JPH11165239A - Numerical control data editing device and editing method of numerical control data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the collision and interference of a jig and a machining tool and edit NC data so as to ensure a mounting position of the jig securely. SOLUTION: An NC data selection part 4a specifies NC data for workpiece from among NC data which is prepared by CAD/CAM.EWS3 and is stored in an NC data storage part 7a. A mounting jig specification setting part 4b specifies jig shape registered in a jig shape memory part 7b and a mounting position and a direction of rotation of the jig. A machining tool invasion non- allowable zone calculation part 12a calculates a machining tool invasion non- allowable zone based on the contents of setting of the mounting jig and draws it in a display part 8. An interference judging part 12b analyzes NC data to judge whether a machining tool invades the machining tool invasion non- allowable zone or not, generates a detour locus in a detour locus generation insertion part 12c when the machining tool invades the zone, and inserts the detour locus in NC data. NC data is transmitted to NC machine tool 2 together with such detour locus data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control data editing apparatus and a numerical control data editing method, and more particularly, to a numerical control (Numerical Control) machine tool such as a milling machine. The present invention relates to an NC data editing apparatus for editing NC data and an NC data editing method.

[0002]

2. Description of the Related Art Conventionally, in NC machine tools such as a milling machine for processing a workpiece by NC data,
A workpiece is fixed to a machine pallet or a table with a mounting jig such as a machine vise or a plane clamp, and a workpiece such as an end mill is lowered from above to perform a cutting process on the workpiece.

In this type of NC machine tool, a mechanical pallet and a workpiece have a positional relationship as shown in FIG. That is, in the NC machine tool, a workpiece 52 placed on a flat machine pallet 51 is fixed by a pair of plane clamps 53a and 53b as mounting jigs.

[0004] NC data for processing the workpiece 52 must be determined so that the plane clamps 53a and 53b and the processing tool do not collide with each other and interfere with each other. That is, the part programmer determines in advance the dimensions and the like of the plane clamps 53a and 53b and their mounting positions, and then creates desired NC data so that the plane clamp 53 and the processing tool do not collide with each other. Conventionally, the mounting data (dimensions and the like of the plane clamps 53a and 53b and their mounting positions) are accurately described in the machining instruction sheet so that the contents are transmitted to the operator of the machine tool. The workpiece 52 is fixed on the mechanical pallet 51 on the basis of.

[0005]

However, in the above-mentioned prior art, since the part programmer determines the dimensions and the like and the mounting position of the mounting jig, the part programmer requires abundant processing knowledge. In other words, in order to avoid collision between a processing tool such as an end mill and a mounting jig for fixing a workpiece, a skilled technician who is familiar with machining must be used as a part programmer. The use of a poorly skilled unskilled person as a part programmer leads to a significant decrease in production efficiency, and there is a problem in that the number of personnel to be employed in the part programmer job is limited.

[0006] Conventionally, the attachment data is stored in an NC.
The work piece 52 is determined when the program is created.
NC data can no longer be changed at the time of attachment to the machine pallet 51, and as a result, when it is desired to change the processing from one machine tool to another machine tool and process the workpiece 52, or If the processing shape of the workpiece 52 becomes different from that assumed at the time of the initial NC program creation by the processing in the pre-processing step, it may be impossible to secure the mounting position of the mounting jig. There was a problem. That is, as shown in FIG. 14, for example, the shape of the workpiece 52 is changed in the pre-processing step,
When the recess 52a is formed in the plane clamp 53a, the workpiece 52 can be attached to one plane clamp 53a, but the workpiece 52 cannot be attached to the other plane clamp 53b. In such a case, there is a problem that the NC data must be created again.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and eliminates the need to consider attachment data when creating an NC program and avoids collision interference between a jig and a processing tool. It is an object of the present invention to provide an NC data editing apparatus and an NC data editing method capable of editing NC data so that a mounting position of a jig can be reliably secured.

