Roll for molten metal plating bath and method for manufacturing the same
AssigneesHitachi Metals, Ltd., Nisshin Steel Co., Ltd.
InventorsShinichi Koga, Taizo Matsuda, Eisuke Ogawa, Makoto Sasaki
Life of this patent
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Abstract
A roll for a hot-dip metal coating bath has a substantially cylindrical shape. At least an outer peripheral surface of the roll is formed of a ceramic material. A relatively coarse groove is formed on the outer peripheral surface of the roll in a direction crossing the rotation axis. A plurality of relatively fine grooves is formed in the bottom surface of the coarse groove along the longitudinal direction of the coarse groove. In place of the fine grooves extending in the longitudinal direction of the coarse groove, a plurality of rows of fine grooves may be formed along the crosswise direction of the coarse groove.
Claims8
A roll for advancing a steel sheet in a hot-dip metal coating bath comprising a cylindrical body having an outer peripheral surface made of ceramic material, with a coarse groove having a spiral shape or an annular shape crossing a direction along a rotation axis of the roll and formed on the outer peripheral surface, for advancing a steel sheet while rotating in a hot-dip metal coating bath with the outer peripheral surface of said roll in contact with both the hot-dip metal coating bath and with the steel sheet,
- a plurality of rows of fine grooves are formed in parallel along a longitudinal direction of the coarse groove on a bottom surface of the coarse groove, wherein
- each of the fine grooves has an aperture width of 50 to 500 μm and said coarse groove has a width greater than the combined width of said plurality of rows of fine grooves.
Dependencies are inferred from the claim text.