EP2895300B1 - Schlaganzugswerkzeug - Google Patents

Schlaganzugswerkzeug Download PDF

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Publication number
EP2895300B1
EP2895300B1 EP13786144.9A EP13786144A EP2895300B1 EP 2895300 B1 EP2895300 B1 EP 2895300B1 EP 13786144 A EP13786144 A EP 13786144A EP 2895300 B1 EP2895300 B1 EP 2895300B1
Authority
EP
European Patent Office
Prior art keywords
torque
value
screw
angular acceleration
output shaft
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.)
Active
Application number
EP13786144.9A
Other languages
English (en)
French (fr)
Other versions
EP2895300A4 (de
EP2895300A1 (de
Inventor
Susumu Matsunaga
Kouji Sakata
Shinichirou SETO
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.)
Yokota Industrial Co Ltd
Original Assignee
Yokota Industrial Co Ltd
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Publication date
Application filed by Yokota Industrial Co Ltd filed Critical Yokota Industrial Co Ltd
Publication of EP2895300A1 publication Critical patent/EP2895300A1/de
Publication of EP2895300A4 publication Critical patent/EP2895300A4/de
Application granted granted Critical
Publication of EP2895300B1 publication Critical patent/EP2895300B1/de
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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
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • 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
    • B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components

Definitions

  • the present invention relates to an impact tightening tool to be used for tightening a screw.
  • an impact tightening tool (1) comprising a rotating part (2), angular acceleration detection means (3), torque value calculation means (4), and a storage section (5), wherein: the rotating part (2) includes a rotary power source (21), an impact tightening generation mechanism (22), and an output shaft (23); the angular acceleration detection means (3) is configured to detect an angular acceleration value of the rotary power source (21); the torque value calculation means (4) is configured to calculate an actual torque approximate value of the output shaft (23).
  • Screws are used for fastening parts together. A screw will loosen if the tightening torque is insufficient and, on the contrary, excessive torque may cause failure of the screw. Therefore, when tightening a screw, it is essential to perform a tightening operation with a proper torque.
  • impact tightening tools which perform tightening of a screw with successive blows are widely used.
  • tightening operation is performed such that when a preset tightening torque (proper tightening torque) is reached, the torque transmission to the screw is stopped, thereby maintaining a proper tightening torque.
  • Implementations of the stopping of torque transmission to the screw may be exemplified by such as one in which a rotary power source (for example, a motor) of the impact tightening tool is stopped or broken, and one in which the torque transmission from the drive source to the screw is disengaged.
  • Impact tightening tools of this type have been already disclosed in JP S614676 A and JP 4560268B B2 .
  • the tightening torque of the tool is determined by acquiring a twist amount (strain amount) of a power transmission shaft with a strain gauge provided in the power transmission shaft, and the motor is stopped when the tightening torque reaches a preset value.
  • This is convenient for tightening a screw with a proper torque.
  • the operation to paste a strain gauge onto the power transmission shaft is very delicate, it requires skilled work and poses high cost.
  • a problem exists in that the tool as a whole increases in size, as well as in weight.
  • the tightening torque of the tool is calculated from the inertia of the rotating part including a motor, and the angular acceleration value obtained based on the position sensor information owned by the driving side of the impact tightening generation mechanism.
  • the output shaft becomes not to include a strain gauge so that the impact tightening tool becomes reduced in size and weight.
  • actual tightening torque in an impact tightening tool can be represented as follows.
  • the impact tightening tool according to JP 4560268B B2 does not take into account e(t). Because of this, measure values of torque of the impact tightening tool according to JP 4560268B B2 tended to be larger than actual torque values since various loss torques that occur in the transmission system e(t) are not taken into account. As a result of that, the impact tightening tool according to JP 4560268B B2 has a problem in that the tightening operation is automatically stopped before a proper tightening torque is reached (the timing of automatic stopping is too early).
  • the impact tightening tool of JP 2005 212022 A fastens a screw member by the torque of a main shaft applied by impact force, by converting the torque of an air motor into intermittent impact by an impact generating mechanism.
  • a fastening controlling controller for controlling the fastening of the screw member is stored in a grip for gripping a tool itself by hand.
  • a base board is stored in the grip. A part for constituting the fastening controlling controller, is incorporated into the base board.
  • the impact tightening tool according to claim 1 is used.
