WO2024038235A1 - Vis d'assemblage instrumentee - Google Patents
Vis d'assemblage instrumentee Download PDFInfo
- Publication number
- WO2024038235A1 WO2024038235A1 PCT/FR2023/051270 FR2023051270W WO2024038235A1 WO 2024038235 A1 WO2024038235 A1 WO 2024038235A1 FR 2023051270 W FR2023051270 W FR 2023051270W WO 2024038235 A1 WO2024038235 A1 WO 2024038235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- strain gauge
- tightening
- assembly screw
- screw
- threaded part
- Prior art date
Links
Classifications
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B2031/022—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load using an ultrasonic transducer
Definitions
- the present invention relates to the field of controlled tightening and more particularly that using manual tightening keys, such as torque wrenches with triggering or direct reading (mechanical or electronic).
- Controlling the tightening of screw elements can be implemented with different methods, namely by measuring the torque (tightening force), the angle of rotation (conversion of the elongation of the body of the screw with the pitch of the screw). thread) or the elongation of the screw.
- Angle tightening is widely used in the automotive industry. This can be implemented with a manual tightening wrench which includes means for measuring the tightening angle. Tightening to elongation is used for long screws, also called tensioning (manual, hydraulic, or thermal elongation method). Torque tightening is on the contrary the most used method, using either trigger keys or electronic keys and has the advantage of being simple to use. On the other hand, it has the major disadvantage that for a given tightening torque, the force on the screws and therefore the resulting mechanical deformation, varies greatly following the significant dispersion of the apparent coefficient of friction (threading, head support of the screw, face of the nut, brake...), twisting of the body of the screw....
- the main aim of the present invention is therefore to solve the aforementioned problem by allowing real-time knowledge of the value of the tightening torque.
- Another goal is to ensure this knowledge once the connection has been made and possibly becomes inaccessible. Yet another goal is to be able to be informed at any time of a possible loss of tightening.
- an assembly element comprising at least one threaded part and a non-threaded part, characterized in that the non-threaded part is provided with a strain gauge sensitive to the instantaneous elongation of the non-threaded part and an RFID tag connected to the strain gauge by a wired connection, in order to allow the wireless transmission of an electrical resistance value of the strain gauge representative of the instantaneous elongation.
- the assembly screw may have two threaded end portions separated by an unthreaded central portion.
- the strain gauge can be glued or printed on the non-threaded part of the assembly screw and the RFID tag can be glued or printed on the non-threaded part of the assembly screw.
- the strain gauge is advantageously a single-direction resistive tensile strain gauge connected by wire to the RFID tag.
- the RFID tag advantageously includes an active storage chip and a UHF antenna.
- the wire connection is also printed on the unthreaded part of the cap screw.
- the invention also relates to a system for determining the tightening torque of an assembly screw comprising an assembly screw as mentioned above and an RFID reader comprising an RFID antenna and an RFID chip for receiving the electrical resistance value delivered by the strain gauge of the assembly screw, a processing module for determining a tightening torque from this electrical resistance value, and a display for displaying the determined tightening torque.
- the RFID reader includes sound or light means to give the alert in the event of loss of tightening.
- Figure 1 is a sectional view of a tightening key used for tightening an assembly screw
- Figure 2 shows an instrumented assembly screw according to the invention.
- the principle of the invention is based on the instrumentation of an assembly element, screw, stud or bolt, so as to know in real time a characteristic representative of the value of the tightening torque in order to transmit it to a module of external processing capable of exploiting it.
- FIG. 1 illustrates an example of a tightening key 10 used for tightening an assembly screw 12 in order to assemble a first part 14 with a second part 16 tapped to receive the threaded part 12A of the assembly screw.
- a washer 18 is mounted between the head 12B of the assembly screw and the first part 14.
- the angle of rotation is measured by a measuring device 20 which comprises a clamping sleeve 20A cooperating with the head 12B of the screw d assembly and which measures the differential rotation between the socket 20A and the first part 14 by means of a spring 20B arranged around the external periphery of the socket, a Teflon® 20C tube, provided with a non-slip ring 20D, being interposed between the spring 20B and the upper surface of the first part 14.
- the Teflon® tube makes it possible to generate a low coefficient of friction between the moving parts so as not to affect the tightening torque.
- the tightening key further comprises input means to define a setpoint value for tightening and processing means to calculate the tightening torque from the angle of rotation delivered by the device measurement 20 and inform the operator (conventionally by an audible and/or light signal) when the initially defined set point is reached.
- input means to define a setpoint value for tightening
- processing means to calculate the tightening torque from the angle of rotation delivered by the device measurement 20 and inform the operator (conventionally by an audible and/or light signal) when the initially defined set point is reached.
- the non-threaded part 12C of the assembly screw 12 is provided with a strain gauge 22 and an RFID (Radio Frequency IDentification) tag 24 connected thereto. one to the other by a wired connection 26.
- the RFID tag is intended to cooperate remotely with an RFID reader 28, advantageously portable, comprising an antenna/RFID chip assembly 30 connected to a processing module 32 itself connected to a display 34 and/or a speaker.
- the display and/or the speaker can constitute an audible and/or light alert device for the operator in the event of loss of tightening.
- the assembly screw and RFID reader form a system for determining the tightening torque of an assembly screw comprising at least one threaded part and one non-threaded part in order to allow the wireless transmission of a resistance value electrical strain gauge representative of the stretching of this assembly screw.
