same coil of the wire is still large

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