Manufacturing method for bumper beam of vehicle

Patent metadata

Field	Value
Publication number	US-10166593-B2
Application number	US-201615248860-A
Country	US
Kind code	B2
Filing date	Aug 26, 2016
Priority date	Sep 7, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A manufacturing method for a bumper beam of a vehicle may include pipe making, producing a circular pipe by pipe molding a steel plate having a predetermined thickness between first and second molding rolls, heating the circular pipe to a set temperature in a heating furnace, pressurizing and molding the circular pipe heated in the heating furnace and having flexibility, while inserting the circular pipe between an upper mold and a lower mold to form a molding beam, and thereafter, rapidly cooling the molding beam to form the molding beam into a high-strength molding beam, and curvature-molding the high-strength molding beam at a predetermined curvature through a curvature molding machine.

First claim

What is claimed is:

1. A manufacturing method for a bumper beam of a vehicle, comprising:
producing a circular pipe by pipe molding a steel plate having a predetermined thickness between first and second molding rolls;
heating the circular pipe to a predetermined temperature in a heating furnace;
pressurizing and molding the circular pipe heated in the heating furnace and having flexibility, while inserting the circular pipe between an upper mold and a lower mold to form a molding beam, and thereafter, cooling the molding beam to form the molding beam into a high-strength molding beam; and
curvature-molding the high-strength molding beam at a predetermined curvature through a curvature molding machine.

2. The manufacturing method of claim 1 , wherein the steel plate comprises a cold rolled steel plate having a thickness of 1 mm.

3. The manufacturing method of claim 2 , wherein the cold rolled steel plate has a tensile strength of 550 MPa.

4. The manufacturing method of claim 1 , wherein the heating furnace comprises a high-frequency heating furnace.

5. The manufacturing method of claim 1 , wherein the heating furnace comprises an electric heating furnace.

6. The manufacturing method of claim 1 , wherein the predetermined temperature is 900° C.

7. The manufacturing method of claim 1 , wherein the molding beam comprises a straight beam material in which a lower surface of the molding beam is formed as a flat horizontal surface by the lower mold, and an upper surface of the molding beam is molded into a concave portion to contact the lower surface at a side by the upper mold to form at least two closed cross-sections between the lower surface and the upper surface.

8. The manufacturing method of claim 7 , wherein in the high-strength molding beam, the lower surface of the high-strength molding beam is disposed on an edge of a curvature radius of the high-strength molding beam to be curvature-molded.

9. The manufacturing method of claim 1 , wherein the high-strength molding beam has a tensile strength of 1800 MPa.

10. A manufacturing method for a bumper beam of a vehicle, comprising:
producing a circular pipe by pipe molding a cold rolled steel plate having a thickness of 1 mm between a plurality of molding rolls;
heating the circular pipe at 900° C. or higher in a high-frequency heating furnace;
pressurizing and molding the circular pipe heated in the high-frequency heating furnace and having flexibility, while inputting the circular pipe between an upper mold and a lower mold to produce a molding beam comprising of a straight beam material in which a lower surface is formed as a flat horizontal surface by the lower mold, and an upper surface is molded to a concave portion to contact the lower surface at a side by the upper mold and form at least two closed cross-section between the lower surface and the upper surface, and thereafter, cooling the molding beam to produce a high-strength molding beam; and
curvature-molding the high-strength molding beam at a predetermined curvature through a curvature molding machine.

11. The manufacturing method of claim 10 , wherein the cold rolled steel plate has a tensile strength of 550 MPa.

12. The manufacturing method of claim 10 , wherein in the high-strength molding beam, the lower surface of the high-strength molding beam is disposed on an edge of a curvature radius of the high-strength molding beam to be curvature-molded.

13. The manufacturing method of claim 10 , wherein the high-strength molding beam has a tensile strength of 1800 MPa.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Sungwoo Hitech Co Ltd

Inventors

• Kim Hyun Gyung
• Park Jeong Min
• Lee Mun Yong

Classifications

• B21D22/025

  for tubular articles · CPC title

• B21D53/88 Primary

  other parts for vehicles, e.g. cowlings, mudguards · CPC title

• B21D35/005

  characterized by the material of the blank or the workpiece (B21D26/053 takes precedence) · CPC title

• B21D22/022

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title

• B21D5/12

  making use of forming-rollers · CPC title