JPH09269211A - Outer diameter measuring method and device for pipe body, bar body and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lead out more accurate roundness by supporting a pipe body, a tar body, or the like horizontally long in contact on freely rotatable free rollers and a driving roller, disposing a pair of contactless outer diameter measuring apparatus, and the like. SOLUTION: Two pairs of rollers each pair of which are provided radially having parallel shafts to each other are installed being axially spaced so as to rotate a pipe A in contact while supporting it horizontally long. Out of these four rollers, one roller is a driving roller 11 direct-coupled to an electric motor, and the remaining three rollers are freely rotatable free rollers 12. A contactless outer diameter measuring apparatus 5 by laser beams is installed consisting of a pair of projector 5a and light receiver 5b opposed on a diameter with the center axis of the pipe A held in between. Laser beams are parallelly scanned at uniform speed using a high speed rotating mirror or the like, and the dimensions of an object is obtained from the scanning speed during the time of scanning beams being intercepted by the object. The number of measuring points is thereby increased to measure the whole periphery so as to be able to measure true roundness.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method and an apparatus for measuring an outer diameter of a tubular body, a rod body or the like.

[0002]

2. Description of the Related Art The conventional method for measuring the outer diameter is to take a sample material of about 1 m and measure the outer diameter at four locations on the same axis-perpendicular cross section at intervals of about 45 degrees with a micrometer or the like. , I made judgments within and outside tolerances.

[0003]

However, since this method does not measure the entire circumference of the pipe, it is difficult to determine a subtle uneven portion, and conversely, it takes much time to measure the entire circumference. Further, the tightening pressure of the micrometer also varies personally, and some errors occur due to deformation due to the tightening pressure.

The present invention solves the above problems and derives a more accurate roundness by measuring without touching the pipe, and there is no individual difference in measuring the outer diameter of a pipe such as a thin pipe which is easily deformed. It is an object of the present invention to provide a method and a method for measuring an outer diameter of a tubular body, a rod or the like.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the structure of the present invention is as follows. That is, in the method of the first configuration, a tube body, a rod body, etc. having a central axis inclined with respect to the rotation axis of the free roll and the drive roll, which are freely rotatable, are supported horizontally for a long time. A pair of non-contact type outer diameter measuring devices that are diametrically opposed to each other with a central axis of a body, a rod or the like being sandwiched between them, instructing the drive roll to start or stop, and the rotation of the drive roll during the rotation. This is to output a measurement command signal to the outer diameter measuring device and store the measured value.

The device of the second structure has a rotation axis that is inclined with respect to the central axis of the tubular body, rod body, etc. so as to horizontally support the tubular body, rod body, etc., and they are parallel to each other. At least two pairs of rolls, which form a pair in the radial direction of the pipe body, rod body, etc., are axially separated from each other, and at least one of them is in contact with the pipe body, rod body, etc. A driving roll for rotating it, a free roll for the rest to be freely rotatable, a pair of non-contact type outer diameter measuring devices that are diametrically opposed to each other with the central axis of the tube body, rod body or the like interposed therebetween, Means for instructing the drive roll to start and stop, and outputting a measurement command signal to the outer diameter measuring device while the drive roll is rotating and storing the measured value.

[0007]

Embodiments of the present invention will be described below based on one embodiment shown in the drawings. 1 and 2 show an embodiment of a pipe outer diameter measuring device for carrying out the method of the present invention.
In order to support the pipe A horizontally for a long time and rotate it in contact with each other, two pairs of rolls are installed in parallel with each other in the radial direction so as to be axially separated from each other, and one of them is directly connected to the electric motor 9. The drive roll 11 and the remaining three rolls are free rolls 12 that can rotate freely.

A non-contact type outer diameter measuring device 5 using a laser beam, which is composed of a pair of a light emitter 5a and a light receiver 5b that are diametrically opposed to each other with the central axis of the pipe A interposed therebetween, is installed. A commercially available one is used for this measuring instrument (manufacturer / seller; Keyence Co., Ltd., 2-13 Akita-cho, Takatsuki-shi, Osaka, model number LS
-3100), its operating principle is well known, and "(new edition)
According to pages B3-42 to 43 of the Mechanical Engineering Handbook B3 “Measurement and Control” (edited by the Japan Society of Mechanical Engineers, Maruzen 1990), pages B3-42 to 43.

As shown in FIG. 3, the laser beam is scanned in parallel at a uniform speed using a high-speed rotating mirror or the like, and the size of the object is obtained from the scanning speed while the scanning beam is blocked by the object. Is. Now, let v be the scanning speed of the laser and ΔT be the time during which the scanning beam is blocked by the round bar.
Then, the diameter of the round bar is represented by D = vΔT.

This device uses a sequencer (programmable controller), and as shown in FIG. 4, the central processing unit 1 is the center of the storage device 2, the arithmetic unit 3, the input device 4, and the external device via the same. The diameter measuring devices 5 are connected to each other, and the display device 7, the printing device 8 and the driving means 9 are further connected via the output device 6.

The central processing unit 1 is mainly composed of a microprocessor, and the storage unit 2 is a read only memory (ROM) and a random access memory (RAM).
And stores a program that defines the operation procedure of the central processing unit 1 and data to be processed by the central processing unit 1. The number of measurement points C and the circumferential length RD of the drive roll 11 are stored in advance from the input device 4 here. These values can be changed by operating the input device 4.

The input device 4 can set and change the number of measurement points C and the driving roll circumference RD as described above, and can also instruct the display of the outer diameter, the maximum value, the minimum value, and the average value at each point. Can also be done. In response to the operation command from here, the central processing unit 1 cooperates with the storage unit 2, the arithmetic unit 3, etc. to cause the display unit 7 to display a numerical value.

