Rolling mill and tandem rolling mill having the same
AssigneeMitsubishi-Hitachi Metals Machinery, Inc.
InventorTakashi Norikura
Life of this patent
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Abstract
A rolling mill, which can use work rolls of a smaller diameter for rolling a hard material and a thin strip material, and can obtain strips of high product quality with high productivity, is provided. For this purpose, a six-high rolling mill includes upper and lower work rolls (2) as a pair for rolling a strip (1), upper and lower intermediate rolls (3) as a pair for supporting the paired upper and lower work rolls, and upper and lower back-up rolls (4) as a pair for supporting the paired upper and lower intermediate rolls, but has no supporting rolls inside and outside the rollable strip width of the work rolls. The work rolls have a small diameter, and use a material having a high longitudinal modulus, such as a hard metal or a ceramic.
Claims4
A six-high rolling mill including upper and lower work rolls as a pair for rolling a metal strip, upper and lower intermediate rolls as a pair for supporting the work rolls, and upper and lower back-up rolls as a pair for supporting the paired upper and lower intermediate rolls, the six-high rolling mill having no supporting rolls inside and outside a rollable strip width of the work rolls,
- wherein the work roll uses a material having a high modulus of longitudinal elasticity,
- and
- a minimum roll diameter of the work roll is intermediate between a minimum diameter upper limit Dmax1 and a minimum diameter lower limit Dmin1, and these parameters are expressed by the following equations:
- minimum diameter upper limit Dmax1=D4max×B/K(1/4)
- where D4max;
- minimum diameter upper limit of conventional work roll with strip width of 1,300 mm:
- 380 mm
- B;
- strip width (mm)/1,300 mm
- K;
- ratio for modulus of longitudinal elasticity of high longitudinal modulus material to conventional material
- (modulus of longitudinal elasticity of high longitudinal modulus material/modulus of longitudinal elasticity of conventional material (21,000 kg/mm2))
- minimum diameter lower limit Dmin1=D4min×B/K(1/4)
- where D4 min;
- minimum diameter lower limit of conventional work roll with strip width of 1,300 mm:
- 180 mm
Dependencies are inferred from the claim text.