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EP4414133A1 - Tool device for producing an axial clamp based on a shape memory alloy - Google Patents

Tool device for producing an axial clamp based on a shape memory alloy Download PDF

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Publication number
EP4414133A1
EP4414133A1 EP23155717.4A EP23155717A EP4414133A1 EP 4414133 A1 EP4414133 A1 EP 4414133A1 EP 23155717 A EP23155717 A EP 23155717A EP 4414133 A1 EP4414133 A1 EP 4414133A1
Authority
EP
European Patent Office
Prior art keywords
screw
tightening
nut
tool
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23155717.4A
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German (de)
French (fr)
Inventor
Alain Hautcoeur
Florian FOUCHE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nimesis Technology
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Nimesis Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nimesis Technology filed Critical Nimesis Technology
Priority to EP23155717.4A priority Critical patent/EP4414133A1/en
Publication of EP4414133A1 publication Critical patent/EP4414133A1/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B29/00Accessories
    • B25B29/02Bolt tensioners

Definitions

  • the present invention relates to the general field of clamping together two parts to be associated with each other by bolting.
  • the present invention relates more specifically to a tool device allowing the tightening of a bolt screw for holding, one against the other, at least two elements between the head of the screw and the nut of said bolt, in which the axial force on the screw applied during tightening is carried out on the basis of a shape memory alloy, for optimal tightening of the screw.
  • the present invention may find various applications in all fields requiring the association and securing by nut of two parts together, whether in the general field of mechanics, in the field of transport, aeronautics, railways or automobiles etc., and, generally speaking, in all types of industries.
  • the objective is to limit the torsional force applied to the screw, and more specifically to the screw head to prevent it from breaking.
  • the screw head is likely to break by shear if the applied torque is too high and exceeds the breaking limit of said screw head.
  • the present invention aims to remedy, at least in part, the drawbacks of the devices of the state of the art, by proposing a compact tightening tool device, based on a shape memory alloy (SMA) for the application of an axial force for optimal tightening of screws.
  • SMA shape memory alloy
  • the invention relates to a tool for tightening the screw of a bolt in order to hold at least two elements against each other between the head of the screw and the nut of said bolt.
  • the tool for performing the tightening is particular in that it comprises a block or a monolithic part, in particular cylindrical or square, comprising two cavities, one on each of two opposite faces, connected by an orifice with a diameter greater than that of said screw and intended to be passed through by said screw.
  • first cavity of said block intended to come in line with one of the faces of one of said two elements to be tightened and to house said nut, it has at least laterally an opening as well as dimensions generating sufficient clearance for the passage of a tightening tool of said nut.
  • Said first cavity is furthermore delimited by at least one vertical wall, the upper edge of which constitutes a support edge intended to come into contact with said face of the element to be tightened.
  • the second cavity houses a shape memory alloy ring associated with a heater, said AMF ring being intended to be threaded onto said screw, said second cavity also being of dimensions allowing the introduction and manipulation of a second nut to be screwed onto said screw, said second nut coming into contact with said shape memory alloy ring.
  • the invention relates, more particularly, to a tool device 1 for tightening the screw 22 of a bolt 2, so as to hold, one against the other, at least two elements 31, 32 between the head 21 of the screw 22 and the nut 23 of said bolt 2.
  • the two elements 31, 32 to be assembled consist of two flat plates 31, 32 arranged parallel and in contact with each other.
  • the first flat plate 31 comprises a first face 31a on which the head 21 of the screw 22 is intended to come to bear and a second face 31b, opposite said first face 31a, and intended to come into contact, for assembly, with the first face 32a of the second flat plate 32 while, on its second face 32b, said nut 23 of the bolt 2 is intended to come to bear.
  • clamping tool 1 can be used to assemble elements other than flat plates, or more than two elements.
  • the latter is made up of a block 4, in the form of a monolithic part, the latter being able to be, for example but not limited to, of cylindrical or square section.
  • the block 4 of the tool 1 comprises two cavities 5, 6, namely one on each of two opposite faces of said block 4.
  • the two cavities 5, 6, which the block 4 comprises are connected to each other by an orifice 7 intended to be crossed by the screw 22 of the nut 2, said orifice 7 having, for this purpose, a diameter greater than that of said screw 22.
  • the first cavity 5 of said block 4 is intended to come in line with one of the faces 32b of one of said two elements 32 to be tightened.
  • this first cavity 5 also constitutes a housing for the nut 23 which the bolt 2 comprises.
  • said first cavity 5 has at least one lateral opening 8 as well as dimensions generating sufficient clearance, on either side of the nut 23 once the latter is positioned in said cavity 5, mounted on the body of the screw 22, to allow the passage of a tightening tool, such as a wrench, of said nut 23.
  • This first cavity 5 which the block 4 of the tool 1 comprises is delimited on its periphery, with the exception of said at least one lateral access opening 8, by at least one vertical wall 9, the upper edge of which constitutes a support edge 91 intended to come into contact with one of the faces 32b of one of the two elements 32 to be assembled.
  • the second cavity 6 which comprises the monolithic part 4 of the tool device 1 of the invention, this constitutes a housing for receiving, at least, a ring 10 made of shape memory alloy, commonly designated by the acronym AMF, said AMF ring 10 being associated with a heater 11.
  • AMF shape memory alloy
  • the AMF shape memory alloy used for manufacturing the ring 10 that the tightening aid tool 1 of the invention comprises is chosen from copper-based AMF alloys CuAIBe, CuAINi, CuAIMn, CuZnAI, and more generally from copper-based shape memory alloys, and nickel-titanium-based AMF alloys NiTi, NiTiFe, NiTiCu, NiTiCr, NiTiHf and more generally from nickel and titanium-based shape memory alloys, and iron-based alloys FeMnSi, FeMnCr, FeMnCrSi, and more generally from iron and manganese-based shape memory alloys.
  • copper-based AMF alloys CuAIBe, CuAINi, CuAIMn, CuZnAI and more generally from copper-based shape memory alloys
  • nickel-titanium-based AMF alloys NiTi, NiTiFe, NiTiCu, NiTiCr, NiTiHf and more generally from nickel and titanium-based shape memory alloys
  • said ring 10 of the tool 1 is made of AMF alloy chosen from CuAIBe, CuAINi, NiTi, NiTiCu, NiTiHf.
  • This ring 10 by its composition in an AMF alloy, will therefore be able to convert, into movement and/or change of shape, in other words into mechanical energy, the heat received by a source, here the heater 11.
  • Said AMF ring 10, housed in the second cavity 6 of the block 4, is more particularly intended to be threaded onto the body of said screw 22.
  • said second cavity 6 has dimensions that must be sufficient to allow the introduction and handling of a second nut 12 to be screwed onto said screw 22, more particularly at the end of said screw 22 opposite the screw head 23.
  • the AMF 10 ring is in a compressed configuration.
  • the AMF ring 10 is brought to a certain temperature, higher than a threshold temperature, by means of the heating element 11, this threshold temperature allowing said AMF ring 10 to elongate according to the elongation A, to return to its initial shape, before compression.
  • said AMF ring 10 By extending in this way, said AMF ring 10 generates an axial force E on the head 21 of the screw 22, which then comes to bear on the face 31a of the first element 31 of the assembly, while the first nut 23 is moved away from the face 32b of the second element 32 of said assembly of elements 31, 32.
  • the nut 23, positioned in the first cavity 5 of the tool 1 of the invention can then be screwed by means of suitable tightening means, due to the access opening 8 to said first cavity 5, and the suitable dimensions thereof to provide sufficient clearance around the nut 23.
  • FIG 4 illustrates, finally, the loosening of the second nut 12 equipping the tool 1 carrying out a tightening of the screw 22 of the bolt 2 of the invention, making it possible to remove the latter from the body of the screw 22, on which it was held by means of the second nut 12.
  • the latter further comprises means for controlling the tightening force of the screw 22 of the bolt 2.
  • the device 1 of the invention then consists of a tool 1 for producing and also controlling a tightening of the screw 22 of the bolt 2.
  • said tightening control means consist of a force cell 13, or force sensor.
  • Said force cell 13 is advantageously positioned within the second cavity 6 comprised in the monolithic part 4 of the tool 1, and more particularly in contact with said AMF ring 10, interposed between the latter and the block 4.
  • the force cell 13 makes it possible to measure and control, in a closed loop, the tightening torque by regulating the force of the ring 10 in AMF.
  • a force cell consists, in a known manner, of a device for transforming a physical force, in particular a pressure or compression, or even a force or tension, into an electrical signal proportional to this force and which can be measured, converted and analyzed.
  • the force cell 13 therefore performs a measurement of the force Fm (measured force) of the AMF ring 10, when the latter lengthens under the effect of the increase in temperature produced by the heater 11.
  • This measured force Fm is compared, by regulating means 14 with a set force Fc, and possibly corrected, according to the error ⁇ which has been identified between the set and the measurement, by a corrector 15 which is included in said regulating means 14.
  • the corrector 15 sends, to the heater 11, a modified and adequate voltage setpoint U so that the temperature T of said heater 11 is also modified, so that the final force F, provided by the AMF ring 10, is equivalent or substantially equivalent to the setpoint force Fc.
  • This tool 1 for tightening the screw 22, and possibly for checking this tightening is particularly interesting and may find various applications in all types of industries requiring the association of two or more parts with each other, or with each other, by bolting.
  • the tool 1 of the invention allows, by applying an axial force to the head 21 of the screw 22, a considerable limitation of the torsion forces in said screw 22 to be tightened, which reduces, or even completely eliminates, the risks of breakage of the screw 22. the screw head by axial shear, while ensuring maximum and optimum axial clamping force.
  • the tool 1 of the invention in the form of a monolithic part or a block 4 comprising all the elements necessary for the application of the desired axial tightening, allows a significant gain in compactness, and is particularly interesting, in comparison with the hydraulic and pneumatic solutions proposed in the state of the art, involving the use of pumps and valves.
  • the tool 1 of the invention comprises, in a preferred embodiment, means for controlling the axial tightening applied to the screw 22, this makes it possible to ensure control of the tightening torque by regulating the force of the AMF ring 10 against, in particular, a force cell 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

