JPH1094831A - Pipe roundness correction method and apparatus - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method and an apparatus capable of easily and surely correcting a perfect circle of a pipe. SOLUTION: The inside diameter of a branch pipe 23 to be corrected is measured around the circumference by a measuring instrument 3, and based on the measured value, the inside of the branch pipe 23 is pushed toward the outer periphery and expanded.
Thereafter, the inner diameter of the branch pipe 23 expanded and expanded is compared with the data to be processed, and the operation of expanding the roller 2 and the measuring operation of the measuring device 3 are repeated until the data to be processed is obtained.
The work of straightening the branch pipe 23 can be automated. Moreover, when the measurement by the measuring device 3 and the pressing force by the roller 2 are repeated, there is no possibility that the branch pipe 23 is expanded beyond the desired diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for straightening a pipe into a perfect circle, and more particularly to a branch pipe as a pipe protruded by burring at an intermediate position of a mother pipe made of metal. The present invention relates to a method suitable for molding a high-precision.

[0002]

2. Description of the Related Art In general, pipe parts are often used as flow paths for liquids, gases, and the like. Particularly, in a pressure vessel or the like forming a fusion reactor of a nuclear power plant, secondary pipes such as burring are used. In some cases, a branch pipe is formed by processing, and then another pipe is connected to the branch pipe by welding or the like to form an assembly structure.

In this case, in the first prior art in which a branch pipe is formed in a pipe by burring, as shown in FIG. 5, a hole 22 is first opened at an intermediate position of a mother pipe 21 forming a pipe, and then this mother pipe is formed. After the mold 24 is put into the tube 21, the mold 24 is pulled out from the hole 22 of the mother tube 21, and the peripheral wall portion of the hole 22 protrudes from the mother tube 21 so that the branch tube 23 is formed to protrude. I have.

In the second prior art, as shown in FIG. 6, a forming tool 2 capable of expanding and contracting in a hole 22 of a mother pipe 21 is used.
5 is inserted in a folded state, and then withdrawn from the hole 22 while the forming tool 25 is expanded, thereby forming a branch pipe 23.
Is formed.

Further, in the third prior art, as shown in FIG. 7, a roller 26 that rotates and revolves around the axis of the branch pipe 23 is used, and the roller 26 is pushed and expanded along the periphery of the hole 22. Thereby, the branch pipe 23 is formed.

In any of the prior arts shown in FIGS. 5 to 7, when the branch pipe 23 is formed by burring, it is difficult to say that the roundness of the branch pipe 23 is good. That is, as shown in FIGS. 3 and 4, the branch pipe 23 generally includes a portion A on the long axis side parallel to the axis of the mother pipe 21 in the branch pipe 23 and a short axis orthogonal to the axis of the mother pipe 21. This results in an elliptical shape having a side portion B. In the elliptical shape, the rigidity of the short-axis side portion B is lower than that of the long-axis side portion A. Therefore, when performing an assembling operation for connecting the pipes, the operator performs the roundness correction by hand or the like using a jig (not shown) that sticks inside the pipe.

Further, as a fourth prior art, Japanese Patent Application Laid-Open
There is a technique disclosed in Japanese Patent Publication No. 246425. In this technique, as shown in FIG. 8, a plurality of spinning rollers 30 are provided on a support column 28 projecting from a rotating body 27 via a rotating arm 29, and as shown in FIG. The branch pipe 23 is expanded by contacting and rotating the inner peripheral surface of the branch pipe 23, or, although not shown, the branch pipe 23 is contracted by rotating by contacting the outer peripheral surface of the branch pipe 23, It is described that the branch pipe is thereby corrected for roundness.

[0008]

However, the prior art shown above does not consider the following points. That is, in the first to third conventional techniques shown in FIGS. 5 to 7, when the branch pipe 23 is formed by burring on the mother pipe 21, the branch pipe 23 is deformed as shown in FIG. In addition, since the correction is performed manually using a tensioning jig or the like, the correction requires a large number of man-hours, and the work is highly dependent on the operator.

In the fourth prior art, the branching pipe 23 is expanded by rotating the spinning roller 30 in contact with the inner or outer periphery of the branching pipe 23. There is a problem that the pressing force for operating the spinning roller 30 against the deformation of the inner circumference and the deformation of the outer circumference of the spinning roller 23 is not specifically specified. Moreover, in the fourth conventional technique, the spinning roller 30 comes into contact with the outer periphery of the branch pipe 23 so that the branch pipe 23
Although it is described that the diameter can be reduced, in practice,
It is difficult to reduce the diameter of the branch pipe 23 once formed without performing special processing such as heating, and it is difficult to put it into practical use.

