WO2024070241A1 - Procédé de mesure de jeu, dispositif de mesure de jeu, procédé de mesure de joint à vis, système de mesure de joint à vis, terminal de mesure, procédé de fabrication de joint fileté et procédé de gestion de qualité de joint fileté - Google Patents

Procédé de mesure de jeu, dispositif de mesure de jeu, procédé de mesure de joint à vis, système de mesure de joint à vis, terminal de mesure, procédé de fabrication de joint fileté et procédé de gestion de qualité de joint fileté Download PDF

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Publication number
WO2024070241A1
WO2024070241A1 PCT/JP2023/028725 JP2023028725W WO2024070241A1 WO 2024070241 A1 WO2024070241 A1 WO 2024070241A1 JP 2023028725 W JP2023028725 W JP 2023028725W WO 2024070241 A1 WO2024070241 A1 WO 2024070241A1
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WIPO (PCT)
Prior art keywords
joint
clearance
thread
measurement
male
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PCT/JP2023/028725
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English (en)
Japanese (ja)
Inventor
雄登 大場
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Publication of WO2024070241A1 publication Critical patent/WO2024070241A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile

Definitions

  • the present invention relates to a clearance measurement method, a clearance measurement device, a threaded joint measurement method, a threaded joint measurement system, a measurement terminal, a threaded joint manufacturing method, and a threaded joint quality control method in a pipe joint structure for joining pipes.
  • pipe structures used for the foundations of structures and to prevent landslides can require lengths of several tens of meters depending on the construction conditions. This tendency is particularly pronounced for steel pipes.
  • traffic restrictions mean that long pipes cannot be transported. For this reason, they are transported in transportable lengths of several meters at a time, and are joined at the construction site during construction (including pouring).
  • Threaded joints are used as a method for joining pipe structures at the construction site, and an example of such a threaded joint is disclosed in Patent Document 1.
  • the threaded joints are attached to the ends of the pipes to be joined, and are rotated at the construction site to join the pipes and construct the pipe structure.
  • threaded joints are shipped to the site with the male joint attached to one pipe and the female joint attached to the other pipe at the factory. There are several manufacturing procedures, but they are often manufactured as a set of male and female joints. After manufacturing, these sets of joints may be attached to the ends of long pipes depending on their intended use.
  • the joint Since the suitability of a threaded joint is determined by the corresponding thread shapes of the male and female joints that mate with each other, the joint is usually checked before use.
  • the threaded joint has a large diameter of 700 mm or more, when the pipe to which the threaded joint is connected is long (5 m or more), or when the threaded joint or the connected pipe is made of heavy metal such as steel, checking the joint is difficult. In this case, there are problems such as the significant effort required for checking the joint, the risk of damage to the joint itself, and concerns about ensuring safety.
  • the present invention has been made in consideration of the above, and its purpose is to provide a clearance measurement method, a clearance measurement device, a measurement method for a threaded joint, a measurement system for a threaded joint, a measurement terminal, a manufacturing method for a threaded joint, and a quality control method for a threaded joint, which allow for easier confirmation of the connection in a threaded joint regardless of the state of the threaded joint or the connected pipe.
  • a clearance measurement method for measuring the clearance between the threads of a male joint and the threads of a female joint for a set of threaded joints having a male joint and a female joint corresponding to the male joint, comprising: a joining completion state setting step for setting a joining completion state in which joining of the male joint and the female joint is completed based on data on the respective thread shapes of the male joint and the female joint; a clearance measurement step for measuring the clearance between the threads of the male joint and the threads of the female joint corresponding to the threads of the male joint in the joining completion state; and a rotation state setting step for setting a state in which the male joint and the female joint are rotated a predetermined angle in the direction of releasing the joint if the joint between the male joint and the female joint is not in a disengaged state after the clearance measurement step, and the steps from the clearance measurement step to the rotation state setting step are repeatedly executed until the joint is
  • the clearance measurement method according to the invention described in (1) above includes at least one of the steps of: determining whether the set of threaded joints is pass or fail based on the clearance measured in the clearance measurement step and a predetermined criterion; and, for a location determined to be an interference location based on the clearance measured in the clearance measurement step and the predetermined criterion, providing information about the interference location.
  • a method for measuring a threaded joint includes a shape measurement process for measuring the thread shape of a male joint and the thread shape of a female joint corresponding to the male joint for a set of threaded joints, and a clearance measurement process for measuring the clearance for each set of threaded joints using the clearance measurement method according to the above-described invention based on the data of the thread shape measured in the shape measurement process.
  • the method for manufacturing a threaded joint according to the present invention is a method for manufacturing a threaded joint set having a male joint and a female joint corresponding to the male joint, and includes a joint manufacturing process for manufacturing the threaded joint, and a joint measurement process for carrying out the threaded joint measurement method according to the invention described in (3) on the threaded joint set having a male joint and a female joint produced by the joint manufacturing process.
  • a quality control method for a threaded joint is a quality control method for a threaded joint that controls the quality of a set of threaded joints having a male joint and a female joint corresponding to the male joint, and includes a joint manufacturing process for manufacturing the threaded joint, a joint measurement process for measuring the thread shape of the set of threaded joints created by the joint manufacturing process using the threaded joint measurement method according to the invention described in (3), and a quality control process for controlling the quality of the created threaded joint using the results obtained from the joint measurement process.
  • a clearance measurement device is a clearance measurement device that measures the clearance between the threads of a male joint and the threads of a female joint for a set of threaded joints having a male joint and a female joint corresponding to the male joint, and is equipped with a control unit that repeatedly executes the following steps until the joint is released: a joining completion state setting process that sets a joining completion state in which the joining of the male joint and the female joint is completed based on data on the respective thread shapes of the male joint and the female joint; a clearance measurement process that measures the clearance between the threads of the male joint and the threads of the female joint corresponding to the threads of the male joint in the joining completion state; and a rotation state setting process that sets a state in which the male joint and the female joint are rotated a predetermined angle in the direction of releasing the joint if the joint between the male joint and the female joint is not released after the clearance measurement step.
  • the clearance measurement device is the invention described in (6), in which the control unit executes a clearance measurement process to measure the clearance between the threads of the male joint and the threads of the female joint that correspond to the threads of the male joint in the joining completion state before the rotation state setting process.
  • the clearance measurement device further includes a communication unit, and the communication unit executes, via the control unit, at least one of the following: acquisition of data on the thread shapes of the male joint and the female joint; and output of information regarding the clearance obtained by the clearance measurement process.
  • a threaded joint measurement system includes a measurement unit configured to be able to measure the thread shape of a male joint and the thread shape of a female joint corresponding to the male joint for a set of threaded joints, and a clearance measurement device according to the above invention that measures the clearance for each set of threaded joints based on data on the thread shape measured by the measurement unit.
  • a measurement terminal is configured to be capable of measuring the clearance between the threads of a male joint and a female joint corresponding to the male joint for a set of threaded joints, and is controlled by a control unit, and includes a measurement unit that measures the thread shape of the male joint and the thread shape of the female joint under the control of the control unit, a communication unit that executes at least one of an output process that outputs the measured thread shape as data to the clearance measurement device according to the above invention under the control of the control unit, and an acquisition process that acquires information regarding the clearance from the clearance measurement device for each set of joints, and an output unit that is capable of outputting the acquired information in a predetermined format under the control of the control unit.
  • control unit executes at least one of the following processes: a process for determining pass/fail for the set of threaded joints based on the acquired information on the clearance and a predetermined criterion; and an interference information assignment process for assigning information on an interference point to a point determined to be an interference point based on the acquired information on the clearance and a predetermined criterion.
