Operating method for a production line with prediction of the command speed

Patent metadata

Field	Value
Publication number	US-9630227-B2
Application number	US-201113696376-A
Country	US
Kind code	B2
Filing date	Mar 9, 2011
Priority date	May 6, 2010
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Before a first strip point is fed into a production line, an actual energy content at a location in front of the production line and a setpoint energy content at a location behind the production line are received for a first strip point, second strip point, and third strip point. The third strip point, followed by the first strip point, followed by the second strip point, are fed into the production line. A command variable for the first strip point and second strip point(s) is determined prior to feeding in the first strip point. Each command variable is determined based on (a) the actual value and the setpoint value of the strip point currently entering the production line, and (b) the actual value and the setpoint value of at least one strip point having already entered.

First claim

What is claimed is:

1. An operating method for a production line for rolling a strip, the method comprising:
at a time point before a first strip point of the strip is fed into the production line, a control computer of the production line receiving an actual value and a setpoint value for each of the first strip point, a number of second strip points, and a number of third strip points of the strip,
wherein for each first, second, and third strip point, the respective actual value describes energy content of that strip point either by temperature or enthalpy, and the respective setpoint value is a setpoint for the energy content of that strip point,
wherein for each first, second, and third strip point, the respective actual value relates to a location in front of the production line and the respective setpoint value relates to a location behind the production line,
feeding the third strip points into the production line, followed by the first strip point, followed by the second strip points,
prior to feeding the first strip point into the production line, the control computer determining a command variable for each of the first strip point and at least a subset of the second strip points based on a determining rule specific to the respective strip point,
wherein each respective command variable is characteristic of a command speed at which the control computer operates the production line at a time when the respective strip point is fed into the production line, and
the control computer determining the respective command speed for each respective strip point based on the command variable determined for that strip point, and the control computer operating the production line at the respective command speed at the time when the respective strip point is fed into the production line,
wherein the determining rule for determining each respective command variable is determined based at least on (a) the actual value and the setpoint value of the respective strip point currently entering the production line, and (b) the actual value and the setpoint value of at least one strip point that has already entered the production line,
wherein for each of at least a subset of the strip points, the control computer:
determines a respective expected value of the temperature or enthalpy of an expected energy content that is expected for the respective strip point, at a location behind the production line to which the currently corresponding setpoint value relates, as a result of the command speeds at which the control computer operates the production line during the entire passage of the respective strip point through the production line,
receives, after the passage of the respective strip point through the production line, a measured value of the temperature or enthalpy of an actual energy content of the respective strip point at the location behind the production line to which the corresponding setpoint value relates, and
automatically corrects the command variable determined for the respective strip point based on a comparison between the expected energy content and the actual energy content
wherein based on the comparison, the control computer automatically corrects only those command variables that were determined for the strip points having a minimal distance from the entrance to the production line at the time point of the correction.

2. The operating method of claim 1 ,
wherein the control computer determines each of the command variables based on a multiplicity of individual command variables,
wherein each individual command variable relates to one of the strip points whose actual value and setpoint value are input into the determination of the respective command variable,
wherein the control computer determines the command variable for each strip point such that a respective expected value matches the corresponding setpoint value, and
wherein the respective expected value is either the temperature or enthalpy representing the energy content that the respective strip point would reach, at a location behind the production line to which the currently corresponding setpoint value relates, if the control computer were to operate the production line at a command speed corresponding to the individual command variable during the entire passage of the respective strip point through the production line.

3. The operating method of claim 2 , wherein:
the control computer creates a data field in which, for multiple possible command speeds and possible actual values, the control computer stores the expected value that is produced for the respective possible actual value in the case of the respective possible command speed, and the control computer determines the command variables for the strip points using the data field.

4. The operating method of claim 3 , wherein the control computer:
determines, for at least a subset of the strip points, a respective expected value of the temperature or enthalpy of an expected energy content that is expected for the respective strip point, at a location behind the production line to which the currently corresponding setpoint value relates, as a result of the command speeds at which the control computer operates the production line during the entire passage of the respective strip point through the production line,
receives, after the passage of the respective strip point through the production line, a measured value of the temperature or enthalpy of an actual energy content of the respective strip point at that location behind the production line to which the corresponding setpoint value relates,
automatically adapts a model of the production line based on a comparison between the expected thermal energy content and the actual thermal energy content, and
adapts the model of the production line by adding an offset to the actual values when the data field is used, scaling the command speeds using a scaling factor and/or adding an offset to said command speeds and/or adding an offset to the expected values that were determined using the data field.

5. The operating method of claim 1 , wherein for each strip point whose command variable is determined by the control computer, said control computer:
determines an effective actual value based on the actual values that used in the determination of the command variable for the respective strip point, and determines an effective setpoint value based on the setpoint values used in the determination of the command variable for the respective strip point,
determines an expected value of the temperature or enthalpy of an expected energy content which the respective strip point would reach, at that location behind the production line to which the effective setpoint value relates, if the control computer were to operate the production line at a command speed corresponding to the command variable for the respective strip point during the entire passage of the respective strip point through the production line, and
determines the command variable such that the expected value at that location behind the production line to which the effective setpoint value relates has the effective setpoint value.

6. The operating method of claim 1 ,
wherein when determining the command variables, the control computer initially determines estimated command variables as provisional values,
wherein the control computer determines a respective expected value for the first strip point and at least a subset of the second and third strip points,
wherein each expected value is either the temperature or enthalpy of an expected energy content that the respective strip point would reach, at that location behind the production line to which the currently corresponding setpoint value relates, if the control computer were to operate the production line

Assignees

• Weinzierl Klaus
• Primetals Technologies Germany Gmbh

Inventors

• Weinzierl Klaus

Classifications

• B21B2275/04

  Roll speed · CPC title

• C21D11/00

  Process control or regulation for heat treatments · CPC title

• B21B37/74 Primary

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

• C21D8/0226

  Hot rolling · CPC title

• B21B2275/02

  Speed · CPC title