JPH0434193B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In an automatic dimension writing method for two-dimensional figures, figure information and attribute information are used as input information, a figure element to be dimensioned is extracted based on the attribute information, and dimensional accuracy corresponding to the attribute is determined. Select and create dimension entry data. Thereby, the dimension accuracy can be selected in accordance with the attributes of the graphic element to be dimensioned, and dimensions of a two-dimensional figure can be efficiently dimensioned.

[Industrial application field]

The present invention is an automatic dimensioning method for two-dimensional figures, and in particular, an improved automatic dimensioning method for two-dimensional figures that selects the number of effective digits of the dimension to be written in accordance with the attributes of the graphical element and is capable of entering necessary tolerances. Regarding the method.

[Conventional technology]

In order to efficiently create two-dimensional figures, CAD
(Computer-aided design).

In the field of creating two-dimensional figures using CAD, when writing dimensions for a figure, one by one write the desired figure elements such as line segments and arcs, and the position of the leader line for writing the dimensions. The operator was giving instructions. Furthermore, when entering dimension values, the operator inputs instructions regarding dimensional accuracy such as the number of effective digits and tolerances.

However, in fields such as mechanical design that require many similar drawings, this input method increases operation time and CAD terminal exclusive time, making it difficult to shorten the design period and reduce the man-hours required to create two-dimensional figures. There was an inconvenience in that it was not possible to proceed effectively.

Therefore, CAD systems have come to automatically enter the dimensions of two-dimensional figures.

FIG. 6 shows a parts diagram of a punch plate as an example of a two-dimensional figure with dimensions automatically created by such CAD. As can be seen from Fig. 6, the automatic dimensioning method for two-dimensional figures using conventional CAD systems has the following characteristics.

(a) The position of dimension entry and the number of significant digits of entry dimension are fixed. For example, in the case of Figure 6, each dimension is entered in the form of a leader line in the X direction and Y direction from point P as the reference point, and the number of significant digits of each entered dimension is determined by the attribute of the graphic element. Three digits (the number of digits after the decimal point, the same applies hereafter) are entered for each rate, regardless of the number. If the precision is 2 digits, 2 digits below the decimal point will be entered regardless of the attributes of the graphic element. Note that the attribute information is the attribute of a component of a two-dimensional figure such as a figure element, for example,
This is information that represents the meaning that a graphic element has in an actual part or product.

(b) Tolerances are not entered.

(c) Since the two-dimensional graphic information is only graphic shape information, dimensions are entered for all coordinate points that do not require dimension entry.

[Problem that the invention seeks to solve]

In the conventional automatic dimension entry method for two-dimensional figures, the accuracy of the entry dimensions is fixed, as described above. For this reason, in two-dimensional figures, although the dimensional accuracy generally varies depending on the attributes of the figure elements,
The problem was that we couldn't deal with it.

Furthermore, although there are few dimensions that require the entry of special tolerances, in the conventional method, tolerances cannot be automatically entered, so an operator has to instruct the operator to input them individually if necessary.

Furthermore, in the conventional method, dimensions were written uniformly at all the coordinate points of graphic elements, so it is necessary to deal with the fact that some graphic elements may or may not require dimensioning depending on their attributes. Because of the large number of dimensions and leader lines, processing efficiency deteriorated and drawings became difficult to read.

The present invention adds attribute information in addition to figure shape information to two-dimensional figure information, extracts a figure element to be dimensioned based on the attribute information, and selects the accuracy of the entered dimension according to the attribute of the figure element. It is an object of the present invention to provide an improved automatic dimension entry method for two-dimensional figures so that necessary tolerances can be entered.

[Means for solving problems]

The solution taken by the present invention will be explained with reference to FIG. FIG. 1 is a block diagram showing the basic configuration of the present invention.

In FIG. 1, reference numeral 11 denotes a figure shape information extracting means, which extracts figure shape information of each figure element to be dimensioned from the two-dimensional figure information based on the attribute information in the two-dimensional figure information. .

Reference numeral 12 denotes a dimensioning data creation means, which selects the dimensional accuracy of the graphical element corresponding to the attribute of the graphical element to be dimensioned, and based on this dimensional accuracy information and graphical shape information, creates dimension data for each dimensioning target. Create dimensioning data for graphic elements.

The dimensional accuracy information of the graphic element includes necessary tolerances in addition to the number of effective digits of the entered dimensions. Whether or not tolerances are included in the dimensional accuracy information is determined by the attributes of the graphic element.

Reference numeral 13 denotes a figure creation means, which creates a two-dimensional figure whose dimensions are entered in accordance with the dimension accuracy information corresponding to the attributes of each graphic element, based on the dimension entry data created by the dimension entry data creation means 12.

[Effect]

The figure shape information extraction means 11 extracts attribute information from the two-dimensional figure information, selects each figure element to be dimensioned based on the attribute information,
The graphic shape information is extracted from the two-dimensional graphic information.

The dimensioning data creation means 12 selects the dimensional accuracy information of the graphical element corresponding to the attribute of the graphical element to be dimensioned extracted by the graphical shape information extraction means 12. This selection process can be performed by, for example, providing a table storing dimensional accuracy information corresponding to the contents of each attribute in advance in the dimensional entry data creation means 12 and referring to the table.

