JPS62210580A - Three-dimensional model generating system for cad device - Google Patents

Abstract

PURPOSE:To reduce operation man-hours of an operator, by providing a sheet metal surface model generating device which generates a surface model uniquely from the trihedral drawing of a sheet metal parts. CONSTITUTION:A three-dimensionally constituted CAD device is equipped with a sheet metal surface model generating device 20 other than a graphic display device 11, a position input/command input device 12, a graphic processor 13, and a graphic storage device 16. The generating device 20 inputs the trihedral drawing data of the sheet metal parts stored in the storage device 16, and performs a scan by three-dimensional scanner based on the data, and decides and generates uniquely the shape of a surface model. In such a case, as the three-dimensional scanner, the one having an arm length corresponding to the plate width of the sheet metal parts is used. In this way, the operation man- hours of the operator can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a three-dimensional model creation method in a CAD device, and particularly relates to the creation of a surf ace model of a sheet metal part.

(One Conventional Technology) Conventionally, as a three-dimensional model creation method in a CAD device, for example, [Fleshing Out Projection]
s) j, IBM Journal Research Developments (IBM J, RES, DEVELOP,)
, Sarashi, 46. November 1981, p. 934-937.

FIG. 8 is a diagram showing an example of a procedure of the conventional method. As shown in the figure, the conventional method includes a three-view diagram input stage Sll, a wire frame model creation stage S12, a surf ace model creation stage 813, and a model determination stage S14. Everything will be fine. In the three-view drawing input step Sll, the operator inputs the three-view drawings of the component, that is, the plan view (a), the front view (b), and the right side view e→ into the CAD device (see FIG. 9). In the next wireframe model creation step 812, the CAD device automatically creates a wireframe model. Then, in the Surf Ace model creation step S13, the CAD device automatically creates Surf Ace models (E), (E), (G), etc. from the wire frame model (). In this example, 35 Surf Ace models will be created from the wireframe model. Next, in the model determination step S14, the operator selects a desired model from the plurality of Surf Ace models (35 types in this example) created in the Surf Ace model creation step S13. In the conventional method, a surf ace model was created as described above.

FIG. 9 is a diagram showing an example of the configuration of a conventional three-dimensional CAD device. This CAD device includes a graphic display device 11, a position/command input device 12, a graphic processing device 13, a wire frame model creation device 14, a surf ace model creation device 15, and a graphic storage device 16.

To describe the operation of the CAD device, first, the operator uses the position/command input device 12 to press a menu or position on the digitizer with a stylus pen, and then inputs the following information to the position/command input device 12: Enter the figure element name (circle, line, etc.) and figure position (number, position). This input data is sent to the graphic processing device 13, and the graphic processing device 13 transfers the input data to the graphic storage device 1.
At the same time, data to be displayed is created based on the input data and transferred to the graphic display device 11. The graphic storage device 16 stores graphic element names and graphic position data, and the graphic display device 11 displays the created graphic (three-view drawing input stage 511). Next, the wire frame model creation device 14 receives the three-view data in the graphic storage device 16 as input and creates a wire frame model as shown in FIG. This wireframe data is sent to the graphic storage device 16 and stored (wireframe model creation stage 5).
12). Next, the Surf Ace model creation device 15 inputs the wire frame data in the graphic storage device 16 and creates a Surf Ace model as shown in (E), (E), (G), . . . in FIG. This Surf Ace model is sent to the graphic storage device 16 and stored (Surf Ace model creation step 513). Then, the operator views the plurality of Surf Ace models displayed on the graphic display device 11 and selects the model to be determined via the position/command input device 12. Then, the graphic processing device 13 converts to the graphic storage device 16.
The data of Surf Ace models other than the determined model stored in is deleted (model determining step 514). In the manner described above, the Surf Ace model desired by the operator can be obtained.

(Problems to be Solved by the Invention) However, when the method described above is applied to general parts, a large number of Surf Ace models are created from one three-view diagram. Therefore, there is a problem in that selecting a decision model from among them requires a large amount of man-hours.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the problem of having to select a decision model from the large number of surf ace models described above regarding sheet metal parts, and to provide an excellent CAD device that requires fewer operating steps.

