Width-altering system for strip-shaped rolling rock

Patent metadata

Field	Value
Publication number	US-9764367-B2
Application number	US-201314434351-A
Country	US
Kind code	B2
Filing date	Sep 17, 2013
Priority date	Oct 9, 2012
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A method for altering the width of a strip-shaped rolled material ( 5 ), before, during or after hot rolling the rolled material in a hot rolling mill. The problem is to specify a method for altering width so that the length of a rolled out transition piece lying outside width tolerances can be reduced. Scrap losses are to be reduced. The crown of at least one working roll and/or at least one backing roll of a stand ( 7 ) is set as a function of a width error e=B−B between a setpoint width B setp and the width B of the rolled material ( 5 ), wherein the crown is increased when e>0 and the crown is reduced when e<0. AA R crown BB B setp .

First claim

The invention claimed is:

1. A method for altering the width of a strip-shaped rolled material rolling stock comprising:
passing the rolling stock uncut through a first unit and then through a second unit, wherein rolling of the rolling stock is performed in a rolling stand in at least one of the first unit and the second unit, and further comprising method steps of:
producing the material rolling stock with a first width B 1 , wherein the rolling stock emerges from the first unit with a width B=B 1 , and then transporting the rolling stock downstream to the second unit;
producing a transition piece in the rolling stock, wherein the transition piece is produced upstream of the portion of the rolling stock having the width B 1 , wherein the rolling stock emerges from the first unit including the transition piece and wherein the transition piece is a wedge-shaped piece of changing width and includes a changing width different from that of B 1 ;
producing the rolling stock with a second width B=B 2 , the second width being located upstream of the transition piece, wherein the rolling stock emerges from the first unit with the width B 2 and wherein B 2 is a width greater or lesser than B 1 ; and
setting a crown of at least one working roll and/or at least one backing roll of the rolling stand as a function of a width error e=B setp −B, that is between a setpoint width B setp and the width B of the rolling stock, wherein the crown of the at least one working roll or backing roll is increased if e>0 and wherein the crown of the at least one working roll or backing roll is reduced if e<0.

2. The method as claimed in claim 1 , further comprising the setting of the crown is in a controlled manner as a function of the width error e.

3. The method as claimed in claim 1 , further comprising the setting of the crown in a regulated manner as a function of the width error e, wherein the width B is the measured width B actual of the rolling stock as the rolling stock emerges from the second unit or after the material emerges.

4. The method as claimed in claim 1 , further comprising the setting of the crown takes into consideration the transport time of the rolling stock from the first unit to the rolling stand.

5. The method as claimed in claim 1 , wherein the setpoint width B setp is either a step function H(t) or a ramp function R(t) from B 1 to B 2 or from B 2 to B 1 .

6. The method as claimed in claim 1 , wherein the first unit is a mold of a casting machine.

7. The method as claimed in claim 6 , wherein the casting machine is a bow-type continuous casting machine.

8. The method as claimed in claim 6 , wherein the casting machine is a rolling stand of the roughing mill train.

9. The method as claimed in claim 1 , wherein the first unit is a rolling stand.

10. The method as claimed in claim 9 , wherein the first unit is a rolling stand of a roughing mill train.

11. The method as claimed in claim 1 , further comprising the transporting of the rolling stock from the first unit to the second unit is on a roller table.

12. The method as claimed in claim 1 , further comprising the transporting of the rolling stock emerging from the first unit is in the direction of transport to the second unit while maintaining a tension σ=σnormal; and
setting the tension σ on the rolling stock between the first unit and the second unit as a function of the width error e=B setp −B, and increasing the tension σ to σ>σnormal if e<0.

13. The method as claimed in claim 12 , further comprising reducing the tension σ to σ<σnormal if e>0.

14. The method as claimed in claim 13 , further comprising the setting the tension σ in a controlled manner as a function of the width error e.

15. The method as claimed in claim 13 , further comprising the setting of the tension σ in a regulated manner as a function of the width error e, wherein the width B is a measured width B actual of the rolling stock as it emerges from the second unit.

16. The method as claimed in claim 12 , further comprising the setting of the tension σ on the basis of a mathematical necking model for the rolling stock under tension σ.

Assignees

• Primetals Technologies Germany Gmbh

Inventors

• Burger Rainer
• GRüSS ANSGAR
• Jungbauer Andreas
• Linsbod Robert

Classifications

• B22D11/1206

  for plastic shaping of strands (rolling mills B21B1/46) · CPC title

• B21B1/463

  in a continuous process, i.e. the cast not being cut before rolling · CPC title

• B21B2267/18

  Roll crown; roll profile · CPC title

• B21B1/46

  for rolling metal immediately subsequent to continuous casting (metal-rolling stands B21B13/22; continuous casting B22D11/00, e.g. into moulds with rolls B22D11/06) · CPC title

• B21B37/16 Primary

  Control of thickness, width, diameter or other transverse dimensions (B21B37/58 takes precedence) · CPC title