  • the impact tightening tool of the present invention has become an impact tightening tool which enables the calculation of an actual torque approximate value which takes into account the loss caused by actual impact tightening, without an expensive strain gauge provided on the output shaft, thus enabling improved tightening.
  • Fig. 1 shows a partial cross-sectional view and a general side view of an impact tightening tool 1.
  • Fig. 2 is a conceptual diagram of an impact tightening tool performing the measurement of a torque measured value before the torque transmission to a screw.
  • Fig. 3 is a conceptual diagram of an impact tightening tool at the time of torque transmission to a screw.
  • Fig. 4 is a conceptual diagram showing the measurement of a torque measured value by using a torque tester.
  • Formula 1 shows an example of the formula for calculating an actual torque approximate value T, represented by a first-order equation.
  • the impact tightening tool 1 which includes a rotating part 2, angular acceleration detection means 3, torque value calculation means 4, and a storage section 5, is configured to tighten a screw with a preset torque value and include control means 13 for stopping tightening at a preset torque value.
  • the impact tightening tool 1 may also include approximation formula derivation means 6.
  • the impact tightening tool 1 may include a trigger 11 for performing rotating operation of the rotating part 2, as well as a rotational direction designating lever 12 for designating the rotational direction.
  • a trigger 11 for performing rotating operation of the rotating part 2 is referred to such as an impulse wrench and an impact wrench.
  • the impact tightening tool 1 includes at least a calibration mode and a tightening mode.
  • the calibration mode is a mode in which storing operation into the storage section 5 is performed
  • the tightening mode is a mode in which a screw is tightened with a preset torque.
  • the rotating part 2 rotates upon pulling of the trigger 11, and stops upon releasing of the trigger 11.
  • the rotating part 2 includes a rotary power source 21, an impact tightening generation mechanism 22, and an output shaft 23.
  • the rotary power source 21 may utilize an electric motor, an air motor, and the like.
  • the output shaft 23 may be provided with a socket 8 at its front end.
  • the impact tightening tool 1 calculates a current, actual torque approximate value T by using an approximation formula stored in the storage section 5 while tightening the screw.
  • the control means 13 stops the rotary power source 21 thereby terminating tightening.
  • the control means 13 signals the operator with such as sound and light to release the trigger 11. The confirmation that the preset torque value is reached is performed when the actual torque approximate value T exceeds the preset torque value.
  • the angular acceleration detection means 3 is configured to detect an angular acceleration value X of the rotary power source 21.
  • the angular acceleration detection means 3 is made up at least of a rotor 31, a sensor 32, and differentiation means 33, as shown in Fig. 2 .
  • the rotor 31 is connected to the above described rotary power source 21 so as to rotate in tandem.
  • the sensor 32 detects a rotational angle THETA of the rotor 31.
  • the differentiation means 33 differentiates the detected rotational angle THETA twice to detect an angular acceleration. That is, differentiating rotational angle THETA with respect to time t will result in angular velocity OMEGA, and further differentiating angular velocity OMEGA with respect to time t will result in angular acceleration.
  • This value of angular acceleration is an angular acceleration value X.
  • the differentiation means 33 for detecting the angular acceleration value X may utilize an arithmetic processing unit to be described later.
  • the torque value calculation means 4 is configured to calculate an actual torque approximate value T of the output shaft 23 from the angular acceleration value X by using an approximation formula stored in the storage section 5.
  • the approximation formula is a formula which correlates the angular acceleration value X detected by the angular acceleration detection means 3 at the time of torque transmission to the screw with the actual torque value of the output shaft 23 at the time of torque transmission to the screw.
  • the arithmetic processing unit may be used as the torque value calculation means 4 to calculate an actual torque approximate value T.
  • a calculation circuit corresponding to the above described approximation formula may be made up in place of the arithmetic processing unit, to be used as the torque value calculation means 4.
  • Fig. 5 is a graph comparing a tightening torque indicated in the conventional art with an actual tightening torque.
  • Formula 1 is an approximation formula, which is based on a torque measured value Y of the output shaft 23 measured before the torque transmission to the screw.
  • Math 1 T Y 2 ⁇ Y1 X 2 ⁇ X1 X + Y 1 ⁇ Y 2 ⁇ Y1 X 2 ⁇ X1 X1
  • a torque tester 7 having a torque sensor 71 and a torque indicator 72 is prepared.
  • the impact tightening tool 1 is activated in a preprogrammed calibration mode.
