Bending and shifting system for rolling mill stands

Patent metadata

Field	Value
Publication number	US-11724294-B2
Application number	US-202017421298-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Jan 17, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

The rolling mill stand comprises a bending device and a shifting device for the rolling rolls. The housing supports the upper backing and work rolls, and the lower backing and work roll and comprises the lower bending block, the upper bending block, the chock of the upper work roll, the chock of the lower work roll, the axial shifting device of the upper work roll, the axial shifting device of the lower work roll. The chock of the lower work roll is coupled with the lower bending block to transmit a bending load on the lower work roll. The upper bending block transmits a bending load on the upper work roll by means of the action of actuators. The bending block comprises a slide with a T-section which slides in the guide and a chock of the upper backing roll, whereby the upper bending block, instead of being a single piece, is formed by two different and separate structural components.

First claim

The invention claimed is:

1. A rolling mill stand comprising two or more upper rolling rolls, one roll forming an upper work roll and two or more lower rolling rolls, one roll forming a lower work roll and comprising two housings, each housing being arranged at a respective axial end of said rolling rolls, wherein, at a first of said two housings, there are provided
two lower bending blocks and two upper bending blocks fixed to said first housing,
a chock for the upper work roll and a chock for the lower work roll, a chock for the upper backing roll and a chock for the lower backing roll,
a first axial shifting device for the upper work roll to produce a first horizontal translational movement of the upper work roll in a direction parallel to the axis thereof,
a second axial shifting device for the lower work roll to produce a second horizontal translational movement of the lower work roll in a direction parallel to the axis thereof,
wherein the chock of the lower work roll is constrained to the lower bending block to allow said chock of the lower work roll to perform vertical movements,
wherein each of the two upper bending blocks is a different structural element separated from the chock of the upper backing roll and comprises a first part, which forms a vertical sliding coupling with a respective guide fixed on said first housing, and a second part, which forms an element for supporting the chock of the upper backing roll and the chock of the upper work roll, so that the chock of the upper backing roll and the chock of the upper work roll are constrained together to the two upper bending blocks
wherein the first shifting device is integrally fixed directly to the two bending blocks of the upper backing roll, by means of structural elements or supporting arms,
wherein each second part of the bending block, which forms a support element, is C-shaped with a respective upper projection which is inserted into a lateral groove of the chock of the upper backing roll, to allow a lifting and a lowering of the chock; and
wherein the chock of the upper backing roll comprises two lateral support surfaces, arranged at a height greater than that of said lateral groove, which are hooked by two hooks of a balancing crosspiece so that, in the event of a replacement operation of the upper work roll, the balancing crosspiece is not dismounted from the position thereof on the rolling mill stand;
thereby allowing the integral lifting and lowering of the chock of the upper work roll, of the two upper bending blocks and of the first shifting device under load, while the rolling operation is in progress.

2. The rolling mill stand according to claim 1 , wherein said vertical sliding coupling is a slide with a T-shaped cross-section, which slides in the respective guide, and is adapted to prevent the bending block from being detached even when the work roll and the respective chock are extracted from the stand.

3. The rolling mill stand according to claim 2 , wherein there are provided hydraulic actuators which are capable of reacting against the lower bending blocks and thus capable of transmitting a bending load on the lower work roll.

4. The rolling mill stand according to claim 3 , wherein the first horizontal translational movement of the upper work roll occurs between the chock of the upper work roll and the upper bending blocks.

5. The rolling mill stand according to claim 4 wherein the second horizontal translational movement of the lower work roll occurs between the chock of the lower work roll and the lower bending block and is performed under load while the rolling operation is in progress.

6. The rolling mill stand according to claim 5 , wherein the lower shifting device is integrally fixed to said first housing or to the respective lower bending block.

Assignees

• Danieli Off Mecc

Inventors

• Dorigo Andrea

Classifications

• B21B31/22 Primary

  mechanically {, e.g. by thrust blocks, inserts for removal} · CPC title

• B21B29/00

  Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls {; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends (control devices responsive to roll bending B21B37/38)} · CPC title

• B21B31/18

  by moving rolls axially · CPC title

• B21B2013/025

  Quarto, four-high stands · CPC title