JPS61105615A - Working area designating system of nc data generating device - Google Patents

Abstract

PURPOSE:To perform optimum three-dimensional working by fetching data related to an inputted edge line from a shape model data memory, determining a surface to be worked of a work, and designating an edge line for showing an area to be worked. CONSTITUTION:A graphic input device 1 is constituted of a light pen, a tablet, a stylus, a keyboard, etc., picks up successively an edge line name in a shape model of a work to be a working area, and inputs it to an edge line recognizing part 2. The whole model is displayed on a graphic output device 6 through a shape model display part 8. A working area determining part 3 transfers and stores these data in a working area data memory 4, and a working area display part 5 outputs an edge line related to each face by a designated color on the graphic output device 6, based on data related to faces F1-F8 from the working area determining part 3. On a picture of the graphic output device 6, a designated edge line is displayed by a designated color by being superposed on a parallel projection drawing of a three- dimensional shape model of the work and the edge line name of all edge lines, and a moving path of a tool to be generated is determined. In this way, NC data of high working efficiency can be generated, and the working accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field of the invention) This invention provides three methods for controlling a workpiece by using an NG (numerical control) device.
The present invention relates to a machining area designation method in an NC data creation device that generates a tool trajectory for machining into a dimensional shape.

(Technical background of the invention and its problems) NO machine tools or machining centers are operated by an NC program that provides NG data and commands such as the path the tool should move, i.e., coordinate values, tool feed rate, spindle rotation speed, etc., to the NC device. Normally, the NC program to be operated is recorded on an NG tape, which is a perforated paper tape, and is run through the tape league of the NC control device. However, when machining a surface with a three-dimensional shape such as a free curve, manually creating NG data is extremely time-consuming and involves many errors, resulting in poor work efficiency. Therefore, recently, by making full use of the excellent memory and processing power of computers, graphic output devices that can express a variety of graphics, such as CRT, have been developed.
NC data is created using a graphic processing technique in which a three-dimensional shape of a workpiece is directly displayed on an apparatus for processing. An NC data creation device is a device that uses this technology to automatically create NC data of a tool movement path, that is, a tool trajectory when machining a workpiece into a three-dimensional shape.

FIGS. 4(A) and 4(B) are diagrams illustrating a conventional NG data creation method using an NC data creation device. Conventionally, in an NC data creation device that generates a tool trajectory for machining a three-dimensional shape of a workpiece consisting of multiple surfaces, the NC data is generally calculated using multiple surfaces as a machining area for each surface, as shown in the same figure (A). Either a single degree surface machining area method is used to create data, or a full-surface single machining area method is used to create NC data by treating all surfaces of the three-dimensional shape shown in Figure (B) as one machining area. . However, the single surface machining area method
The next surface cannot be machined until the machining of one surface is completed.
There is also a problem in that machining efficiency is poor because there is a lot of wasted movement of the tool, and so-called cutter marks are left at the boundary of the machining area when machining the negative surface, resulting in poor machining accuracy. On the other hand, in the case of the whole-surface-one-machining-area method, for example, the part of the main body shown in FIG. Even if it is clear, it is not possible to divide the machining area and change the machining direction, which may result in poor machining efficiency.Also, since the tool moves at a constant pitch over the entire surface, the path 49 shown in Fig. 5 (B) There was a problem in that the cross-hatched area between the openings remained uncut, the edges of the workpiece shape were unclear, and the edges were poorly finished.

In this way, in the conventional NC data creation device, three parts of the workpiece are
It was not possible to select arbitrary multiple faces of a dimensional shape as one machining area and generate an optimal tool trajectory.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to make it possible to carry out optimal three-dimensional machining in accordance with the shape of the workpiece. An object of the present invention is to provide a machining area designation method in an NC data creation device that can designate any plurality of faces constituting a three-dimensional shape of a workpiece as a machining area by designating a ridge line indicating the shape of the workpiece.

(Summary of the Invention) The machining area designation method in the NC data creation device of the present invention includes a shape model display section that displays the three-dimensional shape and edge line name of the workpiece to be machined on a graphic output device; A shape input section for inputting a shape, a shape model data memory storing various data related to the shape, an edge line recognition section for extracting data related to input edges from the shape model data memory, and a surface to be machined of the workpiece based on the edge line data. a machining area determination unit that determines the machining area and stores it in the machining area data memory;
A machining area data memory to be stored for use in machining,
It is composed of a machining area display section that displays the inputted designated machining area on the figure output device, and the processing is performed according to a predetermined procedure using these components.

(Embodiment of the Invention) FIG. 1 is a block diagram of an embodiment of a device that implements a machining area designation method in an NC data creation device according to the present invention. Now, on the screen of the graphic display device 6 such as a CRT, the second
Assume that a workpiece having a three-dimensional shape as shown in Figure (A) is displayed. The graphic input device 1 is composed of a light pen, a tablet, a stylus, a keyboard, etc. If the keyboard is used, the name of the edge in the shape model of the workpiece that is to be the machining area, for example, El, E2. E5. EIO, El5, E
IB, El? , El8. El9. ε24. E
2B, ε25°ε22. ε13. Directly recognize the ridge names E8 and E3 in sequence! ! Enter into 2. Also,
Similarly, when using a tablet or stylus,
l.

