EP3025823A1 - Outil d'angle de rotation et de couple - Google Patents

Outil d'angle de rotation et de couple Download PDF

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Publication number
EP3025823A1
EP3025823A1 EP15003360.3A EP15003360A EP3025823A1 EP 3025823 A1 EP3025823 A1 EP 3025823A1 EP 15003360 A EP15003360 A EP 15003360A EP 3025823 A1 EP3025823 A1 EP 3025823A1
Authority
EP
European Patent Office
Prior art keywords
torque
rotation angle
angle
tightening
screw
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.)
Withdrawn
Application number
EP15003360.3A
Other languages
German (de)
English (en)
Inventor
Michael Backhaus
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.)
Stahlwille Eduard Wille GmbH and Co KG
Original Assignee
Eduard Wille GmbH and Co KG
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 Eduard Wille GmbH and Co KG filed Critical Eduard Wille GmbH and Co KG
Publication of EP3025823A1 publication Critical patent/EP3025823A1/fr
Withdrawn legal-status Critical Current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
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means

Definitions

  • the screw connection is the most commonly used connection in mechanical engineering. Such fasteners can only be effective through the use of suitable assembly tools.
  • suitable assembly tools include torque and angle tools, as they are mentioned. Torque tools are needed to apply a specific torque to a workpiece. Torque tools such as torque wrench or torque screwdrivers are known.
  • Indicating torque tools always indicate the respective applied torque.
  • triggering torque tools a setpoint torque is set. Once this torque is achieved when tightening a screw, the torque tool signals the achievement of the desired torque to a user. This can be signaled, for example, by an audible click or tactile click.
  • Torque tools are used to load a bolt with a high preload force that is within the elastic range of the bolt or also to load the bolt with only slight preload forces.
  • new construction materials such as magnesium, aluminum or plastic, especially for lightweight construction in the automotive or aircraft industry can both the demand, as well as the requirements for the torque tools increase. These new materials increase the number of sensitive screw connections. The lower tensile strength of these lightweight materials compared to steel materials would in a Overuse of the screw lead to damage the thread that would make these expensive components unusable.
  • Angle measuring devices for measuring the tightening angle are used inter alia in a rotational angle controlled tightening of screws or nuts.
  • a screw is tightened up to a predetermined setting torque.
  • a screw has set, d. H. All elements involved, such as a screw head, a nut and workpieces to be joined are - after flattening all unevenness - smooth each other. Subsequently, a further tightening by a further rotation by a certain predetermined rotation angle. As a result, an optimal preload force of the screw is achieved.
  • Such tools are used in many ways in the assembly.
  • a fitter has a schedule, which screw he has to tighten in what order with what torque and angle of rotation.
  • a fitter has to tighten ten bolts in this schedule.
  • the installer accidentally double-tightens a screw (e.g., number eight).
  • a screw e.g., number eight
  • the schedule has been completed. Namely, ten screw connections were recorded by the electronic torque wrench. The installer releases the assembly for the next assembly step, although a bolted connection has not been tightened correctly.
  • a screw connection initially has a very flat torque gradient during the assembly process.
  • the torque gradient is defined as an increase in torque over a helix angle interval.
  • the torque gradient is determined solely by the friction losses in the screw thread. If the set torque is reached during an assembly process, i.e., the screw head touches down, the torque gradient increases significantly over the same screw angle interval. The cause is the additionally occurring Unterkopkebung the screw.
  • E torque-angle wrench as a hand-operated tools for controlled tightening a screw. These tools usually detect mechanical stresses in a bending or torsion element with strain gauges. Alternatively, piezocrystals or micromechanical components (MEMS) can be used to detect the mechanical stress. The voltages detected in this way are based on adjusting and further correction parameters in a computer unit converted into a torque. The angle of rotation is usually recorded and calculated with referenceless tools with group or acceleration sensors. Adjustment and further correction parameters are also used here.
  • MEMS micromechanical components
  • the EP 1 310 333 A1 discloses a torque wrench for follow-up pull-on test.
  • the torque wrench described there serves to tighten a pin, such as a screw that is already in a tightened condition.
  • the torque wrench comprises a torque detecting means for detecting a torque when tightening the screw, wherein the torque detecting means is disposed in a wrench body.
  • a rotation angle detection means for detecting a rotation angle of the torque wrench.
  • the rotation angle detecting means is arranged in the wrench body.
  • the torque wrench has a first calculating means for estimating a torque characteristic in a rotating state of the pen in response to input information.
  • the torque characteristic has been recorded in a stable area after the rotation of the pin. It is a characteristic reference characteristic for the torsion set in advance. From the torque information and the rotation angle, the input information is formed.
  • a second arithmetic means estimates a torque characteristic in a stationary state of the stylus obtained from the input information before rotation of the stylus.
  • a torque value at the intersection is determined as a torque measurement.
  • the object of the invention is therefore to avoid the disadvantages of the prior art and to provide a torque and rotation angle tool with simple means which determines uncomplicated whether a screw is already attracted to a target torque and a target rotation angle or not.
