JPH03155486A - Numerical controller - Google Patents

Abstract

PURPOSE:To execute stable and high accurate laser beam machining by providing a machining condition data controller for executing rising-up and falling- down controls in each machining condition datum based on machining condition command. CONSTITUTION:The machining condition data controller 10 controls the machining condition data (average output, duty, number of frequency, etc.) as exponential function (first-order lag) based on the actual time constant, droop quantity and each machining condition command given from a program analytic part 6 corresponding to each machining condition command stored in a control data storing part 9 and outputs to an output control unit 11. The output control unit 11 obtains oscillator output based on the received machining condition data and the oscillator output (beam output) feedback obtd. from an output detector 13 and outputs to an oscillator 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a numerical control device, and particularly to control of output of processing condition data in laser processing and the like.

[Prior Art] Fig. 4 is a block diagram showing an outline of a control method for outputting processing condition data in conventional laser processing. In Fig. 1, (4) is a paper tape, (5) is a memory of a numerical control device, (6) is the program analysis unit that analyzes the program including machining condition commands during program operation, (II) is the output control unit that controls the oscillator output (beam output), and (12) is the oscillator.

(13) is an output detector that detects the state of the oscillator output (beam output) of the oscillator.

Next, the operation will be explained. When the program operation is executed, the program is read from the paper tape (4) in Figure 4 or the memory of the numerical control device (5), and the machining condition commands (average ratio command: Ssn, duty Command: Figure 4 Ttn.

The program analysis section (6) analyzes the frequency command (Bbn, etc.) and generates machining condition data (average output, duty, etc.).

frequency, etc.) to the output control unit (11) in Fig. 4. Output side (wholesale unit has processing condition data and (1)
Based on the oscillator output (beam output) feedback obtained from the output detector (3), the oscillator output (beam output) is determined and output to the oscillator (12).

[Problems to be Solved by the Invention] Since the conventional numerical control device is configured as described above, for example, the following program is included in the control method for outputting processing condition data in laser processing.

GOI XIOYIOSsl Ttl Bbl;
GOI XIOYIOSs2 Tt2 Bb2;
GOI XIOYIOSs3 Tt3 Bb3;
In addition, in the above, Ssn, Ttn, and Bbn are processing condition commands (Ssn: average output command, Ttn: duty command, Bbn: frequency command), and sn, t
n, bn.

is variable data.

When the above program is executed, the program is read from the paper tape (4) in Figure 4 or from the memory of the numerical control device (5), and the program analysis section (6) issues a machining condition command (S
sn Knee 1 output command tn: Duty command, Bb
n: frequency command) is analyzed and the output control unit shown in Figure 4 is
/ Output to (11). Next, the output control unit (Ill) shown in Figure 4 generates an oscillator based on the 5sn (average output), Ttn (duty), Bbn (frequency), and the oscillator output (beam output) feedback obtained from the output detector (13). Find the output and output it to the oscillator (12) (
The oscillator output is controlled in a closed loop as shown in FIG. 4).

Here, the machining condition commands (average output command, duty command 9 frequency command) output to the output control unit (11) in Fig. 4 respond quickly in steps as shown in Fig. 5, but the output detection Due to delays in the oscillator (13) or differences in response for each machining condition, the oscillator output may overshoot as shown in Figure 5B (a) or as shown in Figure 5B (b) when changing the machining condition command. This may cause problems such as undershoot.

Therefore, when switching the machining condition commands (average output command, duty command, 2 frequency commands), melting of the workpiece due to large human heat (at the time of overshoot a in Fig. 5B) may be reduced or the heat input may be small (Fig. 5B). (b = undershoot), the workpiece was missed and high-precision machining was not possible.

This invention was made in order to solve the above-mentioned problems, and it automatically and optimally processes these commands at the rise and fall of machining condition commands (average output command, duty command, 9 frequency commands, etc.). The purpose of the present invention is to obtain a numerical control device that can stabilize the oscillator output (beam output) by controlling it (accommodating the delay of the output detector, etc.) and improve the processing accuracy in laser processing and the like.

[Means for Solving the Problems] A numerical control device according to the present invention has a rise time constant for each rise time constant and a fall time constant for adjusting the response timing of a plurality of processing condition data (average output, duty, frequency, etc.). A basic time constant setting section that sets constants, a basic time constant storage section that stores those time constants, and each rise of each machining condition command (average output command, duty command 1 frequency command, etc.).

and a command determination unit that determines each falling edge, and a time constant switching unit that switches each time constant at each rising edge and each falling edge of each machining condition command.Control data storage that stores data for controlling the two time constants. A machining condition data control section is provided which controls each rise and fall of each machining condition data based on the stored data and machining condition commands issued by a program or the like.