L'invention concerne un outil (1) de réalisation d'un serrage de la vis (22) d'un boulon (2) pour le maintien l'un contre l'autre d'au moins deux éléments (31,32) entre la tête (21) de la vis (22) et l'écrou (23) dudit boulon (2).L'outil comporte un bloc (4) comprenant, une sur chacune de deux faces opposées, deux cavités (5, 6) reliées par un orifice (7) destiné à être traversé par ladite vis (22), la première cavité (5) dudit bloc, destinée à venir au droit de l'une des faces (32b) d'un desdits deux éléments (32) à serrer et à loger ledit écrou, présentant latéralement une ouverture (8) ainsi que des dimensions, générant un dégagement suffisant au passage d'un outil de serrage dudit écrou, ladite cavité (5) étant délimitée par au moins une paroi verticale (9) dont le chant supérieur constitue un bord d'appui (91) destiné à venir en contact de ladite face (32b) de l'élément (32) à serrer, tandis que la deuxième cavité (6) loge une bague (10) AMF associée à un réchauffeur (11), ladite bague étant enfilée sur ladite vis (22), ladite deuxième cavité étant de dimensions permettant l'introduction et la manipulation d'un second écrou (12) à visser sur ladite vis, ledit second écrou venant au contact de ladite bague.Cet outil permet d'assurer une force de serrage axiale optimale de la vis.The invention relates to a tool (1) for tightening the screw (22) of a bolt (2) in order to hold at least two elements (31, 32) against each other between the head (21) of the screw (22) and the nut (23) of said bolt (2). The tool comprises a block (4) comprising, one on each of two opposite faces, two cavities (5, 6) connected by an orifice (7) intended to be passed through by said screw (22), the first cavity (5) of said block, intended to come in line with one of the faces (32b) of one of said two elements (32) to be tightened and to house said nut, having a laterally opening (8) as well as dimensions, generating sufficient clearance for the passage of a tool for tightening said nut, said cavity (5) being delimited by at least one vertical wall (9) whose upper edge constitutes a bearing edge (91) intended to come into contact of said face (32b) of the element (32) to be tightened, while the second cavity (6) houses an AMF ring (10) associated with a heater (11), said ring being threaded onto said screw (22), said second cavity being of dimensions allowing the introduction and manipulation of a second nut (12) to be screwed onto said screw, said second nut coming into contact with said ring. This tool makes it possible to ensure an optimal axial tightening force of the screw.

