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Coupling control method for temperature field in process of super-quickly cooling rolled moderate-thick plate

A coupled control, ultra-fast cooling technology, applied in temperature control and other directions, can solve problems such as oscillation

Active Publication Date: 2012-09-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies in the existing technology, the present invention provides a coupling control method for the temperature field of the ultra-fast cooling process after medium-thick plate rolling, which can effectively solve the oscillation problem generated when the finite element method is used for temperature field simulation, and realize ultra-fast cooling of the medium-thick plate. On-line temperature field analysis of rapid cooling process and high-precision setting of cooling process

Method used

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  • Coupling control method for temperature field in process of super-quickly cooling rolled moderate-thick plate
  • Coupling control method for temperature field in process of super-quickly cooling rolled moderate-thick plate
  • Coupling control method for temperature field in process of super-quickly cooling rolled moderate-thick plate

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Embodiment 1

[0205] The ID number of the selected steel plate is 038682000, the steel type is Q550D, the thickness of the steel plate is 50mm; the cooling temperature is 780°C, and the water cooling time is 21S; chemical composition: C: 0.084%; Mn: 1.8%; Cr: 0.02%; Nb: 0.045%; V : 0.051%; Mo: 0.002%; Ni: 0.01%; Ti: 0.016%; Cu: 0.01%; water temperature 24°C; density: 7800kg / m3. Specific heat: obtained from Table 1 according to its chemical composition; thermal conductivity: obtained from Table 2 according to its chemical composition; the water-cooling heat transfer coefficient is taken as the comprehensive water-cooling heat transfer coefficient of the water-cooling process 4000W / (m 2 ·K); time step Δτ=3S; the thickness of the steel plate is divided into 20 finite elements and 21 nodes at equal intervals;

[0206] Table 1 Specific heat table (kJ / kg K)

[0207]

[0208] Table 2 Thermal conductivity table (W / m K)

[0209]

[0210] Based on the above simulation conditions, the temperat...

Embodiment 2

[0215] The control system used in the control method of this embodiment includes the ultra-fast cooling basic automation system, the ultra-fast cooling process automation system, the ultra-fast cooling equipment, the side spray device and the detection instrument. The system structure diagram is as follows Figure 8 shown.

[0216] In this embodiment, the ultra-fast cooling basic automation system adopts a set of Siemens S7-400PLC as the main control unit of the ultra-fast cooling equipment, communicates with the remote I / O module through the Profibus DP network, and the remote I / O module is directly connected to the field instrument through a cable Its hardware includes: one UR1 rack, one power supply PS 40720A, one central processing unit CPU 416-2DP, one communication module CP 443-1, two counter modules FM 451FIX SPEED, and AI, AO modules, DI, DO modules Several; its application software: adopt SIMATIC STEP7 application software.

[0217] The ultra-fast cooling process au...

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Abstract

The invention discloses a coupling control method for a temperature field in a process of super-quickly cooling a rolled moderate-thick plate, belonging to the technical field of automatic steel rolling control. A process automation system acquires a primary data input (PDI) parameter of a steel plate; each water flow density layer is subjected to temperature field simulation by adopting a coupling control algorithm of the temperature field, so that a cooling regulation is set and transmitted to a foundation automation system for exestuation; and furthermore, actually measured data (automatically acquired) of a meter on a rolling line are uploaded to the process automation system, so that the process automation system is triggered to correct and self-learn the cooling regulation. By using the method, specific heat and the temperature field are coupled, so that the problem of oscillation caused when the temperature field in a super-quick cooling process is simulated by the conventional finite element is solved; the temperature field of the moderate-thick plate super-quick cooling process can be resolved on line by successfully applying the coupling control method for the temperature field; and a cooling process can be set at high precision.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automatic control, in particular to a coupling control method for the temperature field of the ultra-fast cooling process after medium-thick plate rolling. Background technique [0002] In the cooling process after plate rolling, a high-precision temperature field model is not only the basis for achieving single control goals such as final cooling temperature and cooling speed, but also can be used for the production of new ideas such as cooling paths proposed by many researchers. Apply a solid foundation. The numerical simulation methods for temperature field simulation in the cooling process of plate after rolling mainly include analytical method, finite difference method and finite element method. Due to the time-varying nature of industrial field environmental factors in the cooling process of plate after rolling, the temperature field model based on the analytical method has a limited ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
Inventor 陈小林王丙兴田勇袁国王昭东王国栋
Owner NORTHEASTERN UNIV LIAONING
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