JP2000263379A - Method and apparatus for measuring average outer diameter of rotating body - Google Patents

Abstract

(57) [Summary] (With correction) [Problem] One rotation can be detected when the measurement object has a curvature fluctuation or when there is a characteristic waveform, but when the surface accuracy is high, It is difficult to detect one rotation. When trying to apply to a cutting machine or a grinding machine, it is impossible to measure while cutting the surface.The average outer diameter of a cylindrical or cylindrical workpiece is measured with sufficient accuracy during rotation such as cutting or grinding. It can be measured. SOLUTION: A material to be measured 40 and a non-contact type length measuring sensor 6 are provided.
0, the rotation angle of the material to be measured 40 and the circumference C corresponding to the rotation angle are measured, and the average outer diameter of the material to be measured 40 is determined from the measured circumference and the rotation angle. Calculate D. The length measurement sensor 60 has a mechanism of keeping the distance L constant by being contacted via the ball 72 and pressed against the material to be measured 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an average outer diameter measuring method and apparatus for measuring the average outer diameter of a rotating body during rotation, and more particularly to a method for measuring the average outer diameter of a cylindrical or cylindrical material to be measured. The present invention relates to a method and an apparatus for measuring the average outer diameter of a rotating body, which are suitable for use during measurement during rotation such as cutting or grinding.

[0002]

2. Description of the Related Art A conventional apparatus for measuring the average outer diameter or circumference of a cylindrical or cylindrical material to be measured during rotation is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-340411. There is a measuring device. This measuring apparatus focuses on the variation pattern of the curvature of the outer periphery of the steel pipe as shown in FIG. 1 given at the time of mechanical expansion of the UOE steel pipe, and detects one rotation based on the autocorrelation value of the displacement data on the outer peripheral surface. Is measured.

[0003] Specifically, as shown in FIG. 2, the circumferential displacement of the outer peripheral surface of the UOE steel pipe 12 being rotated by the turning roller 10 is positioned by a pair of rollers 20 abutting on the surface of the UOE steel pipe 12. A pulse signal is generated in accordance with the rotation of the contact-type measuring roller 22. The pulse signal is measured using a pulse generator 24 and a pulse generating circuit 26, while the displacement is measured by a displacement measuring device 30 provided between the rollers 20. The curvature fluctuation is measured by detecting the radial displacement of the outer peripheral surface of the UOE steel pipe 12. The displacement measuring device 30
After measuring the displacement data of the outer peripheral surface measured by the data sampling device 32 over a range exceeding one rotation by a predetermined amount, the auto-correlation calculating device 34, as shown in FIG. The autocorrelation value Mn is calculated while shifting at a constant circumference pitch n in a certain section before and after the length,
As shown in FIG. 4, a shift amount n ′ that maximizes the autocorrelation value Mn is obtained, the circumference is calculated by adding the reference circumference to the circumference calculation device 36, and displayed on the circumference display device 38. . In FIG. 2, reference numeral 14 denotes a floor.

In this circumference measuring device, the material to be measured is U
To detect one rotation of the OE steel pipe 12, attention is paid to the variation pattern of the curvature of the outer circumference, and the point at which the autocorrelation value of the displacement data on the outer circumference becomes the maximum is defined as the point of one rotation.

[0005]

However, this detection method has the following problems.

(1) When the object to be measured has a large variation in curvature due to a joint or the like on the outer peripheral surface of the material to be measured, such as a UOE steel pipe to which mechanical expansion is performed, or when the surface accuracy is rough,
When there is a characteristic waveform, it is possible to detect one rotation based on the similarity of the waveform shapes, that is, the magnitude of the autocorrelation value. However, when the surface accuracy is high, such as a precisely processed material to be measured. However, it is difficult to detect one rotation based on the autocorrelation value, and the measurement target is limited.

(2) In this detection method, one rotation is detected based on the similarity of the outer peripheral surface shape of the material to be measured. Therefore, when applying to a cutting machine or a grinding machine, it is impossible to perform measurement while shaving the surface. It is. That is, the procedure of cutting and measurement is “cut →
This is an intermittent repetition of “measurement → cutting” after cutting is interrupted, making continuous cutting impossible and inefficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to measure the average outer diameter of a cylindrical or cylindrical material to be measured even during cutting or grinding. .

[0009]

According to the present invention, when measuring the average outer diameter of the rotating body, the rotation angle of the material to be measured is relatively rotated while the non-contact type circumference measuring means is relatively rotated with the material to be measured. And measuring the circumference corresponding to the rotation angle, and calculating the average outer diameter of the material to be measured from the measured circumference and the rotation angle.

In an average outer diameter measuring device for measuring an average outer diameter of a rotating body during rotation, a rotating means for rotating the material to be measured and a circumference of the rotating material to be measured are measured in a non-contact manner. Circumference measuring means for measuring, a rotation angle measuring means for measuring a rotation angle of the material to be measured, and an outer diameter calculating means for calculating an average outer diameter of the material to be measured from the measured circumference and the rotation angle. Thus, the above-mentioned problem is also solved.

