Method and system for the open-loop and/or closed-loop control of a heating of a cast or rolled metal product

Patent metadata

Field	Value
Publication number	US-11292040-B2
Application number	US-201615774629-A
Country	US
Kind code	B2
Filing date	Nov 4, 2016
Priority date	Nov 30, 2015
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The invention relates to a method for the open-loop and/or closed-loop control of a heating of a cast or rolled metal product, comprising the following steps: —determining the total enthalpy of the metal product from a total of the free molar enthalpies (Gibbs free energy) of all phases and/or phase fractions currently present in the metal product; —determining a temperature distribution within the metal product by means of a dynamic temperature calculation model by using the determined total enthalpy; and —open-loop and/or closed-loop controlling of the heating of the metal product according to at least one initial variable of the temperature calculation model.

First claim

The invention claimed is:

1. A system for heating a cast or rolled metal product, comprising:
at least one furnace or at least one heater configured for insertion and heating of the metal product therein in a heating process; and
at least one open loop and/or closed loop control device for open-loop and/or closed-loop control of the heating process, said open loop and/or closed loop control device operatively connected with the furnace or heater and configured to perform a method, comprising the steps of
Determining a total enthalpy of the metal product from a sum of the free molar enthalpies (Gibbs energy) of all phases and/or phase fractions currently present in the metal product;
Determining a temperature distribution within the metal product by means of a dynamic temperature calculation model using the total enthalpy determined;
Open-loop and/or closed-loop controlling of the furnace or the heater to control the heating of the metal product performed by the furnace or the heater as a function of at least one output variable of the temperature calculation model.

2. The system according to claim 1 , characterized in that a density is determined for each phase and phase boundaries between the phases are determined, wherein a density distribution of the metal product is determined based on the densities of the determined phases and the determined phase boundaries.

3. The system according to claim 1 , characterized in that a heat conductivity is determined for each phase and phase boundaries between the phases are determined, wherein a heat conductivity curve of the metal product is determined based on the determined heat conductivities of the phases and the determined phase boundaries.

4. The system according to claim 2 , characterized in that transition temperatures at which a transition from one phase into another is initiated are determined based on the phase boundaries.

5. The system according to claim 1 , characterized in that a length in time of the heating is determined based on a predetermined target temperature distribution within the metal product, a chemical composition of the metal product, and at least one property of a furnace ( 2 ) or heater used for heating.

6. The system according to claim 1 , characterized in that a target temperature required for heating which is applied to the metal product is determined based on a predetermined target temperature distribution of the metal product, a surface temperature of the metal product, a chemical composition of the metal product, at least one property of a furnace ( 2 ) or heater used for heating, and a predetermined conveying speed of the metal product on the one hand or a predetermined waiting time of the metal product on the other hand.

Assignees

• Sms Group Gmbh

Inventors

• Heimann Thomas
• Oudehinken Heinz-Juergen
• Hassell Christoph

Classifications

• G01K2213/00

  Temperature mapping · CPC title

• C21D1/26

  Methods of annealing · CPC title

• B22D11/22

  for cooling cast stock or mould · CPC title

• F27B9/40

  Arrangements of controlling or monitoring devices · CPC title

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title