Patent ID: 6796363
Filing Date: 2004-09-28
Classification: B22D,B22F,B82Y,H01F,Y10T

Abstract:
A cooling roll for manufacturing a ribbon-shaped magnetic material by colliding a molten alloy to a circumferential surface of the cooling roll so as to cool and then solidify the alloy, the cooling roll comprising:dimple correcting means defined by a plurality of ridges provided on the circumferential surface of the cooling roll for dividing dimples that are produced on a roll contact surface of the cooling roll, wherein the plurality of ridges are provided by forming a plurality of grooves at an angle less than or equal to 30Â° relative to an edge of said cooling roll with an average width of 0.5-90 &mgr;m in the circumferential surface of the cooling roll, the width of the grooves preventing the molten alloy from entering the groove, and each ridge including a plurality of discontinuous, discreet, and spaced apart regions; and wherein the ratio of the area of the grooves with respect to the area of the circumferential surface when they are projected on the same plane is in the range of 30-99.5%.