Steering control apparatus for rolled plates

• US 5,172,579 A
• Filed: 05/21/1991
• Issued: 12/22/1992
• Est. Priority Date: 07/31/1989
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nojima, Akira
• Primary Examiner(s): Larson, Lowell A.
• Assistant Examiner(s): SCHOEFFLER, THOMAS
• Application Number:
  US07/700,178
• Time in Patent Office: 581 Days
• Field of Search: 72/8-12, 72/17, 72/20, 72/241.2, 72/241.4, 72/245, 364/148, 364/152, 364/153, 364/157, 364/158, 364/160-163, 364/472
• US Class Current: 72/8.7
• CPC Class Codes: B21B 37/68 Camber or steering control for strip, sheets or plates, e.g. preventing meandering
• CPC Class Codes: B65H 23/032 Controlling transverse register of web
• CPC Class Codes: B65H 2515/31 Tensile forces
• CPC Class Codes: B65H 2557/22 Fuzzy logic
• CPC Class Codes: Y10S 706/90 Fuzzy logic

Abstract

A steering control apparatus for a rolled plate (1) rolled by a rolling mill (2), and which has a means (15) for obtaining by means of fuzzy inference a leveling amount of its polarity (15A) of the rolling mill for the snaking control of the rolled plate, in accordance with a tension difference (11A) between the operator side tension and the drive side tension of the rolled plate and a rolling load difference (13A) between the operator side rolling load and the drive side rolling load of the rolling mill. In accordance with the leveling amount and polarity obtained by means of the fuzzy inference, the leveling amount of the rolling mill (2) is regulated independently for the operator side and drive side.

Claims

1. A steering control apparatus for steering a rolled plate comprising:

tension detecting means for detecting an operator side tension of a plate rolled by a rolling mill and a drive side tension thereof;

rolling load detecting means for detecting an operator side rolling load of said rolling mill and a drive side rolling load thereof;

first calculation means for calculating a tension difference between said operator side tension and said drive side tension, respectively detected by said tension detecting means;

second calculation means for calculating a rolling load difference between said operator side rolling load and said drive side rolling load, respectively detected by said rolling road detecting means;

third calculation means for obtaining by means of a fuzzy inference scheme, a leveling amount and its polarity of said rolling mill for the steering control of said rolled plate, on the basis of two inputs, said two inputs being said tension difference calculated by said first calculation means and said rolling load difference calculated by said second calculation means; and

means for regulating said leveling amount of said rolling mill independently for the operator side and the drive side, in accordance with said leveling amount and the polarity calculated by said third calculation means.

2. A steering control apparatus according to claim 1, wherein said third calculation means comprises:

fuzzy inference means for calculating, by means of a fuzzy control scheme, a tension difference correction factor for the steering control of said rolled plate, on the basis of both said tension difference calculated by said first calculation means and said rolling load difference calculated by said second calculation means;

multiplication means for calculating a corrected tension difference by multiplying said tension difference calculated by said first calculation means by said tension difference correction factor calculated by said fuzzy inference means; and

proportional integration calculation means for obtaining said leveling amount and polarity of said rolling mill by performing a proportional integration calculation of said multiplication means.

3. A steering control apparatus according to claim 1, further comprising a dead zone device provided at an output side of said first calculation means for setting a dead zone for said tension difference calculated by said first calculation means.

4. A steering control apparatus according to claim 1, further comprising a dead zone device provided at an output side of said second calculation means for setting a dead zone for said rolling load difference calculated by said second calculation means.

5. A steering control apparatus according to claim 1, further comprising limiter means provided at an output side of said third calculation means for limiting an upper/lower limit of an output absolute value.