  • a measurement system for threaded joints according to the present invention includes a measurement terminal according to the above invention and a clearance measurement device according to the above invention that measures the clearance for each pair of threaded joints based on data on the thread shape measured by the measurement terminal.
  • a quality control method for a threaded joint is a quality control method for a threaded joint that controls the quality of a threaded joint set having a male joint and a female joint corresponding to the male joint, and controls the quality of the threaded joint set using information regarding the clearance obtained from a clearance measurement process executed by a control unit of the clearance measurement device according to the above invention.
  • the clearance measurement method, clearance measurement device, threaded joint measurement method, threaded joint measurement system, measurement terminal, threaded joint manufacturing method, and threaded joint quality control method of the present invention make it possible to more easily check the connection of a threaded joint regardless of the condition of the threaded joint or the connected pipe.
  • FIG. 1 is a diagram showing the start state of joining of a threaded joint that is to be measured in a threaded joint measurement system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a completed joining state of a threaded joint that is to be measured in the threaded joint measurement system according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing a threaded joint measurement system according to a first example of an embodiment of the present invention.
  • FIG. 4 is a block diagram showing a threaded joint measurement system according to a second embodiment of the present invention.
  • FIG. 5 is a flowchart for explaining the measurement method for a threaded joint according to the first embodiment of the present invention.
  • FIG. 1 is a diagram showing the start state of joining of a threaded joint that is to be measured in a threaded joint measurement system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a completed joining state of a threaded joint that is to be
  • FIG. 6 is a flowchart for explaining the clearance measurement process according to the first embodiment of the present invention.
  • FIG. 7A is a diagram for explaining coordinates of a threaded joint in a clearance measurement method according to an embodiment of the present invention.
  • FIG. 7B is a diagram for explaining coordinates of a threaded joint in the clearance measurement method according to an embodiment of the present invention.
  • FIG. 7C is a diagram for explaining coordinates of a threaded joint in the clearance measurement method according to an embodiment of the present invention.
  • FIG. 8 is an enlarged cross-sectional view showing a joining portion of a threaded joint in an embodiment of the present invention.
  • FIG. 9 is an enlarged cross-sectional view showing an interference portion at a joining portion of a threaded joint in an embodiment of the present invention.
  • FIG. 10 is a flowchart for explaining a first modified example of the clearance measuring step in the clearance measuring method according to the first embodiment of the present invention.
  • FIG. 11 is a flowchart for explaining a second modified example of the clearance measuring step in the clearance measuring method according to the first embodiment of the present invention.
  • FIG. 12 is a flowchart for explaining a threaded joint measurement method according to the second embodiment of the present invention.
  • FIG. 13 is a flowchart for explaining a threaded joint measurement method according to the third embodiment of the present invention.
  • Figures 1 and 2 are diagrams showing the joining start state and the joining completion state, respectively, of the threaded joint that is the object of measurement (measurement target) in the clearance measurement system of this embodiment.
  • a threaded joint 10 is configured to have a male joint 11 as an inner joint and a female joint 12 as an outer joint.
  • a male thread 13 is formed on the tip side, which is the side where the male joint 11 is inserted and fitted.
  • a female thread 14 is formed on the tip side, which is the side where the female joint 12 is inserted and fitted.
  • the female thread 14 formed on the female joint 12 is formed in a thread shape corresponding to the male thread 13 formed on the male joint 11.
  • the male joint 11 and the female joint 12 correspond to each other, and are configured so that the male joint 11 can be inserted into the female joint 12 by screwing.
  • the thread shape may be known or unknown.
  • the thread shape may be single-thread or multiple-thread, and in this embodiment, for example, multiple-thread.
  • the thread shape may be a tapered thread or a parallel thread, and in this embodiment, for example, a parallel thread.
  • the material is not particularly limited. Examples include steel, metal materials other than steel, concrete, resin, and a combination of multiple materials.
  • the material of the threaded joint is selected according to the purpose of use and the conditions of the pipes, etc., which will be described later.
  • the present invention is particularly effective in the case of threaded joints that are large in diameter or heavy (long) and therefore difficult to check the joining before shipping from the factory.
  • the pipes 15 and 16 each constitute a structure.
  • the pipe 15 constitutes an upper structure.
  • the pipe 16 constitutes a lower structure.
  • Various structures can be used as the structure, such as those that have a specific function when buried in the ground, those that are used as part of a structure on the ground, and those that transport gas or liquid by utilizing the internal space of the pipes 15 and 16.
  • Examples of those that have a specific function when buried in the ground include piles, retaining piles, landslide prevention piles, pipe sheet piles, sheet pile walls, and tunnels.
  • Examples of those that are used as part of a structure on the ground include columns and beams.
  • Examples of those that transport gas or liquid by utilizing the internal space of the pipes 15 and 16 include oil well pipes, water pipes, and gas pipes.
  • examples of the pipes 15 and 16 include steel pipes, concrete pipes, resin pipes, and pipes made of a combination of multiple materials.
  • the pipes 15 and 16 are particularly effective in the case of steel pipes with threaded joints, in which it is difficult to confirm the joint before shipping from the factory because the pipes are large in diameter, long, or heavy.
  • a male fitting 11 having a male thread 13 is fixed to the upper pipe 15.
  • a female fitting 12 having a female thread 14 is fixed to the lower pipe 16.
  • the male fitting 11 may be fixed to the lower pipe 16 and the female fitting 12 may be fixed to the upper pipe 15, in the opposite manner to the above.
  • the male fitting 11 and female fitting 12 may be used as the measurement subject without connecting the pipes 15 and 16.
  • FIG. 3 is a block diagram showing the threaded joint measurement system according to the first embodiment.
  • the threaded joint measurement system 1 is configured to have a clearance measurement device 20 and a measurement unit 35. Furthermore, the clearance measurement device 20 is connected to a thread processing device 40.
  • the threaded joint measurement system 1 may adopt a configuration having the clearance measurement device 20, the measurement unit 35, and the thread processing device 40.
  • the threaded joint measurement system 1 according to the first embodiment is designed for use with the clearance measurement device 20 fixed in place, but the measurement unit 35 and the clearance measurement device 20 can be located close to each other or at a large distance.
  • Clearance measurement device 20 includes a control unit 21, a storage unit 22, and an input/output unit 23. It is possible not to provide input/output unit 23. Clearance measurement device 20 can use a known computer, server, notebook computer, mobile terminal, tablet, smartphone, or a virtual device on a network such as the cloud.
  • the control unit 31 as a control means specifically includes a processor having hardware such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), and a main memory unit such as a RAM (Random Access Memory) or a ROM (Read Only Memory) (none of which are shown).
  • a processor having hardware such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), and a main memory unit such as a RAM (Random Access Memory) or a ROM (Read Only Memory) (none of which are shown).
  • the storage unit 22 is physically composed of a storage medium selected from a volatile memory such as a RAM, a non-volatile memory such as a ROM, an erasable programmable ROM (EPROM), a hard disk drive (HDD), a solid state drive (SSD), and a removable medium.
  • the removable medium is, for example, a universal serial bus (USB) memory, or a disk recording medium such as a compact disc (CD), a digital versatile disc (DVD), or a Blu-ray (registered trademark) disc (BD).
  • the storage unit 22 may also be configured using a computer-readable recording medium such as an externally mountable memory card.
  • the storage unit 22 can store an operating system (OS), various programs, various tables, various databases, and the like for executing the operation of the clearance measurement device 20.
