JP2006155520A - Drawing check program, drawing check method and drawing check device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing check program, a drawing check method and a drawing check device, automatically detecting a part insufficient for a dimension entry, in a check of a drawing designed by a CAD. <P>SOLUTION: A chamfering part is deleted from shape data constituting CAD data, a virtual line extended in a line segment direction of a straight line segment of the shape data by a prescribed length is generated, and the virtual line and the CAD data are displayed when a dimension additional line overlapping the virtual line is not found in reference to dimension data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to inspection of drawings designed by CAD, and more specifically, inspection that supports a designer's inspection work by automatically detecting a lack of dimension entry for a drawing created by a two-dimensional CAD system. The present invention relates to a drawing program, a drawing method, and a drawing apparatus.

  In general, at the end of the design work, the inspection work is performed based on the designed drawing. The inspection is performed from the viewpoints of checking from the viewpoint of function and performance, checking from the viewpoint of design / manufacturing standard, and checking from the cost side such as over spec. Therefore, the person who performs the inspection is often performed by a person with high skills in design and manufacturing, and it is often performed with sufficient time. If this inspection work is neglected, defects will occur in the manufacturing process, which will eventually become high.

  As a recent design, a CAD (Computer Aided Design) design using a computer has become common. Therefore, the data of the designed drawing is electronic data, and what is possible using a computer for checking the CAD data is checked by the computer.

For example, as a method for detecting a lack of dimension entry, constraint condition data (specifically, two graphic elements and dimension data between the elements) defining the relative positional relationship between graphic elements in CAD data is stored. In addition, grouping of graphic element data is performed based on the constraint condition data, and when the group is divided into a plurality of groups, there is no condition for constraining between the groups (that is, no dimension is given). It is said that it is detected (patent document 1).
Japanese Patent No. 3537956

  As described above, the inspection work is important. However, the inspection process using a computer is demanded today, which is a time-consuming operation and CAD design is common. The method for detecting the lack of dimension entry shown in Patent Document 1 can detect the lack of dimension entry for one figure, but it is not necessarily 1 when one figure is represented by a three-view drawing. It is not always the case that the dimensions are shown on the two views. For example, even a dimension that is not shown in the front view may be shown in the side view, and Patent Document 1 has a problem in which this is not taken into consideration. In addition, it is assumed that there are dimension data and the graphic elements that are the target of the dimension data as the constraint condition data, but this method cannot be implemented if there are no target graphic elements and only the dimension data. There is also the problem of being there.

  The present invention solves the above-described problem and provides a drawing program, a drawing method, and a drawing apparatus that detect a lack of dimension entry using graphic element data and size data, corresponding to a three-view drawing.

The inspection program, inspection method and inspection apparatus of the present invention are configured as follows.
(1) First invention In the first invention, the dimension display is accompanied by a dimension extension line (also referred to as a dimension lead line) together with the dimension line, and the dimension extension line is basically an extension of shape data representing the shape of the figure. In other words, a location with insufficient dimensions is detected from CAD data.

  FIG. 1 shows the principle of the invention, and comprises a CAD data acquisition procedure 10, a chamfer deletion procedure 20, a virtual line generation procedure 30, a dimension deficiency determination procedure 40, and a dimension deficiency location display procedure 50.

  The CAD data acquisition procedure 10 captures CAD data of a drawing to be examined. CAD data is composed of shape data and dimension data. The shape data is a set including line segment elements such as straight lines and arcs. The dimension data is data for displaying the dimension of a figure and includes dimension extension lines and dimension line segment elements. It is a set containing.

  The chamfer deletion procedure 20 deletes the line segment element of the chamfered portion from the shape data in the CAD data, extends the two line segment elements connected to the chamfered portion, and extends the two line segment elements to the intersecting point. To do. Chamfering has a “corner” (also called C chamfering) that cuts the corner with a straight line, and a “fillet” (also called R chamfering) that rounds the corner, but the shape data of the chamfered part is a straight line segment. The latter is represented by an arc segment, and this segment is deleted. Further, the line segment connected to the chamfered portion is a straight line segment, and the straight line segment is extended to the intersection where the straight line segment is extended. FIG. 2A shows a chamfered portion of a corner, and FIG. 2B shows a state where a straight line of the chamfered portion is deleted and a straight line connected to the chamfered portion is extended to an intersection (FIG. 2). The dotted line part is the extended part). 3 (a) and 3 (b) show the same contents for the fillet.

