JPH01210184A - Laser beam machine - Google Patents

Abstract

PURPOSE:To control the output of a laser beam and to simplify a program by reflecting a part of the laser beam on material to be machine slightly ahead in the proceeding direction and detecting this by an element fitted to a different place. CONSTITUTION:The laser beam 10 oscillated from a laser beam oscillator 6 is reflected and condensed in the direction of the material 3 to be machined by a reflection mirror 1 to perform machining. A mirror part 2 for detection reflects a part of the laser beam 10 and a laser beam 11 for detection is projected on the position 8 slightly ahead in the direction of the machining direction from the machining position 9 of the surface of the material 3 to be machined through an aperture 13. The beam 11 for detection is reflected from the position 8 which is detected by a photodetector 5 via a light receiving device 4. Bits of information such as material and surface conditions of the material 3 to be machined are fed back to the laser beam oscillator 6 via a feedback controller 7 and its output is controlled. By this method, the output of laser beam oscillator 6 is controlled and the program is simplified and machining is performed according to the state of the material 3 to be machined.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser processing machine that processes a workpiece using a laser beam, and in particular, when cutting a plate-shaped workpiece, delicate The present invention relates to a laser processing machine that can control laser beam output according to changes in surface conditions and materials.

[Prior Art] Conventionally, the only way to control the cutting of this type of laser processing machine was to control the output in advance in a program.

[Problems to be Solved by the Invention] For example, a workpiece 31 that has the same surface condition as shown in FIG. 2 but is made of two or more different materials A and B is cut with a laser beam. In this case, with the above-mentioned conventional technology, the only method available is to calculate in advance the changing positions of A and H of the material and control it in a program. Therefore, when it comes to processing products with complex shapes,
The disadvantage is that the program becomes more complex because the number of times it passes through locations where materials A and B change is increased.

Further, as shown in FIG. 3, in the case of a workpiece 32 whose surface conditions C and D slightly change even though it is made of the same material,
Since the cutting process is performed with the same output, there is a drawback that the condition of the cut surface is not uniform.

[Means for Solving the Problems] A laser processing machine of the present invention is a laser processing machine that processes a workpiece by irradiating a laser beam to the workpiece, and reflects at least a part of the laser beam to perform the processing. A detection mirror unit that irradiates the workpiece in front of the position, and a means for detecting a part of the laser beam that is reflected by the mirror unit and reflected after irradiating the workpiece. It is characterized by the presence of

[Function] Therefore, according to the present invention, a part of the laser beam is reflected by the workpiece several millimeters ahead in the traveling direction, and this is detected by an element attached to another location, so that the output of the laser beam is controlled. As a result, the program can be simplified and the machined surface can be made uniform.

[Example] The present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing an embodiment of the present invention, in which a laser beam IO parallel to the surface of the workpiece 3 is emitted above the surface of the workpiece 3 to be machined.
-(: A laser oscillator 6 such as a dTe element is provided, and the laser beam 10 is transmitted to the workpiece 3 by a large reflecting mirror 1.
directed towards.

12 is a lens that focuses the laser beam IO; 14 is a case surrounding the lens 12; and 13 is a window opened in the peripheral wall of the case 14.

A detection mirror section 2 is protruded from approximately the center of the reflecting surface of the large reflecting mirror 1, and the mirror section 2 reflects a portion of the laser beam 10 and directs the detection beam 11 through the window 13.
irradiates the workpiece 3 with The detection beam 11 reflected by the workpiece 3 is collected by the light receiving device 4 and detected by the photodetector 5, and the detection signal is sent to the feedback control device 7, which controls the laser oscillator. Control 6.

To explain the operation of the above embodiment, the laser beam IO emitted from the laser oscillator 6 is reflected toward the workpiece 3 by the reflecting mirror 1 constituting the beam deflector, and is focused on the surface of the workpiece 3. It is illuminated and processed.

The detection mirror unit 2 reflects a part of the laser beam 10, passes through the window 13, and directs the detection beam 11 from the processing position 9 on the surface of the workpiece 3 to a position 8 slightly forward in the processing direction. irradiate.

The branched detection beam 11 is reflected from position 8,
It is detected by the light detector 5 via the light receiving device 4, and information corresponding to the material and surface condition of the workpiece 3 is obtained, and the information is fed back to the laser oscillator 6 via the feedback control device 7. Accordingly, the output of the laser oscillator 6 is controlled to perform processing according to the state of the workpiece 3.

The distance between the reflection position 8 and the processing position 9 on the surface of the workpiece 3 varies depending on the type of processing such as welding or cutting, but is suitably several mm.

To summarize the above-mentioned embodiment in other words, this embodiment reflects a part of the laser beam output from the laser oscillator onto the workpiece using a detection beam mirror to improve the surface condition in the traveling direction. , detect changes in material, etc., and feed that information back to the feedback control system.
This is an output control method for a laser processing machine characterized by controlling the output of the laser oscillator.

[Effects of the Invention] As explained above, the present invention uses an improved reflecting mirror to direct a portion of the laser beam to the workpiece immediately before processing the workpiece, to reflect the delicate surface condition and material of the workpiece. Since changes can be detected, the output of the laser beam can be controlled, the program can be simplified, and a uniform machined surface can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are perspective views for explaining the same. DESCRIPTION OF SYMBOLS 1... Reflection mirror, 2... Mirror part for detection, 3... Workpiece, 4... Light receiving device, 5... Photodetector, 6... Laser oscillator, 7...・Feedback control device.

Claims (1)

[Claims] 1) In a laser processing machine that processes a workpiece by irradiating it with a laser beam, at least a portion of the laser beam is reflected to target the workpiece in front of the processing position. A laser processing machine comprising: a detection mirror section for irradiation; and means for detecting a part of the laser beam that is reflected by the mirror section and reflected after irradiating the workpiece. . 2) The laser processing machine according to claim 1, further comprising a feedback control device that controls a laser oscillator that generates the laser beam based on a detection signal obtained from the detection means.