The dimensioning data creation means 12 further creates dimensioning data for each graphical element to be dimensioned based on this dimensional accuracy information and the graphical shape information extracted by the graphical shape information extraction means 11.

The figure creation means 13 creates, based on the dimension entry data created by the dimension entry data creation means 12, a two-dimensional figure whose dimensions are entered in accordance with the dimensional accuracy information corresponding to the attributes of each graphic element.

By doing as described above, it is possible to select the precision of the dimensions to be written in accordance with the attributes of each graphic element of the two-dimensional figure, and also to write the necessary tolerances. Further, since dimensions are entered based on the attribute information of the two-dimensional figure, unnecessary dimension entries are not performed, and an easy-to-read two-dimensional figure can be efficiently created.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 2 to 5. FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIG. 3 is a processing flowchart of the embodiment.
FIG. 4 is an explanatory diagram of an attribute information table used in the same embodiment, and FIG. 5 is an explanatory diagram of an example of a two-dimensional figure created by the same embodiment.

(A) Configuration of the embodiment In FIG. 2, the figure shape information extraction means 1
1. The dimension entry data creation means 12 and the figure creation means 13 are as explained in FIG.

A graphic information storage device 14 stores two-dimensional graphic information, that is, graphic shape information and attribute information of two-dimensional figures.

In the figure shape information extraction means 11, 111
is an attribute information extraction unit that extracts unit attribute information from the two-dimensional graphic information. Reference numeral 112 denotes a dimensioning target extraction unit that extracts the attributes of the dimensioning target element, that is, the graphic element. A graphic shape information extraction unit 113 extracts graphic shape information of a graphic element having the extracted attribute from the two-dimensional graphic information.

In the dimension entry data creation means 12, 12
Reference numeral 1 denotes a dimensional accuracy selection section which selects the dimensional accuracy of the drawn dimension of a graphic element to be dimensioned by referring to a dimensional accuracy table 121a provided therein.

FIG. 4 shows an example of the dimensional accuracy table 121a. In the attribute column, the attributes (A, B, etc.) of the graphic element are entered, and examples of the contents are shown in parentheses. The dimensional accuracy column further includes a number of effective digits column and a tolerance column, in which the number of effective digits and tolerance of the entered dimension of a graphic element having the corresponding attribute are entered. Note that if no tolerance is entered in the tolerance column, a predefined tolerance corresponding to the number of effective digits will be used.

Reference numeral 122 denotes an axis-parallel line segment extracting unit which extracts line segments parallel to the X-ray or Y-axis from the graphical element to be dimensioned.

Reference numeral 123 denotes a graphic dimension information storage unit which stores end point information (start point and end point) of each extracted line segment and its dimensional accuracy information in a graphic information table 123a provided therein.

Reference numeral 124 denotes an X coordinate relocation unit that extracts the end points of each line segment and their dimensional accuracy information from the figure information table 123a, and arranges them in ascending (or descending) order of the X coordinate values.
The data is sorted into the X coordinate order table 124a and stored in the X coordinate order table 124a.

Reference numeral 125 denotes a Y coordinate relocation unit, which extracts the end points of each line segment and their dimensional accuracy information from the figure information table 123a, and arranges them in ascending (or descending order) of the Y coordinate values.
The data are sorted into the Y coordinate order table 125a.

Reference numeral 126 denotes a dimensioning data creation unit, which creates dimensioning data of the X and Y coordinate values of the graphical element to be dimensioned, and creates the dimensioning data table 12.
6a.

(B) Operation of the Embodiment The operation shown in FIG. 2 will be explained using the two-dimensional figure creation process shown in FIG. 5 as an example, and according to the steps of the processing flowchart shown in FIG. 3.

FIG. 5 shows a two-dimensional figure of a component mold as shown in the perspective view of FIG. 5A, FIG. 5B is a front view thereof, and FIG. 5C is a top view thereof.

The dimensional accuracy table shown in FIG. 4 shows an information table of attributes and dimensional accuracy regarding the two-dimensional figure shown in FIG. Attribute A indicates a graphical element that does not require dimensional accuracy (for example, a mold outline or a sunken part), and attribute B indicates a graphical element that requires high dimensional accuracy (for example, a fitting part of parts). Attribute C indicates that it is a graphic element that requires normal dimensional accuracy, and attribute D indicates that
indicates a graphical element that sometimes requires the negative tolerance shown in the diagram with normal dimensional accuracy.

The contents of the attribute information table can be changed as necessary.

Step _S1 The attribute information extraction unit 111 extracts a unit, that is, one item of attribute information (for example, attribute A) from the attribute information of the two-dimensional figure to be created, which is stored in the figure information storage device 14, and extracts the dimensioning target. 112.

Step _S2 The dimensioning object extraction unit 112 determines whether the input attribute information A is an element to be dimensioned, that is, a graphical element, and extracts the attribute of the graphical element. Attribute A is extracted because it is an attribute of a graphic element.

