# US 10,500,620 B2 · Method for manufacturing parts with a low waviness from an electrogalvanized metal sheet, corresponding part and vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,500,620 B2 - Document ID: US10500620B2 - Status: Granted - Kind: B2 - Application number: 15/115,231 - Filed: 2014-01-30 - Published: 2016-11-24 - Granted: 2019-12-10 - Earliest claimed: 2014-01-30 - Assignees: ArcelorMittal - Applicants: ArcelorMittal - Inventors: Hervé Derule - Web page: https://patentgrep.com/patent/US10500620B2 ## CPC - B21B 27/005: {Rolls with a roughened or textured surface; Methods for making same} - C21D 8/0236: {Cold rolling} - C21D 8/0273: {Final recrystallisation annealing} - C21D 9/46: for sheet metals - C23C 2/06: Zinc or cadmium or alloys based thereon - C23C 2/40: Plates; Strips - C25D 5/36: of iron or steel - C25D 5/48: After-treatment of electroplated surfaces - C25D 13/22: Servicing or operating {apparatus or multistep processes} - B21B 2001/221: {by cold-rolling} - B21B 2001/228: {skin pass rolling or temper rolling} - B21B 2267/10: Roughness of roll surface - B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} - B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04) - 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 (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - 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 (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract A method for manufacturing parts is provided. The method includes cold rolling a substrate with work cylinders whose work surface has a roughness Ra2.5 of less than or equal to 3.6 μm, depositing the metal coating on at least one face of the annealed substrate by electrodeposition to form the metal sheet and deforming the cut metal sheet to form the parts. The outer surface of the metal coating has a waviness Wa0.8 of less than or equal to 0.5 μm after the deformation step. A part and vehicle are also provided. ## Claims ### Claim 1 A method for manufacturing parts made from a metal sheet comprising the steps of: providing a substrate; cold rolling the substrate, at least a last cold rolling pass being done with work cylinders whose work surface have a roughness Ra2.5 of less than or equal to 3.6 μm; recrystallization annealing of the cold rolled substrate; skin-pass rolling the annealed substrate; depositing a zinc-based metal coating on at least one face of the substrate by electrodeposition to form a metal sheet; cutting the metal sheet; and deforming the cut metal sheet to form parts, an outer surface of the metal coating having a waviness Wa0.8 of less than or equal to 0.5 μm after the deformation step. ### Claim 2 (depends on 1) The method according to claim 1, wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces have a roughness Ra2.5 of less than or equal to 3.3 μm. ### Claim 3 (depends on 2) The method according to claim 2, wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces have a roughness Ra2.5 of less than or equal to 3.2 μm. ### Claim 4 (depends on 3) The method according to claim 3, wherein at least the last cold rolling pass is carried out with straightened and non-etched work cylinders whose work surfaces have a roughness Ra2.5 of less than or equal to 0.5 μm. ### Claim 5 (depends on 4) The method according to claim 4, wherein at least the last cold rolling pass is carried out with straightened and non-etched work cylinders whose work surfaces have a roughness Ra2.5 of less than or equal to 0.4 μm. ### Claim 6 (depends on 1) The method according to claim 1, wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces are not etched. ### Claim 7 (depends on 1) The method according to claim 1, wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces are stochastically etched. ### Claim 8 (depends on 1) The method according to claim 1, wherein the step of skin-pass rolling is performed with electro discharge texturing work cylinders whose work surfaces have a roughness Ra2.5 of from 1.65 to 2.95 μm. ### Claim 9 (depends on 8) The method according to claim 8, wherein the step of skin-pass rolling is performed with electro discharge texturing work cylinders whose work surfaces have a roughness Ra2.5 of from 1.65 to 2.30 μm. ### Claim 10 (depends on 1) The method according to claim 1, further comprising a step of: painting the deformed parts. ### Claim 11 (depends on 1) The method according to claim 1, wherein the outer surface of the metal coating has a waviness Wa0.8 of less than or equal to 0.45 μm after the deformation step. ### Claim 12 (depends on 11) The method according to claim 11, wherein the outer surface of the metal coating has a waviness Wa0.8 of less than or equal to 0.40 μm after the deformation step. ### Claim 13 (depends on 12) The method according to claim 12, wherein the outer surface of the metal coating has a waviness Wa0.8 of less than or equal to 0.35 μm after the deformation step.