JPH1115857A - Device and method for detecting interference component in two-dimensional cad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply highly precise interference verification also to general components other than sheet metal components in a two-dimensional(2D) CAD. SOLUTION: An interference verification preprocessing part 41 reads out component shape data from a storage part 30 and calculates an overlapped area in which the rectangular areas of respective components in respective projected faces of a three-face drawing are overlapped. When the overlapped area calculated by the preprocessing part 41 exists in all projected faces, a 2D interference verification part 42 calculates the crossing areas of respective outside shapes of respective components in respective projected faces. When the crossing areas calculated by the verification part 42 exist in all the projected faces, an interference area solidification verification part 43 prepares a cylindrical solid by scanning each crossing area vertically to a projected face corresponding to the crossing area, calculates the product set of all cylindrical solids, and when the produce set is not an empty set, judges the existence of interference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference component detection apparatus and method for detecting the presence or absence of interference between components in two-dimensional CAD.

[0002]

2. Description of the Related Art In recent years, in products such as information equipment, new products have appeared one after another in a form that meets the needs of consumers, and the period thereof tends to be shortened. To cope with this situation, it is necessary to shorten the period from design to prototyping, manufacturing, and shipping. However, since many of the defects in the design stage are found by trial production, rework of redesign is required. Various measures have been taken to reduce this rework. As one of the measures, there is an interference check for detecting interference between components before performing a trial production.

FIG. 8 is a block diagram showing an example of a conventional interference component detecting device. This device detects interference between components in two-dimensional CAD, and includes an input device 60 for inputting a component shape, a processing command, and the like, a display device 70 for displaying an input result echo and a processing result, and a component. It has a storage unit 80 for storing individual shape data, material thickness data, and the like, and a processing device 90. Then, the processing device 90 extracts a component combination to be subjected to interference verification based on the shape data stored in the storage unit 80 by the interference verification pre-processing unit 91, and excludes a combination that does not interfere. Next, the sheet thickness shape processing unit 92 performs verification of an overlapping area in consideration of a shape specific to the sheet metal part, and determines an area where interference occurs.
Next, the interference area is displayed on the display device 70 in the form of a diagram by the result display unit 93.

As described above, the conventional interference component detecting device is
At the stage of the interference verification pre-processing section 91, interference verification with rough accuracy is performed by a rough shape.
At this stage, the intersection area of the parallel line segment is detected by using the feature that the parallel line segment indicating the sheet thickness always appears in the three drawings in the sheet metal part, and the accuracy is determined by whether or not the intersection area exists on the three surfaces. A detailed interference verification was carried out. That is, the detection accuracy is increased by performing two-stage interference verification on the sheet metal part.

[0005]

However, the above-described interference component detection apparatus has a drawback that even if it is possible to perform interference verification specialized for sheet metal components, it is not possible to determine interference accurately with other components. Was. In addition, since verification is performed under rough determination conditions, there is a disadvantage that excessive determination that non-interfering components are interfering is extremely increased.

The present invention solves the above-mentioned drawbacks of the prior art, and enables an interference part detection apparatus and an interference part in a two-dimensional CAD capable of performing high-accuracy interference verification on general parts other than sheet metal parts. It is intended to provide a detection method.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides two-dimensional interference for calculating, for each of a plurality of projection planes, an intersection area where the external shapes of the components intersect each other on each projection plane. When the intersection area calculated by the verification means and the two-dimensional interference verification means is present on all projection planes, each intersection area is scanned perpendicularly to the projection plane to create a columnar solid,
Next, there is provided an interference area three-dimensionalization verification means for calculating a three-dimensional body formed by all of the columnar three-dimensional bodies crossing each other.

Further, the present invention provides an interference verification pre-processing means for calculating, for each of a plurality of projection planes, an overlapping area in which the rectangular area of each component overlaps on each projection plane, and an overlapping area calculated by the interference verification pre-processing means. Is present on all projection planes, a two-dimensional interference verification unit that calculates an intersection area where the external shapes of the components intersect each other on each projection plane,
When the intersection area calculated by the dimensional interference verification means exists on all projection planes, each intersection area is scanned perpendicular to the projection plane to create a columnar solid, and then formed by all of the columnar solids intersecting. And an interference region three-dimensionalization verification unit that calculates a three-dimensional object.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an interference component detecting apparatus in two-dimensional CAD according to the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, an overlapping area where the rectangular area of each component overlaps is calculated for each projection plane to determine the possibility of interference between the components. The intersection area of the external shape of the component is calculated for each projection plane to create a columnar solid, and the intersection of the columnar solids is calculated to verify the presence or absence of interference between the components.