The graphic shape information extraction unit 113 extracts the graphic shape information of the graphic element having the extracted attribute A from the graphic information storage device 14 . The graphic element corresponding to the dimension indicated by A in FIG. 4 has attribute A.

Step S _{The 3-} axis parallel line segment extraction section 122 extracts line segments parallel to the X-axis or Y-axis from each graphic element having the extracted attribute A, and sends them to the graphic dimension information storage section 123.

Step _S4 The graphic dimension information storage section 123 stores the input starting point and ending point information of each line segment in the graphic information table 123a.

Step _S5 : The dimensional accuracy selection unit 121 selects the dimensional information of each graphic element having the attribute A extracted by the dimension entry target extraction unit 112, with reference to the dimensional information table 121a shown in FIG. From the dimension information table of FIG. 4, the number of significant digits of the dimension of each line segment having attribute A is selected to be one.
Note that since the tolerance is not specified, the prescribed tolerance value will be used.

This dimensional accuracy information is sent to the figure dimension information storage unit 123, and the figure information table 12
It is stored in the same area as the end point information of each line segment having attribute A of 3a.

Step _S6 When the above processing regarding attribute A is completed, the processing of steps _S1 to _S5 described above is repeated for each attribute B, C, D, etc. in sequence.

As a result, the end point (start point or end point) of each line segment parallel to the X-axis or Y-axis of the graphic element having attributes A, B, C, and D and its dimension information are entered in the graphic information table 123a.

In FIG. 4, each graphical element corresponding to dimensions indicated by B, C, and D has attributes B, C, and D.

Step _S7 The X-coordinate relocation unit 124 extracts the end points of each line segment and their dimensional accuracy information from the figure information table 123a, rearranges them in ascending order (or descending order) of the X-coordinate values, and creates the X-coordinate order table 124a.
Store in.

On the other hand, the Y coordinate relocation unit 125 extracts the end points of each line segment and their dimensional accuracy information from the graphic information table 123a, rearranges them in ascending order (or descending order) of Y coordinate values, and stores them in the Y coordinate order table 125a. By doing this, it is possible to write dimensions without overlapping when writing dimensions on the created figure.

Step _S8 The dimension entry data creation unit 126 creates the X coordinate order table 124a and the Y coordinate order table 12.
Dimensioning data of the graphic element to be dimensioned is created based on each rearranged end point of 5a and its dimensional accuracy information, and is stored in the dimensioning data table 126a.

Step _S9 The figure creation means 13 takes out dimension entry data from the dimension entry data table 126a and creates two-dimensional figure data with dimensions.

In that case, the dimension data in the X and Y directions are extracted and entered in the ascending order (or descending order) of the X and Y coordinate values, so each dimension is entered without overlapping, as shown in Figure 5. be done. In addition, the radius dimension (Fig. 5 C)
R2.00) is filled in using the conventional method.

By doing the above, as shown in Figure 5, dimensions are entered with the dimensional accuracy, that is, the number of digits, and the necessary tolerances corresponding to the attributes of each graphic element, and the drawing is easy to read without overlapping dimension entries. can be created efficiently.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(b) It is possible to select the precision of the dimensions drawn in accordance with the attributes of each graphic element of a two-dimensional figure.

(b) Necessary tolerances can be automatically entered in the entered dimensions.

(c) Since only the graphic elements that require dimension entry are extracted from the attributes of the constituent elements of the two-dimensional figure and dimension entry is performed, it is possible to efficiently create easy-to-read drawings without unnecessary dimension entry.

[Brief explanation of drawings]

Figure 1...Explanatory diagram of the basic configuration of the present invention, Figure 2...
An explanatory diagram of the configuration of an embodiment of the present invention, Fig. 3...A processing flowchart of the embodiment, Fig. 4...An explanatory diagram of a dimensional accuracy table used in the embodiment, Fig. 5...
An explanatory diagram of an example of a two-dimensional figure created by the same embodiment, FIG. 6... An explanatory diagram of an example of a two-dimensional figure created by the conventional automatic dimension entry method, in FIGS. 1 and 2, 11...Graphic shape information extraction means, 12...Dimension entry data creation means, 13...Graphic creation means, 14...Graphic information storage device.

Claims (1)

[Scope of Claims] 1. An automatic dimension entry method for a two-dimensional figure that automatically enters dimensions on a two-dimensional figure based on two-dimensional figure information having figure shape information and attribute information of the two-dimensional figure. , (a) a figure shape information extracting means 11 for extracting figure shape information of each figure element to be dimensioned from the two-dimensional figure information based on the attribute information in the two-dimensional figure information; (b) the dimensions. Dimensioning involves selecting the dimensional accuracy of a graphical element according to the attributes of the graphical element to be filled in, and creating dimension entry data for each graphical element to be dimensioned based on this dimensional accuracy information and graphical shape information. An automatic dimension entry method for a two-dimensional figure, comprising: data creation means 12; 2. Claims characterized in that the dimensional entry data creation means 12 selects the dimensional accuracy of a graphic element by referring to a dimensional accuracy table 121a in which attribute information and corresponding dimensional accuracy are entered. Automatic dimension entry method for two-dimensional figures as described in Section 1.