JPH0523460B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) 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.

(Conventional technology) Conventionally, as a 3D model creation method in CAD equipment, for example, "fleshing out" has been used.
Projections (Fleshing Out)
Projections), IBM Journal Research Developments (IBM J.RES.
DEVELOP.), 25 , No.6, November 1981, P.934−
There is something disclosed in 937.

FIG. 8 is a diagram showing an example of a procedure of the conventional method.
1. It consists of a wire frame model creation step S12, a surf ace model creation step S13, and a model determination step S14. In the three-view diagram input step S11,
The operator inputs three views of the part, that is, a plan view A, a front view B, and a right side view C, into the CAD device (see FIG. 9). Next wireframe model creation step S
At step 12, 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 H, H, T, etc. from the wire frame model 2. In this example, 35 Surf Ace models will be created from the wireframe Moderni. Next, model determination step S14
Now, the operator will proceed to the Surf Ace model creation stage S.
Select the desired model from the multiple Surf Ace models (35 in this example) created in step 13. 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 input/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 explain the operation of the above CAD device, first,
The operator uses the position input/command input device 12 to input a graphic element name (circle, line, etc.) to the position input/command input device 12 by, for example, pressing a menu or position on the digitizer with a stylus pen. Enter the figure position (number, position). This input data is sent to the graphic processing device 13, which outputs the input data to the graphic storage device 16, creates data to be displayed based on the input data, and transfers it 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 step S11).
Next, the wire frame model creation device 14 inputs the three-view data in the figure storage device 16 and creates an eighth model.
Create a wireframe model as shown in Figure D. This wire frame data is sent to the graphic storage device 16 and stored (wire frame model creation step S12). 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 FIG. This Surf Ace model is sent to the graphic storage device 16 and stored (Surf Ace model creation stage S
13). 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 input/command input device 12. Then, the graphic processing device 13 deletes the data of the Surf Ace model other than the determined model stored in the graphic storage device 16 (model determining step S14). 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.

It is an object of the present invention to eliminate the problem of having to select a decision model from a 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 three-dimensional model creation method in the CAD apparatus of the present invention is as follows:
The first step is to store projection drawings of sheet metal parts by type.
means, second means for determining a starting point for three-dimensional scanning from the shape represented by the projection diagram stored in the first means, and a third means having an arm length corresponding to the thickness of the sheet metal part. Using a dimensional scanner, perform a three-dimensional scan of the surf ace of the thick part of the sheet metal part from the starting point determined by the second means based on the data of the projection view stored in the first means; A third means for determining the shape of the Surf Ace model of the sheet metal part based on a trajectory, and a fourth means for storing data of the Surf Ace model determined by the third means. It is something.

(Function) In the present invention, as described above, the three
Having configured the dimensional model creation method, each technical means works 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. Third
The means examines 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, only parallel and rotational movement is possible, the length of the arm is equal to the thickness of the sheet metal part, and both end points are in contact with the shape of the projection of the first means. be exposed. Therefore, the trajectory of the three-dimensional scanner three-dimensionally represents the surf ace of the thick part of the sheet metal part. The fourth means is the third
The Surf Ace model data determined by the above means is stored for display, etc.

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

Figure 1 is a block diagram showing the configuration of the sheet metal surf ace model creation device, which is a characteristic part of the 3D configuration CAD device of this embodiment, and Figure 2 is the 3D configuration.
FIG. 2 is a block diagram showing the configuration of a CAD device.

First, the three-dimensional configuration of this example is shown in Figure 2.
The configuration of the CAD device will be described. As shown in the figure, this CAD device includes a graphic display device 11, a position input/command input device 12, and a graphic processing device 1.
3. Consists of a graphic storage device 16 and a sheet metal Surf Ace model creation device 20. Device 11,1
2, 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 20 is a device that uniquely creates a Surf Ace model from a three-sided view of a sheet metal part.

Next, the configuration of the sheet metal Surf Ace model creation device 20 will be described. As shown in FIG. 1, the sheet metal Surf Ace model creation device 20 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.

Figure 3 shows the sheet metal Surf Ace model creation device 20.
This is a flowchart showing the procedure for creating a Surf Ace model. The Surf Ace model creation operation will be described below with reference to FIG.

First, each projection view is transferred from the figure storage device 16 in 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
1).