An object of the present invention is to provide a method for straightening a pipe which can easily and surely correct the roundness of a pipe in view of the above-mentioned problems of the prior art. An object of the present invention is to provide a pipe roundness correction device capable of appropriately performing the above method.

[0011]

According to the method of the present invention,
In a pipe roundness correction method for correcting a pipe formed of one of a branch pipe protruding at an intermediate position of a base metal pipe and an end of a cylindrical pipe into a perfect circle, A) an inner diameter of a pipe to be corrected is determined. A measuring step of measuring around the circumference with a measuring device; B) a expanding step of expanding an inner peripheral portion of the pipe toward an outer peripheral direction based on the measured value; and C) measuring an inner diameter of the expanded pipe again. And D) comparing the data measured in the step with the desired data to be processed, and repeating the steps B) and C) until the data to be processed is obtained. is there.

In the apparatus of the present invention, the rotating shaft is arranged coaxially with the pipe, and is disposed at the same radial position as the axis of the pipe on the rotating shaft, and is in contact with the inner peripheral portion of the pipe. And a measuring device attached to the rotating shaft and capable of measuring the inside diameter of the pipe over the circumference when the rotating body rotates, and moving the roller along the radial direction of the pipe, On the other hand, based on the measurement result of the measuring device, a pressing force adjusting mechanism for pressing the roller in the outer circumferential direction,
Control means for controlling the roller pressing force adjusting mechanism and controlling the pressing force of the roller against the inner peripheral portion of the pipe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The method of the present invention can be applied to both the end of a simple long cylindrical pipe and the branch pipe 23 formed as a pipe in the mother pipe 21. In the present embodiment, the branch pipe 23 is used. It is described as an object. That is, one embodiment of a pipe roundness correction device for carrying out the method of the present invention is, as schematically shown in FIG. 1, a rotating shaft 1, a plurality of rollers 2, a measuring device 3, and a roller 3. And a second pressing force adjusting mechanism.

The rotating shaft 1 is arranged coaxially with the axis of the branch pipe 23 to be corrected, and is rotated by a driving source such as a step motor (not shown).

The roller 2 is for contacting the inner peripheral portion of the branch pipe 23 to increase the diameter of the branch pipe 23, and is provided on a disc-shaped base 4 fixed to the tip of the rotating shaft 1. And is disposed at a radial position around the axis of the rotating shaft 1. In this case, as shown in FIG. 1A, the plurality of rollers 2 are arranged on the base 4 so as to be equally spaced from each other (in this example, there are three rollers, so that they are spaced at 120 degrees).

The plurality of rollers 2 can be moved in the radial direction of the branch pipe 23 by a pressing force adjusting mechanism 5. That is, the pressing force adjusting mechanism 5 includes a motor 6 installed at the center on the distal end surface of the base 4, a screw shaft 7 having one end connected to the output shaft of the motor 6,
The other end of the screw shaft 7 is engaged with the roller 2.
And a guide 9 for slidably guiding the slide member 8 in the radial direction. When the screw shaft 7 rotates by driving the motor 6, the slide member 8 moves along the radial direction of the rotary shaft 1 on the guide 9, so that the roller 2 moves in the radial direction of the branch pipe 23. I have. Accordingly, the moving mechanism 4 can adjust the pressing force of the roller 2 against the inner peripheral portion of the branch pipe 23 by moving the roller 2 in the outer peripheral direction with respect to the inner peripheral portion of the branch pipe 23. I have.

In this embodiment, the measuring device 3 emits a specific light such as a laser beam or an infrared ray to the inner peripheral portion of the branch tube 23 and receives the rebounded light, thereby obtaining the inner diameter of the branch tube 23. , Which is mounted on a support unit 10 attached to the base 4 via a moving mechanism 11 so as to be movable in the radial direction. The moving mechanism 11 of the measuring device 3 includes a motor 12 attached to the support portion 10, and a reciprocating rod 1 that is provided so as to be able to advance and retreat in the radial direction by driving the motor 12, and that has the measuring device 3 attached to the tip end.
3 and the number corresponding to the number of the rollers 3 is provided. In addition, the motor 12 of each moving mechanism positions each of the measuring devices 3 at a predetermined position so that the measurement accuracy of the plurality of measuring devices 3 is not deviated.

