EP1000710A1 - Procédé de mesure et/ou de commande d'un équipement de vissage comprenant une visseuse hydropneumatique à martèlement - Google Patents
Procédé de mesure et/ou de commande d'un équipement de vissage comprenant une visseuse hydropneumatique à martèlement Download PDFInfo
- Publication number
- EP1000710A1 EP1000710A1 EP99402779A EP99402779A EP1000710A1 EP 1000710 A1 EP1000710 A1 EP 1000710A1 EP 99402779 A EP99402779 A EP 99402779A EP 99402779 A EP99402779 A EP 99402779A EP 1000710 A1 EP1000710 A1 EP 1000710A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screwdriver
- torque
- screwing
- maximum
- signal
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
- B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/1405—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers for impact wrenches or screwdrivers
Definitions
- the present invention relates to screwdrivers hammer type hydropneumatics.
- hammering means in this context, the operation of screwdrivers including the drive shaft does not rotate at constant speed, but in angular steps successively successive, which applies to the object to be tightened (screws, nut, bolt, etc.) torques jerky tightening.
- FIG. 1A of the accompanying drawings shows a view in section the test assembly used by the Applicant during these investigations.
- This test assembly included two pieces P1 and P2 to be tightened one against the other using a screw V.
- part P1 was a plastic plate relatively stiff and part P2 was a sheet metal metallic.
- the screw passed through a smooth hole T1 in the part P1 and was screwed into a threaded hole T2 on the other room.
- a stress sensor C which measured the stress exerted by the head of the screw V on the face of the part P1 during the various phases of the tightening operation at using a hammering screwdriver.
- the pace of the stress as a function of time recorded by this sensor C is shown by curves A in Figures 2 and 3.
- Figure 2 shows these curves for a hammering screwdriver with automatic sound cut-off pneumatic supply, this cut occurring when the value of the tightening torque chosen by the operator is reached during a tightening operation and Figure 3 shows similar curves, but for a hammering screwdriver without automatic cut-off pneumatic supply.
- the start of tightening also corresponds to a constant overall shape (curve A) of the stress while the parts P1 and P2 are brought to bear one on the other. Then, during the hammering cycles t 1 to t n-1 , the stress increases steadily in stages in the assembly until reaching a constant value which reflects the completion of the tightening of the assembly.
- the peaks of the peaks of curve B representative of the tightening torque applied to each stroke of the screwdriver vary considerably and irregularly from one cycle to the next cycle, so that from the peak information provided by the torque sensor, it is impossible to deduce whether the assembly was tightened to the correct stress value or not.
- the peak at the start of cycle t n-2 is much higher than that of cycles t n-1 and t n
- curve A shows that the final stress only settles in the assembly. at the end of period t n .
- This phenomenon of irregularity of the torque applied to the screw V comes from several factors with difficulty controllable and varying considerably, particularly in depending on the surface condition of the assembly parts (presence of grease or dirt on the parts), number of superimposed components of the assembly, more or less compressible materials of parts etc.
- peak irregularities may occur both for a screwdriver with automatic cut-off only for a screwdriver without this cut-off.
- Figure 4 represents on a scale of time of a much higher resolution, the shape of one of the peaks in the diagrams of Figures 2 and 3, such peak corresponding to a blow of the screwdriver, being understood that all of the peaks have roughly a profile overall similar.
- each peak is preceded by a time stop (phase P1) of the screwdriver during which the torque is substantially zero, followed by a phase P2 of abrupt rise to an absolute maximum M1 (which is actually the only maximum value visible at each peak on the Figures 2 and 3).
- the P4 phase begins with the abrupt relaxation of the effort provided by the screwdriver (the step is completed) of so that the applied torque decreases to zero.
- a new hammering cycle begins by creating a tightening torque profile which can generally have the same shape as that of the cycle previous, but with maximum and minimum values different, precisely because of all the factors of uncertainty listed above.
- a next cycle of a process tightening may have a shape such as that shown in Figure 5 in which the directions of variations in the tightening torque are roughly similar, however that the values of the cusps of the curve are all different.
- the couple M1a necessary to "take off” the screw by applying a twist to it here is only a relative maximum, lower than the absolute maximum torque M4a which will increase the stress installed in the assembly during this cycle of pounding.
- the present invention proposes to exploit these knowledge of the assembly process carried out using a hydro hammer screwdriver and it therefore aims to provide a process either to measure the installed torque using a sensor interposed between the screwdriver and the assembly either order a hydropneumatic hammer screwdriver allowing to stop the screwing when the stress nominal rating is installed in a screw connection.
- the invention further aims to provide equipment for the implementation of this measurement and / or control method.
- the invention also consists in detecting in each of said cycles of said measurement signal, at least one other maximum, to memorize the value of this other maximum at during the next cycle of this signal and to display said value if during the current cycle of said signal only one maximum is detected.