The display device 7 is a two-dimensional screen display device using a liquid crystal display in this example, and is arranged at a position in front of the outer diameter measuring device 5 which is easy to see.

Next, the practice of the present invention using the above-described outer diameter measuring device will be described. Prior to carrying out the method of the present invention, for example, C
= 16 as the circumference of the drive roll 11, for example RD = 2
The roll rotation speed of 24 mm is, for example, 1 rev / m.
In is set in the storage device 2.

In response to a command from the operation of the input device 4, each device is caused to start the operation required for the outer diameter measurement display. The central processing unit 1 is made to read the outer diameter data from the outer diameter measuring device 5, and this is stored in the storage device 2.

Next, the operation of the central processing unit 1 in carrying out the method of the present invention will be described with reference to the flow chart shown in FIG. The pipe A is horizontally supported for a long time on the rolls 11 and 12. When the program starts, first, the outer diameter OD at the start point is measured (start S1), and the outer diameter information is multiplied by π to calculate the pipe circumference R (step S).
2) Calculate the pipe half circumference HR from the pipe circumference (step S3), divide the pipe half circumference by the number of measurement points C to calculate the rotation stop interval P (step S4), and calculate the rotation stop interval P. The roll rotation ratio r is calculated by dividing by the circumference RD of the drive roll (step S5), and the roll rotation ratio r is multiplied by 60 to calculate the roll rotation time T (seconds) (step S6).

Next, the drive roll is instructed to start / stop every T time according to the number of measurement points (step S7), and when the drive signal is received, the drive roll is rotated for T time (seconds) (step S8). ) Next, while the drive roll is stopped, a measurement command signal is output to the outer diameter measuring device and the measured value is stored (step S9). Then, the maximum value, the minimum value and the average value are calculated from the outer diameter measured value (step S1
0) Then, the calculated information is printed (step S11).

6, 7 and 8 show an embodiment in which the outer diameter is measured while the pipe A is being rotated in the axial direction while being rotated around its central axis. In FIG. 6, a roll having a rotation axis inclined with respect to the central axis of the pipe A so as to horizontally support the pipe A horizontally and making them parallel to each other forms a pair in the radial direction of the pipe, At least two pairs are installed axially separated. One of them becomes a drive roll 11a which comes into contact with the pipe and rotates it, and the rest becomes a free roll 12a which can freely rotate. As a result, an axial component force acts on the pipe in accordance with the inclination angle of the roll axis, and the pipe is fed in the axial direction while rotating. Further, as shown in the block diagram of FIG. 7, the analog recording device 10 is connected to the output device 6, and the other devices are configured similarly to the device shown in FIG.

Next, the operation of the central processing unit 1 in carrying out the method of the present invention will be described with reference to the flow chart shown in FIG. The pipe A is horizontally long supported on the rolls 11a and 12a. When the program starts, the drive roll 11a (drive device 9) is instructed to rotate (step S1), and then, while the drive roll is rotating, a measurement command signal is sent to the outer diameter measuring device to change the outer diameter D to The measurement is performed (step S2), the measured value is analog-outputted, and the analog measured value is recorded (step S3). Then, it is determined whether or not the pipe exits the measurement region, that is, whether or not the measurement target is present (0 ≧ outer diameter measurement value D) (step S4), and NO.
If so, continue measuring outer diameter, and if YES, drive roll 11a
The (driving device 9) is stopped (step S5), and the process ends.

The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the claims.

[0021]

According to the configuration of the present invention, the true roundness can be measured by increasing the number of measurement points and measuring the entire circumference. In addition, it became possible to perform measurements without deforming the thin-walled tube, eliminating individual differences. Furthermore, it is possible to measure the outer diameter of the standard length tube in the length direction,
Since it is possible to confirm dents and scratches in the length direction and the distance between the dents and scratches is known, the location of these occurrences can be specified.

[Brief description of drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a principle diagram of an outer diameter measuring device.

FIG. 4 is a microcomputer control block.

FIG. 5 is a control flowchart.

FIG. 6 is a plan view of another embodiment of the present invention.

FIG. 7 is a control block of another embodiment of the present invention.

FIG. 8 is a computer flowchart of another embodiment of the present invention.

[Explanation of symbols]

 1 Central Processing Unit 2 Storage Device 3 Computing Device 4 Input Device 5 Outer Diameter Measuring Device 6 Output Device 7 Display Device 8 Printing Device 9 Driving Device 10 Analog Recording Device 11 Driving Roll 12 Free Roll

Claims (2)

[Claims] 1. A tube body, a rod body, etc. having a central axis inclined with respect to the rotation axis of the free roll and the drive roll, which can be freely rotated, are horizontally supported for a long time, and the tube body, the rod. Arranging a pair of non-contact type outer diameter measuring devices that face each other across the center axis of the body or the like, instructing the drive roll to start and stop, the tubular body during rotation of the drive roll, A method for measuring an outer diameter of a pipe, a rod or the like, which includes outputting a measurement command signal to the outer diameter measuring device and storing the measured value while the rod is moving in the axial direction. 2. A tube having rotation axes inclined with respect to a central axis of the tube, rod or the like so as to horizontally support the tube, rod or the like, and making them parallel to each other. At least two pairs of rolls, such as a body and a rod, which form a pair in the radial direction are axially separated from each other, and at least one of them is brought into contact with the pipe or rod to rotate it. Drive roll, a free roll with the rest freely rotatable, a pair of non-contact type outer diameter measuring devices diametrically opposed to each other with the central axis of the tube body, rod body, or the like interposed between the drive roll and the drive roll. Outer diameter measurement of a pipe body, rod body, etc., characterized by including means for instructing stoppage and means for outputting a measurement command signal to the outer diameter measuring device while the drive roll is rotating and storing the measured value. apparatus.