JPH05329745A - Machining condition control method for corner part - Google Patents

Abstract

PURPOSE:To facilitate maintenance of NC data without increasing an amount of NC data by inputting a machining condition matching with the angle of a corner before machining and performing machining of a corner part through execution of switching to the machining condition during machining of the corner. CONSTITUTION:A process 1-9 wherein the angle of a corner part is calculated is added to the NC data analyzing part of an ordinary NC device. Processing which is changed as a slope to a machining condition matching with the angle of a corner is effected and processing which is returned to an original machining condition from a machining condition for the corner after processing of the corner as a slope thereto is effected are added. This method improves machining precision of a corner without increasing an amount of NC data. Further, the rapid change of a machining condition is prevented from occurring and machining precision is further improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining condition control method for a corner portion of a machining machine controlled by NC.

[0002]

2. Description of the Related Art A laser processing machine system is taken as an example. Figure 7
Is a configuration diagram of a laser processing machine system. The laser processing machine system creates NC data and outputs an NC tape 3-1, an automatic programming device 3-2, reads an NC tape, a laser oscillator 3-3, and laser processing. It is composed of an NC device 3-5 for controlling the machine body 3-4.

FIG. 8 is a block diagram of an NC device. The NC device includes a parameter setting section 4-1 and an NC data analysis section 4-2.
CPU composed of processing control unit 4-3, 4-4, and NC
From the image output device 4-6 that outputs an image to the screen, the input device 4-7 that determines the key input of the NC, the auxiliary storage device 4-8 that stores data inside the NC, the main storage device 4-9, and the NC tape. It is composed of an NC tape reader 4-5 for reading data.

Next, the operation of the CPU inside the NC will be described with a focus on the flow of operation in FIG. Parameter setting section 4
-1 is the operation when parameters are input from the screen,
The input data is stored in the main storage device 5-1 and the data is displayed on the screen. The NC data analysis unit 4-2 is an operation that analyzes NC data during processing.
Read one block of NC data 5-3, analyze the data of the read block, obtain movement data and processing condition data 5-4, 5-5, and store the obtained data in the storage device 5-6 . Repeat this until the last block 5-7. The machining control unit 4-3 controls the actual machining based on the data obtained by the NC data analysis unit. The stored movement data and machining condition data are retrieved 5-8, and the machining conditions are now retrieved. Converted data to 5-9. Next, based on the movement data, the movement amount of one block is moved 5-10. This operation is repeated until the last block.

In the laser beam machine system as described above, a corner portion 6-1 between straight line commands and straight line commands, a corner portion 6-2 between straight line commands and circular arc commands, and a circular arc command as shown in FIG. When machining the corner portion 6-3 between the circular arc command and the corner portion 6-4 between the circular arc command and the straight line command,
If machining is performed under the machining conditions before the corner, the speed will be reduced at the corner due to the characteristics of the machine and the like. However, since the processing conditions other than the speed do not change, the state becomes overheated, and the tip of the corner portion melts down as shown in FIG.

In order to prevent this burn-through, the NC data commands are subdivided as shown in FIG. 12, and the machining conditions are specified at the corners so that burn-through does not occur according to the corner angles. I have to change it.

[0007]

As described above, if it is attempted to improve the machining accuracy of the corner portion, the amount of NC data increases. This increases with more corners.
In that case, if you try to modify or improve the NC data,
It's very troublesome. Further, since the amount of NC data stored in the NC is limited, if the amount of NC data is large, the number of each NC data stored will be small.

Further, in the corner portion where the machining accuracy is improved, the machining conditions are largely changed. Therefore, the machining width is not so constant as shown in FIG. Becomes worse.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to change the processing conditions of the corners in the internal processing of the NC device, and the corners can be easily processed without increasing the amount of NC data. It is an object of the present invention to obtain a method for controlling a machining condition of a corner that can perform machining.

[0010]

A method for controlling a machining condition of a corner portion according to the present invention is such that a machining condition suitable for a corner angle is input before machining, and a machining condition suitable for the corner is formed at the time of corner machining. The condition is switched to, and when the corner is completed, the original machining condition is automatically restored.

[0011]

[Operation] During machining, the angle of the previous corner is calculated, the machining conditions that match the angle are searched out from the previously entered machining conditions of the corner, and the machining conditions are changed by remembering the current machining conditions. . When the corner is finished, restore the original processing conditions that you remembered.

[0012]

【Example】

Example 1. A laser processing machine will be described as an example. First N
From the input device 4-7 of C, parameters such as "angle range", "machining condition" and "corner length" are input as shown in FIG. The "angle range" sets the range of the angle, which corner has which machining condition. The "machining condition" sets machining conditions such as speed, output, and frequency according to the angle range. The "corner length" sets the length from the corner to be changed according to the machining conditions of the corner. The data input here is stored in the main storage device 4-9 by the parameter setting unit 4-1.

When the above parameters are set, the operation during machining is as shown in FIGS. N
When analyzing NC data with the C data analysis unit 4-2,
After reading one block, 1-1, read the next one block, 1-2, and check whether the two blocks are straight lines or circular arcs 1-3, 1-4, 1-5. 2 if it was an arc
Find the tangent at the intersection of two blocks 1-6, 1-7, 1-8. Then, the angle at the intersection of two straight lines or tangents is obtained 1-9. Then, the previously read block movement command and machining condition command are analyzed to obtain movement data and machining condition data 1-10, 1-11, and the angle data of the corner is stored in a storage device 1-1.
2. Repeat this until the last block 1-13.