[0008]

According to a first aspect of the present invention, there is provided a storage means for storing numerical control data, wherein the numerical control data is prepared for a workpiece from the numerical control data. Selecting means for selecting specific numerical control data;
A numerical control data editing apparatus comprising: input means for inputting jig data of a jig for fixing the workpiece; and determining whether or not the specific numerical control data and the jig data interfere with each other. Means, a detour means for generating detour locus data of the processing tool with respect to the jig data when the specific numerical control data and the jig data are determined to interfere with each other, and detour locus data by the detour means. And a means for inserting the detour trajectory data into the specific numerical control data when is generated.

According to a seventh aspect of the present invention, there is provided a selecting step of selecting, from the numerical control data stored in the storage means, specific numerical control data created for a workpiece, fixing the workpiece. An input step of inputting jig data of the jig to be performed.
Determine whether or not the specific numerical control data and the jig data interfere with each other, and when the specific numerical control data and the jig data interfere with each other, generate detour trajectory data of the processing tool with respect to the jig data. The detour data is inserted into the specific numerical control data.

The other features of the present invention will become apparent from the following description of embodiments of the present invention.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an NC data editing apparatus according to the present invention. The NC data editing apparatus 1 includes an NC machine tool 2 such as a milling machine controlled by NC data and a machine tool. CAD / CAM / EWS (Computer Aided Design) for creating graphic data of workpieces
/ Computer Aided Manufacturing ・ Engineering workst
ation) 3.

The NC data editing apparatus 1 includes an input unit 4 for inputting jig data and the like of a mounting jig, a ROM 5 storing an arithmetic program for a detour movement command generation process described later, and the like.
RAM6 used as a work area, CAD / C
A storage device 7 for storing NC data and the like created by the AM / EWS 3, a display unit 8 for displaying jig data and graphic data of a workpiece, and a display unit 8 for displaying jig data and graphic data of a workpiece. An I / F is connected between an output unit 9 that performs print output, a first communication I / F 10 that controls an interface (I / F) operation between the NC machine tool 2, and a CAD / CAM / EWS 3.
It has a first communication I / F 11 for controlling the F operation and a CPU 12 for controlling the entire apparatus. The above-mentioned components are connected to each other via a system bus 13.

FIG. 2 is a processing block diagram showing a signal flow of the NC data editing apparatus 1.

The storage device 7 has a CAD / CAM / EWS3
Data storage unit 7 for storing the NC data created in
a and a jig shape storage unit 7b in which the jig shape and the like are registered in advance.

An input unit 4 is provided with an N for processing a workpiece.
An NC data selection unit 4a for selecting C data and a mounting jig specification setting unit 4b for setting the jig shape and mounting position of the mounting jig and the rotation direction of the jig are provided.

The CPU 12 calculates a region in which a processing tool such as an end mill is to be prevented from entering, that is, a processing tool inaccessible region calculation unit 1 for calculating a processing tool inaccessible region in which there is a risk of collision interference.
2a and an interference determination unit 1 that determines whether or not a processing tool enters the processing tool inaccessible area based on the setting specifications of the mounting jig.
2b, and a detour trajectory generating / inserting part 12c for generating a detour trajectory and inserting the detour trajectory data (NC data) when the mounting jig and the processing tool are determined to interfere with each other by the interference determining part 12b. doing.

Thus, in FIG. 2, CAD / CAM
The NC data created by the EWS 3 is stored in the NC data storage unit 7a, and then created by the NC data selection unit 4a for the workpiece from the NC data stored in the NC data storage unit 7a. Select and specify NC data. Next, the mounting jig specification setting unit 4b specifies the jig shape with reference to the jig code registered in advance in the jig shape storage unit 7b, and further specifies the jig mounting position and the rotation direction of the jig. I do. In this case, if it is desired to generate and insert a detour movement command that avoids interference for all positioning movements, instead of inputting the jig shape, input the protrusion height from the workpiece as a representative value. Is also good.

The specification of the mounting jig can be set by the mounting jig without fail in consideration of the current shape of the workpiece from the NC data stored in the NC data storage unit 7a. It is set to such a position. That is, if the workpiece has already been partially processed in the pre-processing step or the like, the specifications of the mounting jig are changed, and the mounting jig specifications are set so that the mounting jig can always attach the workpiece. .

