JP2581725B2 - Three-dimensional shape processing laser device - Google Patents

Description

The present invention relates to a three-dimensional shape processing laser device for performing three-dimensional processing, and more particularly to a three-dimensional shape processing laser device having a function of confirming teaching data.

[Conventional technology]

CNC laser processing machines that combine a laser oscillator and a numerical controller (CNC) have been widely used. By combining the high-speed processing of a laser processing machine with the features of a numerical control device (CNC) capable of performing complex contour control, it has become possible to process complex shapes at high speed without contact.
In particular, a three-dimensional shape processing laser device capable of three-dimensional processing, which was impossible with a conventional punch press, nibbling machine, or the like, has come to be put to practical use. In order to perform three-dimensional processing with a three-dimensional shape processing laser device, it is necessary to control the attitude of the tip nozzle in addition to controlling the X, Y, and Z axes.
Normally, nozzle control is controlled as an α axis and a β axis. Therefore, in the three-dimensional shape processing laser device, the processing command is X,
It is necessary to control the Y and Z axes and the α and β axes.

It is often very difficult to program these commands from drawings. Generally, the tip of the nozzle is aligned with the actual workpiece, shape data is collected, and NC commands are created from this data. This is performed manually by an operator operating the teaching box.

[Problems to be solved by the invention]

However, in teaching, the nozzle is positioned on the work by manual operation, the attitude of the nozzle is controlled, and then the storage button is operated, and the position of each axis at that time becomes an NC command. As a result, the accuracy of the NC command obtained in teaching, that is, the teaching data depends on the nozzle positioning state and is generally not so high.

Further, in the teaching, since discrete positions are collected, the nozzle moves along a defined curve between the teaching point and the next teaching point, so that a large error may occur in an intermediate path depending on the shape of the work.

If the error at this time is too large to be absorbed by the profile control, processing of that part becomes impossible, and a part that cannot be processed remains.

The present invention has been made in view of such a point,
It is an object of the present invention to provide a three-dimensional shape processing laser device having a function of confirming teaching data.

[Means for solving the problem]

In the present invention, in order to solve the above problems, in a three-dimensional shape processing laser device for performing three-dimensional processing, a teaching box for teaching an NC command including the trajectory of the nozzle tip and the attitude of the nozzle, and a command for storing the NC command A storage unit, an NC command execution unit that executes the NC command, a detector that is provided near the nozzle tip and detects a gap between the nozzle tip and the work, and controls the gap to be a constant value. And performing the control at the same time during the execution of the NC command, to determine the deviation amount between the position on the trajectory of the nozzle tip of the NC command and the position of the nozzle tip calculated from the gap, When the deviation exceeds an allowable value, a teaching data confirming means for stopping execution of the NC command, and a three-dimensional shape processing laser device comprising: It is provided.

Further, in a three-dimensional shape processing laser device for performing three-dimensional processing, a teaching box for teaching an NC command including a trajectory of a nozzle tip and a nozzle attitude, command storage means for storing the NC command, and executing the NC command NC command execution means to perform, a detector provided near the nozzle tip, for detecting the gap between the nozzle tip and the work, the NC
During execution of the command, when the deviation amount between the gap and the standard gap exceeds an allowable value, teaching data confirmation means for stopping the execution of the NC command, and a three-dimensional shape processing laser device comprising: Is provided.

[Action]

Tracing control is performed during the execution of the NC command, so that the gap between the tip of the nozzle and the work becomes a constant value. As a result, the deviation between the position on the trajectory of the nozzle tip of the NC command and the position of the nozzle tip calculated from the gap is detected, and when the deviation exceeds the allowable value, the execution of the NC command is stopped. .

Also, only the NC command is executed without performing the copying control,
When the deviation between the gap between the nozzle tip and the workpiece and the standard gap exceeds the allowable value, the execution of the NC command is stopped.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a three-dimensional shape processing laser device according to one embodiment of the present invention. In the figure, reference numeral 10 denotes a control device that stores and executes an NC command and performs a copying control.

11 is a processor for controlling the whole, 12 is a memory for storing a control program, and 13 is an interface circuit with a teaching box. Here, an RS232C interface is used. Reference numeral 14 denotes a display control circuit which creates and transmits display data. A distance detection circuit 15 receives a signal from the distance detector, converts the signal into an analog signal, and allows the processor 11 to capture the signal.

Reference numeral 16 denotes a DA converter, which converts a speed command from the processor 11 into an analog voltage. Reference numeral 17 denotes a servo amplifier that drives a servo motor. A position control circuit 18 detects a position signal from a position detector attached to the servomotor.

Reference numeral 20 denotes a teaching box, which is an operation panel for an operator to perform teaching. Reference numeral 21 denotes a processor, which controls the entire teaching box 20. twenty two
Is a memory for temporarily storing teaching data and the like, 23 is a keyboard, 24 is a display device for displaying simple data, and a liquid crystal display device is used. Reference numeral 25 denotes an interface circuit for coupling with the control device 10.

Reference numeral 30 denotes a display device, which receives a video signal from the display control circuit 14 to perform various displays, and also displays an alarm signal and the like described later.

Reference numeral 41 denotes a position detector of the servomotor 42, and reference numeral 42 denotes a servomotor for driving the profiled shaft. Reference numeral 43 denotes a distance detector which detects a gap between the nozzle 45 and the work 46. Here, a laser measuring device using a semiconductor laser is used. 44 is a laser beam for measurement. In addition, a capacitance distance detector that detects a distance from a capacitance, a magnetic sensor that detects an eddy current to measure a distance, and the like can be used. 47 is a machine table for fixing the work 46.

A laser beam for processing (not shown) is radiated from the nozzle 45 onto the workpiece 46, and processing such as cutting and trimming of the workpiece 46 is performed. In FIG. 1, only a servo system such as a servo motor for a profiled axis is shown, and servo systems for other axes are omitted.

The operator uses the teaching box 20 to bring the tip of the nozzle 45 to the work 46, controls the attitude of the nozzle on the α axis and the β axis, and collects teaching data for each point. This teaching data is stored in the temporary memory 22, and is stored in the memory 12 of the control device for each fixed amount.

After collecting the teaching data, the teaching data is checked before performing the laser processing. At this time, there are the following two methods.

In the first method, the teaching data, that is, the NC command is executed, and at the same time, the copying control is performed. This is effective when the accuracy of teaching data is low.

Here, while executing the NC command, the distance detector 43
From the tip of the nozzle 45
Measures gaps up to 46 and performs tracing control. As a result, the tip of the nozzle 45 is controlled so that the distance from the workpiece 46 is set to a predetermined value by the profile control while basically executing the NC command.

FIG. 2 shows the trajectory of the tip of the nozzle when executing control in accordance with the NC command. In the figure, 45 is a nozzle, 46 is a work, 48 is a trajectory of the tip of the actual nozzle 45, and 49 is a trajectory of teaching (a trajectory of an NC command). During execution, the deviation amount Δε1 between the position of the trajectory 49 of the nozzle tip and the position of the trajectory 48 actually controlled for tracing is obtained as the difference between the position on the trajectory of the nozzle tip and the position calculated from the gap.

When the deviation Δε1 exceeds the allowable range, the execution of the NC command is stopped, and the teaching data is corrected. Also,
At the same time as the stop, an alarm is displayed on the display device 30, and the deviation Δε1
Can be displayed. Furthermore, it is also possible to stop after the end of the block without stopping immediately.

The second method is to execute the NC command without performing the following control. This is useful when teaching data is collected in detail. Figure 3 shows NC
4 shows the trajectory of a nozzle when only a command is executed. In the figure, 45 is a nozzle and 46 is a work. At this time, the actual gap between the tip of the nozzle 45 and the workpiece 46,
When the deviation Δε2 from the standard gap exceeds the allowable range,
Stop execution of NC command. Other alarm signal display devices
Displaying at 30, stopping immediately after the end of the block without stopping immediately can be applied in the same manner as the first method.

Next, the control process described above will be described. FIG. 4 shows a flowchart of the processing of one embodiment of the present invention.
In the figure, the numerical value following S is a step number.

[S1] The NC command (program) is read from the memory 12.

[S2] One block is decoded.

[S3] Check whether there is a copying command. Here, the copying command is issued by a modal G code. If there is no following command, go to S4, otherwise go to S5.