  • the various programs include learning models and neural networks. These various programs can also be recorded on computer-readable recording media such as hard disks, flash memory, CD-ROMs, DVD-ROMs, and flexible disks, and widely distributed.
  • the storage unit 22 stores a clearance database 221 and a pipe type database 222.
  • various information pipe type information regarding the male joint 11 and the female joint 12 that constitute the threaded joint 10 is stored in a searchable manner as basic information.
  • the pipe type information includes the identification ID of the threaded joint 10, the dimensions (diameter, thread dimension, thread pitch, thread height, length, etc.) and specifications of the male joint 11 and the female joint 12.
  • the clearance database 221 stores searchable information regarding the clearance between the male thread 13 and the female thread 14 based on the pipe type information, and information on the measurement results regarding the clearance between the male thread 13 and the female thread 14 measured by the measurement unit 35 described later (hereinafter, clearance information).
  • the clearance information includes various information related to the clearance, such as flag information as information on the interference location that specifies the interference location, and pass/fail (pass/fail) information for the set of threaded joints 10.
  • the clearance calculation unit 211 of the control unit 21 is configured to be able to store the thread shapes of the male thread 13 and the female thread 14 measured by the measurement unit 35 as digital data in the clearance database 221 of the memory unit 22.
  • the memory unit 22 may be provided in a housing different from that of the control unit 21, and may use an external storage device or a virtual storage device such as a cloud on a network.
  • control unit 21 loads a program stored in the memory unit 22 into the working area of the main memory unit, executes it, and controls each component through the execution of the program, thereby realizing a function that meets a predetermined purpose.
  • control unit 21 can realize the functions of the clearance calculation unit 211 and the determination unit 212 by executing the program.
  • the input/output unit 23 is composed of, for example, a touch panel display, a speaker microphone, buttons, switches, a jog dial, etc. As an output unit, the input/output unit 23 is configured to notify the outside of specified information by displaying characters, figures, etc. on the screen of a display such as a liquid crystal display, an organic EL display, or a plasma display, or by outputting sound from a speaker, under the control of the control unit 21.
  • the input/output unit 23 includes a printer that outputs specified information by printing it on printing paper, etc.
  • the various information stored in the memory unit 22 can be viewed on a display of the input/output unit 23 installed in, for example, a specified office, etc.
  • the input/output unit 23 as an input unit is configured to be selected from, for example, a keyboard, a touch panel keyboard incorporated inside the input/output unit 23 to detect touch operations on a display panel, a voice input device that enables calls to and from the outside, a switch, or a jog dial.
  • the input/output unit 23 can input the clearance measurement value from the input/output unit 23.
  • the measurement unit 35 is composed of at least one device, such as a handheld 3D scanner.
  • a handheld 3D scanner for example, a laser irradiation device or an infrared irradiation device can be adopted. Since the handheld 3D scanner needs to be operated while maintaining a focal length (for example, 20 cm to 40 cm) according to the model, it is desirable to secure a space of 50 cm or more around the scanning target.
  • the measurement accuracy is set in various ways depending on the size of the screw joint 10 and the thread shapes of the male thread 13 and the female thread 14, and is not limited to these numerical values.
  • a handy measuring device such as a handy 3D scanner, is desirable from the viewpoint of operability.
  • the sensor constituting the measuring unit 35 can measure the distance from an installation position to an object, for example, the thread surface of the male thread 13 or female thread 14, by irradiating and reflecting a specific light, such as laser light.
  • the measuring unit 35 can perform so-called sensing, which measures the distance from the measurement position to the surface of the object in association with two-dimensional position information. Sensing includes various measurements performed by the measuring unit 35.
  • the two-dimensional position information coordinates (x, y) on the xy plane, coordinates (r, ⁇ ) at distance r and rotation angle ⁇ , etc. can be used. Based on the distance information corresponding to the two-dimensional position information, it becomes possible to measure the thread shape on the surface of the male thread 13 or female thread 14 in three dimensions.
  • the resolution should be sufficient to accurately reproduce the shape of the thread that affects the clearance used to determine whether the male joint 11 and the female joint 12 can be joined.
  • the resolution should be approximately 1 mm or less, but is not limited to this value.
  • the male and female joints 11 and 12 are combined on the scanned data to determine whether they can be joined, in the case of an object whose direction is not fixed, it is desirable to ensure directionality by providing a marker or a mark with a shape that can be recognized by scanning.
  • the measurement unit 35 executes an output process to output the measurement values of the thread shape measured by sensing to the clearance measurement device 20.
  • the clearance calculation unit 211 in the control unit 21 of the clearance measurement device 20 stores the acquired measurement values in the clearance database 221 of the storage unit 22.
  • the thread machining device 40 is a device for an adjustment process for the male threads 13 and the female threads 14 of the threaded joint 10.
  • the thread machining device 40 includes a control unit 41, a memory unit 42, an input/output unit 43, and a thread machining unit 45.
  • the control unit 41, the memory unit 42, and the input/output unit 43 are functionally and physically configured in the same manner as the control unit 21, the memory unit 22, and the input/output unit 23, respectively.
  • the thread machining device 40 is connected to the clearance measurement device 20.
  • the control unit 41 loads a program stored in the memory unit 42 into the working area of the main memory unit, executes it, and controls each component unit through the execution of the program, thereby realizing a function that meets a predetermined purpose.
  • the control unit 41 can realize the function of the machining control unit 411 by executing the program.
  • the machining control unit 411 is configured to be able to control the thread machining unit 45.
  • the clearance calculation unit 211 of the clearance measurement device 20 reads out the clearance information from the clearance database 221 stored in the memory unit 22 and outputs it to the thread processing device 40.
  • the thread processing device 40 which has acquired the clearance information, stores the acquired clearance information at least temporarily in the memory unit 42.
  • the processing control unit 411 of the control unit 41 controls the thread processing unit 45 to execute a processing process to correct the interference part based on the acquired clearance information.
  • the thread processing device 40 may be configured integrally with the clearance measurement device 20. Furthermore, the thread processing device 40 can also manufacture the threaded joint 10. The above constitutes the threaded joint measurement system 1 according to the first example of the embodiment.
  • Fig. 4 is a block diagram showing the threaded joint measurement system according to the second embodiment.
  • the threaded joint measurement system 1A is configured to include a clearance measurement device 20 and a measurement terminal 30A that are capable of communicating with each other via a network 2.
  • Network 2 is, for example, a public communications network such as the Internet, and is composed of one or more combinations of, for example, a LAN (Local Area Network), a WAN (Wide Area Network), a telephone communications network such as a mobile phone, a public line, a VPN (Virtual Private Network), and a dedicated line.
  • Network 2 is an appropriate combination of wired communications and wireless communications.
  • the threaded joint measurement system 1A may further be connected to a thread processing device 40 that can communicate with at least the clearance measurement device 20 via the network 2.
  • the threaded joint measurement system 1A may also adopt a configuration that includes the clearance measurement device 20, the measurement terminal 30A, and the thread processing device 40.
  • the clearance measurement device 20A includes a control unit 21, a storage unit 22, an input/output unit 23, and a communication unit 24.
  • the communication unit 24 serving as a communication means is, for example, a LAN (Local Area Network) interface board or a wireless communication circuit for wireless communication.
  • the LAN interface board and the wireless communication circuit are connected to a network 2.
  • the communication unit 24 is connected to the network 2 and communicates with the measurement terminal 30A and the thread machining device 40A.
