JPH02179373A - Nc controller for laser beam machine - Google Patents

Abstract

PURPOSE:To prevent the melt down at a corner by sharp angle processing by computing the processing distance in a low output mode and the processing distance in a high output mode at the angle formed by two segments and processing a work respectively at the prescribed distances in the low output mode and the high output mode. CONSTITUTION:The NC program and processing conditions inputted and edited by an interactive input section 1 are stored by a memory section 4. The angle formed by the two segments is determined by using the direction vectors a, b of the two segments and an arithmetic processing section 2 determines the distance at which the processing is executed in the low output mode by this angle. The processing distance in the low output mode is longer as the angle is smaller. The processing distance in the high output mode is determined from the length of the segments when the processing distance in the low output mode is determined. A control section 9 controls a laser oscillator and a servomotor via an input/output section 3 by the calculated processing distances of the two modes and the processing conditions of the two modes stored in the memory section 4. The processing with high accuracy is easily executed in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an NC control device for a laser processing machine used for processing sheet metal or the like.

BACKGROUND ART Conventionally, sheet metal processing using a laser processing machine has been widely practiced.

Problems to be Solved by the Invention However, when attempting to process an acute angle 31 as shown in FIG. The corner part 32 may be cut by cutting the corner part 32 by processing it by lowering the output power, or by making a relief loop 33 on the outside as shown in Fig. 6.
The melt prevented it from falling. Therefore, there are problems in that machining efficiency is poor and additional machining paths are required.

Therefore, this invention solves the above-mentioned problems, and laser-processes the corners at the connecting part of two line segments without having to worry about the laser processing conditions and without requiring an extra processing trajectory. The purpose is to make it possible.

Means for Solving the Problems In order to achieve the above object, the NC control device for a laser processing machine of the present invention analyzes the NC code of an NC program for laser processing a corner formed by two line segments. means for calculating the angle formed by these two line segments;
Input two types of laser processing conditions: low output and high output,
means for editing and storing; means for calculating a machining distance in the low power mode and a machining distance in the high power mode at the corner portion based on the angle formed by the two line segments; The apparatus is equipped with a laser oscillator and means for outputting a command signal to a feeding device in order to process a predetermined distance in each mode.

Effect In such a configuration, once the machining conditions for the low-power mode and the high-power mode are set, the angle between the two line segments forming the corner to be laser-processed is calculated from the NC program, and the machining conditions for both modes are calculated. Distances are respectively calculated corresponding to the angles, and the laser oscillator and feed device are activated to perform machining of each machining distance.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 4.

The NC control device for a laser processing machine shown in FIG. - Analyze the NC program consisting of the code, find the angle formed by the two line segments to be machined, and then use the found angle to find the laser processing conditions for the low power mode and the laser processing conditions for the high power mode. An arithmetic processing unit 2 that controls the servo motor as a feed device and an input/output unit 3 that inputs and outputs command signals to the laser oscillator and the servo motor: Nc10g, high output mode machining conditions and low output mode It also includes a storage section 4 that stores processing conditions and the like.

The arithmetic processing unit 2 includes the NC program analysis unit 6 and the 2111
It has an angle per minute calculation section 7, a processing distance calculation section 8 in low output mode, and a laser oscillator and servo motor control section 9. The input/output section 3 includes a command signal generation section 1o for the laser oscillator and a command signal generation section 11 for the servo motor.

The storage unit 4 also includes an NC program storage unit 12 , a high-output mode machining condition storage unit 13 , and a low-output mode machining condition storage unit 14 .

Next, the operation based on the above configuration will be explained with reference to FIGS. 2 to 4. The NC program and machining conditions input and edited by the human interaction section 1 are stored in the storage section 4. The NC program stored in the storage section 4 is analyzed by the arithmetic processing section 2 during laser processing. Then, using the direction vectors a and b of the two line segments found from the first target point corresponding to the corner and the second target point corresponding to the direction change light from the corner at the current moment, the two line segments are The angle θ formed is θ=arccos(a, b/ I a I l b
l).

Based on this angle θ, the calculation processing unit 2 determines the distance to be processed in the low output mode. The smaller the angle θ,
In order to increase the machining distance in the low output mode, the machining distance is determined according to the multiplier in the graph of FIG. 3. Once the machining distance in low output mode is determined, the machining distance in high output mode can be determined from the length of the line segment. Note that an upper limit value is set so that the length of the machining distance in the low output mode does not become longer than the length of the line segment.

Based on the machining distances of these two machining modes calculated in this way and the machining conditions of both modes stored in the storage section 4, the control section 9 controls the laser oscillator and the servo motor through the input/output section 3. Control.

As shown in Fig. 4 (1a), when machining an acute angle consisting of two line segments 15 and 16 and having a corner 11,
), the machining conditions in the low output mode, such as the laser output frequency, duty, and gas pressure, are changed accordingly.

Effects of the Invention According to the NC control device for a laser processing machine of the present invention, it is possible to prevent melting of corners due to sharp-angle processing by simply setting high-power mode laser processing conditions and low-power mode laser processing conditions. Moreover, high-precision machining can be easily performed without commanding a machining trajectory other than the machining trajectory.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an NC control device for a laser processing machine according to an embodiment of the present invention, Fig. 2 is a diagram showing some details thereof, and Fig. 3 shows the machining distance in low output mode. Figure 4 is a graph showing the processing speed and laser processing conditions during acute angle machining, Figure 5 is a graph showing the melting of corners during conventional acute angle machining, and Figure 6 is a graph showing the multiplier to calculate. The figure shows that during conventional sharp corner machining, escape loops are machined to prevent the melt from falling off at the corners. DESCRIPTION OF SYMBOLS 1... Dialogue human power unit, 2... Arithmetic processing unit, 3... Input/output unit, 4... Storage unit, 9... Control unit, 10.11
...Command signal generation section, 15.16...Line segment, 17.
...Corner. Agent Yoshihiro Morimoto Figure 4 (e) /A Figure 5 Figure 2

Claims (1)

[Claims] 1. A means for calculating the angle formed by these two line segments by analyzing the NC code of the NC program for laser processing a corner formed by two line segments, and two types: low output and high output. means for inputting, editing, and storing laser processing conditions; means for calculating a processing distance in a low output mode and a processing distance in a high output mode at the angle, based on the angle formed by the two line segments; An NC control device for a laser processing machine, comprising means for outputting a command signal to a laser oscillator and a feeding device in order to process a predetermined distance in a low output mode and a high output mode, respectively.