- an operator can cause easily stop the screwdriver by observing the display by manual shutdown of the power supply.
- the stopping of said screwdriver is brought about automatically by cutting off its power, by means a stop signal generated, following detection a single maximum during the current cycle of said signal of measurement.
- Figure 1 very schematically shows a hammering screwdriver 1 fitted with equipment electronic 2, the assembly being designed for setting work of the method according to the invention.
- the screwdriver 1 essentially comprises a body 3 having an anatomical shape so that it can easily be handled by hand.
- This body 3 contains the mechanical components known per se of the screwdriver, among which we only see represented the drive shaft 4, a torque sensor 5 and an end cap coupling 6 intended to cover the head of a screw, a nut, or another similar screwable member, when tightening a assembly. Also shown schematically a connection 7 for pneumatic supply of the screwdriver and an actuation button 8.
- the structure of the screwdriver 1 itself does not form part of the invention, it does not will not be described further.
- the hammering consists in applying the clamping force during cycles of rotation of the nozzle 6 around its axis, the cycles succeeding one another very quickly.
- Screwdrivers of this type are sold by example by the company ATLAS COPCO S-10523, Sweden or by DGD GmbH, Postfach 30, D 73461 WESTHAUSEN / WüRTH, Germany.
- the sensor 5 can be produced using gauges constraint placed on the drive shaft 4 of the screwdriver and properly connected to provide an electrical voltage across the sensor representative of the tightening torque applied to the nozzle 6.
- the sensor 5 terminals are connected to electronic equipment 2 which includes a filter analog 9 to clear the sensor signal, a amplifier 10 connected to filter 9 followed by analog / digital converter 11, a filter digital 12, a processing module 13 and a display 14.
- the processing module 13 includes a microprocessor (not shown) capable of executing a program whose essential stages are illustrated on Figure 7 and which will be described later.
- the module 13 may possibly generate a signal cut off the pneumatic supply of the screwdriver 1, this signal can then transit on a line 15.
- FIG. 7 represents a flowchart which can be executed in the processing module 13 of FIG. 1 for implementing the method according to the invention.
- This flow chart takes place during each process of Tightening.
- the program illustrated by the flowchart in Figure 7 is triggered in E1 when a new tightening process begins.
- Operation E2 consists of find a first maximum value M1 (figure 4) of the torque value from the signal from the sensor 5, this signal being shaped, amplified and digitized in the filtering, amplification and of conversion 9 to 12 of figure 1.
- Operation E3 consists in detecting in the signal whether the maximum value M1 is followed by a relative minimum M2 corresponding to a dip in the torque profile. A test is then carried out in step E4 to find out whether the point of relative minimum M2 is followed by a relative maximum point (search for point M3) corresponding to a second peak of the couple profile.
- the program goes to a stage E5 evaluation of the value of the tightening torque which is that corresponding to the maximum observed. This value is then displayed during a step E6 on the dial of the screwdriver. The operator stops the tightening process.
- step E4 finds the presence of a second peak, a test is carried out during the stage E7 to determine whether a new tightening cycle has start. If this is not the case, it is because the screwdriver has been stopped by the operator and in this case the value of the second or third peak stored during previous cycle is calculated in E8 and the value corresponding is displayed by step E6.
- step E7 If on the contrary, during the test of step E7, it turns out that a new hammering cycle has started, again searches for an absolute maximum in E9 followed by the search for a new relative minimum in E10, these steps being analogous to steps E2 and E3.
- step E10 a test is performed in E11 to know if the first peak is followed by a second Crete. If the answer is negative, we calculate in E12 the value of the second or third peak of the profile torque from the previous cycle, which then corresponds to the nominal value of the torque applied to the assembly. This value stored during the previous cycle is displayed by step E6 during the current cycle and the operator can stop the screwdriver.
- the program waits for the hammering cycle. following by performing the test in step E13. If there is a cycle following the loop is again traversed by the steps E9, E10 and E11.
- step E13 proves negative is that the assembly is tight and the value of the second or third peak of the torque profile of the previous cycle is displayed during step E12.
- the display step E6 can be carried out at the same time as a step E14 consisting in controlling the automatic shutdown of the screwdriver via the command line 15. Note that this cut automatic will be performed according to the torque of tightening actually applied to the assembly for y install the required voltage.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
- une visseuse à martèlement hydropneumatique comportant un arbre d'entraínement qui, par l'intermédiaire d'un embout de vissage, peut appliquer un couple de serrage à des moyens de vissage par lesquels un assemblage doit être serré, la visseuse comprenant également un capteur de couple qui est associé audit arbre d'entraínement et qui délivre un signal de mesure représentant le couple instantané transmis par ledit embout sur lesdits moyens de vissage, ce signal de mesure comprenant une succession de cycles, respectivement représentatifs de l'évolution du couple de serrage pendant les coups successifs appliqués par la visseuse sur lesdits moyens de vissage, et
- des moyens de commande pour arrêter la visseuse, lorsque le couple de serrage atteint une valeur prédéterminée,
- détecter au moins un maximum dans chacun desdits cycles dudit signal; et
- arrêter la visseuse dès que le nombre de maximums dans un cycle est au plus égal à un.
