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-11701696-B2
Application number	US-202217691557-A
Country	US
Kind code	B2
Filing date	Mar 10, 2022
Priority date	Nov 30, 2015
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

A method for open-loop and/or closed-loop control of a heating of a cast or rolled metal product, includes the steps of determining the 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; and open-loop and/or closed-loop controlling of the heating of the metal product as a function of at least one output variable of the temperature calculation model.

First claim

The invention claimed is:

1. A method for open-loop and/or closed-loop control of a heating of a cast or rolled metal product, comprising the steps of:
inserting the metal product into a furnace or heater and heating the metal product in the furnace or heater in a heating process;
with an open loop and/or closed loop control device operatively connected with the furnace or heater and adapted for open-loop and/or closed-loop control of the heating process, performing the following steps
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; and
open-loop and/or closed-loop controlling of the heating of the metal product as a function of at least one output variable of the temperature calculation model.

2. The method of claim 1 , wherein 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 method of claim 1 , wherein 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 method of claim 2 , wherein transition temperatures at which a transition from one phase into another is initiated are determined based on the phase boundaries.

5. The method of claim 1 , wherein 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 or heater used for heating.

6. The method of claim 1 , wherein 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 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
• Hassel Christoph

Classifications

• B21B37/74 Primary

  Temperature control, e.g. by cooling or heating the rolls or the product (B21B37/32, B21B37/44 take precedence) · CPC title

• B21B1/22

  for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) · CPC title

• B22D11/1213

  for heating or insulating strands · CPC title

• B22D11/22

  for cooling cast stock or mould · CPC title

• B22D27/04

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