That is, by measuring the circumference of the material to be measured using a non-contact type circumference measuring means, for example, a laser Doppler length meter, the length can be measured during rotation such as cutting or polishing of the material to be measured. Yes, it can be applied to cutting machines and grinders and can be measured during continuous cutting.

Further, in order to recognize the rotation angle of the material to be measured, a means for marking the material to be measured is provided. For example, a marking such as a fluorescent paint or a flaw is placed on one end of the material to be measured or on an unprocessed outer periphery. By detecting the marking, the rotation angle of the material to be measured can be recognized without being restricted by the surface shape (curvature variation pattern of the outer periphery) and the surface accuracy of the material to be measured.

Further, by providing a copying means for keeping the distance between the surface of the material to be measured and the circumference measuring means constant, the distance between the material to be measured and the circumference measuring means can be kept constant. Thus, a practically usable measurement accuracy can be obtained.

In particular, when a laser Doppler length measuring device that detects the circumferential speed by the Doppler effect and integrates to obtain the circumferential length is used as the circumferential length measuring means, the distance between the material to be measured and the laser Doppler measuring length is measured. It is very important to keep constant.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In the present embodiment, as shown in FIG. 5, the present invention is applied to the measurement of the average outer diameter of the end 40A of the reinforced plastic composite pipe 40 when the end is cut.

In FIG. 5, reference numeral 40 denotes a reinforced plastic composite pipe of the material to be measured, 42 denotes a cutting cutter, and 44 and 46 denote rollers for rotating and supporting the material to be measured 40. Reference numeral 50 denotes a material to be measured 40 for detecting the number of rotations.
For example, the marking detection sensor 52 detects the number of rotations of the material to be measured 40 by marking such as a fluorescent paint applied to the end face 40E.

Reference numeral 60 denotes a length measuring sensor of a non-contact type length measuring device. The position of the length measuring sensor 60 is adjusted by moving the sensor base 62 up and down as shown by arrows.

The length measuring sensor 60 is brought into contact with the material to be measured 40 via a sphere 72 and, as shown in FIG. 6, applies pressure to the length measuring sensor 60 and presses it against the material to be measured. Copying mechanism 70 that keeps distance L to measurement material 40 constant
It has become.

When a laser Doppler length measuring device having a measuring principle shown in FIG. 7 is used as a non-contact type length measuring device, it is necessary to provide a distance between the workpiece 40 and the length measuring sensor 60 in order to obtain a practically usable measuring accuracy. It is important to keep the distance of
Sufficient measurement accuracy can be obtained by the copying mechanism 70 shown in FIG.

In FIG. 7, 60A is a semiconductor laser light source, 60B is a collimator lens block, 60C is a beam splitter, 60D is a mirror, and 60E is a material 4 to be measured.
A light receiving lens block for receiving scattered light from the zero surface, 60F is a photodetector, and 60G is an amplifier.

In such a laser Doppler length meter, the laser beam split by the beam splitter 60C is
The material to be measured 40 is irradiated at a predetermined intersection angle φ, and the scattered light from each beam undergoes a Doppler frequency change proportional to the speed of the surface of the material to be measured 40, and is heterodyne detected by the photodetector 60F. This Doppler frequency change f
Since D is proportional to the velocity V of the surface of the material to be measured 40,
The moving distance of the surface of the object to be measured, that is, the circumference is given by an integral value of the velocity, and is obtained by integrating the Doppler frequency with time. That is, the circumference is measured by integrating the wave numbers of the Doppler frequency.

Returning to FIG. 5, reference numeral 80 denotes a control / arithmetic unit which controls the length measurement based on a signal from the marking detection sensor 52 and controls the length measurement signal processing circuit 6 of the length measurement device.
4, the average outer diameter D of the material 40 to be measured is obtained.
Is calculated. The measurement result is printed out from the arithmetic and control unit 80 to a printer 82, and when the inspection standard is exceeded, an alarm display 84 notifies an operator of a rejected product.

Hereinafter, the measurement procedure will be described in detail with reference to FIG. In this embodiment, rough measurement is first performed while cutting, and continuous cutting is performed to a certain diameter. After that, rigorous measurement and micro-cutting are repeated by idle rotation to cut to a target size.

(Procedure 1) Preparation before measurement / cutting In step 100, after the workpiece 40 is set on the cutting machine, the sensor base 62 is moved up and down in step 102 to adjust the position of the length measuring sensor 60. Further, pressure is applied to the length measuring sensor 60 and pressed against the material to be measured 40 so that the distance L from the material to be measured 40 is constant.

Next, in step 104, marking is performed on the material to be measured 40, and when calculating the average outer diameter D, the number of measurements m for setting how many rotations of data are to be averaged, The set values of the upper limit value Dmax and the lower limit value Dmin of the inspection standard of the average outer diameter, and the approximate target value Ca of the circumference used at the time of the approximate measurement are input.

