JPH10263866A - Laser cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid making material wasteful by discontinuing excellent cutting after the generation of defective machining by executing the cutting program next to the suspended position to resume cutting after executing re-piecing to the suspended position of the machining program with a re-piercing condition. SOLUTION: Cutting is started in the direction of an arrow along the cutting path 3 after piercing in a cutting start point SP1 . When the defective cutting part 5 is generated in the middle of cutting in the cutting path 3, excellent cutting in the scheduled path 7 of cutting next to defective cutting part 5 becomes impossible to continue. The execution of the cutting program is temporarily suspended and re-piercing is executed in the suspended position SP2 of the cutting program with the established re-piercing condition by inputting the re-piercing command from the push button of the control panel of a NC device by the operator. Thereafter, the cutting program next to the suspended position SP2 of the cutting program is executed to resume cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laser cutting method.

[0002]

2. Description of the Related Art In laser processing, when cutting or drilling a product at a position distant from an end of a workpiece, piercing (preparing a hole for starting cutting) is required at the start of cutting. It is.

In the case of a laser processing device controlled by an NC device, the above piercing command is included in a product processing program, and is executed by the piercing command after positioning the laser processing head at the cutting start point. It has become.

[0004] The cutting conditions for the piercing described above are NC
It can be registered in advance in the storage device of the device, and the piercing conditions include, for example, laser output,
Assist gas pressure, piercing time, etc. can be specified.

[0005]

In the case of a laser processing apparatus controlled by the above-described NC apparatus, piercing is performed only at a position specified in a cutting processing program. Cannot be implemented.

[0006] Therefore, if a defective machining portion occurs during the cutting process, there is a problem that the defective machining is performed after the defective machining portion, and the material is wasted.

Further, when the cutting process is interrupted by an emergency stop system for preventing the laser processing head from being damaged, the cutting process after the interruption cannot be resumed.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to execute piercing by an external input when good cutting cannot be continued during cutting. Accordingly, it is an object of the present invention to provide a laser cutting method in which good cutting can be restarted.

[0009]

As a means for solving the above-mentioned problems, a laser cutting method according to the first aspect of the present invention is a laser cutting method.
In the laser processing apparatus controlled by the C device, the execution of the cutting program is temporarily interrupted by externally inputting a re-piercing command during the execution of the cutting program, and the set re-piercing processing conditions are simultaneously set. Calling, executing the re-piercing at the machining program interruption position according to the re-piercing machining condition, and then executing the cutting machining program after the machining program interruption position to resume the cutting. is there.

[0010] Therefore, even if a defective machining portion occurs during cutting by the cutting program, the piercing process can be executed by an external input and the cutting process can be restarted. The material is not wasted because the cutting process cannot be continued.

According to a second aspect of the present invention, in the laser processing apparatus controlled by the NC apparatus, after the re-piercing is executed by externally inputting a re-piercing command for the cutting processing interrupted by the emergency stop. Therefore, it is intended to restart the cutting process. Therefore, the cutting process interrupted by the emergency stop can be restarted by externally inputting the re-piercing command. There is no interruption of the cutting process.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an operation explanatory diagram when the laser cutting method according to the present invention is applied to cutting by an NC control laser processing device (not shown). The laser processing apparatus may be any type such as a two-axis optical axis moving type, a two-axis material moving type, or a one-axis optical axis moving single-axis material moving type.

Hereinafter, the respective cutting situations shown in FIGS. 1A to 1F will be described.

[0014] Figure 1 (a): is positioned laser machining head 1 to the cutting start point SP ₁ by the cutting machining program, piercing the laser beam and the assist gas from the nozzle of the laser machining head 1 by irradiating the workpiece W Perform processing.

FIG. 1B: The start point SP ₁
After the piercing process, the cutting process is started in the direction of the arrow along the cutting path 3. FIG. 1 (c): A processing defect 5 occurs during the processing of the cutting path 3. FIG. 1D: It becomes impossible to continue good cutting on the planned cutting path 7 after the defective part 5.

FIG. 1 (e): When the operator inputs a re-piercing command from a push button on the operation panel of the NC device, the execution of the cutting program is temporarily interrupted, and at the same time, the set re-piercing conditions are implementing the re-piercing the cutting program interruption position SP _2.

