Changing the effective contour of a running surface of a working roll during hot rolling of rolling stock in a roll stand to form a rolled strip

A method for reducing an effective contour of a running surface of a working roller during hot rolling of rolling stock in a roll stand to form a rolled strip, wherein the roll stand comprises:

• an upper working roller and a lower working roller, wherein each working roller has two ends for the rotational mounting of the working roller in chocks;
• wherein in the axial direction, each working roller in the roll stand extending in respective opposite directions has a conical portion followed by a running surface;
• wherein running surfaces of each of the working rollers in the roll stand have a non-cylindrical initial contour prior to the hot rolling;
• wherein in the roll stand, the upper working roller is fitted in the opposite direction to the lower working roller;
• wherein each working roller has a respective displacing device operable for axially displacing the working rollers in the roll stand in respective opposite directions;
• comprising the method steps of:
• hot rolling of the rolling stock between the two working rollers, wherein the radial extent of the running surface of a working roller decreases at a rate of {dot over (Δ)} r during the rolling;
• and
• axially displacing the working rollers in opposite axial directions at a displacement rate of
• v
• ≡
• s
• .
• >
• Δ
• ⁢
• ⁢
• r
• .
• tan
• ⁢
• ⁢
• (
• α
• )
• ,
• where {dot over (Δ)} r indicates the rate of wear of the running surface in the radial direction (R) and α indicates the pitch angle of the conical portion of the respective working roller.

A method for increasing an effective contour of a running surface of a working roller during hot rolling of rolling stock in a roll stand to form a rolled strip, wherein the roll stand comprises:

• an upper working roller and a lower working roller, wherein each working roller has two ends for the rotational mounting of the working roller in chocks;
• wherein in an axial direction, each working roller in the roll stand in respective opposite directions has a conical portion followed by a running surface;
• wherein running surfaces of each of the working rollers in the roll stand have a non-cylindrical initial contour prior to the hot rolling;
• wherein in the roll stand, the upper working roller is fitted in the opposite direction to the lower working roller;
• wherein each working roller has a respective displacing device operable for axially displacing the working rollers in the roll stand in respective opposite directions;
• comprising the method steps of:
• hot rolling of the rolling stock between the two working rollers, wherein the radial extent of the running surface of a working roller decreases by Δr during the rolling;
• and
• axially displacing the working rollers in opposite axial directions by a displacement distance
• 0
• <
• s
• <
• Δ
• ⁢
• ⁢
• r
• tan
• ⁢
• ⁢
• (
• α
• )
• ,
• where Δr indicates the wear of the running surface in the radial direction (R), and α indicates the pitch angle of the conical portion of the respective working roller.

A method for increasing an effective contour of a running surface of a working roller during hot rolling of rolling stock in a roll stand to form a rolled strip, wherein the roll stand comprises:

• an upper working roller and a lower working roller, wherein each working roller has two ends for rotational mounting of the working roller in chocks;
• wherein in the axial direction, each working roller in the roll stand has a conical portion followed by a running surface;
• wherein running surfaces of each of the working rollers in the roll stand has a non-cylindrical initial contour prior to the hot rolling;
• wherein in the roll stand, the upper working roller is fitted in the opposite axial direction to the lower working roller;
• wherein each working roller has a respective displacing device operable for axially displacing the working roller;
• comprising the method steps of:
• hot rolling of the rolling stock between the two working rollers, wherein the radial extent of the running surface of a working roller decreases at a rate of wear during the rolling;
• and
• axially displacing the working rollers in opposite axial directions at a displacement rate of
• 0
• <
• v
• ≡
• s
• .
• <
• Δ
• ⁢
• ⁢
• r
• .
• tan
• ⁢
• ⁢
• (
• α
• )
• ,
• where {dot over (Δ)} r indicates the rate of wear of the running surface in the radial direction (R) and α indicates the pitch angle of the conical portion of the respective working roller.