JPH05324773A - Parts shape resoluting system in cad system - Google Patents

Abstract

PURPOSE:To eliminate an operation for parts assembly such as layer and group and to perform the operation without allowing a designer to interrupt the design concepts. CONSTITUTION:The CAD system is constituted of a graphic display device 1, graphic display processing section 2, parts shape resolution processing section 3, keyboard 4, coordinate input device 5, and external storage device 7 storing a resolution file 6. A projection area specifying section 3-2 and projection surface shape segmenting processing section 3-3 are provided on a parts shape resolution processing section 3. The section 3-2 decides the segmenting area of each projection surface including an optional parts shape from an entire design diagram according to the instruction of an operator. The section 3-3 takes out the prescribed parts shape from the segmented area, and the shape processing section eliminates unnecessary lines such as isolated lines and duplicated lines from the segmented parts shape, thereby extracting the drawing of the prescribed parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a CAD system for drafting used in machine design, is constructed from a partial shape in which parts are combined and displayed in design drawing data. The present invention relates to a part shape decomposition method in a CAD system for designating and extracting any given single part shape.

[0002]

2. Description of the Related Art In the prior art, in a CAD system for drafting used at the time of machine design, manufacturing for producing parts constituting the designed apparatus from an overall design drawing or a partial design drawing. When a drawing (hereinafter referred to as "parts diagram") is extracted (hereinafter referred to as "disassembled"), multiple parts are displayed in a complex combination in the designed overall view of the device. Disassembling and identifying a single part was a very cumbersome task.

Therefore, in recent CAD systems,
As shown in FIG. 6, management is performed using a layer function for layering and managing each component shape, and a group function for handling a plurality of component shapes as one aggregate as shown in FIG. It is common to do. By managing with such a parts assembly, a layer or group can be specified when extracting the manufacturing drawings for manufacturing the components that compose it from the overall design drawing or the partial design drawing. The disassembly work is easy because the shape of a single part can be easily identified by.

[0004]

However, while the functions described above make it easy to disassemble the overall design drawing into the component parts drawings, the designer is always aware of management of the parts set during design thinking, and always uses layers or It is necessary to switch the group to operate, and the designer who operates the CAD system has a problem that the design thinking must be interrupted each time and the operation becomes troublesome and complicated.

The present invention has been made in view of the above points, and eliminates the above-mentioned problems and replaces the layers and groups described above.
It is an object of the present invention to provide a part shape decomposition method in a CAD system that allows a designer to work without interrupting design thinking by eliminating the operation of a part assembly.

[0006]

In order to solve the above problems, the present invention provides a graphic display device 1, a graphic display processing unit 2, a component shape decomposition processing unit 3, a keyboard input device as shown in FIG. CA composed of 4, coordinate input device 5, and external storage device 7
In the device D, in addition to the management information input processing unit 3-1, the shape processing unit 3-4, and the disassembly file output unit 3-5 in the component shape disassembly processing unit 3, the projection surface area designating unit 3-2 and the projection surface shape cutout are provided. A processing unit 3-3 is provided so that a drawing of a required component part can be extracted from a target overall design drawing according to an operator's instruction.

[0007]

The projection surface area designating unit 3-2 provided in the present invention determines the cutout area of each projection surface including an arbitrary part shape from the overall design drawing according to the instruction of the operator, and the projection surface shape cutting processing unit 3-2. 3 removes a predetermined part shape from the cut out area, and the shape processing unit 3-4 deletes unnecessary lines such as isolated lines and overlapping lines accompanying the extracted part shape, and draws a drawing of the predetermined part part. Extract.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a processing block diagram of a component shape decomposition method in a CAD device of the present invention. As shown in the figure, this system is an external storage in which a graphic display device 1, a graphic display processing unit 2, a component shape decomposition processing unit 3, a keyboard input device 4, a coordinate input device 5, and a decomposition file 6 are stored. It is composed of the device 7. The component shape decomposition processing unit 3 includes a management information input processing unit 3-1, a projection surface area designating unit 3-2, a projection surface shape cutting processing unit 3-3, a shape processing unit 3-4, and a decomposition file output unit 3-5. Composed of.

The graphic display device 1 is a display device for displaying the graphic generated by the graphic display processing section 2. The component shape decomposition processing unit 3 performs processing such as graphic generation and extraction of the shapes of constituent components from the input information, and the details will be described later. Keyboard
The mode input device 4 comprises a keyboard or the like for inputting numerical information, and the coordinate input device 5 inputs designation of a function menu or coordinate value information. The disassembly file 6 is a file that stores the generated parts shape and the like, and is provided in the external storage device 7.