- la figure 1 est un schéma très simplifié d'une visseuse à martèlement et de son appareillage de commande, ce dernier étant apte à mettre en oeuvre le procédé de mesure et/ou de commande selon l'invention;
- la figure 1A est une vue en coupe d'un assemblage d'essai utilisé par la demanderesse ;
- la figure 2 est un diagramme en fonction du temps illustrant le fonctionnement d'une visseuse à martèlement dont l'alimentation pneumatique est coupée lorsque la visseuse fournit un couple de serrage égal à celui affiché par l'opérateur;
- la figure 3 est un diagramme analogue à celui de la figure 2, mais portant sur une visseuse dont l'alimentation pneumatique reste appliquée, même lorsque le couple de serrage souhaité est atteint;
- les figures 4 à 6 représentent, à une échelle temporelle très agrandie par rapport aux figures 2 et 3, la forme d'une partie de l'une des courbes du diagramme de ces figures, pour différentes phases de fonctionnement de la visseuse;
- la figure 7 montre un organigramme simplifié du procédé mis en oeuvre selon l'invention, dans l'appareillage représenté à la figure 1.
Claims (6)
- Procédé de mesure et/ou de commande d'un équipement de vissage comprenantune visseuse à martèlement hydropneumatique (1) comportant un arbre d'entraínement (4) qui, par l'intermédiaire d'un embout de vissage (6), peut appliquer un couple de serrage à des moyens de vissage (V, T2) par lesquels un assemblage doit être serré, la visseuse comprenant également un capteur de couple (5) qui est associé audit arbre d'entraínement (4) et qui délivre un signal de mesure représentant le couple instantané transmis par ledit embout (6) sur lesdits moyens de vissage (V, T2), ce signal de mesure comprenant une succession de cycles, respectivement représentatifs de l'évolution du couple de serrage pendant les coups successifs appliqués par la visseuse (1) sur lesdits moyens de vissage, etdes moyens de commande (8) pour arrêter la visseuse (1), lorsque le couple de serrage atteint une valeur prédéterminée,détecter au moins un maximum (M1, M3, M5; figure 4) dans chacun desdits cycles dudit signal; etarrêter la visseuse (1) dès que le nombre de maximums dans un cycle est au plus égal à un (Mn; figure 6).
- Procédé suivant la revendication 1, caractérisé en ce qu'il consiste à détecter dans chacun desdits cycles dudit signal de mesure, au moins un autre maximum (M3, M5), à mémoriser la valeur de cet autre maximum au cours du cycle suivant de ce signal et à afficher ladite valeur si, pendant le cycle en cours dudit signal un seul maximum (Mn) est détecté.
- Procédé suivant l'une quelconque des revendications 1 et 2, caractérisé en ce que l'arrêt de ladite visseuse (1) est provoqué automatiquement par coupure de son alimentation (7), au moyen d'un signal d'arrêt (15) engendré, à la suite de la détection d'un seul maximum (Mn) pendant le cycle en cours dudit signal de mesure.
- Equipement de vissage commandé par le procédé selon l'une quelconque des revendications 1 à 3, comprenant une visseuse (1) à martèlement hydropneumatique comportant un arbre d'entraínement (4) qui, par l'intermédiaire d'un embout de vissage (6), peut appliquer un couple de serrage à des moyens de vissage (V, T2) par lesquels un assemblage doit être serré, la visseuse (1) comprenant également un capteur de couple (5) qui est associé audit arbre d'entraínement (4) et qui délivre un signal de mesure représentant le couple instantané transmis par ledit embout (6) sur lesdits moyens de vissage (V, T2), ce signal de mesure comprenant une succession de cycles, respectivement représentatifs de l'évolution du couple de serrage pendant les coups successifs appliqués par la visseuse sur lesdits moyens de vissage, et des moyens de commande (8) pour arrêter la visseuse (1), lorsque le couple de serrage atteint une valeur prédéterminée,
caractérisé en ce que lesdits moyens de commande comprennent également des moyens d'analyse (9 à 13) de chacun des cycles dudit signal de mesure, lesdits moyens d'analyse étant agencés pour fournir ladite valeur prédéterminée de couple, dès qu'un cycle dudit signal de mesure ne présente qu'un seul maximum (Mn). - Equipement suivant la revendication 4 pour la mise en oeuvre du procédé suivant la revendication 2, caractérisé en ce que lesdits moyens de commande comprennent des moyens de coupure manuels (8) de ladite alimentation et des moyens (14) pour afficher ladite valeur prédéterminée.
