JP2004306073A - Laser beam machining device and method for laser beam machining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance efficiency of a machining work, by conducting re-machining, which is positioned to the starting position of the machining skipped due to inferior cutting by carrying out a program manipulation to a machining program. <P>SOLUTION: The starting position of the machining which is skipped due to inferior cutting, and/or a program pointer are memorized, and at the time of re-machining, the re-machining is positioned to the starting position and conducted therefrom. A laser beam machining device 1 is provided with: a skipping means 5 which, when a machining abnormality is detected during the machining, discontinues the machining and skips the part left un-machined to advance the machining to the next one; a memorizing means 4, which memorizes the starting position of the machining skipped and the pointer of the machining program; and a re-machining means 6, which positions the machining to the memorized starting position by a command of re-machining and conducts the machining skipped based on the machining program and the memorized pointer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser processing apparatus and a laser processing method, and more particularly to reprocessing performed when there is a cutting defect in laser processing.
[0002]
[Prior art]
In laser processing, when a cutting defect occurs during processing, the laser torch is slightly returned along the processed path, and the laser beam is irradiated again to perform reprocessing. Further, it is known that if reworking is not possible even if this operation is repeated, the machining is skipped and the machining is continued after piercing from the next machining start position.
[0003]
For example, Patent Document 1 discloses that processing of a defective product is interrupted and stopped, skipping to the next product processing, or reprocessing when laser processing is defective.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-296465
[Problems to be solved by the invention]
However, in order to complete the product, it is necessary to find the skipped incomplete part. If the operator finds this unfinished part, it will take an enormous amount of time for the work. In the above-mentioned patent document 1, it is shown that a laser welding failure is determined by a sensor, and the processing is returned to the determined time point and rework is attempted. However, the above document does not clearly describe what kind of program processing can be used for reprocessing in laser processing by a processing program.
[0006]
An object of the present invention is to position a machining start position of machining skipped due to cutting failure by program processing of a machining program, and to resume machining from there, thereby improving work efficiency.
[0007]
[Means for Solving the Problems]
The laser processing apparatus of the present invention is a laser processing apparatus that performs laser processing on a workpiece according to a processing program, and the laser processing method of the present invention is a laser processing method that performs laser processing on a workpiece according to a processing program. is there.
[0008]
In the first aspect of the laser machining of the present invention, in the machining program, the machining start position of the skipped machining and the pointer of the machining program are stored, positioned by the machining start position, and re-started from the machining program block skipped by the pointer. Processing is performed.
[0009]
The first aspect of the laser processing apparatus of the present invention is a skip means for interrupting the processing and skipping the rest of the processing and proceeding to the next processing when a processing abnormality is detected during processing, and skipping by this skip means. In this case, the processing start position of the skipped processing, the storage means for storing the processing program pointer, and the processing restart command are used to position at the stored processing start position, and skipped based on the processing program and the stored pointer. Reprocessing means for performing processing.
[0010]
The first aspect of the laser processing method of the present invention includes a skip step of interrupting the processing and skipping the rest of the processing and proceeding to the next processing when a processing abnormality is detected during the processing, and the skip step. When the skip is performed, the storage start position of the skipped processing and the processing program pointer are stored, and the processing restart command is used to position the stored processing start position, and based on the processing program and the stored pointer And a reworking step for performing the skipped machining.
According to the first aspect, it is possible to perform positioning at the machining location skipped by the machining start position, and by storing the machining program pointer, it is possible to identify the program block in which machining abnormality has occurred in the machining program. it can.
[0011]
According to a second aspect of the laser machining of the present invention, in a machining program, a machining program pointer is stored, and a machining start position skipped by the machining program and the pointer is obtained and positioned. Reprocessing is performed, and it can be in the form of a laser processing apparatus and a laser processing method.
[0012]
According to the second aspect, the skipped machining start position can be obtained and positioned by the pointer without storing the skipped machining start position.
