JPH03134506A - Ellipse measuring method and ellipse positioning method - Google Patents

Abstract

PURPOSE:To obtain an accurate ellitic amount X by adding each value in the range of 180 deg. - 360 deg. to each value in the range of 0 deg. - 180 deg. in rotary angles, obtaining the maximum value B in the added values, and computing the elliptic amount X=(A-B)/2. CONSTITUTION:Laser displacement gages 6 and 7 re provided in an object pipe 1. Under this state, supporting rollers 2 are driven with a servomotor 3. With the pipe 1 being rotated, the rotating angle of the pipe 1 is measured with an encoder 4. The displacements of the distances from the displacement gages 6 and 7 to the inner surface of the pipe 1 are measured at each rotating angle. The rotating angles and the displacement values l1 and l2 are transmitted to a control device 8. The displacement values l1 and l2 are added at every rotation in the device 8. The results are stored as the measured values. Each value yn in the range of 180 deg. - 360 deg. is added to each value xn in the range of 0 deg. - 180 deg. at the rotating angles. The maximum value A and the minimum value B of the added displacement values are obtained. The elliptic amount X=(A-B)/2 is computed based on the obtained values A and B. Thus, the accurate elliptic amount X can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ellipse measuring method for measuring the elliptical shape of a pipe such as a cast iron pipe, and an ellipse positioning method for positioning the measured pipe at a predetermined position in the circumferential direction.

BACKGROUND OF THE INVENTION Conventionally, some cast tubes have variations in roundness, and the elliptical shape of tubes that are not perfectly circular has been measured and elliptical correction has been carried out where necessary. As a method for measuring an ellipse shape and a device for correcting an ellipse, the present applicant has already filed an application (Japanese Patent Application No. 1-169194). , are placed in opposite directions inside the target pipe, and while rotating both displacement sensor parts once around the pipe axis,
The distance displacement from each displacement sensor section to the inner peripheral surface of the target pipe at each rotation angle is measured, and from the results, the amount of ellipse and the angle of the short axis and long axis are determined. The displacement values measured by each displacement sensor section are summed for each rotation angle, and among the summed displacement values, the maximum value A1 and minimum value B1 during the first half rotation (0° to 180') and the second half rotation Calculate the ellipse amount X = ((A1 + A2) - (Bl + B2)) / 2 from the maximum value A2 and minimum value B2 in (180° ~ 36G"), and also
According to this ellipse measurement method and ellipse positioning method, in which positioning is performed by detecting the angles that become the major axis and minor axis from each angle with L and B2, the target tube is
Measure each circumference, that is, twice in total, and calculate the ellipse amount X= ((A1+
Since A2)-(Bl+82))/2 is calculated, the errors in the measured values can be averaged and individual differences in accuracy of the displacement sensor parts can be almost eliminated.

Problem to be Solved by the Invention However, in the above conventional configuration,
Since the change shape of the summed value between 0 and the change shape between 180° and 360° is different, the angle at which the maximum value AI (or minimum value B1) during the first half rotation in the rotation angle is different from that during the second half rotation. The interval between the angle and the maximum value A2 (or minimum value B2) may not be 180°. in this case,
It is not possible to determine which angle point is the major axis (or minor axis), and the values detected at different measurement points (
The problem arises that the ellipse amount becomes inaccurate because the sum of the maximum value or the minimum value is performed.

The present invention solves the above problems, and aims to provide an ellipse measuring method that can always accurately detect the amount of ellipse, and an ellipse positioning method that can always accurately position the ellipse.

Means for Solving the Problems In order to solve the above problems, the ellipse measuring method of the present invention provides a pair of displacement sensor sections having optical axes that project light in the radial direction of the tube inside the target tube. While rotating the target tube once around the tube axis, measure the displacement of the distance from each displacement sensor part to the inner peripheral surface of the target tube at each rotation angle, and calculate the measured value as displacement. It is transmitted to a control device connected to the sensor section, and the control device sums up the displacement values measured by each displacement sensor section for each rotation angle, and converts them into multivalues from 0° to 180° at the rotation angle. 1
Add up the multi-values from 180'' to 360° shifted by 800 degrees, find the maximum value A and minimum value B of the summed displacement values, and from the obtained maximum value A and minimum value B, calculate the ellipse amount. X=(A-B)/2 is calculated, and the calculated ellipse amount X is taken as the measurement result.

