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US 2023/0415822 A1Published application
Rear underfloor structure for a motor vehicle
AssigneeArcelorMittal
InventorsDan HASENPOUTH, Olivier MORIAU
Life of this patent
Estimating the term…
Abstract
Rear underfloor structure (2) for a motor vehicle (1) including a first and a second side member (4) and at least one cross member (5) linking the first and second side members (4), wherein the rear underfloor structure (2) is made by stamping a single tailor welded blank (26) comprising at least two sub-blanks.
Claims17
1-16. (canceled)
17:
- A rear underfloor structure for a motor vehicle, the rear underfloor structure comprising:
- a first and a second side member and at least one cross member linking the first and second side members, wherein the rear underfloor structure is made by stamping a single tailor welded blank including at least two sub-blanks.
18:
- The rear underfloor structure as recited in claim 17 wherein the stamping is a hot stamping.
19:
- The rear underfloor structure as recited in claim 17 wherein the at least one cross member includes at least two cross members.
20:
- The rear underfloor structure as recited in claim 17 wherein each of the first and second side members includes:
- a horizontal wall and an inner wall linked by an inner radius,
- at least one cross-member attachment zone, corresponding to a portion of the first or second side member on to which the corresponding cross-member is attached,
- wherein the inner radius extends along at least part of the cross-member attachment zone.
1 more element
21:
- The rear underfloor structure as recited in claim 17 wherein at least one of the at least two sub-blanks is coated with an aluminum based metallic coating.
22:
- The rear underfloor structure as recited in claim 17 wherein at least one of the at least two sub-blanks is coated with an aluminum based metallic coating, comprising from 2.0 to 24.0% by weight of zinc, from 1.1 to 12.0% by weight of silicon, optionally from 0 to 8.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being inferior to 0.3% by weight, a balance being aluminum and optionally unavoidable impurities.
23:
- The rear underfloor structure as recited in claim 17 wherein at least one of the at least two sub-blanks includes an emissivity increasing top layer on at least one side.
24:
- The rear underfloor structure as recited in claim 17 wherein at least one of the at least two sub-blanks is made of a press-hardening steel having an ultimate tensile strength after hot stamping above 1800 MPa.
25:
- The rear underfloor structure as recited in claim 17 wherein at least one of the at least two sub-blanks is made of a press-hardening steel having a yield strength after hot forming comprised between 700 and 950 MPa, an ultimate tensile strength after hot forming comprised between 950 MPa and 1200 MPa and a bending angle after hot forming above 75°.
26:
- The rear underfloor structure as recited in claim 17 further comprising at least one metallic patch.
27:
- The rear underfloor structure as recited in claim 26 wherein the at least one metallic patch includes an emissivity increasing top layer.
28:
- The rear underfloor structure as recited in claim 17 further comprising at least one weld seam reinforcing patch applied on an area having a weld seam.
29:
- The rear underfloor structure as recited in claim 28 wherein the at least one weld seam reinforcing patch includes an emissivity increasing top layer.
30:
- The rear underfloor structure as recited in claim 17 wherein a thickness of an interdiffusion layer in an Aluminum based metallic coated area of the rear underfloor structure is between 3 microns and 15 microns.
31:
- The rear underfloor structure as recited in claim 30 wherein the thickness is between 3 microns and 10 microns.
32:
- A motor vehicle comprising the rear underfloor structure as recited in claim 17.