JPS60127085A - Laser working device - Google Patents

Abstract

PURPOSE:To eliminate the working defect in a low speed region and to improve working accuracy by providing a control means for detecting a working speed and compensating a laser output in the region where the working speed is low. CONSTITUTION:The speeds Vx, Vy in the X-axis and Y-axis direction of a working table are detected in an arithmetic circuit 1 for vector and the vector speed is calculated in the stage of laser working. A non-linear amplifier 2 controls a laser oscillator 3 so as to compensate the laser output to be lost by the heat radiation in the stage of working in the region where the working speed is lower than a preset value in accordance with said signal. Inconveniences in working such as a decrease in cutting width in the low speed region and deterioration in surface roughness are eliminated by the control of the laser oscillator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a laser processing apparatus, and particularly to a technique for improving processing accuracy.

<Prior Art> This type of laser processing apparatus irradiates a workpiece with a laser beam emitted from a laser oscillator to perform cutting or other processing on the workpiece.

Since such laser processing equipment performs thermal processing, unless optimal heat input control is performed on the workpiece, the cutting process will change during cutting, resulting in a decrease in processing accuracy.

Conventionally, as shown in the graph shown in Figure 1, the laser output was controlled in proportion to the machining speed, in response to changes in the machining speed caused by the capacity of the machining table.

Conventional laser processing equipment controls the laser output as described above, but in regions where the processing speed is low, for example, 0.5 m10 or less, most of the input laser power is dissipated due to heat transfer. The amount of laser output that contributes to cutting is extremely limited. Therefore, in the low processing speed range, there is a drawback that the cutting area becomes narrow and the surface roughness deteriorates.

<Summary of the Invention> Therefore, in view of the above-mentioned conventional situation, the present invention has been developed to increase the laser output in a region where the processing speed is low in order to obtain a laser output that compensates for the laser power lost due to heat dissipation during processing. The purpose is to improve machining accuracy by controlling the configuration.

<Embodiment of the Invention> Hereinafter, an embodiment of the present invention will be described based on FIGS. 2 to 4.

In FIG. 2, reference numeral 1 denotes a vector calculation circuit as a machining speed detection means for detecting machining speed in the X-axis direction of a machining table (not shown) of the laser machining device.

Detect the velocities VX and Vy in the Y-axis direction, and calculate the vector velocity v=
2 is based on the signal from the vector calculation circuit 1, and calculates the laser output to compensate for the laser output lost due to heat radiation during processing in a region where the processing speed is lower than the preset value. 3 is a nonlinear amplifier as a laser output control device that controls a laser oscillator, and has a characteristic of becoming nonlinear at a preset value as shown in the graph shown in Figure 3. 3 is a laser oscillator, and the nonlinear amplifier The laser output is controlled according to the signal from the amplifier 2.

With the above configuration, the laser output with respect to the machining speed is controlled to have the relationship shown in FIG. 4.

Note that the preset value of the processing speed is, for example, 0.5 mA+
Set as below.

According to this configuration, the laser output is maintained at a predetermined constant value in a region where the processing speed is, for example, 0.5r+J or less to compensate for the laser output lost due to heat dissipation during processing. It is possible to eliminate processing problems such as the narrow cutting area and poor surface roughness in the low speed range, and it is possible to perform highly accurate processing.

In the above embodiment, the laser output was controlled to be constant with respect to the machining speed in a region where the machining speed was smaller than the preset value, but the laser output was controlled to be constant with respect to the machining speed. It may also be controlled to.

Furthermore, controlling the laser output produces the same effect whether it is a continuous wave or a pulse.

<Effects of the Invention> As explained above, according to the present invention, in a region where the processing speed is low, the laser power that is lost due to heat dissipation during processing can be compensated for. - Since the laser oscillator is controlled according to the laser output, it is possible to eliminate the drawbacks caused by the decrease in laser energy in the region where the processing speed is low, and it is possible to improve the processing accuracy.

[Brief explanation of drawings]

Fig. 1 is a graph showing the relationship between processing speed and laser output in a conventional laser processing device, Fig. 2 is a block diagram showing an embodiment of the laser processing device according to the present invention, and Fig. 3 is a nonlinear diagram in the same embodiment. Graph showing characteristics of amplifier, 4th
The figure is a graph showing the relationship between processing speed and laser output in the same example. 1... Vector calculation circuit 2... Nonlinear amplifier 3.
...Laser oscillator agent Masuo Oiwa (and 2 others)

Claims (1)

[Scope of Claims] (1) Processing speed detection means for detecting the processing speed in a laser processing device that processes the workpiece by irradiating the workpiece with a laser beam emitted from a laser oscillator; A laser output control device is provided, which controls the laser oscillator to output a laser that compensates for laser output lost due to heat dissipation during processing in a region where the processing speed is lower than a preset value based on a signal from the processing speed detection means. A laser processing device characterized by: (2) The laser processing apparatus according to claim 1, wherein the laser output control device is configured to control the laser output to a constant value with respect to the processing speed in a region where the processing speed is smaller than the precent value. . (3) The laser processing apparatus according to claim 1, wherein the laser output control device is configured to control the laser output to increase with respect to the processing speed in a region where the processing speed is smaller than the Bricent value by υ. . (4) The laser processing apparatus according to any one of claims 1 to 3, wherein the preset value of the processing speed is set to 0.5 m or less.