WO2018028897A1

WO2018028897A1 - Method for calibrating and/or operating a hand-held power tool and hand-held power tool

Info

Publication number: WO2018028897A1
Application number: PCT/EP2017/066885
Authority: WO
Inventors: Chi Hoe Leong; Shu Wei GOH; Marco Stumm; Sebastian SCHWENDE; Chien Wern YIAP; Benjamin TAN KAI XI
Original assignee: Robert Bosch Gmbh
Priority date: 2016-08-09
Filing date: 2017-07-06
Publication date: 2018-02-15
Also published as: EP3497292B1; EP3497292A1; CN109563711A; DE102017209040A1; CN109563711B

Abstract

The invention relates to a method for calibrating and/or operating a hand-held power tool (10), which is provided for twisting at least one object (12) to be twisted. According to the invention, the method has at least one test step (14), in which a test object corresponding to the object (12) to be twisted is twisted at least until said test object is damaged by the twisting.

Description

description

Method for calibrating and / or operating a handheld power tool and handheld power tool

State of the art

From US 2009/0090428 Al a method for calibrating hand tool machines is already known, by which a damage of an object to be rotated is avoided.

DISCLOSURE OF THE INVENTION The invention is based on a method for calibration and / or for a calibration

Operation of a power tool, in particular a reinforcing binder, which is intended to rotate at least one object to be twisted. It is proposed that the method comprises at least one test step in which a test object corresponding to the object to be rotated is rotated at least until it is damaged by the twisting. As a result, an efficiency, in particular cost-efficiency, of the handheld power tool can advantageously be improved. In particular, the machine tool can be adapted to different objects to be rotated by the method for calibration and / or operation. Furthermore, costs can be saved since objects to be twisted can be used from different and particularly particularly cost-effective materials and / or smaller material thicknesses. An operational reliability can be increased particularly advantageously since, in particular, an uncontrolled malfunction, which too an uncontrolled damage to the object to be twisted, can be avoided.

A "hand tool machine" is to be understood in particular as meaning a portable machine tool which is intended to be guided at least partially, preferably at least to a large extent and particularly preferably completely by hand, and advantageously carried, at least in one operating state to a large extent "should be understood in particular at least 55%, advantageously at least 65%, preferably at least 75%, more preferably at least 85% and most preferably at least 95%. Preferably, the hand tool is designed as a portable machine tool. A "portable machine tool" is to be understood here in particular as meaning a machine tool for machining workpieces that can be transported by an operator so that it can not be transported, the portable machine tool in particular has a mass which is less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg, In particular, the hand tool machine can be designed as a drill, a hammer, a saw, a planer, a screwdriver, a milling cutter, a grinder, an angle grinder, a garden implement and / or a multifunctional tool If the hand tool is designed as a reinforcing binder, which is provided in particular for connecting reinforcements by means of the object to be twisted, in particular a wire, the term "intended" should be understood to mean specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

In particular, the handheld power tool comprises at least one drive unit, which is preferably provided to rotate at least the object to be rotated. A "drive unit" is to be understood in particular as meaning a unit which is intended to serve as a drive for at least one unit, preferably a plurality of further units The drive unit has at least one first drive direction and a second drive direction that is different from the first drive direction, wherein the drive unit is provided as a function of the drive direction to drive various further units of the handheld power tool. The drive unit preferably comprises at least one electric motor unit.

In particular, the hand tool machine has a twisting unit, which is driven in particular by the drive unit in the second drive direction and by means of which the drive unit rotates the object to be rotated. In addition, the handheld power tool in particular comprises a control unit, which is provided to control at least the drive unit in at least one operating state. The control unit is provided in particular in at least one calibration operating state and / or in a normal operating state of the handheld power tool for carrying out the method for calibration and / or for operation. A "control unit" is to be understood as meaning in particular a unit having at least one control electronics. "Control electronics" are to be understood as meaning, in particular, a unit having at least one processor unit and at least one memory unit and preferably an operating program stored in the memory unit at least by means of the processor unit is executable. Preferably, the operating program comprises the method for calibration.

