Laser tool having a hollow shaft drive and non-rotating lens; method for setting the focal position of the laser beams in a laser tool

Patent metadata

Field	Value
Publication number	US-2019329352-A1
Application number	US-201916504018-A
Country	US
Kind code	A1
Filing date	Jul 5, 2019
Priority date	Jan 5, 2017
Publication date	Oct 31, 2019
Grant date	—

Abstract

A laser tool, in particular for the structuring of cylinder running surfaces, that offers the possibility of guiding the laser beam of the laser tool with high process reliability, it is provided that the laser tool has a laser source for producing laser beams that are passed through a lens tube located in a hollow shaft, wherein a lens through which the laser beams are passed is attached to the lens tube, wherein the hollow shaft is designed to be rotatable as a hollow-shaft motor, wherein a spindle, to which is attached an optical device for deflecting the laser beam onto a workpiece surface, is attached to the hollow shaft, wherein the hollow shaft is rotatable independently of the lens.

First claim

What is claimed is:

1 . A laser tool for the structuring of cylinder running surfaces, the laser tool comprising:
a laser source to producing a laser beam that is passed through a lens tube located in a hollow shaft, the hollow shaft being designed to be rotatable as a hollow-shaft motor; a lens through which the laser beams is passed is attached to the lens tube; and a spindle, to which is attached an optical device to deflect the laser beam onto a workpiece surface and is attached to the hollow shaft, wherein the hollow shaft is rotatable independently of the lens.

2 . The laser tool according to claim 1 , wherein the laser tool has a collimator that is located after the laser source in the beam path and is movable substantially parallel to the laser beam via a drive.

3 . The laser tool according to claim 1 , wherein the drive is an electric drive, a servomotor, a hydraulic drive, or a pneumatic drive.

4 . The laser tool according to claim 1 , wherein the collimator is connected to the lens tube.

5 . The laser tool according to claim 1 , wherein the drive has an external position sensor.

6 . The laser tool according to claim 1 , wherein the drive has a control device for controlling the movement of the collimator based on at least one predefinable parameter.

7 . The laser tool according to claim 6 , wherein the at least one parameter is the feed of the collimator toward the optical device or the feed of the collimator toward the laser source.

8 . The laser tool according to claim 1 , wherein the laser tool has at least a lower stop and/or an upper stop that delimit the movement of the collimator.

9 . The laser tool according to claim 1 , wherein the optical device is a reflecting prism or a mirror.

10 . The laser tool according to claim 1 , wherein the laser tool has a control unit that controls the motion of the collimator as a function of a signal from a sensor.

11 . A method for setting the focal position of laser beams in a laser tool comprising a laser source for producing the laser beams and a collimator for producing a parallel course of the laser beam from the laser source, which are passed through a lens, the method comprising:
arranging the lens inside a rotatable spindle; deflecting, via an optical device, the laser beam onto a material surface that is attached to an end of the spindle facing away from the laser source; moving the collimator substantially parallel to the laser beam via a drive; predefining at least one parameter via a controller that controls a motion of the collimator, wherein the collimator is moved in a direction of the optical device or opposite to the direction of the optical device as a function of the at least one parameter.

12 . The method according to claim 11 , wherein the at least one parameter is a feed of the collimator toward the optical device or a feed of the collimator toward the laser source.

13 . The method according to claim 11 , wherein the lens is arranged in a fixed position in a lens tube that is attached to the collimator.

Assignees

• Volkswagen Ag

Inventors

• Wehrendt Christian

Classifications

• B23K26/0648

  comprising lenses · CPC title

• B23K26/0823

  Devices involving rotation of the workpiece · CPC title

• B23K26/352

  for surface treatment · CPC title

• B23K26/355

  Texturing · CPC title

• B23K26/0006

  taking account of the properties of the material involved (B23K26/32, B23K26/40 take precedence) · CPC title