  • a bolted connection initially has a very flat torque gradient during the assembly process.
  • the torque gradient is defined as a torque increase over a helix angle interval.
  • the torque gradient initially arises solely by the friction losses in the screw thread. From a set moment, when the screw head touches, the torque gradient increases rapidly over the same screw angle interval. To the thread friction then comes namely the Unterkopokbung the screw. In a rotation angle interval, the increase of the torque gradient from a starting torque to the setting torque is relatively small.
  • the present invention takes advantage of this fact. By determining the respective torque gradient within an angular interval and the comparison with a desired value, it can be determined whether a screw connection has already been tightened or only advanced.
  • This torque-rotation angle tool according to the invention makes the suit of Screw connections safer, because this can be ensured if a screw was actually tightened or forgotten. Often optical controls alone are not sufficient if a pre-tightening of a screw connection already exists.
  • the processor-controlled evaluation device has evaluation means which determine the detected rotation angle at a rated torque and compare it with a desired value.
  • This measure serves to measure and evaluate the torque in relation to a defined angular interval in the case of a fixed screw connection starting from a defined torque.
  • the limit value defines a maximum torque.
  • a torque limit value is individually defined by the user with regard to the screw connection and their behavior in the screwing process. In a loose screw a large angle of rotation is exceeded with a very small torque gradient. The set limit is therefore not reached. On the other hand, if the screw connection has already been advanced or even tightened to a nominal torque, the torque gradient rises very rapidly over a small angle of rotation, so that the torque limit value is reached or exceeded.
  • a further preferred embodiment of the torque and rotational angle tool according to the invention consists in that a display, which is controlled by the evaluation device, signals a deviation of the measured gradient of the tightening torque from the setpoint torque gradient.
  • This measure serves to represent the user when screw connections are not tightened correctly.
  • the flowchart when tightening a set of screws can be displayed. Among other things, it can be shown which screw connections still have to be tightened.
  • the display can also serve to make the torque rotation angle profile visible to the user.
  • the display can also be activated for the operation of the torque / rotation angle tool.
  • the torque and rotation angle tool preferably has an electromechanical, acoustic and / or optical signal generator, which is controlled by the evaluation device.
  • This measure helps the user to recognize when a setpoint value, such as a setpoint torque, a setpoint rotation angle or a setpoint torque gradient has been reached. Other error messages can also be signaled to the user in this way.
  • the signal generator is therefore controlled regularly by the evaluation device.
  • the torque and rotation angle tool has an optical sensor which detects the respective threaded connection to be processed.
  • the optical sensor can be designed, for example, as a photoelement.
  • the optical sensor visually detects a screw connection and arranges it accordingly in the flow chart. In this way it is already possible to visually determine whether a screw has been tightened before or not yet.
  • Fig. 1 is a schematic diagram of an inventive torque-angle wrench 10 is shown.
  • the torque-angle key 10 includes a lever arm 12. At a front end 14 of the lever arm 12, a head portion 16 is provided with a driving part 18. At a rear end 20 of the lever arm 12, a handle 22 is arranged, which is designed as a housing 23. On the handle 22, a display 24 is provided with controls 26. With the operating elements 26 of the torque angle key 10 is set and operated.
  • a torque is transmitted from the handle 22 to the head part 16 via the lever arm 12.
  • the drive part 18 with a plug-in or Plug-on tool 28 is provided at the head part 16.
  • the plug-in or Aufstecktechnikmaschine 28 transmits the torque to a - not shown - screw.
  • the plug-in tool is usually inserted into a square socket profile.
  • the Aufstecktechnikmaschine 28 is plugged accordingly on an external square profile.
  • Below the display 24 and within the handle 22, an electronic control and processing device 30 is provided in the housing 23.
  • the control and processing device 30 is actuated by a user (not shown here) via the operating elements 26 for operating the torque angle-wrench 10.
  • the control and processing device 30 records the acquired measurement data, stores it, and then processes it.
  • the control and processing device 30 controls the display 24, for example, to display the measurement data and / or an evaluation or represent operator menus.
  • the applied torque is measured by means of strain gauges 32 (see FIG. 2 ).
  • the strain gauges 32 are components of a torque measuring device 34.
  • the strain gauges 32 detect the stress in a bending element.
  • the flexure deflects upon application of torque to the torque wrench 10.
  • the strain gages 32 are secured to the flexure and detect the flexing of the flexure. This bending of the flexure is converted by the strain gauges 32 into an electrical signal.
  • the electrical signal which corresponds to the respective applied torque, can be processed by the control and processing device 30.
  • the torque angle wrench 10 further has a rotation angle measuring device 36 for detecting the rotation angle to be measured.
  • the measurement of the rotation angle is started at a start time.
  • the rotational angle measuring device 36 can be started, for example, by the brehmomentmess worn 34.
