EP4634611A1 - Verfahren, messanordnung und system zur vermessung einer innenkontur, insbesondere eines innengewindes an einer muffe oder einem muffenende eines rohres - Google Patents
Verfahren, messanordnung und system zur vermessung einer innenkontur, insbesondere eines innengewindes an einer muffe oder einem muffenende eines rohresInfo
- Publication number
- EP4634611A1 EP4634611A1 EP23775976.6A EP23775976A EP4634611A1 EP 4634611 A1 EP4634611 A1 EP 4634611A1 EP 23775976 A EP23775976 A EP 23775976A EP 4634611 A1 EP4634611 A1 EP 4634611A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- pipe
- sensor
- sensors
- internal thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2425—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures of screw-threads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
Definitions
- the invention relates to a method for measuring an inner contour, in particular an internal thread on a socket or a socket end of a pipe.
- the invention further relates to a measuring arrangement for measuring an inner contour, in particular an internal thread on a socket or a socket end of a pipe, in particular for carrying out the method, and a measuring system for measuring an inner contour, in particular an internal thread on a socket or a socket end of a pipe, which is designed in particular for carrying out the method and which comprises a measuring arrangement of the type described above.
- pressurized fluids such as natural gas or crude oil
- conical threads with undercut thread flanks are usually used.
- the threads are usually followed by a sealing lip on the front side of the pipe. Both the thread and the sealing lip must meet the highest precision requirements.
- the measurement of external threads on pipes is unproblematic as the external thread is easily accessible from the outside and can be measured both contactlessly and with tactile sensors.
- the measurement of internal threads is more difficult due to the poorer accessibility of the internal threads.
- the threads can be measured using tactile measuring devices, for example thread gauges or feeler needles.
- measuring the internal thread on pipes with a relatively small diameter is difficult because the inside width of the pipe only allows the insertion of a single sensor.
- To determine the internal diameter which is required to map the thread profile, at least two, ideally three measuring points must be recorded. If optical sensors that scan the internal thread without contact are to be used, the relatively small distance between the sensor and the thread inside the pipe also causes problems.
- internal thread measurement is often associated with the difficulty that the inner diameter of the pipe is not always concentric with the outer diameter, particularly due to the manufacturing process, for example in the case of seamless rolled pipes. Therefore, for internal thread measurement it is necessary to determine the inner diameter or the position of the inner diameter relative to the outer diameter.
- a method and a device for optically measuring the external thread profile of pipes is known, for example, from WO 2019/09371 A1.
- WO 2012/069154 A1 a method and a device for inspecting the external thread of an oil field pipe are known, wherein the device comprises a sensor guided on a frame and wherein the sensor is arranged on a threaded carrier, the thread of which is designed according to the thread of the pipe and which forms part of the conical thread of the pipe to be inspected.
- the sensor is designed as a confocal sensor.
- a device for measuring threads on oil field pipes is also known from WO 2020/232041 A1.
- the device comprises a sensor unit which is designed to measure a distance between the sensor and a part of the thread of the metal pipe.
- the sensor or the sensor unit can be adjusted radially and axially with respect to the internal thread of the metal pipe using a large number of actuators, whereby a control device can generate a three-dimensional image of the internal thread from a large number of distance measurements.
- the sensor unit comprises a confocal chromatic sensor which is placed on a rod into the metal pipe and is centered there within the metal pipe by means of sensing rollers. After concentric alignment of the guide rod of the rod, the sensor is adjusted both translationally and rotationally within the metal pipe, whereby the thread is scanned and a three-dimensional image of the thread is generated using the measurement data thus obtained.
- the arrangement known from WO 2020/232041 A1 is not readily suitable for pipes with a small inner diameter.
- the tactile centering of the measuring arrangement is complex and requires a relatively large amount of installation space.
- the field of view of the sensor is aligned at a predetermined angle to the longitudinal axis of the metal pipe and the rod to which the sensor is attached can be actuated by means of three different actuators, with one actuator for the rotary movement of the rod about its own longitudinal axis, one actuator for a rotational movement of the rod about the longitudinal axis of the metal pipe and one actuator for a linear movement of the rod within the metal pipe, i.e. parallel to the longitudinal axis of the metal pipe. Scanning undercut and/or conical threads is difficult with this arrangement.