Next, the processing tool inaccessible area calculation unit 12a calculates each movement command unit based on the setting contents (the jig shape, the mounting position of the jig, and the rotation direction) set by the mounting jig specification setting unit 4b. The processing tool inaccessible area is calculated every time and drawn on the display unit 8. Next, in the interference determination unit 12b, NC
The NC data selected by the data selection unit 4a is analyzed to determine whether or not the processing tool enters the processing tool inaccessible area. When it is determined that the processing tool enters the processing tool inaccessible area, that is, when it is determined that collision interference occurs, the detour trajectory generation / insertion unit 12c generates a detour trajectory and sends the detour trajectory command to the NC data. Insert The NC data subjected to such processing is transmitted to the first communication I / F.
The data is transmitted to the NC machine tool 2 via the PC 10 or transmitted to the NC machine tool 2 via a storage medium such as a flexible disk.

FIG. 3 is a flow chart showing a setting procedure of the mounting jig specification. This program is executed by the mounting jig specification setting section 4b.

In step S1, it is determined whether the input method is the individual jig input method. And the answer is affirmative (Ye
In the case of s), the jig shape is selected with reference to the jig code table stored in the jig shape storage unit 7b.

FIG. 4 shows an example of a jig code table when a plane clamp is used as a mounting jig. The jig code table has the dimensions W, L, H, and H of the plane clamp shown in FIG. A is coded and stored in the jig shape storage unit 7b. That is, a plan view (FIG. 5A) and a front view (FIG. 5A) of the plane clamp shown in FIG.
As is apparent from (b), W, L, and H indicate the width, length, and height of the jig, respectively, P0 is a mounting point of the plane clamp, and A is a holding unit that the plane clamp suppresses the workpiece. Are shown.

Next, in step S3, the attachment position and the rotation angle of the attachment jig are designated, and the process is terminated.

FIG. 6 shows the mounting position and the rotation angle of the mounting jig when PC1 is selected as the jig code.
That is, in the present embodiment, the plane clamp 15a
The center coordinates (X, Y, Z) of the mounting point P0a are (0, 1)
00.0,0) and the rotation angle is set to 0 °. The center coordinates (X, Y, Z) of the mounting point P0b of the plane clamp 15b are (100.0, 50.0,
0), and the mounting direction of the plane clamp 15b differs from the plane clamp 15a by 180 °.
The rotation angle is set to 180 °.

On the other hand, if it is determined in step S1 that the input method is not the individual jig selection method, it is determined that the input method is the jig protrusion height input method, and the flow advances to step S4 to set the jig code. The corresponding height H is searched for in the jig code table, selected and input (for example, “10” when the jig code is PC1), and the process is terminated.

When the mounting position and the rotation angle of the mounting jig are determined in this way, the processing tool inaccessible area calculation unit 12a calculates the processing tool inaccessible area as described above.

FIG. 7 is an explanatory diagram showing the calculation of the work tool inaccessible area when the jig code is PC1.

That is, when the jig code is PC1,
Since the width W is “15” and the center coordinate of the attachment point P0a on the Y axis is “100.0”, 92.5 on the Y axis.
The processing tool is a plain clamp 15a within the range of ~ 107.5.
There is a risk of collision. Also, the length L is “50”,
Since the holding portion A is “20”, the work 1
4 with respect to one end face 16 of the workpiece clamp 4 within the range of "-30.0" and "20.0", respectively.
a. Therefore, for the plane clamp 15a, the region 15'a is an inviolable region of the processing tool.

Similarly, since the center coordinate of the attachment point P0b on the Y axis is "50.0", 42.5-57.
5, the processing tool may collide with the plane clamp 15b. On the X-axis, the processing tool may be in the range of "80.0" and "130.0" with respect to the end face 16 respectively. There is a risk of collision. Therefore,
With respect to the plane clamp 15b, the region 15'b is a region where the processing tool cannot enter.

