EP0119926A1 - Verfahren und Einrichtung zum Anziehen von Schrauben oder dergl. bis zur Elastizitätsgrenze - Google Patents

Verfahren und Einrichtung zum Anziehen von Schrauben oder dergl. bis zur Elastizitätsgrenze Download PDF

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Publication number
EP0119926A1
EP0119926A1 EP84400530A EP84400530A EP0119926A1 EP 0119926 A1 EP0119926 A1 EP 0119926A1 EP 84400530 A EP84400530 A EP 84400530A EP 84400530 A EP84400530 A EP 84400530A EP 0119926 A1 EP0119926 A1 EP 0119926A1
Authority
EP
European Patent Office
Prior art keywords
slope
torque
tightening
theoretical
angle
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.)
Ceased
Application number
EP84400530A
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English (en)
French (fr)
Inventor
Jacques Maugirard
Didier Rey
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.)
TECNIMATIC
Original Assignee
TECNIMATIC
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 TECNIMATIC filed Critical TECNIMATIC
Publication of EP0119926A1 publication Critical patent/EP0119926A1/de
Ceased 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

Definitions

  • the present invention relates to a method and a device for tightening screws or similar screwing members to the limit of elastic deformation.
  • the main object of the invention is therefore to remedy, as far as possible, the drawbacks of the methods and devices of the prior art and to propose an improved method and device which give better satisfaction to the various requirements of the practice, and which in particular provide a very rapid determination of the state of the fixing member leading to an almost instantaneous knowledge of this state, which therefore make it possible to effectively tighten the fixing member until its elastic deformation limit, which makes it possible to determine, at the start of the tightening phase, the qualities of the fixing member to possibly reject the defective fixing members, the device being at the same time compact and inexpensive both in manufacturing and maintenance while being compatible with the clamping tools currently used.
  • measurements are continued to determine the exact final characteristics of the tightening.
  • the determination of the quantities for controlling the rotation or stopping of the clamping device is carried out instantaneously and there is no need to predetermine the characteristics of the assembly to be performed; the clamping is therefore adapted to the particular characteristics of each clamping member, which allows effective clamping up to the limit of elastic deformation of the clamping member, and moreover, because the measurements are continued during from the final phase of tool rotation (due to the inertia of the equipment) from the emission of the stop order, it is ensured to know with the greatest possible precision the characteristics of the tightening finally performed.
  • the device according to the invention can be produced in the form of a particular electronic device. quite compact and / or bulky. It is possible, in this context, to use advanced techniques, such as a microprocessor or a microcomputer which ensures the management of all the means described and which determines, from data previously stored in memory, a sequence optimum operations.
  • Such a miniaturized device allows a predetermination of the operations to be carried out in such a way that, during the tightening process, the calculations are carried out with great speed and that the variations in the forces to which the tightening member is subjected can be followed by real time ; thus, it is possible to precisely achieve a tightening of the fastening member to its own elastic deformation limit, with an extremely minimal residual error due essentially to the inertia of rotation of the tightening member.
  • the speed of the calculations carried out according to a particular algorithm allows that the same device can ensure, thanks to an appropriate multiplexing, the simultaneous control of a large number (for example 20 or more) of clamping members taking into account the specific characteristics of each fixing member and clamping each fixing member to its own limit of elastic deformation.
  • the device of the invention is arranged as follows.
  • a suitable tightening device 2 such as a screwdriver, is rotated by motor means 3 which are placed under the control of control means arranged in accordance to the invention.
  • the clamping device and the motor means can be respectively of types known per se and there is no need to make a detailed description here.
  • a device 4 for measuring the torque actually exerted by the clamping device on the assembly member and a device 5 for measuring the angle of rotation actually traversed by the clamping device 2 The respective outputs of the two measurement devices 4 and 5 are respectively connected to two inputs of a calculation circuit 6 arranged to determine, from these two pieces of information, the practical slope of the tightening characteristic of the assembly considered.
  • control means Other information is provided to the control means.
  • a circuit 10 for displaying a number m such as 0 m ⁇ 0.5 has its output connected to an input of a cir calculation baking 11, a second input of which is connected to the output of the above calculation circuit 9; the calculation circuit 11 is able to determine a theoretical slope deduced from the observed slope by modification of its directing coefficient of the aforementioned ratio m.
  • the outputs of the calculation circuits 6 and 11 are respectively connected to the two inputs of a comparator circuit 12 the output of which is connected to an input of a circuit 13 for controlling positive rotation (that is to say in the direction of the screwing) of the driving means 3.
  • a circuit 15 for displaying a torque value increment has its output connected to a second input of the circuit 13 for controlling the rotation of the motor means 3.
  • a circuit 16 for displaying a rotation angle increment at its output connected to a second input of the circuit 13 for controlling the rotation of the motor means 3.