A "method for calibration and / or operation" is to be understood in particular as a method that can be executed and advantageously automated at least by means of the control unit and that is intended to calibrate and / or operate the handheld power tool Calibration and / or operation is provided, in particular, for adapting the handheld power tool to at least one object to be rotated, and preferably to a plurality of differently configured objects to be rotated in particular The calibration and / or operation of the handheld power tool is dependent on at least one object parameter, which is preferably The object parameter is in particular a shape, preferably a thickness, a temperature, a type of material and / or a material property, such as, for example, the object to be twisted, which is changeable in particular during a service life and / or operation. example, an elastic deformability, a plastic deformability and / or in particular a modulus of elasticity. The method for calibration and / or operation, in particular the test step, can be carried out in particular if, in particular, a user initiates the method, in particular by actuation of an actuating element, in particular if a blank, which is used for

Production of the object to be rotated is exchanged, in particular when the power tool in an operating condition, preferably from a standby mode, merges and / or in particular when a malfunction occurs, such as in particular when the object to be twisted is damaged in a normal operating state.

A "test step" should be understood to mean, in particular, a method step which is different from a normal mode and which is especially intended for a test of the test object. In particular, the test object is manufactured prior to the execution of the test step. Under a

In particular, a "test object" is to be understood as a test object which has at least substantially equivalent object parameters to an object to be rotated and is preferably at least essentially equivalent to an object to be rotated on

Manufacturing and / or material tolerances are understood identical.

By "twisting an object to be twisted" is meant in this context, in particular, that the object to be twisted in particular at least partially around itself or with itself and / or preferably with another further object, in particular a reinforcement twisted It should be understood, in particular, that the object is at least plastically deformed and advantageously at least partially, in particular at least for the most part and particularly preferably completely broken and / or is torn. The twisting takes place in particular depending on at least one characteristic value. The characteristic value is in particular a value which is correlated with a torque, which acts on the object to be rotated during the rotation and is generated in particular by the drive unit. In particular, it is possible to conclude the torque on the basis of the characteristic value and / or determined by this. It is conceivable that the characteristic value is identical to the torque. Advantageously, however, the characteristic value corresponds to a torque-depicting characteristic value. In particular, the characteristic value corresponds to a, in particular direct, control and / or controlled variable of the drive unit. Advantageously, the characteristic value is one, in particular one

Sensor unit of the power tool, measurable signal. Advantageously, the characteristic is a current, a voltage and / or a rotational speed of the drive unit. In a normal operation of the power tool, the characteristic value is increased until this characteristic value reaches and / or exceeds a reference operating characteristic value.

In particular, the object to be rotated may be a tool element such as a drill, an abrasive blade, a saw blade, a tool blade and / or a tool bit. Preferably, the object to be rotated is a connection object, which is provided for a connection of at least two components, such as a screw. In a particularly preferred embodiment of the invention it is proposed that the object to be twisted is a wire for connecting reinforcements. As a result, reinforcements can be easily connected to each other by means of the wire.

It is further proposed that the method comprises at least one determination step in which at least one destruction parameter in which the test object is damaged by the rotation is determined. In a calibration operation, the characteristic value is increased, in particular, until the destruction index is reached and / or exceeded. As a result, an estimation of the force acting on the object to be twisted upon damage, in particular of the acting torque, can advantageously be carried out in a simple manner.

In a preferred embodiment of the invention, it is proposed that a torsion characteristic is detected to determine the destruction characteristic value. In this context, a "torsional characteristic" is to be understood as meaning, in particular, at least one curve and / or a table of values which is intended to assign at least two variables to one another For example, the torsion characteristic can be stored in the memory unit as a value table and / or as a mathematical function. Preferably, the torsion characteristic is a time profile of the characteristic value and preferably assigns a characteristic value to each time point. As a result, a temporal course of the characteristic value during operation of the handheld power tool can advantageously be determined.

Furthermore, it is proposed that at least one local maximum of the torsion characteristic is used as the destruction parameter. Furthermore, the torsional characteristic has a further local maximum, which differs from the local maximum, which corresponds to the destruction parameter. The further local maximum lies temporally before the local maximum, which corresponds to the destruction index. The local maximum is used in particular for determining the destruction characteristic value. The destruction parameter preferably lies temporally after at least one local minimum of the torsion characteristic. As a result, the destruction index can be determined with greater accuracy.

