Roll crown for the specific avoidance of quarter waves

Patent metadata

Field	Value
Publication number	US-10589328-B2
Application number	US-201615744158-A
Country	US
Kind code	B2
Filing date	May 12, 2016
Priority date	Jul 28, 2015
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A roller stand ( 1 ) that has a roller stand frame ( 3 ) in which working rollers ( 4, 5 ), or working rollers ( 4, 5 ) and support rollers ( 8, 9 ), or working rollers ( 4, 5 ), intermediate rollers ( 10, 11 ), and support rollers ( 8, 9 ) are mounted. Each roller ( 4, 5, 8, 9, 10, 11 ) can be rotated about a respective rotational axis ( 6, 7 ). In a roller stand ( 1 ) without intermediate rollers ( 10, 11 ), the working rollers ( 4, 5 ) can be moved relative to one another in the direction of the respective rotational axis ( 6, 7 ), i.e. axially. In a roller stand ( 1 ) with intermediate rollers ( 10, 11 ), the same applies to the working rollers ( 4, 5 ) or the intermediate rollers ( 10, 11 ). Each of the axially movable rollers ( 4, 5 or 10, 11 ) has an effective barrel length (L) and a curved contour (R 1 , R 2 ) which extends over the entire effective barrel length (L). Each of the axially movable rollers ( 4, 5 or 10, 11 ) has a contour (R 1 , R 2 ) made by superimposing a respective base function (B 1 , B 2 ) with a respective additional function (Z 1 , Z 2 ). The base functions (B 1 , B 2 ) and the additional functions (Z 1 , Z 2 ) are functions of the location (x) in the direction of the respective rotational axis ( 6, 7 ). The base functions (B 1 , B 2 ) are determined so as to complement each other in a specified relative axial position in an unloaded state of the axially movable rollers ( 4, 5 or 10, 11 ) and form a convex or concave roller gap profile depending on a movement direction upon being moved from the axial position. The sum of the additional functions (Z 1 , Z 2 ) is a symmetrical function, which is monotonous on both sides, with respect to the barrel center of the axially movable rollers ( 4, 5 or 10, 11 ) in the unmoved state.

First claim

The invention claimed is:

1. A roll stand for producing flat rolled stock comprising:
the roll stand has roll stand uprights;
work rolls, or work rolls and backup rolls or work rolls, intermediate rolls and backup rolls are all mounted in the roll stand uprights;
each of the rolls mounted in the roll stand uprights is rotatable about a respective rotational axis;
where the work rolls or the work rolls and backup rolls are mounted in the roll stand uprights, the work rolls are supported in the uprights to be displaceable axially with respect to one another along the directions of their respective rotational axis, and where the work rolls, the intermediate rolls and the backup rolls are mounted in the roll stand uprights, the work rolls or the intermediate rolls are displaceable axially with respect to one another along the directions of their respective rotational axis;
the work rolls or the intermediate rolls that are axially displaceable with respect to one another each has an effective barrel length (L);
the work rolls or the intermediate rolls that are axially displaceable with respect to one another each has a curved contour, which extends over the entire effective barrel axial length (L);
one of the two work rolls or of the two intermediate rolls that are axially displaceable with respect to one another has a first curved contour with a first radius (R 1 ) at each location along the rotational axis thereof, the first radius (R 1 ) corresponding to a combination of a base radius (R 0 ) of the first curved contour and superposition of a first basis function (B 1 ) and a first additional function (Z 1 );
the other of the two work rolls or of the other two intermediate rolls that are axially displaceable with respect to one another has a second curved contour with a second radius (R 2 ) at each location along the rotational axis thereof, the second radius (R 2 ) corresponding to a combination of a base radius (R 0 ) of the second curved contour and superposition of a second basis function (B 2 ) and a second additional function (Z 2 );
the basis functions (B 1 , B 2 ) satisfy the relationships

B
⁢

⁢
1

=

+
A

·

sin
⁡

(

2
⁢

⁢
φ

L
Ref

⁢

(

x
+
c

)

)

-

B
·
x

⁢

⁢
and

B
⁢

⁢
2

=

-
A

·

sin
⁡

(

2
⁢

⁢
φ

L
Ref

⁢

(

x
-
c

)

)

+

B
·
x

or the relationships
B 1=+ A ′( x+c ) 5 +A ( x+c ) 3 −B·x and

B 2=− A ′( x−c ) 5 −A ( x−c ) 3 +B·x

and the additional functions (Z 1 , Z 2 ) satisfy the relationships
Z 1=−α· Cx 2 −β·DX 4 and

Z 2=−(2−α)· Cx 2 −(2−β)· Dx 4

or the relationships
Z 1=−α· C cos λ x and

Z 2=−(2−α)· C cos λ x

where
B 1 and B 2 are the first and second basis functions,
Z 1 and Z 2 are the first and second additional functions,
A and A′ are contour amplitudes,
φ is a contour angle,
L Ref is a reference length,
x is the location or the axial position, with respect to the center of the barrel,
c is a contour displacement,
B is a contour pitch,
α and β are weighting factors,
C and D are proportional factors and
λ is a factor.

2. The roll stand as claimed in claim 1 , wherein the additional functions Z 1 , Z 2 are symmetrical to one another.

3. The roll stand as claimed in claim 2 , further comprising backup rolls on which the work rolls are directly supported; and
the work rolls and the backup rolls have respective peripheral contours and the backup rolls have contour that differ from the contour of the work rolls by a concave difference.

4. The roll stand as claimed in claim 2 , further comprising backup rolls on which the work rolls are supported;
intermediate rolls which support the work rolls on the backup rolls;
the work rolls, the backup rolls and the intermediate rolls have respective peripheral contours; and
the contours of the intermediate rolls differ from the contours of at least one of the work rolls and the backup rolls by a respective concave difference.

5. The roll stand as claimed in claim 1 , further comprising:
the work rolls are directly supported on the backup rolls; and
the work rolls and the backup rolls have respective peripheral contours and the backup rolls have a contour that differ from the contour of the work rolls by a concave difference.

6. The roll stand as claimed in claim 5 , further comprising:
intermediate rolls which support the work rolls on the backup rolls;
the work rolls, the backup rolls and the intermediate rolls have respective peripheral contours; and
the contours of the intermediate rolls differ from the contours of at least one of the work rolls and the backup rolls by a respective concave difference.

7. The roll stand as clai

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Seilinger Alois

Classifications

• B21B2267/18

  Roll crown; roll profile · CPC title

• B21B2269/12

  Axial shifting the rolls · CPC title

• B21B13/142

  by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC · CPC title

• B21B31/18 Primary

  by moving rolls axially · CPC title

• B21B2267/20

  Ground camber or profile · CPC title