Method and device for band-edge orientated displacement of intermediate cylinders in a 6 cylinder frame

• US 20030164020A1
• Filed: 04/11/2003
• Published: 09/04/2003
• Est. Priority Date: 07/29/2000
• Status: Active Grant

• Current Assignee: SMS Siemag AG (Bernhard-Weiss-Stiftung)
• Original Assignee: SMS Demag AG
• Inventors: Haberkamm, Klaus Dieter, Ritter, Andreas, Holz, Rudiger
• Granted Patent: US 7,181,949 B2
• Time in Patent Office: Days
• US Class Current: 72/241.2
• CPC Class Codes: B21B 13/142 by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
• CPC Class Codes: B21B 2013/028 Sixto, six-high stands
• CPC Class Codes: B21B 2269/16 Intermediate rolls
• CPC Class Codes: B21B 27/02 Shape or construction of rolls for rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects B21H8/02 ; B21B27/005 takes precedence
• CPC Class Codes: B21B 37/40 using axial shifting of the rolls B21B37/42 takes precedence

Abstract

A method for the strip-edge-oriented shifting of the intermediate rolls (11, 11′) in a six-roll rolling mill comprising respectively a pair of workrolls (10, 10′), intermediate rolls (11, 11′) and backup rolls (12, 12′), whereby at least the intermediate rolls (11, 11′) and workrolls (10, 10′) have devices for axial shifting cooperating with them and each intermediate roll (11, 11′) has a barrel elongated by the amount of the CVC-shifting stroke and a one sided setback (x) in the region of the strip edge. The method is characterized in that the upper intermediate roll (11) is shifted in the direction of the drive side (AS) and the lower intermediate roll (11′) is shifted in the direction of the service side (BS)—or conversely—relative to the neutral shift position (S_zw=0 mm) symmetrically to the rolling mill center (y-y) be respectively the same amount in the direction of their (x-x).

Claims

1. A method of strip-edge-oriented shifting of the intermediate rolls (11, 11′

) in a six-roll rolling mill, comprising respectively a pair of workrolls (10, 10′

), a pair of intermediate rolls (11, 11′

) and a pair of backup rolls (12, 12′

) whereby at least the intermediate rolls (11, 11′

) and the workrolls (10, 10′

) cooperate with devices for their axial shifting and each intermediate roll (11, 11′

) has a barrel elongated by the amount of the CVC-shifting stroke wtih a one-sided setback (x) in the region of the strip edge (14),

characterized in

that the upper intermediate roll (11) is shifted in the direction of the drive side (AS) and the lower intermediate roll (11′

) is shifted in the direction of the service side (BS)—

or conversely—

relative to the neutral shifting position (S_zw=0 mm) symmetrically with respect to the rolling mill center (y-y) by respectively the same amount in the direction of their axes (x-x).

2. A method according to claim 1 characterized in that the shifting of each intermediate roll (11, 11′

) the beginning of the setback (x) is positioned outside, or at, or within the strip edge (14), that is within the strip width.

3. A method according to claim 1 or claim 2 characterized in that the shifting position in different strip width regions is predetermined by piecemeal linear step functions which define different positions of the beginning of the setback (x) relative to the strip edge (14).

4. A rolling mill for strip-edge-oriented shifting of the intermediate rolls, have elongated roll barrels on both sides, especially for carrying out the method according to the invention, characterized in that the intermediate rolls (11, 11′

) each have an elongated barrel extended by the amount of the CVC stroke which is disposed symmetrically with respect to the neutral shifting position (S_zw=0 mm) at the rolling mill center (y-y).

5. The rolling mill according to claim 4 characterized in that the barrel of the intermediate roll (11) at the service side (BS) is provided with a setback (x) whose length (l) is divided into two multiadjacent regions (a and b) which are given in the following equations:

6. The rolling mill according to claim 4 or 5, characterized in that the transition of the setback (x) between the regions a or b, for example, for a predetermined length of 100 mm for a, with a sequential recession in the dimension d is effected in accordance with the following table:

Over a;

x10d/51220d/25630d/12840d/6450d/3260d/1670d/880d/490d/2100 

d

7. The rolling mill according to one or more of claims 4 to 6 characterized in that the one-sided setback (x) is preferably at the service side (BS) for the upper intermediate roll and on the drive side (AS) for the lower intermediate roll.