Further, in the pipe roundness correction device,
The control unit 14 controls the pressing force against the inner peripheral portion of the branch pipe 23 based on the measurement result of the measuring device 3. The control unit 14 controls the rotation axis 1
When the measuring device 3 measures the inner diameter of the branch pipe 23 by the drive, the operation of the pressing force adjusting mechanism 5 of the paired rollers 2 is controlled based on the measured value, and the pressing force of the rollers 2 against the pipe inner diameter is controlled. Like that.
In this case, the plurality of measuring instruments 3 rotate only in the area covered by the inner circumference of the pipe, so that the inner diameter of the pipe is measured as a whole over the entire circumference. 11. For this reason, the control unit 11 takes in the measurement data of each measuring device 3 individually, and takes in the measurement data corresponding to each angle of each measuring device, and then, based on the taken data, the corresponding roller 2 The pressing force is controlled.

Therefore, the pipe roundness correction apparatus of the embodiment is
A rotating shaft 1 arranged coaxially with the branch pipe 23;
A plurality of rollers 2 disposed at a radial position about the axis of the measuring device 3, a measuring device 3 capable of measuring the inner diameter of the branch pipe 23 over the circumference thereof, and each roller 2 being connected to an inner peripheral portion of the branch pipe 23. A force adjusting mechanism 5 that presses the measuring device 3 in the outer circumferential direction, a moving mechanism 11 that can adjust the position of each measuring device 3 in the radial direction, and control that controls the pressing force of the roller 2 against the inner circumferential portion of the pipe based on the measurement result. And a part 14.

Since the pipe straightening method of the embodiment has the above-described configuration, an embodiment of the method of the present invention will be described next with reference to FIG. . At the time of the correction work, the branch pipe 23 provided on the mother pipe 21 is set in advance as shown in FIG.
It is assumed that the rotary shaft 1 is set in advance in the branch pipe 23 coaxially with the same. Then, in this state, as shown in FIG. 2, the material, diameter, and plate thickness of the mother pipe 21 and the branch pipe 23 are controlled by the operator.
Material, plate thickness, diameter of the value to be corrected and branch pipe 2
An elastic coefficient (plastic deformation force) at an arbitrary point 3 is input as data (step 41).

In this case, as the data of the elastic coefficient (plastic deformation force), for example, desired points of the branch pipe 23 are previously pressed by the roller 2, and at this time, how much pressing force is applied to each point of the branch pipe 23. Is performed to calculate data serving as a guide for determining whether each point of the branch pipe 23 obtains plastic deformation.

As described above, when the necessary processing data is input by the operator and the correction work is turned on, the control unit 14 drives the rotating shaft 1 and the measuring instrument 3 moves the inner circumference of the branch pipe 23 as indicated by an arrow. By rotating in the counterclockwise direction as described above, the inner diameter of the branch pipe is measured around the circumference (step 42). In this case, since the measuring devices 3 are provided at equal intervals corresponding to the rollers 2, the range of the area allocated in advance (in this example, since three measuring devices 3 and three rollers 2 are provided, 1
(20 degrees), the circumference of the branch pipe 23 can be measured. As a result, the control unit 14 sequentially captures the data of the inner diameter of the branch pipe 23 measured by each measuring device 3.

Next, when the measurement by the measuring devices 3 is completed, the control unit 14 drives the rotating shaft 1 again and controls the pressing force adjusting mechanism 5 based on the values measured by the measuring devices 3 at that time. Each measuring device 3 with which each roller 2 is paired
The branch pipe 23 is rotated while being pressed so as to expand the inner diameter portion measured in the step (b) to expand the diameter of the branch pipe 23 (step 43).

Thereafter, the control unit 14 further rotates the rotating shaft 1, measures the portion of the branch pipe 23 expanded by the roller 2 in the previous stage with the next measuring device 3, and processes the measured value. A comparison is made with the data (step 44).

In this case, the control unit 14 checks whether or not the branch pipe 23 has been processed according to the desired data (step 45). As a result, if the branch pipe 23 has been processed according to the data, the correction work is completed. . If the data is not processed according to the data, the control unit 14 repeats the processing from step 43 until the data is processed as the data.