- CN 112871737 A discloses a contactless sensor-based measurement method for internal threads in pipes, in which the position of the axis of symmetry of the external thread and the position of the axis of symmetry of the internal thread relative to that of the external thread are first determined. To this end, CN 112871737 A proposes rotating the pipe to be measured around its own axis using a sensor aligned in the longitudinal direction of the pipe and measuring the axis offset. Alternatively, it is provided to clamp the pipe and determine the position of the axes relative to one another in a centering device by adjusting the clamp accordingly. The internal thread is detected by guiding the optical sensor along the previously determined longitudinal axis of the inner diameter of the pipe.
- the invention is based on the object of providing a method, a measuring arrangement and a system that enable optical, contactless measurement of the internal thread on pipes, in particular on metal pipes with a small internal diameter.
- the method should be designed in such a way that it can be carried out with only one sensor on the inside of the pipe.
- the object is achieved by providing a method with the features of claim 1 and by providing a measuring arrangement with the features of claim 11. Furthermore, according to the invention, a measuring system with the features of claim 13 is provided.
- a first aspect of the invention relates to a method for measuring an inner contour, in particular an internal thread on a socket or a socket end of a pipe using a measuring arrangement with at least two sensors, wherein the measuring arrangement comprises a first inner sensor and at least one second outer sensor, wherein the first inner sensor and the second outer sensor are arranged at least radially with a defined distance from one another with respect to a longitudinal axis of the pipe, wherein the measuring arrangement is arranged with respect to the socket or the socket end of the pipe such that the first sensor detects the inside of the pipe and that the second sensor detects the outside of the pipe, wherein the method comprises that the first sensor scans the internal thread at least in a first measuring run along a first measuring section parallel to a longitudinal axis of the pipe, wherein the measuring signals of the second outer sensor determine the outside diameter of the pipe as a reference for the measuring signal of the first sensor, and wherein the recorded measured values are stored and/or processed with means for electronic data processing for
- internal thread in the sense of the invention also includes threadless sections of the socket, in particular a sealing lip provided on OTCG pipes.
- the measurement of the internal thread can be coupled in particular with an automated thread cutting process of a machine tool.
- the method according to the invention uses a preferably closed control loop between the machining of the metal pipe and the thread measurement, whereby a direct evaluation and derivation of Control commands for the machine tool are carried out depending on the comparison of the recorded actual thread profile with a target thread profile.
- a control device for evaluating and deriving control commands can comprise at least one self-learning algorithm for deriving the control commands.
- the pipe can be rotated around its longitudinal axis during a measurement run. If the pipe is rotated precisely around its longitudinal axis, exactly two sensors arranged inside and outside at a defined distance from each other are sufficient to determine the diameter of the pipe and determine the contour.
- the fine thread structure including the tooth height, the tooth width, the flank angle, the rounding angle and the pitch is precisely determined according to the invention.
- the exact position of the internal thread in space ie the position of the inner diameter in relation to the outer diameter of the pipe, can be clearly and precisely determined.
- At least three measuring points are advantageous for this. This can be achieved, for example, with two sensors if the pipe is rotated around its longitudinal axis.
- an internal sensor and several external sensors are provided, which are preferably mechanically connected to one another and have a precisely defined radial distance from one another.
- the external diameter of the pipe determined by the external sensor system forms a reference for the measurement signal of the internal sensor.
- the measuring arrangement comprises at least one third external sensor, which also has a defined radial distance from the first and second sensors and which also detects the outside of the pipe.
- the method can also be carried out with satisfactory results if only two measuring points are recorded on the outer circumference of the pipe.
- the inner sensor and the outer sensors are preferably moved parallel to each other in the longitudinal direction of the pipe during a measuring run.
