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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: 2014-03-26
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 selected steel plate ID number is 038682000, steel grade Q550D, steel plate thickness: 50mm; opening cooling temperature 780℃, water cooling time 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; 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; divide the thickness of the steel plate 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 temperature field simulation results performed by the temperature fi...

Embodiment 2

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

[0216] The ultra-fast cooling basic automation system in this embodiment uses a Siemens S7-400 PLC 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 the 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: using SIMATIC STEP7 application software.

[0217] The ultra-fast cooling process automation system o...

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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 automatic control of steel rolling, and particularly relates to a method for coupling control of the temperature field in the ultra-fast cooling process after the rolling of medium and heavy plates. Background technique [0002] In the cooling process of the plate after rolling, the 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 for the production of new ideas such as cooling paths proposed by many researchers. The application lays a solid foundation. Numerical simulation methods for temperature field simulation during the cooling process of medium and heavy plates mainly include analytical method, finite difference method and finite element method. Due to the time variability of industrial site environmental factors during the cooling process of the medium and heavy plates, the temperature field mod...

Claims

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Application Information

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Patent Type & Authority Patents(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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