JP4363882B2 - Thickness measuring method and thickness measuring program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thickness measurement method for three-dimensional shape data of an object to be measured and a computer-readable thickness measurement program.
[0002]
[Prior art]
Conventionally, in the case of a product molded by injecting a material into a mold, for example, a product molded by injection molding or die casting, the thickness of the product shape becomes uneven, resulting in an extremely thick or thin portion. Sometimes.
Therefore, at the time of product design, it is measured whether the product is thick or thin (see, for example, Patent Documents 1, 2, 3, and 4).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-238082
[Patent Document 2]
Japanese Patent Laid-Open No. 10-124555
[Patent Document 3]
Japanese Patent Laid-Open No. 2000-122996
[Patent Document 4]
Japanese Patent Laid-Open No. 2002-63219
[Problems to be solved by the invention]
In each of the above-mentioned documents, a method for measuring a wall thickness by a normal line is shown. However, depending on the shape of an object to be measured, it is difficult to perform an appropriate measurement simply by using the normal line.
[0008]
In consideration of the above circumstances, the present invention is a reliable thickness measurement method and thickness measurement program capable of easily and appropriately measuring thick and thin walls regardless of the shape of the object to be measured. The purpose is to provide.
[0009]
[Means for Solving the Problems]
In the thickness measuring method according to the first aspect of the present invention, the computer displays the three-dimensional shape data of the object to be measured on the display , and the first method starts from the measurement points set on each surface of the three-dimensional shape data in the display. and to step it extended line, computer, in the display representation, and extending it to step a second normal from the point where the first normal line intersects the opposing surface, the computer, in the display representation, the first a step asking you to angle between 2 normal to the first normal, computer, in the display representation, on condition that the determined angle is less than the set value, the measurement point and the above intersection the distance comprises the steps of measuring a thickness, a.
[0010]
According to a fourth aspect of the present invention, there is provided a computer-readable thickness measurement program for extending a first normal from a measurement point set on each surface of three-dimensional shape data of an object to be measured; A second procedure for extending the second normal from a point where the first normal intersects the opposing surface, a third procedure for obtaining an angle between the second normal and the first normal, and the obtained angle. And a fourth procedure for measuring the distance between the measurement point and the intersection as a thickness on the condition that is less than a set value.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a personal computer according to the present invention. A CPU 1 includes a keyboard 2 for inputting various data, a mouse 3 for various operations, a CRT display 4 for displaying data, a memory 5 for storing data and programs, and a hard disk 6. Is connected. The hard disk 6 stores a three-dimensional CAD program and three-dimensional shape data. The memory 5 stores a computer-readable thickness measurement program for realizing the present invention.
[0012]
The CPU 1 includes the following (1) to (8) as main functions.
(1) Means for creating three-dimensional shape data in accordance with the operation of the keyboard 2 and mouse 3 by the operator when starting the three-dimensional CAD program, and storing the created three-dimensional shape data in the hard disk 6.
[0013]
(2) Means for displaying the three-dimensional shape data in the hard disk 6 on the display 4 when setting the thickness measurement mode.
[0014]
(3) Means for setting a plurality of measurement points (measurement start points) for each surface of the three-dimensional shape data of the measurement object displayed on the display 4 in accordance with the operation of the keyboard 2 and the mouse 3 by the operator.
[0015]
(4) Means for extending the first normal from each of the set measurement points.
[0016]
(5) Means for extending the second normal from the point (measurement end point) where the first normal intersects the opposing surface.
[0017]
(6) Means for obtaining an angle Q between the second normal and the first normal.
[0018]
(7) On the condition that the obtained angle Q is less than the set value Qs, the distance between the measurement point (measurement start point) and the intersection (measurement end point) is measured as a wall thickness, and the measured distance is allowed. Means to invalidate measurement when the maximum value is exceeded.
[0019]
(8) Means for displaying by color or text on the three-dimensional shape data displayed on the display 4 of the measured thickness.
[0020]
Next, the operation of the above configuration will be described with reference to FIGS.
When the thickness measurement mode is set (YES in step 101), the three-dimensional shape data in the hard disk 6 is displayed on the display 4 as shown in FIG. 4 (step 102). In this state, an evaluation parameter is input by the operator (step 103). The evaluation parameters are a thin wall discrimination value (for example, 0.5 mm) Xthin, a thick wall discrimination value (for example, 2.0 mm) Xfat, an allowable maximum value (for example, 30 mm) Xmax, and the number of in-plane measurement start points.
[0021]
Along with the input of this evaluation parameter, as shown in FIG. 2, a plurality of measurement start points are set at equal intervals for each surface of the three-dimensional shape data (step 104). The number of measurement start points corresponds to the number of input in-plane measurement start points. In FIG. 2, the number of measurement start points is small for convenience of explanation.
[0022]
When these measurement start points are set, the first normal line (vertical vector line) is extended from one of the measurement start points toward the inner facing surface (step 105). For example, a measurement end point A2 is obtained in which a normal extends from the measurement start point A1 and the normal intersects the opposing surface (step 106). Then, the second normal line (vertical vector line) is extended from the measurement end point A2 toward the inner facing surface (step 107).
[0023]
An angle Q between the second normal line and the first normal line is obtained (step 108), and the angle Q is compared with the set value Qs (step 109). If the angle Q is less than the set value Qs (YES in step 109), the distance X between the measurement start point A1 and the measurement end point A2 is determined based on the determination that the measurement start point A1 and the measurement end point A2 are suitable as measurement points. Is measured as the wall thickness (step 110).