  • the other configurations are similar to those of the clearance measurement device 20 in the first embodiment.
  • the measurement terminal 30A includes a control unit 31, a storage unit 32, an input/output unit 33, a communication unit 34, and a measurement unit 35.
  • the control unit 31, the storage unit 32, the input/output unit 33, and the communication unit 34 have the same physical and functional configurations as the control unit 21, the storage unit 22, the input/output unit 23, and the communication unit 24 described above, respectively.
  • the measurement unit 35 in the measurement terminal 30A according to the second embodiment is configured similarly to the measurement unit 35 in the first embodiment.
  • the control unit 31 can realize functions that meet a predetermined purpose by loading a program stored in the memory unit 32 into the working area of the main memory unit and executing the program. Specifically, the control unit 31 can realize the functions of the measurement control unit 311 by executing the program.
  • the measurement control unit 311 is configured to be able to control the measurement unit 35.
  • the thread machining device 40A includes a control unit 41, a memory unit 42, an input/output unit 43, a communication unit 44, and a thread machining unit 45.
  • the communication unit 44 which serves as communication means, is physically and functionally configured in the same manner as the communication unit 24 described above, and is connected to the network 2.
  • the communication unit 44 is connected to the network 2 and communicates with at least the clearance measurement device 20A.
  • the other configurations are the same as those of the thread machining device 40 in the first embodiment.
  • Fig. 5 is a flowchart showing the method for measuring a threaded joint 10 according to the first embodiment.
  • step ST1 a joint manufacturing process is performed by a thread processing device 40.
  • step ST1 a forged ring is manufactured by heat treatment.
  • step ST2 while rotating a cast ring by rotary cutting, a cutting blade is brought into contact with the cast ring and cut to process it into a joint.
  • the movement of the cutting blade can be automatically controlled by the control of the processing control unit 411 according to a predetermined program.
  • the thread shape of the joint is a multiple thread, one part, that is, the same place is cut little by little until one thread is completed. When one thread is completed, the cutting blade is moved to the next thread.
  • step ST2 the pipe connection process is performed.
  • step ST2 first, the joining of the threaded joint performed in step ST1 is released.
  • one of the male joint 11 and the female joint 12, here for example the female joint 12 is attached to a horizontally placed steel pipe.
  • the male joint 11 alone is trial joined to the horizontally placed steel pipe with the female joint. After confirming whether or not the arrival line is reached by this trial joining, the joining is released.
  • the other of the male joint 11 and the female joint 12, here for example the male joint 11, is attached to the horizontally placed steel pipe.
  • this trial joint is used to confirm whether the joint can be completed to the joining position while allowing for the effects of thermal deformation caused by welding.
  • the steel connecting joint that connects the steel pipes horizontally is welded, and then the threaded joint is welded to the steel pipe. Note that it is also possible not to perform this step ST2.
  • the method includes a shape measurement step of measuring the shape of the threaded joint after processing, and a clearance measurement step for a set of threaded joints based on the measured shape of the threaded joint. These shape measurement step and clearance measurement step are performed before the threaded joint 10 is actually used.
  • step ST3 shape measurement process
  • the process proceeds to step ST3 to perform a shape measurement process.
  • the shape measurement process first, the thread shapes of the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12 are measured by the measurement unit 35 for one set of threaded joint 10 manufactured in step ST1.
  • the measurement unit 35 outputs or transmits (hereinafter referred to as transmission) measurement data of the measured thread shapes to the clearance measurement device 20.
  • the measurement of the thread shape using the measurement unit 35 is performed by, for example, measuring the distance from the measurement unit 35 to the surfaces of the threaded joints (male joint 11, female joint 12).
  • the thread shape can be measured by photographing the threaded joint (male joint 11, female joint 12) from multiple viewpoints to obtain multiple image data, and then using the multiple images obtained to perform photogrammetry.
  • the obtained point cloud data is converted into polygons (STL conversion, mesh conversion), and shape measurement and virtual placement are performed using CAD software that performs three-dimensional measurement of the threaded joint 10, which is the target object.
  • the apex of the screw is included in the data points of the point cloud data, and more specifically, it is preferable that the apex of the screw is equal to or smaller than the radius of curvature of the apex of the screw, for example, a resolution of about 0.5 mm or less.
  • the resolution may be about 1 mm.
  • the accuracy of the data points can be set to less than half the clearance, specifically, for example, if the clearance is 0.75 mm, the accuracy of the data points can be set to less than 0.375 mm, allowing for a judgment with sufficient accuracy for practical use.
  • the male joint 11 and female joint 12 are considered to be rigid bodies and the joining judgment is performed, so there is no problem with the pass judgment when there is clearance.
  • the judgment standard value does not necessarily have to be based on 0; for example, it is possible to judge whether or not the fit can be performed using a digital clearance of -0.2 mm (virtual interference amount of 0.2 mm) as the standard. Also, depending on the measurement accuracy, interference may occur even when the clearance is a positive value, so it is desirable to set an appropriate judgment standard. Note that positive and negative clearances depend on the method of sorting, so a negative value may be used to indicate that a clearance exists.
  • the measurement unit 35 measures the outer surface side of the male joint 11 and the inner surface side of the female joint 12. In this case, it is possible to shorten the measurement time and reduce the amount of measurement data. Furthermore, when converting the acquired point cloud data into polygons (STL conversion, mesh conversion), points within a specified surface error range (for example, 0.01 mm) can be omitted to reduce the data volume.
  • Fig. 6 is a flowchart showing the clearance measurement method according to the first embodiment. The flowchart shown in Fig. 6 is executed by clearance measurement device 20.
  • step ST411 as an acquisition step for performing acquisition processing
  • control unit 21 of clearance measurement device 20 acquires measurement data from measurement unit 35.
  • the measurement data is measurement data relating to the thread shape of male thread 13 of male joint 11 and the thread shape of female thread 14 of female joint 12 measured by measurement unit 35 in step ST3.
  • step ST412 is a joining completion state setting step in which a joining completion state setting process is executed, and the clearance calculation unit 211 of the control unit 21 sets a joining completion state in which the male joint 11 is joined to the inside of the female joint 12 based on the acquired measurement data of the thread shapes of the male thread 13 and the female thread 14.
  • the "joining completed state” refers to a state in which the entire length of the threaded portion of the male fitting 11 in the axial direction of the pipe is almost entirely housed inside the female fitting 12, and joining is complete, as shown in Figure 2. In other words, it is a state in which the male fitting 11 is screwed into the female fitting 12 and can no longer rotate in the direction in which the thread advances. As shown in Figure 2, ideally, the unthreaded portion of the male fitting 11 comes into contact with the tip of the female fitting 12 (this is called shoulder touch).
  • This joining completion state is set as the initial position, and the clearance measurement starts from the joining completion state.
  • the position where the male and female threads join (which is also the start position of the threads in the circumferential direction of the joint) is identified while moving.
  • the position where the male and female threads join (which is also the start position of the threads in the circumferential direction of the joint) is identified while moving.
  • identifying this position can be very difficult.
  • identifying this position is also difficult if it is intended to be used at a specific start position.
  • the joining completion position where the male and female threads have been joined can be easily set in any environment, including virtual ones. Therefore, in the present invention, the joining completion position is set as the initial position, and the clearance is measured while the joining is released, simplifying the clearance measurement process and making it easier to measure the clearance regardless of the state of the threaded joint or the connected pipe.
  • step ST413 a clearance measurement step
  • the clearance calculation unit 211 of the control unit 21 derives the clearance between the male thread 13 and the female thread 14 based on the measurement data of the male thread 13 and the female thread 14 in the joining completed state.
