JPS61242783A - Laser beam machine - Google Patents

Abstract

PURPOSE:To make uniform processing quality by controlling numerically a laser head and compensating the change of the energy density on a work according to the moving speed of the head. CONSTITUTION:A processing control processor 300 for a front stage is provided and a variation pattern is formed in a pattern making and grading part 304in accordance with the data from a production management part 302. The data from the marking part 304 is inputted to a processor 400 of a rear stage. The laser head 20 is scanned in the X- and Y-axis directions by numerical control to a fabric 18 delivered from a fabric roll 12 via driving bodies 24, 26. A laser output control part 402B operates in this stage to compensate the change of the energy density of the laser light so as to meet the speed of the head 20. The specified processing quality is maintained regardless of the processing pattern and the higher uniformity of the quality is attained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser processing device, and particularly in a device that processes a workpiece by controlling a laser head with a numerical control device, The present invention relates to a laser processing apparatus that can uniformly process any part of a processing pattern by compensating for changes in energy density when the moving speed of the laser changes.

[Conventional technology]

FIG. 2 shows an example of a conventional laser processing apparatus. In this figure, on the left side of the cutting conveyor 10, there is disposed a spreading device 114 in which a raw roll/I/12 wound with fabric is set. Furthermore, on the right side of the cutting conveyor 10, a scrap processing device t16 is disposed to accommodate and process the scraps after cutting. The fabric 18 to be processed is passed through a spreading device 1t as indicated by arrows J and F 1 in the figure.
14 onto the cutting conveyor 10, and the scraps are stored in a scrap processing bag @16 as indicated by arrow F2. A laser head 2 is installed near the center of the cutting conveyor 10.
A drive mechanism 22 for scanning 0 is arranged. This drive mechanism 22 includes a first drive body 24 and a second drive body 26. The first driver 24 is 1
A set of drive bodies 26 is provided on both sides of the cutting conveyor 10, and a second drive body 26 is installed movably in the direction of arrow F3. That is, the second driver 26 is driven by the first driver 24 in the direction of arrow F3. The direction of this arrow F3 corresponds to the coordinate axis X assumed on the surface of the fabric 18.

A carriage 28 is attached to the second driver 26, and the carriage 28 is driven by the second driver 26 in the direction of arrow F4 in the figure.

The direction of this arrow F4 corresponds to the coordinate axis Y assumed on the surface of the fabric 18. A laser head 20 is fixed to the carriage 28. That is, the laser head 20 is moved in the direction of the coordinate axis X by the first driver 24 and scanned in the direction of the coordinate axis Y by the second driver 26.

Furthermore, a laser oscillator 30 is installed near the cutting conveyor 1o.
is arranged, and an optical means 62 consisting of a prism or a mirror is arranged on the second driving body 26 mentioned above. Further, the laser oscillator 60 is provided with a light guiding means 64. The laser light emitted from the light guiding means 64 passes through the optical path L1 and enters the optical means 62, where the optical path is changed, and then passes through the optical path L2 to the laser head 20.
reach. The direction of the optical path L1 corresponds to the moving direction of the optical means 62, that is, the moving direction of the second driver 26 as indicated by the arrow F3. Further, the direction of the optical path L2 corresponds to the moving direction of the laser head 20, that is, the moving direction of the carriage 280 arrow F4. Therefore, even if the laser head 20 moves in this way, the laser light output from the laser oscillator 50 can reach the laser head 20 well.

Next, to explain the operation of the above conventional example, the cloth 18
is transported along with the operation of the cutting conveyor 10 and passes through the laser head 20. The laser head 20 is scanned and moved by the drive mechanism 22, and accordingly, the laser beam is scanned while drawing a fixed pattern on the fabric 18.

The scanning movement of the drive mechanism 22 is controlled by a processing control table @220 including a numerical control device.

[Problem that the invention seeks to solve]

In the conventional laser processing apparatus (as described above), due to the performance of the numerical control device, the laser head 20 runs quickly in the straight line part A of the fixed pattern, and in the curved part, especially the curve B with a small radius of curvature or the sharp corner. The speed of the laser head 2o must be slowed down at the bend C.