When the machining control section 4-3 controls machining,
First, the corner angle data obtained by the NC data analysis unit, the movement data, and the processing condition control data are retrieved from the storage device 1-14. Next, it is determined whether the previous block has performed corner control 1-15. If corner control is being performed, move up to the "corner length" under the corner machining conditions. If no corner control is performed, the machining conditions are converted based on the machining condition data 1-17. Next, it is determined whether the angle data is within the "angle range" of the parameter 1-18. If it is within the range, it is moved until the remaining distance of the block reaches the "corner length" 1-19, the "machining condition" that matches the angle is taken out, and the machining condition is converted based on the taken out data 1 -20. If the machining conditions change, move to the end of the block 1-21. If it is out of the range, move to the end point of the block without changing the machining conditions 1-21. Repeat this operation until the last block 1-22.

This operation will be applied when the straight line and the straight corner of FIG. 4 are machined. The NC data analysis unit 4-2 reads NC data of the block (1) in FIG. 4 1-1. Next, the NC data of the block of FIG. 4B is read 1-2. Since both (1) and (2) are straight lines, the angle θ between the straight line and the corner formed by the straight line is obtained 1-9. Once the angle θ is obtained, the block movement command and the machining condition command in (1) are analyzed to 1-10, 1-11, (1) and (2).
Storing the corner angle data, the block movement data of (1), and the machining condition data in the main memory 4-9 1-12
To do.

Since the NC data analysis of the block of (1) is completed, the process moves to the machining control section 4-3 to perform the machining control of (1). First, the corner angle data between (1) and (2) obtained by the NC data analysis unit, the movement data of (1), and the processing condition data are fetched from the main storage device 1-14. Since (1) is the first block and there is no corner in front, the machining conditions are set based on the machining condition data of the block of (1) 1-17. Next, it is checked whether the corner angle θ between (1) and (2) falls within the “angle range” in FIG. 3, and the “machining condition” set in that range is checked.
1-18 to retrieve the data of "corner length".
Then, based on the movement data of the block of (1), (1)
Move until the remaining distance of the movement is equal to the "corner length" 1-19. Then, the movement of the part <A> in FIG. 4 is completed. When the remaining distance becomes the same as the "corner length", the machining condition is changed to the "machining condition" that matches the previously extracted angle θ 1-20, and the remaining distance is moved 1-21. At this point, the movement of the portion <a> in FIG. 4 is completed.

The block of (2) is the same as that of (1),
The NC data analysis unit first analyzes the NC data. Then, in the machining control unit, the data obtained by the NC data analysis unit is taken out, and since it is after the corners 1-14 and (1) and (2), move to the "corner length" under the machining conditions of the corner. , After changing to the "corner length", change the machining conditions based on the machining condition data of the block of (2) 1-16.
At this point, the movement of the portion <C> in FIG. 4 is completed. Since there is no corner at the end of the block of (2), the block is moved under the same machining conditions 1-21. At this point, the movement of the part <D> in FIG. 4 is completed.

FIG. 5 shows changes in the processing conditions when the straight and straight corners of FIG. 4 are processed with respect to the output of the laser oscillator.

Example 2. First, from the NC input device, see FIG.
Enter the "slope length" such as. “Slope length” sets the length of slope when the processing conditions change. The data input here is stored in the main storage device by the parameter setting unit.

When the above parameters are set,
Slope 1-20 at the corner where the machining conditions automatically change to match the corner angle, and 1-16 after the corner where the machining conditions change from the corner machining conditions to the block machining conditions. The sloped distance is the "slope length" parameter.

When this operation is applied to the machining shown in FIG. 4 of the first embodiment, the "slope length" is shown from the beginning of the movement of <a> in FIG.
Slope in minutes, and perform "slope length" in minutes from the end of the movement of <C> in Fig. 4. Then, the change in the output of FIG. 5 becomes as shown in FIG. Other processing conditions change similarly. The reason is that the time required to move the "slope length" is obtained in advance, and the machining conditions are gradually changed so that all the changes in the machining conditions are completed at that time. By doing so, the corner machining accuracy is improved.

[0022]

As described above, according to the present invention, it is not necessary to increase the amount of NC data in order to improve the corner accuracy, maintenance of NC data is facilitated, and N
The number of NC data stored in C does not decrease.

[Brief description of drawings]

FIG. 1 is a flowchart showing a flow of operations for explaining an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of operations for explaining an embodiment of the present invention.

FIG. 3 is a diagram showing parameters required in an embodiment of the present invention.

FIG. 4 is a diagram for explaining a corner to be machined in an embodiment of the present invention.

FIG. 5 is a diagram showing changes in processing conditions when processing is performed in an example of the present invention.

FIG. 6 is a diagram showing changes in processing conditions when processing is performed in another example of the present invention.

FIG. 7 is a configuration diagram of a conventional laser processing machine system.

FIG. 8 is a configuration diagram of a conventional NC device.

FIG. 9 is a flowchart showing a flow of conventional processing control operations.

FIG. 10 is a diagram showing a corner that performs corner control.

FIG. 11 is a diagram showing the burn-through of a corner.

FIG. 12 is a diagram showing a conventional method for improving corner accuracy.

FIG. 13 is a diagram showing processing of a processing condition conversion unit.

[Explanation of symbols]

 4-1 Parameter setting part 4-2 NC data analysis part 4-3 Processing control part 4-4 CPU 4-5 NC tape reader 4-6 Image output device 4-7 Input device 4-8 Auxiliary storage device 4-9 Main Storage device

Claims (1)

[Claims] 1. A numerical control device (hereinafter, referred to as NC) analyzes NC data, and in various processing machines for processing, a processing condition suitable for a corner angle is input before processing, and the corner is input. A machining condition control method for a corner portion, characterized in that the machining is performed on the corner portion by switching to the machining condition during machining.