(Procedure 2) Rough Measurement In the rough measurement, in step 110, the circumference of the workpiece 40 is measured by a length measuring instrument while performing continuous cutting, and in step 112, the workpiece is continuously cut until it becomes equal to or less than the approximate target value Ca. here,
Recognition of one rotation of the material to be measured 40 is performed by detecting the marking 50 of the fluorescent paint by the marking detection sensor 52.
And

(Procedure 3) Strict Measurement and Pass / Fail Judgment In the strict measurement, the cutting is automatically stopped in step 114, the minute cutting is performed in step 118, and then, in step 120, the workpiece 40 is emptied without cutting. While rotating, the circumference is measured for a plurality of rotations, and the average outer diameter D is calculated by the following equation.

[0029]

(Equation 1) Here, m is the number of measurements for calculating the average outer diameter, and Ci is the i-th measurement circumference measured by the length meter.

Next, in steps 122 and 124, the measurement result D of the average outer diameter and the upper limit value Dmax and the lower limit value Dm of the inspection standard are obtained.
In is compared with each other to determine pass or fail.
If the test fails, the operator is notified at step 126 by an alarm display such as an alarm or a patrol light.

The transition from the rough measurement to the strict measurement is as follows.
It can be performed automatically according to the determination result of step 112 or manually. In the case of manual operation, the operator is notified of cutting stop.

In this embodiment, since the copying mechanism 70 using the ball 72 is provided, the average outer diameter can be accurately measured even when the outer peripheral surface of the material to be measured is not a perfect circle. Note that a copying mechanism using means other than a sphere may be provided, or the copying mechanism may be omitted when the outer peripheral surface of the material to be measured is very close to a perfect circle.

In the case of cutting only the end portion 40A of the material 40 to be measured as in the present embodiment, the marking 50 can be attached to the non-cut outer peripheral surface instead of the end surface 40E.

In the above embodiment, the present invention is applied to the measurement of the average outer diameter of the reinforced plastic composite pipe at the time of cutting the end, but the present invention is not limited to this. It is apparent that the present invention can be similarly applied to the case where the entire outer periphery of a general pipe or a cylinder other than the reinforced plastic composite pipe is cut.

[0035]

According to the present invention, the average outer diameter of the material to be measured can be measured during rotation such as cutting or polishing, and is applied to a cutting machine or a grinding machine, and is measured during continuous cutting. Becomes possible. Therefore, in the past, the operator had to measure the outer diameter of the material to be measured on a scale, so that the work load was increased and the dimensional quality was unstable. Can be stabilized.

In particular, when marking is provided on the outer circumference or end face of the material to be measured, the marking can be detected to accurately recognize the number of rotations of the material to be measured, and the surface shape (the outer circumference of the material to be measured) can be recognized. Curvature variation pattern) and surface accuracy,
The average outer diameter of the material to be measured can be measured.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of rotation detection in a UOE steel pipe circumference measuring device described in JP-A-4-340411.

FIG. 2 is a block diagram showing a configuration of the circumference measuring device.

FIG. 3 is a diagram showing an example of data of a displacement measuring device used in the circumference measuring device.

FIG. 4 is a diagram showing an example of an autocorrelation value.

FIG. 5 is a perspective view showing the overall configuration of the embodiment of the present invention.

FIG. 6 is a side view showing a copying mechanism used in the embodiment.

FIG. 7 is an optical path diagram showing the measurement principle of the laser Doppler length meter.

FIG. 8 is a flowchart showing an example of a measurement procedure of the embodiment.

[Explanation of symbols]

 40 ... Measurement material 42 ... Cutting cutter 44 ... Measurement material rotation roller 46 ... Measurement material support roller 50 ... Marking 52 ... Marking detection sensor 60 ... Length measurement sensor 64 ... Length measurement signal processing circuit 70 ... Following mechanism 80 ... Control / arithmetic device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshimi Fukutaka 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. DD20

Claims (4)

[Claims] 1. A rotation angle of a material to be measured and a circumference corresponding to the rotation angle are measured while relatively rotating a non-contact type circumference measuring means with the material to be measured, and the measured circumference is measured. And calculating the average outer diameter of the material to be measured from the rotation angle and the rotation angle. 2. An average outer diameter measuring device for measuring an average outer diameter of a rotating body during rotation, a rotating means for rotating the material to be measured, and a non-contact measurement of a circumference of the rotating material to be measured. Circumference measuring means for measuring, a rotation angle measuring means for measuring a rotation angle of the material to be measured, and an outer diameter calculating means for calculating an average outer diameter of the material to be measured from the measured circumference and the rotation angle. An average outer diameter measuring device for a rotating body. 3. An apparatus for measuring the average outer diameter of a rotating body according to claim 2, further comprising means for detecting a marking on the material to be measured in order to recognize the rotation angle of the material to be measured. 4. An apparatus for measuring the average outer diameter of a rotating body according to claim 2, further comprising a copying means for keeping the distance between the surface of the material to be measured and the circumference measuring means constant.