By the way, the output of the laser beam is adjusted to suit the processing of a straight line part, so if the output is kept constant when the moving speed of the laser head 20 decreases at a curved part etc., There was a problem that the energy density increased and the area could become scorched, melted, or burnt.

This invention was made to solve this problem, and the energy density on the workpiece does not increase even if the moving speed of the laser head decreases. It is an object of the present invention to provide a laser processing device that can compensate for changes in energy density on a workpiece and uniformly process any part of a processing pattern.

[Means for solving problems]

A laser processing apparatus according to the present invention controls a laser head that irradiates a workpiece with a laser beam by numerical control to scan and move a predetermined processing pattern on the workpiece, and also moves the laser head. Control means are provided to compensate for changes in energy density on the workpiece depending on the speed.

[Effect]

In this invention, changes in the energy density on the workpiece are compensated for according to the moving speed of the laser head, so even if the moving speed of the laser head changes, the machining quality does not deteriorate and the Even parts can be processed to be uniformly sharp.

〔Example〕

An embodiment of the present invention will be described below.

The structure of the processing apparatus in this invention is the same as the apparatus shown in FIG. 2 except for the processing control device, so the explanation of the same part C will be omitted.

Next [: Processing control device (2), which is a control means that performs processing while compensating for changes in the energy density of the laser beam on the fabric 18 in accordance with the control of the operation of each part of the device and the moving speed 11 of the laser head 2°. In this example,
Compensation for the change in energy density c) If the moving speed of the laser head 20 becomes faster, the output of the laser light is increased, and if the moving speed of the laser head 2o becomes slower, the output of the laser light is reduced (this is done from 2). That is, the output of the laser beam is changed according to the moving speed 1 of the laser head 2o to compensate for the change in energy density.

Hereinafter, details will be explained using the block diagram shown in FIG. 1C2.

In FIG. 1, the processing control device 220 includes a first-stage processing device 500 that performs production management, pattern making, grading, or marking processing, and a second-stage processing device 400 and 1 that performs other direct processing; It is configured. A digital data input means 221 such as a paper tape is connected to the processing device 300.
Data for numerically controlling the operation of the laser head 20 is input.

The processing device 600 includes a production management section 602, a pattern making/grading section (hereinafter simply referred to as "rPG section") 604, and a marking section 606. Among these, the production management section 602 has a function of instructing processing processing based on data necessary for production management such as the production quantity and type of the entire processing work. PG section 304
Then, pattern making and grading work is performed based on data input from the production management section 302, and data regarding specific patterns is calculated. Pattern making is the creation of specific processing patterns, and grading is the creation of variations of patterns according to each size from a standard pattern. The data in this PG section 304 is stored in the marking section 30.
6 is input. The marking unit 306 performs a process of arranging patterns on the fabric 18 with a high yield based on the input data. The data of this marking section 306 is manually input to the processing bag j1400 at the subsequent stage. In the processing device t400, laser beam scanning is performed based on data input from the marking section 606, and the fabric 18 is
The cutting process is performed.

Next, the subsequent processing device 400 will be explained.

This processing bag fi! 400 is mainly composed of a crossing control section 402, and the cutting control section 402 is composed of a speed control section 402.
A and a laser output control section 402B, and calculates and outputs operation commands for the oscillator operation panel 404, head drive operation panel 406, and servo controller 408 according to the pattern and marking data determined by the processing device 1300 at the previous stage. This operation command is output to the servo controller 408 via the speed control section 402A, and to the oscillator operation panel 404 via the laser output control section.

The speed control unit 402A takes in the data of the movement path according to the pattern and the scanning of the laser head 20 to be marked in the coordinate X direction and the coordinate Y direction, and adjusts the speed of the laser head 20 according to the magnitude of the curvature of the movement path. The command number is output to the servo controller 40, which changes the moving speed of the servo controller.

The laser output control section 402B changes the output of the laser beam according to the change in speed so that the change in the energy density of the laser beam on the fabric is compensated for according to the speed command from the speed control section 402. A command to do so is output to the oscillator operation panel 404. That is, a command is given to the oscillator operation panel 404 to increase the output of the laser beam when the speed becomes faster, and to decrease the output of the laser beam when the speed becomes slower.

The cutting control unit 402 is also connected to the spreading device It14, the scrap processing device 16, and the conveyor driving bag [IT410].

