LU81852A1 - PROCESS FOR THE TREATMENT OF ROLLING ROLLERS BY LASER - Google Patents

PROCESS FOR THE TREATMENT OF ROLLING ROLLERS BY LASER Download PDF

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Publication number
LU81852A1
LU81852A1 LU81852A LU81852A LU81852A1 LU 81852 A1 LU81852 A1 LU 81852A1 LU 81852 A LU81852 A LU 81852A LU 81852 A LU81852 A LU 81852A LU 81852 A1 LU81852 A1 LU 81852A1
Authority
LU
Luxembourg
Prior art keywords
gas
hardening
metal
hardening elements
laser beam
Prior art date
Application number
LU81852A
Other languages
French (fr)
Inventor
J Hancart
J Crahay
Original Assignee
Centre Rech Metallurgique
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centre Rech Metallurgique filed Critical Centre Rech Metallurgique
Priority to LU81852A priority Critical patent/LU81852A1/en
Publication of LU81852A1 publication Critical patent/LU81852A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • B23K26/125—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases of mixed gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0823—Devices involving rotation of the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1462—Nozzles; Features related to nozzles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Articles (AREA)
  • Laser Beam Processing (AREA)

Description

-v I t n>L-na C 1980/7910.-v I t n> L-na C 1980/7910.

y i Λ CENTRE DE RECHERCHES METALLURGIQUES -: ï Π CENTRUM V00R RESEARCH IN DE METALLURGIE, ' fc » | Association sans but lucratif - vereniging zonder wmstoogmerk à BRUXELLES, (Belgique) .y i Λ METALLURGICAL RESEARCH CENTER -: ï Π CENTRUM V00R RESEARCH IN DE METALLURGIE, 'fc' | Non-profit association - vereniging zonder wmstoogmerk in BRUXELLES, (Belgium).

I --- 1 Procédé pour traiter des cylindres de laminoirs par laser.I --- 1 Process for treating rolling mill rolls by laser.

-—-—--- I La présente invention est relative à un procédé pour ï traiter des cylindres de laminoirs par laser, de façon à les marquer I d'empreintes déterminées.The present invention relates to a method for treating rolls of rolling mills by laser, so as to mark them with specific impressions.

# Ces empreintes constituent un moyen de procurer aux tôles minces en acier par contact avec les cylindres traités, une morphologie propice à améliorer leurs propriétés et en particulier i leur aptitude à l'emboutissage.# These fingerprints constitute a means of providing thin steel sheets by contact with the treated cylinders, a morphology conducive to improving their properties and in particular their aptitude for stamping.

Le demandeur a déjà préconisé le procédé suivant : ! à la surface du cylindre en mouvement, on focalise ces impulsions J, i - laser et on injecte de l'oxygène à l'endroit de la focalisation.The applicant has already recommended the following process:! on the surface of the moving cylinder, these pulses J, i - laser are focused and oxygen is injected at the point of focusing.

2.- pour chaque impulsion laser, grâce à l'énergie lumineuse concentrée et à l'énergie libérée par l'oxydation du métal, le cylindre entre localement en fusion et du métal est évaporé, avec formation d'un plasma dont l'expansion se produit au-dessus du point de fusion.2.- for each laser pulse, thanks to the concentrated light energy and the energy released by the oxidation of the metal, the cylinder locally melts and the metal is evaporated, with the formation of a plasma whose expansion occurs above the melting point.

La goutte de métal fondu se déforme sous l'action combinée de la pression du jet d'oxygène, de la pression de la radiation et de la -- pression due à l'expansion du plasma. A la fin de l'impulsion laser, le refroidissement est très rapide et la goutte de métal fondu est figée dans la forme qu'elle avait. La microstructure de la zone fon-t due et de la zone influencée thermiquement qui l'entoure dépend évidemment des conditions précises du traitement.The drop of molten metal deforms under the combined action of the pressure of the oxygen jet, the pressure of the radiation and the pressure due to the expansion of the plasma. At the end of the laser pulse, the cooling is very fast and the drop of molten metal is frozen in the shape it had. The microstructure of the due zone and the thermally influenced zone which surrounds it obviously depends on the precise conditions of the treatment.

On sait qu'il y a intérêt à favoriser le durcissement superficiel des cylindres en vue d'augmenter leur résistance à l'usure. C'est précisément l'objet de la présente invention, d' utiliser l’effet de trempe dû au traitement laser mentionné ci-dessus, pour obtenir une augmentation du durcissement superficiel des cylindres, ce résultat étant obtenu par voie thermochimique.It is known that there is an advantage in promoting the surface hardening of the cylinders in order to increase their resistance to wear. It is precisely the object of the present invention to use the quenching effect due to the laser treatment mentioned above, in order to obtain an increase in the surface hardening of the cylinders, this result being obtained thermochemically.

Le procédé, objet de la présente invention, dans lequel on envoie un faisceau laser sur des cylindres de laminoirs pour marquer leur surface d'empreintes déterminées est essentiellement caractérisé en ce que l'on introduit dans le métal à très haute température soumis à l'action du faisceau laser, des éléments durcissants, tels que par exemple du carbone, de l'azote, dans le but de renforcer l'effet de trempe dû au faisceau laser, î ; Suivant une première modalité de l'invention, les éléments durcissants sont introduits dans le métal au moyen d'un gaz soufflé dans la zone d'impact du faisceau laser.The process which is the subject of the present invention, in which a laser beam is sent onto rolling mill rolls to mark their surface with predetermined impressions, is essentially characterized in that it is introduced into the metal at very high temperature subjected to the action of the laser beam, hardening elements, such as for example carbon, nitrogen, in order to enhance the quenching effect due to the laser beam, î; According to a first embodiment of the invention, the hardening elements are introduced into the metal by means of a gas blown into the impact zone of the laser beam.

