IP Library Granted Patent US 11,021,768
Granted Patent B2
US 11,021,768 · App. 15/825,808 · Granted Jun 1, 2021

Shaped boron tubular structure support

Inventors: Dean Richardson (Tecumseh, MI); Jason Bigelow (New Boston, MI)
Assignee: L&W Engineering
C21D9/08B21D22/025B21D22/208C21D1/673C21D2211/008
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Quick Facts
Patent No.
US 11,021,768
App. No.
15/825,808
Granted
Jun 1, 2021
Kind
B2
Abstract

A method of producing a structure support may include: providing a hollow workpiece composed of a steel material; heating the hollow workpiece to an austenitizing temperature range to provide the steel material with an austenitic microstructure; forming the hollow workpiece into a predefined complex geometry while the hollow workpiece is still in the austenitizing temperature range; and cooling the hollow workpiece with the predefined complex geometry to transform the austenitic microstructure into a martensitic microstructure.

Claims (31)

1. A method of producing a structure support, comprising:

providing a hollow workpiece composed of a steel material;

heating the hollow workpiece to an austenitizing temperature range to provide the steel material with an austenitic microstructure;

forming the hollow workpiece into the structure support having a predefined complex geometry while the hollow workpiece is still in the austenitizing temperature range;

cooling the hollow workpiece to transform the austenitic microstructure into a martensitic microstructure; and

wherein forming the hollow workpiece is performed simultaneously with cooling the hollow workpiece.

2. The method of claim 1 , wherein forming the hollow workpiece includes pressing the hollow workpiece between a first press tool and a second press tool.

3. The method of claim 2 , wherein cooling the hollow workpiece includes quenching the hollow workpiece through contact with the first press tool and the second press tool arranged in a closed position until the austenitic microstructure transforms into the martensitic microstructure.

4. The method of claim 2 , wherein forming the hollow workpiece includes deforming the hollow workpiece into the predefined complex geometry in a single press stroke.

5. The method of claim 1 , further comprising transferring the hollow workpiece to a press within a predefined duration after heating the hollow workpiece to the austenitizing temperature.

6. The method of claim 5 , wherein the predefined duration is 30 seconds or less.

7. The method of claim 5 , wherein the predefined duration is 15 seconds or less.

8. The method of claim 1 , wherein the predefined complex geometry includes at least one of a non-round cross section, a transitional shape geometry, and a non-linear geometry along a longitudinal axis of the workpiece.

9. The method of claim 1 , wherein heating the hollow workpiece includes maintaining the austenitizing temperature for a duration of 300 seconds to 600 seconds.

10. The method of claim 1 , wherein cooling the hollow workpiece includes purging the hollow workpiece with a quenching fluid.

11. The method of claim 10 , wherein the quenching fluid is air, nitrogen or oil.

12. The method of claim 1 , wherein the steel material has at least one of the following properties after cooling the hollow workpiece:

a tensile strength of about 1,200 MPa to 1,600 MPa;

a yield strength of about 1,000 MPa to 1,300 MPa;

an elongation of about 5% to 15%; and

a hardness of about 45 HRC to 64 HRC.

13. A method of producing a vehicle structure support, comprising:

providing a hollow metallic workpiece composed of a boron steel material, the hollow metallic workpiece having an initial geometry;

heating the hollow metallic workpiece to a material transformation temperature range for a predetermined duration to austenitize the boron steel material;

transferring the hollow metallic workpiece to a press within a specified time period;

forming the hollow metallic workpiece into the vehicle structure support having a predefined complex geometry different from the initial geometry by deforming the hollow metallic workpiece in the press while the hollow metallic workpiece is still in the material transformation temperature range;

cooling the hollow metallic workpiece at a cooling rate sufficient to transform the austenitized boron steel material into martensite; and

wherein forming the hollow metallic workpiece is performed simultaneously with cooling the hollow metallic workpiece where the hollow metallic workpiece is deformed and quenched in the press via a press tool contacting and pressing the hollow metallic workpiece.

14. The method of claim 13 , wherein the specified time period is 30 seconds or less.

15. The method of claim 13 , wherein the predefined complex geometry includes at least one of a non-round geometry in cross section, a transitional shape geometry, and a non-linear longitudinal extent.

16. The method of claim 13 , wherein the press tool includes an ambient temperature form hardening die.

Assignments (7)
RELEASE OF SECURITY INTEREST IN PATENT COLLATERAL Recorded Apr 8, 2021
From: GOLDMAN SACHS BANK USA, AS COLLATERAL AGENT
To: L & W, INC.
Reel/Frame 055927/0160 →
NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Recorded Apr 8, 2021
From: L & W, INC.
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 055927/0179 →
SECURITY INTEREST Recorded Oct 1, 2019
From: TOWER AUTOMOTIVE OPERATIONS USA I, LLC
To: GOLDMAN SACHS BANK USA, AS COLLATERAL AGENT
Reel/Frame 050584/0566 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 4, 2018
From: L&W ENGINEERING
To: L&W INC.
Reel/Frame 047063/0268 →
SECURITY INTEREST Recorded Aug 2, 2018
From: L & W, INC.
To: BANK OF AMERICA, N.A.
Reel/Frame 046538/0364 →
SECURITY INTEREST Recorded Aug 2, 2018
From: L & W, INC.
To: GOLDMAN SACHS BANK USA
Reel/Frame 046538/0371 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 12, 2018
From: RICHARDSON, DEAN; BIGELOW, JASON
To: L & W ENGINEERING
Reel/Frame 045175/0925 →
Continuity (2)
Provisional Application 62428110 · Nov 30, 2016
Related Publication 20180148807A1 · May 31, 2018