US4322600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming microcavities on the surface of a rolling mill roll
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1979-12-31
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Granted: 1982-03-30
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Expires: 1999-12-31
Abstract
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.
Inventors
- 👤 Jean Crahay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/067; B23K26/0673; B21; B21B; B21B27/00; B21B27/005; B23K26/08; B23K26/0823; C; C21; C21D; C21D9/00; C21D9/38
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
185 words
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.
Claim 2
Dependent Claim
185 words
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.
Claim 3
Dependent Claim
66 words
Apparatus as claimed in claim 1, in which each marking head comprises a support portion having a deflector for directing an incoming laser beam from the deflecting means towards the focusing lens and a head portion which contains the focusing lens, the head portion being movable relative to the support portion along only one axis and carrying a roller for contacting the surface of the roll.
Claim 4
Dependent Claim
37 words
Apparatus as claimed in claim 1, further comprising means for rotating each roll about its longitudinal axis and for causing relative translation of each roll and its marking head parallel to the longitudinal axis of the roll.
Claim 5
Dependent Claim
21 words
Apparatus as claimed in claim 3, further comprising means for synchronising the said relative translation and the rotation of each roll.
Claim 6
Dependent Claim
22 words
Apparatus as claimed in claim 3, further comprising means for synchronising the rotation of the disc and the rotation of each roll.
Claim 7
Dependent Claim
20 words
Apparatus as claimed in claim 4 or 5, in which the synchronising means comprise a single motor and non-sliding transmissions.
Claim 8
Dependent Claim
25 words
Apparatus as claimed in claim 1, in which each marking head includes a duct for blowing a gas onto said surface of its corresponding roll.
Claim 9
Independent Claim
185 words
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.
Claim 10
Independent Claim
185 words
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.
Claim 11
Dependent Claim
20 words
A method as claimed in claim 8, in which the laser beam has a wavelength in the far infrared range.
Claim 12
Dependent Claim
20 words
A method as claimed in claim 8, in which the laser beam has a power of 500 to 3000 W.
Claim 13
Dependent Claim
36 words
A method as claimed in claim 8, in which said surface of each roll is constituted by a coating preliminarily deposited on the roll, and the laser beam has a power of 10 to 50 W.
Claim 14
Dependent Claim
29 words
A method as claimed in claim 8, including varying the dimensions of the microcavities as a function of the position of the microcavity on the surface of the roll.
Claim 15
Dependent Claim
32 words
A method as claimed in claim 12, in which the dimensions of the microcavities is varied by modifying the power of the laser beam, a power increase causing an increase in dimensions.
Claim 16
Dependent Claim
31 words
A method as claimed in claim 13, in which the dimensions are varied in accordance with a predetermined dispersion varying the power of the laser beam about a predetermined average value.
Claim 17
Dependent Claim
47 words
A method as claimed in claim 8, in which the surface of the first roll is of steel, the method including blowing oxygen, or another gas which facilitates microcavity formation, onto said surface of the first roll at the point where the first intermittent beam is focused.
Claim 18
Dependent Claim
53 words
A method as claimed in claim 8, in which the surface of the first roll is constituted by a coating preliminarily deposited on the first roll, the method including blowing a protective gas such as argon onto said surface of the first roll at the point where the first intermittent beam is focused.
Claim 19
Dependent Claim
60 words
A method as claimed in claim 8, in which a relative pause is ensured at each instant between the point of the first roll surface at which a microcavity is formed and the point of impact of the first intermittent beam on the first roll by synchronising the movement of the first roll surface and the rotation of the disc.
Claim 20
Dependent Claim
44 words
A method as claimed in claim 8, in which the series of microcavities is caused to follow a regular helical path about the longitudinal axis of each roll by translational movement of the focused beam along each roll and rotational movement of each roll.
Claim 21
Dependent Claim
21 words
A method as claimed in claim 18, in which the microcavities form a regular hexagonal lattice on the first roll surface.
Claim 22
Dependent Claim
60 words
A method as claimed in claim 19, in which regular hexagonal lattice is obtained by synchronising the rotational of the disc and the rotation of the first roll in such a way that one revolution of the cylinder corresponds exactly to the passage of n+1/2 reflecting or transmitting regions, the helical pitch related to the distance between two successive microcavities.
Claim 23
Dependent Claim
82 words
Apparatus according to claim 3 further comprising means for synchronising the rotation of each roll with the rotation of said disc such that the location of the area at which said laser beam is focused on each roll moves in synchronism with the rotation of the disc, and such that the movement of said area on each roll is in the same direction as the movement of said rotating disc as viewed via said focusing lens from said area on the roll.
Claim 24
Dependent Claim
13 words
Apparatus according to claim 21 wherein said laser is a carbon dioxide laser.
References Cited (Backward Citations)
US3404254A
Cited
US3749878A
Cited
US3636251A
Cited
US3679863A
Cited
US4131782A
Cited
US4083629A
Cited
US4186619A
Cited
US4170726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |