JP3159632B2 - Laser processing machine system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing machine system for performing laser processing such as cutting and welding on a workpiece using laser light.

[0002]

2. Description of the Related Art A two-dimensional laser processing machine is employed for processing a flat plate at high speed and with high accuracy in a non-contact manner. In a two-dimensional laser processing machine, a processing head is controlled in X, Y, and Z axes, and a workpiece (hereinafter, appropriately referred to as a workpiece) is processed using a laser beam guided from a laser oscillator and output from the tip of the processing head. Generally, it is not possible to detect a blow-up phenomenon (hereinafter, appropriately referred to as burning) occurring during processing, and it is almost always found after burning occurs during processing.

Here, the configuration of a general two-dimensional laser beam machine will be described with reference to FIGS. A processing head 101 is attached to the tip of the Z axis 100. Reference numeral 108 denotes a Z-axis guide for guiding the movement of the processing head 101 in the direction of the arrow Z by the motor M3, 109 denotes a Y-axis guide for guiding the movement of the processing head 101 in the direction of the arrow Y by the motor M2, and 110 denotes the processing table 102 by the motor M1. Is an X-axis guide that guides the movement in the arrow X direction. The motors M1 to M3 are driven by a drive signal M from the control device 104 so that the spot of the laser beam L follows the processing line K while keeping the distance of the processing head 101 to the workpiece W constant according to the processing program. Controlled. In addition, a distance sensor (not shown) attached to the tip of the processing head 101 measures the distance between the workpiece W and the processing head 101 in order to keep the distance of the processing head 101 to the work W constant, and sends the result to the control device 104. The measurement signal is fed back to control the spot of the laser beam L finally. Further, a hand operation box 107 used for detecting a focal position and the like is connected to the control device 104. 105 is a laser oscillator for outputting laser light, and 103 is the X, Y, Z
Is a processing machine main body including a three-axis direction guide mechanism and the like.

[0004] Further, as a laser processing machine, a detecting means for detecting light generated from the work by irradiating a laser beam, a control unit for controlling the laser oscillator and to which a detected light amount signal detected by the detecting means is inputted. There is known a configuration that is configured to be able to monitor the processing state of a workpiece by a change in a detected light amount signal detected by the detection unit. For example, JP-A-6-91384 and JP-A-6-142960 are known.

[0005]

In [0006] the conventional laser processing system, such as, at the time of detecting the presence or absence of risk of blow-up phenomena during processing (burning), the criterion value (information) If the value to be used as the reference is different depending on the state of the system and the material and thickness of the workpiece, there is a risk that erroneous detection is performed and burning occurs.

In addition, when burning actually occurs or when burning may occur, the operator manually modifies (changes) the processing conditions through trial and error, so that each worker corrects the processing condition. The procedures (points) to be performed and the reset processing conditions were different, and the efficiency of the processing for correcting the processing conditions was low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and corrects the level of burning detection in accordance with the state of the system and the material and thickness of the work to be processed. it is intended to obtain a laser beam machine system capable of performing also correct burning sense against the material and plate thickness of the workpiece.

Another object of the present invention is to provide a laser processing machine system that enables efficient correction of processing conditions.

[0009]

According to the present invention, there is provided a laser beam machine system comprising: a laser beam output from a laser oscillator;
A processing machine for processing by irradiating the workpiece, and detecting means for detecting light reflected from the top Symbol workpiece, and a control unit for inputting a detection signal from said detecting means to control said laser oscillator In a laser processing machine system with
The control unit performs burning according to changes in the laser path length.
Distance-based burning detection information correction hand that corrects detection information
Step, burning detection information according to the material of the workpiece
Correcting means corresponding to the material to be corrected, according to the thickness of the workpiece
Thickness correction means to correct the burning detection information
At least one modification and at least one modification as described above.
Means for detecting burning based on the burning detection information corrected by the means and determining the possibility of occurrence of burning, and correcting processing conditions when it is determined that there is a possibility of occurrence of burning. comprising a processing condition modifying unit, a procedure storage means for storing a procedure modified in the machining condition modification unit, a machining condition registration means for registering the modified machining conditions, and the distance corresponding
The burning detection information correcting means is configured to move the processing head.
Above according to the attenuation of the reflected light based on the change in the optical path length due to
The strength of the detection signal input to the control unit from the detection means
Correction so that the strength of the detection signal is kept constant.
And the material-corresponding correction means is a material for the workpiece.
When the attenuation of reflected light changes depending on the quality,
Controlled by detection means according to the laser output being irradiated
Correct the strength of the detection signal input to the
To maintain the strength of the
Thickness correction means attenuates reflected light depending on the thickness of the workpiece
Changes, the laser beam irradiating the workpiece
The detection signal input to the control unit from the detection means according to the
Signal strength to keep the strength of the above detection signal constant.
The correction is made as follows.

[0010]

[0011]

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a two-dimensional laser beam machine system monitoring the occurrence of burning during cutting. 1
A is a detection processing unit that constitutes a burning detection unit that detects burning, 1B is a light receiving element that constitutes a burning detection unit, 100 is a Z-axis unit that can move the processing head 101 in the Z-axis direction, 102 is a processing table, 103
Is a processing machine main body, 104 is a control device of the processing machine main body 103,
Reference numeral 105 denotes a laser oscillator that generates a laser beam used for processing. Reference numeral 2 denotes a burning detection information correction unit incorporated in an NC control unit in the control device 104, which is a state of the processing machine system, that is, a light receiving element 1 from the processing head 101.
A distance-corresponding burning detection information modifying unit 6 for modifying the burning detection information according to the change in the optical path length up to B; a material-corresponding burning detection information modifying unit 7 for modifying the burning detection information according to the material of the workpiece; A burning detection information correction unit 8 that corrects the burning detection information based on the thickness is provided. Reference numeral 3 denotes a processing condition correction unit incorporated in the NC control unit, and the burning detection information correction unit 2
If there is a possibility that burning may occur even though processing is performed using the burning detection information corrected in step 2, it is necessary to perform correction so that processing can be performed stably and store the procedure that performed the correction. A processing condition correction procedure storage unit 9 is provided. Reference numeral 4 denotes a correction processing condition storage unit incorporated in the NC control unit, and when burning detection is performed based on the burning detection information corrected by the burning detection information correction unit 2, burning may occur. In such a case, there is a burning avoiding processing condition storage unit 10 that corrects the processing conditions and stores the corrected processing conditions.

FIG. 2 is a schematic diagram of a burning detecting device of a two-dimensional laser beam machine system for monitoring burning during cutting. In FIG. 2, reference numeral 1 denotes a burning detection unit that monitors reflected light generated on the surface of the workpiece and monitors the occurrence of burning, 104 a detection information correction unit 2 that corrects the burning detection information, and further burning occurs. In this case, a processing condition is corrected, but a processing condition correction unit (not shown) that stores a procedure required for correction, and a corrected processing condition storage unit (not shown) that stores the corrected processing condition as a new processing condition. Is an NC control unit provided therein. 10
Reference numeral 1 denotes a processing head; 103, a processing machine main body; 105, a laser oscillator for generating a laser beam used for processing; 106, an operation unit that sends an instruction to an NC control unit;
This is a hand-held operation box for making a slight correction of 01. The detection information correction unit 2 includes a burning detection information storage unit 11, a burning detection information reading unit 12, and a system state storage unit 1.
3, a burning detection information correcting unit 14 based on a distance, a processing material storage unit 16, a burning detection information correcting unit 17 based on a processing material, a processing output setting unit 18, and a burning detection information correcting unit 19 based on a plate thickness. I have.

FIG. 3 is a flowchart of a two-dimensional laser beam machine system for monitoring burning during cutting. Hereinafter, the monitoring operation of the burning will be described with reference to FIG. Read burning detection information Burning detecting information reading operations (step S1). In the burning detection information end completion determining step (step S2) for determining whether the correction of the burning detection information has been completed, if the correction of the burning detection information has not been completed, the processing machine system state is checked in step S3. Burning detection information correction step based on system state (step S4)
To correct the burning detection information according to the state of the system. Subsequently, the workpiece (workpiece) being processed in step S5.
The burning detection information is corrected according to the material of the workpiece in a burning detection information correcting step (step S6) based on the material of the workpiece. Subsequently, in step S7, a change in the processing output is examined based on the feature that the processing output varies according to the thickness of the plate being processed, and in the burning detection information correction step based on the thickness of the work (step S8), the burning is detected in accordance with the thickness of the work. Correct the information. When the correction of the burning detection information is completed, steps S2 to S9 are performed.
Then, the detection of burning during processing is started, and it is determined in step S10 whether burning during processing is likely to occur.
Start the modifications. In step S12, the correction procedure is stored in the processing condition correction procedure storage unit 9. In step S13, it is determined whether the possibility of occurrence of burning can be avoided. If the possibility of occurrence of burning can be avoided, the processing condition corrected in step 14 is registered in the corrected processing condition storage unit 4 as a new processing condition.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 corrects the burning detection information in accordance with the state of the system used in the two-dimensional laser processing machine system, that is, the change in the optical path length from the tip of the processing head 101 to the reflected light detection unit (light receiving element) 1B (FIG. Step S during 3
3 (corresponding to S4) showing the details of the distance-based burning detection information correction unit. In the figure, 1A, 1B, 10
Reference numerals 0 to 103 and 105 are the same as those in FIG. 1 described above, and a description thereof will be omitted. Reference numeral 104 denotes a control device of the processing machine main body 103. The distance-based burning detection information correction unit 6 in the control device 104 reads the burning detection information stored in the burning detection information storage unit 11 in the control device 104. A burning detection information reading unit 12 to be read,
The system status stored in the system status storage unit 13 in the control device 104 is monitored, the change in the optical path length from the tip of the processing head to the reflected light detection unit is calculated, and the burning read out based on the calculated result. It is composed of a burning detection information correction unit 14 based on the distance for correcting the detection information.

FIG. 5 is a view showing a flowchart of the distance-based burning detection information correcting section 6 shown in FIG. The operation for correcting the distance-based burning detection condition will be described below with reference to FIG. Burning detection information stored in the control parameter storage section in burning detection information reading unit 12 reads (step S1), the processing head that stores the actual position of the working head of the current in the system state storage unit 13 The current position is taken out (step S16),
An increase in the optical path length from the reference position is calculated from the current value (step S17), and a correction coefficient is calculated from the increase in the optical path length calculated in step S17.

The correction coefficient is obtained by a simple arithmetic operation. α = △ L / constant The numerator constant is determined from the configuration of the processing machine system. In this embodiment, the numerator constant is set to 250. If the correction is to be performed more finely, it becomes possible by changing this constant.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 shows details of a material-corresponding burning detection condition correction unit that corrects the burning detection information (corresponding to S5 and S6 in FIG. 3) in accordance with the material of the workpiece used in the two-dimensional laser processing machine system. FIG. In the figure, 1A,
1B, 100 to 103 and 105 are the same as those in FIG. 1 described above, and a description thereof will be omitted. Reference numeral 104 denotes a control device of the processing machine main body 103. The material-corresponding burning detection information correction unit 7 in the control device 104 includes a burning detection information reading unit 12 that reads out the burning detection information stored in the burning detection information storage unit 11 in the control device 104. Material storage unit 1 in 104
The burning detection information correction unit 17 is configured to correct the burning detection information read out based on the material information stored in step 6.

FIG. 7 is a diagram showing a flowchart of the material-corresponding burning detection condition correction unit 7 shown in FIG. Hereinafter, the operation of correcting the burning detection condition for each material of the work will be described with reference to FIG. Load the burning detection information stored in the control parameter storage section in burning detection information reading unit 12 (step S1), the the material of the workpiece currently being processed is taken out from the processing condition parameter storage unit (step S20), the It is determined whether the reflectance of the material of the work is high or low (step S21), and a correction coefficient is determined from the level of the reflectance calculated in step S21 (step S22).

Embodiment 4 FIG . Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8 shows the details of a thickness-corresponding burning detection condition correction unit that corrects burning detection information (corresponding to S7 and S8 in FIG. 3) according to the thickness of a workpiece used in a two-dimensional laser processing machine system. FIG. In the figure, 1
A, 1B, 100 to 103 and 105 are the same as those in FIG. 1 described above, and the description is omitted. Reference numeral 104 denotes a control device of the processing machine main body 103. The thickness detection burning detection information correction unit 8 in the control device 104 stores the burning detection information stored in the burning detection information storage unit 11 in the control device 104. A burning detection information reading unit 12 for reading information; and a burning detection information correction unit 19 for correcting the read burning detection information based on the processing output information set by the processing output setting unit 18 in the control device 104. I have.

FIG. 9 is a view showing a flowchart of the burning detection condition correction unit 8 shown in FIG. Hereinafter, the operation of correcting the burning detection condition for each sheet thickness will be described with reference to FIG. Load the burning detection information stored in the control parameter storage section in burning detection information reading unit 12 (step S1), the output P of the currently processed
w is extracted from the processing condition parameter storage unit (step S24), and a correction coefficient is calculated from the output (step S25).

The correction coefficient can be obtained by a simple arithmetic operation. γ = Pw / constant The numerator constant is determined from the processing machine system configuration. In this embodiment, the numerator constant is set to 250. If the correction is to be performed more finely, it becomes possible by changing this constant.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 shows a case where burning is likely to occur even though processing is performed using the burning detection information corrected by the correcting means according to Embodiments 1 to 4 so that processing can be performed stably. FIG. 8 is a diagram showing a processing condition correction procedure storage unit that can store a procedure in which correction has been performed. In the figure, 1A, 1B, 100 to 103
And 105 are the same as those in FIG. 1 described above, and the description is omitted. Reference numeral 104 denotes a control device of the processing machine main body 103. The processing condition correction procedure storage unit 9 uses the processing condition correction procedure registration unit 22 in the processing condition parameter storage unit in which the correction procedure is stored, and processes using the procedure stored in the processing condition correction procedure registration unit. A processing condition correction unit 20 for correcting conditions, and a processing condition correction procedure storage processing unit 21 for adding a correction procedure to the procedure when the procedure is corrected.
It is composed of With such a configuration, it is possible to automatically and efficiently correct the processing conditions without bothering the operator.

Embodiment 6 FIG . Next, a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows that, although the burning is performed using the burning detection information corrected by the correcting means according to the first to fourth embodiments, there is a possibility that the burning may occur. Performed and corrected machining conditions are registered as new machining conditions (stored)
FIG. 7 is a diagram showing a burning avoiding processing condition storage unit that can perform the processing. In the figure, 1A, 1B, 100 to 103 and 1
05 is the same as that of FIG. 1 described above, and the description is omitted. Reference numeral 104 denotes a control device of the processing machine main body 103. The burning avoiding processing condition storage unit 10 refers to the correction processing condition registration unit 25 in the processing condition parameter storage unit in which the correction procedure is stored, and the processing conditions stored in the correction processing condition registration unit 25, It comprises a processing condition correction unit 23 for correcting processing conditions and a corrected processing condition storage processing unit 24 for registering the corrected processing conditions.

FIG. 12 is a flowchart of the burning avoiding processing condition storage unit 10 shown in FIG. The processing condition correction procedure storing operation will be described below with reference to FIG.
Burning detection is started (step S27). If there is a possibility of occurrence of burning (step S28), the processing conditions are corrected (step S30) by referring to the correction processing conditions and correction procedures already stored (step S29). ) To start. Until the possibility of the occurrence of burning can be avoided, the work of correcting the processing conditions continues, and the corrected processing condition storage processing unit 24 stores the processing conditions corrected in step S30 as burning avoided corrected processing condition information. When the possibility of occurrence of burning can be avoided (step S32), it is additionally registered as a new correction processing condition (step S33). With such a configuration, registration of new machining conditions is automatically and efficiently performed without bothering the operator.

By the way, in the above embodiment, the case where the present invention is built in the control device and used for a two-dimensional laser processing machine has been described as an example. However, the present invention is installed outside the control device to detect burning and to correct the processing conditions. It is also possible to carry out.

In the above embodiment, the case where the burning detection unit (light receiving element 1B) is mounted above the Z axis has been described as an example. And the same effects as in the above embodiment can be obtained.

Although the case of detecting the occurrence of burning during cutting processing has been described as an example, the present invention can be applied to the detection of blow-up during piercing.

[0030]

Since the present invention is configured as described above, it has the following effects.

By detecting the occurrence of burning, correcting the processing conditions, and registering the processing conditions, it is possible to appropriately detect the occurrence of burning for individual workpieces, and In the case of changing, for example, it is possible to efficiently correct the processing conditions, and it is possible to efficiently perform good processing on individual workpieces.

In addition, the attenuation of the reflected light is corrected in accordance with the change in the optical path length from the processing head to the detecting means, and the occurrence of burning is detected. However, it is possible to perform the effect of appropriately detecting and preventing the occurrence of burning.

Further, by detecting the occurrence of burning by correcting the attenuation of the reflected light in accordance with the material of the workpiece, it is possible to detect the occurrence of appropriate burning for various workpieces having different materials. And prevention can be performed.

Further, by correcting the attenuation of the reflected light in accordance with the thickness of the workpiece and detecting the occurrence of burning, appropriate burn generation can be performed for various workpieces having different thicknesses. The effect that the detection and prevention of the error can be performed is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a laser processing machine system according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a burning detection device of the laser beam machine according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart of a burning detection operation of the laser beam machine according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing details of a distance-based burning detection condition correction unit of the laser beam machine according to Embodiment 2 of the present invention.

FIG. 5 is a view showing a flowchart of a distance-based burning detection condition correction unit of the laser beam machine according to Embodiment 2 of the present invention.

FIG. 6 is a view showing details of a material-corresponding burning detection condition correction unit of the laser beam machine according to Embodiment 3 of the present invention.

FIG. 7 is a diagram showing a flowchart of a material-corresponding burning detection condition correction unit of the laser beam machine according to Embodiment 3 of the present invention.

FIG. 8 is a diagram showing details of a thickness-dependent burning detection condition correction unit of a laser beam machine according to Embodiment 4 of the present invention.

FIG. 9 is a diagram showing a flowchart of a thickness-dependent burning detection condition correction unit of the laser beam machine according to Embodiment 4 of the present invention.

FIG. 10 is a diagram showing a processing condition correction procedure storage unit of a laser processing machine according to Embodiment 5 of the present invention.

FIG. 11 is a diagram showing a burning avoiding processing condition storage unit of a laser beam machine according to Embodiment 6 of the present invention.

FIG. 12 is a flowchart of a burning avoiding processing condition storage unit of the laser beam machine according to Embodiment 6 of the present invention.

FIG. 13 is a configuration diagram of a conventional general two-dimensional laser beam machine.

FIG. 14 is a configuration diagram of each axis of a conventional general two-dimensional laser beam machine.

[Explanation of symbols]

1A, 1B Burning detection section, 2 Burning detection information correction section, 3 Processing condition correction section, 4 Correction processing condition storage section, 6 Distance burning detection information correction section, 7 Material burning detection information correction section, 8 Sheet thickness burning Detection information correction unit, 9 Processing condition correction procedure storage unit, 10
Burning avoidance processing condition storage unit, 11 burning detection information storage unit, 101 processing head, 103 processing table, 104 control device, 105 laser oscillator.

Claims (1)

(57) [Claims] The method according to claim 1 laser beam output from the laser oscillator
A processing machine for processing by irradiating the workpiece, and detecting means for detecting light reflected from the top Symbol workpiece, and a control unit for inputting a detection signal from said detecting means to control said laser oscillator In the laser processing machine system provided with the above, the control unit performs the burning in accordance with a change in the laser optical path length.
Distance-based burning detection information correction hand that corrects detection information
Step, burning detection information according to the material of the workpiece
Correcting means corresponding to the material to be corrected, according to the thickness of the workpiece
Thickness correction means to correct the burning detection information
At least one correcting means, a burning occurrence possibility determining means for detecting a burning based on the burning detection information corrected by the at least one correcting means and determining a burning possibility, and a burning occurrence possibility. Processing condition correction means for correcting a processing condition when it is determined that there is a possibility, procedure storage means for storing a procedure corrected by the processing condition correction means, processing condition registration means for registering the corrected processing condition , To
The distance-corresponding burning detection information correcting means is provided with the processing
Attenuation of reflected light due to change in optical path length due to head movement
Detection input from the detection means to the control unit according to
Correct the signal strength and keep the above detection signal strength constant
The above-mentioned correction means for the material is adapted to reflect the reflected light depending on the material of the workpiece.
When the attenuation of the workpiece changes,
Input from the detection means to the control unit according to the laser output
Correct the strength of the detection signal to keep the strength of the above detection signal constant
The above-mentioned correction means for correcting thickness corresponds to the reflected light depending on the thickness of the workpiece.
When the attenuation of the workpiece changes,
Input from the detection means to the control unit according to the laser output
Correct the strength of the detection signal to keep the strength of the above detection signal constant
A laser processing machine system wherein the correction is performed so as to keep the laser processing machine.