Process for marking the surface of a rolling mill

• US 4,806,731 A
• Filed: 02/23/1988
• Issued: 02/21/1989
• Est. Priority Date: 02/23/1987
• Status: Expired due to Fees

• Current Assignee: Adolphe Bragard, Frederic Terreur, Jacques Defourny, Jacques Halleux
• Original Assignee: Adolphe Bragard, Frederic Terreur, Jacques Defourny, Jacques Halleux
• Inventors: Halleux, Jacques, Defourny, Jacques, Terreur, Frederic, Bragard, Adolphe
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US07/159,138
• Time in Patent Office: 364 Days
• Field of Search: 219/121.68, 219/121.69, 219/121.84, 219/121.76, 219/121.77, 219/121.8, 219/121.82
• US Class Current: 219/121.69
• CPC Class Codes: B21B 2267/10 Roughness of roll surface
• CPC Class Codes: B21B 27/005 Rolls with a roughened or textured surface; Methods for making same
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 26/0823 Devices involving rotation of the workpiece
• CPC Class Codes: B23K 26/12 in a special atmosphere, e.g. in an enclosure
• CPC Class Codes: B23K 26/123 in an atmosphere of particular gases
• CPC Class Codes: B23K 26/142 for the removal of by-products
• CPC Class Codes: B23K 26/1437 for flow rate control
• CPC Class Codes: B23K 26/1438 for directional control
• CPC Class Codes: B23K 26/355 Texturing
• CPC Class Codes: B23K 26/3584 Increasing rugosity, e.g. roughening
• CPC Class Codes: B44B 3/04 wherein non-plane surfaces are worked
• CPC Class Codes: B44B 7/00 Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beamsburning or charring wood stock B27M1/06
• CPC Class Codes: C21D 9/38 for roll bodies
• CPC Class Codes: Y10T 428/12993 Surface feature [e.g., rough, mirror]

Abstract

A rolling mill is rotated while microscopic dents with peripheral ridges are formed by an intermittent laser beam in the presence of a gas jet directed at the beam impact zone. The output and the angle of incidence of the gas jet are controlled and microscopic dents are formed with a ridge on only part of their periphery. Steel sheet cold-rolled by means of such a roll has uniformly distributed hollows, each hollow partially surrounding an elevation.

Claims

1. A process for marking the surface of a rolling mill roll having a longitudinal axis, comprising the steps of rotating the roll about its longitudinal axis and forming a multitude of microscopic dents are formed in the surface of the said roll by means of an intermittent laser beam in the presence of a gas jet directed at an impact zone of the said laser beam, each microscopic dent giving rise to a ridge, and controlling the output and the angle of incidence of the gas jet, whereby microscopic dents are formed with a ridge on only a part of their periphery.

2. A process according to claim 1, wherein a gas jet comprises a non-oxidising gas.

3. A process according to claim 2, wherein the non-oxidising gas is a reducing gas.

4. A process according to claim 1, including aligning the said gas jet in a direction substantially perpendicular to the generatrix of the roll passing over the said impact zone.

5. A process according to claim 4, including injecting the said gas in the direction of rotation of the roll.

6. A process according to claim 1, wherein the ratio L/D between the dimension L of the microscopic dents, measured along the periphery of the roll, and their dimension D, measured parallel to the longitudinal axis of the roll, is between 1 and 5.

7. A process according to claim 6, wherein the ratio L/D is between 1.1 and 2.5.

8. A process according to claim 1, including heating the ridge together with the portion of the roll surface on which the ridge is disposed, to a temperature sufficient to bring about the start of melting and the welding of the ridge to the said portion of the roll surface.

9. A process according to claim 8, wherein said heating is implemented by means of a second laser beam or a deviated part of the intermittent laser beam.

10. A rolling mill roll with a surface having a multitude of microscopic dents formed by means of an intermittent laser beam, according to the process of claim 1, wherein the microscopic dents are provided with a ridge on only a part of their periphery.

11. A rolling mill roll according to claim 10, wherein the ratio L/D between the dimension L of the microscopic dents, measured along the periphery of the roll, and their dimension D, measured parallel to the longitudinal axis of the roll, has a value of between 1 and 5, preferably between 1.1 and 2.5.

12. A steel sheet cold-rolled by means of a roll according to claim 10, wherein the surface of the sheet has a multitude of uniformly distributed hollows, each hollow partially surrounding an elevation.