[Function] In the numerical control device of the present invention, the machining condition commands (average output command, duty command 1 frequency command, etc.) are automatically and optimally (output detector delay etc.).

In addition, the time constants corresponding to each command can be set separately for rising and falling times in the basic time constant setting section, allowing control to be controlled with different time constants for rising and falling times, allowing better timing to match the movement of the processing table. Can be done.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is the setting display device, and (2) is the basic time constant setting section, which sets the rise time constant and fall time constant of each machining condition command (average output command, duty command 2 frequency command, etc.) This time constant is stored in the basic time constant storage section (3). (4) with paper tape (5)
is the memory of the numerical control device, and during program operation, the program is read from these, analyzed by the program analysis section (6), and issued to each control section. (7) is a command determining section that determines the rise and fall of this machining condition command. (8) is stored in a control data storage section for storing each data for controlling nine lines in a time constant switching section that switches the time constant at the rise and fall of the machining condition command.

(10) is a machining condition data control unit that generates machining condition data (average output, duty, frequency, etc.) for controlling the oscillator output (beam output) based on the machining condition command and the data in the control data storage unit (9). This is an exponential function (-order lag) control. (11) is an output control unit that calculates the oscillator output (beam output) based on this processing condition data and the oscillator output (beam output) feedback obtained from the output detector (13) and outputs it to the oscillator (12). be.

Next, the operation will be explained.

First, using the setting display device (1) in Fig. 1, the basic time constant setting section (2) sets each rising time constant (T sa,
T ta, T ba, etc.), and falling time constant (
T sr, T tr, T br, etc.) are input and stored in the basic time constant storage section (3).

Next, when the program operation is executed, the paper tape (
4) Or the program is read from the memory (5) of the numerical control device, the program is analyzed by the program analysis section (6), and machining condition commands (average output command, duty command 1
frequency command, etc.). The command determination section (7) in Figure 1
) informs the time constant switching section (8) of the changes in the rising and falling edges of each machining condition command. The time constant switching section (8) in FIG. 1 selects a time constant corresponding to each command and a change in the command from the basic time constant storage section (3) and outputs it to the control data storage section (9). At this time, the droop amount is calculated based on the selected time constant and the previous machining condition data output stored in the control data storage section (9), and is output to the control data storage section (9).

The machining condition data control unit (10) in FIG. Based on the machining condition command, machining condition data (
(average output, duty, frequency, etc.) is controlled exponentially (-order lag) and output to the output control unit (11). Also, at this time, the machining condition data control unit (lO) stores each outputted machining condition data in the control data storage unit (9).

A new droop amount is calculated based on each machining condition data, each machining condition command given from the program analysis section (6), and the droop amount stored in the control data storage section (9), and is stored in the control data storage section (9). Remember. The output control unit (11) receives the received machining condition data and the output detector (11).
3) Obtain the oscillator output based on the oscillator output (beam output) feedback obtained from step 3) and output it to the oscillator (12).

Note that although the above embodiment shows an example of output control of a laser processing machine, the present invention is not limited to this.
It is also applied to wire-cut electrical discharge machines, gas cutting machines, etc., and has similar effects.

Furthermore, depending on the machining characteristics, not only inter-exponential R (-order lag) control but also linear quadratic lag control can naturally have similar effects.

[Effects of the Invention] As described above, according to the present invention, each rise time constant and each fall time constant of processing condition data (average output, duty, frequency, etc.) for controlling two oscillator outputs (beam outputs) can be freely adjusted to smoothly change the response timing to match the delay of the output detector, etc., and can prevent overshoot and undershoot of the oscillator output.9. Alternatively, there is an effect that stable and highly accurate laser processing can be performed to avoid becoming too small. In addition, time constants are provided for rising and falling times.

It can be switched to match the movement of the processing table, which has the effect of enabling highly accurate laser processing.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram according to an embodiment of the present invention, FIG. 2 is a transition diagram of input/output data of the output control unit (11) of FIG. 1 according to the present invention, and FIG. Fig. 4 is a block diagram functionally showing the conventional oscillator output (laser output) control method.
Figure 5 shows the output control unit of Figure 4 in the prior art (
It is a transition diagram of the input/output data of U). Note that the same reference numerals in Figure 9 indicate the same or equivalent parts.

Claims (1)

[Claims] In a numerical control device that controls a machine tool such as a laser processing machine, a basic time constant setting unit that sets each rise time constant and each fall time constant for adjusting the response timing of a plurality of processing condition data; A basic time constant storage unit that stores those time constants, a command determination unit that determines each rise and fall of each machining condition command, and each time at each rise and fall of each machining condition command. A time constant switching section for switching constants, a control data storage section for storing data for main control, and processing condition data for each processing condition based on this stored data and processing condition commands issued by a program, etc. Each rise of
and a processing condition data control unit that controls each fall.