As described above, the processing tool inaccessible area 15'a,
The boundary coordinate values of 15'b are the plane clamps 15a, 1
It is easily calculated from the center coordinates (X, Y, Z) of 5b and the jig dimensions.

Next, the processing contents of the interference determination section 12b will be described.

FIG. 8 is a flowchart showing the procedure of the interference determination process executed by the interference determination section 12b.

In step S11, an NC command is taken out in units of one command from the NC data temporarily stored in the RAM 6 and prepared for machining the workpiece, and the following step S11 is executed.
At 12, it is determined whether or not the extracted NC command is a movement command. If the answer is negative (No), step S
On the other hand, if the answer is affirmative (Yes), it is determined whether the input method is the individual jig input method. When the answer is negative (No), it is determined that the input method is the jig protrusion height input method, and the process proceeds to step S16. When the answer is affirmative (Yes), the process proceeds to step S14.
Calculate the processing tool passage area.

FIG. 9 is an explanatory view showing a processing tool passage area. In the case where the NC command extracted by the NC data commands the movement trajectory 17, the diameter of the processing tool is D.
A region 18 indicated by hatching is a processing tool passage region.

As described above, the processing tool passage area 18 is calculated by a simple geometric calculation such as performing offset processing on the movement trajectory 17 by a radius D / 2 of the processing tool on the drawing.

Next, in step S15, it is determined on the drawing whether or not the processing tool passage area 18 and the processing tool inaccessible areas 15a and 15b interfere with each other.

That is, as shown in FIG. 10, the processing tool passage area 1 calculated based on the movement trajectories 17a and 17b
8a, 18b and the processing tool inaccessible area 15 'determined based on the mounting specifications of the plane clamps 15a, 15b.
a and 15'b are superimposed on the drawing. And one processing tool passage area 18a is a processing tool inaccessible area 15'a
It is determined that there is graphic interference because of the overlapped portion, and the other processing tool passage area 18b is the processing tool inaccessible area 15'b
It is determined that there is no graphic interference because there is no overlapping portion.

If it is not determined in step S15 that there is graphic interference, the process proceeds to step S17, while the process proceeds to step S17.
If it is determined in step 15 that there is graphic interference, step S16
To generate a detour trajectory, and generate the detour trajectory by N
Insert into C data.

That is, as shown in FIG. 11, when the NC data read from the storage device 7 is the movement trajectory 17a, it interferes with the processing tool inaccessible area 15'a. The detour trajectory data is generated so that the arrow 20 becomes the arrow 21, that is, for example, so that the processing tool detours the movement trajectory 17 a by 30 mm in the Z-axis direction. Then, as shown in FIG. The detour trajectory data is inserted into the NC data. This can prevent the jig and the processing tool from colliding with each other.

Next, in step S17, it is determined whether or not all NC commands have been commanded. If the answer is negative (No), the process returns to step S11. If the answer is affirmative (Yes), the process proceeds. To end.

As described above, according to the present embodiment, the NC data is edited by changing the original NC data at the time of the actual processing, so that the jig and the processing tool collide and interfere with each other. Can be avoided, and the mounting position of the jig can be reliably ensured.

The present invention is not limited to the above embodiment. In the above embodiment, the movement command is defined by specifying the increment value. However, the movement command may be specified by specifying the absolute coordinate value. Needless to say, it is good.

[0044]

As described above in detail, according to the NC data editing apparatus and the NC data editing method of the present invention, the NC data can be set according to the mounting information of the jig and the shape of the workpiece at the time of actual processing. Since the data can be changed, it is possible to prevent the jig and the processing tool from colliding and interfering with each other, and it is possible to reliably secure the mounting position of the jig.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an NC data editing apparatus according to the present invention.

FIG. 2 is a processing block diagram showing a signal flow of the NC data editing device.

FIG. 3 is a flowchart illustrating a processing procedure of a mounting jig specification setting process.

FIG. 4 is a processing information table.

FIG. 5 is a plan view and a front view of a plane clamp as a mounting jig.

FIG. 6 is an explanatory diagram for explaining setting of a mounting position and a rotation angle of a mounting jig.