Here, a three-dimensional scanner shown in FIG. 4a 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 has scanning ends 31, 32 and a scanning axis 3.
3, and the length of the scanning axis 33 is equal to 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 (Fig. 4b) (2) Rotational movement (Fig. 4c) Furthermore, the three-dimensional scanner moves under the following conditions.

(3) Both scanning ends 31 and 32 should be in contact with the shape of the projection view Next, each of the projection view scan control units 3, 4, and 5 has the above (( A three-dimensional scanner is set at the end point position (see Figure 5) of the shape that satisfies the condition 3) (initial position candidate extraction step S
2).

Next, each of the projection view scanning control sections 3, 4, and 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 corresponding three-dimensional scanner on each projection view, such as the three-dimensional scanner positions 41, 42, and 43 in FIG. . 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
The dimensional coordinates are stored (initial position setting step S3).

Next, each of the projection view scanning control units 3, 4, and 5 sets cases that satisfy the movement conditions (1), (2), and (3) as scanner possible movement data 44, 45 (FIG. 5). Transfer to the dimensional scanning control unit 2 (scannable direction extraction step S)
4). Next, the three-dimensional scanning control unit 2 evaluates the scanning element possible movement data, determines the possible movement of the scanning element in three dimensions, and stores the movement locus of the scanning end in the three-dimensional figure storage unit 1. The coordinates after the movement are stored as shown in ~ in Fig. 6 (scanning movement determination step S).
5).

In this way, the scannable direction extraction step S
By repeating Step 4 and scanning movement determination step S5, the scanner is moved on each projection plane and in three-dimensional space, and the surface 50 of the thick part of the plate is moved.
is constructed, and ends when the three-dimensional scanner comes to the initial position (scanning end determination step S6).
In addition, in FIG. 6, indicates the scanning start point of the three-dimensional scanner, ~ indicates the three-dimensional scanning trajectory and intermediate scanning points,
indicates the end point of the three-dimensional scan.

FIG. 7 is a diagram showing an example of three-dimensional scanning when a sheet metal has an internal shape. In the figure, 29 is a three-dimensional scanning locus and a scanning point, and 60 is the internal shape of the sheet metal.
According to this embodiment, the same processing as described above is performed for such an internal shape 60 as well. Through these series of processes, the uniqueness of the Surf Ace model is guaranteed.

(Effects of the Invention) As explained above in detail, according to the method of the present invention, the surf ace model of the sheet metal part is uniquely determined from the projection drawing, which reduces the number of operations for the operator and the capacity of the figure storage device. You can expect good results.

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 the drawing]

FIG. 1 is a block diagram showing the configuration of a sheet metal surf ace model creation device in a three-dimensional CAD system according to the present invention, FIG. 2 is a block diagram showing the configuration of a three-dimensional CAD system according to the present invention, and FIG. is a flowchart showing the procedure for creating the sheet metal Surf Ace model, Figure 4 is an explanatory diagram of the three-dimensional scanner, and Figure 5 is
The figure is an explanatory diagram of the movement of a three-dimensional scanner, Figure 6 is a diagram showing an example of scanning by a three-dimensional scanner, Figure 7 is a diagram showing an example of three-dimensional scanning of the internal shape of a sheet metal, and Figure 8 is a diagram using the conventional method. An explanatory diagram of a processing example, Figure 9 is a conventional three-dimensional configuration
FIG. 2 is a block diagram showing the configuration of a CAD device. 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... Top view storage part, 7... Front view storage section, 8...Right side view storage section, 1
DESCRIPTION OF SYMBOLS 1... Graphic display device, 12... Position input/command input device, 13... Graphic processing device, 16... Graphic storage device, 20... Sheet metal surf ace model creation device.

Claims (1)

[Scope of Claims] 1. A first means for storing projection views of sheet metal parts for each type; and a first means for determining a starting point for three-dimensional scanning from the shape represented by the projection view stored in the first means. and a three-dimensional scanner having an arm length corresponding to the thickness of the sheet metal part, and based on the data of the projection view stored in the first means, the second means calculates the a third means for three-dimensionally scanning the surf ace of the thick part of the sheet metal part from a starting point, and determining the shape of the surf ace model of the sheet metal part based on the trajectory; 3 in a CAD device characterized by being provided with a fourth means for storing data of a Surf Ace model.
Dimensional model creation method.