Further, the third aspect of the laser processing apparatus of the present invention sequentially stores information on the processing start positions and pointers of a plurality of skipped processings in the storage means, and skips them in the stored order every time a processing restart command is received. This is a mode in which the skipped processing is performed at the start position of the processed.
According to the third aspect, when there are a plurality of skipped machining locations, the skip machining locations can be reprocessed in the order of the machining program.
[0013]
Further, the fourth aspect of the laser processing apparatus of the present invention sequentially stores information on a plurality of skipped processing start positions and pointers in the storage means, and reverses the stored order every time a processing restart command is received. In this order, the skipped machining is performed by positioning at the skipped machining start position.
[0014]
According to the fourth aspect, when there are a plurality of skipped machining locations, the skip machining location closest to the laser position stopped after skipping is reprocessed in the reverse order of the machining program. Can be reprocessed in order, and the time does not return to the initial position.
Moreover, the 5th aspect of the laser processing apparatus of this invention displays the information of the skipped process as a list or a graphic display based on the information memorize | stored in the memory | storage means.
[0015]
According to the laser processing apparatus and the laser processing method of the present invention, when a processing abnormality is detected and skipped during laser processing, a processing restart instruction is stored by storing the skipped processing start position and / or processing program pointer. By executing this, it is possible to position the skipped machining start position, and it is possible to easily rework the unmachined portion.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Regarding the laser processing apparatus and the laser processing method of the present invention, the first embodiment will be described with reference to FIGS. 1 to 6, and the second embodiment will be described with reference to FIGS.
[0017]
First, the first embodiment will be described. FIG. 1 is a schematic block diagram for explaining a first embodiment of a laser processing apparatus of the present invention.
In FIG. 1, a laser processing apparatus 1 stores a processing means 2 for performing laser processing, a processing control means 3 for controlling the processing means 2, a processing program, a start position of the skipped processing, a pointer of the skipped processing program, and the like. Storage means 4, skip means 5 for performing skip processing based on detection of abnormality in laser processing, and processing resumption means 6 for resuming skipped processing based on a processing resumption command.
[0018]
The machining control means 3 performs machining processing by controlling the machining means 2 according to the machining program. The machining program can be stored in a program memory prepared in another storage device of the storage means 4 or can be input from an external device. When the skip means 5 detects an abnormality in the laser processing, it sends a skip command to the processing control means 3, skips the processing, and executes the next processing.
[0019]
When the skip process is performed, the storage unit 4 stores the machining start position of the skipped block and the program pointer. The stored machining start position and program pointer are used for reworking the skipped machining.
[0020]
The machining restart means 6 reads the machining start position and the program pointer stored from the storage means 4 based on the input of the machining resume command, performs positioning according to the machining start position, and executes the machining program skipped by the pointer. Identify and process.
[0021]
FIG. 2 shows an example of a program for resuming machining.
In laser processing, positioning of the processing shape to the start position, piercing command, laser cutting, and laser stop are repeated. In the illustrated program example, in the block of pointers N10 to N19, positioning to the start position is performed with the pointer N10, a piercing command is issued with the pointer N11, laser cutting of the machining shape is executed from the pointer N12, and the pointer N19 Perform laser stop.
[0022]
The macro program call G code is often used at the start of cutting. G100 in the program is a G code commanded at the start of cutting, and the calling program executes a follow command, an assist gas command, a piercing command, a machining condition command for cutting, and the like. Further, G101 in the program is a G code which is instructed at the end of machining, and the calling program executes a follow-up stop command, an assist gas stop command, and the like.
[0023]
In addition, the processing program shown in FIG. 1 shows a block of pointers N20 to N29 and a block of pointers N30 to N39 in addition to the blocks of pointers N10 to N19. The G code commanded at the start of cutting of G100 is used, and the G code commanded at the end of machining of G101 is used to stop machining.
[0024]
In the machining program shown in FIG. 1, it is assumed that the machine detects a machining abnormality in each block of the pointer N13 and the pointer N33 and skips this block for use in the description of the operation of the following skip processing. Therefore, “processing interruption” described in the pointers N13 and N33 in the figure does not indicate the content of the command by the G code, but indicates the processing state.
