JPH07230482A - Plotting method for cad drawing - Google Patents

Abstract

PURPOSE:To provide the CAD drawing generation method which shortens the time required for plotting of a similar drawing and reduces misgeneration of a simple drawing. CONSTITUTION:A general CAD system is used to store a reference point 01 of a fundamental graphic, the scare, and start point coordinates, lengths, and directions of segments 11, 12,..., 33 based on this point. Constant values like scaleddown dimensions are stored besides variable symbols (H, W, L, etc.,) as dimensions of this graphic. Apart where segments should be changed is selectively inputted. Segments of the change part are flashed on the display by this input. Actual dimensions corresponding to the change are inputted. Pertinent segments are changed to inputted new dimensions, and the graphic is changed in accordance with vector correspondence on drawing coordinates to lengths, coordinate positions, angles, etc., or segments having connection relations to pertinent segments. This calculation is executed for all of segments having the connection relations in of the graphic before the change. Thus, connection relations contour segments or the graphic before the change are kept even after the change.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing method by a CAD system.

[0002]

2. Description of the Related Art Conventionally, in drawing using a CAD system, a designer or a CAD operator directly inputs line segment data for drawing. This data input is generally performed by designating a specific line (two-dimensional) on the display screen and by key-inputting so-called vector values such as the direction and length of the line to be newly drawn. In addition, after copying the data of other drawings, drawing is also performed by processing or correction of the dimension-related data.

Japanese Patent Application No. 2-153085, entitled "Method for Creating Stereoscopic Diagram," is a conventional example of drawing. According to this example, by designating a specific line displayed on the screen when drawing a line segment and by keying in the direction and length of the line segment,
A line segment with a predetermined length parallel to a specific line is drawn.

[0004]

[Problems to be Solved by the Invention] However, in the past,
In many cases, a large number of parts having different dimensions are designed even though the variation designs of the parts, that is, the outer shapes are almost similar. In this case, it is necessary to create the number of drawings corresponding to the number of parts. The designer draws a line segment on the CAD for each part type on the CAD, and is forced to perform overlapping similar operations.

When the copy data of another drawing is partially corrected and a new drawing is created, even if the dimensions of a line segment corresponding to one component is simply corrected, the component having a connection relationship with this component can be dealt with. It is necessary to change the position of the line segment on the drawing. When the respective parts have a structural connection relationship, it is general that the change of the dimension of one part is not limited to the change of the corresponding part in the drawing. The above need arises in an intermediate part drawing, an assembly drawing, and the like composed of a plurality of parts.

[0006] In the conventional change of a figure, for example, in the case of changing one line segment, a line segment connected to the line segment is changed to the line segment in relation to the change of the line segment. The first line segment having a direct connection relationship, the second line segment having a connection relationship with the first line segment, the third order, the fourth order, ... Forced to change.

Alternatively, when the reduction / enlargement mode is used,
Since the degree of contraction is changed as a whole, it is difficult to change the scale partially, and the parts, that is, the number of lines, accompanying the scale change is manually changed based on a predetermined standard.

In such a monotonous work, there is a problem that it takes a lot of man-hours, the work efficiency is poor, and a drawing error easily occurs.

It is an object of the present invention to provide a method for creating a CAD drawing which can reduce the time required for drawing a similar drawing and reduce mistakes in creating a simple drawing.

[0010]

In order to achieve the above object, a method for drawing a CAD drawing according to the present invention provides a method for connecting a starting point coordinate of a contour line segment in a predetermined direction forming a figure, a vector index, and the contour line segment. The starting point coordinates of the other contour line segment having a relation, a basic figure data storing step of storing the vector index, and a dimension input step of inputting a new dimension value of the contour line segment in a predetermined direction, It is characterized in that the size of the outline line segment is automatically changed based on the size value in the dimension input step and the connection relationship with other outline line segments is maintained.

The starting point coordinates and the vector index are for two-dimensional or three-dimensional, and the drawing method of the CAD drawing further includes a scale size input step for inputting a scale size value, and the scale value and scale size value are input. Based on this, it is preferable to automatically change the shape of the outline of the figure.

Further, the CAD drawing method has a change line segment selecting step of arbitrarily selecting and setting a predetermined line segment corresponding to the new dimension value input in the dimension input step. The shape of the outline of the figure may be automatically changed by changing the selected and set line segment based on the dimension value.