FIG. 1 is a block diagram showing an interference component detecting apparatus according to this embodiment. In FIG. 1, an input device 10 is a device for inputting shape data of a part, a processing command, and the like, and a display device.
Reference numeral 20 denotes a device for displaying an echo of an input result and a processing result, and a storage unit 30 is a memory for storing shape data and property information of each component, all of which are connected to the processing device 40. The processing device 40 controls the input device 10, the display device 20, and the storage unit 30 to execute a predetermined process,
An interference verification pre-processing unit 41 that calculates a region where the rectangular region of each component overlaps for each projection plane to determine the possibility of interference, and a two-dimensional calculation that calculates the intersection area of the external shape of each component for each projection plane An interference verification unit 42 and an interference region three-dimensionalization verification unit 43 that creates a columnar solid corresponding to the intersection region in each projection plane, calculates the intersection of the columnar solids, and verifies whether or not there is interference between components.
And a result display unit for displaying the verification result on the display device 30
44 and.

Next, the operation of this embodiment will be described with reference to FIGS. 2 to 7. FIG. Here, FIG. 2 is a flowchart showing the operation of the present embodiment, which is executed by the processing device 40. In particular, the processing in steps S202 to S205
The processing of steps S206 to S208 is performed by the two-dimensional interference verification unit 42 by the 40 interference verification preprocessing unit 41, and the processing of steps S209 to S212 is performed by the two-dimensional interference verification unit 42.
Is performed by the interference area three-dimensionalization verification unit 43 in step S213.
Steps S214 to S214 are executed by the result display unit 44, respectively. FIG. 3 is a schematic perspective view showing an example of a component combination to be subjected to interference verification. FIG. 4 is a three-view drawing of a component combination, FIG. 5 is an explanatory diagram of an interference verification pre-process, and FIG.
Is an explanatory diagram of two-dimensional interference verification, and FIG. 7 is an explanatory diagram of three-dimensional interference region verification.

In FIG. 2, in the first step S201,
It is determined whether or not there is a component combination to be subjected to interference verification, and if there is, the process proceeds to interference verification pre-processing of steps S202 to S205. In the present embodiment, a part combination (C) 50 in which the parts (A) 51 and the parts (B) 52 having the shapes shown in FIG. 3 are combined in the state shown in FIG. 3 is subjected to interference verification.
The shape of the component to be subjected to interference verification may be arbitrary,
Not only a straight line but also a curve may be included.

In the interference verification pre-processing, the interference verification is performed by a relatively simple method. First, in step S202, the part shape data of the part (A) and the part (B) necessary for the interference verification are read from the storage unit 30 in which the shape data of each part is stored.

In step S203, the shape of each component on each projection plane of the three views is specified based on the component shape data. FIG. 4 is a three side view of the part (A) and the part (B).
(a) is a front view, (b) is a plan view, and (c) is a right side view.
Next, a rectangular area occupied by the component (A) and the component (B) on each projection plane is calculated. Here, the rectangular area refers to the smallest one of the rectangles satisfying the condition that no graphic element of the component exists outside the area. Specifically, the rectangular area is calculated by calculating the maximum and minimum coordinate values of the shape element of the component on the projection plane, and obtaining a rectangle having a line connecting them as a diagonal line. _{A 1 ~a 3, b 1 ~b} 3 in FIG. 5 shows a rectangular area calculated in this way, a ₁ ~a ₃ is a rectangular region of the part (A), b ₁ ~b ₃ is a rectangular area of the component (B).

[0016] In step S204, a rectangular region of the rectangular region of the calculated component _{(A) (a 1, a} 2, a 3) and component _{(B) (b 1, b} 2, b 3) overlap in step S203 The overlapping area is calculated for each projection plane. C ₁ to c in FIG. ₃ shows the overlapping regions of each projection plane calculated in step S204.

In step S205, it is determined whether or not the overlap area calculated in step S204 exists on all projection planes. If the overlapping area exists on all the projection planes, it is determined that there is a possibility that the component (A) and the component (B) may interfere with each other, and the process shifts to two-dimensional interference verification in steps S206 to S208. However, the projection plane where there is no overlapping area is 1
If there is at least one, it is determined that there is no possibility that the component (A) and the component (B) will interfere with each other, and the process returns to step S201.
The interference verification is executed for the next component combination. Thus, when there is no possibility of interference, the subsequent processing can be omitted, and the processing can be speeded up.
In the case of the component combination (C), as shown in FIG. 5, since there is an overlapping area (c ₁ , c ₁ , c ₃ ) on all projection planes, it is determined that there is a possibility of interference, and Step S2
The two-dimensional interference verification from 06 to S208 is executed.

