EP3419789A1 - Outil électrique - Google Patents
Outil électriqueInfo
- Publication number
- EP3419789A1 EP3419789A1 EP17704723.0A EP17704723A EP3419789A1 EP 3419789 A1 EP3419789 A1 EP 3419789A1 EP 17704723 A EP17704723 A EP 17704723A EP 3419789 A1 EP3419789 A1 EP 3419789A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output shaft
- angle
- torque
- monitoring
- surrounding area
- 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- Withdrawn
Links
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
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- 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
-
- 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
Definitions
- the invention relates to a method of performing a tightening operation by means of a handheld power wrench with a first and a second angular measuring device.
- the invention also relates to a power tool adapted to perform said method.
- Modern professional power wrenches are provided with a number of sensors and means for detecting and reporting parameters of on-going and performed tightening operations .
- Parameters that may be detected and reported include the applied torque, the installed angular increment of a bolt, screw or nut of a joint and in some instances the clamp force installed into the joint.
- WO 2015/139952 Al discloses a method of obtaining a high clamp force accuracy in a threaded joint mounting process.
- a gyro or the like is used to monitor the clamp force installed into a joint.
- the gyro is used to monitor the angle of the tool, which is recalculated to a clamp force.
- the clamp force is a parameter that is relevant in many tightening operations, but in some operations other parameters may however be more interesting and more easily monitored.
- a method that provides an improved accuracy for tightening operations, but which offers an alternative to a method in which the operation is governed based on the clamp force installed into a joint.
- An object of the invention is to provide a method of performing an operation of tightening a joint with an increased accuracy.
- an object of the invention is to provide an accurate monitoring of the installed angle of a handheld torque delivering power tool without the use of torque arms or other means for
- this object is achieved by means of a method of tightening a joint by means of a handheld torque delivering power tool, the power tool comprising:
- a first angular measuring device for monitoring the angle of rotation of the output shaft about the axis of the output shaft with respect to the housing
- a second angular measuring device arranged to monitor angle of rotation of the housing around the axis of the output shaft relative to the surrounding area
- the invention relates to a handheld torque delivering power tool comprising:
- a first angular measuring device for monitoring the angle of rotation of the output shaft about the axis of the output shaft with respect to the housing
- a second angular measuring device arranged to monitor angle of rotation of the housing around the axis of the output shaft relative to the surrounding area
- control unit wherein the control unit is arranged to perform the following steps:
- a yield tightening is performed, which indicates that a plastic deformation of the fastener in the joint is achieved.
- the step of interrupting the tightening operation is preceded by a step of identifying the appearance of a substantially linear torque per angle coefficient and registering a linear gradient that corresponds to the substantially linear torque per angle of rotation, wherein the predetermined stop gradient is set in relation to said linear gradient.
- This step is in the power tool achieved by the control unit.
- the tightening operation is interrupted at a point where the instantaneous differential coefficient of the monitored torque per monitored angle of the output shaft relative to the surrounding area has reached below 90% of the linear gradient, or 75% of the linear gradient. This step may also be achieved by the control unit.
- Fig. 1 is a diagram of the dependency of the torque T with respect to an angle a of an output shaft during a tightening operation
- Fig. 2 shows a power tool in an initial position
- Fig. 3 shows a power tool in an position where both the tool housing and output shaft have rotated with respect to the axis of the output shaft
- Fig. 4 shows the steps of the inventive method. Detailed description of the shown embodiment of the invention
- Fig. 1 shows a diagram of the dependency of the torque T that is installed into a joint with respect to an angle a by which a fastener of the joint is rotated.
- the curve represents a typical curve of a tightening operation in which the joint is tightened into the yield area, i.e. such that a plastic deformation of the fastener is achieved.
- the torque is constant during a first period in which the fastener is rotated towards the joint, i.e.
- the tightening operation may be set to be interrupted when the differential coefficient reaches a predetermined stop
- the predetermined stop gradient k st o P at which the tightening should be interrupted may be set in relation to a specific fraction of the linear gradient ki in the linear portion, i.e.
- the gradient must however be a compromise between the need to interrupt the tightening before the fastener risks to rupture and the need to be sure that the plastic deformation has actually started .
- the predetermined stop gradient k s to P at which the tightening should be interrupted differs too little from the linear gradient ki of the linear portion the tightening operation may be interrupted prematurely due to a natural variation or a tolerance fault. If, on the other hand, the predetermined stop gradient k s to P is set too high the risk of rupture of the fastener will increase.
