Laser-assisted bending method

• US 6,415,639 B1
• Filed: 02/07/2000
• Issued: 07/09/2002
• Est. Priority Date: 07/02/1997
• Status: Expired due to Fees

• Current Assignee: TRUMPF Maschinen Austria GmbH & Co.KG. (Trumpf GmbH + Company KG)
• Original Assignee: TRUMPF Maschinen Austria GmbH & Co.KG. (Trumpf GmbH + Company KG)
• Inventors: Kilian, Friedrich, Schröder, Kurt, Schuöcker, Dieter
• Primary Examiner(s): Larson, Lowell A.
• Application Number:
  US09/446,682
• Time in Patent Office: 883 Days
• Field of Search: 723/421, 372/55, 219/121.6
• US Class Current: 72/342.1
• CPC Class Codes: B21D 5/00 Bending sheet metal along straight lines, e.g. to form simple curves B21D11/06 - B21D11/18 take precedence; corrugating sheet metal B21D13/00; as edge treatment B21D19/00
• CPC Class Codes: B21D 5/02 on press brakes without making use of clamping means
• CPC Class Codes: B23K 26/0738 into a linear shape

Abstract

The subject matter of the invention is a process for bending a component, e.g. a metal sheet (1) by means of a mechanical force with selective heating by means of a laser beam (6). From one laser beam (6) or several laser beams (6) a radiation field (7, 21) is shaped to form a linear heating zone (9) and at all points along a bend line (8) acts upon the component.

Claims

1. A process for forming a permanent bend in a bendable component, comprising:

irradiating a surface of the component with a linear radiation field of laser radiation, the linear radiation field extending along a bend line about which the component is to be bent, such that all points along the bend line are simultaneously irradiated by the laser radiation so as to locally heat the component along the bend line; and

applying mechanical force to the component to bend the component along the bend line, wherein the linear radiation field is formed by directing a laser beam into at least one end of an interior passage of a tubular conductor having an axial slot formed in a wall thereof, the conductor emitting a linear radiation field from the slot onto the component, wherein the conductor is positioned in a recess in a bending die on which the component is supported, and the conductor is positioned in contact with the component during irradiation and bending of the component.

2. The process of claim 1, wherein the component is bent into a V shape at the bend line so as to form a vertex extending into the recess in the bending die, and wherein the conductor is maintained in contact with the component as the vertex is formed and extends into the recess.

3. A process for forming a permanent bend in a bendable component, comprising:

irradiating a surface of the component with a linear radiation field of laser radiation, the linear radiation field extending along a bend line about which the component is to be bent, such that all points along the bend line are simultaneously irradiated by the laser radiation so as to locally heat the component along the bend line;

irradiating an opposite surface of the component a long the bend line with a second linear radiation field of laser light; and

applying mechanical force to the component to bend the component along the bend line, wherein the second linear radiation field is directed onto the component through a slot formed in a bending punch that contacts and presses the component to bend the component.

4. The process of claim 3, wherein the bending punch includes an internal cavity in which a tubular conductor is disposed, a laser beam being directed into at least one end of an interior passage of the tubular conductor, the conductor having an axial slot in a wall thereof from which a linear radiation field is emitted, the linear radiation field then passing through the slot in the punch onto the component.