[0025]
In the laser machining of the present invention, in this machining program, the machining start position represented by G00X-Y-, the machining start G code represented by G100, and the machining end G code represented by G101 are sandwiched. Processing is performed in units of blocks, and when a processing abnormality occurs, laser processing is resumed from the processing start position of the block in which the processing abnormality has occurred.
[0026]
Therefore, by specifying the program pointer related to the skipped processing and the processing start position indicating the head position of the block including the program pointer in the processing program, the skipped processing portion can be reprocessed.
[0027]
FIG. 3 shows a flow of processing for storing the machining start position and the program pointer. Here, the storage means includes two storage areas (a storage area A and a processing restart storage area B) for storing the machining start position read from the program memory and the program pointer. The storage area A is an area for storing all the machining start positions and program pointers included in the machining program, and the machining restart storage area B is an area for storing the machining start positions and program pointers of the skipped machining. The machining start position and the program pointer stored in the machining restart storage area B are read from the storage area A based on the machining abnormality detection and stored.
[0028]
As a preparation for storing the machining start position, an area for registering a specific G code, M code, sequence number, or the like as a machining start block is prepared. Here, G100 is registered in advance as a machining start block. The position when the control device executes the piercing command and its program pointer may be recognized as the machining start position.
[0029]
When a block indicating G100 machining start is read from the program memory during machining (step S1), the machining start position and its program pointer are temporarily stored in the storage area A. For example, the machining start position of N10 and its program pointer N11 are stored in the storage area A (steps S2, 3).
[0030]
Here, for example, when a processing abnormality occurs in processing of the pointer represented by N13, the processing control means interrupts the processing (step S4). The skip means skips the block including the pointer based on the detection of the processing abnormality, and stores the processing start position of N10 and the program pointer N11 from the storage area A into the processing restart storage area B. The storage area B for storing the processing start position and the program pointer skipped due to processing abnormality can store information of a plurality of skipped blocks (step S5).
[0031]
Steps S1 to S5 described above are repeated for each block included in the machining program. When the pointer N21 of the next machining block is read, the machining start position and the program pointer N21 are stored in the storage area A.
[0032]
In the next block, when the next machining block pointer N31 is read without detecting machining interruption, the machining start position and the program pointer N31 are stored in the storage area A. When a machining abnormality occurs at N33 and the interruption of machining is detected by skipping the block, the machining start position and the program pointer N31 are read from the storage area A and additionally stored in the machining restart storage area B.
The above processing is repeated until the end of the program, and each time machining interruption is detected, the machining start position and the program pointer at that time are additionally stored from the storage area A to the storage area B.
[0033]
FIG. 4 is a diagram for explaining the relationship among the machining program, the storage area A, and the machining restart storage area B. In FIG. 4, the reference numeral indicated by (S 1) corresponds to (Step S) described above. The machining program includes each block (block 1 to block 3) sandwiched between the G code representing the machining start position of G00X-Y-, the machining start code of G100, and the machining end code of G101. Each block executes a profile command, an assist gas command, a piercing command, a processing condition command for cutting, and the like.
[0034]
In the storage area A, a machining start position (X-, Y-) and a machining start pointer (N11, N21, N31 in FIG. 4) are stored from this machining program. Further, in the processing resumption storage area B, a block in which processing is interrupted (block 1 in FIG. 4 from among the processing start positions (X−, Y−) and processing start pointers stored in the storage area A). 3) The machining start position (X−, Y−) and the machining start pointer included in 3) are extracted and stored. In the example of FIG. 4, pointers N11 and N31 and their machining start positions (X−, Y−) are stored.
Therefore, the processing interrupted block and the processing start position can be specified from the processing start position and the pointer stored in the processing restart storage area B.
