Hot rolling mills and hot rolling methods

Patent metadata

Field	Value
Publication number	US-12434283-B2
Application number	US-202017914779-A
Country	US
Kind code	B2
Filing date	Apr 27, 2020
Priority date	Apr 27, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A hot rolling mill 1 includes a control apparatus 20 that adjusts an angle formed between an upper-side pair of an upper backup roll 120 A and an upper work roll 110 A and a lower-side pair of a lower backup roll 120 B and a lower work roll 110 B in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. The hot rolling mill 1 is configured such that the work rolls 110 A and 110 B satisfy the condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls 110 A and 110 B, and Lb is the maximum strip width of a rolled material, and the hot rolling mill 1 performs rolling in a state where a bending force is applied to the work rolls.

First claim

The invention claimed is:

1. A hot rolling mill comprising:
a pair of upper and lower work rolls;
a pair of upper and lower backup rolls that support the work rolls;
bending actuators that apply bending forces to the work rolls;
work-roll horizontal actuators that move the work rolls in a horizontal direction;
backup-roll horizontal actuators that move the backup rolls in the horizontal direction; and
an angle control apparatus configured to adjust an angle formed between an upper-side pair of the upper backup roll and the upper work roll and a lower-side pair of the lower backup roll and the lower work roll in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel using the work-roll horizontal actuator and the backup-roll horizontal actuator,
wherein the work rolls satisfy a condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls, and Lb is a maximum strip width of a rolled material.

2. The hot rolling mill according to claim 1 , wherein
the work rolls satisfy a condition that DW/Lb is equal to or smaller than 0.28.

3. The hot rolling mill according to claim 1 , wherein
the work rolls satisfy a condition that DW/Lb is equal to or greater than 0.15 and equal to or smaller than 0.30.

4. The hot rolling mill according to claim 1 , wherein
the angle control apparatus is configured to execute adjustment of angles of the upper-side pair and the lower-side pair during rolling of the rolled material.

5. A hot rolling method by a hot rolling mill including:
a pair of upper and lower work rolls;
a pair of upper and lower backup rolls that support the work rolls;
bending actuators that apply bending forces to the work rolls;
work-roll horizontal actuators that move the work rolls in a horizontal direction; and
backup-roll horizontal actuators that move the backup rolls in the horizontal direction,
the work rolls satisfying a condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls, and Lb is a maximum strip width of a rolled material, the method comprising:
adjusting an angle formed between an upper-side pair of the upper backup roll and the upper work roll and a lower-side pair of the lower backup roll and the lower work roll in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel using the work-roll horizontal actuator and the backup-roll horizontal actuator; and
performing rolling in a state where a bending force is applied to the work rolls.

Assignees

• Primetals Tech Japan Ltd

Inventors

• Sugimoto Tatsunori
• Horii Kenji
• Kuroda Akio
• Sako Akira
• Kanemori Shinya

Classifications

• B21B2269/04

  Work roll bending · CPC title

• B21B2013/025

  Quarto, four-high stands · CPC title

• B21B13/14

  having counter-pressure devices acting on rolls to inhibit deflection of same under load; {Back-up rolls}(counter-pressure devices as such B21B29/00) · CPC title

• B21B13/02

  with axes of rolls arranged horizontally · CPC title

• B21B2001/225

  by hot-rolling · CPC title