First, the management information input processing section 3-1 defines the drawing management information of the disassembly file 6 based on the information such as the drawing number and the name input from the keyboard input device 4. The projection plane area designating unit 3-2 determines the disassembled cutout area of each projection plane of the component shape based on the coordinate value information sent from the coordinate input device 5. The projection surface shape cutout processing unit 3-3 takes out the component shape in the disassembled cutout area determined by the projection surface area designating unit 3-2. The shape processing unit 3-4 deletes the isolated line and the overlapping line with respect to the cut-out part shape.

The processed part shape is sent to the graphic display processing unit 2 and displayed on the graphic display device 1. At this time, it is possible to delete the other component graphic elements which have not been deleted by the shape processing unit 3-4 by conversation with the operator. The part shape of each projection surface processed in this way is sent to the disassembly file output unit 3-5, and is output and stored in the disassembly file 6 determined by the management information input processing unit 3-1.

The above-mentioned processing steps are shown by an example of the projection plane cutout processing in FIG. First, the operator inputs the coordinates of each projection surface part shape cutout area from the coordinate input device 5 and designates the polygon windows 16, 17, 18 (dotted line portion in FIG. 2). The projection plane area designating unit 3-2 sends the projection plane cutout information to the projection plane shape cutout processing unit 3-3. From this information, the projection surface shape cut-out processing unit 3-3 recognizes an element that completely fits within the polygon window and an element that crosses the polygon window boundary line, and elements 16 to 28, 17 that cross at 16 polygon window boundary lines. The elements 29 to 34 crossing at the polygon window boundary line of No. 3 and the elements 35 to 36 crossing at the polygon window boundary line of No. 18 are divided at the intersections. These elements are extracted and the shape of FIG. 3 is extracted and sent to the shape processing unit 3-4.

In the shape processing section 3-4, the points 37 to 52 intersecting with other elements for the elements divided by the polygon window.
(• mark in FIG. 3) is detected and divided. After that, one or both of the element end points is not connected to the other element 53.
Delete ~ 69. At this time, the element 7 is removed so that one or both of them are not connected to other elements.
Similarly, 0 and 71 are deleted. Further, as shown in FIG. 4, when there are overlapping lines 72 and 73 on the same line, the maximum line lengths 74 and 75 are obtained and converted into single lines to form single lines 76 and 77.

The part shape processed as shown in FIG. 5 is sent to the graphic display processing unit 2 and displayed on the graphic display device 1. Here, since elements 78 and 79 (FIG. 5) other than the desired part shape may remain, a message prompting the operator to delete the shape of the other part shape is displayed to cause the interactive deletion. Parts shape drawings 80, 81, 82 determined by the above
Is sent to the disassembly file output unit 3-5, is output to and stored in the disassembly file 6 as a single-part diagram, and the processing ends.

[0015]

As described in detail above, according to the present invention, the following effects are expected. It is possible to easily disassemble into component parts shapes by specifying an arbitrary part shape part from the overall design drawing designed on a single layer or a single group. Management or group management becomes unnecessary, and it becomes unnecessary to be aware of management of parts set. Therefore, the designer does not have to interrupt the design thinking in the middle of design due to switching operation, etc.
Can be designed.

[Brief description of drawings]

FIG. 1 is a processing block diagram of a component shape decomposition method in a CAD device of the present invention.

FIG. 2 is a diagram illustrating an example of a projection plane cutout process.

FIG. 3 is a diagram illustrating an example of a shape processing unit process.

FIG. 4 is a diagram illustrating an example of overlapping line processing on the same line.

FIG. 5 is a diagram showing an example after deleting another component shape figure.

FIG. 6 is a diagram illustrating a layer function of a conventional technique.

FIG. 7 is an explanatory diagram of a group function of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Graphic display device 2 Graphic display processing unit 3 Component shape decomposition processing unit 3-1 Management information input processing unit 3-2 Projection surface area designation unit 3-3 Projection surface shape cutout processing unit 3-4 Shape processing unit 3-5 Disassembly File output unit 4 Keyboard input device 5 Coordinate input device 6 Disassembly file 7 External storage device

Claims (1)

[Claims] 1. A CAD system having a graphic display means for displaying a graphic generated during drafting and an input means for inputting data necessary for the graphic display means, wherein the target overall design displayed on the graphic display means. A means to enclose each projection surface of an arbitrary part shape from a drawing or partial view as a designated area, a means to cut out the part shape in the designated area specified, and an intention from the cut out part shape for each projection surface A part shape decomposing method in a CAD system, which is provided with a means for removing shapes other than the shape to be processed and a means for outputting each determined projection surface part shape to a specified file.