- the measuring arrangement can be designed in such a way that the radial distance between the inner and the outer sensor(s) is changed according to the conicity of the sleeve during a measuring run in the longitudinal direction of the pipe. This ensures that over the length of a measuring section on each pipe cross-section there is a correspondingly large distance between the sensors so that the measurement can be carried out with the appropriate accuracy.
- a distance calibration of the sensors can be carried out at the beginning and end of a designated reference section, for example on a reference object.
- the radial distance between the sensors ie the distance of the inner sensor to that of the at least one outer sensor, can be adjusted.
- the radial The distance between the outer sensors is adjustable. The inner sensor and/or the at least one outer sensor can be moved radially.
- the measuring arrangement according to the invention preferably comprises a measuring head that can be moved relative to the pipe.
- the measuring head can, for example, comprise at least two sensors or measuring arms with sensors that are arranged on the outer circumference of the pipe and that are adjusted in the manner of a fork or pliers by means of at least one linear drive to vary the distance between the inner sensor and the outer sensors.
- the internal thread of the pipe is scanned along a second measuring section parallel to the longitudinal axis of the pipe, wherein the second measuring run is carried out along a measuring section with an angular offset relative to the circumference of the pipe.
- the measurement of the internal thread can be carried out using a large number of measurement runs that are carried out with an angular offset relative to the circumference of the pipe. It is preferable to carry out two measurements, each with an angular offset of 180° relative to the circumference of the pipe. Alternatively, three measurement runs can be carried out with an angular offset of 120 degrees.
- the method preferably comprises the step of calibrating the radial distance between all sensors, for example using a reference object.
- the reference object can be a sample pipe or test specimen with dimensions of defined tolerance.
- the method can be carried out using an internal optical sensor and using one or more tactile external sensors.
- at least the first and second sensors are optical sensors selected from a group of sensors comprising laser scanners, sensors designed for laser triangulation, laser micrometers or light band micrometers, telecentric measuring arrangements with at least one light-sensitive sensor, for example as a CMOS or CCD and at least one light source for backlighting an object to be measured, and confocal displacement measuring sensors, in particular confocal chromatic displacement measuring sensors.
- An optical sensor in the sense of the present invention is also understood to mean an arrangement of several optical elements in a measuring section.
- the first inner sensor can be designed as a confocal chromatic displacement sensor
- two second outer sensors can be designed, for example, as light section sensors.
- the inner sensor can be designed, for example, in combination with another optical element, for example in the form of a mirror adjustable about at least one axis, so that an elongated inner sensor can be arranged inside the tube, which is parallel to the longitudinal axis of the tube and which, with the mirror, enables scanning of the inner wall of the pipe at a right angle to the longitudinal axis of the pipe.
- the optical element can be designed as a so-called galvo scanner, the mirror of which is designed to be rotatable and pivotable relative to the optical axis, so that at least a partial circumference of the internal thread of the metal pipe can be optically scanned.
- the signal detected by the mirror of the optical element is transmitted to the sensor in the optical axis of the arrangement.
- the measuring arrangement according to the invention which is preferably designed to carry out the method, expediently comprises a first optical inner sensor and at least two second outer, preferably optical sensors, which are arranged at a defined and preferably calibrated distance from one another, wherein the arrangement is arranged to be movable linearly and along a measuring axis over a defined measuring distance and to be rotatable about the measuring axis during a measuring run.
- the radial distance between the sensors is preferably adjustable, further preferably by means of at least one electromotor actuator, so that in particular the arrangement of the second outer sensors relative to one another can be adjusted with respect to the nominal diameter of the pipes to be measured.
- a measuring system for measuring an internal thread on a socket or a socket end of a pipe which is designed, suitable and intended for carrying out the method, comprising at least one frame which accommodates an optical bench with a measuring arrangement of the type described above, wherein the optical bench and/or the frame can be adjusted at least linearly in the longitudinal axis or parallel to a longitudinal axis of the pipe by means of at least one drive, and with at least one data processing and data storage device with which the thread profile of the internal thread can be partially or completely displayed.
- the optical bench and/or the frame can be adjusted at least linearly in the longitudinal axis or parallel to a longitudinal axis of the pipe by means of at least one drive, and with at least one data processing and data storage device with which the thread profile of the internal thread can be partially or completely displayed.
