US 12,325,092 B2
Method and device for determining an actual state of supporting bars of a workpiece support, and machine tool having a device of this type
Manuel Kiefer, Sinsheim (DE); Jens Ottnad, Karlsruhe (DE); Willi Poenitz, Leonberg (DE); Frederick Struckmeier, Heimsheim (DE); and Marc Teschner, Stuttgart (DE)
Assigned to TRUMPF WERKZEUGMASCHINEN SE + CO. KG, Ditzingen (DE)
Filed by TRUMPF Werkzeugmaschinen SE + Co. KG, Ditzingen (DE)
Filed on Sep. 14, 2022, as Appl. No. 17/944,203.
Application 17/944,203 is a continuation of application No. PCT/EP2021/056805, filed on Mar. 17, 2021.
Claims priority of application No. 10 2020 107 256.2 (DE), filed on Mar. 17, 2020.
Prior Publication US 2023/0001522 A1, Jan. 5, 2023
Int. Cl. B23K 37/04 (2006.01); B23K 26/38 (2014.01); G01B 11/25 (2006.01)
CPC B23K 37/0408 (2013.01) [B23K 26/38 (2013.01); G01B 11/2518 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for determining an actual state of a supporting bar for supporting a plate-like workpiece on a machine tool for a cutting machining of workpieces by a cutting beam, with, in an intended state of the supporting bar:
the supporting bar being provided with multiple supporting projections, which are adjacent to one another in a longitudinal direction of the supporting bar, with a projection interspace being formed between mutually adjacent supporting projections,
the supporting projections protruding from a basic body of the supporting bar to a supporting side of the supporting bar in the direction of a height of the supporting bar transversely with respect to the longitudinal direction of the supporting bar, with the supporting side of the supporting bar being designed for supporting the workpiece, and
in a view of a longitudinal side, running in the longitudinal direction of the supporting bar, of the supporting bar, the supporting projections having a defined intended geometry with a projection height, with which the supporting projections extend over a defined height region, assigned to the supporting projections, of the supporting bar, the method comprising:
determining an actual geometry of the supporting projections on the supporting bar by a light section method, the light section method comprising:
projecting a line of light extending in the longitudinal direction of the supporting bar from a light source onto the longitudinal side of the supporting bar;
using the line of light to scan the longitudinal side of the supporting bar over at least part of the height region, assigned to the supporting projections, of the supporting bar in the direction of the height of the supporting bar,
detecting the scanned extent of the longitudinal side of the supporting bar that was scanned using the line of light by an optical detector to generate an image of the longitudinal side of the supporting bar, and
determining the actual geometry of the supporting projections based on the generated image of the longitudinal side of the supporting bar by an evaluation device; and
comparing the determined actual geometry of the supporting projections with the defined intended geometry of the supporting projections by a comparison device.