Method of detecting chattering in cold rolling mill, chattering detecting device for cold rolling mill, cold rolling method, cold rolling mill, and method of manufacturing steel sheet

Patent metadata

Field	Value
Publication number	US-12390846-B2
Application number	US-202118276095-A
Country	US
Kind code	B2
Filing date	Oct 29, 2021
Priority date	Feb 15, 2021
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

A method of detecting chattering in a cold rolling mill, the method includes: a step of predicting occurrence of chattering during rolling of a material to be rolled, by inputting second multidimensional data to a prediction model, the second multidimensional data having been generated based on condition data corresponding to array data related to the material to be rolled, and the prediction model having been trained with an explanatory variable and an objective variable, the explanatory variable being first multidimensional data generated based on one-dimensional array data representing a past rolling record of rolling of rolled materials by means of a cold rolling mill, and the objective variable being a past record of occurrence of chattering corresponding to the past rolling record.

First claim

The invention claimed is:

1. A method of detecting chattering in a cold rolling mill, the method comprising:
a step of predicting occurrence of chattering during rolling of a material to be rolled, by inputting second multidimensional data to a prediction model,
the second multidimensional data having been generated based on condition data corresponding to array data related to the material to be rolled, and
the prediction model having been trained with an explanatory variable and an objective variable,
the explanatory variable being first multidimensional data generated based on one-dimensional array data representing a past rolling record of rolling of rolled materials by means of a cold rolling mill, and
the objective variable being a past record of occurrence of chattering corresponding to the past rolling record.

2. The method of detecting chattering in the cold rolling mill according to claim 1 , wherein
the condition data are one-dimensional array data representing rolling conditions for the material to be rolled, or temporal change of an operation state of the cold rolling mill in rolling of the material to be rolled, and
the first multidimensional data and the second multidimensional data are data resulting from connection of the condition data or the data resulting from shifting of the condition data in a time direction, in a first direction and/or a second direction.

3. The method of detecting chattering in the cold rolling mill according to claim 2 , wherein a time pitch in a case where the condition data are shifted in the time direction is equal to or less than one second (but not including 0 seconds).

4. The method of detecting chattering in the cold rolling mill according to claim 1 , wherein
the condition data are one-dimensional array data representing signal intensity in FFT, and
the first multidimensional data and the second multidimensional data are data resulting from connection of the condition data or the condition data collected at time intervals, in a first direction and/or a second direction.

5. The method of detecting chattering in the cold rolling mill according to claim 1 , including:
a step of decreasing rolling speed of the material to be rolled by the cold rolling mill in a case where chattering has been predicted to occur.

6. The method of detecting chattering in the cold rolling mill according to claim 2 , including:
a step of decreasing rolling speed of the material to be rolled by the cold rolling mill in a case where chattering has been predicted to occur.

7. The method of detecting chattering in the cold rolling mill according to claim 3 , including:
a step of decreasing rolling speed of the material to be rolled by the cold rolling mill in a case where chattering has been predicted to occur.

8. The method of detecting chattering in the cold rolling mill according to claim 4 , including:
a step of decreasing rolling speed of the material to be rolled by the cold rolling mill in a case where chattering has been predicted to occur.

9. The method of detecting chattering in the cold rolling mill according to claim 1 , wherein
the cold rolling mill is a cold tandem rolling mill including plural rolling stands and includes a first rolling oil supply system that supplies first emulsion rolling oil to each of the rolling stands and a second rolling oil supply system that supplies second emulsion rolling oil having a concentration different from that of the first emulsion rolling oil to some of the rolling stands, and
the method includes a step of changing amount of supply of the second emulsion rolling oil from the second rolling oil supply system in a case where chattering has been predicted to occur.

10. The method of detecting chattering in the cold rolling mill according to claim 2 , wherein
the cold rolling mill is a cold tandem rolling mill including plural rolling stands and includes a first rolling oil supply system that supplies first emulsion rolling oil to each of the rolling stands and a second rolling oil supply system that supplies second emulsion rolling oil having a concentration different from that of the first emulsion rolling oil to some of the rolling stands, and
the method includes a step of changing amount of supply of the second emulsion rolling oil from the second rolling oil supply system in a case where chattering has been predicted to occur.

11. The method of detecting chattering in the cold rolling mill according to claim 3 , wherein
the cold rolling mill is a cold tandem rolling mill including plural rolling stands and includes a first rolling oil supply system that supplies first emulsion rolling oil to each of the rolling stands and a second rolling oil supply system that supplies second emulsion rolling oil having a concentration different from that of the first emulsion rolling oil to some of the rolling stands, and
the method includes a step of changing amount of supply of the second emulsion rolling oil from the second rolling oil supply system in a case where chattering has been predicted to occur.

12. The method of detecting chattering in the cold rolling mill according to claim 4 , wherein
the cold rolling mill is a cold tandem rolling mill including plural rolling stands and includes a first rolling oil supply system that supplies first emulsion rolling oil to each of the rolling stands and a second rolling oil supply system that supplies second emulsion rolling oil having a concentration different from that of the first emulsion rolling oil to some of the rolling stands, and
the method includes a step of changing amount of supply of the second emulsion rolling oil from the second rolling oil supply system in a case where chattering has been predicted to occur.

13. A cold rolling method, including:
a step of rolling a rolled material by using the method of detecting chattering in the cold rolling mill according to claim 1 .

14. A method of manufacturing a steel sheet, the method including:
a cold rolling process of cold rolling a rolled material by using the cold rolling method according to claim 13 ; and
an annealing process of performing annealing for the rolled material that has been cold rolled in the cold rolling process, at a soaking temperature of 600 to 950° C. and in-furnace tension of 0.1 to 3.0 kgf/mm 2 .

Assignees

• Jfe Steel Corp

Inventors

• Fujita Noriki
• Kitamura Takuya
• Arakawa Tetsuya

Classifications

• B21B1/28

  by cold-rolling {, e.g. Steckel cold mill} · CPC title

• B21B38/008 Primary

  Monitoring or detecting vibration, chatter or chatter marks · CPC title

• B21C51/00

  Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F · CPC title

• B21B1/22

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

• B21B2275/04

  Roll speed · CPC title