Rolling stand, rolling train, and method for rolling metal strip
AssigneeSMS Siemag Aktiengesellschaft
InventorsReiner Kopp, Hans-Peter Richter, Heinrich Röse
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Abstract
The invention concerns a rolling stand, a rolling train, and a method for rolling a stepped preprofiled metal strip. In order to guarantee that the metal strip is free of waviness in its longitudinal direction, even after individual thickness reduction of the steps, the invention proposes that the thickness reduction be carried out on a step-specific basis according to the following mathematical relationship: Δhi/hi=Δhi+1/hi+1=ε=constant, where Δhi represents the amount of the thickness reduction in the region of the i-th step, and hi represents the value of the resulting thickness of the metal strip 200 after rolling in the region of the i-th step.
Claims8
A rolling stand (100) for rolling metal strip (200) having a stepped preprofiling, which comprises at least two independently rotating partial rolls (110-i, where i =1, 2, . . . ,) that are arranged side by side axially in a direction transverse to the direction of conveyance of the metal strip and a support device (120), which is arranged opposite the at least two partial rolls and together with the at least two partial rolls fixes an overall roll gap with an overall roll gap cross section;
- wherein the two or more adjacent partial rolls (110-i, where
- i=1,2, . . . ,) are each cylindrically shaped and together with the support device fix respective adjacent partial roll gaps (i, i +1) with different height values hi, hi+1, where
- hi≠hi+1 and i=1, 2, . . . , where the adjacent partial roll gaps together define the overall roll gap cross section, which has a stepped shape;
- and where the height values hi and hi+1 of respective adjacent partial roll gaps (i, i+1) are individually selected in such a way that they satisfy the following mathematical relationship:
- Δhi/hi=Δhi+1/hi+1=ε=constant
- with respect to the metal strip (200) entering the overall roll gap, which metal strip (200) has stepped preprofiling that is geometrically similar to the overall roll gap cross section before rolling but which has greater respective step heights of hi+Δhiand hi+1+Δhi+1, where hi+Δhi ≠hi+1+Δhi+1and Δh1>0 and Δhi+1>0, than the partial roll gaps (i).
A rolling train for rolling metal strip, which comprises a plurality of rolling stands arranged one after the other in the running direction of the metal strip, wherein a first rolling stand is provided with shape rolls or grooved rolls for stepped preprofiling of the metal strip;
- where at least a second rolling stand (100) downstream of the first rolling stand comprises at least two independently rotating partial rolls (110-i, where i=1,2, . . . ,) that are arranged axially side by side in a direction transverse to the direction of conveyance of the metal strip and a support device (120), which is arranged opposite the at least two partial rolls and together with the at least two partial rolls fixes an overall roll gap with an overall roll gap cross section;
- wherein the two or more adjacent partial rolls (110-i, where i=1,2, . . . ,) are each cylindrically shaped and together with the support device fix respective adjacent partial roll gaps (i,i+1) with different height values hi, hi+1, where hi≠hi+1 and i=1,2, . . . , where the adjacent partial roll gaps together define the overall roll gap cross section, which has a stepped shape;
- and where the height values hiand hi+1 of respective adjacent partial roll gaps (i, i+1) are individually selected in such a way that they satisfy the following mathematical relationship:
- Δhi/hi=Δhi+1/hi+1=ε=constant
- with respect to the metal strip (200) entering the overall roll gap, which metal strip (200) has stepped preprofiling that is geometrically similar to the overall roll gap cross section before rolling but which has greater respective step heights of hi+Δhiand hi+1+Δhi+1, where hi+Δhi≠hi+1+Δhi+1and Δhl>0 and Δhi+1>0, than the partial roll gaps (i);
- and where the stepped preprofiling of the metal strip by the first rolling stand is carried out in geometric approximation to the stepped cross section of the overall roll gap of the downstream, second rolling stand but with greater step heights of hi+Δhi and hi+1, where hi+Δhi≠hi+1+Δhi+1, in the region of the i-th and (i+1)-th partial roll gap.
A method for rolling a metal strip, wherein said method comprises the following steps:
- stepped preprofiling of the metal strip in geometric approximation to the stepped cross section of the overall roll gap of a downstream rolling stand (100) but with greater step heights hi+Δhiand hi+1+Δhi+1, where hi+Δhi≠hi+1+Δhi+1and Δh1>0 and Δhi+1>0;
- and
- reduction of the individual step heights of the preprofiled metal strip (200) by Δhi to hi, where i=1, . . . , by rolling the preprofiled metal strip in the downstream rolling stand (100), which comprises at least two independently rotating partial rolls (110-i, where i=1, 2, . . . ,) that are arranged axially side by side in a direction transverse to the direction of conveyance of the metal strip and a support device (120), which is arranged opposite the at least two partial rolls and together with the at least two partial rolls fixes an overall roll gap with an overall roll gap cross section;
- wherein the two or more adjacent partial rolls (110-i, where i=1,2, . . . ,) are each cylindrically shaped and together with the support device fix respective adjacent partial roll gaps (i,i+1) with different height values hi, hi+1, where hi≠hi+1and i=1,2, . . . , where the adjacent partial roll gaps together define the overall roll gap cross section, which has a stepped shape;
- and
- where the height values hiand hi+1of respective adjacent partial roll gaps (i,i+1) are individually selected in such a way that they satisfy the following mathematical relationship:
- Δhi/hi=Δhi+1/hi+1=ε=constant
- with respect to the metal strip (200) entering the overall roll gap, which metal strip (200) has stepped preprofiling that is geometrically similar to the overall roll gap cross section before rolling but which has greater respective step heights of hi+Δhiand hi+1+Δhi+1, where hi+Δhi≠hi+1 and Δh1>0 and Δhi+1>0, than the partial roll gaps (i).
Dependencies are inferred from the claim text.