  The virtual line generation procedure 30 extends the start and end points of the straight line segment element of the shape data from which the chamfered portion is deleted to a predetermined length in the direction of the line segment element, thereby forming a virtual line.

  In the dimension shortage determination procedure 40, a line segment element of a dimension extension line that overlaps the generated virtual line is searched from the dimension data, and when the line segment element is not searched (that is, when the line segment element does not exist), the dimension is insufficient. Is determined. FIG. 4A shows an imaginary line, a dimension extension line, and a dimension line, and shows an example in which the dimension extension line overlaps the virtual line (that is, the dimension extension line is on the imaginary line).

The insufficient dimension location display procedure 50 displays the CAD data before deleting the chamfered portion and the virtual line determined to be insufficient in the dimension insufficient determination procedure 40.
(2) Second invention In the second invention, the shape data constituting the CAD data is divided for each plan view constituting the drawing, and the dimension that overlaps the virtual line generated for each plan view in the dimension shortage determination procedure 40. Search line element of auxiliary line from dimension data, and if line element is not searched in one plan, if there is a line element of extension line in corresponding virtual line of other plan, it is determined that the dimension is insufficient Don't be. Here, the side view means a front view, a plan view, a side view, etc. in mechanical drawing. That is, it is separated from the shape data of the front view and the shape data of the side view, and even if there is no dimension extension line in the virtual line of the front view, if there is a dimension extension line in the corresponding virtual line of the side view, It is not to be.
(3) Third invention In the third invention, a line segment element of a dimension extension line that overlaps the virtual line in the dimension shortage determination procedure 40 is searched from the dimension data, and if the line segment element does not exist, the virtual element is further calculated. A dimension element line segment element within a predetermined range from the start point and end point of the line segment element of the shape data overlapping the line is retrieved from the dimension data, and it is determined that the dimension is insufficient when the line segment element is not retrieved. FIG. 4B shows an example in which the dimension extension line has an angle and does not overlap the virtual line but is in a predetermined range from the start and end of the line segment element of the shape data. Therefore, it is determined that FIG. 4B is not short of dimensions.
(4) 4th invention 4th invention is the inspection method based on 1st invention.
(5) Fifth Invention The fifth invention is an inspection apparatus based on the first invention.

  According to the first aspect of the invention, it is possible to provide a drawing program that can automatically detect a lack of dimension entry from CAD data composed of shape data and dimension data.

  According to the second invention, for example, even when the position of the drawing in which the side view is drawn is different from the position in the height direction, the dimensions corresponding to the side view are not entered. If it is made, it is not considered that the dimension is insufficient, so that the accuracy of the dimension insufficient detection is improved.

  According to the third aspect of the present invention, the presence of a dimension can be identified even when the dimension extension line is represented with an angle, and the accuracy of the dimension shortage detection is improved.

  According to the fourth and fifth inventions, it is possible to provide a charting method and a charting apparatus capable of automatically detecting a lack of dimension entry from CAD data.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 5 shows an example of the configuration of the inspection apparatus 100. The inspection apparatus 100 has a CPU (Central Processing Unit) 110 for controlling data and programs, a display 120 for displaying CAD data, and a figure number to be inspected. The keyboard 130, the display 120, the input / output control unit 140 for controlling the input / output of the keyboard 130, the CAD data storage unit 150 storing CAD data, and the inspection program 160 are configured.

  The inspection program 160 further includes a CAD data acquisition unit 161, a chamfering deletion unit 162, a virtual line generation unit 163, an insufficient dimension determination unit 164, and an insufficient dimension display unit 165.

  The CAD data acquisition unit 161 performs processing of taking out target data from the CAD data storage unit 150 based on the drawing target drawing number input by the operator from the keyboard 130 and placing it in a work area of a memory (not shown).

  The chamfer deletion unit 162 extracts a chamfer from the shape data in the CAD data arranged in the work area, and deletes a line segment constituting the chamfer. Subsequently, a process of extending the two straight line segments connected to the chamfered portion to the intersection is performed.

  The virtual line generation unit 163 generates a virtual line by extending a straight line segment element in the straight line direction with respect to the shape data processed by the chamfer deletion unit 162. This process is performed for all straight line segments, and when the virtual lines overlap, it is assumed to be one line.

  The dimension shortage determination unit 164 refers to the dimension data for each virtual line generated by the virtual line generation unit 163, and within a predetermined range from the start and end points of the dimension auxiliary line that overlaps the virtual line or the shape line that overlaps the virtual line. If there is a dimension extension line, it is determined that the dimension is present, and if neither is present, it is determined that the dimension is insufficient.