Description

La présente invention concerne le domaine général du serrage entre elles de deux pièces à associer l'une à l'autre par boulonnage.The present invention relates to the general field of clamping together two parts to be associated with each other by bolting.

La présente invention concerne plus spécifiquement un dispositif outil permettant la réalisation d'un serrage de la vis d'un boulon pour le maintien, l'un contre l'autre d'au moins deux éléments entre la tête de la vis et l'écrou dudit boulon, dans lequel l'effort axial sur la vis appliqué lors du serrage est effectué sur la base d'un alliage à mémoire de forme, pour un serrage optimal de la vis.The present invention relates more specifically to a tool device allowing the tightening of a bolt screw for holding, one against the other, at least two elements between the head of the screw and the nut of said bolt, in which the axial force on the screw applied during tightening is carried out on the basis of a shape memory alloy, for optimal tightening of the screw.

La présente invention pourra trouver des applications variées dans tous les domaines nécessitant l'association et la solidarisation par écrou de deux pièces entre elles, que ce soit le domaine général de la mécanique, dans le domaine du transport, aéronautique, ferroviaire ou automobile etc., et, de manière générale, dans tous types d'industries.The present invention may find various applications in all fields requiring the association and securing by nut of two parts together, whether in the general field of mechanics, in the field of transport, aeronautics, railways or automobiles etc., and, generally speaking, in all types of industries.

Traditionnellement, lors du serrage de vis et d'écrou, l'objectif à atteindre consiste à limiter l'effort en torsion appliqué sur la vis, et plus spécifiquement sur la tête de vis pour éviter que celle-ci ne se rompe.Traditionally, when tightening screws and nuts, the objective is to limit the torsional force applied to the screw, and more specifically to the screw head to prevent it from breaking.

En effet, lors de l'application d'un serrage, et du maintien de la vis ou de l'écrou au moyen d'outil de serrage (clé de serrage), on cherche à atteindre une force axiale maximale de serrage pour obtenir finalement un serrage et un maintien optimaux de deux pièces entre elles.In fact, when applying a tightening, and holding the screw or nut using a tightening tool (tightening wrench), we seek to achieve a maximum axial tightening force to ultimately obtain optimal tightening and holding of two parts together.

Cela étant, en cherchant à atteindre cette limite, on est susceptible de créer un couple de serrage qui s'ajoute à l'effort axial et dont l'effet peut s'avérer supérieur à la résistance des matériaux constituant les éléments de serrage.However, in seeking to reach this limit, one is likely to create a tightening torque which is added to the axial force and the effect of which may prove to be greater than the resistance of the materials constituting the tightening elements.

Par conséquent, en particulier, la tête de la vis est susceptible de casser par cisaillement si le couple appliqué est trop important et supérieur à la limite de rupture de ladite tête de vis.Therefore, in particular, the screw head is likely to break by shear if the applied torque is too high and exceeds the breaking limit of said screw head.

Ainsi, des solutions sont toujours recherchées afin de proposer des moyens ou des outils de serrage pour atteindre un effort axial important et, finalement, une force axiale maximale de serrage, en sorte de permettre un serrage optimal de vis et une bonne solidarisation de deux pièces, ou plus, entre elles, sans risque toutefois d'entrainer une rupture de la tête de vis en réduisant fortement les contraintes de cisaillement.Thus, solutions are always sought in order to propose means or tightening tools to achieve a significant axial force and, ultimately, a maximum axial tightening force, so as to allow optimal tightening. of screws and good bonding of two or more parts together, without the risk of causing the screw head to break by significantly reducing shear stresses.

Dans ce but, il peut être intéressant d'appliquer un effort axial sur les vis, lors de leur serrage.For this purpose, it may be interesting to apply an axial force on the screws when tightening them.

On connait ainsi, de la demande internationale de brevet publiée sous le numéro WO 2006/105931 , un dispositif hydraulique de serrage de boulons filetés, qui permet de serrer des vis de diamètre élevé notamment.We thus know, from the international patent application published under number WO 2006/105931 , a hydraulic device for tightening threaded bolts, which can be used to tighten screws with large diameters in particular.

Cela étant, qu'elles soient hydrauliques ou pneumatiques, le problème majeur des solutions existantes vient de leur encombrement.That being said, whether they are hydraulic or pneumatic, the major problem with existing solutions comes from their bulk.

En effet, l'utilisation de pompes et de valves rendent ces systèmes complexes.Indeed, the use of pumps and valves makes these systems complex.

La présente invention se veut à même de remédier, au moins en partie, aux inconvénients des dispositifs de l'état de la technique, en proposant un dispositif outil de serrage compact, à base d'un alliage à mémoire de forme (AMF) pour l'application d'un effort axial pour un serrage optimal de vis.The present invention aims to remedy, at least in part, the drawbacks of the devices of the state of the art, by proposing a compact tightening tool device, based on a shape memory alloy (SMA) for the application of an axial force for optimal tightening of screws.

A cet effet, l'invention concerne un outil de réalisation d'un serrage de la vis d'un boulon pour le maintien l'un contre l'autre d'au moins deux éléments entre la tête de la vis et l'écrou dudit boulon.For this purpose, the invention relates to a tool for tightening the screw of a bolt in order to hold at least two elements against each other between the head of the screw and the nut of said bolt.

L'outil de réalisation du serrage est particulier en ce qu'il comporte un bloc ou une pièce monolithique, notamment cylindrique ou carré(e), comprenant deux cavités, une sur chacune de deux faces opposées, reliées par un orifice au diamètre supérieur à celui de ladite vis et destiné à être traversé par ladite vis.The tool for performing the tightening is particular in that it comprises a block or a monolithic part, in particular cylindrical or square, comprising two cavities, one on each of two opposite faces, connected by an orifice with a diameter greater than that of said screw and intended to be passed through by said screw.

En ce qui concerne la première cavité dudit bloc, destinée à venir au droit de l'une des faces de l'un desdits deux éléments à serrer et à loger ledit écrou, celle-ci présente au moins latéralement une ouverture ainsi que des dimensions générant un dégagement suffisant au passage d'un outil de serrage dudit écrou. Ladite première cavité est par ailleurs délimitée par au moins une paroi verticale dont le chant supérieur constitue un bord d'appui destiné à venir en contact de ladite face de l'élément à serrer.As regards the first cavity of said block, intended to come in line with one of the faces of one of said two elements to be tightened and to house said nut, it has at least laterally an opening as well as dimensions generating sufficient clearance for the passage of a tightening tool of said nut. Said first cavity is furthermore delimited by at least one vertical wall, the upper edge of which constitutes a support edge intended to come into contact with said face of the element to be tightened.