In the method of the present invention, as described above, the inside diameter of the branch pipe 23 to be corrected is measured around the circumference by the measuring device 3, and based on the measured value, the inside of the branch pipe 23 is pushed toward the outer periphery. The inner diameter of the branch pipe 23 which has been expanded and then expanded is compared with the data to be processed.
Is repeated, so that the work of correcting the branch pipe 23 can be automated. Moreover, when the measurement by the measuring device 3 and the pressing force by the roller 2 are repeated, there is no possibility that the branch pipe 23 is expanded beyond the desired diameter.

As a result, compared with the first and second prior arts, it is not necessary for an operator to perform a manual correction using a tension jig or the like, so that the correction can be performed easily and reliably. Can be. Also, as compared with the third conventional technique of simply expanding by pressing the spinning roller, the pressing force of the roller is considered based on the measurement result of the measuring device,
The branch pipe can be corrected accurately according to desired processing data.

In the roundness correction device of the embodiment,
A rotating shaft 1 disposed coaxially with the branch pipe 23, a roller 2 disposed at the same radial position as the axis of the branch pipe 23 in the rotating shaft 1, Measuring device 3 for measuring the inner diameter of branch pipe 23 around the circumference during rotation
A pressing force adjusting mechanism 5 for pressing the roller 2 against the inner peripheral portion of the branch pipe 23 in the outer circumferential direction; and a pressing force adjusting mechanism 5 for the roller 2 based on the measurement result of the measuring device 3. And the control means 14 for controlling the pressing force of the roller against the inner peripheral portion of the roller, so that the method of the present invention can be accurately performed.

In addition, the control unit 14 performs
In addition to inputting in advance the material and plate thickness of the branch pipe 23 as data, the roller 2 is determined based on these data and the measured data in consideration of the plastic deformation force of the actual branch pipe 23 to be corrected.
Since the pressing force of the roller 2 is determined, it is possible to reliably prevent the roller 2 from being excessively expanded beyond a predetermined size by the roller 2,
Increase the reliability of the device.

Further, in the illustrated embodiment, three rollers 2 are disposed at equal intervals from each other, and a measuring device 3 is disposed at the same angle between the rollers 2.
Since both the measuring device 3 and the roller 2 are arranged at an equal angle on the circumference, it is possible to perform the measurement of the inner diameter of the branch pipe 23 and the adjustment of the pressing force over the entire circumference without rotating the rotating shaft 1 once. As a result, the correction work can be performed efficiently. Moreover, since the three rollers 2 are integrally formed on the base 4 via the respective pressing force adjusting mechanisms 5 so as to extend in the centripetal direction, when the rollers 2 are pushed and spread, the reaction force of the work is reduced. In addition to being able to stably obtain, the supporting strength of the roller 2 can be sufficiently maintained, and the possibility that an unbalanced pressing force is generated between the plurality of rollers can be eliminated.

In the illustrated embodiment, an example is shown in which a non-contact type using laser light or infrared light is used as the measuring device 3. Of course, a contact type that measures the inner diameter of 23 may be used. However, the contact-type measuring device may be any device provided with an elastic force so that the tip can follow the inner peripheral wall of the branch pipe.

In the illustrated embodiment, as described above, an example in which a plurality of rollers 2 and a plurality of measuring devices 3 are provided is shown. However, if at least one of each of them is provided, a correcting operation can be performed. Furthermore, in the illustrated embodiment, an example is shown in which the present invention is applied to a device that corrects the roundness of the branch pipe 23. However, not only the branch pipe 23 but also the end of a normal long cylindrical pipe is corrected. This can be applied to the case, and the same operation and effect as described above can be obtained, so that the versatility can be given accordingly.

[0033]

As described above, according to the first aspect of the present invention, the inside diameter of the pipe to be corrected is measured around the circumference by a measuring instrument, and the inner peripheral portion of the pipe is measured based on the measured value. Push and expand in the outer circumferential direction, and then compare the measured data of the inner diameter of the expanded branch pipe with the data to be processed. It is possible to automate the work of straightening the branch pipe because it was configured to repeat
This eliminates the need for manual correction as in the first to third prior arts and, unlike the fourth prior art, considers the pressing force of the roller based on the measurement result of the measuring device, resulting in a true pipe. There is an effect that circular correction can be performed easily and reliably.