  • the operating mode of the device in FIG. 1 is as follows.
  • two tightening torque values are also set in a chosen manner so that the maximum precision can be obtained in determining the slope of the torque-angle of rotation characteristic, these two torque values corresponding to a gradient of relatively large torque corresponding to a theoretical slope of the torque-angle characteristic.
  • the assembly member 1 is then screwed on, while measuring two values corresponding to a relatively large torque gradient and a real slope of the torque-angle characteristic is deduced therefrom.
  • the calculation circuit 9 determines an observed slope corresponding to the difference between the values of the pre-tightening and tripping couples; the signal corresponding to this observed slope is supplied to the calculation circuit 11 which, as a function of the value m displayed, determines a theoretical slope which is deduced from the observed slope, by modification of the directing coefficient thereof of the aforementioned ratio m ( 0 m ⁇ 0.5) and which serves as the upper trigger limit for stopping tightening.
  • the comparator circuit 12 compares the output signals of the calculation circuits 6 and 11, in other words compares the practical slope to the theoretical slope, the practical slope being itself determined by the circuit 6 on the basis of the effective torque and the effective angle of rotation, the magnitudes of which are detected in 4 and 5.
  • the control circuit 13 is excited to cause the actuation of the motor means 3 so that the clamping member rotates for a torque increment equal to a fraction of the difference in torques setpoint.
  • a new determination of the practical slope is then made from the new values of the effective torque and the effective angle of rotation, and this practical slope is again compared with the theoretical slope.
  • the cycle continues until the practical slope is equal to or less than the theoretical slope, the instant at which the sign of the output signal from the comparator circuit 12 changes, which causes the control means 13 to de-energize and the Tightening.
  • the clamping member 2 performs a residual rotation between the intervention of the clamping stop control signal and the actual stop of the tool. In view of the fact that this residual rotation may not be negligible, it is expected that the measurements will continue until the tool is effectively stopped, so that the exact final characteristics of the assembly obtained are known.
  • a particularly advantageous implementation of the device of the invention which has just been described in general consists in providing a calculation algorithm making it possible to establish a rule which can be applied to programmed or calculated variables, essentially using simple instructions such as rotation, addition, or complement.
  • the measurement of the torque can be carried out using strain gauges.
  • the signal is planed and not integrated to avoid too long a response time.
  • the angular variation determined from an incrementer during the observation period can be arbitrary and therefore be chosen so that a binary value of the theoretical slope is obtained corresponding to the value offering the most precision.
  • FIG. 2 An example of a technological embodiment of a computing device using the algorithm which has just been presented and capable of managing the device represented in FIG. 1 is presented schematically in FIG. 2.
  • a microprocessor 17 for example of the 8048 type manufactured by IB-TEL (USA), is connected, via address bus 18, to a set 19 for processing information relating to couples and to a set 20 for processing information about angles.
  • microprocessor 17 Given the working speed of the microprocessor 17, it can be envisaged that it controls the operation of several clamping tools by means of multiplexing means known in themselves.
  • the assembly 19 comprises n pairs of input lines connected respectively to the corresponding inputs of n amplifiers 21-1 to 21-n with high gain, for example of the order of 1000 to 2000.
  • the outputs of the n amplifiers 21 are connected to n inputs respectively a multiplexing circuit 22, which can for example be an ADC 816 reference circuit manufactured by NATIONAL SEMI-CONDUCTOR; circuit 22 has a multiplexing control input group connected to the microprocessor by the address bus 18a.
  • the output of the multiplexing circuit 22 is connected to an input of an amplifier 23, which can have a gain of the order of 2 to 500, the other input of which is connected, on the one hand, to the output of a digital-analog converter circuit 24 used for zero adjustment and, on the other hand, for the output of a digital-analog converter circuit 25 for gain adjustment, the input of which is connected to the output of amplifier 23.
  • the output of the amplifier 23 is connected to the input of an analog-digital converter circuit 26.
  • the data bus 18 provides the management links between the microprocessor 17 and the converter circuits 24, 25 and 26.
  • the assembly 20 comprises n pair of input lines connected respectively to the corresponding inputs of n direction of rotation discriminators 27-1 to 27-n connected at output respectively to n binary counting units 28-1 to 28- not ; these are connected to the microprocessor 17 via address and data buses.
  • the microprocessor 17 is programmed to perform, for each clamping member 2, the functions shown in diagrammatic form in FIG. 2, the programming and arrangement of the microprocessor being able to be implemented without difficulty by those skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP84400530A 1983-03-15 1984-03-14 Verfahren und Einrichtung zum Anziehen von Schrauben oder dergl. bis zur Elastizitätsgrenze Ceased EP0119926A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304241 1983-03-15
FR8304241A FR2542886B1 (fr) 1983-03-15 1983-03-15 Procede et dispositif pour serrer des vis ou analogues jusqu'a la limite de deformation elastique