  • Fig. 2 shows in aphobiassskizze the electronic components 37 of the torque-angle wrench 10 according to the invention one or more strain gauges 32 detect the voltage in the bending element of the torque angle wrench. From this electrical signal, which is generated by the strain gauges 32, the torque applied to the torque angle key 10 is finally determined.
  • the reference numeral 38 denotes an analog signal processing for processing the electrical signals of the strain gauges 32.
  • An analog-to-digital converter 39 converts these processed analog signals into digital signals. The digital values of the signals are fed to a computing and storage unit 40.
  • a gyroscope 42 detects the swept angle of rotation of the rotary angle torque wrench 10. Instead of the gyroscope 42, acceleration sensors may also be used.
  • the signal of the gyroscope 42 is converted via a further analog-to-digital converter 44 into a digital signal. The value of the digital signal is forwarded to the arithmetic and storage unit 40.
  • An optical sensor 46 which is formed for example by a photoelement, detects the respective screw connection to be processed.
  • the signal of the optical sensor 46 is in turn converted via a third analog-to-digital converter 47 into digital values, which are further processed in the computing and storage unit 40.
  • the torque and rotation angle key 10 is operated via the operating elements 26 by a user.
  • the operating elements 26 consist for example of the input elements: keys, decoder and digital interface for setting the desired parameters.
  • the torque measuring device 34 and the rotation angle device 36 are formed by the electronic components strain gauges 32, gyroscope 42, the analog-to-digital converters 39 and 44, and the computing and storage unit 40.
  • the input signals generated by the strain gages 32, the gyroscope 42, the optical sensor 46 and the operating elements 26 are processed by the computing and storage unit 40.
  • the values generated therefrom by the computing and storage unit 40 are output on the display 24, which preferably consists of an OLED display.
  • the computing and storage unit 40 may also drive a signal generator 48, such as LEDs, a buzzer or an electromechanical signal generator.
  • the signal generator 48 is actuated upon reaching a preset torque or angle of rotation of the computing and storage unit 40.
  • Fig. 3 shows in a schematic diagram the torque-rotational angle curve 50 of a screw connection.
  • a screw connection initially has a very flat torque gradient during the assembly process.
  • the torque gradient is defined as a torque increase M 2 -M i / ⁇ 2 - ⁇ 1 over a helix angle interval ⁇ 2 - ⁇ 1 .
  • M is always the name for a torque and ⁇ denotes an angle.
  • the torque gradient is determined by the friction losses in the screw thread alone. If the setting moment is reached during the assembly process, that is to say that the screw head touches down, the torque gradient increases significantly over the same screw angle interval. The cause is the additionally occurring Unterkopkebung the screw.
  • FIG. 1 shows in a schematic diagram the torque-rotational angle curve 50 of a screw connection.
  • Fig. 4 shows in a schematic diagram the torque angle of rotation curve 50 of a fixed screw connection.
  • the torque is applied on the horizontal axis 52 in turn the angle of rotation and on the vertical axis 54.
  • the course starts at the starting torque M 0 , which corresponds to the setting torque.
  • Due to the thread friction of the screw connection and the Unterkopkebung is the increase of the torque-rotational angle curve 50, so the torque gradient M 2 -M 1 / ⁇ 2 - ⁇ 1 , relatively strong.
  • the screw connection is tightened up to the nominal torque.
  • Fig. 5 shows in a schematic diagram the comparison of a fixed and a pre-screwed connection.
  • the torque-rotation angle profile 50 of the preceding screw connection is designated by the reference numeral 56 here.
  • the torque-rotation angle profile 50 of the fixed screw connection is denoted by reference numeral 58 here.
  • the course starts at the starting torque M 0 . It can be seen that the increase of the torque rotation angle profile 50 of the preceding screw connection 56 is flatter than the torque rotation angle profile of the fixed screw connection 58. Comparing the rotational angle profiles 50 of the preceding 56 and the fixed screw connection 58, it can be determined that a setpoint torque Nominal torque M N is achieved by the fixed connection faster by the steeper rise.
  • the torque M 2 -M 1 / ⁇ 2 during the screwing, from a specified starting torque M 0, - ⁇ 1 relative to a predetermined angle interval ⁇ 2 - ⁇ 1 measured and evaluated.
  • the limit value defines a maximum torque gradient.
  • the specifications of the starting torque M 0 , angle interval ⁇ 2 - ⁇ 1 and torque gradients M 2 -M 1 / ⁇ 2 - ⁇ 1 are determined by the user with respect to the screw connection and their behavior in the screwing process. These values may be passed to the torque angle key as parameters, for example, via the controls 26.
  • the torque wrench 10 uses a different approach. During the screwing process, starting from a defined torque, the torque is measured and evaluated in relation to a defined angular interval ⁇ 2 - ⁇ 1 . The limit value defines a maximum torque.
  • the definitions of the starting torque M 0 , angle interval ⁇ 2 - ⁇ 1 and torque limit M N are individually determined by the user with respect to the screw connection and their behavior in the screwing process. These values can be passed to the torque angle key 10 via the controls 26 again as a parameter accordingly. Will the screwing process started with a "loose screw", one first exceeds a large angle of rotation with a very small torque gradient. The set limit is not reached or exceeded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP15003360.3A 2014-11-25 2015-11-25 Outil d'angle de rotation et de couple Withdrawn EP3025823A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202014105672.6U DE202014105672U1 (de) 2014-11-25 2014-11-25 Drehmoment- und Drehwinkelwerkzeug