  • the torque sensor 71 is attached and fixed to the output shaft 23 of the impact tightening tool 1 so that the torque measured value Y of the output shaft 23 is measured by the torque tester 7 (see Fig. 5 ).
  • the angular acceleration values (X1, X2) and the torque measured values (Y1, Y2) are substituted into Formula 1 to derive an approximation formula which is a first-order equation between the angular acceleration value X and the actual torque approximate value T.
  • the derived approximation formula of a first-order equation is stored in the storage section 5, and when the storing operation into the storage section 5 is finished, the impact tightening tool 1 is switched from the calibration mode to a tightening mode.
  • an actual torque approximate value T is calculated by using the stored approximation formula of a first-order equation based on the angular acceleration value X detected by the angular acceleration detection means 3 at the time of torque transmission to the screw.
  • the storage section 5 may be configured to store angular acceleration values (X1, X2) of the rotary power source 21 measured before the torque transmission to the screw, and torque measured values (Y1, Y2) of the output shaft 23 measured by the torque tester 7 before the torque transmission to the screw.
  • the impact tightening tool 1 When the storage section 5 stores the angular acceleration values (X1, X2) and the torque measured values (Y1, Y2), the impact tightening tool 1 includes approximation formula derivation means 6. In this case as well, when the storing operation into the storage section 5 is finished, the impact tightening tool 1 is switched from the calibration mode to the tightening mode.
  • the approximation formula derivation means 6 substitutes "the angular acceleration values (X1, X2) and the torque measured values (Y1, Y2) stored in the storage section 5" into the "formula (Formula 1) which correlates the angular acceleration value X detected by the angular acceleration detection means 3 at the time of torque transmission to the screw with the actual torque value of the output shaft 23 at the time of torque transmission to the screw” to derive a "formula (approximation formula of a first-order equation) based on the torque measured value Y of the output shaft 23 measured before the torque transmission to the screw.”
  • the torque value calculation means 4 calculates the actual torque approximate value T of the output shaft 23 by using the approximation formula of a first-order equation derived by the approximation formula derivation means 6 based on the angular acceleration value X detected by the angular acceleration detection means 3 at the time of torque transmission to the screw.
  • the storage section 5 stores data such as "the approximation formula of a first-order equation between the angular acceleration value X and the actual torque approximate value T" or "the angular acceleration values (X1, X2) of the rotary power source 21 measured before the torque transmission to the screw, and the torque measured values (Y1, Y2) of the output shaft 23 measured by the torque tester 7 before the torque transmission to the screw.”
  • Examples of the storage section 5 storing these data may include a flash memory.
  • the impact tightening tool 1 may incorporate a flash memory, and also include an access terminal to the flash memory.
  • the access terminal enables data storage by external electronic devices.
  • the impact tightening tool 1 does not need to include an input key which is used in the operation for storing data in the flash memory. This will allow the reduction in size and weight of the impact tightening tool 1.
  • the flash memory may be a removable small one, such that it may be removable from the interior of the impact tightening tool 1.
  • the removed small flash memory can be mounted to an external electronic device to make the flash memory store the above described data. Then, the small flash memory that has stored the above described data is mounted to the impact tightening tool 1.
  • the above described approximation formula of torque will not be limited to Formula 1 and a first-order equation between the angular acceleration value X and the actual torque approximate value T, and can be exemplified by linear approximation, polynomial approximation, power approximation, exponential approximation, log approximation, the spline interpolation, and so on.
  • the number of measurement points may be 2 to n points ([X1, X2, ..., Xn : Y1, Y2, ..., Yn], where n is an arbitrary number) in correspondence with the approximation formula.
  • the differentiation means 33, the torque value calculation means 4, the storage section 5 and the approximation formula derivation means 6 can be combined and installed in the impact tightening tool 1 as hardware or software so that the actual torque approximate value T can be calculated by using various mathematical algorithms including the above described methods.
  • the calculated actual torque approximate value T becomes close to the torque measured value Y shown in Fig. 5 so that the impact tightening tool 1 enables better torque management.
  • the impact tightening tool 1 becomes reduced in size and weight, and moreover inexpensive, even though it can obtain a relatively accurate actual torque approximate value T.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Claims (3)