In the two-dimensional interference verification, the possibility of interference between the component (A) and the component (B) is verified with higher accuracy than in the case of the interference verification preprocessing. First, in step S206, an outer shape loop of the component (A) and the component (B) on each projection plane is searched based on the component shape data, and the outer shape is extracted. Here, the outer shape loop refers to the smallest closed loop that satisfies the condition that no graphic element of a part exists outside the region, and it does not matter whether the closed loop is a straight line or a curve. _{D 1 ~d 3, e 1 ~e} 3 in FIG. 6, step
S206 shows the extracted contour shape, d ₁ to d ₃ is part
(A), and e _{1 to} e ₃ are the external shapes of the component (B).

In step S207, an intersection area where the external shape of the component (A) and the external shape of the component (B) intersect on each projection plane is calculated based on the external shape extracted in step S206. F ₁ ~f ₃ in FIG. 6, part calculated in step S207
The crossing region of the outer shape of (A) and the outer shape of component (B) is shown.

In step S208, it is determined whether or not the intersection area of the outer shape calculated in step S207 exists on all projection planes. If the intersection area exists on all the projection planes, the process proceeds to the interference area three-dimensional verification in steps S209 to S213. However, if there is at least one projection plane where there is no intersection area, it is determined that there is no possibility that the component (A) and the component (B) will interfere with each other, and the process returns to step S201 to return to the next component combination. And perform interference verification. In the case of the component combination (C), as shown in FIG. 6, since the intersection areas (f ₁ , f ₂ , f ₃ ) exist on all the projection planes, the three-dimensional interference area in the next steps S209 to S212 is used. Verification will be performed.

In the three-dimensional interference area verification, it is verified whether or not the three-dimensional area can be formed in the intersection area between the component (A) and the component (B) on each projection plane calculated in step S207, and it is determined whether or not there is interference. Is finally determined. First, in step S209, a reference coordinate system is set for each projection plane, and the intersection area is swept in a direction perpendicular to the projection plane on which the intersection area exists to create a columnar solid for each projection plane. For example, in FIG. 7, f ₁ , f ₂ ,
By sweeping the intersection area indicated by f ₃ in the direction perpendicular to the projection plane where each intersection area exists, g ₁ , g ₂ ,
To create a columnar solid shown by g _3.

[0022] At step S210, it calculates the intersection by all columnar stereoscopic created _{(g 1, g 2, g} 3) at step S209. This intersection can be calculated by, for example, a known Boolean operation (Boolean operation).

In step S211, it is determined whether the product set calculated in step S210 is an empty set. If the intersection is not an empty set, a solid having a volume exists, so that it is determined that the parts (A) and (B) interfere with each other (step S212), and the results of steps S213 to S214 are determined. Move on to display execution. However, if the intersection is an empty set, there is no solid having a volume, so it is determined that the component (A) and the component (B) do not interfere with each other (step S213), and the first step S201 Returning to the processing, the interference verification is executed for the next component combination. In the case of the component combination (C), as shown in FIG.
Is a solid body with a volume, not an empty set.
(A) and part (B) are determined to interfere, and the next step S214
The result display of S215 is executed.

In the result display, first, in step S214, a three-view drawing is created by projecting the solid V of the intersection set calculated in step S210 on each projection plane. Next, in step S215, the three-view drawing created in step S214 is
Is displayed by the display device 20 of FIG. A perspective view of the solid V may be displayed. Thereby, the part (A) shown in FIG.
The component interference in the component combination (C) including the component (B) and the component (B) can be visually confirmed. The display device 20 may display the results of the pre-interference verification processing and the two-dimensional interference verification.

As described above, according to this embodiment, the intersection area of the external shape of the component is calculated for each projection plane of the three-view drawing to create a columnar solid, and the intersection of all the columnar solids is set as a Boolean. Since the interference between parts is determined by calculating and verifying that the intersection is not an empty set, high-precision interference verification must be performed on general parts other than sheet metal parts. Becomes possible.

