Method for Manufacturing Parts with a Low Waviness from an Electrogalvanized Metal Sheet, Corresponding Part and Vehicle

Patent metadata

Field	Value
Publication number	US-2016339491-A1
Application number	US-201415115231-A
Country	US
Kind code	A1
Filing date	Jan 30, 2014
Priority date	Jan 30, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

A method for manufacturing parts is provided. The method includes cold rolling a substrate with work cylinders whose work surface has a roughness Ra 2.5 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 Wa 0.8 of less than or equal to 0.5 μm after the deformation step. A part and vehicle are also provided.

First claim

1 - 18 . (canceled)

19 . A method for manufacturing parts made from a metal sheet comprising the steps of:
providing a substrate; having at least one face coated with; cold rolling the substrate, at least a last cold rolling pass being done with work cylinders whose work surface have a roughness Ra 2.5 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 Wa 0.8 of less than or equal to 0.5 μm after the deformation step.

20 . The method according to claim 19 , wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces have a roughness Ra 2.5 of less than or equal to 3.3 μm.

21 . The method according to claim 20 , wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces have a roughness Ra 2.5 of less than or equal to 3.2 μm.

22 . The method according to claim 21 , wherein at least the last cold rolling pass is carried out with straightened and non-etched work cylinders whose work surfaces have a roughness Ra 2.5 of less than or equal to 0.5 μm.

23 . The method according to claim 22 , wherein at least the last cold rolling pass is carried out with straightened and non-etched work cylinders whose work surfaces have a roughness Ra 2.5 of less than or equal to 0.4 μm.

24 . The method according to claim 19 , wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces are not etched.

25 . The method according to claim 19 , wherein at least the last cold rolling pass is carried out with work cylinders whose work surfaces are stochastically etched.

26 . The method according to claim 19 , wherein the step of skin-pass rolling is performed with EDT work cylinders whose work surfaces have a roughness Ra 2.5 of from 1.65 to 2.95 μm.

27 . The method according to claim 26 , wherein the step of skin-pass rolling is performed with EDT work cylinders whose work surfaces have a roughness Ra 2.5 of from 1.65 to 2.30 μm.

28 . The method according to claim 19 , further comprising a step of:
painting the deformed parts.

29 . The method according to claim 19 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.45 μm after the deformation step.

30 . The method according to claim 29 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.40 μm after the deformation step.

31 . The method according to claim 30 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.35 μm after the deformation step.

32 . A part obtained by deforming a metal sheet comprising:
a substrate including at least one face coated with a zinc-based metal coating deposited by electrodeposition; and an outer surface of the metal coating of the part having a waviness Wa 0.8 of less than or equal to 0.50 μm.

33 . The part according to claim 32 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.45 μm.

34 . The part according to claim 33 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.40 μm.

35 . The part according to claim 34 , wherein the outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.35 μm.

36 . The part according to 32 , further comprising a paint film on the metal coating.

37 . A motorized land-based vehicle comprising:
a body, the body including a part according to claim 32 .

Assignees

• Arcelormittal

Inventors

• Derule Hervé

Classifications

• B21B2001/228

  skin pass rolling or temper rolling · CPC title

• C23C2/40

  Plates; Strips · CPC title

• C23C2/06

  Zinc or cadmium or alloys based thereon · CPC title

• B21B27/005 Primary

  Rolls with a roughened or textured surface; Methods for making same · CPC title

• C25D5/36

  of iron or steel · CPC title