[0024]
If the measured thickness X is equal to or smaller than the thinness discrimination value Xthin (YES in step 111), the thinness flag f1 is set to “1” (step 112).
[0025]
If the measured thickness X is greater than or equal to the thickness discrimination value Xfat (YES in step 113) and less than the allowable maximum value Xmax (YES in step 114), the thickness flag f2 is set to “1” (YES in step 114). Step 115). If the wall thickness X has reached the allowable maximum value Xmax (NO in step 114), a flag f3 indicating that the measurement is invalid is set to "1" (step 116).
[0026]
As an example of the situation where the wall thickness X is equal to or greater than the allowable maximum value Xmax, there is a measurement in the longitudinal direction from the measurement start point F1 to the measurement end point F2 shown in FIG. This thickness measurement is invalid.
[0027]
If the angle Q is equal to or larger than the set value Qs (NO in step 109), the measurement is invalid based on the determination that the distance between the measurement start point A1 and the measurement end point A2 is not appropriate as a measurement location. A flag f3 indicating that is set to "1" (step 116).
[0028]
In this way, the measurement for a plurality of measurement start points set on one surface is repeated in the same manner. One surface is a surface on the three-dimensional shape data. Even if the object to be measured is a sphere, there are a plurality of surfaces on the three-dimensional shape data on the surface.
[0029]
When measurement for all measurement start points on one surface is completed (YES in step 117), if even one thin flag f1 is “1” in one surface, it is determined that the surface is thin. A display for each color is added to the three-dimensional shape data on the display 4. For example, it is displayed in yellow.
[0030]
When measurement for all measurement start points on one surface is completed (YES in step 117), if even one thick flag f2 is “1” in one surface, the surface is thick. Is added to the three-dimensional shape data on the display 4. For example, it is displayed in blue.
[0031]
When measurement for all measurement start points on one surface is completed (YES in step 117), if the thin flag f1 = "1" and the thick flag f2 = "1" coexist in one plane, Since the thin surface and the thick wall coexist on the surface, the display according to color is added to the three-dimensional shape data on the display 4. For example, it is displayed in green.
[0032]
Then, the flags f1, f2, and f3 are set to “0” (step 119), and the measurement for a plurality of measurement start points set on other surfaces is similarly repeated.
[0033]
When the measurement for each measurement start point set on all the surfaces is completed (YES in step 120), the wall thickness measurement mode is terminated.
[0034]
As described above, the normal is extended from the measurement point set on each surface of the 3D shape data of the object to be measured, and the distance between the point where the normal intersects the opposite surface and the measurement point is measured as the thickness. Therefore, thick and thin walls can be easily measured, and high reliability regarding measurement can be ensured.
[0035]
In particular, when the angle Q of each normal is equal to or greater than the set value Qs, the measurement is invalidated, so that appropriate measurement can always be performed regardless of the shape of the object to be measured, and high reliability can be obtained with respect to the measurement. it can.
[0036]
Since the measurement is invalidated when the wall thickness X is equal to or greater than the allowable maximum value Xmax, the reliability of the measurement is greatly improved in this respect as well.
[0037]
In the above-described embodiment, the measurement result is displayed by color on the three-dimensional shape data. However, as shown in FIG.
[0038]
In addition, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined.
[0039]
【The invention's effect】
As described above, according to the present invention, there is provided a reliable thickness measuring method and thickness measuring program capable of easily and appropriately measuring thick and thin walls regardless of the shape of the object to be measured. Can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a diagram for explaining an example of a measurement start point, a normal line, and a measurement end point in one embodiment.
FIG. 3 is a flowchart for explaining the operation of the embodiment;
FIG. 4 is a view showing a display example of three-dimensional shape data in one embodiment.
FIG. 5 is a view showing a modification of the display in FIG. 4;
[Explanation of symbols]
1 ... CPU, 2 ... keyboard, 3 ... mouse, 4 ... CRT display, 5 ... memory, 6 ... hard disk

Claims (4)

A computer displaying the three-dimensional shape data of the object to be measured on a display and extending a first normal from a measurement point set on each surface of the three-dimensional shape data in the display ;
A computer extending a second normal from a point where the first normal intersects a facing surface in the display ;
A computer determining an angle between the second normal and the first normal in the display ;
The computer measures the distance between the measurement point and the intersection as a wall thickness on the condition that the obtained angle is less than a set value in the display display ;
A method for measuring a wall thickness, comprising: In the thickness measuring method according to claim 1,
The measuring step invalidates the measurement when the measured distance is equal to or greater than an allowable maximum value. In the thickness measuring method according to claim 1 or 2,
Computer, a wall thickness of said measured wall thickness measuring method characterized by further comprising a step of: Color indications or characters displayed on the three-dimensional shape data are display representation. On the computer,
A first procedure for extending a first normal from a measurement point set on each surface of the three-dimensional shape data of the object to be measured;
A second procedure for extending a second normal from a point where the first normal intersects the opposing surface;
A third procedure for determining an angle between the second normal and the first normal;
A fourth procedure for measuring the distance between the measurement point and the intersection as a thickness on the condition that the obtained angle is less than a set value;
A computer-readable wall thickness measurement program characterized by realizing

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