- the predetermined stop gradient k stop may be tested by a skilled person, and may
- the tightening operation may e.g. be set to be interrupted when the instantaneous differential coefficient dT/da has reached below 75% or 90% of the linear gradient ki .
- the angle at which the tightening operation is interrupted may be defined as a s to P and the corresponding torque at which the tightening operation is interrupted may be defined as T s to P , even though the operation is not controlled towards a specific angle nor a specific torque but to the
- Another feature concerned with a yield tightening is to prepare for the interruption in advance such that the targeted the predetermined stop gradient k st o P is met.
- special care has to be taken to the movement of the tool .
- Figures 2 and 3 show a power tool in two different positions.
- the power tool is illustrated in an initial position and in figure 3 the power tool is shown in an off-set position in which the output shaft has rotated about the axis of the output shaft with respect to the housing with an angle a , and in which the housing has rotated around the axis of the output shaft relative to the
- the combined angle a is hence the sum of a and (3 ⁇ 4 and corresponds to the rotation of a fastener with respect to a joint, the joint being fixed with respect to the surrounding area.
- 105 Calculating a differential coefficient of the monitored torque per monitored angle; 106 -Identifying an installed clamp force, e.g. by identifying the appearance of a substantially linear torque per angle coefficient;
- Step 106 may be omitted and in such a case step 107 will be defined in an absolute number, i.e. as a specific predetermined decrease of the torque per angle coefficient and not in relation to the substantially linear torque per angle coefficient.
- the power tool 10 is provided with an output shaft 11, which is to be connected to and drive the rotation of a fastener, and a handle 12 at which the power tool is to be held by an operator.
- the power tool may also be provided with a second handle for positioning of the operator's other hand.
- a motor 13 and preferably a gear (not shown) is arranged to drive the output shaft .
- a housing 14 is arranged to house the motor 13, gears and other features, such as a first angular measuring device 15, a second angular measuring 16 device torque monitoring device 17 and a control unit 18.
- the first angular measuring device 15 is arranged to monitor the angle of rotation a of the output shaft 11 about the axis of the output shaft with respect to the housing 14.
- the second angular measuring device 16 is arranged to monitor the angle of rotation (3 ⁇ 4 of the housing 14 around the axis of the output shaft 11 relative to the surrounding area.
- the torque monitoring device 17 is arranged to monitor the torque T during a tightening operation .
- a control unit 18 is arranged in the power tool to control the operation of the tool based on the monitored torque T and angles of rotation a and
- control unit 18 an instantaneous differential coefficient dT/da of the monitored torque T per monitored angle a of the output shaft 11 relative to the surrounding area is calculated.
- the control unit 18 is arranged to instruct the motor 13 to interrupt the tightening
- the decrease may be defined in absolute numbers or as fraction of the differential coefficient ki in the linear portion of the curve shown in figure 1.
- angles a n defined in the diagram are all the sum of the angles a a and ab provided by the first and second angular measuring device 15 and 16, respectively.
- ai corresponds to the sum of the individually monitored angles a a -i and oib-i ⁇
- a 2 a a -2 + a b -2
- a s to P a a - s to P + a b -sto P .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1650255 | 2016-02-26 | ||
PCT/EP2017/052849 WO2017144281A1 (fr) | 2016-02-26 | 2017-02-09 | Outil électrique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3419789A1 true EP3419789A1 (fr) | 2019-01-02 |
Family
ID=58018089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17704723.0A Withdrawn EP3419789A1 (fr) | 2016-02-26 | 2017-02-09 | Outil électrique |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3419789A1 (fr) |
WO (1) | WO2017144281A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4008772A (en) * | 1975-05-19 | 1977-02-22 | Standard Pressed Steel Co. | Tightening system |
US4211120A (en) * | 1978-08-08 | 1980-07-08 | Sps Technologies, Inc. | Tightening apparatus |
DE3247618A1 (de) * | 1982-12-23 | 1984-07-05 | Deutsche Gardner-Denver Gmbh, 7081 Westhausen | Verfahren zum anziehen von schraubverbindungen |
DE3634895A1 (de) * | 1986-10-14 | 1988-04-21 | Egm Entwicklung Montage | Verfahren und vorrichtung zum anziehen einer schraubverbindung |
GB2273574B (en) * | 1992-12-21 | 1995-11-29 | Daimler Benz Ag | Process and a device for the rotation-angle-monitored tightening or loosening of screw connections |
-
2017
- 2017-02-09 WO PCT/EP2017/052849 patent/WO2017144281A1/fr active Application Filing
- 2017-02-09 EP EP17704723.0A patent/EP3419789A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2017144281A1 (fr) | 2017-08-31 |
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