FR2948454A1 - Under-head torque and axial tension measuring arrangement for determining raised screw-nut connection quality, has units calculating torque and tension using values from strain gauges of arms that are only stressed in compression/traction - Google Patents
Under-head torque and axial tension measuring arrangement for determining raised screw-nut connection quality, has units calculating torque and tension using values from strain gauges of arms that are only stressed in compression/traction Download PDFInfo
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- FR2948454A1 FR2948454A1 FR0955076A FR0955076A FR2948454A1 FR 2948454 A1 FR2948454 A1 FR 2948454A1 FR 0955076 A FR0955076 A FR 0955076A FR 0955076 A FR0955076 A FR 0955076A FR 2948454 A1 FR2948454 A1 FR 2948454A1
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- arms
- torque
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- arrangement according
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- G01L5/243—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed using washers
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
L'invention concerne un agencement de mesure pour établissement du couple de vissage total, du couple sous tête et de la tension axiale d'une connexion à vis à écrou, du type comprenant un dispositif de mesure qui comporte une partie axialement interposée entre deux brides d'appui et pourvue de jauges de contraintes, la vis traversant axialement le dispositif en prenant appui par sa tête et son écrou sur les faces extérieures des brides. The invention relates to a measuring arrangement for establishing the total tightening torque, the under-head torque and the axial tension of a screw-to-nut connection, of the type comprising a measuring device which comprises a portion axially interposed between two flanges. support and provided with strain gauges, the screw passing axially through the device, supported by its head and its nut on the outer faces of the flanges.
La figure 1 représente le principe d'un dispositif de mesure classique du type qui vient d'être énoncé. Ce dispositif comporte un corps tubulaire 1 qui est interposé entre deux brides d'appui 2, 3. La vis 5 traverse axialement ce dispositif et prend appui par sa tête 6 sur la face extérieure de la bride 2 tandis que l'écrou 7 prend appui contre la face extérieure de la bride 3. Le tube 2 porte une jauge JCst destinée à mesurer le couple sous tête Cst et une jauge JFo qui a pour fonction de mesurer la tension axiale Fo appliquée par la vis. La bride 3 comporte deux bras 8 de mesure du couple total Ct à l'aide de jauges JCt, qui sont reliés au bâti du dispositif. Le dispositif connu, selon la figure 1 présente l'inconvénient que le couple sous tête Cst et la tension Fo sont mesurés sur le même tube qui est sollicité à la fois en compression et torsion, ce qui a pour conséquence que les deux valeurs de mesure s'influencent mutuellement. L'invention a pour but de pallier cet inconvénient. Figure 1 shows the principle of a conventional measuring device of the type just stated. This device comprises a tubular body 1 which is interposed between two bearing flanges 2, 3. The screw 5 passes axially through this device and is supported by its head 6 on the outer face of the flange 2 while the nut 7 is supported against the outer face of the flange 3. The tube 2 carries a JCst gauge for measuring the Cst head torque and a JFo gauge whose function is to measure the axial tension Fo applied by the screw. The flange 3 comprises two arms 8 measuring the total torque Ct using JCt gauges, which are connected to the frame of the device. The known device according to FIG. 1 has the disadvantage that the undercost torque Cst and the voltage Fo are measured on the same tube which is stressed both in compression and torsion, which has the consequence that the two measured values influence each other. The invention aims to overcome this disadvantage.
Pour atteindre ce but, l'agencement de mesure selon l'invention est caractérisé en ce que la partie interposée comporte des moyens conçus pour être uniquement sollicités en compression/traction et pourvus de jauges de contraintes de mesure de ces sollicitations, ainsi que des moyens de calcul du couple sous tête Cst et de la tension axiale Fo, à partir de valeurs mesurées par lesdites jauges. To achieve this purpose, the measuring arrangement according to the invention is characterized in that the interposed part comprises means designed to be solely stressed in compression / traction and provided with strain gauges for measuring these stresses, as well as means calculation of the torque under head Cst and the axial tension Fo, from values measured by said gauges.
Selon une caractéristique de l'invention, l'agencement est caractérisé en ce que les moyens précités sont formés par une pluralité de bras qui sont disposés entre les deux organes d'appui de façon à être inclinés par rapport à l'axe du dispositif. Selon une autre caractéristique de l'invention, l'agencement est caractérisé en ce que chaque bras comporte une jauge de contrainte destinée à mesurer les contraintes en compression/traction du bras. According to one characteristic of the invention, the arrangement is characterized in that the aforementioned means are formed by a plurality of arms which are arranged between the two support members so as to be inclined with respect to the axis of the device. According to another characteristic of the invention, the arrangement is characterized in that each arm comprises a strain gauge intended to measure the compressive / tensile stresses of the arm.