The above CAD drawing method further includes a coordinate range designating step, and if the contour line segment can be changed within the range designated in the coordinate range designating step based on the dimension value, the function is further improved. .

[0014]

Therefore, according to the CAD drawing method of the present invention, the starting point coordinates of the line segment of the contour forming the figure, the vector index, and the starting point coordinate of another contour line segment having a connection relationship with the contour line segment, Memorize the vector index and enter a new dimension value for the contour line segment in the specified direction, and maintain the connection relationship with other contour line segments, and enter the dimension value for the relevant contour line segment. Change automatically based on Therefore, it becomes possible to maintain the connection relationship between the structural parts only by modifying / changing some of the parts.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A CAD according to the present invention will now be described with reference to the accompanying drawings.
An embodiment of a drawing method will be described in detail. FIG. 1 shows the configuration of a CAD system for creating a component drawing of the embodiment,
2 is a part for explaining the first embodiment, and FIG. 3 is a second part.
FIGS. 4 to 7 show application examples for explaining the embodiment of FIG. (First Embodiment) The CAD system shown in FIG. 1 used in this embodiment includes an input unit 1 such as a keyboard and a mouse, a processing unit 2, a basic figure data storage unit 3 which is a memory unit such as a hard disk, a CRT, and the like. The display device 4 is a display. When the processing device 2 is further disassembled, it is composed of an input data recognition unit 5, a drawing data calculation unit 6, and a display drawing data generation unit 7, and parts such as an I / O unit and a power supply unit naturally attached to the device are not shown. is doing.

FIG. 2 shows an example of a three-dimensional graphic stored in the basic graphic data storage unit 3 as display drawing data. In the display of the figure, the left-right direction is the X-axis (right direction is positive), the up-down direction is Y-axis (upward is positive), the front-back direction is Z-axis (forward direction is positive).
The perspective view is provided to facilitate understanding.

The outline of this figure has line segments 11, 12 and 13 parallel to the X-axis direction and line segments 21 and 2 parallel to the Y-axis direction.
2 and 23, and line segments 31, 32 and 33 parallel to the Z-axis direction. Further, each symbol in the drawing represents H / height, W / width, L / depth.

When the component drawing example shown in FIG. 2 is applied to the CAD system of FIG. 1, first, a reference point 01 used in the graphic display in the basic graphic data storage unit 3, a scale and a line segment 11 based on that point are used as a reference. The starting point coordinates, length, and direction of each of 12, ..., 33 are stored. In addition to the variable symbols (H, W, L, etc. above), constant values are stored as the dimensions of this figure.

When drawing a CAD drawing, the portion to be drawn is selected and input from the input unit 1. Then, the input data of the processing device 2 passes through the recognition unit 5 and the basic graphic data of the corresponding portion is read from the basic graphic data storage unit 3 and stored in the drawing data calculation unit 6. The operator inputs, via the input unit 1, an instruction to input actual dimensions for the height dimension H, width dimension W, and depth dimension L required for drawing.
The input data recognition unit 5 recognizes this instruction input, and the drawing data calculation unit 6 receives this recognition signal and outputs a command signal for identification display. The display screen data generation unit 7 receives the command signal for identification display, and makes the display on the display device 4 visible so that it can be identified by the operator.

The identifiable state is, for example, a change in display color or flash display. "Width" in Figure 2
When is designated, the display symbol W is displayed in flash.
In this form of visible display, the designated symbol W and / or the line segments 11, 12, and 13 may also be identified and displayed. In still another form, selection of a corresponding line segment, for example, a line segment that does not want to be changed in the line segment displayed in the flash is clipped with the mouse and excluded from the changed line segment. On the contrary, the line segment of the static display is changed to the flash display by the same procedure and added to the changed line segment.

When the actual dimensions and scale corresponding to a new part are input from the input unit 1, the drawing data calculation unit 6 calculates drawing data based on the information obtained by the input data recognition unit 5. In this calculation, the new input line segment is changed based on the input data. With this change, the connection relation on the drawing coordinates such as the length, coordinate position, and angle of the line segment having the connection relation with the line segment is held.