- the strain gauge (an extensometer with resistant wires conventionally manufactured by a lithographic process from a metal sheet of a few microns and a polyamide type electrical insulator), is preferentially glued to this non-threaded part in order to detect any an instantaneous elongation resulting in a change in electrical resistance of the strain gauge.
- Stick-on resistive strain gauges particularly in single-direction traction, are known in the instrumentation community (characterized by size, resistance to heat/corrosive environment and bonding to different supports). However, the gauge could also be directly produced by printing directly on the barrel (non-threaded part) of the screw.
- the RFID label which can similarly be stuck on the non-threaded part of the assembly screw, comprises an antenna 24A connected to a processing module 24B (called RFID storage chip) comprising a memory and transmission/reception means intended to cooperate with corresponding means of the RFID reader 28.
- the RFID labels to stick are known (characterized by the size, integration / substrate, detection distance by the reader, memory capacity, active or passive nature) .
- the label could also be produced directly by printing directly on the barrel (non-threaded part) of the screw.
- the strain gauge and the RFID tag are connected by two measuring wires forming the wire connection 26.
- the wire connection is advantageously also printed. Placing the strain gauge on the barrel (its non-threaded part) of the assembly screw makes it possible to determine an electrical resistance value depending on the instantaneous elongation of this barrel, which value will be stored in the memory of the RFID chip and therefore can be read at any time by the RFID reader. Appropriate processing known in itself will allow the processing module 32 of the RFID reader to deduce the tightening torque from this value of the electrical resistance and present it to the operator on the display 34 of the RFID reader.
- active or passive, automatic feedback of information to the RFID reader can be considered, in particular with an audible and/or light alert in the event of loss of tightening at this reader.
- a code associated with the torque information will precisely designate the position of the screw in the bolted assembly.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measurement Of Force In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202380060164.0A CN119731440A (zh) | 2022-08-17 | 2023-08-16 | 仪表装配螺钉 |
EP23762257.6A EP4573295A1 (fr) | 2022-08-17 | 2023-08-16 | Vis d'assemblage instrumentee |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FRFR2208344 | 2022-08-17 | ||
FR2208344A FR3138930B1 (fr) | 2022-08-17 | 2022-08-17 | Vis d’assemblage instrumentée |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2024038235A1 true WO2024038235A1 (fr) | 2024-02-22 |
Family
ID=83506133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2023/051270 WO2024038235A1 (fr) | 2022-08-17 | 2023-08-16 | Vis d'assemblage instrumentee |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4573295A1 (fr) |
CN (1) | CN119731440A (fr) |
FR (1) | FR3138930B1 (fr) |
WO (1) | WO2024038235A1 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2852879A1 (fr) | 2003-03-26 | 2004-10-01 | Snecma Moteurs | Cle a serrage controle |
US7293466B2 (en) * | 2005-07-19 | 2007-11-13 | Hitachi, Ltd. | Bolt with function of measuring strain |
US20100054891A1 (en) * | 2008-08-27 | 2010-03-04 | Asahi Electric Works, Ltd. | Fastening apparatus and system for detecting axial force thereof |
US20170138387A1 (en) * | 2013-11-22 | 2017-05-18 | Sannohashi Corporation | Bolt, nut, and strain measurement system |
US10774867B2 (en) * | 2015-05-20 | 2020-09-15 | Sannohashi Corporation | Bolt, control apparatus, and strain measurement system |
US10941802B2 (en) * | 2015-07-13 | 2021-03-09 | Silicon Valley Micro E Corp. | Intelligent washer |
JP2022041452A (ja) * | 2020-09-01 | 2022-03-11 | 国立大学法人茨城大学 | ネジ、および、ネジの締め付け制御方法 |
-
2022
- 2022-08-17 FR FR2208344A patent/FR3138930B1/fr active Active
-
2023
- 2023-08-16 WO PCT/FR2023/051270 patent/WO2024038235A1/fr active Application Filing
- 2023-08-16 EP EP23762257.6A patent/EP4573295A1/fr active Pending
- 2023-08-16 CN CN202380060164.0A patent/CN119731440A/zh active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2852879A1 (fr) | 2003-03-26 | 2004-10-01 | Snecma Moteurs | Cle a serrage controle |
US7293466B2 (en) * | 2005-07-19 | 2007-11-13 | Hitachi, Ltd. | Bolt with function of measuring strain |
US20100054891A1 (en) * | 2008-08-27 | 2010-03-04 | Asahi Electric Works, Ltd. | Fastening apparatus and system for detecting axial force thereof |
US20170138387A1 (en) * | 2013-11-22 | 2017-05-18 | Sannohashi Corporation | Bolt, nut, and strain measurement system |
US10774867B2 (en) * | 2015-05-20 | 2020-09-15 | Sannohashi Corporation | Bolt, control apparatus, and strain measurement system |
US10941802B2 (en) * | 2015-07-13 | 2021-03-09 | Silicon Valley Micro E Corp. | Intelligent washer |
JP2022041452A (ja) * | 2020-09-01 | 2022-03-11 | 国立大学法人茨城大学 | ネジ、および、ネジの締め付け制御方法 |
Also Published As
Publication number | Publication date |
---|---|
FR3138930B1 (fr) | 2024-09-13 |
FR3138930A1 (fr) | 2024-02-23 |
CN119731440A (zh) | 2025-03-28 |
EP4573295A1 (fr) | 2025-06-25 |
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