FIG. 7 is an explanatory diagram for explaining calculation of a processing tool inaccessible region.

FIG. 8 is a flowchart illustrating a procedure of an interference determination process.

FIG. 9 is a plan view showing a processing tool passage area which is a movement locus of the processing tool.

FIG. 10 is a plan view showing a positional relationship between a movement locus of a processing tool and a mounting jig.

FIG. 11 is an explanatory diagram for explaining generation of a detour trajectory.

FIG. 12 is an explanatory diagram for describing insertion of a detour trajectory into NC data.

FIG. 13 is a perspective view showing a positional relationship between a conventional mechanical pallet and a workpiece.

FIG. 14 is a perspective view for explaining a conventional problem.

[Explanation of symbols]

 Reference Signs List 4 input unit (input means) 7 storage device (storage means) 12a processing tool inaccessible area calculation unit (calculation means) 12b interference determination unit (judgment means) 12c detour trajectory generation insertion unit (detour means, insertion means)

Claims (12)

[Claims] 1. A storage means for storing numerical control data, a selecting means for selecting specific numerical control data created for a workpiece from the numerical control data, and a fixing means for fixing the workpiece. A numerical control data editing apparatus comprising: input means for inputting jig data of a jig; judging means for judging whether or not the specific numerical control data and the jig data interfere with each other; Detour means for generating detour trajectory data of the processing tool with respect to the jig data when it is determined that the specific numerical control data and the jig data interfere with each other; and when the detour means generates detour trajectory data, the detour means A numerical control data editing device, comprising: insertion means for inserting trajectory data into the specific numerical control data. 2. The method according to claim 1, wherein the determining unit calculates a processing tool inaccessible area that prevents the processing tool from entering based on the jig data, based on a calculation result of the calculating unit and the specific numerical control data. 2. The numerical control data editing apparatus according to claim 1, further comprising a comparison unit configured to compare obtained movement locus data of the processing tool. 3. The numerical control data according to claim 1, wherein the jig data includes at least shape data of the jig and mounting position information of the jig. Editing device. 4. A storage means for storing numerical control data, a selecting means for selecting specific numerical control data created for a workpiece from the numerical control data, and a fixing means for fixing the workpiece. In a numerical control data editing apparatus comprising: input means for inputting jig data of a tool, a detour means for generating detour locus data of a processing tool with respect to the jig data, and detour locus data generated by the detour means Insertion means for inserting the detour trajectory data into the specific numerical control data when necessary. 5. The numerical control data editing apparatus according to claim 4, wherein said jig data is a height of protrusion from said workpiece. 6. The numerical control according to claim 1, further comprising changing means for changing the jig data according to a current shape of the workpiece. Data editing device. 7. A selecting step of selecting specific numerical control data created for a workpiece from numerical control data stored in a storage means, and selecting jig data of a jig for fixing the workpiece. In the editing method of numerical control data including an input step of inputting, it is determined whether or not the specific numerical control data and the jig data interfere with each other, and when the specific numerical control data and the jig data interfere with each other, Is a method of editing numerical control data, wherein detour trajectory data of a processing tool with respect to jig data is generated and the detour data is inserted into the specific numerical control data. 8. A processing tool inaccessible area for preventing the intrusion of the processing tool is calculated based on the jig data, and the calculation result and movement locus data of the processing tool obtained based on the specific numerical control data are calculated. 8. The method for editing numerical control data according to claim 7, wherein 9. The numerical control data according to claim 6, wherein the jig data includes at least shape data of the jig and mounting position information of the jig. How to edit. 10. A selection step of selecting specific numerical control data created for a workpiece from numerical control data stored in a storage means, and selecting jig data of a jig for fixing the workpiece. An inputting step of inputting the numerical control data, comprising: generating detour trajectory data of a processing tool with respect to the jig data, and inserting the detour data into the specific numerical control data. How to edit the data. 11. The method according to claim 10, wherein the jig data is a protruding height from the workpiece. 12. The method of editing numerical control data according to claim 7, wherein said jig data is changed according to a current shape of said workpiece.