According to the second and third aspects of the present invention, the method includes the rotating shaft, the roller, the measuring device, the pressing force adjusting mechanism for the roller, and the control means. effective. In particular, the control means has means for determining the pressing force of the roller based on the material and thickness of the pipe to be straightened, the plastic deformation force of the pipe to be straightened, and the data measured by the measuring device. Therefore, it is possible to reliably prevent the roller from being excessively expanded beyond a predetermined dimension by the roller, and it is possible to enhance the reliability of the apparatus.

[Brief description of the drawings]

FIG. 1 is a front view (a) and an explanatory view (b) of a cross-sectional side view showing an embodiment of a pipe roundness correction device for carrying out the method of the present invention.

FIG. 2 is a flowchart of a control unit showing one embodiment of the method of the present invention.

FIG. 3 is a front view showing a branch pipe formed by burring.

FIG. 4 is an overall sectional view showing a mother pipe in which a branch pipe is formed.

FIG. 5 is an explanatory view at the time of forming a branch pipe showing the first conventional technique.

FIG. 6 is an explanatory view at the time of forming a branch pipe according to a second conventional technique.

FIG. 7 is an explanatory view at the time of forming a branch pipe according to a third conventional technique.

FIG. 8 is an explanatory view showing a fourth conventional technique at the time of roundness correction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotary axis, 2 ... Roller, 3 ... Measuring device, 5 ... Pressing force adjustment mechanism for rollers, 11 ... Moving mechanism of measuring device, 14 ...
Control unit.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G01B 11/12 G01B 11/12 Z (72) Inventor Yasuhiro Nonaka 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant of Hitachi, Ltd. (72) Inventor Satoru Shirata 1-1-1, Kokubuncho, Hitachi, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Hiroshi Takeda 1-1-1, Kokubucho, Hitachi, Hitachi, Kokubu, Hitachi, Ltd. Inside the plant (72) Inventor Naoya Okada 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Yuki 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Inside the Kokubu Plant (72) Inventor Naohiro Tsukao 2-9-1, Aise-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Equipment Engineering Co., Ltd.

Claims (3)

[Claims] 1. A pipe roundness correcting method for correcting a pipe formed of one of a branch pipe protruding at an intermediate position of a base material pipe and an end of a cylindrical pipe into a perfect circle, comprising: A) straightening; A measuring step of measuring the inner diameter of the pipe to be spread over the circumference by a measuring device; B) a expanding step of expanding an inner peripheral portion of the pipe toward an outer peripheral direction based on the measured value; Measuring the inner diameter again; and D) comparing the data measured in the step with the desired data to be processed, and repeating the steps B) and C) until the data to be processed is as specified. Characterized pipe roundness correction method. 2. A device for correcting a pipe made of one of a branch pipe protruding at an intermediate position of a base metal pipe and an end of a cylindrical pipe into a perfect circle, and is arranged coaxially with the pipe. A rotating shaft, a roller disposed at the same radial position as the axis of the pipe in the rotating shaft, and capable of contacting the inner peripheral portion of the pipe; and A measuring device capable of measuring the inner diameter over the circumference, a pressing force adjusting mechanism for moving the roller along the radial direction of the pipe and pressing the roller in an outer peripheral direction against an inner peripheral portion of the pipe, and measuring the measuring device Control means for controlling a pressing force adjusting mechanism of the roller based on the result and controlling a pressing force of the roller against the inner peripheral portion of the pipe. 3. A device for correcting a pipe formed of one of a branch pipe protruding at an intermediate position of a base material pipe and an end of a cylindrical pipe into a perfect circle, which is arranged coaxially with the pipe. A rotating shaft, a roller attached to the rotating shaft and disposed at the same radial position as the axis of the pipe, and capable of contacting the inner peripheral portion of the pipe; and a roller attached to the rotating shaft and rotating the rotating body. A measuring device capable of measuring the inner diameter of the pipe around the circumference, a pressing force adjusting mechanism for moving the roller in the radial direction of the pipe and pressing the roller in the outer peripheral direction against the inner peripheral portion of the pipe, and a measuring device Control means for controlling the pressing force adjustment mechanism of the roller based on the measurement result of the roller, and controlling the pressing force of the roller against the inner peripheral portion of the pipe,
The control means has means for determining the pressing force of the roller based on the material and thickness of the pipe to be straightened, the plastic deformation force of the pipe to be straightened, and data measured by a measuring device. Pipe roundness correction device.