(Means for Solving the Problems) In order to solve the problems of the prior art, the CAD of the present invention
The three-dimensional model creation method in the device includes a first means for storing a projection view of a sheet metal part for each type of projection view, and a method for three-dimensional scanning based on the shape represented by the projection view stored in the first means. Using a second means for determining the starting point and a three-dimensional scanner having an arm length corresponding to the thickness of the sheet metal part, the second means was used to determine the starting point based on the data stored in the first means. a third means for determining the shape of the three-dimensional surf ace model of the sheet metal part by performing a three-dimensional scan of the surf ace in the thick part of the sheet metal part from a starting point; and a three-dimensional surf ace model determined by the third means. and a fourth means for storing data.

(Function) In the present invention, since the three-dimensional model creation method in the CAD device is configured as described above, each technical means functions as follows. Note that the present invention particularly targets the creation of three-dimensional models of sheet metal parts.

The first means stores projection views (for example, three orthographic views of a plan view, a front view, and a right side view) of sheet metal parts for each type. The second means accesses each shape stored in the first means, determines the starting point for the three-dimensional scan, and sends that information to the third means. The third means investigates the data stored in the first means, obtains possible motion data of the three-dimensional scanner, and scans the three-dimensional scanner from the starting point obtained by the second means based on the data. The shape of the three-dimensional surf ace model of the sheet metal part is uniquely determined. Here, as a three-dimensional scanner, one that is capable of only parallel and rotational movement, whose arm length is equal to the thickness of the sheet metal part, and whose both end points are in contact with the shape of the projection view of the first means is used. be exposed. Therefore, the locus of the three-dimensional scanner three-dimensionally represents the surf ace of the thick part of the sheet metal part. The fourth means stores the surf ace model data determined by the third means for display, etc.

(Example) Examples of the present invention will be described in detail below.

FIG. 1 is a block diagram showing the configuration of a sheet metal surf ace model creation device which is a characteristic part of the three-dimensional CAD device of this embodiment, and FIG. 2 is a block diagram showing the configuration of the three-dimensional CAD device.

First, the configuration of the three-dimensional CAD apparatus of this embodiment will be described with reference to FIG. As shown in the figure, this CAD device includes a graphic display device 11, a position input/command input device 1, and a position input/command input device 1.
2. Consists of a graphic processing device 13, a graphic storage device 16, and a sheet metal surf ace model creation device. Device 11
, 12, 13 and 16 are similar to each device in FIG. 9, and are given the same reference numerals.

The sheet metal Surf Ace model creation device is a device that uniquely creates a Surf Ace model from three-view drawings of sheet metal parts.

Next, the configuration of the sheet metal Surf Ace model creation device will be described. As shown in FIG. 1, the sheet metal Surf Ace model creation device includes a three-dimensional figure storage unit 1 that stores data of the created Surf Ace model, a three-dimensional scanning control unit 2 that determines the shape of the Surf Ace model, A plan view scanning control section 3 that investigates the shape of the plan view, a front view scanning control section 4 that investigates the shape of the front view, a right side view scanning control section 5 that investigates the shape of the right side view, and a top view scanning control section 5 that investigates the shape of the plan view. It is composed of a plan view storage section 6 for storing therein, a front view storage section 7 for storing shape data for a front view, and a right side view storage section 8 for storing shape data for a right side view.

FIG. 3 is a flowchart showing the procedure for creating a Surf Ace model using the sheet metal Surf Ace model creating device. The operation of creating the Surf Ace model will be described below with reference to FIG.

First, each projection view is transferred from the graphic storage device 16 of FIG. 1 to the plan view storage unit 6, front view storage unit 7, and right side view storage unit 8 (projection view storage step S1).

Here, a three-dimensional scanner shown in FIG. 4(a) is assumed.

The three-dimensional scanner is a figure set for the necessity of processing in order to detect the plate thickness portion of each projection view. That is, the three-dimensional scanner is composed of scanning ends 31 and 32 and a scanning axis.
The length of the scanning axis is the thickness t of the sheet metal part.

This three-dimensional scanner is only allowed to move in the following two ways.

(1) Parallel movement (Figure 4(b)) (2) Rotational movement (Figure 4 (C)) Furthermore, the three-dimensional scanner moves under the following conditions.

(3) Both scanning ends 31 and 32 are in contact with the shape of the projection view.Next, each projection view scanning control section 3,4.5 controls each storage section 6,
7.8, a three-dimensional scanner is set at the end point position (see FIG. 5) of the shape that satisfies the condition (3) above (initial position candidate extraction step S2).