  • the clearance calculation unit 211 derives the clearance at a preset location.
  • the clearance is also referred to as a gap or play.
  • Figures 7A, 7B, and 7C show how to create a coordinate system for the measurement position. That is, as shown in Figure 7A, a plane is created to create a cross section of the male thread 13 of the male joint 11 and a cross section along the radial direction of the female thread 14 of the female joint 12, and a section line L shown in Figure 7B is created. Next, two straight lines 1 are created from the section line, and an intersection point C is created. Next, as shown in Figure 7C, a circle (hereinafter referred to as a fit circle) that minimizes the error with the point (specified point) where the curve is specified is created. A coordinate system is created using the center point of this fit circle and multiple intersection points C. Note that the method of creating a coordinate system explained using Figures 7A to 7C is merely one example, and the creation and setting of a coordinate system can be performed by any method.
  • pre-set locations for example, shifted by 90° on a circumference with respect to the center of the circle in the cross section (plane perpendicular to the up-down direction in FIG. 1 and FIG. 2) of the male joint 11 or female joint 12.
  • locations and number of locations are not necessarily limited to a predetermined number.
  • the clearance calculation unit 211 In step ST413, the clearance calculation unit 211 generates a cross-sectional view of the thread from the data on the thread shape at four or eight positions that have been set in advance, as described above, and derives the clearance c between the male thread 13 and the female thread 14. In this way, by setting the method for determining the measurement points as shown in Figures 7A to 7C, the clearance calculation unit 211 can automatically calculate the specified locations using a predetermined method. Note that the cross-sectional view of the thread generated by the clearance calculation unit 211 may be output to the input/output unit 23 of the clearance measurement device 20, and an operator may visually determine whether or not there is a clearance and input the presence or absence of a clearance from the input/output unit 23.
  • FIGS. 8 and 9 show an example of a cross section of the digitized threaded joint 10 generated by the clearance calculation unit 211 of the clearance measurement device 20 according to the first embodiment.
  • FIG. 8 is a cross section showing an enlarged portion of the digitized threaded joint 10 in a state in which the male thread 13 and female thread 14 are joined without interfering with each other.
  • FIG. 9 is a cross section showing an enlarged portion of the digitized threaded joint 10 in a state in which the male thread 13 and female thread 14 are partially interfering with each other and are not joined properly.
  • the male joint 11 and the female joint 12 are joined.
  • the height h of the threads 13a of the male thread 13 that is properly joined is, for example, 5.0 mm.
  • the center of the threads 13a, 14a is the closest point that is half the distance between the corners of the male thread 13.
  • the white points p are measurement points that ensure sufficient resolution for the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12. The more white points p there are, the more accurate the determination of the center positions of the male thread 13 and the female thread 14 can be.
  • the height h of the threads 13a, 14a is the distance between the center of the threads 13a, 14a and the bottom of the stabbing side.
  • the radial clearance c between the threads 13a of the male thread 13 and the thread bottom 14b of the female thread 14 is, for example, 0.75 mm.
  • the clearance c is the radial component of the line connecting the center of the threads 13a and the center of the thread bottom 14b of the male joint 11.
  • Clearance c is not necessarily limited to the above definition, and various definitions can be set according to whether or not the threaded joint 10 can be joined.
  • the distance may be measured in the normal direction for each point on the male joint 11, or for the line connecting the points, i.e., for each mesh, and the distance when it comes into contact with the female joint 12 in the joined state, i.e., the shortest distance, may be set as clearance c. Conversely, the distance may be measured in the direction from the female joint 12 toward the male joint 11.
  • interference interference part E
  • the male joint 11 and the female joint 12 will not be joined.
  • the height h of the threads 13a of the male thread 13 in an improperly joined state is, for example, 5.0 mm.
  • the radial clearance c between the thread root 14b of the female thread 14 is, for example, -1 mm, meaning that there is interference of 1 mm in the radial direction.
  • the thread pitch P is, for example, 12.5 mm, but is not limited thereto.
  • the thread pitch P is the axial distance from the end of the thread root 13b of a male thread 13 in a certain thread to the beginning of the thread root 13b of the next male thread 13 in a certain thread.
  • the thread pitch P is the axial distance from the end of the thread 14a of a certain female thread 14 in a certain thread to the beginning of the thread 14a of the next single thread.
  • the thread pitch P means the distance the thread advances when it rotates once.
  • the thread pitch P differs in the distance the thread advances when it rotates once depending on the number of threads of the thread, so it is difficult to define the thread pitch P as a constant distance. Therefore, although the thread pitch P is defined as above in this specification, it is not necessarily limited to the above definition.
  • the clearance calculation unit 211 stores the clearance c results derived at multiple locations, for example, four or eight locations, as clearance information in the clearance database 221.
  • the clearance c is derived for all threads 13a, 14a and thread roots 13b, 14b of the joined portions at multiple locations, which are preset, in the male joint 11 and the female joint 12.
  • the minimum clearance c along the radial direction with respect to the rotation axis is then derived.
  • the clearance calculation unit 211 uses a predetermined measurement software to extract the value at which the clearance c between the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12 is minimum in the rotation radial direction in each longitudinal section (see FIG. 7B).
  • the derived clearance c information may be stored in the storage unit 22 in association with the thread joint identification ID of the pipe type information stored in the pipe type database 222.
  • step ST414 a clearance determination step, where the determination unit 212 of the control unit 21 reads out clearance information from the clearance database 221 of the storage unit 22 and determines whether or not joining is possible according to a predetermined criterion. That is, the determination unit 212 makes a determination based on, for example, the predetermined criterion, that is, whether or not the clearance c between the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12 is equal to or smaller than a predetermined value.
  • the predetermined value can be set to any value, and in this embodiment, the predetermined value is set to 0, for example.
  • step ST414 determines in step ST414 that the clearance c between the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12 is equal to or less than a predetermined value, specifically, for example, equal to or less than 0 (c ⁇ 0) (step ST414: Yes)
  • the process proceeds to step ST418.
  • step ST4108 the determination unit 212 outputs information that the threaded joint 10 being measured has failed, and stores this failure information in the clearance database 221 as clearance information. This completes the clearance measurement process.
  • step ST414 judges in step ST414 that the clearance c between the male thread 13 of the male fitting 11 and the female thread 14 of the female fitting 12 is greater than a predetermined value, specifically, for example, greater than 0 (c>0) (step ST414: No), it proceeds to step ST415.
  • a predetermined value specifically, for example, greater than 0 (c>0)
  • interference E may occur not only in the radial direction of the threaded portion, but also in the axial direction of the threaded portion and in other locations besides the threaded portion, so it may be judged in the same way.
  • the judgment unit 212 can judge that joining is possible if the radial clearance of the threaded portion satisfies the above-mentioned condition (c > predetermined value).
  • step ST415 as a joining determination step, the determination unit 212 determines whether or not the male joint 11 and the female joint 12 are not screwed together and the joining is disengaged in the threaded joint 10. If the determination unit 212 determines that the male joint 11 and the female joint 12 are not screwed together and the joining is disengaged (step ST415: Yes), the process proceeds to step ST417.
  • step ST417 the determination unit 212 outputs information that the threaded joint 10 being measured has passed, and stores this pass information in the clearance database 221 as clearance information.
  • the clearance calculation unit 211 can derive the clearance c for the entire circumference of the male thread 13 and female thread 14 up to the state where the male joint 11 and female joint 12 are virtually disconnected. This completes the clearance measurement process.
