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Method for controlling medium plate quenching technology

A control method and process technology, applied in heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve the problem of weak theoretical basis for heat transfer coefficient calculation, gap between model establishment basis and calculation accuracy, and accurately describe the steel plate water cooling temperature drop process And other issues

Active Publication Date: 2012-04-04
NORTHEASTERN UNIV
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Problems solved by technology

In addition, most of the models established by this method are empirical formulas, and the principle of water-cooled heat transfer has not been studied in depth. The theoretical basis for the calculation of heat transfer coefficients is not strong. There is a certain gap between the foundation of the model and the calculation accuracy

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  • Method for controlling medium plate quenching technology
  • Method for controlling medium plate quenching technology
  • Method for controlling medium plate quenching technology

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Embodiment Construction

[0034] The present invention is a method for controlling the quenching process of medium and thick plates, which is suitable for the quenching of steel plates on a quenching machine. figure 1 , including the following steps:

[0035] The first step 101 is to read the steel plate plan information stored in the factory-level MES or plan management system database according to the PLC tracking trigger, including steel plate specification, steel type, plate number, heat treatment mode, alloy composition and target process parameters; and then according to the plan information Call the model parameters in the database of the quenching control system, including steel plate thermophysical parameters (specific heat, thermal conductivity, linear expansion coefficient and density), default values ​​of process parameters and combination classification information (steel group number, classification number and layer number) ;Call the cooling method calculation model according to the plan...

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Abstract

The invention discloses a method for controlling a medium plate quenching technology. The method comprises formulation of steel plate quenching strategies, model calculation of quenching parameters and formulation of quenching regulations, namely comprises the following steps of: according to steel plate planning information and model parameter information, automatically selecting one of four quenching manners, namely water cooling, haze cooling, strong wind cooling and air cooling, and formulating corresponding cooling strategies; calculating a comprehensive heat exchange coefficient of the surface of the steel plate according to the structural size of cooling equipment and control parameter initialized cooling parameters; calculating the temperature drop of the steel plate according to a heat conducting equation by combining a thermo-physical parameter model, and continually optimizing the quenching parameters till the cooling rate and the final cooling temperature reach target values; and finally performing structure property analysis and cooling regulation formulation, and sending the calculated regulations to a database, a programmable logic controller (PLC) and an interface. The method is flexible in cooling strategy formulation and high in cooling regulation calculation precision, and well solves the problems that the control precision of the medium plate quenching process is low, the performance of the quenched steel plate is unqualified and the like.

Description

technical field [0001] The invention relates to the technical field of heat treatment of medium and thick plates, in particular to a method for controlling the quenching process of medium and thick plates. Background technique [0002] The quenching process of medium and thick plates involves processes such as temperature drop, deformation, and structural transformation, and has the characteristics of multi-field coupling and complex nonlinear relationships. The establishment of the quenching mathematical model has the following technical difficulties: ①Complicated modeling and poor adaptability; ②Difficult to measure relevant parameters; ③Difficult to accurately determine the boundary conditions of the model; ④Difficult to solve the model. Imported medium and thick plate quenching equipment does not have a complete quenching model control system for each cooling mode of the quenching machine, and there are still certain deficiencies in the scientific and reasonable formulat...

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Application Information

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IPC IPC(8): C21D1/18C21D9/52C21D11/00
Inventor 付天亮王昭东袁国王国栋李勇韩毅
Owner NORTHEASTERN UNIV
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