  The under-dimension location display unit 165 displays the virtual line whose size is insufficient by the under-dimension determination unit 164 and the CAD data before the chamfer deletion process is performed. The virtual line is highlighted so that it can be easily identified for the CAD data. The highlighted imaginary line is a location with insufficient dimensions.

  Next, an example of data in the CAD data storage unit 150 will be described. FIG. 6 is an example of a drawing stored in the CAD data storage unit 150. The drawing includes two front views, a front view and a side view. The two arc portions at the top of the front view are chamfered portions (fillets). It shall be. FIG. 6 is a diagram showing a state in which the dimension “L3” between y1 and y2 or between y2 and y4 is missing (insufficient).

FIG. 7 shows an example of CAD data in the drawing of FIG. 6. The upper diagram shows a data structure, and the lower diagram shows an example of the data. In the data structure, the data of one plan is constituted by the plan view ID, the shape data, and the dimension data, and if one drawing is composed of a plurality of plan views, the data for the plan view is held. In the lower data example, the front ID “front” indicates a front view, and the shape data is “line ID, start point coordinates (x, y), end point coordinates (x ′, y ′)”. Represents one line segment. Further, the line segment ID is represented by “line segment type + sequential number”. The first “l1, x1, y1, x1, y3” data is the first straight line, the start point coordinates (x1, y1), and the end point. The coordinates are (x1, y3). “A1, x1, y3, x2, y4, r1” in the next data indicates that the arc is number 1, the start point coordinates are (x1, y3), the end point coordinates are (x2, y4), and the radius is r1. (The arc is assumed to be clockwise.)
Next, in the dimension data, one dimension data is represented by two dimension extension lines, dimension lines, and dimension values (the data shall be arranged in this order). That is, “d1, u1, v1, u1, v3” are “line segment ID, start point coordinates (u, v), end point coordinates (u ′, v ′)” of one dimension extension line, and “d2,. "..." represents a second auxiliary line, "d3, ..." represents a dimension line with an arrow, and "L1" represents a dimension value.

  Next, a flow for detecting a lack of dimensions will be described with reference to FIG.

  First, the CAD data is fetched from the CAD data storage unit 150 based on the figure number input by the operator and arranged in the work area (S100).

  For the shape data of the CAD data arranged in the work area, the line segment element that creates the chamfered portion is deleted by the chamfered portion deletion routine, and the straight line segment connected to the line segment is extended to the intersection. The chamfer deletion routine will be described later (S110).

  With respect to the shape data for which the chamfered portion has been deleted, a straight line is extended by a predetermined length in the length direction to generate a virtual line. The generation of the virtual line is performed for all the straight line segments and is generated separately from the shape data. Subsequently, when there are overlapping virtual lines, the virtual lines in the overlapping portion are deleted so as to become one virtual line. For example, if there are a plurality of horizontal straight line segments having the same y coordinate (that is, horizontal straight line segments at the same height), a plurality of virtual lines are generated. One virtual line. FIG. 9 shows the state of the virtual lines generated for the shape data from which the chamfered part has been deleted. The virtual lines (1) to (5) and (11) to (13) are generated. Thus, the length of the virtual line is generated so as to have a sufficient length so that the shape data and the dimension data can be accommodated. (S120, S130).

  Next, the underdimension detection loop is entered. First, the overlap of the dimension extension line is examined with respect to the virtual line generated by referring to the dimension data. Since the length of the dimension extension line is shorter than the length of the imaginary line, the overlap here means that the dimension extension line is on the imaginary line. If there is a dimension extension line that overlaps the virtual line, it is determined that the dimension has been entered in this virtual line, and the overlap of the dimension extension line is similarly examined for the next virtual line. In FIG. 9, the imaginary lines excluding the imaginary line (12) have overlapping dimension extension lines, and it can be seen that the dimensions are entered.

  When no overlapping dimension extension line is found, a straight line segment element that overlaps the virtual line is extracted from the shape data. Since the virtual line is originally generated by extending the straight line segment element of the shape data, there must be at least one line segment. It is checked whether or not a dimension extension line exists within a predetermined range of the coordinates of the start and end points of the extracted line segment element. Specifically, for example, it is checked whether or not the coordinates of the start point or the end point of the extension line are within a radius of 1 mm centering on the coordinates of the start point and the end point of the extracted straight line segment. If there is a starting point or an ending point of the extension line in the range (that is, if there is an extension line), there is a dimension entry corresponding to the virtual line. If not, it is determined that the dimension is insufficient, and a flag for identifying that the dimension is insufficient is attached to the virtual line. The process of checking the existence of a dimension extension line for the predetermined range of the start and end points of the straight line segment extracted from the shape data is to check whether or not the dimension is entered when the dimension extension line has an angle as shown in FIG. Have done that. If there are a plurality of extracted straight line segments, the existence of dimension extension lines is examined for a plurality of start and end points. The above processing is performed for all virtual lines. (S140 to S190).