  • step ST415 determines in step ST415 that the male joint 11 and the female joint 12 are not separated and the connection is not disconnected (step ST415: No), the process proceeds to step ST416.
  • step ST416 as a rotational state setting step for performing a rotational state setting process, the clearance calculation unit 211 sets a state in which the joined male joint 11 and female joint 12 are rotated in the disengagement direction by a predetermined rotation angle, specifically, for example, 90° or 45°.
  • a predetermined rotation angle specifically, for example, 90° or 45°.
  • the initial positions of the male joint 11 and the female joint 12 are determined to be one position, so the search for the rotation start position can be omitted.
  • the joining confirmation is performed on the actual threaded joint 10 rather than on a digitalized one, it is possible to identify the initial position for starting the joining while moving it.
  • Specific steps executed by the clearance calculation unit 211 in step ST416 are as follows: first, the digitized male joint 11 and female joint 12 are virtually placed at the joining completion position as shown in FIG. 2.
  • the rotation axes of the male joint 11 and female joint 12 are extracted. Specifically, for example, multiple points are selected, for example, four or eight points, for the outer diameter of the tip of the male joint 11 and the inner diameter of the tip of the female joint 12.
  • a fitting circle that minimizes the deviation from the selected points is created, and the center of the fitting circle is set as the rotation axis.
  • the rotation axes of the male joint 11 and female joint 12 are aligned to derive a state of shoulder touch.
  • the position of the eye mark is set as the joining completion position. Note that any method can be used to set the rotation axis and the joining completion position, and various methods other than the above-mentioned method can be used.
  • the minimum clearance along the radial direction of the rotation axis is derived for all threads 13a, 14a in vertical sections (see Figures 7A to 7C) at an angle interval of less than a predetermined angle, such as 45° or 90°.
  • a predetermined angle such as 45° or 90°.
  • the part where the clearance is negative is also measured.
  • the value at which the clearance of the threaded part of the male joint 11 and the female joint 12 in the rotation radius direction is minimum in each vertical section is extracted using measurement software. More specifically, the overall minimum value is derived, or the minimum value is derived for each of the multiple threads of the threads 13a, 14a.
  • the distance may be measured in the normal direction of the line connecting each point on the male joint 11, i.e., for each mesh, and the distance when it comes into contact with the female joint 12 in the joined state, i.e., the shortest distance, may be set as the clearance c. Conversely, the distance may be measured in the direction from the female joint 12 to the male joint 11.
  • the joint is rotated in the opposite direction to the joining direction by a preset rotation angle.
  • the rotation angle can be, for example, 45° or 90° intervals, but is not limited to this.
  • the amount of axial movement corresponding to the angle of reverse rotation is determined by the thread pitch P of the male thread 13 and female thread 14.
  • the cross section from which the clearance is derived and the intervals of reverse rotation are set to 45° or less or 90° or less because the threaded joint 10 is continuous in the circumferential direction, making it difficult for local deformation to occur, and the presence or absence of interference can be sufficiently detected even when checking at intervals of about 45° to 90°.
  • the rotating shaft of the male joint 11 is moved to the side with the larger clearance along the direction of the rotation radius, and the presence or absence of interference is confirmed at that stage. If further interference occurs, the rotating shafts of the male joint 11 and female joint 12 are moved along the axial direction to search for a position where no interference occurs. When a position where no interference occurs is identified, reverse rotation is started again from that position. Note that the presence or absence of interference may also be determined without moving the rotating shaft.
  • step ST416 After the rotation state setting step in step ST416 is completed, the process proceeds to step ST413, where the clearance c of the joint at the preset location is derived.
  • the control unit 21 repeats steps ST413 to ST416 until the clearance c becomes equal to or less than a predetermined value (step ST414: Yes) or the joint between the male joint 11 and the female joint 12 is released (step ST415: Yes).
  • the determination unit 212 then stores pass or fail information on the threaded joint 10 being measured as clearance information in the clearance database 221. This completes the clearance measurement process.
  • the time required to determine whether the threaded joint 10 is a failed product can be shortened by determining that the threaded joint 10 is a failed product when the clearance c becomes equal to or less than a predetermined value.
  • step ST5 shown in FIG. 5, where the control unit 21 outputs information on whether the threaded joint 10 being measured is pass or fail to the input/output unit 23.
  • a mark may be put on the actual threaded joint 10.
  • threaded joints 10 that are judged to be failing it is possible to appropriately select whether to carry out the adjustment process described below or to discard the threaded joint. With the above, the measurement process for the threaded joint is completed.
  • the quality of the threaded joint 10 can be controlled based on the above-described method for measuring a threaded joint. That is, in the quality control method for the threaded joint 10, first, the threaded joint 10 is manufactured in a joint manufacturing process in step ST1. Next, the thread shapes of the male threads 13 and female threads 14 of the threaded joint 10 are measured in a joint measurement process in step ST3. After that, in step ST4, the measurement results obtained in the joint measurement process are used to measure the clearance for each pair of the male threads 13 and female threads 14, thereby making it possible to control the quality of the threaded joint 10 as a quality control process.
  • Fig. 10 is a flow chart for explaining the clearance measurement process according to the first modified example.
  • the clearance measurement process is completed at the stage where a portion where the clearance is equal to or less than a predetermined value is found.
  • the clearance measurement process according to the first modified example is different from the clearance measurement process according to the first embodiment in that it is assumed that the entire circumference of the male joint 11 and the female joint 12 of the threaded joint 10 is measured regardless of whether the clearance measurement is pass or fail.
  • steps ST421 to ST423 are respectively similar to steps ST411 to ST413 in the first embodiment described above.
  • the process proceeds to step ST424.
  • the clearance calculation unit 211 stores the result of the clearance c derived at multiple locations set in advance, for example, four or eight locations, in the clearance database 221 as clearance information.
  • the process proceeds to step ST425.
  • Steps ST425 and ST426 are respectively similar to steps ST415 and ST416 in the first embodiment.
  • the process of determining whether the clearance is equal to or less than a predetermined value is not executed. The other processes are similar to those in the first embodiment, and therefore will not be described.
  • Fig. 11 is a flow chart for explaining the clearance measurement process according to the second modified example.
  • the clearance measurement process is completed at the stage where a portion where the clearance is equal to or less than a predetermined value is found.
  • the clearance measurement process according to the second modified example is different from the clearance measurement process according to the first embodiment in that the clearance is measured over the entire circumference of the male joint 11 and the female joint 12 of the threaded joint 10, regardless of whether the clearance is equal to or less than the predetermined value, and then a judgment is made based on a comparison with the predetermined value.
  • steps ST431 to ST434 are respectively similar to steps ST421 to ST424 in the first modified example described above.
  • the process proceeds to step ST435 after step ST434 is executed.
  • step ST435 the clearance calculation unit 211 executes step ST435, which is a rotation state setting step similar to step ST416 in the first embodiment.
  • the process proceeds to step ST436.
  • step ST436 the determination unit 212 determines whether the connection has come apart in the same manner as in step ST415. If the determination unit 212 determines in step ST436 that the connection of the threaded joint 10 has not come apart (step ST436: No), the process proceeds to step ST433, and steps ST433 to ST436 are repeatedly executed. If the determination unit 212 determines in step ST436 that the connection of the threaded joint 10 has come apart (step ST436: Yes), the process proceeds to step ST437.
