JPH0433008A - Cad/cam device - Google Patents

Abstract

PURPOSE:To make an operator easily know the existence of overlapped paths by providing an overlap detecting means and a work path display means, automatically checking the overlap of the generated paths, and displaying it on a screen so as to whether the paths are overlapped or not. CONSTITUTION:Concerning the work path generated from a graphic data by a work path generating means 8, a direction vector generating means 9 generates a direction vector, and an overlap detecting means 10 checks the change of the direction vector. When the direction is changed at 90 deg., for example, it is decided that the work path is not overlapped, and when the direction is changed at 180 deg., for example, it is decided that the path is overlapped. Based on the decided result of the overlap detecting means 10, a work path display means 5 displays the overlapped work path and the not-overlapped work path so as to identify them by changing the color or the luminance, for example. Thus, the operator can know it only by observing the picture display of the work path whether the overlapped path exists or not.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a CAD/CAM device, and more specifically, to a CAD/CAM device that generates a machining path from graphic data.
Regarding equipment.

[Conventional technology] An example of a conventional CAD/CAM device is shown in FIG.

In this CAD/CAM device 51, a human power device 3, a storage device 4, a display device 5, and an output device 6 are connected to a CPU 52.

The CPU 52 includes a central processing section 57 and a bus generation section 8.

FIG. 12 is a flow diagram showing the operation of the CAD/CAM device 51.

When graphic data is input from the input device 3 and stored in the storage device 4, and an instruction to start generating a path (processing path) is input (step S1), the path generation unit 8 generates a path from the graphic data ( Step S2).

The central processing unit 57 displays the generated path in white on the screen of the display device 5 (step 35).

When all the paths are generated from the graphic data by repeating steps S2 and S5, the process ends (step S7).

FIG. 13 shows an example of generated paths, with paths PL, P
2. P3. P4. P5 are generated in this order. Note that in the figure, black dots represent the starting points of the paths, and white dots represent the ending points of the paths.

FIG. 14 is a screen display example of paths P1 to P5 shown in FIG. 13.

[Problems to be Solved by the Invention] In passes P1 to P5 shown in FIG. 13, lx P4 and pass P5 overlap, but the presence of such overlapping passes will damage the machined surface. There is a danger.

However, with the screen display of paths as shown in FIG. 14, it is not possible to identify whether or not the paths overlap, so there is a problem that the operator may overlook the existence of overlapping paths.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a CAD/CAM device that can automatically detect the existence of duplicate paths and display the same to an operator in an identifiable manner.

[Means for Solving the Problems] A CAD/CAM device of the present invention includes a machining path generating means for generating a machining path from graphic data, a direction vector generating means for generating a direction vector for the generated machining path, and a direction vector generating means for generating a direction vector for the generated machining path. Duplication detection means for determining whether or not machining paths overlap based on changes in vectors; and machining path display means for displaying machining paths on a screen in a form that allows identification of overlapping and non-overlapping machining paths. The structural feature is that it is equipped with the following.

[Operation] In the CA D/CAM device of the present invention, the direction vector generation means generates a direction vector for the machining path generated from the graphic data by the machining path generation means. and an overlap detection means checks for a change in the direction vector,
For example, if the directions change by 90 degrees, it is determined that the machining paths do not overlap, and if the directions change, for example, by 180 degrees, it is determined that the machining paths overlap.

The machining route display means displays the machining route on the screen, and displays overlapping machining routes and non-overlapping machining routes in different colors or brightnesses, for example, based on the determination result of the duplication detection means.

Therefore, the operator can now know whether or not there are duplicate paths simply by looking at the screen display of the machining path.

[Example] Hereinafter, the present invention will be described in more detail based on the example shown in the drawings. Note that this invention is not limited to this.

Figure 1 shows a CAD/CAM system according to an embodiment of this invention!
It is a block diagram showing Fl.

The CPU 2 includes an input device 3, a storage device 4, and a display device 5.
and an output device 6 are connected.

The CPU 2 includes a central processing unit 7 that controls the overall operation, a path generation unit 8 that generates paths one block at a time based on the graphic data, and a unit tangent vector at the start and end points of the generated path that is calculated as a direction vector. The direction vector calculation unit 9 compares the direction vector at the start point of the path of a certain block with the direction vector at the end point of the path of the block before that block, and determines that the change in direction is approximately 18.
It includes an overlap detection unit 10 that determines that both buses overlap when the angle is 0°, and determines that they do not overlap at other times.

The input device 3 is used to input graphic data and various instructions.

The storage device 4 stores input graphic data.

It stores generated paths, direction vectors, one-duplication determination results, programs, and the like.

The display device 5 displays graphic data, paths, etc. on the screen.