La deuxième cavité, quant à elle, loge une bague en alliage à mémoire de forme associée à un réchauffeur, ladite bague AMF étant destinée à être enfilée sur ladite vis, ladite deuxième cavité étant par ailleurs de dimensions permettant l'introduction et la manipulation d'un second écrou à visser sur ladite vis, ledit second écrou venant au contact de ladite bague en alliage à mémoire de forme.The second cavity, for its part, houses a shape memory alloy ring associated with a heater, said AMF ring being intended to be threaded onto said screw, said second cavity also being of dimensions allowing the introduction and manipulation of a second nut to be screwed onto said screw, said second nut coming into contact with said shape memory alloy ring.

Selon des modes particuliers de réalisation :

  • l'outil comporte également des moyens de contrôle de la force de serrage de ladite vis ;
  • lesdits moyens de contrôle du serrage sont constitués par une cellule de force positionnée dans ladite deuxième cavité au contact de ladite bague en alliage à mémoire de forme, intercalée entre cette dernière et le bloc.
According to particular embodiments:
  • the tool also includes means for controlling the tightening force of said screw;
  • said tightening control means consist of a force cell positioned in said second cavity in contact with said shape memory alloy ring, interposed between the latter and the block.

D'autres buts et avantages de la présente invention apparaîtront au cours de la description qui va suivre se rapportant à des modes de réalisation qui ne sont donnés qu'à titre d'exemples indicatifs et non limitatifs.Other aims and advantages of the present invention will become apparent during the description which follows relating to embodiments which are given only as indicative and non-limiting examples.

La compréhension de cette description sera facilitée en se référant aux dessins joints en annexe et dans lesquels :

  • [Fig.1] représente une vue schématisée et en coupe longitudinale d'un mode de réalisation particulier d'un dispositif outil conforme à l'invention, pour la réalisation d'un serrage de la vis d'un boulon en sorte de maintenir, l'un contre l'autre au moins deux éléments, consistant ici en deux plaques planes, entre la tête de la vis et l'écrou dudit boulon, lors du positionnement de l'outil de serrage au niveau de la vis à serrer ; ledit outil comprend un bloc venant au contact de l'une des deux plaques planes et ayant deux cavités sur chacune des deux faces opposées de ladite pièce, communiquant par un orifice dans lequel passe la vis, la cavité de la pièce qui est opposée à celle venant en contact de l'une des plaques étant équipée d'une bague en alliage à mémoire de forme (AMF), initialement comprimée, associée à des moyens de chauffage pour permettre un allongement de ladite bague AMF, cette dernière étant destinée à être enfilée sur la vis lors du positionnement de l'outil.
  • [Fig.2] représente une vue schématisée similaire à celle de la figure 1, illustrant le réchauffement de la bague en AMF qui reprend alors sa forme initiale avant compression et s'allonge, l'allongement de ladite bague AMF étant illustré par une flèche double, entrainant un effort axial sur la tête de la vis et le serrage souhaité de l'écrou.
  • [Fig.3] représente une vue schématisée similaire à celles des figures 1 et 2 illustrant le vissage de l'écrou du boulon.
  • [Fig.4] représente une vue schématisée similaire à celles des figures 1 à 3 illustrant le desserrage d'un second écrou servant à maintenir le bloc de l'outil de serrage sur la vis et en appui sur l'une des deux plaques à assembler, et le retrait de l'outil.
  • [Fig.5] représente une vue schématisée et en perspective d'un mode de réalisation particulier d'un dispositif outil de serrage de la vis d'un boulon de l'invention, celui-ci comportant un bloc de forme carrée, cette figure illustrant, d'une part, une ouverture latérale d'accès à la première cavité dudit bloc, permettant d'atteindre et de manipuler l'écrou destiné à se trouver dans cette cavité, ledit écrou n'étant toutefois pas représenté ici et, d'autre part, l'orifice de passage de la vis connectant la première cavité avec une seconde cavité, non visible, que comporte le bloc.
  • [Fig.6] correspond à un organigramme illustrant un schéma d'asservissement de l'effort de la bague AMF pouvant être mis en oeuvre dans un exemple de réalisation de l'outil de serrage de la vis d'un boulon de l'invention.
Understanding of this description will be facilitated by referring to the attached drawings in which:
  • [ Fig.1 ] represents a schematic view and in longitudinal section of a particular embodiment of a tool device according to the invention, for tightening the screw of a bolt so as to maintain, one against the other at least two elements, consisting here of two flat plates, between the head of the screw and the nut of said bolt, during the positioning of the tightening tool at the screw to be tightened; said tool comprises a block coming into contact with one of the two flat plates and having two cavities on each of the two opposite faces of said part, communicating by an orifice in which the screw passes, the cavity of the part which is opposite to that coming into contact with one of the plates being equipped with a ring made of shape memory alloy (AMF), initially compressed, associated with heating means to allow an elongation of said AMF ring, the latter being intended to be threaded onto the screw during the positioning of the tool.
  • [ Fig.2 ] represents a schematic view similar to that of the figure 1 , illustrating the heating of the AMF ring which then returns to its initial shape before compression and lengthens, the lengthening of said AMF ring being illustrated by a double arrow, causing an axial force on the head of the screw and the desired tightening of the nut.
  • [ Fig.3 ] represents a schematic view similar to those of the Figures 1 and 2 illustrating the screwing of the nut of the bolt.
  • [ Fig.4 ] represents a schematic view similar to those of the Figures 1 to 3 illustrating the loosening of a second nut used to hold the clamping tool block on the screw and resting on one of the two plates to be assembled, and the removal of the tool.
  • [ Fig.5 ] represents a schematic and perspective view of a particular embodiment of a tool device for tightening the screw of a bolt of the invention, the latter comprising a square-shaped block, this figure illustrating, on the one hand, a lateral opening for access to the first cavity of said block, making it possible to reach and manipulate the nut intended to be located in this cavity, said nut however not being represented here and, on the other hand, the orifice for passage of the screw connecting the first cavity with a second cavity, not visible, which the block comprises.
  • [ Fig.6 ] corresponds to a flowchart illustrating a diagram for controlling the force of the AMF ring which can be implemented in an exemplary embodiment of the tool for tightening the screw of a bolt of the invention.