That is, when FIG. 2 is assumed to be a hollow box body assembled from six plates, there is no change in the structure of the box body whose outer periphery is covered by the plates due to the holding of this connection relationship. Therefore, the scale of the line segment other than the line segment corresponding to the above change is not changed. Before and after the change, the connection relation of the outline line segment of the figure before the change is retained even after the change, and the contraction degree of the basic figure is also retained.

Further, display drawing data to be displayed in a CAD drawing of a new figure is generated by the display drawing data generating section 7,
It is displayed on the display device 4.

A new drawing is created based on the above procedure. The above-mentioned dimension change or new dimension input is executed a plurality of times in one drawing as necessary. Basically, dimensions are entered for each display symbol, and W is used for complicated components.
, W2, ..., Wi, etc. are used.

One part is stored in the memory as basic graphic data. The memory items are origin coordinates and scales used as a reference for drawing a three-dimensional diagram, and also start point coordinates, length, and direction of each line segment that constitutes the three-dimensional diagram. When creating a CAD drawing, enter the length for each line segment (although it is "re-entry" because the original data is already stored in memory)
It can be so.

From the results of the above two points, the contour image (combination of line segments) is drawn on the display while the dimensions in the drawing are multiplied by the scale without changing.

The creation of graphics, that is, the combination of line segments during drawing is freed from the task of drawing on the display.
Therefore, the drawing time can be shortened.

In the case where the outlines are almost similar, but the drawing has to be made for each part, it is complicated in drawing, that is, one line is drawn on the CAD drawing to make one drawing. It is not necessary to draw, and it is possible to draw an accurate drawing for the relevant part if only the differences in dimensional conditions in design variations are understood.

It is also possible to eliminate mistakes that occur when drawing with human hands, that is, mistakes concerning the fitting of component parts and dimensioning. (Second Embodiment) The second embodiment is a case of a two-dimensional drawing, whereas the first embodiment is a drawing automation in a three-dimensional drawing. The CAD system used in this embodiment is the system of FIG. 1 used in the first embodiment described above, and a duplicate description of the CAD system will be omitted.

FIG. 3 shows an example of a graphic stored in the basic graphic data storage unit 3 as display drawing data in the second embodiment. This figure includes an upper frame 51, a lower frame 52, and a vertical frame 6.
1 is a plan view showing an assembled part composed of a total of five parts such as 1, 62, 63, and the height is H,
Width W and plate thickness dimensions h1, h2, w1, w of each component
2, w3. The upper frame 51, the lower frame 52, and the vertical frames 61 and 63 are fixed at their respective ends, and the vertical frame 62 is fixed to the central portions of the upper frame 51 and the lower frame 52.

When the example of the parts shown in FIG. 3 is applied to the system of FIG. 1, it becomes as follows. First, in the basic graphic data storage unit 3, a reference point 01 used for graphic display, a scale and an upper frame 51, a lower frame 52 and vertical frames 61 and 6 based on the scale are used as a reference.
The starting point coordinates, length, and direction of each of the line segments that form 2, 63 are stored. Further, as the dimensions of this figure, a constant value is stored in addition to the variable symbol of height H and width W.

In drawing a CAD drawing, the input unit 1 selects and inputs the part to be drawn. Then, the input data of the processing device 2 is passed through the recognition unit 5 to read the basic graphic data of the relevant part from the basic graphic data storage unit 3 and stored in the drawing data calculation unit 6. The input data recognition unit 5 recognizes an instruction to input the actual dimensions of the height dimension H and the width dimension W required for drawing, and displays them on the display device 4.

When the actual size and scale are input to the input unit 1, the drawing data calculation unit 6 calculates drawing data based on the information obtained by the input data recognition unit 5. Further, the display drawing data generation unit 7 generates new display drawing data to be displayed on the display device 4, and outputs it to the display device 4.

In the above changing procedure, for example, the width dimension W
When changing, the changed parts are the left and right lengths of the upper frame 51 and the lower frame 52 shown in FIG. The length is changed with reference to the vertical position on the reference point 01 (position on the Y axis), and the size of the right side (on the X axis) of the upper frame 51 and the lower frame 52 is changed. As the dimensions of the upper frame 51 and the lower frame 52 are changed, the positions of the vertical frames 62 and 63 on the coordinates change, and the connection relationship with the upper frame 51 and the lower frame 52, that is, the upper frame 51 in FIG.
And the connection positional relationship between the lower frame 52 and the vertical frames 62 and 63 is maintained. The center position of the vertical frame 62 with respect to the upper frame 51 and the lower frame 52 is maintained. The position of the vertical frame 61 where the outline matches the vertical position on the reference point 01 (position on the Y axis) does not change. In addition, each component 51, 52, 61, 62, 6
No change occurs in the plate thickness dimensions h1, h2, w1, w2, w3 of No. 3.