The output device 6 outputs the generated path to the outside for use in actual processing.

FIG. 2 is a flow diagram showing the operation of the CAD/CAM device W1.

When the operator inputs an instruction to start path generation (
Step S1), the path generation section 8 generates a path based on the graphic data.Step 32), the direction vector calculation section 9
calculates a direction vector for the generated path (step S3).

As a result, for example, as shown in FIG. 3, a path P1 for the first block is generated, and a unit tangent vector A1 at the starting point of the path P1 and a unit tangent vector B1 at the end point are calculated as direction vectors. Ru.

The overlap detection unit 10 compares the direction vector for the path of the block preceding the block of the path generated in step S2 with the direction vector generated in step S3, and determines whether or not both buses overlap. However, since the block before the block of path P1 in Fig. 3 does not exist,
It is determined that there is no overlap (step S4).

If it is determined that there is no overlap, the corresponding path is displayed in white (step S5).

FIG. 4 is an example of a screen display of the path P1.

If the next path can be generated from the graphic data, the process returns to step S2 (step S7).

In the second step S2 and step S3, for example, as shown in FIG. 5, the path P2 and the unit tangent vector A2. B2 is generated.

The overlap detection unit 10 compares the unit tangent vector A2 at the starting point of the path P2 with the unit tangent vector B1 at the end point of the path P1 of the previous block, and checks for a change in direction.

The specific method for this check is to subtract each element of the unit tangent vector A2 and unit tangent vector B1, square them, add them, compare with a predetermined tolerance value ε, and if it is smaller than the tolerance value ε, the direction will change. is approximately 180 degrees, and it is determined that they overlap, and if it is larger than the tolerance value ε, it is determined that they do not overlap.

In the example of FIG. 5, it is determined that path P2 and path P1 do not overlap (step S4).

Therefore, as shown in FIG. 6, the path P1 and the path P2 are displayed in white on the screen (step S5).

By repeating the above operations, pass P4 is reached as shown in FIG.
When the paths P1 to P4 are generated as shown in FIG.
is displayed in white.

Next, as shown in FIG. 9, when a path P5 is generated and the unit tangent vector A5 at its starting point is compared with the unit tangent vector B4 at the end point of the path P4 of the previous block, the direction change is approximately 180. ”, the duplication detection unit 10 determines that both paths P4 and P5 overlap (step S4).

Then, the central processing unit 7 displays the path P4 and the path P5 in red (step S6).

Therefore, the screen is displayed as shown in FIG. 10, and the operator can easily know that there are duplicate paths.

Note that in the above embodiment, a stand-alone CAD/C
Although AM device 1 has been explained, CAD/
The present invention can also be applied to a case where functions equivalent to those of a CAM device are built in, and this is also included in the scope of the present invention.

[Effects of the Invention] According to the CAD/CAM device of the present invention, duplication of generated paths is automatically checked.

It displays on the screen clearly whether there are duplicates or not.
The operator can easily know the existence of duplicate paths. Therefore, it is possible to prevent damage to the workpiece due to machining with the overlapped passes existing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the CAD/CAM device of the present invention, FIG. 2 is a flow diagram of the operation of the device shown in FIG. 1, and FIG. 3 is a conceptual diagram of generated paths and direction vectors. Figure 4 is an example of the screen display of the path in Figure 3, Figure 5 is a conceptual diagram of the generated path and direction hector, Figure 6 is an example of the screen display of the path in Figure 5, Figure 7 is a conceptual diagram of the generated path and direction vector, FIG. 8 is an example of screen display of the path of FIG. 7, FIG. 9 is an example of the generated path and direction vector, and FIG. 11 is a block diagram of an example of a conventional CAD/CAM device, FIG. 12 is a flowchart of the operation of the conventional device shown in FIG. 11, and FIG. 13 is a diagram showing the generated path. The conceptual diagram, Figure 14 is the first
FIG. 4 is an exemplary diagram of a screen display of the path shown in FIG. 3; In the figure, (1) (51) is a CAD/CAM device, (
2) (52) is the CPU, (3) is the input device, (4) is the storage device, (5) is the display device, (6) is the output device, (7)
(57) is the central processing unit, (8) is the bus generation unit, (9) is the direction vector calculation unit, (10) is the overlap detection unit, (Pl)
~(B5) is a path, and (Al) ~(B5) is a direction vector. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. Machining path generation means that generates a machining path from graphic data, direction vector generation means that generates a direction vector for the generated machining path, and determines whether or not the machining paths overlap based on changes in the direction vectors. What is claimed is: 1. A CAD/CAM device comprising: a duplication detection means for detecting overlapping; and a machining path display means for displaying a machining path on a screen in a form that allows identification of overlapping and non-overlapping machining paths.