  1. Schlagschrauber (1), das ein rotierendes Teil (2), eine Winkelbeschleunigungs-Erfassungseinrichtung (3), eine Drehmomentwert-Berechnungseinrichtung (4) und einen Speicherabschnitt (5) aufweist, wobei:
    das rotierende Teil (2) eine Rotationsleitungsquelle (21), einen Schlagschraubermechanismus (22) und eine Ausgangswelle (23) beinhaltet;
    die Winkelbeschleunigungs-Erfassungseinrichtung (3) so konfiguriert ist, dass sie einen Winkelbeschleunigungswert der Rotationsleistungsquelle (21) erfasst;
    die Drehmomentwert-Berechnungseinrichtung (4) so konfiguriert ist, dass sie einen Ist-Drehmomentnäherungswert der Ausgangswelle (23) berechnet;
    die Drehmomentwert-Berechnungseinrichtung (4) den Ist-Drehmomentnäherungswert der Ausgangswelle (223) durch Verwenden einer Näherungsformel berechnet, die in dem Speicherabschnitt (5) gespeichert ist; dadurch gekennzeichnet, dass
    die Näherungsformel, die in den Speicherabschnitt (5) gespeichert ist, eine Formel ist, die einen Winkelbeschleunigungswert, der durch die Winkelbeschleunigungs-Erfassungseinrichtung (3) zum Zeitpunkt der Drehmomentübertragung auf eine Schraube erfasst wird, mit einem Ist-Drehmomentwert der Ausgangswelle (23) zum Zeitpunkt der Drehmomentübertragung auf die Schraube korreliert, und eine Formel basierend auf einem Drehmoment-Messwert der Ausgangswelle (23) ist, der vor der Drehmomentübertragung auf die Schraube gemessen wird.
  2. Schlagschrauber nach Anspruch 1, dadurch gekennzeichnet, dass die Formel basierend auf dem Drehmoment-Messwert durch Einsetzen eines Winkelbeschleunigungswerts von der Rotationsleistungsquelle (21), der vor der Drehmomentübertragung auf die Schraube gemessen wird, und eines Drehmomentmesswerts von der Ausgangswelle (23), der durch eine Drehmomentprüfeinrichtung (7) vor der Drehmomentübertragung auf die Schraube gemessen wird, in die korrelierte Formel abgeleitet wird.
  3. Schlagschrauber (1) nach Anspruch 1, gekennzeichnet durch eine Näherungsformel-Ableitungseinrichtung (6), wobei:
    die Näherungsformel durch die Näherungsformel-Ableitungseinrichtung (6) abgeleitet wird;
    der Speicherabschnitt (5) einen Winkelbeschleunigungswert der Rotationsleistungsquelle (21), der vor der Drehmomentübertragung auf eine Schraube gemessen wird, und einen Drehmomentmesswert der Ausgangswelle (23), der durch eine Drehmomentprüfeinrichtung (7) vor der Drehmomentübertragung auf die Schraube gemessen wird, speichert; und
    die Näherungsformel-Ableitungseinrichtung (6) so konfiguriert ist, dass sie eine Formel basierend auf dem Drehmomentmesswert der Ausgangswelle (23), der vor der Drehmomentübertragung auf die Schraube gemessen wird, durch Einsetzen des Winkelbeschleunigungswerts und des Drehmomentmesswerts, die in dem Speicherabschnitt (5) gespeichert sind, in eine Formel ableitet, die den Winkelbeschleunigungswert, der durch die Winkelbeschleunigungs-Erfassungseinrichtung (3) zum Zeitpunkt der Drehmomentübertragung auf die Schraube erfasst wird, mit dem Ist-Drehmomentwert der Ausgangswelle (23) zum Zeitpunkt der Drehmomentübertragung auf die Schraube korreliert.
EP13786144.9A 2012-09-13 2013-05-21 Schlaganzugswerkzeug Active EP2895300B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012201414A JP5877468B2 (ja) 2012-09-13 2012-09-13 衝撃締付工具
PCT/JP2013/003226 WO2014041723A1 (en) 2012-09-13 2013-05-21 Impact tightening tool