Selon encore une autre caractéristique de l'invention, l'agencement est caractérisé en ce que les bras sont montés en zigzag entre les deux organes d'appui de façon que deux bras adjacents présentent le même angle d'inclinaison a par rapport à l'axe du dispositif, mais dans des sens opposés, les jauges étant montées en série afin de constituer deux voies de mesure. Selon encore une autre caractéristique de l'invention, l'agencement est caractérisé en ce que la tension axiale est fonction de la somme des efforts mesurés sur les deux voies. Selon encore une autre caractéristique de l'invention, l'agencement est caractérisé en ce que le couple sous tête est fonction de la différence des efforts mesurés dans les deux voies. According to yet another characteristic of the invention, the arrangement is characterized in that the arms are zigzagged between the two support members so that two adjacent arms have the same angle of inclination with respect to the axis of the device, but in opposite directions, the gauges being mounted in series to form two measurement channels. According to yet another characteristic of the invention, the arrangement is characterized in that the axial tension is a function of the sum of the forces measured on the two channels. According to yet another characteristic of the invention, the arrangement is characterized in that the under-head torque is a function of the difference of the forces measured in the two channels.
Selon encore une autre caractéristique de l'invention, l'agencement est caractérisé en ce que les organes d'appui sont formés par des brides. L'invention sera mieux comprise, et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement dans la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels : - la figure 1 est une vue en perspective, simplifiée, d'un agencement de mesure classique ; - la figure 2 est une vue schématique d'un agencement de mesure selon l'invention, et - la figure 3 est une vue en perspective d'un mode de réalisation de l'agencement selon la figure 2. According to yet another characteristic of the invention, the arrangement is characterized in that the support members are formed by flanges. The invention will be better understood, and other objects, features, details and advantages thereof will appear more clearly in the explanatory description which follows, with reference to the appended schematic drawings given solely by way of example, illustrating a mode of embodiment of the invention and in which: - Figure 1 is a perspective view, simplified, of a conventional measuring arrangement; FIG. 2 is a schematic view of a measurement arrangement according to the invention, and FIG. 3 is a perspective view of an embodiment of the arrangement according to FIG. 2.
En se reportant aux figures 2 et 3, on constate que l'agencement selon l'invention est un système isostatique qui est constitué de deux brides 2 et 3 en forme d'anneaux, qui sont reliés par six bras 10 dont chacun est pourvu d'un capteur de force 11 formé par une jauge qui ne mesure que l'effort en compression et, le cas échéant, en traction. Chaque bras est disposé entre les deux anneaux de façon que l'extrémité 12 reliée à l'anneau 3 du bras 10 soit angulairement décalé par rapport à l'extrémité 13 reliée à l'anneau 2. Chaque bras est donc incliné par rapport à l'axe du dispositif selon un angle a. Les six bras sont disposés en zigzag autour de la périphérie des anneaux de façon que dans l'exemple représenté les extrémités reliées au même anneau, qui se succèdent autour des anneaux soient placées sensiblement au même endroit. Dans ces conditions, les six bras 10 indépendants sont sollicités uniquement en compression/traction. Les sollicitations des six bras 10 sont indiquées par les indications Fl à F6. Les jauges 11 respectives des bras pairs et impairs sont montées en série de façon à constituer deux voies de mesure. La tension Fo est fonction de la somme des efforts sur ces deux voies. Le couple Cst est fonction de leur différence. La force ou tension axiale Fo et le couple sous tête Cst peuvent être ainsi établis par calcul à partir des valeurs mesurées Fl à F6 selon les formules suivantes, l'angle a étant l'angle d'inclinaison des bras 10 par rapport à l'axe de l'agencement de mesure. Fo = cosa((Fl + F3 + F5 ) + (F2 + F4 + F6)) Cst = Rxsina((Fl + F3 + F5 ) - (F2 + F4 + F6)). Comme il ressort de la description qui vient d'être faite, l'invention permet de mesurer indépendamment la tension axiale Fo et le couple sous tête Cst. Autrement dit, l'invention propose un agencement de mesure dans lequel la tension n'exerce aucune influence sur le couple sous tête et réciproquement. L'agencement est insensible à l'excentration de la charge. L'invention atteint donc son but en faisant en sorte que le corps de mesure est uniquement sollicité en compression/traction, sans flexion, torsion ou cisaillement. Bien entendu des multiples modifications peuvent être apportées à la structure qui est représentée à la figure 2 et n'est données qu'à titre d'exemple simplifié reflétant le principe de la structure d'un agencement selon l'invention. Ainsi la figure 3 montre un mode de réalisation d'un agencement dans lequel les extrémités de deux bras successives ne sont pas reliées à l'anneau respectif au même endroit. Cependant on constate que deux bras adjacents 10 sont toujours inclinés selon le même angle par rapport à l'axe de l'agencement, mais dans des directions opposées.20 With reference to FIGS. 2 and 3, it can be seen that the arrangement according to the invention is an isostatic system which consists of two rings 2 and 3 in the form of rings, which are connected by six arms 10 each of which is provided with a