JPH05288502A - Boundary point detecting method for rounded boundary portion - Google Patents

Abstract

(57) [Summary] [Purpose] To stably detect the boundary point of the R-shaped boundary of the DUT. [Structure] R connecting the flat portion 3 and the rising portion 4 of the plate-like body 2
In the method of detecting the boundary point p of the plate-shaped boundary portion,
The gauge head 1A of the dial gauge 1 that is brought into contact with
When the dial gauge 1 is translated in parallel with a certain angle with respect to the flat portion, the increase rate of the measured displacement amount with respect to the translation amount of the dial gauge 1 reaches a constant value. It is determined to be.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boundary point detecting method for an R-shaped boundary portion.

[0002]

2. Description of the Related Art In a plate-like body manufacturing line such as a wall panel, the dimensions of each part of the plate-like body or the like are measured, and the diameter dimension thereof is compared with a corresponding standard dimension to make a pass / fail judgment. ..

Then, for example, when measuring the ear size of the peripheral ear portion with respect to the central convex portion of the plate-shaped body, the length from the outer edge of the plate-shaped ear to the boundary between the ear portion and the convex portion is measured. Will be done.

At this time, when the boundary between the ear and the convex is an R shape connecting the flat on the ear and the rising on the convex, the R-shaped boundary is Boundary points must be defined.

FIG. 4 shows a conventional method for detecting the boundary points of the R-shaped boundary portion by using the dial gauge 1. In FIG. 4, 2 is a plate-like body, 3 is a flat part, 4 is a rising part, p is a boundary point, and L is an ear size. That is, in the conventional method of FIG. 4, the contact point 1A of the dial gauge 1 is horizontally applied to the R-shaped boundary portion, and the point where the measured displacement amount of the dial gauge 1 sharply increases is determined as the boundary point. ..

Further, an optical dimension measuring device as disclosed in Japanese Patent Laid-Open No. 1-213504 is also known.

[0007]

However, when the probe 1A of the dial gauge 1 is applied horizontally as in the conventional method, the probe 1A slides on the R surface of the R-shaped boundary portion and a stable boundary point is obtained. Cannot be detected.

[0008] Further, the optical measuring device is expensive and the R-shaped boundary point is difficult to discriminate.

An object of the present invention is to stably detect the boundary point of the R-shaped boundary portion of the object to be measured.

[0010]

DISCLOSURE OF THE INVENTION The present invention is a method for detecting a boundary point of an R-shaped boundary portion connecting a flat portion and a rising portion of an object to be measured, which is a measuring element of a displacement gauge brought into contact with the object to be measured. Is moved parallel to the flat portion at a constant angle, and the increase rate of the measured displacement amount with respect to the parallel displacement amount of the displacement meter reaches a constant value. It is determined to be.

[0011]

When the probe of the displacement gauge is moved in parallel with the flat portion tilted at a constant angle, the probe does not slip on the R surface of the R-shaped boundary portion, and the displacement measured by the displacement gauge is flat. Sharply increases at the inflection point between the rising part and the rising part, that is, the boundary point.

Therefore, the point at which the increase rate of the measured displacement amount with respect to the parallel displacement amount of the displacement meter is a certain value (the rising angle θ formed by the displacement curve in FIG. 2) is defined as the boundary point.
According to this, it is possible to determine that the contact point of the tracing stylus, at which the increase rate of the measured displacement amount with respect to the parallel displacement amount of the displacement meter reaches the above-mentioned certain value (constant value), is the boundary point. The point can be detected stably.

[0013]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention, FIG. 2 is a schematic diagram showing a displacement curve of a displacement gauge, FIG. 3 is a schematic diagram showing a second embodiment of the present invention, and FIG. It is a schematic diagram which shows the conventional method.

(First Embodiment) (Refer to FIGS. 1 and 2) In FIG. 1, 10 is a dimension measuring device, which extends from the outer edge of the ear 2A of the plate-shaped body 2 to the ear 2A and the protrusion 2B. It is possible to measure the length (edge size L) to the boundary part of the.
The boundary between the ear portion 2A and the convex portion 2B has an R shape that connects the flat portion 3 on the ear portion 2A side and the rising portion 4 on the convex portion 2B side.

In the dimension measuring device 10, the operating handle 13 is rotatably fixed to the pedestal 11 by the fixing ring 12, and the male screw portion 16 of the measuring spindle 15 is linearly moved to the female screw portion 14 provided on the operating handle 13. It is screwed on only possible. Reference numeral 17 denotes a cap with a key fixed to the gantry 11. The key of the cap 17 engages with the key groove 18 of the male screw portion 16 to enable the male screw portion 16 to perform only the above-described linear movement.