  • step ST437 the determination unit 212 determines whether the clearance c between the male joint 11 and the female joint 12 is equal to or less than a predetermined value, in the same manner as in step ST414 in the first embodiment. If the determination unit 212 determines in step ST437 that there is no part where the clearance c between the male joint 11 and the female joint 12 is equal to or less than the predetermined value (step ST437: No), the clearance measurement process is terminated. If the determination unit 212 determines in step ST437 that the clearance c between the male joint 11 and the female joint 12 is equal to or less than a predetermined value (step ST437: Yes), the process proceeds to step ST438, which is an interference information assignment step.
  • step ST438 which is an interference information assignment step in which an interference information assignment process is performed
  • the determination unit 212 sets a flag as an interference location at a location where the clearance c is equal to or less than the predetermined value.
  • the determination unit 212 stores the flag related to the interference location as clearance information in the clearance database 221 of the storage unit 22. This completes the clearance measurement process.
  • the clearance measurement process according to the first and second modified examples can be used when it is desired to set the clearance at the manufacturing site or when there is little need to obtain the clearance determination results in real time or in a short time.
  • the clearance measurement process according to the second modified example makes it possible to provide a third party with clearance information such as positions where the clearance is below a predetermined value or the absence of any parts where the clearance is below a predetermined value. This makes it easier to handle cases where the clearance measurement process is performed at a location other than the manufacturing site.
  • the threaded joint 10 measurement method can check whether or not the threaded joint 10 can be joined after the manufacture of the threaded joint 10 is completed or before the operation.
  • the male joint 11 and the female joint 12 were judged based on whether they could rotate, but the interference between the threads 13a and 14a can be confirmed as the clearance between the threads based on information from the measurement results, ensuring accuracy.
  • the measurement starts from the joining completion position of the threaded joint 10, there is no need to search for the joining start position, and it is also possible to find the interference point early, so that the measurement of the clearance of the threaded joint 10 can be started efficiently.
  • the place where the threaded joint 10 measurement method according to this embodiment can be used is not limited to a factory, but can also be used in a storage area at the construction site. Specifically, for example, if there is concern that the threaded joint 10 may be deformed due to damage caused by welding additional components, transportation, or excessive exposure to direct sunlight at the construction site, the shape of the male joint 11 and female joint 12 can be measured by the measuring unit 35 at the construction site and a joint determination can be made before the actual joining, minimizing the stoppage of on-site work due to problems.
  • Fig. 12 is a flow chart for describing a method for measuring a threaded joint 10 according to the second embodiment.
  • the clearance c is determined over the entire circumference of the threads 13a, 14a in the male joint 11 and the female joint 12, and then a pass/fail determination is performed for each threaded joint 10.
  • step ST414 as a clearance determination step is separated from the clearance measurement step (step ST4) as a pass/fail determination step.
  • steps ST1 to ST4 are executed as in the first embodiment. Then, instead of step ST5 according to the first embodiment, a pass/fail determination process is executed in step ST6. Also, in the second embodiment, it is preferable to adopt the clearance measurement process according to the first or second modified example as the clearance measurement process in step ST4.
  • the judgment unit 212 judges whether the joining of the threaded joint 10 is pass/fail based on the clearance information of the entire circumference of the male thread 13 and the female thread 14 derived by the clearance calculation unit 211 in step ST4, for example, by executing steps ST423 and ST433. That is, the judgment unit 212 reads and acquires the clearance information from the clearance database 221 in the storage unit 22, and judges whether the joining of the threaded joint 10 is pass/fail based on the acquired clearance information. Various criteria can be adopted as the criteria for the pass/fail judgment by the judgment unit 212. A method similar to that of step ST414 (see FIG. 6) as the clearance judgment step described above can be used.
  • the clearance c is equal to or less than a predetermined value.
  • the predetermined value is, for example, 0.
  • the parts that are equal to or less than the predetermined value i.e., the parts that are equal to or less than 0
  • a judgment can be adopted in which if there is even one location with a clearance below 0 or a location flagged as an interference location, it is a failure, and if there are no such locations, it is a pass.
  • any location where the clearance c is equal to or less than a preset value may be flagged as an interference location.
  • step ST6 If the threaded joint 10 is judged to be passed in the pass/fail judgment process (step ST6: Yes), the process proceeds to step ST61, where the fact that the threaded joint 10 is passed can be output to the input/output unit 23, etc., or transmitted to the outside via the communication unit 24 and the network 2. Accordingly, the threaded joint 10 judged to be passed can be shipped. On the other hand, the threaded joint 10 judged to be unsuccessful can be discarded or readjusted. In this case, if necessary, the clearance information of the target threaded joint 10 can be associated with the identification ID of the threaded joint and transmitted to the thread processing device 40, 40A.
  • the same effect as in the first embodiment can be obtained. Furthermore, according to the second embodiment, it is possible to use the clearance information to perform pass/fail judgments by an external processing device via the network 2, and to share information on the inspection results of the threaded joint 10.
  • Fig. 13 is a flowchart for explaining a method for measuring a threaded joint 10 according to the third embodiment.
  • the method for measuring a threaded joint 10 according to the third embodiment differs from the first embodiment in that an adjustment step is carried out after a clearance measurement step is carried out in step ST4.
  • steps ST1 to ST4 are performed in the same manner as in the first embodiment. Then, instead of step ST5 according to the first embodiment, an adjustment process is performed in step ST7. Also, in the third embodiment, the clearance measurement process in step ST4 can be the clearance measurement process according to the first embodiment, the first modified example, or the second modified example.
  • step ST7 the adjustment process in step ST7 will be described.
  • an adjustment process is performed after the clearance measurement process.
  • the adjustment process includes adjustment steps described below. Note that, if no pass or fail information is output in the clearance measurement process performed in the preceding stage, step ST6 (pass/fail determination process) according to the second embodiment may be performed before each adjustment step described below in step ST7.
  • step ST7 the adjustment process for the threaded joint 10, the shape measurement process, the clearance measurement process, and the adjustment process can be repeatedly performed until a set of threaded joints 10 that require adjustment is determined to be acceptable. Furthermore, within the adjustment process, a pass/fail determination process can be performed before the adjustment step.
  • an appropriate method can be appropriately selected from, for example, four methods depending on the specifications and purpose of the threaded joint 10 and used.
  • the first method in the adjustment step is to virtually change the joining start position when there are multiple joining start positions for the threaded joint 10, for example when it is composed of a multiple thread, and to perform a pass/fail judgment process by the judgment unit 212 to judge whether it is pass or fail.
  • the pass/fail judgment process is passed, the completion and start positions are marked at the positions corresponding to the actual one.
  • the second method in the adjustment step is to virtually cut a part of the threaded joint 10 within a range that satisfies the strength required for the male joint 11 and the female joint 12, and then perform the pass/fail judgment process again on the threaded joint 10 whose thread shape has been modified to make a pass/fail judgment. If the interference is small, it is possible to cut the actual part with a grinder or the like once it has virtually passed, taking into account cutting within a safety factor of, for example, about 1.2.
  • the first and second methods described above do not require another 3D scan operation by the measurement unit 35.
  • the third method in the adjustment step is to correct a part of the actual threaded joint by correcting it with thermal deformation, measure it again with the measuring unit 35, and perform the pass/fail judgment process again to make a pass/fail judgment. Note that correction by thermal deformation is performed by welding heat or burner heating, and, if necessary, compression or tension using a jack.
  • the fourth method in the adjustment process is to manufacture a new threaded joint 10, measure it again using the measuring unit 35, and then perform the pass/fail judgment process again to make a pass/fail judgment.