Publications (3)

Publication Number Publication Date
EP2895300A1 EP2895300A1 (de) 2015-07-22
EP2895300A4 EP2895300A4 (de) 2016-06-08
EP2895300B1 true EP2895300B1 (de) 2018-04-04

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Application Number Title Priority Date Filing Date
EP13786144.9A Active EP2895300B1 (de) 2012-09-13 2013-05-21 Schlaganzugswerkzeug

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EP (1) EP2895300B1 (de)
JP (1) JP5877468B2 (de)
WO (1) WO2014041723A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6135925B2 (ja) * 2013-07-19 2017-05-31 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及びインパクト回転工具用先端アタッチメント
JP6395075B2 (ja) * 2014-03-31 2018-09-26 パナソニックＩｐマネジメント株式会社 インパクト工具用アタッチメント及びインパクト工具
JP6917453B2 (ja) * 2016-11-21 2021-08-11 厚 飛 胡 高速回転レンチ及びその高速回転レンチに用いるモーターの保護方法
JP6984082B2 (ja) * 2017-08-25 2021-12-17 京都機械工具株式会社 ドライバユニット
CN109465630A (zh) * 2018-12-21 2019-03-15 南京林城亿轮轨道交通技术有限公司 一种智能化扭矩操作监管系统及控制方法
WO2021167668A1 (en) * 2020-02-17 2021-08-26 Apex Brands, Inc. Automatic torque calibration

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
FR2527714A1 (fr) * 1982-05-26 1983-12-02 Renault Procede de serrage d'un assemblage comportant un element d'assemblage filete
JPH0624713B2 (ja) 1984-06-15 1994-04-06 ヨコタ工業株式会社 インパルスレンチの締付トルク制御装置
JPH0435878A (ja) * 1990-05-31 1992-02-06 Matsushita Electric Works Ltd 電動ドライバー
SE519292C2 (sv) 2001-04-17 2003-02-11 Atlas Copco Tools Ab Metod och verktyg innefattande bestämning av överfört moment som funktion av retardation och tröghetsmoment
JP2007167959A (ja) * 2003-06-25 2007-07-05 株式会社空研 ねじ締め制御方法、および衝撃式動力ねじ締め工具
JP2005212022A (ja) * 2004-01-29 2005-08-11 Yokota Kogyo Kk 衝撃式締付工具

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Also Published As

Publication number Publication date
WO2014041723A1 (en) 2014-03-20
JP5877468B2 (ja) 2016-03-08
EP2895300A4 (de) 2016-06-08
EP2895300A1 (de) 2015-07-22
JP2014054702A (ja) 2014-03-27

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