[0035]
Since the machining restart storage area B stores all machining start positions and program pointers that have been skipped due to machining errors, a list of the information can be displayed during machining and at the end of machining. Furthermore, the graphic display makes it easier to determine whether reworking is necessary. This list display can be displayed on display means (not shown in FIG. 1) provided in the laser processing apparatus.
[0036]
Next, the processing resuming operation will be described with reference to FIG. FIG. 5 is a diagram for explaining the flow of a machining resumption command based on a machining start position and a program pointer.
When the machining program is executed, if there is a machining interruption during the execution of the program, as described above, the block is skipped, the machining start position and the pointer are stored in the machining restart storage area B, and the program is terminated. To do.
[0037]
After this program is finished, the skipped portion is reprocessed by executing a processing restart command. The machining restart command is issued by the operator pressing a button on the operation panel or switching the setting on the screen.
When a machining resumption command is input, machining resumption processing is executed. FIG. 5 is a flowchart for explaining the operation of the machining restart command. First, if the machining interruption information is recorded (step S11), the machining start position and the program pointer sequentially stored from the machining resumption storage area B are read out. Whether or not the machining interruption information is recorded can be determined based on whether or not the machining start position and the program pointer are stored in the machining resumption storage area B (step S12).
[0038]
In the illustrated machining program, the program execution block pointer is set to N11 in order to resume machining at the first machining interruption point (the position of the program pointer N13 in FIG. 2) in the program to resume machining (step S13). Then, the machining start position is read out, the position of the pointer N11 is positioned at the machining start position based on the difference from the current position (step S14), and machining restart is started from this position. In this block, since the machining has been completed from the machining start position to N13, it is not necessary to irradiate the laser beam during this period. Processing is performed (step S15).
[0039]
After the reprocessing, for example, it is determined whether or not there is next processing interruption information by checking whether there is remaining information in the processing resumption storage area B (step S16).
In this example, since there is N31 as the processing interruption point information in the processing resumption storage area B, the processing resuming operation similar to step S12 to step S15 is executed for the block 3 including this N31. This operation is executed until there is no processing interruption information.
[0040]
FIG. 6 is a diagram for explaining an operation of performing re-processing using the processing resumption storage area B. In FIG. 6, the reference numeral (S 1) corresponds to the above (Step S). When the program pointer and the machining start position (X−, Y−) are stored in the machining restart storage area B (S11), the machining start position (X−, Y−) is read out (S12). (S14). Further, the program pointer is read (S12), the pointer of the program execution block is set (S13), and the processing is resumed (S15).
[0041]
In addition to the above-mentioned reworking, the operator can notice a defective machining point during actual machining and rework the part first. In addition, after positioning to the machining start position, it is also possible to skip the machining resuming operation at that portion and position to the next machining resume position. Furthermore, it is also possible to position to the machining start position in the reverse direction by reading out the stored machining interruption.
These re-machining operations can be performed by changing the machining start position stored in the machining resumption storage area B and the order in which the program pointer is read.
[0042]
Next, a second embodiment will be described. FIG. 7 is a schematic block diagram for explaining a second embodiment of the laser processing apparatus of the present invention.
The laser processing apparatus 1 shown in FIG. 7 can have substantially the same configuration as that of the first embodiment shown in FIG. 1, and processing means 2 that performs laser processing and processing control means that controls the processing means 2. 3, a storage unit 4 that stores a pointer of the skipped machining program, a skip unit 5 that performs a skip process based on detection of an abnormality in laser machining, and a machining restart unit 6 that resumes a skipped machining based on a machining restart command. Is provided.
[0043]
The difference from the first embodiment is that the storage means stores only the program pointer for rework. In the second embodiment, the storage means does not store the machining start position, and the machining restart means 6 calculates the machining start position using a program pointer, and performs positioning using the calculated machining start position.
[0044]
The machining control means 3 performs machining processing by controlling the machining means 2 according to the machining program. The machining program can be stored in a program memory prepared in another storage device of the storage means 4 or can be input from an external device. When the skip means 5 detects an abnormality in the laser processing, it sends a skip command to the processing control means 3, skips the processing, and executes the next processing.