In addition, the ellipse positioning method of the present invention includes
A pair of displacement sensor sections having optical axes emitting light in the radial direction of the tube are arranged facing in opposite directions, and while the target tube is rotated once around the tube axis, the distance from each displacement sensor section at each rotation angle is measured. The displacement of the distance to the inner circumferential surface of the target pipe is measured, the measured value is sent to the control device connected to the displacement sensor section, and the control device calculates the displacement value measured by each displacement sensor section at each rotation angle. In addition to adding up for each rule, 18 with a deviation of 1800 is added to the multi-value from 0 @ to 1800 at the rotation angle.
The multi-values from 0° to 3600 are each summed up and stored as a measured value, and the rotation angle where the measured value is the maximum value and the rotation angle where the measured value is the minimum value are determined, and the rotation angle is The target tube is rotated and positioned by the drive of support rollers.

Effect With the above configuration, each displacement sensor unit measures the distance to the inner surface of the target pipe one turn at a time, and the displacement values measured by each displacement sensor unit are summed, thereby eliminating individual differences in accuracy of the displacement sensor units. is almost eliminated, and the measured values are accurate. And, especially for multi-values from 0° to 1809 in rotation angle,
By summing the multi-values from 180° to 360° with a deviation of 1800 degrees, the displacement value of the diameter at the same position of the target tube can be calculated from 06 to Since the summation is performed for each angle of 1804, the error is further reduced, and the maximum value A of this value is
By calculating the ellipse amount X from the minimum value B, it is possible to obtain a more accurate ellipse amount It can be accurately rotated and positioned at a location corresponding to the major axis and minor axis of 1.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, a target pipe 1 made of a cast iron pipe is placed on a plurality of support rollers 2 in a sideways state. The support rollers 2 are arranged in parallel on the left and right, and are provided in pairs along the axial direction of the target tube 1, and the target tube 1 is disposed on the left and right support rollers 2. A servo motor 3 for rotational driving is provided on the support roller 2 at an appropriate location, and this servo motor 3 has an encoder 4.
is installed, and the servo motor 3 is controlled by this encoder 4.
The rotation angle of the target tube 1 can be detected via the support rollers 2 and the support rollers 2. In addition, a pair of laser displacement meters 6.7 is provided as a displacement sensor section at the tip of the rod 5 inserted into and extracted from the inside of the target tube 1, with the optical axes facing opposite directions. 6.7 is movable from one end of the target tube 1 to the other end by inserting and removing the rod 5 in the tube axis direction. In addition, encoder 4,
The laser displacement meter 6.7 and the servo motor 3 are each connected to a control device 28 via a signal line 9.

Next, the operation of the above configuration will be explained.

With the laser displacement gauges 6 and 7 disposed inside the target tube 1, the support roller 2 is driven by the servo motor 3 to rotate the target tube 1 around the tube axis. Then, while rotating the target tube 1 once, the rotation angle of the target tube 1 is measured by the encoder 4 interlocked with the support roller 2, and the inner peripheral surface of the target tube 1 is measured from each laser displacement meter 6, 7 at each rotation angle. The displacement of the distance up to n1. is measured, and the measured rotation angle and displacement value n1. A2 is sent to the control device 8. FIG. 3 and FIG. 4 show the rotation angle and displacement value transmitted to the control device 8, and the displacement value is recorded with one point from which the displacement measurement started as a reference. Then, in the control device 8, the displacement values fit, j22 measured by each laser displacement meter 6.7 are summed for each rotation angle and stored as a measured value. here,
Fig. 5 shows the rotation angle and measured values, and as shown in Fig. 5 and Fig. 6, the multi-value Xn of the rotation angle from 0° to 1800, Add up the values 3'n, find the maximum value A and minimum value B of the summed displacement values, and from the obtained maximum value A and minimum value B, the ellipse amount X = (A-B) / 2 is calculated, and the calculated ellipse amount X is taken as the measurement result. As a result, the measurement value for the entire circumference of the target tube 1 is measured once by each laser displacement meter 6, 7, and the laser displacement meter 6
．． 7 can be ignored, and in particular, 0
Add up the multivalues from 180° to 360° to the multivalued value X from 6 to 180°, that is, add up the measured values at the same point on the target pipe 1 using both laser displacement meters 6.7. Since the maximum value A and the minimum value B are determined, an accurate ellipse JIX can be determined. For example, as shown in FIG.
Even if the shape of change over 360° is different, the amount of ellipse X can be determined accurately. In addition, by detecting the rotation angles θ1θ2 that give the maximum value A and the minimum value B, and rotating the target tube 1 to these rotation angles using the support rollers 2, the target tube 1 can be adjusted to the major axis and the minor axis. It is possible to accurately position the corresponding angle, for example, the maximum angle (ifAt) at a rotation angle of 0° to 180°,
As shown in FIG. 6, the interval between the maximum value A2 and the angle at the rotation angle of 180° to 360° is not 111jO', but the maximum value A1. Even if A2 are not aligned at the same angle, an angle corresponding to the major axis can be obtained more easily and accurately than the angle of the maximum value A, regardless of these values AI and A2.