- FIG. 1 is a schematic representation of the measuring principle according to the invention
- FIG. 2 is a highly simplified schematic representation of the measuring arrangement according to the invention.
- Figure 3 is a representation according to Figure 2, in which the measuring arrangement is rotated by 180°.
- Figure 1 shows a highly simplified view of a socket end of a pipe 1 with an internal thread 2, which is scanned with a first internal sensor 3 and two second external sensors 4.
- the pipe 1 is designed as a metal pipe, for example as a seamless rolled metal pipe with a conical internal thread, and is only shown in very basic terms for the sake of simplicity.
- the first internal sensor 3 and the second external sensors 4 are part of a measuring arrangement shown only schematically in Figures 2 and 3 and can be part of a measuring head which can be moved along a measuring axis 6 of a measuring section in the direction of the arrow shown in Figure 1 parallel to the longitudinal axis of the pipe 1 and is arranged so as to be rotatable about the corresponding axis.
- the terms inside and outside in this context refer to the position of the sensors 3, 4 during the measuring process or in a position ready for measurement in relation to the pipe 1.
- the second external sensors 4 which are located on diametrically opposite sides of the Outer casing 5 of the metal pipe 1
- the outer diameter of the pipe 1 is recorded as a reference for the measurement signal of the first inner sensor 3.
- the first inner sensor 3 is moved into the pipe 1 over a predetermined distance along the measuring axis 6 during a measurement run and scans the internal thread of the pipe 1 optically, i.e. without contact.
- the first inner sensor 3 and the outer sensors 4 are moved in parallel, i.e.
- the sensors 3 and 4 are arranged in a measuring arrangement shown schematically in Figures 2 and 3 with a fixed axial and radial distance from one another.
- the first inner sensor 3 can be designed as a confocal sensor with a further optical element in the form of a mirror 7, so that the sensor 3 can have a radiation source aligned in the direction of the measuring axis 6, which is deflected by the mirror 7 at an adjustable angle, so that scanning of the internal thread 2 of the tube 1 is possible in a relatively small installation space.
- the inner sensor 3 can also be designed as a laser scanner or as another measuring device for detecting the inner contour of the pipe 1 with a different measuring characteristic.
- the measuring arrangement shown in the drawings is designed with two measuring channels.
- the person skilled in the art will recognize that the measuring arrangement can have more than two channels, thereby increasing the measuring accuracy.
- FIG. 2 and 3 shows, for example, two diametrically opposed outer sensors 4, each of which has a telecentric optic with a light-sensitive sensor (receiver), for example a CMOS or a CCD sensor.
- a light source 8 is arranged opposite each of the light-sensitive sensors, which generates a projection of a part of the outer casing 5 of the pipe 1 onto the light-sensitive sensor 4.
- the use of telecentric lenses ensures that the projection recorded by the respective sensor 4 can be recorded undistorted and true to scale.
- the measurement data recorded in this way by the second outer sensors 4 are used to record the outer diameter of the pipe 1 in relation to the distance to the internal thread 2 or to the inner casing of the pipe 1 determined by the inner sensor 3.
- the measuring arrangement is rotated by 180° and the first inner sensor 3 scans the internal thread 2 of the pipe 1 in the diametrically opposite location in relation to the external diameter of the pipe 1 determined by the second outer sensors 4.
- All sensors 3, 4 have a precisely defined radial distance from one another, which was preferably calibrated using a test specimen before the start of the measurement.
- the measuring arrangement comprising the first inner sensor 3 and the second outer sensors 4, which are arranged together on a rotatable measuring head, was rotated completely from the position shown in Figure 2 to the position shown in Figure 3 in the described embodiment, whereby a measurement can be carried out intermittently in each case at distinct angular positions or continuously during the rotational movement of the arrangement of sensors 3 and 4.