  An imaginary line with a flag indicating insufficient dimension and CAD data before the chamfered portion is deleted are displayed on the display 120 as shown in FIG. 10, for example. It is assumed that the virtual line is highlighted with respect to the CAD data, and that the dimension data is insufficient for the shape data on the virtual line (S200).

  Next, the flow of the chamfered portion deletion routine will be described with reference to FIG. Here, the line segment element of the chamfer is extracted from the CAD data shape data arranged in the work area of the memory. In this extraction, for example, in the corner chamfering shown in FIG. 2A, the straight line segment has an angle of 45 degrees in the shape data, and if L1 and L2 are 0.5 mm or less, the 45 degrees A straight line segment element having an angle is extracted as a chamfer. In FIG. 3A, an arc line segment is found from the shape data, and if the radius of the arc is also 0.5 mm or less, the arc line segment is extracted as a chamfer (S300).

  Subsequently, the line segment elements of the cornered straight line or the fillet arc are deleted, two line segment elements connected to them are found, and the two line segments are extended to a point where they intersect with each other. The dotted lines in FIGS. 2 (b) and 3 (b) show how they extend to the intersecting points. The shape data that has undergone the chamfer deletion process is stored and stored in a work area that is different from the shape data before the deletion process. (S310-S330).

  With the above flow, it is possible to detect a lack of dimension from CAD data. In the embodiment shown here, the front view and the side view are at the same height in the drawing (the bottoms of the front view and the side view are created at the same height). Could be done. Such drawing creation is common, but even if the side view is placed at a different height, data is provided for each side view as shown in the CAD data example of FIG. Detection of lack of dimensions is possible.

In addition to the above examples, the following additional notes are disclosed.
(Appendix 1)
A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A drawing inspection program for detecting the lack of dimension entry of
A CAD data acquisition procedure for capturing the CAD data of the drawing to be verified;
A chamfer deletion procedure for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect each other; ,
A virtual line generation procedure for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion procedure;
Searching for a line segment element of a dimension extension line that overlaps the imaginary line from the dimension data, and determining an insufficient dimension when the line segment element is not searched;
An inspection program for causing a computer to execute CAD data before the chamfering deletion procedure is executed and an insufficient dimension location display procedure for displaying the virtual line determined to be insufficient.

(Appendix 2)
The shape data is divided into the CAD data for each surface view constituting the drawing,
In the dimension shortage determination procedure, a line segment element of a dimension extension line that overlaps an imaginary line generated for each plane view is searched from the dimension data, and when the line segment element is not searched in one plane view, the other plane The inspection program according to appendix 1, wherein if the line segment element is searched for a corresponding virtual line in the figure, it is not determined that the dimension is insufficient.

(Appendix 3)
In the dimension shortage determination procedure, a line segment element of a dimension extension line that overlaps the virtual line is searched from the dimension data, and when the line segment element is not searched, the line segment element of the shape data that overlaps the virtual line is subsequently detected. 2. The inspection according to appendix 1, wherein a line segment element of a dimension extension line existing within a predetermined range from a start point and an end point is searched from the dimension data, and it is determined that the dimension is insufficient when the line segment element is not searched. program.

(Appendix 4)
A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A method for detecting the lack of dimension entry of
A CAD data acquisition procedure for capturing the CAD data of the drawing to be verified;
A chamfer deletion procedure for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect each other; ,
A virtual line generation procedure for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion processing;
Searching for a line segment element of a dimension extension line that overlaps the imaginary line from the dimension data, and determining an insufficient dimension when the line segment element is not searched;
A drawing inspection method comprising: an underdimension location display procedure for displaying CAD data before the chamfering deletion procedure is performed and the virtual line determined to be undersize.

(Appendix 5)
A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A drawing inspection device for detecting a lack of dimension entry of
CAD data acquisition means for fetching the CAD data of the drawing to be verified;
A chamfer deleting means for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect. ,
Virtual line generation means for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion processing;
A dimension deficiency determining unit that searches a line segment element of a dimension extension line that overlaps the virtual line from the dimension data, and determines that the dimension is insufficient when the line segment element is not searched,
An inspection apparatus comprising: a lacking dimension display means for displaying CAD data before the chamfering deletion procedure is performed and the virtual line determined to be insufficient.

