JP2629759B2 - Data generation method for numerical control machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to numerical control processing data (part program).
The present invention relates to a creation method, and more particularly to an improvement of a pocket machining data generation method.

[Conventional technology]

As a conventional pocketing data generation method, a zigzag type as shown in FIG. 3 and a spiral type as shown in FIG. 4 are well known.

[Problems to be solved by the invention]

In such a conventional pocket machining data generation method, as shown in FIGS. 3 and 4, the overlap of the tool trajectory data occurs, so that an efficient tool trajectory cannot be obtained. In addition, when the specified figure shape is a complicated shape or when there are multiple island shapes inside the specified figure shape, the program divides the figure shape or creates a new shape area. Auxiliary input such as definition was required, and programming errors were likely to occur, and considerable experience was required for programmers.

Moreover, depending on the shape of the designated graphic shape, it may not be possible to generate pocket machining data.

Therefore, the present invention solves such a conventional problem. The purpose of the present invention is to divide a designated graphic shape into a plurality of shapes by a simple and high-speed method, and to divide each of the divided shapes. By making it possible to make the tool movement of the NC machine tool the simplest and most efficient zigzag method, generating pocket machining data for each shape and joining each shape, An object of the present invention is to provide a method for automatically creating efficient numerically controlled machining data.

[Means for solving the problem]

The numerical control processing data generation method according to the present invention includes an NC machine tool, a numerical control device, and a part program creating device, and generates processing data of a numerical control processing system that processes a processing portion on a workpiece by numerical control. In the control processing data generation method, a) obtaining data representing an extreme point, which is a point at which designated figure shape data representing a figure shape designating the machining portion forms an extreme value; and data representing each of the extreme points and the designated figure Based on the shape data, obtain data representing an intersection at which a straight line drawn in a predetermined direction from each of the poles first intersects a line forming the designated figure shape, data representing each of the intersections, and each of the poles The figure shape is divided by each line segment connecting the pole and the intersection corresponding to the pole based on the data representing the B) obtaining data representing divided graphic shapes corresponding to the plurality of closed regions, and b) determining a moving trajectory of a tool in each of the divided graphic shapes based on the data representing the respective divided graphic shapes. Generating data; c) joining said respective pocketing data together;
Numerical control processing data for processing the processed part is generated.

〔Example〕

FIGS. 1, 2, 5 to 10 show an embodiment according to the present invention.
This will be described in detail with reference to the drawings.

FIG. 2 is a flow chart of a process for implementing the method according to the present invention. FIG. 1 is an explanatory view of a figure shape as an embodiment of the present invention. FIG. 1 (a) is a plan view, and FIG. 1 (b) is a cross-sectional view taken along AB. Here, in FIG. 1 (a), 1 indicates a contour shape, and 2 and 3 indicate island shapes. Hereinafter, a flow chart of the process (FIG. 2) and an explanatory diagram of a graphic shape (FIG. 1) for the present invention
It will be described in detail based on.

(1) Pole calculation processing is performed on all the elements constituting the figure shape. FIGS. 5E to 5C show examples of extreme points. Here, 11, 21, and 31 in the figure represent the extreme points of the respective graphic shapes.

When a shape element parallel to the X axis includes an extreme point as shown in FIG. 5B, the maximum value of the X axis of the shape element is defined as an extreme point here.

FIG. 6 shows a pole shape diagram as an embodiment. In the figure, 21 represents a pole.

(2) Next, a half line is drawn in the plus direction of the X-axis starting from the extreme point found in the above processing, and the intersection calculation processing with all the shape elements is performed. At this time, if an intersection exists, the coordinates of the intersection are stored in a memory of a computer (not shown).

When the intersection calculation processing with all the shape elements is completed, the intersections are sorted in ascending order of the X coordinate, and the shape element having the smallest coordinate point of the X coordinate is divided at the coordinates. Further, a line segment element connecting the pole and the minimum coordinate point is registered in the memory as a new shape element.

The above process is applied to all poles to divide the original figure shape element.