Next, each projection view scanning control section 3, 4.5 transfers the set position data of the three-dimensional scanner to the three-dimensional scanning control section 2. The three-dimensional scanning control unit 2 compares the position data of the three-dimensional scanners and determines the positions of the three-dimensional scanners 41 , 42 , 42 , 42 in FIG.
43, a three-dimensional scanner corresponding to each projection view is determined. Then, the determined three-dimensional scanner information is sent to the three-dimensional figure storage unit 1, and the three-dimensional figure storage unit 1
(initial position setting step S3).

Next, each projection view scanning control unit 3, 4.5 sets the movement condition (
Cases satisfying 1), (2), and (3) are transferred to the three-dimensional scanning control unit 2 as scanner possible motion data 44, 45 (Fig. 5) (scannable direction extraction step S4).
).

Next, the three-dimensional scanning control unit 2 evaluates the scanner possible movement data to determine possible movements of the scanner in three dimensions;
The coordinates after the movement are stored in the three-dimensional figure storage unit 1, including the locus of movement of the scanning end, as shown in (1) to (2) in FIG. 6 (scanning movement determining step S5).

In this way, by repeating the scannable direction extraction step S4 and the scanning movement determination step S5, the scanner is moved on each projection plane and in three-dimensional space, and the surf ace ( 50 is constructed, and the process ends when the three-dimensional scanner comes to the initial position (scanning end determination step 86). In FIG. 6, ■ indicates the scanning start point of the three-dimensional scanner, ■ - [phase] indicates the three-dimensional scanning locus and intermediate scanning points, and @ indicates the three-dimensional scanning end point.

FIG. 7 is a diagram showing an example of three-dimensional scanning when a sheet metal has an internal shape. In the figure, @~[phase] are three-dimensional scanning loci and scanning points, and marks are internal shapes of the sheet metal. According to this embodiment,
The same processing as described above is also performed for such internal shape marks. Through these series of processes, the uniqueness of the Surf Ace model is guaranteed.

(Effects of the Invention) As described above in detail, according to the method of the present invention,
The Surf Ace model of the sheet metal part can be uniquely determined from the projection drawing, and the effect of reducing the number of operations for the operator and the capacity of the figure storage device can be expected.

Furthermore, it is also possible to use the three-dimensional locus on the sheet metal part obtained by this method to create the developed shape of the part.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a sheet metal surf ace model creation device in a three-dimensional CAD device according to the present invention, FIG. 2 is a block diagram showing the configuration of a three-dimensional CAD device according to the present invention, and FIG. is a flowchart showing the procedure for creating a sheet metal Surf Ace model, Fig. 4 is an explanatory diagram of the 3D scanner, Fig. 5 is an explanatory diagram of the movement of the 3D scanner, and Fig. 6 is an example of scanning by the 3D scanner. 7 is a diagram showing an example of three-dimensional scanning of the internal shape of a sheet metal, FIG. 8 is an explanatory diagram of an example of processing by a conventional method, and FIG. 9 is a block diagram showing the configuration of a conventional three-dimensional configuration CAD device. be. DESCRIPTION OF SYMBOLS 1... Three-dimensional figure storage part, 2... Three-dimensional scanning control part, 3... Top view scanning control part, 4... Front view scanning control part, 5... Right side view scanning control part , 6... Plan view storage section, 7... Front view storage section, 8... Right side view storage section,
11... Graphic display device, 12... Position/command input device, 13... Graphic processing device, 16... Graphic storage device, Machining... Sheet metal Surf Ace model creation device.

Claims (1)

[Claims] First means for storing projection views of sheet metal parts for each type of projection view; and determining a starting point for three-dimensional scanning from a shape represented by the projection view stored in the first means. Using a second means and a three-dimensional scanner having an arm length corresponding to the thickness of the sheet metal part, the sheet metal part is scanned from the starting point determined by the second means based on the data stored in the first means. a third means for determining the shape of a three-dimensional surface model of the sheet metal part by three-dimensionally scanning the surface of the thick part of the part; and a third means for determining the shape of the three-dimensional surface model of the sheet metal part; A three-dimensional model creation method in a CAD device, characterized in that a fourth storage means is provided.