Furthermore, it is proposed that the test object is produced by cutting to length at at least one point in time, wherein the torsion characteristic has the local minimum after this point in time. Preferably, a

Recording of the local maximum started after the local minimum. In particular, the torsion characteristic at the time of cutting to length has the further local maximum. The object is preferably produced by the handheld power tool in at least one production step from a blank. As a blank for the object in particular a wire coil is provided, of which in particular a piece is cut to produce the wire. In particular, the handheld power tool comprises at least one feed unit which, in at least one feed step, supplies the blank at least partially for the production of the object. As a result, a determination of the destruction characteristic value can advantageously be simplified.

In order to avoid damage to the object to be rotated in a normal operating state, it is proposed that the method comprises at least one calibration step in which a torsion operating characteristic value which is used to rotate the object in a normal operating state of the manual Machine tool is provided, depending on the destruction characteristic value is generated. The torsional operating characteristic value is the reference operating characteristic reference value, in particular in a normal operating state. In particular, when and / or after reaching the torsional operating characteristic value in the normal operating state, the characteristic value of the drive unit is not further increased, and preferably a rotation is ended. In particular, the torsional operating characteristic value is smaller, in particular smaller in magnitude, than the destruction characteristic value. Particularly preferably, the destruction characteristic value is weighted by means of a function in order to generate the torsion operating characteristic value. In particular, the function may be a polynomial function of the nth order, where n represents any natural number. Preferably, the function is a constant factor, which is in particular less than one, which preferably corresponds to a polynominal function of zeroth order. In particular, the destructive characteristic for weighting and generating the torsional operating characteristic is multiplied by the function. As a result, the destruction index at a

Normal operation are taken into account in order to avoid damage to the object to be rotated.

In order to avoid a particularly erroneous calibration, it is proposed that, in the event that the torsional operating characteristic value is smaller than a nominal characteristic value stored for rotating the object in a normal operation of the handheld power tool, in particular in the memory unit, an alternative torsional operating characteristic value is generated at least greater than the nominal characteristic value. Additionally or alternatively, it is proposed that in the event that the torsional operating characteristic value is smaller than the stored nominal characteristic value, at least the test step and preferably the method for the calibration step calibration is at least partially repeated.

It is proposed that the destruction index value is a current and / or a rotational speed of the drive unit of the handheld power tool. This allows the

Destruction characteristic are assigned in a simple way a control and / or regulation characteristic.

Furthermore, it is proposed that at least one torsional operating characteristic value generated in a calibration step, which is used to rotate the object is provided in a normal operating state of the power tool, is monitored in the normal operating state, in particular constantly, and is changed depending on a falling below or exceeding of a limit in the normal operating state. It may be advantageous to respond to changing conditions during a normal operating state, in order to ensure an immediately reliable wrapping of reinforcements by means of a trained as a wire object.

It is also proposed that at least one load characteristic value is taken into account for generating and / or changing a torsion operating characteristic value which is provided for rotating the object in a normal operating state of the handheld power tool. Preferably, the load characteristic value is designed as a characteristic variable counteracting a rotation and / or twisting of the object, in particular a force and / or a torque, a correlated voltage characteristic and / or a current characteristic. At least one twisting parameter is preferably taken into account for producing and / or changing the torsional operating characteristic value. The twisting parameter is preferably a number of twists and / or twists of the object, in particular around itself. Alternatively or additionally, it is conceivable that a number of wound loops of the object is monitored, in particular by a quantifiable statement with respect to a failure of the object, in particular of the wire. By means of the embodiment according to the invention, it is advantageously possible to take into account a load condition of the object for generating and / or modifying a torsional operating characteristic value. It may be advantageous, during a generation and / or a change in a torsion operating characteristic, to take into account an arrangement of the object to be rotated on a workpiece, in particular on a reinforcement. Reliable limit values can advantageously be determined in order to ensure safe wrapping of reinforcements by means of an object designed as a wire.

In a further aspect of the invention, a handheld power tool is proposed with at least one drive unit, which is intended to rotate at least one object, and with at least one control unit, which is provided for at least the operating mode in at least one operating state Drive unit to be driven, and which in at least one Kalibrierungsbe- operating state for performing a method for calibration, in particular the method described above, is provided, wherein the control unit is provided in the calibration mode to a test object corresponding to the object by means of the drive unit at least as far to twist until this is damaged by twisting. As a result, an efficiency, in particular cost-efficiency, of the handheld power tool can advantageously be improved. By the fact that "an object is damaged" should be understood in particular that the object is at least plastically deformed and advantageously at least partially, in particular at least to a large extent and particularly preferably completely broken and / or cracked.