En référence aux figures des dessins ci-joints, l'invention concerne, plus particulièrement, un dispositif outil 1 pour la réalisation d'un serrage de la vis 22 d'un boulon 2, en sorte de maintenir, l'un contre l'autre, au moins deux éléments 31, 32 entre la tête 21 de la vis 22 et l'écrou 23 dudit boulon 2.With reference to the figures of the attached drawings, the invention relates, more particularly, to a tool device 1 for tightening the screw 22 of a bolt 2, so as to hold, one against the other, at least two elements 31, 32 between the head 21 of the screw 22 and the nut 23 of said bolt 2.

Sur les figures jointes, les deux éléments 31, 32 à assembler consistent en deux plaques planes 31, 32 disposées parallèlement et en contact l'une sur l'autre.In the attached figures, the two elements 31, 32 to be assembled consist of two flat plates 31, 32 arranged parallel and in contact with each other.

Ainsi, la première plaque plane 31 comporte une première face 31a sur laquelle est destinée à venir, en appui, la tête 21 de la vis 22 et une deuxième face 31b, opposée à ladite première face 31a, et destinée à venir au contact, pour l'assemblage, avec la première face 32a de la deuxième plaque plane 32 tandis que, sur sa deuxième face 32b est destiné à venir, en appui, ledit écrou 23 du boulon 2.Thus, the first flat plate 31 comprises a first face 31a on which the head 21 of the screw 22 is intended to come to bear and a second face 31b, opposite said first face 31a, and intended to come into contact, for assembly, with the first face 32a of the second flat plate 32 while, on its second face 32b, said nut 23 of the bolt 2 is intended to come to bear.

Cela étant, il s'agit là uniquement d'un exemple d'assemblage, et l'outil de serrage 1 conforme à la présente invention peut être mis en oeuvre pour assembler des éléments autres que des plaques planes, ou plus de deux éléments.That being said, this is only an example of assembly, and the clamping tool 1 according to the present invention can be used to assemble elements other than flat plates, or more than two elements.

Selon une caractéristique particulière de l'outil 1 de réalisation du serrage de l'invention, celui-ci est constitué d'un bloc 4, se présentant sous la forme d'une pièce monolithique, cette dernière pouvant être, par exemple mais non limitativement, de section cylindrique ou carrée.According to a particular characteristic of the tool 1 for carrying out the tightening of the invention, the latter is made up of a block 4, in the form of a monolithic part, the latter being able to be, for example but not limited to, of cylindrical or square section.

Le bloc 4 de l'outil 1 comprend deux cavités 5,6 à savoir une sur chacune de deux faces opposées dudit bloc 4.The block 4 of the tool 1 comprises two cavities 5, 6, namely one on each of two opposite faces of said block 4.

Les deux cavités 5, 6, que comporte le bloc 4 sont reliées l'une à l'autre par un orifice 7 destiné à être traversé par la vis 22 de l'écrou 2, ledit orifice 7 présentant, à cet effet, un diamètre supérieur à celui de ladite vis 22.The two cavities 5, 6, which the block 4 comprises are connected to each other by an orifice 7 intended to be crossed by the screw 22 of the nut 2, said orifice 7 having, for this purpose, a diameter greater than that of said screw 22.

La première cavité 5 dudit bloc 4 est destinée à venir au droit de l'une des faces 32b de l'un desdits deux éléments 32 à serrer.The first cavity 5 of said block 4 is intended to come in line with one of the faces 32b of one of said two elements 32 to be tightened.

En outre, cette première cavité 5 constitue également un logement pour l'écrou 23 que comporte le boulon 2.Furthermore, this first cavity 5 also constitutes a housing for the nut 23 which the bolt 2 comprises.

A cet effet, ladite première cavité 5 présente, au moins, une ouverture latérale 8 ainsi que des dimensions générant un dégagement suffisant, de part et d'autre de l'écrou 23 une fois que celui-ci est positionné dans ladite cavité 5, monté sur le corps de la vis 22, pour permettre le passage d'un outil de serrage, type clé, dudit écrou 23.For this purpose, said first cavity 5 has at least one lateral opening 8 as well as dimensions generating sufficient clearance, on either side of the nut 23 once the latter is positioned in said cavity 5, mounted on the body of the screw 22, to allow the passage of a tightening tool, such as a wrench, of said nut 23.

Cette première cavité 5 que comporte le bloc 4 de l'outil 1 est délimitée sur son pourtour, à l'exception de ladite au moins une ouverture latérale d'accès 8, par au moins une paroi verticale 9, dont le chant supérieur constitue un bord d'appui 91 destiné à venir en contact de l'une des faces 32b de l'un des deux éléments 32 à assembler.This first cavity 5 which the block 4 of the tool 1 comprises is delimited on its periphery, with the exception of said at least one lateral access opening 8, by at least one vertical wall 9, the upper edge of which constitutes a support edge 91 intended to come into contact with one of the faces 32b of one of the two elements 32 to be assembled.

En ce qui concerne à présent la deuxième cavité 6 que comporte la pièce monolithique 4 du dispositif outil 1 de l'invention, celle-ci constitue un logement pour la réception, au moins, d'une bague 10 en alliage à mémoire de forme, désigné communément sous le sigle AMF, ladite bague AMF 10 étant associée à un réchauffeur 11.As regards now the second cavity 6 which comprises the monolithic part 4 of the tool device 1 of the invention, this constitutes a housing for receiving, at least, a ring 10 made of shape memory alloy, commonly designated by the acronym AMF, said AMF ring 10 being associated with a heater 11.