- Equipement suivant la revendication 4 pour la mise en oeuvre du procédé suivant la revendication 3, caractérisé en ce que lesdits moyens de commande comprennent des moyens (15) connectés auxdits moyens d'analyse et capables de provoquer l'arrêt automatique de la visseuse (1), lorsque ladite valeur prédéterminée de couple est atteinte.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9814353 | 1998-11-16 | ||
FR9814353A FR2785986B1 (fr) | 1998-11-16 | 1998-11-16 | Procede de mesure et/ou de commande d'un equipement de vissage comprenant une visseuse hydropneumatique a martelement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1000710A1 true EP1000710A1 (fr) | 2000-05-17 |
EP1000710B1 EP1000710B1 (fr) | 2006-01-18 |
Family
ID=9532763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990402779 Expired - Lifetime EP1000710B1 (fr) | 1998-11-16 | 1999-11-08 | Procédé de mesure et/ou de commande d'un équipement de vissage comprenant une visseuse hydropneumatique à martèlement |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1000710B1 (fr) |
DE (1) | DE69929510T2 (fr) |
FR (1) | FR2785986B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018100802A1 (fr) * | 2016-11-30 | 2018-06-07 | パナソニックIpマネジメント株式会社 | Outil rotatif à percussion |
FR3144031A1 (fr) * | 2022-12-26 | 2024-06-28 | Etablissements Georges Renault | Dispositif de vissage à gain et/ou fréquence de coupure variable en fonction du couple de serrage objectif |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243069A1 (de) * | 1992-12-18 | 1994-06-23 | Gardner Denver Gmbh | Impulswerkzeug, insbesondere Impulsschrauber |
DE4429282A1 (de) * | 1994-08-18 | 1996-02-22 | Cooper Ind Inc | Hydro-Impulsschrauber insbesondere zum Anziehen von Schraubverbindungen |
EP0724935A2 (fr) * | 1995-02-03 | 1996-08-07 | Robert Bosch Gmbh | Clé à choc et procédé pour serrer un raccord à vis avec cette clé à choc |
EP0911119A2 (fr) * | 1997-10-27 | 1999-04-28 | Atlas Copco Tools Ab | Procédé pour déterminer le couple installé dans une connection vissée par serrage à percussion et outil à percussion rotative pour serrer une connection vissée avec un couple prédéterminé |
-
1998
- 1998-11-16 FR FR9814353A patent/FR2785986B1/fr not_active Expired - Fee Related
-
1999
- 1999-11-08 EP EP19990402779 patent/EP1000710B1/fr not_active Expired - Lifetime
- 1999-11-08 DE DE69929510T patent/DE69929510T2/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243069A1 (de) * | 1992-12-18 | 1994-06-23 | Gardner Denver Gmbh | Impulswerkzeug, insbesondere Impulsschrauber |
DE4429282A1 (de) * | 1994-08-18 | 1996-02-22 | Cooper Ind Inc | Hydro-Impulsschrauber insbesondere zum Anziehen von Schraubverbindungen |
EP0724935A2 (fr) * | 1995-02-03 | 1996-08-07 | Robert Bosch Gmbh | Clé à choc et procédé pour serrer un raccord à vis avec cette clé à choc |
EP0911119A2 (fr) * | 1997-10-27 | 1999-04-28 | Atlas Copco Tools Ab | Procédé pour déterminer le couple installé dans une connection vissée par serrage à percussion et outil à percussion rotative pour serrer une connection vissée avec un couple prédéterminé |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018100802A1 (fr) * | 2016-11-30 | 2018-06-07 | パナソニックIpマネジメント株式会社 | Outil rotatif à percussion |
JP2018089705A (ja) * | 2016-11-30 | 2018-06-14 | パナソニックIpマネジメント株式会社 | インパクト回転工具 |
FR3144031A1 (fr) * | 2022-12-26 | 2024-06-28 | Etablissements Georges Renault | Dispositif de vissage à gain et/ou fréquence de coupure variable en fonction du couple de serrage objectif |
WO2024141234A1 (fr) * | 2022-12-26 | 2024-07-04 | Etablissements Georges Renault | Dispositif de vissage à gain et/ou fréquence de coupure variable en fonction du couple de serrage objectif |
Also Published As
Publication number | Publication date |
---|---|
DE69929510T2 (de) | 2006-07-20 |
FR2785986B1 (fr) | 2000-12-29 |
EP1000710B1 (fr) | 2006-01-18 |
DE69929510D1 (de) | 2006-04-06 |
FR2785986A1 (fr) | 2000-05-19 |
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