JPS62130409A - Composite curved surface generation method - Google Patents

Abstract

PURPOSE:To shorten the curved surface generation time by setting a cutting range to each curved surface and generating a composite curved surface in a part where the set range overlaps. CONSTITUTION:An automatic programing device is composed of a keyboard 101, a processor 102, a curved surface storage memory 106 storing data on generated composite curved surfaces and NC program data for processing the curved surfaces, an output device 107 outputting said data to an external memory medium 108, a graphic display device 109, etc. Thus the drilling range is set to each curved surface. Whenever said range is inputted, the curved surface and the cutting range are plotted on the display device 109. Thus an operator can visually recognize whether the cutting range is correctly specified or not. For generating an actual composite curved surface, the composite curved surface of the part where the cutting ranges overlap can be generated.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a compound curved surface generation method, and particularly to a compound curved surface generation method in which a cutting range is set for each curved surface and a compound curved surface is generated in a portion where the cutting ranges overlap. Regarding.

<Prior Art> A curved surface on a design drawing of a three-dimensional mold or the like is generally represented by a plurality of cross-sectional curves, and shape data between one cross-sectional curve and the next does not exist.

Incidentally, in numerically controlled machining, it is required to process the two cross-sectional curves so as to smoothly connect them, even though such an intermediate shape is not provided. In other words, a curved surface between the above two cross-sectional curves is generated from the data of the cross-sectional curve, data regarding the generated curved surface is stored in an NC tape, and according to instructions from the NC tape. This means that it must be processed. For this purpose, a plurality of intermediate cross sections are generated according to a predetermined rule from several cross sections of a three-dimensional curved body and data specifying cross-sectional curves, and a cross-sectional curve (intermediate cross-sectional curve) of the curved surface body is determined by the intermediate cross sections. A method of generating a curved surface of a three-dimensional curved body using the plurality of generated intermediate cross-sectional curves has been developed and has already been put into practical use. This method is effective because it can generate a smooth curved surface from cross-sectional data.

Incidentally, depending on the processing, processing of a composite curved surface formed by combining two or more three-dimensional curved surfaces, in other words, generation of a composite curved surface may be required. For this reason, the applicant for the patent application
No. 0-39445, a novel composite surface generation method is proposed.

By the way, conventionally, as shown in FIG. 6(A), even when a composite curved surface formed by combining curved surfaces 1a and 1b is required, the range indicated by one point @ line is required. 6. Generate a composite curved surface 2 over the entire range of the curved surface as shown in Figure 6 (B), then use the surface data of the composite curved surface 2 to create NC data for machining by moving the tool in the direction of the arrow, Composite curved surface machining is performed using the NC?
Finally, a wire electrical discharge machine is used to cut the product to obtain the desired composite curved part 3 as shown in FIG. 6(C).

<Problems to be Solved by the Invention> However, in this conventional method, it is necessary to generate a compound curved surface in areas other than the desired compound curved surface portion, which increases the surface generation time and also creates unnecessary compound curved surface portions. Because it is necessary to create NC data for machining the part and also process the part, the NCC deck creation time and curved surface machining time are long (
There is a problem with becoming.

From the above, an object of the present invention is to provide a method for generating a composite curved surface, which can shorten the curved surface generation time and also reduce the processing time of a composite curved surface.

Another object of the present invention is to set cutting ranges for each curved surface and generate compound curved surfaces in areas where the cutting ranges overlap, thereby shortening the curved surface generation time and machining time. It is an object of the present invention to provide a method for generating a composite surface that allows visually confirming whether or not it has been correctly identified.

〈Means for solving problems〉 FIG. 1 is an explanatory diagram of the present invention.

11.12 is a curved surface, lla is a cutting range set on the curved surface 11, and 12a is a cutting range set on the curved surface 12.

Cutting range 11a, l for each curved surface 11.12
Set lb. Note that each time the cutting range of a curved surface is input, the curved surface and cutting range are drawn on the display screen. This allows you to visually check whether the cutting range has been correctly identified.

Then, when actually generating a composite curved surface, a composite curved surface is generated in a portion where the cutting range overlaps.

<Embodiment> FIG. 2 is a block diagram of an automatic programming device that implements the method of the present invention. In the figure, 101 is a keyboard for data input, 102 is a processor, 103 is a ROM 1104 that stores a control program, is a RAM, 105 is a working memory, and 106 is a computer that stores curved surface data of the generated composite curved surface and NC program data for curved surface machining. A curved surface storage memory 107 stores curved surface data of a generated composite curved surface or NC program data for curved surface processing on a paper tape;
An output device outputs to an external storage medium 108 such as a magnetic tape, 109 is a graphic display device, 110 is an address bus, and 111 is a data bus.

The method for generating a composite curved surface according to the present invention will be explained below.

It is assumed that the compound curved surface shown in the shaded area in FIG. 1 is generated as the compound curved surface.

(Al First, input the data specifying the first three-dimensional curved surface 11 and the second three-dimensional curved surface 12 constituting the composite curved surface from the keyboard 101, and
- Enter the area on the Y plane using the area statement, and
Stored in 04. In addition, the names of curved surface 1 and the invention are respectively S.
31. Assume that the area is SS2, and the area is surrounded by straight lines parallel to the X and Y axes.