In this embodiment, an overlapping area where the rectangular areas of each component overlap each other, and an intersection area of the outer shape are calculated for each projection plane of the three views, and a product set is calculated by a Boolean operation to verify interference. However, the present embodiment can be applied to a component expressed by only two surfaces. For example, in the case of a simple shaft or the like, the shape is often expressed by only two surfaces. In such a case, the overlapping region of the rectangular regions of each component and the intersection region of the outer shape may be calculated using only two surfaces (projection surfaces), and the intersection set may be calculated by the Boolean operation. If there are two or more common projection planes, it is possible to calculate the interference area by Boolean operation.

When verifying interference between a component represented by a three-view drawing and a component represented by only two surfaces, interference verification may be performed only on a common projection plane. For example,
Parts represented in three views: front, side, and top;
When verifying interference between components represented only by the front and side surfaces, a predetermined process is performed on the front and side surfaces common to both components.

Further, in this embodiment, the static interference between the parts is verified. However, during the movement of the parts, the shape after the movement is separately registered and the time step is verified.
It is also applicable to dynamic interference verification.

[0029]

As described above, according to the present invention, an intersection area of the external shape of each part is calculated for each projection plane to create a columnar solid, and a solid formed by all the columnar solids intersecting with each other. Is calculated, the interference between the components is verified, so that it is possible to perform high-precision interference verification on general components other than sheet metal components. Further, since the presence or absence of the interference area is verified step by step with respect to an enormous number of component combinations, it is possible to greatly reduce the calculation time. As a result, design errors due to interference between components found in the prototype stage can be verified in the design stage in advance, so that significant design time reduction and cost reduction effects can be expected.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an interference component detection device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the interference component detection device in the present embodiment.

FIG. 3 is a schematic perspective view showing a combination of components to be subjected to interference verification in the embodiment.

FIG. 4 is a three-view drawing of the component combination shown in FIG. 3;

FIG. 5 is an explanatory diagram of an interference verification pre-process in the embodiment.

FIG. 6 is an explanatory diagram of two-dimensional interference verification in the present embodiment.

FIG. 7 is an explanatory diagram of three-dimensional interference region verification in the present embodiment.

FIG. 8 is a configuration diagram of a conventional interference component detection device.

[Explanation of symbols]

 10 Input device 20 Display device 30 Storage unit 40 Processing unit 41 Pre-processing unit for interference verification 42 Two-dimensional interference verification unit 43 Three-dimensional interference region verification unit 44 Result display unit

Claims (6)

[Claims] An intersection area where the external shape of each component intersects each other on each projection plane is calculated for each of a plurality of projection planes.
When the intersection area calculated by the two-dimensional interference verification means is present on all projection planes, each intersection area is scanned perpendicularly to the projection plane to create a columnar solid, and then the columnar solid An interference part detection apparatus in two-dimensional CAD, comprising: an interference area three-dimensionalization verification unit that calculates a three-dimensional object formed by all intersections. 2. An interference verification pre-processing means for calculating, for each of a plurality of projection planes, an overlapping area where a rectangular area of each component overlaps on each projection plane; Two-dimensional interference verification means for calculating an intersection area where the external shapes of the components intersect each other on each projection plane, and the intersection area calculated by the two-dimensional interference verification means exists on all projection planes When the intersection area is scanned perpendicular to the projection plane to create a columnar solid, and then, an interference area three-dimensionalization verification unit that calculates a solid formed by intersecting all of the columnar solids is provided. An interference component detection device in two-dimensional CAD. 3. The apparatus according to claim 1, wherein the three-dimensional interference region verification unit obtains the solid by calculating a product set of all the columnar solids by a Boolean operation. An interference component detection device in two-dimensional CAD. 4. The two-dimensional CAD according to claim 1, further comprising display means for displaying a three-dimensional shape calculated by the interference area three-dimensionalization verification means. Interference part detection device. 5. A step of calculating, for each of a plurality of projection planes, an intersection area where the external shapes of the components intersect with each other on each projection plane, and when the intersection area calculated by the step exists on all projection planes, Scanning each intersection area perpendicular to the projection plane to form a columnar solid, and then calculating a solid formed by intersecting all of the columnar solids. Component detection method. 6. A step of calculating, for each of a plurality of projection planes, an overlapping area in which a rectangular area of each component overlaps on each of the projection planes. Calculating a crossing area where the external shapes of the parts intersect with each other on the plane; and when the crossing area calculated in the step exists on all projection planes, scan each crossing area perpendicular to the projection plane to form a columnar shape. A method for detecting an interference part in two-dimensional CAD, comprising the steps of creating a solid, and then calculating a solid formed by intersecting all of the columnar solids.