The hand tool according to the invention and / or the method according to the invention should not be limited to the application and embodiment described above. In particular, the invention can / can

Hand tool and / or the method according to the invention to fulfill a function described herein have a number of individual process steps, elements, components and units differing from a number mentioned herein.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Show it:

1 shows a hand-held power tool with a drive unit and a control unit in a schematic side view, FIG. 2 shows a schematic flow chart of an operation of the hand-held power tool, which includes a method for calibration, a schematic representation of an exemplary torsion characteristic.

Description of the embodiment

Fig. 1 shows a schematic representation of a hand tool 10 in a side view. The hand tool 10 is provided for rotating an object to be rotated. In the present case, the hand tool 10 is designed as a reinforcing binder. Alternatively or additionally, the handheld power tool 10 could be designed as a drill, a drill and / or percussion hammer, a saw, a planer, a screwdriver, a milling cutter, a grinder, an angle grinder, a garden implement and / or a multifunctional tool.

The hand tool 10 has at least one control unit 38. The control unit 38 comprises at least one control electronics. The control electronics has at least one processor unit. The processor unit is provided at least for executing an operating program. Furthermore, the control electronics has a memory unit. An operating program is stored in the memory unit.

The hand tool 10 has a drive unit 36. The control unit 38 is provided to actuate at least the drive unit 36 in at least one operating state. The drive unit 36 is operated depending on at least one characteristic value. The drive unit 36 has a first drive direction. Furthermore, the drive unit 36 has a second drive direction. The second drive direction is different from the first drive direction. In the present case, the first drive direction corresponds to a drive in the clockwise direction. The second drive direction corresponds to a drive in the counterclockwise direction. The drive unit 36 is provided at least for driving at least one further unit of the handheld power tool 10. The drive unit 36 is operated depending on a characteristic value. The characteristic value is a current, a voltage and / or a rotational speed. The hand tool 10 has a feed unit 42. The feed unit 42 is driven by the drive unit 36. The drive unit 36 is provided to drive at least the feed unit 42 in the first drive direction. The feed unit 42 is provided for feeding a blank. The blank is provided for producing the object 12 to be rotated. Of the

Blank is a wire spool. The hand tool 10 produces the object 12 to be rotated from the blank.

The hand tool 10 has a molding unit 44. The feed unit 42 leads the molding unit 44 at least partially to the blank. The mold unit

44 has a beak-shaped extension. The forming unit 44 deforms, in particular by means of the extension, the supplied part of the blank. The forming unit 44 forms the supplied part of the blank at least to a loop. Depending on the requirement and in particular the length of the supplied part of the blank, the forming unit 44 forms a different number of loops. The object 12 to be twisted is a wire for connecting reinforcements.

The hand tool 10 has a cutting unit 46. The cutting unit 46 is driven by the drive unit 36, in particular in the second drive direction. The cutting unit 46 is intended to cut off the supplied part of the blank. The cutting unit 46 produces the object 12 to be twisted from the supplied part of the blank. In particular, the cutting unit 46 elongates the supplied part of the blank during a twisting of the supplied part of the blank.

The hand tool 10 has a twisting unit 40. The twisting unit 40 is driven by the drive unit 36, in particular in the second drive direction. By means of the twisting unit 40, the drive unit 36 twists the object 12 to be rotated.

FIG. 2 shows a schematic flowchart of an operation of the handheld power tool 10, which includes a method for calibrating and / or operating the handheld power tool 10. The method includes a turn-on step 50. Before the turn-on step 50, the control unit 38 is turned off. At the turn-on step 50, the control unit 38 is turned on. The method includes an initialization step 52. In the initialization step 52, the control unit 38 enters a standby mode.

The method comprises an activation step 54. In the activation step 54, the control unit 38 is transferred from the standby mode to an operating state. In the present case, the control unit 38 is converted by a user into the operating state. The user transfers the control unit 38 into the operating state by actuating an actuating element of the handheld power tool 10. If the actuating element is not pressed, the handheld power tool 10 remains in the standby mode.

