JPH0330002A - Editing method for path data - Google Patents

Abstract

PURPOSE:To automatically correct detected incorrect data by operating an angle variation, a tolerance and a radius of curvature of a path in each constitution point from path data. CONSTITUTION:A digitizer 1 makes point group data of an object 2, outputs obtained data to a data medium 3 and sends it to an arithmetic unit 4. In the case by an automatic detecting function for taking notice of an angle variation, a tolerance and a radius of curvature, incorrect data corresponding to one of them is detected, the unit 4 corrects automatically the incorrect data by a mode (deletion, movement, etc., of incorrect point) designated in advance. In such a way, data edited with a high quality can be obtained automatically. Subsequently, three-dimensional shape working tool path data obtained in such a way is sent to machine tool 6 through a medium 5 and an article is worked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Fields of Industrial Application] The present invention is intended to prevent fraud in tool path data or digitized data for three-dimensional shape machining in CAD/CAM systems, automatic programming devices, NC devices, digitizers, scanning machines, etc. This invention relates to an editing method for detecting and modifying data.

For example, when editing tool path data, conventionally, the tool path data is given to a plotter or graphic display, and a human being visually observes the tool path displayed by the plotter or graphic display to prevent irregularities such as tool digging during machining. It was checked to see if there were any illegal points in the tool path, and if any points were found, the data had to be corrected manually. The same goes for editing digitized data; a surface is created from the digitized data, displayed on a graphic display, etc., and visually checked by a human, and if there are any irregularities that lack smoothness, the data is corrected manually. was.

Problems to be Solved by the Invention Since the output of a plotter or graphic display is only a two-dimensional representation, it is impossible to perform a complete check by simply displaying the three-dimensional tool path and creation surface from one direction. It is possible.

Therefore, it is necessary to change the display direction and repeat checking from various directions, but in particular, it is necessary to visually and manually correct large amounts of path data such as tool path data for 3D shape machining or digitization data of 3D shapes. When creating the W4 collection, there was a problem in that it took too much time.

An object of the present invention is to provide a route data editing method that can automatically detect incorrect points and automatically correct them without requiring human visual inspection or manual correction.

Means for Solving the Problems> The path data editing method according to the present invention can be used to edit tool path data for three-dimensional shape machining, three-dimensional shape digitization data, etc.
The angle change of the path based on the data of the constituent points of the 3D path,
By calculating at least one of tolerance and radius of curvature,! ! The present invention is characterized in that an invalid point on the road is automatically detected, and the data of the detected invalid point is automatically corrected by performing an operation of at least one of deleting and moving constituent points.

<Function> When machining a 3D shape according to a tool path, the tool bites into the tool, or at irregular points where the 3D surface created from digitized data lacks smoothness, the angle change in the path is extremely large. or the tolerance is extremely large, or the radius of curvature is extremely small.

Therefore, by calculating the angular change, tolerance, or radius of curvature of the route at each constituent point from the route data, it is possible to automatically detect invalid points (complaint data). If an incorrect point is detected, the data is automatically corrected by deleting or moving the point.

<Example> An example of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a block configuration of a system according to an embodiment of the present invention. In the figure, digitizer 1 creates point cloud data of object 2,
The obtained point group data is output to a data medium 3 such as a floppy disk, and sent to the arithmetic unit N4. The arithmetic unit 4 performs various processes such as editing digitized data from point cloud data, creating a surface, calculating tool path data, and editing tool path data.

During these processes, automatic detection and automatic correction of invalid points based on the present invention is performed in each of the W collection of digitized data and the editing of tool path data. (Details will be described later) The computing device 4 outputs the thus obtained three-dimensional shape machining tool path data to the data medium 5, and sends it to the machine tool 11!6 to machine the item.

Next, with reference to FIGS. 2 to 4, an example of the automatic detection function of an incorrect point provided in the arithmetic unit 4 will be described.