(Next, data for specifying a large number of cross sections perpendicular to the xy plane that cuts the compound curved surface is input from the keyboard 101 and stored in the RAM 104.

In other words, one straight line on the X-Y plane and the X
- Enter a rule for specifying a number of straight lines on the Y plane.

For example, if each cross section is parallel to the Y axis and perpendicular to the x-Y plane, and the interval between adjacent cross sections is constant, then the intersection line CLi (i=1 .2
,3. ) is shown in Figure 3. Therefore, in such a case, data specifying the first straight line CLI and the distance between two adjacent straight lines are input.

(Next to C1, enter the cut statement (CUT statement) and compound statement (00M2 statement) from the keyboard to set the cutting ranges 11a and 12a of the curved surfaces 11 and 12.The cutting range of the reference curved surface 11 is specified by the CUT statement. The cutting range of the curved surface 12 that constitutes the reference curved surface and the composite curved surface is input using the 00M2 statement.For example, a maximum of 15 curved surfaces can be defined for the reference curved surface.Also, the CUT statement, 00M
2 sentences (for example, entered in the following format.

C1JT, SS 1. VSEC,C,,,C,,
,,H3EC,F,,,,F,Ax;COPM, 3
32. VSEC, C1, l, N, C1, l, H
3EC,F,,N,F,A,; However, Fig. 4 (A)
Referring to , VSEC is the cutting direction, CM,... C□
are the minimum and maximum values (%) in the cutting direction, H8EC is the feed direction, and FM 1Hp FM□ are the minimum and maximum values (%) in the feed direction. In addition, in reality, the range CI in each cutting direction,
, □, CMA0 is area 11' specified by area statement
The width in the cutting direction (see FIG. 4(B)) is set as 100 (%), and the width is determined as a percentage of that width. Further, the range FMIN'FMAX in each feed direction is similarly determined as a percentage of the width in the feed direction of the area 11' specified by the area statement as 100 (%).

(If the cutting range of the curved surface 331 (11) is specified by the dl CU T statement, the X-Y projected outline 21 and cutting range outline 22 of the curved surface are drawn in different colors on the CRT of the graphic display device 109. .

Next, when the cutting range of the curved surface 332 (12) is specified with the 00M2 statement, the X-Y projected contour line 31 and cutting range contour line 32 of the curved surface are superimposed on the figures displayed so far and are displayed in different colors. CRT of graphic display device 109
is drawn on.

With the above, the operator can visually confirm the set cutting range. If you want to correct the cutting range, use C
Correct it with the UT sentence or 00M2 sentence. As a result, C
A new corrected cutting range is drawn instead in RT.

Incidentally, the above is a case where there are two curved surfaces, but if the CUT statement and 00M2 statement are input for two curved surfaces, the N curved surfaces and the cutting range of each curved surface will be drawn on the CRT.

tel When each data is input, the processor 102 cuts the area where the cutting ranges 11a and 12a overlap (hatched lines in Figure 1).
In the previously proposed method, the uppermost curved surface portion (with the largest Z coordinate value) is output, and no curved surface is generated in the portion outside the overlapping range. However, in a portion of the set range that does not overlap, a curved surface to which the set range is set may be output.

It should be noted that the section determined by the data input in step fb) is cut, and the section curves of the curved surfaces 11 and 12 within the above-mentioned overlapping range obtained by the cutting are output with a large Z coordinate value, and the entire section is A composite curved surface is generated by performing similar processing on

The composite curved surface data generated as described above is stored in the curved surface storage memory 106, and then outputted from the output device 107 either as is or after being converted into NC data for curved surface machining.

Although the case where two curved surfaces are combined to generate a composite curved surface has been described above, the present invention is not limited to two curved surfaces.

<Effects of the Invention> According to the present invention, since a cutting range is set for each curved surface and a composite curved surface is generated in the portion where the ranges overlap, the curved surface generation time can be shortened and , the machining time for complex curved surfaces can be shortened,
Furthermore, each time the cutting range is set, it is drawn on the display screen so that it can be visually checked, so the cutting range can be set correctly.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the present invention, Fig. 2 is a block diagram of an automatic programming device implementing the present invention, Fig. 3 is an explanatory diagram of the process for specifying the cutting surface, and Fig. 4 is an explanation of the cutting range. 5 is an example of drawing a cutting range, and FIG. 6 is an explanatory diagram of a conventional compound curved surface generation method. 11.12...Curved surface, 11a, 12a...Composite curved surface generation clause set on curved surfaces 11, 12 Patent applicant: Fanuc Corporation Representative Patent attorney: Chiki Saito Figure 1 Figure 3 Figure 4 Figure 5 t4 Do (B) Figure 6

Claims (1)

[Claims] In a method of generating a composite curved surface by combining at least two three-dimensional curved surfaces, a cutting range is set for each curved surface, and a composite curved surface is generated in a portion where the cutting ranges overlap. and a method for generating a composite curved surface, characterized in that each time the cutting range of the curved surface is input, the curved surface and the cutting range are drawn on a display screen.