Publications (1)

Publication Number Publication Date
EP0119926A1 true EP0119926A1 (de) 1984-09-26

Family

ID=9286896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400530A Ceased EP0119926A1 (de) 1983-03-15 1984-03-14 Verfahren und Einrichtung zum Anziehen von Schrauben oder dergl. bis zur Elastizitätsgrenze

Country Status (2)

Country Link
EP (1) EP0119926A1 (de)
FR (1) FR2542886B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425703A (en) * 1990-05-07 1995-06-20 Feiring; Andrew J. Method and apparatus for inducing the permeation of medication into internal tissue
CN119223605A (zh) * 2024-11-29 2024-12-31 上海固极智能科技股份有限公司 一种用于螺钉拧紧装置的质量检验方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2312066A1 (fr) * 1975-05-19 1976-12-17 Standard Pressed Steel Co Systeme et procede de serrage de dispositifs de fixation
FR2388644A1 (fr) * 1977-04-26 1978-11-24 Weatherford Lamb Procede et appareil permettant d'etablir une liaison par vissage
US4219921A (en) * 1979-04-19 1980-09-02 Rockwell International Corporation Tension control of fasteners
US4235006A (en) * 1979-04-19 1980-11-25 Rockwell International Corporation Tension control of fasteners
US4259775A (en) * 1979-04-19 1981-04-07 Rockwell International Corporation Tension control of fasteners
FR2485420A1 (fr) * 1979-05-16 1981-12-31 Chicago Pneumatic Tool Co Procede et appareil de serrage d'organes de fixation avec reglage de leur tension

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2312066A1 (fr) * 1975-05-19 1976-12-17 Standard Pressed Steel Co Systeme et procede de serrage de dispositifs de fixation
FR2388644A1 (fr) * 1977-04-26 1978-11-24 Weatherford Lamb Procede et appareil permettant d'etablir une liaison par vissage
US4219921A (en) * 1979-04-19 1980-09-02 Rockwell International Corporation Tension control of fasteners
US4235006A (en) * 1979-04-19 1980-11-25 Rockwell International Corporation Tension control of fasteners
US4259775A (en) * 1979-04-19 1981-04-07 Rockwell International Corporation Tension control of fasteners
FR2485420A1 (fr) * 1979-05-16 1981-12-31 Chicago Pneumatic Tool Co Procede et appareil de serrage d'organes de fixation avec reglage de leur tension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425703A (en) * 1990-05-07 1995-06-20 Feiring; Andrew J. Method and apparatus for inducing the permeation of medication into internal tissue
CN119223605A (zh) * 2024-11-29 2024-12-31 上海固极智能科技股份有限公司 一种用于螺钉拧紧装置的质量检验方法

Also Published As

Publication number Publication date
FR2542886B1 (fr) 1985-08-16
FR2542886A1 (fr) 1984-09-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: MAUGIRARD, JACQUES

Inventor name: REY, DIDIER