JPH0270394A - Numeral controller for laser processing machine - Google Patents

Abstract

PURPOSE:To realize optimum laser processing by controlling a laser beam output, based on command speed as a reference at the time of accelerating and running a working table, and controlling a laser output, based on the moving speed of the working table as a reference at the time of deceleration. CONSTITUTION:The numeral controller is provided with a position and laser commanding part 1 for outputting a control command from an analyzing part based on a numeral control code by dividing it into position data and laser control data, a speed commanding part 3 for converting a position command based on the position data to speed data, and also, outputting it to a table moving servo-motor 2 and executing a speed control of the sero-motor 2, a laser control part 5 for controlling an output, a frequency and a duty of a laser oscillator 4, based on the laser control data, and a position detector 6 for detecting the position of the table. By such a constitution, at the time of acceleration and steady running of the working table, a laser output is con trolled, based on a command speed as a reference, and at the time of decelera tion, the laser output is controlled, based on the moving speed of the working table as a reference, and optimum laser processing for a beautiful working surface is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a numerical control device for a laser processing machine.

2. Description of the Related Art An example of a laser processing machine using a conventional general-purpose numerical control device is shown in FIG. The general-purpose numerical control device 11 issues an output command to the laser oscillator 12 according to the input program, and also drives the servo motor 13 to move the processing table 14. Laser light 15 generated by laser oscillator 12 is irradiated onto workpiece 18 via reflection mirror 16 and condensing lens 17 to perform processing. In addition,
19 is a position detector for the table 14.

Furthermore, in the above configuration, the laser output from the laser oscillator 12 cannot be adjusted in accordance with the actual movement of the table 14, but is controlled based on, for example, the command speed from the cannibal program.

Problems to be Solved by the Invention However, if the laser output is controlled at the commanded speed, the movement of the table 14 will inevitably be delayed, so there is a drawback that uncut portions will be left when the table 14 is decelerated. Conversely, if the laser output is controlled by the actual moving speed of the table 14, due to thermal lag during acceleration of the table 14,
Gouging will occur.

Therefore, an object of the present invention is to provide a numerical control device for a laser processing machine that can solve the above problems.

Means for Solving the Problems In order to solve the above 111 problems, the numerical control device for a laser processing machine of the present invention includes a laser oscillator, a processing table on which a workpiece is placed and supported, and a processing table that moves the processing table. A numerical control device for a laser processing machine consisting of a servo motor that outputs the numerical control code by dividing it into position data and laser control data, and a position and laser command unit that outputs the numerical control code by dividing it into position data and laser control data, and a speed control unit of the servo motor based on the position data. a speed command unit that controls the speed, a laser control unit that controls the output of the laser oscillator based on the laser control data, and a position detector that detects the position of the processing table. The laser output is controlled based on the commanded speed, and during deceleration, the laser output is controlled based on the moving speed of the processing table.

Effects According to the above configuration, the laser output is controlled based on the command speed when the processing table is accelerating and traveling, and the laser output is controlled based on the moving speed of the processing table during deceleration, so that gouging and There will be no uncut parts.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the principle of the present invention will be explained here.

FIG. 3 shows a graph of the temporal relationship between the commanded speed from the numerical control device and the actual processing table speed, and the temporal relationship between laser output.

Generally, the speed of the table lags behind the command as shown in the following equation.

However, δ: table delay amount (on) F: table speed Kp: position loop gain Ts: smoothing time constant On the other hand, in the present invention, when accelerating table movement, the laser output is performed at the command speed from the numerical control device. This eliminates gouging due to thermal delay at the beginning of acceleration.

Note that when switching is performed at table speed, gouging occurs without penetration. On the other hand, when decelerating, as is clear from equation (1) and Figure 3, there is a time delay between the commanded speed and the table speed, and if the laser output is controlled by the commanded speed, δ of equation (1) This results in some uncut parts. Therefore, during deceleration, if the laser output is switched at the table speed, no uncut material will be left. In other words, the laser output is controlled by the command speed when the processing table is accelerating and moving normally, and the laser output is controlled by the table movement speed when it decelerates to a stop and when in-position checking is performed. be.

Next, a detailed explanation will be given based on FIG.

FIG. 1 shows a block diagram of a numerical control device for a laser processing machine, which has a laser oscillator, a processing table for mounting and supporting a workpiece, and a servo motor for moving this table.

That is, as shown in FIG. 1, the numerical control device includes a position and laser command unit 1 that outputs control commands from an analysis unit based on numerical control codes by dividing them into position data and laser control data, and A speed command unit 3 converts a position command based on the data into speed data and outputs it to the servo motor 2 for table movement to control the speed of the servo motor 2, and the output and frequency of the laser oscillator 4 based on the laser control data. , a laser control section 5 that controls the duty, and a position detector 6 that detects the position of the table.

Next, the operation will be explained based on FIG.

When there is a movement command from the analysis section based on a numerical control code, the 1-position and laser command section 1 informs the laser control section 5 and the speed command section 3 whether the table is in an acceleration, steady state, or deceleration state. The laser control unit 5 controls acceleration, steady state,
Depending on each state of deceleration, position data is distributed to one position and either a commanded position from the laser command section 1 or an actual position of the table from the position detector 6. In other words, if the vehicle is decelerating, the data from the position detector 6
Detects whether it is in the imposition zone,
If you enter the imposition zone.

Turn the laser output to a stopped or idle state. Needless to say, the laser output is maintained at the set state when the vehicle is out of the in-position zone, and the laser output is output at the set state unless deceleration is in progress. Note that it is effective in processing thin plates to multiply the laser output in the set state by a gradient coefficient determined by the adjustment time constant.

Effects of the Invention As described above, according to the configuration of the present invention, the laser output is controlled based on the command speed when the processing table is accelerated and traveling, and the laser output is controlled based on the moving speed of the processing table during deceleration. Since the control is performed, gouging or uncut edges do not occur, resulting in a beautiful machined surface and optimal laser processing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a numerical control device for a laser processing machine in an embodiment of the present invention, FIG. 2 is a flow diagram explaining the operation of the device, and FIGS. 3(a) and (b) are FIG. 4 is a graph showing the relationship between each speed and time and the relationship between laser output and time, and FIG. 4 is a diagram showing a schematic configuration of a laser processing machine and its numerical control device. DESCRIPTION OF SYMBOLS 1... Position and laser command part, 2... Servo motor, 3... Speed command part, 4... Laser oscillator, 5...
... Laser control unit, 6... Position detector. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A numerical control device for a laser processing machine consisting of a laser oscillator, a processing table for placing and supporting a workpiece, and a servo motor for moving this processing table, which converts the numerical control code into position data and the laser beam. a position and laser command unit that outputs the divided control data; a speed command unit that controls the speed of the servo motor based on the position data; a laser control unit that controls the output of the laser oscillator based on the laser control data; It is equipped with a position detector that detects the position of the processing table, and controls the laser output based on the command speed during acceleration and steady running of the processing table, and controls the laser output based on the moving speed of the processing table when decelerating. A numerical control device for laser processing machines configured to control output.