force sensor 11 formed by a gauge which measures only the compressive force and, where appropriate, in tension. Each arm is disposed between the two rings so that the end 12 connected to the ring 3 of the arm 10 is angularly offset relative to the end 13 connected to the ring 2. Each arm is inclined relative to the axis of the device at an angle a. The six arms are arranged zigzag around the periphery of the rings so that in the example shown the ends connected to the same ring, which follow each other around the rings are placed substantially in the same place. Under these conditions, the six independent arms 10 are stressed only in compression / traction. The stresses of the six arms 10 are indicated by the indications Fl to F6. The respective gauges 11 of the even and odd arms are connected in series so as to constitute two measurement channels. The voltage Fo is a function of the sum of the forces on these two paths. The Cst couple is a function of their difference. The axial force or tension Fo and the undercost torque Cst can thus be established by calculation from the measured values F1 to F6 according to the following formulas, the angle a being the angle of inclination of the arms 10 with respect to the axis of the measuring arrangement. Fo = cosa ((Fl + F3 + F5) + (F2 + F4 + F6)) Cst = Rxsina ((Fl + F3 + F5) - (F2 + F4 + F6)). As can be seen from the description that has just been given, the invention makes it possible to independently measure the axial tension Fo and the undercost torque Cst. In other words, the invention proposes a measurement arrangement in which the voltage has no influence on the torque under the head and vice versa. The arrangement is insensitive to the eccentricity of the load. The invention thus achieves its purpose by ensuring that the measuring body is only stressed in compression / traction, without bending, twisting or shearing. Of course, many modifications can be made to the structure shown in FIG. 2 and is given only as a simplified example reflecting the principle of the structure of an arrangement according to the invention. Thus Figure 3 shows an embodiment of an arrangement in which the ends of two successive arms are not connected to the respective ring at the same location. However, it is found that two adjacent arms 10 are always inclined at the same angle to the axis of the arrangement, but in opposite directions.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0955076A FR2948454B1 (en) | 2009-07-21 | 2009-07-21 | MEASUREMENT ARRANGEMENT FOR ESTABLISHING TORQUE AND AXIAL TENSION OF A NUT SCREW CONNECTION |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0955076A FR2948454B1 (en) | 2009-07-21 | 2009-07-21 | MEASUREMENT ARRANGEMENT FOR ESTABLISHING TORQUE AND AXIAL TENSION OF A NUT SCREW CONNECTION |
Publications (2)
Publication Number | Publication Date |
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FR2948454A1 true FR2948454A1 (en) | 2011-01-28 |
FR2948454B1 FR2948454B1 (en) | 2011-09-23 |
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FR0955076A Expired - Fee Related FR2948454B1 (en) | 2009-07-21 | 2009-07-21 | MEASUREMENT ARRANGEMENT FOR ESTABLISHING TORQUE AND AXIAL TENSION OF A NUT SCREW CONNECTION |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3408310A1 (en) * | 1984-03-07 | 1984-10-04 | Eberhard Dipl.-Ing. 6301 Wettenberg Seidel | Measuring device for separately measuring the axial clamping force and the fastening torque and the components of the latter arising from the thread friction and head friction of a bolted joint without superposition of tensile and torsional stress |
SU1185128A1 (en) * | 1984-02-08 | 1985-10-15 | Институт Машиноведения Им.А.А.Благонравова | Multicomponent coordinate pickup,its versions |
JPS6263827A (en) * | 1985-08-15 | 1987-03-20 | Yokogawa Electric Corp | Force/torque detecting device |
FR2623284A1 (en) * | 1987-11-13 | 1989-05-19 | Logabex | SPACE EFFORTS SENSOR |
US5339696A (en) * | 1993-03-31 | 1994-08-23 | Advanced Mechanical Technology, Inc. | Bolt torque and tension transducer |
US5569866A (en) * | 1994-11-02 | 1996-10-29 | Allison; Malcolm M. | Force measuring device |
EP0987532A2 (en) * | 1998-09-15 | 2000-03-22 | Test GmbH | Measuring device for determining the overall starting torque, the friction moment of a screw head and the pre-stressing force of a tightened screw connection |
-
2009
- 2009-07-21 FR FR0955076A patent/FR2948454B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1185128A1 (en) * | 1984-02-08 | 1985-10-15 | Институт Машиноведения Им.А.А.Благонравова | Multicomponent coordinate pickup,its versions |
DE3408310A1 (en) * | 1984-03-07 | 1984-10-04 | Eberhard Dipl.-Ing. 6301 Wettenberg Seidel | Measuring device for separately measuring the axial clamping force and the fastening torque and the components of the latter arising from the thread friction and head friction of a bolted joint without superposition of tensile and torsional stress |
JPS6263827A (en) * | 1985-08-15 | 1987-03-20 | Yokogawa Electric Corp | Force/torque detecting device |
FR2623284A1 (en) * | 1987-11-13 | 1989-05-19 | Logabex | SPACE EFFORTS SENSOR |
US5339696A (en) * | 1993-03-31 | 1994-08-23 | Advanced Mechanical Technology, Inc. | Bolt torque and tension transducer |
US5569866A (en) * | 1994-11-02 | 1996-10-29 | Allison; Malcolm M. | Force measuring device |
EP0987532A2 (en) * | 1998-09-15 | 2000-03-22 | Test GmbH | Measuring device for determining the overall starting torque, the friction moment of a screw head and the pre-stressing force of a tightened screw connection |
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FR2948454B1 (en) | 2011-09-23 |
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