  • manufacturing a new threaded joint 10 does not only mean manufacturing a new threaded joint, but also includes removing the threaded joint 10 from the pipes 15, 16 and reattaching it in the case of steel pipes with joints. Note that if there are multiple identical threaded joints 10, it is possible to make threaded joints that pass the pass/fail judgment process by changing the combination of the corresponding male and female joints.
  • the same effect as in the first embodiment can be obtained. Furthermore, according to the third embodiment, since it has an adjustment process, it is possible to adjust the threaded joint 10 to an acceptable product through a new adjustment process.
  • a threaded joint measurement system 1A according to the second example of the embodiment is adopted as a threaded joint measurement system, and the clearance measurement process according to the first embodiment is adopted.
  • the clearance measurement device 20A can be configured from a fixed information processing device, or from a server capable of communicating with the measurement terminal 30A via the network 2.
  • the measurement terminal 30A is configured as a terminal having a communication unit 34 and an independent measurement unit 35 capable of communicating with the clearance measurement device 20A via the network 2.
  • the control unit 31 of the measurement terminal 30A can output the clearance information transmitted from the clearance measurement device 20A, for example by displaying it on the input/output unit 33.
  • the clearance information displayed on the input/output unit 33 can output a variety of information, such as the pass/fail result of the threaded joint 10, and an enlarged cross-sectional view of the interference point of the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12.
  • the control unit 31 can also select various information received from the clearance measurement device 20A via the network 2 and output it from the input/output unit 33. For example, even if clearance information including both pass and fail information is sent from the clearance measurement device 20A to the measurement terminal 30A, the control unit 31 can control the input/output unit 33 to output a failure only when a failure has been sent. Furthermore, since the measurement terminal 30A can communicate with the thread machining device 40A via the communication unit 34 and the network 2, the thread machining device 40A can supply clearance information from the measurement terminal 30A to the thread machining device 40A via the clearance measurement device 20A to correct the interference area.
  • a threaded joint measurement system 1A according to the second example of the embodiment is adopted as a threaded joint measurement system.
  • a threaded joint measurement method according to the second embodiment shown in FIG. 12 is adopted as a method for measuring a threaded joint 10.
  • the clearance measurement device 20 can be configured from a fixed information processing device, or can be configured from a server capable of communicating with the measurement terminal via the network 2.
  • the measurement terminal 30A is configured from an independent terminal capable of communicating with the clearance measurement device 20 via the communication unit 34 and the network 2.
  • control unit 31 of the measurement terminal 30A has the same function as the determination unit 212 in the control unit 21 of the clearance measurement device 20A.
  • control unit 31 may be configured to be able to execute processing similar to that of the determination unit 212 of the clearance measurement device 20A by communicating with the clearance measurement device 20A.
  • the control unit 31 of the measurement terminal 30A can execute the bonding determination process in step ST6 shown in FIG. 12 based on the clearance information received from the clearance measurement device 20A.
  • the measurement terminal 30A can be used independently, making it possible to measure the threaded joint 10 and perform pass/fail judgments at various sites.
  • the determination unit 212 makes a determination based on whether the clearance c between the male thread 13 of the male joint 11 and the female thread 14 of the female joint 12 is equal to or less than a predetermined value as the predetermined criterion, but this is not limited thereto, and the determination may be made based on whether the clearance c is less than a predetermined value as the predetermined criterion.
  • the "Yes" and “No” in step ST414 and step ST437 may be interchanged based on whether the clearance c is equal to or greater than a predetermined value or exceeds a predetermined value as the predetermined criterion. Even in these cases, the predetermined value can be set to a value greater than or equal to 0.
  • the method for measuring a threaded joint can be performed manually or automatically using shape measurement software applied to a handheld 3D scanner, high-end CAD, or the like.
  • the repeated processes of steps ST413 to ST416 and steps ST423 to ST426 described above can be performed using a software program by the control unit 21 of the clearance measurement device 20. This makes it possible to achieve even greater efficiency in the method for measuring a threaded joint.
  • the clearance measurement method, clearance measurement device, threaded joint measurement method, threaded joint measurement system, measurement terminal, threaded joint manufacturing method, and threaded joint quality control method according to the present invention are suitable for application to steel pipe joint structures that join steel pipes.
  • Threaded joint measurement system 2 Network 10 Threaded joint 11 Male joint 12
  • Female joint 13 Male thread 13a, 14a Thread 13b, 14b Thread bottom 14
  • Female thread 15 Pipe 20, 20A Clearance measurement device 21, 31, 41 Control unit 22, 32, 42 Memory unit 23, 33, 43 Input/output unit 24, 34, 44
  • Thread processing unit 211 Clearance calculation unit 212 Determination unit 221 Clearance database 222 Pipe type database 311 Measurement control unit 411 Processing control unit

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

Afin de confirmer efficacement l'assemblage de joints filetés sur des tuyaux, la présente invention concerne un procédé de mesure de jeu, pour une paire de joints filetés ayant un joint mâle et un joint femelle correspondant au joint mâle, destiné à mesurer le jeu entre le filetage du joint mâle et le filetage du joint femelle. Le procédé de mesure de jeu comprend : une étape de définition d'état achevé de jonction destinée à définir un état achevé de jonction dans lequel la jonction du joint mâle et du joint femelle est achevée, sur la base de données sur des formes de filetage du joint mâle et du joint femelle ; une étape de mesure de jeu destinée à mesurer, dans l'état achevé de la jonction, le jeu entre le filetage du joint mâle et le filetage du joint femelle correspondant au filetage du joint mâle ; et une étape de définition d'état de rotation destinée à définir un état dans lequel la rotation est réalisée selon un angle prédéterminé dans une direction telle qu'elle assure le désassemblage de la jonction, si la jonction du joint mâle et du joint femelle n'est pas un état désassemblé après l'étape de mesure de jeu. Les étapes allant de l'étape de mesure de jeu à l'étape de définition d'état de rotation sont exécutées de manière répétée jusqu'à ce que la jonction soit désassemblée.
PCT/JP2023/028725 2022-09-30 2023-08-07 Procédé de mesure de jeu, dispositif de mesure de jeu, procédé de mesure de joint à vis, système de mesure de joint à vis, terminal de mesure, procédé de fabrication de joint fileté et procédé de gestion de qualité de joint fileté WO2024070241A1 (fr)

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JP2022-157597 2022-09-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004144604A (ja) * 2002-10-24 2004-05-20 Seibu Electric & Mach Co Ltd ねじ摩耗量検出装置
JP2004238942A (ja) * 2003-02-06 2004-08-26 Nippon Steel Corp 鋼管杭用ねじ継手及び締結方法
JP2011203108A (ja) * 2010-03-25 2011-10-13 Toshiba Corp ３次元距離計測装置及びその方法
JP2020035434A (ja) * 2018-07-30 2020-03-05 ダッソー システムズ シムリア コーポレイション コンピュータ支援設計によって定められた形状における物体間ギャップの検出

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004144604A (ja) * 2002-10-24 2004-05-20 Seibu Electric & Mach Co Ltd ねじ摩耗量検出装置
JP2004238942A (ja) * 2003-02-06 2004-08-26 Nippon Steel Corp 鋼管杭用ねじ継手及び締結方法
JP2011203108A (ja) * 2010-03-25 2011-10-13 Toshiba Corp ３次元距離計測装置及びその方法
JP2020035434A (ja) * 2018-07-30 2020-03-05 ダッソー システムズ シムリア コーポレイション コンピュータ支援設計によって定められた形状における物体間ギャップの検出

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