The method comprises a first interrogation step 56. In the first interrogation step 56, a query is made as to whether a calibration is to be carried out. To operate the power tool 10, a reference operating characteristic value is predetermined by the control unit 38, with which the drive unit 36 is operated. If a calibration is not initiated, the reference operating characteristic value is a torsional operating characteristic value 30. The reference operating characteristic value of the drive unit 36 can be increased in operation up to the torsional operating characteristic value 30 without the object 12 to be rotated being damaged. The torsional operating characteristic value 30 may have been determined, for example, in a previous embodiment of the method for calibration and / or for operation. A calibration should be done when a user initiates this, for example by actuating an actuator. Alternatively or additionally, it is conceivable that a calibration takes place when a blank, which is provided for producing the object 12 to be rotated, is exchanged when the control unit 36 changes to the operating state, in particular from the standby mode, and / or a malfunction occurs, such as when the object 12 to be rotated is damaged, particularly in a normal operating state. The method includes a setting step 58. The setting step 58 is executed when a calibration is initiated. If a calibration has not been initiated, the reference operating characteristic value is replaced by a maximum characteristic value. The maximum characteristic value corresponds to a maximum characteristic value up to which the drive unit 36 can be operated.

The method includes a feed step 60. In the feed step 60, the blank is fed. For this purpose, the feed unit 42, in particular in the first drive direction, is driven by the drive unit 36. The feed unit 42 feeds the blank to the forming unit 44. The forming unit 44 deforms the supplied part of the blank at least to a loop.

The method includes a second interrogation step 62. In the second interrogation step 62, a number of the loops of the blank are determined. If the number of loops is smaller than a requested number, the feeding step 60 is continued. The feeding step 60 is terminated when the number of loops is greater than or equal to the requested number.

The method includes a twisting step 64. The twisting step 64 is performed when the feeding step 60 is completed. In the twisting step 64, the supplied part of the blank is twisted. For this purpose, the drive unit 36 drives the twisting unit 40, in particular in the second drive direction. The supplied part of the blank is rotated by means of the drive unit 36.

The method comprises a third interrogation step 66. The third interrogation step 66 queries whether a number of rotations of the supplied part of the blank and / or a time intended for the rotations exceeds a reference value. For a case that this is below, the twisting step 64 is continued. If the reference value is exceeded, the twisting step 64 is ended.

The method includes a test step 14. The test step 14 is performed when the twisting step 64 is completed. The test step 14 comprises a first partial step. In the first sub-step, the supplied part of the blank is further rotated. Preferably, at least one load characteristic is added to a generator. tion and / or to a change in the torsional operating characteristic value 30, which is provided for rotating the object 12 in a normal operating state of the power tool 10, is taken into account. The drive unit 36 drives the cutting unit 46, in particular in the second drive direction. The cutting unit 46 cuts off the supplied part of the blank and produces the object 12 to be rotated and / or a test object corresponding to the object 12 to be rotated. In the present case, the object 12 to be rotated is a test object. In a further partial step, the test object is twisted until it is damaged. For this purpose, a characteristic value with which the drive unit 36 is operated is increased until the test object is damaged and / or until the reference operating characteristic value has been reached. In the present case, the characteristic value is a current with which the drive unit 36 is operated. Alternatively or additionally, the characteristic value may be a rotational speed with which the drive unit 36 is operated.

The method comprises a fourth interrogation step 68. In the fourth interrogation step 68, it is determined whether the reference operating characteristic value has been reached. If the reference operating characteristic value has not yet been reached, the test step 14 is continued. If the reference operating characteristic value is reached, the test step 14 is ended. Alternatively or additionally, damage to the test object can be investigated. If the test object is damaged, the test step can be ended. If the test object is not damaged, the test step 14 is continued.

The method includes a stop step 70. The stop step 70 is performed when the test step 14 is completed. In the stop step 70, the drive unit 36 is stopped.

The method includes a fourth interrogation step 72. In the fourth interrogation step 72 it is queried whether a calibration has been initiated. If no calibration is initiated, the activation step 54 is performed again. If a calibration is initiated, a determination step 18 of the method is performed.