FIG. 1 (f): After the re-piercing of SP ₂ is performed, the cutting program after the machining program interruption position SP ₂ is executed to resume cutting. FIG.
Is a flowchart of the procedure of the laser cutting method described in FIG. 1, and the flowchart will be described below.

In step S1, a cutting program is executed, and in the next step S2, laser cutting is started. When laser cutting is started, it is determined in step S3 whether there is an external input of a re-piercing command. If there is an external input, execution of the cutting program is temporarily suspended in step S4. That is, interruption of the execution of the cutting program means interruption of laser cutting.

Then, the re-piercing processing condition preset in the processing condition storage device of the NC device is called, and the execution of the cutting program in the above-described step S4 is temporarily stopped by the re-piercing processing condition. Re-piercing is performed at the position of the command value (XY coordinate value). After the re-piercing, the cutting program after the interruption of the cutting program interrupted in step S4 is executed, and laser cutting is started in step S2.

In the above condition determination in step S3,
If there is no external input of the re-piercing command, step S7
Then, it is determined whether the cutting program has been completed. If the cutting program has not been completed, the process returns to step S2. If the cutting program has been completed, the process returns to step S2. Move to S8.

In step S8, it is determined whether or not there is a next cutting program. If there is no next cutting program, the program exits the loop and ends the cutting program. If there is a next cutting program, the program is executed and the process returns to step S2 to start laser cutting. Hereinafter, the same routine as described above is repeated until there is no cutting program.

According to the above-described laser cutting method, even if a defective portion occurs during cutting by the cutting program, piercing can be executed by an external input and the cutting can be restarted. Therefore, there is no possibility that a good cutting process cannot be continued after the occurrence of the processing failure and the material is wasted.

FIG. 3 shows an example in which the laser cutting method according to the present invention is applied to a laser processing apparatus having a function of avoiding interference between a work clamp and a laser processing head.

FIG. 3 (a): The laser processing head 1 approaches the work clamp 9 and the emission of laser light is stopped in an emergency. At the same time, the laser processing head 1 is raised to avoid interference with the work clamp 9. FIG. 3 (b): Laser processing head 1 is work clamp 9
When it comes to the position away from the, input the re-piercing command from the push button and re-pierce. FIG. 3 (c): Restart of the cutting process.

According to the above-described laser cutting method, laser cutting can be restarted after the laser processing head 1 avoids the work clamp 9.

[0026]

According to the first aspect of the present invention, in a laser processing apparatus controlled by an NC apparatus, even if a processing defect occurs when cutting is performed under a cutting processing program, external processing is not performed. Execute piercing by input,
Since the cutting process can be restarted, it is not possible to continue the good cutting process after the occurrence of the processing failure, so that the material is not wasted.

According to the second aspect of the present invention, in the laser processing apparatus controlled by the NC apparatus, the cutting operation interrupted by the emergency stop can be restarted by inputting a re-piercing command from the outside, so that a large number of operations can be performed. Even in the case of individual picking or the like, the cutting process in the subsequent process is not interrupted, and the operating rate of the machine is not reduced.

[Brief description of the drawings]

FIG. 1 is an operation explanatory diagram in a case where a laser cutting method according to the present invention is applied to cutting by an NC control laser processing apparatus.

FIG. 2 is a flowchart of a procedure of a laser cutting method according to the present invention.

FIG. 3 is an operation explanatory diagram when a laser cutting method according to the present invention is applied to a laser processing apparatus having a function of avoiding interference between a work clamp and a laser processing head.

[Explanation of symbols]

Reference Signs List 1 laser processing head 3 cutting path 5 defective processing section 7 planned cutting path 9 work clamp SP ₁ cutting start point SP ₂ cutting processing program interruption position (re-piercing position) W Workpiece

Claims (2)

[Claims] 1. In a laser processing apparatus controlled by an NC apparatus, the execution of the cutting program is temporarily interrupted by externally inputting a re-piercing command during the execution of the cutting program, and at the same time, the setting is performed. Calling the re-piercing processing condition, executing the re-piercing at the processing program interruption position according to the re-piercing processing condition, and then executing the cutting program after the processing program interruption position to restart the cutting processing. Characteristic laser cutting processing method. 2. A laser processing apparatus controlled by an NC apparatus, wherein a cutting process interrupted by an emergency stop is re-pierced by externally inputting a piercing command to restart the cutting process. Laser cutting processing method.