- the entire arrangement can be moved back and forth linearly in the direction of the longitudinal axis of the pipe 1 and can also be rotated about the longitudinal axis of the pipe 1. It can be provided that both the radial distance and the axial distance of the sensors 3 and 4 from one another are fixed in an unchangeable manner at least during the measuring runs. If the conicity of the pipe 1 in the area of the socket exceeds a certain level, it can be advantageous to adjust at least one of the sensors 3, 4 during the measurement runs, ie to adjust it radially in a defined manner via a linear guide in order to increase the measuring range of the sensors 3, 4.
- the radial distance between the second outer sensors 4 can also be designed to be variable, for example, to adapt to different pipe diameters.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022213730.2A DE102022213730A1 (de) | 2022-12-15 | 2022-12-15 | Verfahren, Messanordnung und System zur Vermessung einer Innenkontur, insbesondere eines Innengewindes an einer Muffe oder einem Muffenende eines Rohres |
| PCT/EP2023/075610 WO2024125838A1 (de) | 2022-12-15 | 2023-09-18 | Verfahren, messanordnung und system zur vermessung einer innenkontur, insbesondere eines innengewindes an einer muffe oder einem muffenende eines rohres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4634611A1 true EP4634611A1 (de) | 2025-10-22 |
Family
ID=88146742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23775976.6A Pending EP4634611A1 (de) | 2022-12-15 | 2023-09-18 | Verfahren, messanordnung und system zur vermessung einer innenkontur, insbesondere eines innengewindes an einer muffe oder einem muffenende eines rohres |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4634611A1 (de) |
| DE (1) | DE102022213730A1 (de) |
| WO (1) | WO2024125838A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021208378A1 (de) * | 2021-08-03 | 2023-02-09 | Sms Group Gmbh | Anordnung zur optischen Vermessung eines Gewindes an einem Ende eines Metallrohres oder an einer Muffe sowie Verfahren zur Vermessung |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8743378B2 (en) * | 2008-05-01 | 2014-06-03 | Kabushiki Kaisha Bridgestone | Apparatus and method for measuring cylindrically-shaped object and apparatus for inspecting tire appearance |
| FR2968073B1 (fr) | 2010-11-26 | 2012-11-16 | Vallourec Mannesmann Oil & Gas | Procede et dispositif de controle d'un filetage de joint tubulaire utilise dans l'industrie du petrole |
| CN103144034B (zh) * | 2013-02-07 | 2015-04-29 | 常州工学院 | 平面共轭凸轮轮廓检测和磨削加工装置的控制方法 |
| WO2018013715A2 (en) * | 2016-07-12 | 2018-01-18 | U.S. Steel Tubular Products, Inc. | Methods and systems for measurement and inspection of tubular goods |
| JP2019002725A (ja) * | 2017-06-13 | 2019-01-10 | コニカミノルタ株式会社 | 欠陥検査装置 |
| WO2019009371A1 (ja) | 2017-07-07 | 2019-01-10 | Seiオプティフロンティア株式会社 | 融着接続装置、融着接続装置の盗難検知システム、及び、融着接続装置の盗難検知方法 |
| JP7087885B2 (ja) * | 2018-09-27 | 2022-06-21 | 日立金属株式会社 | 計測システムおよび穴付きシャフトの製造方法 |
| WO2020232041A1 (en) | 2019-05-14 | 2020-11-19 | Schlumberger Technology Corporation | On-machine thread inspection apparatus and method |
| CN112871737B (zh) | 2021-01-12 | 2022-06-28 | 中煤科工集团西安研究院有限公司 | 基于传感器的管件内螺纹检测方法、管件筛选方法及系统 |
| CN214149155U (zh) * | 2021-02-02 | 2021-09-07 | 西安捷创测控技术有限公司 | 一种油管接箍内螺纹参数测量装置 |
-
2022
- 2022-12-15 DE DE102022213730.2A patent/DE102022213730A1/de active Pending
-
2023
- 2023-09-18 EP EP23775976.6A patent/EP4634611A1/de active Pending
- 2023-09-18 WO PCT/EP2023/075610 patent/WO2024125838A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024125838A1 (de) | 2024-06-20 |
| DE102022213730A1 (de) | 2024-06-20 |
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