ROLLING MILL CONTROL

• US 3,766,761 A
• Filed: 10/07/1971
• Issued: 10/23/1973
• Est. Priority Date: 10/07/1971
• Status: Expired due to Term

• Current Assignee: Weiler Engineering Incorporated
• Original Assignee: James Richard Adair, Ronald Wesley Deems
• Inventors: Adair, James Richard, Deems, Ronald Wesley
• Primary Examiner(s): Mehr, Milton S.
• Application Number:
  US05/187,253
• Time in Patent Office: 747 Days
• Field of Search: 72/8,17,20,21
• US Class Current: 72/10.6
• CPC Class Codes: B21B 37/64 Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands

Abstract

This disclosure relates to a control for a rolling mill in which a signal representing the required stretch of the mill for a desired thickness of product and roll gap setting, which stretch is first employed to set the initial roll gap predicated on a predicted rolling pressure, is compared with a signal representing the actual stretch of the mill during rolling. A third signal is produced representing the difference between the first and second signals and which equal the amount which the product differs from the desired gage due to improper initial estimate of predicted rolling pressure employed to set the initial roll gap and, consequently, the required change that must be made to the roll gap to produce a product of the given thickness.

Claims

1. In a control for a rolling mill for rolling to an absolute desired thickness from the earliest developed rolling pressure of said mill, said mill having a roll gap, and said control including means for producing prior to rolling a first signal representing an absolute selected anticipated value of the stretch of the mill for a selected reduction of a given rolled product, the value of said first signal remaining constant throughout the entire rolling operation of said given rolled product, means for setting said roll gap so that the sum of said roll gap setting and said value of said first signal will equal the absolute thickness of the rolled product, means for producing a second signal representing the actual stretch of said mill during rolling, means for comparing said first and second signals and producing a third signal representing the amount of any deviation of the actual mill stretch from the absolute selected anticipated value of the mill stretch, and means for receiving said third signal and for effecting a change in the roll gap to offset the stretch difference to produce a product of said absolute thickness.

2. In a rolling mill according to claim 1, including means for producing a signal representing the initial roll gap, which signal equals the desired thickness less the desired mill stretch.

3. In a rolling mill according to claim 2, including a mechanical means for receiving said initial roll gap signal and for setting said initial roll gap and wherein said means for receiving said third signal includes a piston cylinder assembly.