Suivant une deuxième modalité de l'invention, le gaz destiné à transporter les éléments durcissants est un gaz se décomposant à haute température.According to a second embodiment of the invention, the gas intended to transport the hardening elements is a gas decomposing at high temperature.

Suivant une autre modalité de l'invention, le gaz destiné à transporter les éléments durcissants est constitué d'un fj> mélange de gaz oxydant tel que de l'oxygène et de gaz apte au 3.- { ? durcissement thermochimique superficiel tel que ammoniac (NH^), azote (N^) -According to another embodiment of the invention, the gas intended to transport the hardening elements consists of a fj> mixture of oxidizing gas such as oxygen and of gas suitable for 3.- {? surface thermochemical hardening such as ammonia (NH ^), nitrogen (N ^) -

Suiv ant une variante de la présente modalité, le gaz destiné à transporter les éléments durcissants est constitué d'un gaz dissociable à haute température, comprenant un radical J oxydant et un radical apte à durcir le métal traité, tel que par exemple du CO^ qui fournirait du carbone et de l'oxygène ou du s N20 qui fournirait de l'oxygène et de l'azote.Following a variant of this modality, the gas intended to transport the hardening elements consists of a gas which can be dissociated at high temperature, comprising an oxidizing radical J and a radical capable of hardening the treated metal, such as for example CO ^ which would supply carbon and oxygen or N20 s which would supply oxygen and nitrogen.

^ Les éléments d'addition tels que C, N apportés par $ * le gaz dans la goutte de métal restent enfermés dans le métal lors du refroidissement rapide. Il se produit ainsi un micro-alliage superficiel qui favorise le durcissement des cylindres et donc leur résistance à l'usure.^ Adding elements such as C, N supplied by $ * the gas in the metal drop remain enclosed in the metal during rapid cooling. A surface micro-alloy is thus produced which promotes the hardening of the cylinders and therefore their resistance to wear.

t i i I " î / y / ijt i i I "î / y / ij

Claims (7)

1. Procédé pour traiter des cylindres de laminoirs, dans lequel on envoie un faisceau laser sur des cylindres de laminoirs pour marquer leur surface d'empreintes déterminées, caractérisé en ce que l’on introduit dans le métal à très haute température v soumis à l'action du faisceau laser, des éléments durcissants tels que par exemple du carbone, de l'azote.1. A method for treating rolling mill rolls, in which a laser beam is sent on rolling mill rolls to mark their surface with determined imprints, characterized in that metal introduced at very high temperature v subjected to the action of the laser beam, hardening elements such as for example carbon, nitrogen. 2. Procédé suivant la revendication 1, caractérisé en ce que les éléments durcissants sont introduits dans le métal au moyen d'un gaz soufflé dans la zone d'impact du faisceau laser.2. Method according to claim 1, characterized in that the hardening elements are introduced into the metal by means of a gas blown into the impact zone of the laser beam. 3. Procédé suivant la revendication 2, caractérisé en ce que le gaz destiné à transporter les éléments durcissants est un gaz se décomposant à haute température.3. Method according to claim 2, characterized in that the gas intended to transport the hardening elements is a gas decomposing at high temperature. 4. Procédé suivant l'une ou l'autre des revendications 2 et 3, caractérisé en ce que le gaz destiné à transporter les éléments durcissants est constitué d'un mélange de gaz oxydant tel que de l'oxygène et de gaz apte au durcissement thermochimique superficiel tel que ammoniac (NH^) , azote (N2) .4. Method according to either of claims 2 and 3, characterized in that the gas intended to transport the hardening elements consists of a mixture of oxidizing gas such as oxygen and gas capable of hardening thermochemical surface such as ammonia (NH ^), nitrogen (N2). 5. Procédé suivant l'une ou l'autre des revendications 2 et 3, caractérisé en ce que le gaz destiné à transporter „ les éléments durcissants est constitué d'un gaz dissociable à haute température, comprenant un radical oxydant et un radical apte à durcir le métal traité.5. Method according to either of Claims 2 and 3, characterized in that the gas intended to transport the hardening elements consists of a gas which can be dissociated at high temperature, comprising an oxidizing radical and a radical capable of harden the treated metal. 6. Procédé suivant la revendication 5, caractérisé en ce que le gaz est du CO2·6. Method according to claim 5, characterized in that the gas is CO2 · 7. Procédé suivant la revendication 5, caractérisé en ce que le gaz est un oxyde d’azote et de préférence du N^O ou 4L. du NO. . / ^Φ/Ψί7. Method according to claim 5, characterized in that the gas is a nitrogen oxide and preferably N ^ O or 4L. NO. . / ^ Φ / Ψί
LU81852A 1979-11-05 1979-11-05 PROCESS FOR THE TREATMENT OF ROLLING ROLLERS BY LASER LU81852A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LU81852A LU81852A1 (en) 1979-11-05 1979-11-05 PROCESS FOR THE TREATMENT OF ROLLING ROLLERS BY LASER

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Application Number Priority Date Filing Date Title
LU81852 1979-11-05
LU81852A LU81852A1 (en) 1979-11-05 1979-11-05 PROCESS FOR THE TREATMENT OF ROLLING ROLLERS BY LASER

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996028574A1 (en) * 1995-03-13 1996-09-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Process and device for increasing the degree of absorption during superficial solid phase hardening of workpieces by laser radiation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996028574A1 (en) * 1995-03-13 1996-09-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Process and device for increasing the degree of absorption during superficial solid phase hardening of workpieces by laser radiation
US5902420A (en) * 1995-03-13 1999-05-11 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Process and device for increasing the degree of absorption during superficial solid phase hardening of workpieces by laser radiation

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