EP1000710A1 - Verfahren zum Messen und/oder Ansteuern bei einer Schraubvorrichtung mit einem hydropneumatischen Impulsschrauber - Google Patents

Verfahren zum Messen und/oder Ansteuern bei einer Schraubvorrichtung mit einem hydropneumatischen Impulsschrauber Download PDF

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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
Application number
EP99402779A
Other languages
English (en)
French (fr)
Other versions
EP1000710B1 (de
Inventor
Jean-Marc Lebris
Pascal Jouny
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP1000710A1 publication Critical patent/EP1000710A1/de
Application granted granted Critical
Publication of EP1000710B1 publication Critical patent/EP1000710B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
EP19990402779 1998-11-16 1999-11-08 Verfahren zum Messen und/oder Ansteuern bei einer Schraubvorrichtung mit einem hydropneumatischen Impulsschrauber Expired - Lifetime EP1000710B1 (de)

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 (de) 2000-05-17
EP1000710B1 EP1000710B1 (de) 2006-01-18

Family

ID=9532763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990402779 Expired - Lifetime EP1000710B1 (de) 1998-11-16 1999-11-08 Verfahren zum Messen und/oder Ansteuern bei einer Schraubvorrichtung mit einem hydropneumatischen Impulsschrauber

Country Status (3)

Country Link
EP (1) EP1000710B1 (de)
DE (1) DE69929510T2 (de)
FR (1) FR2785986B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018100802A1 (ja) * 2016-11-30 2018-06-07 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

Citations (4)

* Cited by examiner, † Cited by third party
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 (de) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Impulsschrauber und Verfahren zum Anziehen einer Schraubverbindung mittels des Impulsschraubers
EP0911119A2 (de) * 1997-10-27 1999-04-28 Atlas Copco Tools Ab Verfahren zum Feststellen des Drehmoments in einer mittels drehschlagverschraubten erzeugten Schraubverbindung und Drehschlag-Werkzeug zum Erzeugen einer Schraubverbindung mit vorgegebenem Drehmoment

Patent Citations (4)

* Cited by examiner, † Cited by third party
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 (de) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Impulsschrauber und Verfahren zum Anziehen einer Schraubverbindung mittels des Impulsschraubers
EP0911119A2 (de) * 1997-10-27 1999-04-28 Atlas Copco Tools Ab Verfahren zum Feststellen des Drehmoments in einer mittels drehschlagverschraubten erzeugten Schraubverbindung und Drehschlag-Werkzeug zum Erzeugen einer Schraubverbindung mit vorgegebenem Drehmoment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018100802A1 (ja) * 2016-11-30 2018-06-07 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

Also Published As

Publication number Publication date
EP1000710B1 (de) 2006-01-18
FR2785986A1 (fr) 2000-05-19
FR2785986B1 (fr) 2000-12-29
DE69929510D1 (de) 2006-04-06
DE69929510T2 (de) 2006-07-20

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