FIG. 2 shows an example of an automatic detection function that focuses on changes in route angle. The calculation device 4 calculates three consecutive points Pi, P from the route data.
Take out the data of 2 and P3 one after another, calculate the angle change a of the g path made by the three points, compare it with a predetermined constant value a0, and if a > a0, point P3 is invalid and the data is Determine that the data is invalid. However, in the judgment of B, iP1-P2-P3 connecting three points is a convex part (when point P2 is above the straight line connecting two points P, - P2 in the Z direction)
Please only do this.

FIG. 3 shows an example of an automatic detection function that focuses on tolerance.

The calculation device 4 calculates the distance aIl between the point P2 and the straight line P1-P3 from the data of the three consecutive points P1, P2, and P3, and compares it with a predetermined constant value l0.
3 is determined to be invalid data. However, in this case too,
The judgment is made when the line PI-P2-P3 connecting the three points is convex upward (
This is performed only when the point P2 is above the straight line connecting the two points PP in the Z direction.

FIG. 4 shows an example of an automatic detection function focusing on the radius of curvature. The calculation device 4 calculates the radius of curvature r at point P2 from the data of three consecutive points Pi, P2, and P3, and calculates the radius of curvature r at a predetermined constant value r.
0 and r
P2-P3 is a seven convex part (point P2 is two points P1-P,
, if the line is above the straight line connecting the

When the arithmetic unit 4 detects invalid data corresponding to any of the three types of automatic detection functions described above, it corrects the invalid data in a predetermined mode (delete, move, etc. of invalid points). Examples of the automatic correction function are shown in FIGS. 5(a) to 5(d).

FIG. 5(a) shows the deletion mode. Now, assume that point 7 is automatically detected as an invalid point and that the deletion mode is specified. The arithmetic unit 4 deletes the data of the incorrect point 7 and automatically corrects the data so that a route 8 directly connects the two points before and after. If you use this deletion mode when editing digitized data, you can create a clean and smooth surface when you perform surface lining using digitized data, since the invalid data will be deleted.

FIG. 5 (bl shows an example of the movement mode. If this movement mode had been specified, the arithmetic unit 4 would delete the invalid point 7 and instead draw a vertical line (Z) 9 passing through the previous point. Ryogura 9 so that the horizontal line (XY) 10 passing through the points after and is the route.
, 10 as new data. However, if the new vertical path heads downward, reverse the vertical and horizontal order,
As shown in Figure 5(d), the horizontal i(XY
) 10 and the vertical line (Z) 9 passing through the latter point as a route, the intersection of both 1% 9 and 10 is set as new data.

FIG. 5 (cl indicates upward movement as another example of the movement mode. When the upward movement mode is specified, the arithmetic unit 4
moves the invalid point 7 to the point 11 above it as new data, and creates routes 12 and 13 that connect the point 11 and the points before and after it.
make.

In the case of the movement mode, the direction of movement may be set to any one axis, only two axes, or three axes simultaneously among X, Y, and Z, and the amount of movement can also be set freely.

As described above, the arithmetic unit 4 automatically detects and corrects invalid point data in the digitized data for the three-dimensional shape and the machining tool path data, thereby automatically obtaining data edited with good quality. be able to.

Effects of the Invention> According to the editing method of the present invention, invalid points in route data can be automatically detected and automatically corrected without the need for human visual inspection or manual correction.

Especially when editing digitized data according to the present invention,
Since fraudulent data can be easily and reliably detected and corrected by deletion,
A clean and smooth surface can be created.

In addition, when machining tool path data such as NC data is collected by the present invention (similarly, fraudulent data can be easily and reliably detected and corrected by deletion, movement, etc.) A surface finish free of scratches can be obtained.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a block diagram showing an embodiment of the present invention;
3 and 4 are explanatory diagrams showing an example of detection of fraudulent data, and FIG. 5 and FIG. 11F are explanatory diagrams showing an example of correcting fraudulent data, respectively. In the drawings, 1 is a digitizer, 4 is an arithmetic unit, and 6 is a machine tool.

Claims (1)

[Claims] By calculating at least one of the angle change, tolerance, and radius of curvature of the route based on the data of the constituent points of the three-dimensional route, invalid points on the route are automatically detected, and the constituent points can be deleted or moved. A method for editing route data, the method comprising automatically correcting detected invalid point data by performing at least one calculation.