Préférentiellement, l'alliage à mémoire de forme AMF utilisé pour la fabrication de la bague 10 que comporte l'outil 1 d'aide au serrage de l'invention est choisi parmi les alliages AMF à base de cuivre CuAIBe, CuAINi, CuAIMn, CuZnAI, et plus généralement parmi les alliages à mémoire de forme à base de cuivre, et les alliages AMF à base de nickel-titane NiTi, NiTiFe, NiTiCu, NiTiCr, NiTiHf et plus généralement parmi les alliages à mémoire de forme à base de nickel et de titane, et les alliages à base de fer FeMnSi, FeMnCr, FeMnCrSi, et plus généralement parmi les alliages à mémoire de forme à base de fer et de manganèse.Preferably, the AMF shape memory alloy used for manufacturing the ring 10 that the tightening aid tool 1 of the invention comprises is chosen from copper-based AMF alloys CuAIBe, CuAINi, CuAIMn, CuZnAI, and more generally from copper-based shape memory alloys, and nickel-titanium-based AMF alloys NiTi, NiTiFe, NiTiCu, NiTiCr, NiTiHf and more generally from nickel and titanium-based shape memory alloys, and iron-based alloys FeMnSi, FeMnCr, FeMnCrSi, and more generally from iron and manganese-based shape memory alloys.

Plus préférentiellement encore, ladite bague 10 de l'outil 1 est en alliage AMF choisi parmi CuAIBe, CuAINi, NiTi, NiTiCu, NiTiHf.More preferably still, said ring 10 of the tool 1 is made of AMF alloy chosen from CuAIBe, CuAINi, NiTi, NiTiCu, NiTiHf.

Cette bague 10, par sa composition en un alliage AMF, va donc être apte à convertir, en déplacement et/ou en changement de forme, autrement dit en énergie mécanique, la chaleur reçue par une source, ici le réchauffeur 11.This ring 10, by its composition in an AMF alloy, will therefore be able to convert, into movement and/or change of shape, in other words into mechanical energy, the heat received by a source, here the heater 11.

Ladite bague AMF 10, logée dans la deuxième cavité 6 du bloc 4, est plus particulièrement destinée à être enfilée sur le corps de ladite vis 22.Said AMF ring 10, housed in the second cavity 6 of the block 4, is more particularly intended to be threaded onto the body of said screw 22.

Par ailleurs, il est à noter également que ladite deuxième cavité 6 présente des dimensions devant être suffisantes pour permettre l'introduction, et la manipulation, d'un second écrou 12 à visser sur ladite vis 22, plus particulièrement au niveau de l'extrémité de ladite vis 22 opposée à la tête 23 de vis.Furthermore, it should also be noted that said second cavity 6 has dimensions that must be sufficient to allow the introduction and handling of a second nut 12 to be screwed onto said screw 22, more particularly at the end of said screw 22 opposite the screw head 23.

Ledit second écrou 12 vient ainsi au contact de ladite bague AMF 10.Said second nut 12 thus comes into contact with said AMF ring 10.

Au moment du positionnement de l'outil 1 au niveau de l'assemblage constitué par les deux éléments 31, 32 d'une part, et par l'écrou 2 d'autre part, ce positionnement étant illustré sur la figure 1, la bague AMF 10 est dans une configuration comprimée.At the time of positioning of the tool 1 at the level of the assembly constituted by the two elements 31, 32 on the one hand, and by the nut 2 on the other hand, this positioning being illustrated on the figure 1 , the AMF 10 ring is in a compressed configuration.

En référence à présent à la figure 2, une fois l'outil 1 positionné sur l'assemblage susmentionné, la bague AMF 10 est portée à une certaine température, supérieure à une température seuil, au moyen de l'élément réchauffeur 11, cette température seuil permettant à ladite bague AMF 10 de s'allonger selon l'allongement A, pour reprendre sa forme initiale, avant compression.Referring now to the figure 2 , once the tool 1 is positioned on the aforementioned assembly, the AMF ring 10 is brought to a certain temperature, higher than a threshold temperature, by means of the heating element 11, this threshold temperature allowing said AMF ring 10 to elongate according to the elongation A, to return to its initial shape, before compression.

En s'allongeant ainsi, ladite bague AMF 10 engendre un effort axial E sur la tête 21 de la vis 22, qui vient alors en appui sur la face 31a du premier élément 31 de l'assemblage, tandis que le premier écrou 23 est éloigné de la face 32b du deuxième élément 32 dudit assemblage d'éléments 31, 32.By extending in this way, said AMF ring 10 generates an axial force E on the head 21 of the screw 22, which then comes to bear on the face 31a of the first element 31 of the assembly, while the first nut 23 is moved away from the face 32b of the second element 32 of said assembly of elements 31, 32.

En référence, à présent, à la figure 3, l'écrou 23, positionné dans la première cavité 5 de l'outil 1 de l'invention, peut alors être vissé par l'intermédiaire de moyens de serrage adaptés, du fait de l'ouverture d'accès 8 à ladite première cavité 5, et des dimensions adaptées de celle-ci pour ménager un dégagement suffisant autour de l'écrou 23.With reference, now, to the figure 3 , the nut 23, positioned in the first cavity 5 of the tool 1 of the invention, can then be screwed by means of suitable tightening means, due to the access opening 8 to said first cavity 5, and the suitable dimensions thereof to provide sufficient clearance around the nut 23.

La figure 4 illustre, finalement, le desserrage du second écrou 12 équipant l'outil 1 réalisation d'un serrage de la vis 22 du boulon 2 de l'invention, rendant possible le retrait de celui-ci du corps de la vis 22, sur lequel il était maintenu au moyen du second écrou 12.There figure 4 illustrates, finally, the loosening of the second nut 12 equipping the tool 1 carrying out a tightening of the screw 22 of the bolt 2 of the invention, making it possible to remove the latter from the body of the screw 22, on which it was held by means of the second nut 12.

On permet ainsi un retrait du bloc 4 et des éléments qui le composent, libérant l'assemblage constitué par les deux plaques 31, 32 à solidariser, d'une part, et par le boulon 2 d'autre part, avec un serrage optimal de la vis 22 dudit boulon 2, l'outil 1 de l'invention ayant permis de limiter, voire de supprimer l'effort en torsion appliqué sur la vis 22.This allows removal of the block 4 and the elements that compose it, releasing the assembly constituted by the two plates 31, 32 to be secured, on the one hand, and by the bolt 2 on the other hand, with optimal tightening of the screw 22 of said bolt 2, the tool 1 of the invention having made it possible to limit, or even eliminate, the torsional force applied to the screw 22.