[S4] Since there is no copying command, the NC command is executed as it is.

[S5] Since there is a copying command, the copying control is performed.

[S6] Check whether the deviation is within an allowable range. If it exceeds the allowable range, go to S7. If it is within the allowable range, go to S8.

[S7] Since the deviation exceeds the allowable range, the stop flag is turned on.

[S8] It is checked whether distribution has been completed. If not, go to S4 to continue pulse distribution; if it is finished, go to S9.

[S9] Check whether the stop flag is on. If it is off, go to S10; if it is on, go to S11.

[S10] Check whether the NC command program is completed. If not, the process returns to S1 to continue the process.

[S11] Status information such as the number of stopped blocks and the amount of deviation is displayed.

In the above process, when the amount of variation exceeds the allowable range, the process of that block is terminated and then stopped.However, the execution is directly stopped in [S7], and an alarm is displayed if necessary. It can also be displayed on the device.

〔The invention's effect〕

As described above, in the present invention, the control is performed during the execution of the NC command, and when the deviation amount between the position of the NC command on the trajectory of the nozzle tip and the actual position of the nozzle tip exceeds the allowable value, the NC command is executed. , The teaching data can be easily confirmed and corrected, and reliable teaching data can be obtained.

Also, the NC command is executed without performing the copying control, and the NC command is stopped when the deviation between the gap between the nozzle tip and the workpiece and the standard gap exceeds the allowable value. The teaching data can be easily confirmed and corrected, and reliable teaching data can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a three-dimensional shape processing laser device according to an embodiment of the present invention, FIG. 2 is a diagram showing a locus of a nozzle when performing control in accordance with an NC command, FIG. 3 is a diagram showing a nozzle trajectory when only the NC command is executed, and FIG. 4 is a flowchart of a process according to an embodiment of the present invention. 10 Control device 11 Processor 12 Memory 13 Interface circuit 15 Distance detection circuit 20 Teaching box 21 Processor 22 Memory 25 Interface circuit 43 Distance detector 44 … Measurement laser beam 45 …… Nozzle 46 …… Work

Claims (8)

(57) [Claims] 1. A three-dimensional shape processing laser device for performing three-dimensional processing, a teaching box for teaching an NC command including a trajectory of a nozzle tip and a posture of the nozzle, a command storage unit for storing the NC command, and the NC NC command execution means for executing a command, a detector provided near the nozzle tip and detecting a gap between the nozzle tip and the work, and a control means for performing control so that the gap becomes a constant value. During the execution of the NC command, the copying control is also performed at the same time, and the deviation amount between the position on the trajectory of the nozzle tip of the NC command and the position of the nozzle tip calculated from the gap is determined. And a teaching data confirming means for stopping the execution of the NC command when the distance is exceeded. 2. The method according to claim 1, wherein said teaching data confirmation means issues an alarm together with the stop of execution of said NC command when said deviation amount exceeds said allowable value. 3D shape processing laser device. 3. The teaching data confirming means terminates the block under execution of the NC command and stops when the deviation amount exceeds the allowable value. Item 3. The three-dimensional shape processing laser device according to Item 1. 4. The three-dimensional shape processing laser device according to claim 1, wherein said detector is a laser distance measuring device. 5. A three-dimensional shape processing laser device for performing three-dimensional processing, a teaching box for teaching an NC command including a trajectory of a nozzle tip and a nozzle attitude, a command storage unit for storing the NC command, and the NC NC command execution means for executing a command, a detector provided near the nozzle tip and detecting a gap between the nozzle tip and the work, and a deviation amount between the gap and a standard gap during execution of the NC command. A teaching data confirming means for stopping the execution of the NC command when the allowable value is exceeded, and a three-dimensional shape processing laser device. 6. The teaching data as set forth in claim 5, wherein said teaching data confirmation means issues an alarm together with the stop of execution of said NC command when said deviation amount exceeds said allowable value. 3D shape processing laser device. 7. The teaching data confirming means terminates the block in execution of the NC command and stops when the deviation exceeds the allowable value. Item 3. The three-dimensional shape processing laser device according to Item 1. 8. The three-dimensional shape processing laser device according to claim 5, wherein said detector is a laser distance measuring device.