FIG. 7 shows a figure shape subjected to the intersection calculation processing. In the figure
Reference numeral 21 denotes an extreme point, and reference numeral 22 denotes a coordinate point having a minimum X coordinate when the intersection calculation processing with the figure shape is performed.

FIG. 8 shows a shape element diagram divided at the intersection. 10 in the figure represents the end point of the shape element, 20 in the figure,
The newly created shape element is exposed.

(3) A closed region setting process is performed on the shape element generated by the above process. The closed region setting process here is to generate a closed shape by connecting shape elements and generate a shape consisting of only a plurality of contour shapes.

FIG. 9 shows a figure shape subjected to the closed area setting process. In the figure, 101 to 105 represent closed areas A to D, respectively.

(4) For each shape of the closed area obtained by the above processing, a generation process of creating floor plan data with a designated tool diameter is performed.

FIG. 10 shows a plot data locus diagram of the area A in FIG. 9 and 101 in the figure. In addition, the layout data locus of the area is an example, and other methods may be used.
The zigzag method shown in the figure is the simplest, fastest, and efficient.

(5) As a result of performing the above-described processing, five interior layout data trajectory blocks are generated.

By connecting these blocks, all the floor plan data can be generated.

〔The invention's effect〕

As described above, according to the present invention, no matter how complicated the designated graphic shape is, the data representing the extreme points is obtained, and a straight line drawn in a predetermined direction from each extreme point forms the designated graphic shape. First, data representing an intersection that intersects with the first point is obtained, and data representing a divided figure corresponding to a plurality of closed regions formed by dividing the figure at each line segment connecting the pole and the corresponding intersection is obtained. Therefore, it is not necessary to search for divisions that all become convex polygons while judging the irregularities of the polygon, and it is possible to obtain a divided figure shape easily and at high speed, and not only to generate a closed region not including an island shape The tool trajectory can be of a zigzag method by simple reciprocating movement in a predetermined direction without overlapping, and as a result, efficient numerically controlled machining data can be generated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a figure shape according to an embodiment of the present invention.
1 (a) and 1 (b) are a plan view and a sectional view showing a figure shape in an embodiment. 1... Contour shape 2... Island shape 3... Island shape FIG. 2 is a flowchart of a process of a data generation method for numerical control processing according to the present invention. FIG. 3 is a tool locus diagram of a zigzag type system which is an example of a conventional layout data generation method. FIG. 4 is a spiral type tool locus diagram which is an example of a conventional layout data generation method. FIGS. 5 (a), 5 (b), and 5 (c) are diagrams showing examples of extreme points depending on shapes. 11,21,31 ... Pole Figure 6 is a pole figure. FIG. 7 is a diagram of a figure subjected to intersection calculation processing. 21... Pole 22... Intersection FIG. 8 is a shape element diagram divided at the intersection. 10: End point of shape element 20: Newly generated shape element FIG. 9 is a diagram showing a figure subjected to closed area setting processing. 101 A region 102 B region 103 C region 104 D region 105 E region FIG. 10 is a layout data locus diagram of region A in FIG.

Claims (1)

(57) [Claims] 1. A numerical control processing data generation method for generating processing data of a numerical control processing system comprising an NC machine tool, a numerical control device, and a part program generating device for processing a processing portion on a workpiece by numerical control. A) obtaining data representing an extreme point at which designated figure shape data representing a figure shape designating the processed portion is an extreme value; and obtaining data representing the extreme points and the designated figure shape data based on the data representing the respective extreme points. Finding data representing an intersection at which a straight line drawn in a predetermined direction from the pole of the intersection first intersects with the line forming the designated figure shape, data representing each intersection, data representing each pole, and the designated figure Based on the shape data, a plurality of closed regions formed by dividing the figure shape by each line segment connecting the extreme point and the intersection corresponding to the extreme point B) generating pocket machining data for determining a moving trajectory of a tool in each of the divided graphic shapes based on the data representing each of the divided graphic shapes; By joining the pocket machining data,
A method for generating data for numerically controlled machining, wherein data for numerically controlled machining for machining the processed portion is generated.