Selon un exemple de réalisation particulier de réalisation de l'outil 1 de l'invention, celui-ci comporte, en outre, des moyens de contrôle de la force de serrage de la vis 22 du boulon 2.According to a particular exemplary embodiment of the tool 1 of the invention, the latter further comprises means for controlling the tightening force of the screw 22 of the bolt 2.

Le dispositif 1 de l'invention consiste alors en un outil 1 de réalisation et également de contrôle d'un serrage de la vis 22 du boulon 2.The device 1 of the invention then consists of a tool 1 for producing and also controlling a tightening of the screw 22 of the bolt 2.

Tout préférentiellement, et comme illustré sur les figures 1 à 4 des dessins ci-joints, lesdits moyens de contrôle du serrage sont constitués par une cellule de force 13, ou capteur de force.All preferentially, and as illustrated on the Figures 1 to 4 of the attached drawings, said tightening control means consist of a force cell 13, or force sensor.

Ladite cellule de force 13 est avantageusement positionnée au sein de la deuxième cavité 6 que comporte la pièce monolithique 4 de l'outil 1, et plus particulièrement au contact de ladite bague AMF 10, intercalée entre cette dernière et le bloc 4.Said force cell 13 is advantageously positioned within the second cavity 6 comprised in the monolithic part 4 of the tool 1, and more particularly in contact with said AMF ring 10, interposed between the latter and the block 4.

En référence à présent à la figure 6, la cellule de force 13 permet de mesurer et de contrôler, en boucle fermée, le couple de serrage en régulant l'effort de la bague 10 en AMF.Referring now to the figure 6 , the force cell 13 makes it possible to measure and control, in a closed loop, the tightening torque by regulating the force of the ring 10 in AMF.

Plus particulièrement, une cellule de force consiste, de manière connue, en un dispositif permettant de transformer une force physique, notamment une pression ou une compression, ou bien encore une force ou une tension, en un signal électrique proportionnel à cette force et qui peut être mesuré, converti et analysé.More particularly, a force cell consists, in a known manner, of a device for transforming a physical force, in particular a pressure or compression, or even a force or tension, into an electrical signal proportional to this force and which can be measured, converted and analyzed.

Ainsi, par exemple, lorsque la force appliquée au capteur augmente, le signal électrique change proportionnellement.So, for example, when the force applied to the sensor increases, the electrical signal changes proportionally.

Dans l'outil de réalisation d'un serrage de la vis 22 du boulon 2 de l'invention, la cellule de force 13 réalise donc une mesure d'effort Fm (effort mesuré) de la bague AMF 10, lorsque celle-ci s'allonge sous l'effet de l'augmentation de température produite par le réchauffeur 11.In the tool for tightening the screw 22 of the bolt 2 of the invention, the force cell 13 therefore performs a measurement of the force Fm (measured force) of the AMF ring 10, when the latter lengthens under the effect of the increase in temperature produced by the heater 11.

Cette effort mesuré Fm est comparé, par des moyens régulateurs 14 avec un effort de consigne Fc, et éventuellement corrigé, selon l'erreur ε qui a été repérée entre la consigne et la mesure, par un correcteur 15 que comportent lesdits moyens régulateurs 14.This measured force Fm is compared, by regulating means 14 with a set force Fc, and possibly corrected, according to the error ε which has been identified between the set and the measurement, by a corrector 15 which is included in said regulating means 14.

Ainsi, en cas de différence entre l'effort mesuré Fm de la bague AMF 10 par la cellule de force 13 et l'effort de consigne Fc, et tenant compte de perturbations extérieures d éventuelles, le correcteur 15 envoie, au réchauffeur 11, une consigne de tension U modifiée et adéquate pour que la température T dudit réchauffeur 11 soit également modifiée, en sorte que l'effort final F, fourni par la bague AMF 10, soit équivalent ou sensiblement équivalent à l'effort de consigne Fc.Thus, in the event of a difference between the measured force Fm of the AMF ring 10 by the force cell 13 and the setpoint force Fc, and taking into account possible external disturbances, the corrector 15 sends, to the heater 11, a modified and adequate voltage setpoint U so that the temperature T of said heater 11 is also modified, so that the final force F, provided by the AMF ring 10, is equivalent or substantially equivalent to the setpoint force Fc.

Le présent outil 1 de réalisation d'un serrage de la vis 22, et éventuellement de contrôle de ce serrage, est particulièrement intéressant et pourra trouver des applications variées dans tous types d'industries nécessitant l'association de deux ou plusieurs pièces l'une à l'autre, ou les unes aux autres, par boulonnage.This tool 1 for tightening the screw 22, and possibly for checking this tightening, is particularly interesting and may find various applications in all types of industries requiring the association of two or more parts with each other, or with each other, by bolting.

D'une part, l'outil 1 de l'invention permet, par l'application d'un effort axial sur la tête 21 de vis 22, une limitation considérable des efforts de torsion dans ladite vis 22 à serrer, ce qui réduit, voire supprime totalement, les risques de rupture de la tête de vis par cisaillement axial, tout en assurant une force de serrage axiale maximale et optimale.On the one hand, the tool 1 of the invention allows, by applying an axial force to the head 21 of the screw 22, a considerable limitation of the torsion forces in said screw 22 to be tightened, which reduces, or even completely eliminates, the risks of breakage of the screw 22. the screw head by axial shear, while ensuring maximum and optimum axial clamping force.

D'autre part, l'outil 1 de l'invention, se présentant sous la forme d'une pièce monolithique ou d'un bloc 4 comportant l'ensemble des éléments nécessaires à l'application du serrage axial voulu, permet un gain en compacité important, et particulièrement intéressant, en comparaison avec les solutions hydrauliques et pneumatiques proposées dans l'état de la technique, impliquant l'utilisation de pompes et de valves.On the other hand, the tool 1 of the invention, in the form of a monolithic part or a block 4 comprising all the elements necessary for the application of the desired axial tightening, allows a significant gain in compactness, and is particularly interesting, in comparison with the hydraulic and pneumatic solutions proposed in the state of the art, involving the use of pumps and valves.

Finalement, lorsque l'outil 1 de l'invention comporte, dans un mode de réalisation préféré, des moyens de contrôle du serrage axial appliqué sur la vis 22, celui-ci permet d'assurer le contrôle du couple de serrage en régulant l'effort de la bague AMF 10 contre, notamment, une cellule de force 13.Finally, when the tool 1 of the invention comprises, in a preferred embodiment, means for controlling the axial tightening applied to the screw 22, this makes it possible to ensure control of the tightening torque by regulating the force of the AMF ring 10 against, in particular, a force cell 13.