(Appendix 6)
The inspection program according to appendix 1, wherein the dimension-insufficient location display procedure highlights the CAD data for simultaneously displaying the virtual line determined to be insufficient in dimension.

It is a principle figure (the 1) of an invention. It is an example (in the case of a corner) of extraction and deletion of a chamfer. It is an example (in the case of a fillet) of extraction and deletion of a chamfer. It is a principle figure (part 2) of the invention. It is a structural example of an inspection apparatus. It is an example of drawing of inspection object. It is an example of CAD data. It is an example of the detection processing flow of a dimension shortage. Virtual line generation and dimension extension lines. It is an example of a display of the virtual line which shows lack of a dimension. It is an example of a processing flow of a chamfer part deletion routine.

Explanation of symbols

10 CAD Data Acquisition Procedure 20 Chamfering Deletion Procedure 30 Virtual Line Generation Procedure 40 Dimensional Insufficient Judgment Procedure 50 Dimensional Deficient Location Display Procedure 60 Shape Data Line Segment Element 70 Dimensional Supplement Line Segment Element 80 Dimension Line Segment Element 90 Virtual Line 100 Chart inspection device 110 CPU
DESCRIPTION OF SYMBOLS 120 Display 130 Keyboard 140 Input / output control part 150 CAD data memory | storage part 160 Checking program 161 CAD data acquisition part 162 Chamfering deletion part 163 Virtual line generation part 164 Insufficient dimension determination part 165 Insufficient dimension display part

Claims (5)

A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A drawing inspection program for detecting the lack of dimension entry of
A CAD data acquisition procedure for capturing the CAD data of the drawing to be verified;
A chamfer deletion procedure for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect each other; ,
A virtual line generation procedure for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion procedure;
Searching for a line segment element of a dimension extension line that overlaps the imaginary line from the dimension data, and determining an insufficient dimension when the line segment element is not searched;
An inspection program for causing a computer to execute CAD data before the chamfering deletion procedure is executed and an insufficient dimension location display procedure for displaying the virtual line determined to be insufficient. The shape data is divided into the CAD data for each surface view constituting the drawing,
In the dimension shortage determination procedure, a line segment element of a dimension extension line that overlaps an imaginary line generated for each plane view is searched from the dimension data, and when the line segment element is not searched in one plane view, the other plane The inspection program according to claim 1, wherein if the line segment element is searched for a corresponding virtual line in the figure, it is not determined that the dimension is insufficient. In the dimension shortage determination procedure, a line segment element of a dimension extension line that overlaps the virtual line is searched from the dimension data, and when the line segment element is not searched, the line segment element of the shape data that overlaps the virtual line is subsequently detected. The line segment element of the extension line existing within a predetermined range from the start point and the end point is searched from the dimension data, and it is determined that the dimension is insufficient when the line segment element is not searched. Figure program. A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A method for detecting the lack of dimension entry of
A CAD data acquisition procedure for capturing the CAD data of the drawing to be verified;
A chamfer deletion procedure for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect each other; ,
A virtual line generation procedure for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion processing;
Searching for a line segment element of a dimension extension line that overlaps the imaginary line from the dimension data, and determining an insufficient dimension when the line segment element is not searched;
A drawing inspection method comprising: an underdimension location display procedure for displaying CAD data before the chamfering deletion procedure is performed and the virtual line determined to be undersize. A drawing created by CAD data composed of shape data that includes a line segment element of a straight line and an arc, and dimension data that includes a dimension line including a dimension extension line and a line segment element of the dimension line. A drawing inspection device for detecting a lack of dimension entry of
CAD data acquisition means for fetching the CAD data of the drawing to be verified;
A chamfer deleting means for extracting a chamfered portion from the acquired shape data of the CAD data, deleting a line segment element of the chamfered portion, and extending until two line segment elements connected to the line segment element of the chamfered portion intersect. ,
Virtual line generation means for generating a virtual line obtained by extending the line segment element by a predetermined length in the line segment direction with respect to the straight line segment element of the shape data subjected to the chamfer deletion processing;
A dimension deficiency determining unit that searches a line segment element of a dimension extension line that overlaps the virtual line from the dimension data, and determines that the dimension is insufficient when the line segment element is not searched,
An inspection apparatus comprising: a lacking dimension display means for displaying CAD data before the chamfering deletion procedure is performed and the virtual line determined to be insufficient.

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