The present invention enables drawing by the designer inputting the types of dimensions (nominal dimensions) known in the variation design. The purpose of this is to reduce the time required for drawing and to eliminate simple drawing mistakes. (Application Example) FIGS. 4 to 7 show a case where the drawing of the outer wall panel, which is one component used as a building material, is applied to the present invention.

This outer wall panel is composed of a horizontal frame 71, a vertical frame 81 and a face material 91. Figure 4-
In FIG. 7, each drawing (A) shows the structure of the outer wall panel 3
It is a three-dimensional perspective view, and each drawing (B) is 2 on CAD.
It shows a form in which a front view and a side view of a dimension are drawn. 4 to 6 of these figures show the case where the configuration is the same and some of the dimensions are different, and FIG. 7 shows the case where the number of horizontal frames 71 is different.

In the drawing method of these drawings, FIG.
Drawing (B) of outer wall panel of width A1 and height H1 of (A)
Is drawn by the conventional procedure. Along with drawing, the graphic data of this part, the reduced size, the starting point coordinates of each line segment, the length, and the direction are stored in the basic figure data storage unit.

In the drawing of FIG. 5B, the processing device 2 reads out the drawing data of FIG. 4B from the basic graphic data storage unit 3 and displays it on the display device 4. The operator operates the input unit 1
Input a command to change the size of the height H1. The processing device 2 receives this command input, and all the line segments representing the vertical frame 81 of the display diagram of the display device 4 are flash-displayed. The operator looks at this flash display and confirms whether or not the line segment is desired to be changed. If there is an excess or deficiency, enter the change / correction command.

Input a new height H2 dimension. The processing device 2 changes the display form of the drawing to FIG. 5B based on the input size of the new height H2. After confirming the changed drawing, the operator records or stores the changed data as a new drawing corresponding to FIG.

FIG. 6 shows a case where the dimensions of the horizontal frame 71 are different, and the procedure for creating this figure is the same as that in the case of FIG.

FIG. 7 shows a case where the configuration is different, and the width W3 and height H3 dimensions are changed in the same procedure as in FIGS. 5 and 6. Width W3 dimension and height H3 dimension and horizontal frame 71
The relationship of the number of constituents is determined mainly by the structural mechanical relationship between the horizontal frame 71 and the vertical frame 81. The relationship between these basic configuration conditions, that is, the respective values of the width W3 and height H3 dimensions and the number of horizontal frames 71 is registered in advance.

Along with the change in the dimension, the number of horizontal frames 71 is automatically changed so as to meet the pre-registered conditions. With the above configuration, the width W3 and the height H3
Since the size exceeds the predetermined value, one horizontal frame 71 is automatically increased to two.

Further, if the change can be made only in the portion in the drawing, for example, in the portion or area of the line segment continuously described, the function of the variation drawing is further expanded.
This function will be described in more detail with reference to FIG. 3 used in the second embodiment. In the frame diagram of FIG. 3, a predetermined area is designated by a key input or a mouse. For example, when the area 100 shown by the chain double-dashed line in FIG. 3 is designated and a predetermined new scale is input, only the designated areas of the upper frame 51 and the lower frame 52 are scaled down. By this operation, the interval between the vertical frames 61 and 62 is changed and the interval between the vertical frames 62 and 63 is not changed. In addition, the position of the vertical frame 61 does not move due to the partial length dimension of the upper frame 51 and the lower frame 52, as in the case of the second embodiment,
The vertical frames 62 and 63 move. The connection positional relationship between the upper frame 51 and the lower frame 52 is maintained.

The maintenance of the connection position relationship in the above-mentioned partial modification is the same as in the case of the second embodiment, and each component 5
Plate thickness dimensions h1, h2, w of 1, 52, 61, 62, 63
No change occurs in 1, w2 and w3. The change of the plate thickness dimension can be performed by including the drawing portion of the plate thickness in the change region.

