Patent ID: 9289773
Filing Date: 2016-03-22
CPC Classification: B02C

Claim Text:
1. A vertical mill roller comprising: an outer circumferential surface that surrounds a rotational axis of the roller, the outer circumferential surface connecting a first edge of the roller and a second edge of the roller, the first and second edges being spaced apart in the axial direction, a first grinding surface that continuously occupies a first width portion of the outer circumferential surface in the axial direction; and a second grinding surface that continuously occupies a second width portion of the outer circumferential surface in the axial direction, the second width portion being separate from the first width portion, wherein the outer circumferential surface curves outward from the first edge and curves outward from the second edge such that a maximum diameter (D) of the roller is formed at a maximum-diameter portion of the outer circumferential surface that protrudes outward between the first edge and the second edge, wherein the first grinding surface is smooth, and wherein the second grinding surface includes at least one of a slit groove and a screw groove, the slit groove being defined as at least one of the screw groove being defined as a groove inclined at an angle of 45 degrees or smaller relative to the circumferential direction of the roller.