E2. E5. ...El3. E8. The edge lines corresponding to E3 are sequentially picked and the edge line base is input to the edge line recognition unit 2. The shape model data memory 7 is a database related to shape model data, and stores data related to shapes such as various straight lines, 9 circular arcs, parabolas, 1 conical surface, and cylindrical surface. It is designed to be displayed on the graphic output device 6 via. The edge line recognition unit 2 takes out edge line data corresponding to the edge line base inputted by the graphic input device 1 from the shape model data memory 7 and outputs it to the processing area determining unit 3. The machining area determination unit 3 reads out necessary data regarding the machining surface Fl-F8 surrounded by the input ridgeline shown by the thick line in FIG. 2(A) from the shape model data memory 7, and actually uses it for NC machining. For this purpose, these data are transferred to the processing area data memory 4 and stored therein. This processing area data memory 4 functions as a register for creating NO data.

The machining area display section 5 displays planes F1 to F from the machining area determining section 3.
Based on the above-mentioned data regarding 8, the ridge lines regarding each surface F1 to FB are printed on a graphic output device M such as a CRT in the specified color for the ridge lines.
Output to 6. The shape model display unit 8 receives the data of all edges regarding all the surfaces Fl-FIB necessary for displaying the three-dimensional shape of the workpiece from the shape model data memory 7, and displays the three-dimensional shape model of the workpiece in accordance with the start signal SS. The parallel projection of and the edge base El of all edges.

E2. ..., E33 is output to the graphic output device M6. Therefore, on the screen of the graphic output device 6, the specified edge line is displayed in the specified color, superimposed on the parallel projection view of the three-dimensional shape model of the workpiece and the edge line base of all the edge lines. Here, the movement path of the tool to be generated, that is, the tool trajectory is shown in Figure 2 (B
) is determined as shown by the arrow.

FIG. 3 is a flowchart illustrating a machining area designation method in the NC data creation device of the present invention. First, a command is given to the shape model display section 8 to read out and display the parallel projection view of the three-dimensional shape model of the workpiece and all edge line names from the shape model data memory 7 on the screen of the graphic output device 6 (
Step St), Next, it is checked whether all the ridge lines to be the machining area of the workpiece have been inputted on the screen of the graphic output device 6 by the graphic input device (Step S2),
If all the edges of the shape model of the workpiece to be processed are not input, input the edges (step S3).
), then the data regarding the input edge line is taken out from the shape model data memory 7 (step S4), and the process returns to step S2. On the other hand, if all the ridgelines to be the machining area have been input in the judgment step S2, the machining surface of the shape model of the workpiece surrounded by the input ridgelines is extracted by the machining area determination unit 3, and the machining surface related to the machining surface is The data is transferred from the shape model data memory 7 to the machining area data memory 4 and saved (step 55).Next, the data stored in the machining area data memory 4 is used to determine the surface to be machined, for example, as shown in FIG. Surfaces F1 to F8 of (A) are displayed three-dimensionally according to the screen coordinates, (Step S8)
, After the creation of NC data for the surfaces F1 to F8 to be NC data is completed, other surfaces of the workpiece are specified for processing in the same procedure, thereby realizing efficient processing.

(Effects of the Invention) As described above, according to the machining area specification method in the NC data creation device of the present invention, any plurality of surfaces of a three-dimensional workpiece can be specified as the machining area, so that NC data with high machining efficiency can be obtained. can be created, there are no cutter marks on the workpiece, and there are no uncut edges, resulting in good machining accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a device that implements the machining area designation method in the NC data creation device of the present invention;
FIGS. 2(A) and (B) are diagrams for explaining the machining area designation method of the present invention, and FIG. 3 is a flowchart for explaining the machining region designation method in the NC data creation device of the present invention.
FIGS. 4A and 4B are diagrams showing a conventional machining area designation method, and FIGS. 5A and 5B are diagrams explaining a conventional machining region designation method. 1... Graphic input device, 2... Edge line recognition unit, 3...
Machining desired area determination unit, 4... machining area data memory, 5.
...Processing area display section, 6...Graphic output device, 7...
Shape model data memory, 8... Shape model display section. Applicant Yu Yasugata 3rd 2nd Hard (A) Brown 3rd Session 4th Figure (A) (fl) L 5 Figure (,4) " (B)

Claims (1)

[Claims] In the machining area specification method of the NC data creation device that generates tool trajectories for machining the three-dimensional shape of a workpiece consisting of multiple surfaces, the three-dimensional shape model of the workpiece is displayed on the screen of the graphic output device using the parallel projection method. Display all edge line names, input to form a closed area of the edge line specifying the machining area in the three-dimensional shape model of the workpiece, and extract data related to the input edge line of the workpiece. The surface of the three-dimensional shape model of the workpiece surrounded by the closed area of the input edge line is extracted, the data is stored in a machining area data memory, and the workpiece surface is displayed on both sides. Features: Machining area designation method in NC data creation device.