[0045]
The storage means 4 stores the program pointer of the skipped block when the skip processing is performed. The stored machining start position and program pointer are used for reworking the skipped machining.
[0046]
The machining restart means 6 reads the program pointer stored from the storage means 4 based on the input of the machining resume command, calculates the machining start position using the program pointer, and performs positioning based on the calculated machining start position. The machining program skipped by the pointer is specified and machining is performed.
[0047]
The flow of storing the program pointer can be made almost the same as the flowchart shown in FIG. In the second embodiment, only the program pointer is stored. Therefore, it can be the same except that only the program pointer is stored in step S3 of the flowchart of FIG.
[0048]
FIG. 8 is a diagram for explaining the relationship among the machining program, the storage area A, and the machining restart storage area B in the second embodiment. In FIG. 8, the reference numeral indicated by (S 1) corresponds to the aforementioned (Step S). The machining program includes each block (block 1 to block 3) sandwiched between the G code representing the machining start position of G00X-Y-, the machining start code of G100, and the machining end code of G101. Each block executes a profile command, an assist gas command, a piercing command, a processing condition command for cutting, and the like.
[0049]
In the storage area A, machining start pointers (N11, N21, N31 in FIG. 8) from this machining program are stored. Further, in the processing restart storage area B, the processing start pointers included in the blocks where the processing is interrupted (blocks 1 and 3 in FIG. 8) are extracted from the processing start pointers stored in the storage area A. And memorized. In the example of FIG. 8, pointers N11 and N31 are stored.
Therefore, it is possible to identify the block where the processing is interrupted from the pointer stored in the processing restart storage area B.
[0050]
Next, the processing resuming operation of the second embodiment will be described with reference to FIGS. 9 and 10 are a flowchart and a schematic diagram for explaining the flow of a machining resumption command by the program pointer. In addition, the code | symbol of (S) in FIG. 10 respond | corresponds with (step S) in a flowchart.
[0051]
As in the first embodiment, when the machining program is executed, if there is a machining interruption during the execution of the program, the block is skipped, the pointer is stored in the machining restart storage area B, and the program is terminated. . After the program is finished, execute the machining restart command and rework the skipped part. The machining restart command is issued by the operator pressing a button on the operation panel or switching the setting on the screen.
[0052]
When a machining resumption command is input, processing is executed to resume machining. FIG. 9 is a flowchart for explaining the operation of the machining restart command. First, if the machining interruption information is recorded (step S21), the program pointer stored sequentially is read from the machining resumption storage area B. Whether or not the machining interruption information is recorded can be determined based on whether or not a program pointer is stored in the machining resumption storage area B (step S22).
[0053]
In the program for resuming machining, in order to resume machining at the first machining interruption point, the program pointers stored in sequence are read from the machining resumption storage area B. In FIG. 10, blocks are sequentially read from the top of the machining program in accordance with the program command (step S23), and the end point position of each block is obtained by internal calculation (step S24).
Then, the obtained end point position is compared with the machining start position of the next block, and if they match, the position is set as the machining start position, and the position is set to the machining start position based on the difference from the current position (step S26), and the machining is resumed. Is started (step S27).
[0054]
After the reworking, it is determined whether or not there is next processing interruption information by checking whether there is remaining information in the processing resumption storage area B (step S28).
In this example, since there is N31 as the processing interruption point information in the processing resumption storage area B, the same processing resumption operation is executed for the block 3 including this N31. This operation is executed until there is no processing interruption information.
[0055]
According to an embodiment of the present invention, in a laser processing apparatus that performs laser processing on a workpiece according to a processing program, by executing a processing restart command, the stored processing failure occurrence location is immediately positioned to the processing start position. Is possible. Further, by repeatedly executing the machining restart command, it is possible to immediately position to the next restart position. Furthermore, the machining resumption position can be executed retroactively, and the time for searching for an arbitrary machining resumption position can be greatly shortened, so that the work efficiency can be improved.
