Method and apparatus for grinding a rotary body

An apparatus for on-line grinding of a work roll as the work roll is rotated about a rotational axis thereof in a rolling mill, said apparatus comprising:

• a grindstone rotatably supported about an axis of rotation thereof;
• positioning means for positioning said rotatably supported grindstone against the outer circumferential surface of the work roll and such that the axis of rotation of said grindstone extends in a direction that does not intersect the rotational axis of the work roll and such that the axis of rotation of said grindstone intersects a plane extending perpendicular to the rotational axis of the work roll at a predetermined angle;
• and
• means for continuously urging said grindstone toward the outer circumferential surface of the work roll as the work roll is rotated and causing a relative slip between the rotating work roll and said grindstone at a contact point therebetween for causing said grindstone to grind the work roll continuously as said grindstone wears and the work roll is ground.

An apparatus for on-line grinding of a work roll as the work roll is rotated about a rotational axis thereof in a rolling mill, said apparatus comprising:

• a plurality of grindstones each of which is rotatably supported about respective axes of rotation thereof, said plurality of grindstones spaced from one another in a direction extending parallel to the rotational axis of the work roll;
• a plurality of grindstone holders each of which is associated with and operatively connected to a respective one of said grindstones for continuously urging the grindstones toward the outer circumferential surface of the work roll as the work roll is rotated and causing a relative slip between the rotating work roll and said grindstones at a contact point therebetween for causing said grindstones to grind the work roll continuously as the grindstones wear and when the work roll is ground;
• a movable frame on which said plurality of grindstones are mounted such that said axes of rotation of said grindstones extend in a direction that does not intersect the rotational axis of the work roll and such that said axes of rotation of said grindstones each intersect a plane extending perpendicular to the rotational axis of the work roll at a predetermined angle;
• elevating and lowering means connected to said frame for moving said frame in opposite directions which are perpendicular to the direction in which said grind stones are continuously urged against the outer circumferential surface of the work roll by said grindstone holders and said opposite directions also being perpendicular to the direction in which the rotational axis of the work roll extends;
• and
• an elevator driving device operatively connected to said elevating and lowering means for driving said elevating and lowering means to move said frame in said opposite directions.