Methods for producing a three-dimensional vehicle door frame inner reinforcement element, for producing a vehicle door frame and for producing a vehicle reinforcement structure

Patent metadata

Field	Value
Publication number	US-10974780-B2
Application number	US-201415512901-A
Country	US
Kind code	B2
Filing date	Sep 22, 2014
Priority date	Sep 22, 2014
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Methods for producing a three-dimensional vehicle door frame inner reinforcement element, for producing a vehicle door frame and for producing a vehicle reinforcement structure A method for producing a three-dimensional vehicle door frame inner reinforcement element ( 52 ) comprising an inner center pillar part ( 66 ), an inner front pillar part ( 68 ) and an inner side rail part ( 64 ) joining the inner center pillar part ( 66 ) and the inner front pillar part ( 68 ). The method comprises: providing an inner center pillar blank, an inner front pillar blank and an inner side rail blank, said inner blanks being substantially planar, assembling the inner center pillar blank and the inner front pillar blank to the inner side rail blank in order to form a substantially planar door frame inner reinforcement blank, hot stamping the door frame inner reinforcement blank to shape the three-dimensional door frame inner reinforcement element ( 52 ).

First claim

What is claimed is:

1. A method for producing a three-dimensional vehicle door frame inner reinforcement element, the door frame inner reinforcement element including at least an inner center pillar part, an inner front pillar part an inner side rail part and a roof reinforcement part extending in a direction perpendicular to the inner front pillar part and to the inner side rail part, the inner side rail part joining the inner center pillar part and the inner front pillar part, the inner front pillar part, the roof reinforcement part, and the inner center pillar part each extending from the inner side rail part, the method comprising:
providing inner blanks, one of said inner blanks being an inner center pillar blank, another one of said inner blanks being an inner front pillar blank and a third one of said inner blanks being an inner side rail blank, the inner blanks being planar;
assembling the inner center pillar blank and the inner front pillar blank to the inner side rail blank in order to form a planar door frame inner reinforcement blank; and
hot stamping the planar door frame inner reinforcement blank to shape the three-dimensional door frame inner reinforcement element, the roof reinforcement part being obtained by hot stamping a roof reinforcement blank made integral with the inner side rail blank.

2. The method as recited in claim 1 wherein the inner blanks are made of a press hardening steel.

3. The method as recited in claim 2 wherein the press hardening steel has a tensile strength greater than or equal to 1300 MPa after the hot stamping step.

4. The method as recited in claim 2 wherein the press hardening steel has a composition, in percent weight:
0.10%≤C≤0.5%;
0.50%≤Mn≤3%;
0.10%≤Si≤1%;
0.01%≤Cr≤1%;
Ti≤0.2%;
Al≤0.1%;
S≤0.05%;
P≤0.1%;
0.005%≤B≤0.010%; and
a remainder comprising iron and impurities resulting from production.

5. The method as recited in claim 1 wherein the inner center pillar blank and the inner front pillar blank are assembled to the inner side rail blank by laser welding such that the inner center pillar blank and the inner front pillar blank are each joined to the inner side rail blank by a continuous weld line.

6. A method for producing a vehicle door frame including at least a front pillar, a center pillar and a side rail, formed by the assembly of a three-dimensional vehicle door frame outer reinforcement element and of a three-dimensional vehicle door frame inner reinforcement element, the method comprising the following steps:
producing a three-dimensional vehicle door frame outer reinforcement element;
producing a three-dimensional vehicle door frame inner reinforcement element by the method as recited in claim 1 ; and
assembling the door frame outer reinforcement element and the door frame inner reinforcement element to form the vehicle door frame.

7. The method as recited in claim 6 wherein the door frame outer reinforcement element comprises at least an outer center pillar part, an outer upper front pillar part and an outer side rail part joining the outer center pillar part and the outer upper front pillar part, the step of producing the three-dimensional vehicle door frame outer reinforcement element comprising the following steps:
providing outer blanks comprising an outer center pillar blank, an outer upper front pillar blank and an outer side rail blank, the outer blanks being planar;
assembling the outer center pillar blank and the outer upper front pillar blank to the outer side rail blank in order to form a planar door frame outer reinforcement blank; and
hot stamping the door frame outer reinforcement blank to shape the three-dimensional vehicle door frame outer reinforcement element.

8. The method as recited in claim 7 wherein the outer blanks are made of a press hardening steel.

9. The method as recited in claim 7 wherein the door frame outer reinforcement element further comprises an outer lower front pillar part joined to the outer upper front pillar part, and an outer lowerside sill part joining the outer lower front pillar part to the outer center pillar part, the step of producing the three-dimensional vehicle door frame outer reinforcement element further comprising the following steps:
providing an outer lower front pillar blank and an outer lowerside sill blank, the outer lower front pillar and outer lowerside sill blanks being planar; and
assembling the outer lower front pillar blank to the outer upper front pillar blank, and assembling the outer lowerside sill blank to the outer lower front pillar blank and to the outer center pillar blank in order to form the planar door frame outer reinforcement blank.

10. The method as recited in claim 9 wherein the outer lowerside sill blank is made of a press hardening steel different than the press hardening steel of the other outer blanks.

11. The method as recited in claim 6 wherein the three-dimensional vehicle door frame outer reinforcement element and the three-dimensional vehicle door frame inner reinforcement element are shaped as complementary opened profiles such that a part of the front pillar, the center pillar and the side rail of the vehicle door frame each have a hollow closed section.

12. The method as recited in claim 6 , wherein the inner front pillar part extends frontward and downward from the inner side rail part to a free lower end comprised in a horizontal plane higher than a horizontal plane comprising a lower end of the front pillar.

13. A method for producing a vehicle reinforcement structure including at least a vehicle door frame and an underbody reinforcement element, the underbody reinforcement element comprising at least a front transversal beam and a rear transversal beam parallel to the front transversal beam, the method comprising the following steps:
producing the vehicle door frame by the method as recited in claim 6 ;
producing the underbody reinforcement element; and
assembling the vehicle door frame to the underbody reinforcement element such that the front pillar of the vehicle door frame is attached to the front transversal beam of the underbody reinforcement element and the center pillar of the vehicle door frame is attached to the rear transversal beam of the underbody reinforcement element.

14. The method as recited in claim 13 wherein the underbody reinforcement element further comprises an intermediate transversal beam extending between and parallel to the front and rear transversal beams, the intermediate transversal beam being attached to a lowerside sill joining the front pillar to the center pillar of the door frame.

15. The method as recited in claim 14 wherein the transversal beams of the underbody reinforcement element are welded to an inner lowerside sill part of the lowerside sill extending between the front transversal beam and the rear transversal beam.

16. The method as recited in claim 15 , wherein the door frame outer reinforcement element comprises at least an outer center pillar part, an outer upper front pillar part and an outer side rail part joining the outer center pillar part and the outer upper front pillar part, the step of producing the three-dimensional vehicle door frame outer reinforcement element comprising the following steps:
providing outer blanks comprising an outer center pillar blank, an outer upper front pillar blank and an outer side rail blank, the outer blanks being planar;
assembling the outer center pillar blank and the outer upper front pillar blank to the outer side rail blank in order to form a planar door frame outer reinforcement blank; and
hot stamping the door fram

Assignees

• Arcelormittal

Inventors

• Schneider Nicolas
• Drouadaine Yves

Classifications

• B60Y2410/12

  Production or manufacturing of vehicle parts · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title

• B23K2101/006

  Vehicles · CPC title

• B23K26/21

  by welding · CPC title

• B21D47/01

  beams or pillars · CPC title