[0056]
【The invention's effect】
As described above, according to the present invention, by the program processing of the machining program, it is possible to position to the machining start position of the machining that has been skipped due to cutting failure, and to resume machining from there, thereby improving work efficiency. Can be planned.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram for explaining a first embodiment of a laser processing apparatus of the present invention.
FIG. 2 is an example of a program for resuming machining.
FIG. 3 is a flowchart showing the flow of processing for storing a machining start position and a program pointer in the present invention.
FIG. 4 is a diagram for explaining a relationship among a machining program, a storage area A, and a machining restart storage area B in the first embodiment of the present invention.
FIG. 5 is a flowchart for explaining the operation of a machining restart command in the present invention.
FIG. 6 is a diagram for explaining an operation of performing reworking using a work resumption storage area B in the present invention.
FIG. 7 is a schematic block diagram for explaining a second embodiment of the laser processing apparatus of the present invention.
FIG. 8 is a diagram for explaining a relationship among a machining program, a storage area A, and a machining restart storage area B in the second embodiment of the present invention.
FIG. 9 is a flowchart for explaining a flow of a machining restart command by a program pointer in the second embodiment of the present invention.
FIG. 10 is a schematic diagram for explaining a flow of a machining restart command by a program pointer in the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laser processing apparatus 2 Processing means 3 Processing control means 4 Storage means 5 Skip means 6 Processing resumption means

Claims (7)

In a laser processing apparatus that performs laser processing on a workpiece according to a processing program, when a processing abnormality is detected during processing, a skip unit that interrupts processing and skips the remaining processing and proceeds to the next processing,
When skipping by the skip means, means for storing the machining start position of the skipped machining and a machining program pointer;
A laser processing apparatus comprising: a means for positioning at the stored processing start position in response to a processing restart command, and performing processing skipped based on the processing program and the stored pointer. In a laser processing apparatus that performs laser processing on a workpiece according to a processing program, when a processing abnormality is detected during processing, a skip unit that interrupts processing and skips the remaining processing and proceeds to the next processing,
Means for storing a machining program pointer indicating a positioning command to the machining start position of the skipped machining when skipped by the skip means;
Based on the machining resumption command, the machining start position of the skipped machining is obtained based on the machining program and the pointer stored in the storage means, and is positioned at the obtained machining start position, and the machining program and the stored A laser processing apparatus comprising: means for performing processing skipped based on a pointer. A plurality of skipped processes are sequentially stored in the storage means, and each time a process resumption command is received, the skipped processes are performed by positioning at the skipped machining start position in the stored order. The laser processing apparatus as described. A plurality of skipped operations are sequentially stored in the storage means, and each time a processing resumption command is received, the skipped processing is performed by positioning at the skipped processing start position in the reverse order to the stored order. Item 3. The laser processing apparatus according to Item 1 or 2. The laser processing apparatus according to claim 1, wherein the skipped processing is displayed as a list or a graphic display based on information stored in the storage unit. In a laser processing method for performing laser processing on a workpiece according to a processing program, when a processing abnormality is detected during processing, a skip step of interrupting processing and skipping the remaining processing and proceeding to the next processing,
When skipping by the skip step, a storage step for storing the processing start position of the skipped processing and a processing program pointer;
A laser processing method comprising: a reprocessing step of positioning at the stored processing start position by a processing restart command and performing processing skipped based on the processing program and the stored pointer. In a laser processing method for performing laser processing on a workpiece according to a processing program,
When a machining error is detected during machining, the machining process is interrupted and the rest of the machining is skipped to proceed to the next machining, and
When skipping by the skip step, a storage step of storing a processing program pointer indicating a positioning command to the processing start position of the skipped processing;
Based on the machining resumption command, the machining start position of the skipped machining is obtained based on the machining program and the pointer stored in the storage means, and is positioned at the obtained machining start position, and the machining program and the stored A laser processing method comprising: a reprocessing step for performing processing skipped based on a pointer.

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