Method and apparatus for forming microcavities on the surface of a rolling mill roll
AssigneeCentre de Recherches Metallurgiques-Centrum voor Research in de Metallurgie
InventorJean Crahay
Life of this patent
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Abstract
A continuous beam from a laser is divided into two intermittent beams by a reflecting disc with peripheral holes, rotating about an axis skew to the continuous beam. At least one of the intermittent beams is transmitted to a marking head having a lens which focuses the beam onto the surface of a roll. The roll is rotated and the marking head is moved along the roll, in synchronism with the rotation of the disc, so that a regular hexagonal lattice of microcavities is cut by the focused intermittent beam. The second intermittent beam may be used to cut microcavities in the roll or in a second roll or for other purposes.
Claims22
Apparatus for forming microcavities on respective surfaces of first and second rolling mill rolls, comprising:
- a continuous laser;
- a rotary disc for dividing the laser beam into two intermittent beams, the periphery of the disc having a series of reflecting regions separated from one another by a series of transmitting regions;
- means for rotating the disc about an axis which is inclined with respect to the direction of the continuous laser beam, with the disc periphery intercepting the laser beam;
- a first marking head containing a first focusing lens for focusing a laser beam at an area on said surface of the first roll, which surface is to be moved relative to the marking head so that said area moves along the roll surface;
- a second marking head containing a second focusing lens for focusing a laser beam at an area on said surface of the second roll;
- and deflecting means for transmitting at least one of the intermittent beams from the disc to the first focusing lens and for transmitting the other of the intermittent beams from the disc to the second focusing lens.
A method of forming microcavities on respective surfaces of first and second rolling mill rolls, comprising the steps of:
- providing a continuous laser beam;
- dividing the laser beam into two intermittent beams by respectively intercepting the laser beam at the periphery of a disc having a peripheral series of reflecting regions separated from one another by a series of transmitting regions and rotating the disc about an axis which is inclined with respect to the direction of the continuous laser beam such that the beam is successively transmitted through the transmitting regions and reflected by the reflecting regions;
- focusing a first one of the intermittent beams on said surface of the first roll;
- moving said surface of the first roll relative to the first intermittent beam, whereby the focused first beam forms a series of microcavities in said surface of the first roll;
- focusing the other intermittent beam on said surface of the second roll;
- and moving said surface of the second roll relative to the second intermittent beam, whereby the focused beam forms a series of microcavities in said surface of the second roll.
Dependencies are inferred from the claim text.