Publications (1)

Publication Number Publication Date
EP3025823A1 true EP3025823A1 (fr) 2016-06-01

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EP15003360.3A Withdrawn EP3025823A1 (fr) 2014-11-25 2015-11-25 Outil d'angle de rotation et de couple

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EP (1) EP3025823A1 (fr)
DE (1) DE202014105672U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2587491A (en) * 2018-04-13 2021-03-31 Snap On Tools Corp System and method for measuring torque and angle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015208735A1 (de) * 2015-05-12 2016-11-17 Deprag Schulz Gmbh U. Co. Schraubeinheit sowie Verfahren zum Einschrauben einer Schraube in ein Werkstück

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932044A1 (de) * 1978-08-08 1980-02-21 Sps Technologies Vorrichtung zum festziehen einer verbindungsanordnung
DE4118595A1 (de) * 1991-06-06 1992-12-10 Schatz Gmbh Pruefgeraet zum ueberpruefen der qualitaet von schraubverbindungen
US5172616A (en) * 1990-10-13 1992-12-22 Teac Corporation Torque wrench
EP1310333A1 (fr) 2000-08-07 2003-05-14 Tohnichi MFG. Co. Ltd. Cle dynamometrique pour inspection de serrage supplementaire
WO2014053048A1 (fr) * 2012-10-05 2014-04-10 Blackberry Limited Système et procédés permettant d'interagir avec un outil intelligent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932044A1 (de) * 1978-08-08 1980-02-21 Sps Technologies Vorrichtung zum festziehen einer verbindungsanordnung
US5172616A (en) * 1990-10-13 1992-12-22 Teac Corporation Torque wrench
DE4118595A1 (de) * 1991-06-06 1992-12-10 Schatz Gmbh Pruefgeraet zum ueberpruefen der qualitaet von schraubverbindungen
EP1310333A1 (fr) 2000-08-07 2003-05-14 Tohnichi MFG. Co. Ltd. Cle dynamometrique pour inspection de serrage supplementaire
WO2014053048A1 (fr) * 2012-10-05 2014-04-10 Blackberry Limited Système et procédés permettant d'interagir avec un outil intelligent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2587491A (en) * 2018-04-13 2021-03-31 Snap On Tools Corp System and method for measuring torque and angle
GB2587491B (en) * 2018-04-13 2021-08-25 Snap On Tools Corp System and method for measuring torque and angle
US11752604B2 (en) 2018-04-13 2023-09-12 Snap-On Incorporated System and method for measuring torque and angle

Also Published As

Publication number Publication date
DE202014105672U1 (de) 2014-12-02

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