The above procedure makes it possible to easily draw a component drawing having various variations.

The above-described embodiment is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the change of the parts having different configurations in FIG. 7 is not limited to the increase and decrease of the constituent parts. It is also possible to automatically change the predetermined standard corresponding to the size and the form of the size vs. configuration.

[0047]

As is apparent from the above description, claim 1
In the method for drawing a CAD drawing according to the present invention, it is possible to automatically change the shape of the outline of the figure by changing the length of the line segment from the coordinates of the starting point based on the new dimension value of the predetermined line segment. ,
It becomes easy to create a new figure that maintains the connection relationship between parts. As a result, it is possible to reduce the number of man-hours for creating the drawing and the number of mistakes.

Further, in the invention of claim 2, since the starting point coordinates and the vector index are for two-dimensional or three-dimensional, the application range of the invention of claim 1 can be expanded and used.

According to the third aspect of the present invention, since the scale dimension value is further input and the shape of the outline of the figure is automatically changed based on the dimension value and the scale dimension value, the flexibility of drawing is increased. .

Further, in the invention of claim 4, a predetermined line segment corresponding to the new dimension value input in the dimension input step is arbitrarily selected and set, and the selected and set line segment is changed based on the dimension value. Thus, since the shape of the outline of the figure is automatically changed, the change of the figure can be diversified.

According to the fifth aspect of the present invention, the coordinate range is further specified, and the contour line segment can be changed within the specified range based on the dimension value. Therefore, the function is further improved and the change of the figure can be diversified.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a CAD system applied to implementation of a CAD drawing drawing method of the present invention.

FIG. 2 is an example diagram for explaining a first embodiment of a CAD drawing drawing method of the present invention.

FIG. 3 is an example diagram for explaining a second embodiment of a CAD drawing drawing method of the present invention.

FIG. 4 is an example diagram for explaining the second embodiment in a more specific manner, in which (A) is a perspective view showing the form of a component to be drawn, and (B) is a drawing example.

5A and 5B are an example diagram for more specifically explaining the second embodiment, in which FIG. 5A is a perspective view showing a form of a component to be drawn, and FIG. 5B is a drawing example.

FIG. 6 is an example diagram for more concretely explaining the second embodiment, in which (A) is a perspective view showing a form of a component to be drawn, and (B) is a drawing example.

FIG. 7 is an example diagram for more concretely explaining the second embodiment, in which (A) is a perspective view showing a form of a component to be drawn, and (B) is a drawing example.

[Explanation of symbols]

 1 input unit, 2 processing device, 3 basic figure data storage unit, 4 display device, 01 reference point, 11, 12, 13 line segment parallel to X-axis direction, 21, 22, 23 line segment parallel to Y-axis direction , 31, 32, 33 Lines parallel to the Z-axis direction.

Claims (5)

[Claims] 1. A basic figure that stores starting point coordinates and a vector index of a contour line segment in a predetermined direction that configures a figure, and starting point coordinates and a vector index of another contour line segment that is connected to the contour line segment. A data storage step and a dimension input step of inputting a new dimension value in the contour line segment in the predetermined direction are performed, and the dimension of the contour line segment is automatically calculated based on the dimension value by the dimension input step. And a connection relationship with the other contour line segment is maintained. 2. The method of drawing a CAD drawing according to claim 1, wherein the starting point coordinates and the vector index are for two-dimensional or three-dimensional. 3. The CAD drawing method further includes a scale size input step of inputting a scale size value, and based on the size value and the scale size value, only the size of the outer line segment in the predetermined direction is calculated. The automatic change is performed according to claim 1.
Alternatively, the CAD drawing method described in 2. 4. The CAD drawing method further includes a change line segment selection step of arbitrarily selecting and setting an outline line segment in the predetermined direction to which the new dimension value input in the dimension input step corresponds. The outline form of the graphic is automatically changed by changing the outline line segment selected and set in the changed line segment selection step based on the dimension value. CAD according to any one of claims
Drawing method. 5. The CAD drawing method further comprises a coordinate range designating step, wherein the contour line segment is changed within the range designated in the coordinate range designating step based on the dimension value. C according to any one of claims 1 to 4.
AD drawing method.