In addition, before measuring the distance with each laser displacement gauge 6.7, as a guide, rotate the target tube 1 so that the laser displacement gauges 6, 7 are positioned at a location that is considered to be the short diameter portion of the target tube 1. This has been done in the past, but it is difficult to judge because the curvature of the part near the short axis is small, so first search for the long axis part where the curvature is large, and then 90 mm from that point.
By rotating by °, it is possible to easily find a location where the short diameter of the target tube 1 is approximately the same.

Effects of the Invention As described above, according to the present invention, the displacement values measured by each displacement sensor section are summed for each rotation angle, and the multi-values from 04 to 180@ at the rotation angle are
By summing up the multi-values from 180° to 360'' with angle deviations, the amount of displacement measured once each round by the two displacement sensor sections is integrated for each angle from 0° to 180°. Since the maximum value A and the minimum value B are determined from these values, extremely accurate ellipse amount X and ellipse position can be determined.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing one embodiment of the present invention, FIG. 2 is an overall side view of the same embodiment, and FIGS. 3 and 4 are graphs showing the relationship between displacement value and rotation angle, respectively. 5 and 6 are graphs showing the relationship between measured calculated values and angles. DESCRIPTION OF SYMBOLS 1...Target pipe, 2...Support roller, 4...Encoder, 6.7...Laser displacement meter, 8...Control device. 3rd ward 4th cause 5th cause 2--1 support roller 1st time 3--1 trouble hsu a9 spy glass 1 place

Claims (1)

[Claims] 1. A pair of displacement sensor units having optical axes that project light in the radial direction of the tube are arranged inside the target tube, facing in opposite directions, and the target tube is moved around the tube axis. The displacement of the distance from each displacement sensor part to the inner circumferential surface of the target pipe at each rotation angle is measured while rotating once, and the measured value is sent to the control device connected to the displacement sensor part, and the control device The displacement positions measured by each displacement sensor section are summed for each rotation angle, and each value from 180 to 360 degrees, which is shifted by 180 degrees, is added to each value from 0 to 180 degrees at the rotation angle. Add up the values, find the maximum value A and minimum value B of the summed displacement values, and calculate the ellipse amount X = (A - B) / 2 from the obtained maximum value A and minimum value B. , an ellipse measurement method in which the calculated ellipse amount X is the measurement result. 2. A pair of displacement sensor units with optical axes emitting light in the tube radial direction are placed inside the target tube facing in opposite directions, and while rotating the target tube once around the tube axis, each Measures the displacement of the distance from each displacement sensor section to the inner peripheral surface of the target pipe at the rotation angle, transmits the measured value to the control device connected to the displacement sensor section, and measures it at each displacement sensor section in the control device. The measured displacement values are summed for each rotation angle, and each value from 180° to 360° shifted by 180° is added to each value from 0° to 180° at the rotation angle to obtain the measured value. An ellipse positioning method in which the rotation angle at which the measured value is the maximum value and the rotation angle at which the measured value is the minimum value are determined, and the target tube is rotated and positioned at the determined rotation angle by driving a support roller. .