Claims (3)

Outil (1) de réalisation d'un serrage de la vis (22) d'un boulon (2) pour le maintien l'un contre l'autre d'au moins deux éléments (31,32) entre la tête (21) de la vis (22) et l'écrou (23) dudit boulon (2) caractérisé en ce qu'il comporte un bloc ou pièce monolithique (4), cylindrique ou carrée, comprenant, une sur chacune de deux faces opposées, deux cavités (5, 6) reliées par un orifice (7) au diamètre supérieur à celui de ladite vis (22) et destiné à être traversé par ladite vis (22), la première cavité (5) dudit bloc (4), destinée à venir au droit de l'une des faces (32b) de l'un desdits deux éléments (32) à serrer et à loger ledit écrou (23), présentant au moins latéralement une ouverture (8) ainsi que des dimensions, générant un dégagement suffisant au passage d'un outil de serrage dudit écrou (23), ladite cavité (5) étant délimitée par au moins une paroi verticale (9) dont le chant supérieur constitue un bord d'appui (91) destiné à venir en contact de ladite face (32b) de l'élément (32) à serrer, tandis que la deuxième cavité (6) loge une bague (10) en alliage à mémoire de forme associée à un réchauffeur (11), ladite bague AMF (10) étant destinée à être enfilée sur ladite vis (22), ladite deuxième cavité (6) étant de dimensions permettant l'introduction et la manipulation d'un second écrou (12) à visser sur ladite vis (22), ledit second écrou (12) venant au contact de ladite bague (10) en alliage à mémoire de forme.Tool (1) for tightening the screw (22) of a bolt (2) for holding at least two elements (31, 32) against each other between the head (21) of the screw (22) and the nut (23) of said bolt (2) characterized in that it comprises a monolithic block or part (4), cylindrical or square, comprising, one on each of two opposite faces, two cavities (5, 6) connected by an orifice (7) with a diameter greater than that of said screw (22) and intended to be crossed by said screw (22), the first cavity (5) of said block (4), intended to come in line with one of the faces (32b) of one of said two elements (32) to be tightened and to house said nut (23), having at least laterally an opening (8) as well as dimensions, generating sufficient clearance for the passage of a tightening tool of said nut (23), said cavity (5) being delimited by at least one vertical wall (9) whose upper edge constitutes a support edge (91) intended to come into contact with said face (32b) of the element (32) to be tightened, while the second cavity (6) houses a ring (10) made of shape memory alloy associated with a heater (11), said AMF ring (10) being intended to be threaded onto said screw (22), said second cavity (6) being of dimensions allowing the introduction and handling of a second nut (12) to be screwed onto said screw (22), said second nut (12) coming into contact with said ring (10) made of shape memory alloy. Outil (1) de réalisation d'un serrage de la vis (22) d'un boulon (2) selon la revendication 1 caractérisé en ce qu'il comporte également des moyens de contrôle de la force de serrage de ladite vis (22).Tool (1) for tightening the screw (22) of a bolt (2) according to claim 1 , characterized in that it also comprises means for controlling the tightening force of said screw (22). Outil (1) de réalisation et de contrôle d'un serrage de la vis (22) d'un boulon (2) selon la revendication précédente caractérisé en ce que lesdits moyens de contrôle du serrage sont constitués par une cellule de force (13) positionnée dans ladite deuxième cavité (6) au contact de ladite bague (10) en alliage à mémoire de forme, intercalée entre cette dernière et le bloc (4).Tool (1) for performing and controlling the tightening of the screw (22) of a bolt (2) according to the preceding claim , characterized in that said tightening control means consist of a force cell (13) positioned in said second cavity (6) in contact with said ring (10) made of shape memory alloy, interposed between the latter and the block (4).
EP23155717.4A 2023-02-09 2023-02-09 Tool device for producing an axial clamp based on a shape memory alloy Pending EP4414133A1 (en)

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EP23155717.4A EP4414133A1 (en) 2023-02-09 2023-02-09 Tool device for producing an axial clamp based on a shape memory alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23155717.4A EP4414133A1 (en) 2023-02-09 2023-02-09 Tool device for producing an axial clamp based on a shape memory alloy

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996032227A1 (en) * 1995-04-12 1996-10-17 International Patents & Licenses - Russia Ab Method and device for connecting machine elements by draw or pin bolts
US5772378A (en) * 1993-11-30 1998-06-30 Kvaerner Tamturbine Oy Pre-tensioning device for fastening elements and method for pre-tensioning a fastening element
WO2006105931A2 (en) 2005-04-06 2006-10-12 Hohmann Joerg Hydraulic threaded bolt clamping device and method for tightening large screws by means of said hydraulic threaded bolt clamping device
EP2794192A1 (en) * 2011-12-20 2014-10-29 Fasteners Solutions Limited A tensioning apparatus
CN109605284A (en) * 2019-01-31 2019-04-12 中国工程物理研究院机械制造工艺研究所 A kind of tools for bolts ' pretension stretching device and method
US20210138594A1 (en) * 2018-12-11 2021-05-13 Tohnichi Mfg. Co., Ltd. Nut and bolt tightening method and tightening device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772378A (en) * 1993-11-30 1998-06-30 Kvaerner Tamturbine Oy Pre-tensioning device for fastening elements and method for pre-tensioning a fastening element
WO1996032227A1 (en) * 1995-04-12 1996-10-17 International Patents & Licenses - Russia Ab Method and device for connecting machine elements by draw or pin bolts
WO2006105931A2 (en) 2005-04-06 2006-10-12 Hohmann Joerg Hydraulic threaded bolt clamping device and method for tightening large screws by means of said hydraulic threaded bolt clamping device
EP2794192A1 (en) * 2011-12-20 2014-10-29 Fasteners Solutions Limited A tensioning apparatus
US20210138594A1 (en) * 2018-12-11 2021-05-13 Tohnichi Mfg. Co., Ltd. Nut and bolt tightening method and tightening device
CN109605284A (en) * 2019-01-31 2019-04-12 中国工程物理研究院机械制造工艺研究所 A kind of tools for bolts ' pretension stretching device and method

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