Cross angle identification method, cross angle identification device, and rolling mill

Patent metadata

Field	Value
Publication number	US-11192157-B2
Application number	US-201816484321-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Mar 7, 2017
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

The present invention provides a method for identifying an inter-roll cross angle in a rolling mill of four-high or more including at least a pair of work rolls and a pair of backup rolls by, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on the upper side and between rolls of a lower roll assembly including the work roll on the lower side, in a state where a roll gap between the work rolls is put into an open state, detecting vertical roll loads that act in the vertical direction on the rolling support positions on the working side and the driving side of at least one of the backup roll on the upper side or the backup roll on the lower side, and calculating a load difference between the vertical roll loads on the working side and the driving side.

First claim

The invention claimed is:

1. A cross angle identification method for identifying an inter-roll cross angle of a rolling mill,
the rolling mill being a rolling mill of four-high or more that includes a plurality of rolls including at least a pair of work rolls and a pair of backup rolls,
the cross angle identification method comprising:
a roll bending force application step of, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on an upper side and between rolls of a lower roll assembly including the work roll on a lower side, in a state where a roll gap between the work rolls is put into an open state;
a load detection step of detecting vertical roll loads that act in a vertical direction on rolling support positions on a working side and a driving side of at least one of the backup roll on the upper side or the backup roll on the lower side;
a load difference calculation step of calculating a load difference between the vertical roll load on the working side and the vertical roll load on the driving side that are detected; and
an identification step of identifying the inter-roll cross angle on the basis of the load difference, wherein
the load detection step performs a state of normal rotation and a state of reverse rotation of the work rolls, and detects the vertical roll loads on the working side and the driving side in each rotation state of the work rolls,
the load difference calculation step calculates the load difference in each rotation state of the work roll are preformed, and
the identification step identifies the inter-roll cross angle on the basis of a relative change of the load difference in each rotation state of the work roll.

2. A cross angle identification method for identifying an inter-roll cross angle of a rolling mill,
the rolling mill being a rolling mill of four-high or more that includes a plurality of rolls including at least a pair of work rolls and a pair of backup rolls,
the cross angle identification method comprising:
a roll bending force application step of, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on an upper side and between rolls of a lower roll assembly including the work roll on a lower side, in a state where a roll gap between the work rolls is put into an open state;
a load detection step of detecting vertical roll loads that act in a vertical direction on rolling support positions on a working side and a driving side of at least one of the backup roll on the upper side or the backup roll on the lower side;
a load difference calculation step of calculating a load difference between the vertical roll load on the working side and the vertical roll load on the driving side that are detected; and
an identification step of identifying the inter-roll cross angle on the basis of the load difference, wherein
the load detection step sets at least two levels or more of roll bending forces applied in an open state of the roll gap, performs one of normal rotation and reverse rotation of the work rolls or rotation and stop of the work rolls, and detects the vertical roll loads on the working side and the driving side in each rotation state of the work rolls at each level, and
the identification step further identifies an inter-roll frictional coefficient, or a position of a point of a thrust counterforce acting on the backup roll.

3. A cross angle identification method for identifying an inter-roll cross angle of a rolling mill,
the rolling mill being a rolling mill of four-high or more that includes a plurality of rolls including at least a pair of work rolls and a pair of backup rolls,
the cross angle identification method comprising:
a roll bending force application step of, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on an upper side and between rolls of a lower roll assembly including the work roll on a lower side, in a state where a roll gap between the work rolls is put into an open state;
a load detection step of detecting vertical roll loads that act in a vertical direction on rolling support positions on a working side and a driving side of at least one of the backup roll on the upper side or the backup roll on the lower side;
a load difference calculation step of calculating a load difference between the vertical roll load on the working side and the vertical roll load on the driving side that are detected; and
an identification step of identifying the inter-roll cross angle on the basis of the load difference, wherein
the load detection step sets at least three levels or more of roll bending forces applied in an open state of the roll gap, performs one of normal rotation and reverse rotation of the work rolls or rotation and stop of the work rolls, and detects the vertical roll loads on the working side and the driving side in each rotation state of the work rolls at each level, and
the identification step further identifies an inter-roll frictional coefficient, and a position of a point of a thrust counterforce acting on the backup roll.

Assignees

• Nippon Steel Corp

Inventors

• Ishii Atsushi
• Ishitsuka Shota
• Okabe Yuuto
• Nikkuni Daisuke

Classifications

• B21B2265/12

  Rolling load or rolling pressure; roll force · CPC title

• B21B38/10 Primary

  for measuring roll-gap, e.g. pass indicators · CPC title

• B21B2271/02

  Roll gap, screw-down position, draft position · CPC title

• B21B38/08

  for measuring roll-force · CPC title

• B21B2269/04

  Work roll bending · CPC title