The oscillator operation panel 404 is connected to the laser oscillator 30, and thereby controls the laser oscillation operation of the laser oscillator 60. It can also be operated by manual operation of the oscillator operation panel 404.

The head drive operation panel 406 is connected to the head drive mechanism 22. This head driver 11J[I22 includes a first driver 24 and a second driver 26.

The head drive operation panel 406 is also operated not only by commands from the cutting control section 402 but also by manual operation by the operator.

Servo controller 408 is connected to head drive mechanism 22 . That is, the head drive mechanism 22 is driven based on data input from the head drive operation panel 406 and the servo controller 408, and the scanning of the laser beam is controlled.

The conveyor drive device 410 is for driving the cutting conveyor 10. The conveyor drive device 410, the spreading device 14, and the scrap processing device 16 operate in a certain manner based on commands from the cutting control unit 402, so that the fabric 18 is sent onto the cutting conveyor 10 according to the degree of processing. It has become.

Next, the overall operation of the above embodiment will be explained.

First, based on data input from the processing device 300, the cutting control section 402 controls the spreading device 14 and the conveyor drive device 4.
10 is operated, thereby sending out the fabric 18 from the original fabric roll 12 onto the cutting conveyor 10.

On the other hand, from the cutting control section 402 to the laser output control section 402B
An operation command is outputted to the oscillator operation panel 404 via the oscillator operation panel 404, the laser oscillator 60 starts oscillating operation, and the laser light reaches the laser head 20 via the light guide means 64, the optical path guide means 62, and the optical path. , is irradiated so as to be focused on the fabric 18.

At this time, the head drive operation panel 40 is
6, operation commands are further output to the servo controller 408 via the speed controller 402, and the head drive mechanism 22 is driven. That is, the laser head 20 is moved along the coordinate axes X and Y by the first and second driving bodies 24.26.
The laser beam is scanned in the direction of
Scanned on 8.

At this time, even if the moving speed of the laser head 20 changes, control is performed to compensate for the change in the energy density of the laser beam on the fabric 18, and the fabric 18 is cut.

That is, the laser output control unit 402B operates to increase the output of the laser beam as the speed of the laser head 20 becomes faster, and decrease the output as the speed becomes slower, thereby compensating for the change in energy density. Even parts are cut while maintaining a certain cutting quality.

The fabric 18 cut through the above operations is sent toward the scrap processing device 116 by the cutting conveyor 10. At this time, the scrap processing bag @16 is driven based on the operation command from the cutting control section 402. The cut fabrics 18A, 18B are collected from the cutting conveyor 10 by an operator or a robot, and the scraps are stored in the scrap processing device 16.

Note that the object to be processed may be fabric, leather, etc., as well as metal, plastic, etc. Furthermore, when the object to be processed has a relatively small area, such as fabric, or metal, the spreading device 14 is not used, and the object is directly placed on the cutting conveyor 10.

〔Effect of the invention〕

As explained above, the present invention is capable of drawing a predetermined machining pattern on the workpiece by numerically controlling the laser head that condenses and irradiates the workpiece with laser light output from a laser light source, and Control is performed to compensate for changes in energy density on the workpiece according to the moving speed of the laser head, so it is possible to maintain a constant processing quality regardless of the processing pattern of the workpiece. can.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a processing control device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a conventional laser processing device. In the figure, 10 is a cutting conveyor, 18 is a fabric, 20 is a laser head, 22 is a head drive mechanism, 24 is a first drive body, 26 is a second drive body, 220 is a processing control device, 6
00 is a front-stage processing device, and 400 is a rear-stage processing device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a laser processing device that processes a workpiece supported on a support table by scanning and irradiating the workpiece two-dimensionally with laser light, the device outputs an output from a laser light source. a laser head that condenses and irradiates a workpiece with a laser beam; and a laser head that is controlled by numerical control to draw a predetermined machining pattern on the workpiece and according to the moving speed of the laser head. A laser processing apparatus comprising: a control means for compensating for changes in energy density on a workpiece; (2) The laser processing apparatus according to claim 1, wherein the compensation for the change in energy density in the control means is achieved by changing the output of the laser beam according to the moving speed of the laser head.