That is, the dimension measuring apparatus 10 linearly moves the measuring spindle 15 by the rotation of the operating handle 13, and the linear moving amount of the measuring spindle 15 is determined by the operating handle 1.
It can be detected by the scale 13A provided in No. 3. A reference point for the scale 13A is engraved on the fixing ring 12.

The dimension measuring device 10 can hold the dial gauge 1 on the tip mounting portion 19 of the measuring spindle 15 at a constant inclination angle x.

At this time, the dial gauge 1 is used to detect the boundary point p of the R-shaped boundary portion when the dimension measuring device 10 measures the ear size as described above.

That is, in the present embodiment, the probe 1 of the dial gauge 1 which is brought into contact with the flat portion 3 of the plate-like body 2.
A is translated in parallel with the flat portion 3 at a constant angle x, and the increase rate of the measured displacement amount relative to the parallel displacement amount of the dial gauge 1 is a constant value (the rising angle θ formed by the displacement curve in FIG. 2). It is decided that the contact point of the tracing stylus 1A that reaches the boundary point p is the boundary point p.

Therefore, the measurer rotates the operating handle 13 of the dimension measuring device 10 while looking at the pointer of the dial gauge 1 so that the probe 1A of the dial gauge 1 contacts the outer edge of the ear 2A of the plate-like body 2. The reading of the scale 13A under the condition that the pointer of the dial gauge 1 shows that the pointer of the dial gauge 1 shows the measured displacement corresponding to the boundary point p in FIG. The above-mentioned ear dimension L can be measured from the difference of

That is, according to this embodiment, there are the following actions. When the probe 1A of the dial gauge 1 is moved in parallel with the flat portion 3 being tilted at a constant angle,
The probe 1A does not slip on the R surface of the R-shaped boundary portion, and the measured displacement amount of the dial gauge 1 sharply increases at the inflection point between the flat portion 3 and the rising portion 4, that is, the boundary point p.

Therefore, the point at which the increase rate of the measured displacement amount with respect to the parallel displacement amount of the dial gauge 1 becomes a certain value (the rising angle θ formed by the displacement curve in FIG. 2) is defined as the boundary point p. According to this, it can be determined that the contact point of the tracing stylus 1A at which the increase rate of the measured displacement amount with respect to the parallel movement amount of the dial gauge 1 reaches the above-mentioned certain value (constant value) is the boundary point p. The boundary point p can be stably detected, and the ear size L of the plate-shaped body 2 can be measured with high accuracy.

(Second Embodiment) (See FIG. 3) The second embodiment shown in FIG. 3 differs from the first embodiment described above in that
The points (1) to (3) below are as follows.

(1) In the dimension measuring device 20, as means for detecting the linear movement amount of the measuring spindle 15, instead of the scale 13A, the magnetic scale 21 provided on the measuring spindle 15 and the moving amount of this magnetic scale 21 are measured. Using the length measuring sensor 22 for detecting.

(2) Instead of the dial gauge 1, an electric displacement meter 23 of capacitance type or inductance type is used. The electric displacement meter 23 is held by the tip mounting portion 19 of the measuring spindle 15 at a constant tilt angle x, and
The measured displacement amount of A is electrically output.

(3) The size calculator 24 is used. That is,
The dimension calculator 24 outputs the displacement sensor 23 and the output of the length measurement sensor 22.
Of the displacement gauge 23, the probe 23A of the displacement gauge 23 is
Of the displacement sensor 23 under the condition where the displacement meter 23 outputs that it is in contact with the outer edge of the ear 2A of the
2 can measure the above-mentioned ear dimension L from the difference between the measured value and the output value of the length measurement sensor 22 under the condition that the measured displacement amount corresponding to the boundary point p in FIG. 2 is output.

According to the present embodiment, the boundary point p of the R-shaped boundary portion of the plate-shaped body 2 can be detected electrically stably, and the ear size L of the plate-shaped body 2 can be electrically measured with high accuracy. it can.

[0028]

As described above, according to the present invention, the boundary point of the R-shaped boundary portion of the object to be measured can be stably detected.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a displacement curve of a displacement meter.

FIG. 3 is a schematic diagram showing a second embodiment of the present invention.

FIG. 4 is a schematic view showing a conventional method.

[Explanation of symbols]

 1 dial gauge (displacement meter) 1A probe 2 plate-like body (object to be measured) 3 flat part 4 rising part x constant angle θ constant value p boundary point

Claims (1)

[Claims] 1. An R connecting a flat portion and a rising portion of an object to be measured.
In the method of detecting the boundary points of the boundary section, the displacement of the displacement gauge, which is brought into contact with the object to be measured, is translated at a fixed angle to the flat section, and the displacement of the displacement gauge is measured. A boundary point detection method for an R-shaped boundary portion, characterized in that the contact point of the tracing stylus at which the rate of increase in displacement reaches a constant value is determined to be the boundary point.