The method comprises a determination step 18. In the determination step 18, a destruction characteristic value 20 is determined. The destruction index 20 is the characteristic value at which the test object is damaged by the twisting. is being damaged. In order to determine the destruction characteristic value 20, a torsion characteristic 22 is detected in the preceding method steps, in particular in the test step 14. An exemplary torsion characteristic 22 is shown in a diagram 82 in FIG. 3. The diagram 82 has an abscissa axis 78. A time in seconds is plotted on the abscissa axis 78. The diagram 82 has an ordinate axis 80. The characteristic value is plotted on the ordinate axis 80. In the present case, the characteristic value is a current with which the drive unit 36 is operated. Alternatively or additionally, the characteristic value may be a rotational speed of the drive unit 36. The torsion characteristic 22 has a local maximum 24. The destruction index 20 is a local one

Maximum 24 of the torsion curve 22. The torsion curve 22 has a local minimum 26. The destruction index 20 lies temporally after the local minimum 26. The torsion characteristic curve 22 has the local minimum 26 after the point in time at which the test object is produced by cutting to length. Furthermore, the torsion characteristic 22 has a further local maximum 27. The second local maximum 27 lies ahead of the local minimum 26. The destruction parameter 20 is determined by detecting the characteristic value after passing through the local minimum 26 until the local maximum 26 is reached. Alternatively or additionally, the destruction index 20 can be detected by combining a plurality of torsional characteristics. For example, a first torsional characteristic map a temporal current profile of the drive unit 36. A second torsional characteristic can map a time profile of the rotational speed of the drive unit 36. The second torsional characteristic has a local minimum. The local minimum is before the time when the first torsional characteristic has the local maximum.

The method includes a calibration step 28. At calibration step 28, a torsional operation characteristic 30 is generated. The torsional operating characteristic value 30 is provided for rotating the object 12 to be rotated in a normal operating state of the handheld power tool 10. The torsional operation characteristic value 30 is generated depending on the destruction characteristic value 20. To generate the torsional operating characteristic value 30, the destruction parameter 20 is weighted by means of a function. The function is a factor in the present case. The factor is less than one. The destruction index 20 is multiplied by the function to produce the torsional operation characteristic 30. The method comprises a fifth query step 74. A nominal characteristic value is stored in the memory unit. In the event that the generated torsion operation characteristic value 30 is greater than the nominal characteristic value, the control unit 38 enters the standby mode, in particular the initialization step 52.

The method includes an override step 76. If the generated torsion operation characteristic 30 is less than the nominal characteristic, an alternative torsional operation characteristic is generated. The alternative torsional operating characteristic is at least greater than the nominal characteristic value. Alternatively or additionally, if the determined torsional operating characteristic value 30 is smaller than the stored nominal characteristic value, at least the test step 14 can be repeated.

In a possible sequence of the method, the control unit 38 is turned on in the switching-on step 50. In the initialization step 52, the control unit goes

38 into a standby mode. As a result of an actuation of the actuating element by a user, the control unit 38 is transferred in the activation step 54 from the standby mode to an operating state. It is checked whether the power tool 10 is in a calibration mode under load or no load. If the hand tool 10 in the

Calibration operation state, at least the torsional operation characteristic 30 is determined by means of the test step 14 and / or by means of an alternative method sequence. In the test step 14 and / or in the alternative method sequence, the object 12, in particular formed as a wire, is fed to the forming unit 44 by means of the feed unit 42 in the feed step 60. It is preferably a

Number of wound loops of the object 12 monitors, in particular during a feed of the object 12 to the forming unit 44. Should a number of wound loops of the object 12 be smaller than a predetermined number, the feeding of the object 12 to the forming unit 44 continues to occur - To get re wound loops of the object 12. If a number of wound loops of the object 12 are greater than or equal to a predetermined number, a feed is stopped and the object 12 is rotated by means of the twisting unit 40. During rotation of the object 12 by means of the twisting unit 40, preferably a speed is achieved and / or a current of the drive unit 36 is monitored. Upon detection of a repeated Speed reduction of the drive unit 36, such as five speed drops in sequence o. The like., A detected during the speed falls maximum current characteristic of the drive unit 36 and a detected up to the speed drops number of twists of the object 12 in the storage unit. It is conceivable that the test step 14 may be omitted or alternatively carried out after a detection of repeated speed reductions. The maximum current value stored in the memory unit is stored in the memory unit as the upper limit for a current of the drive unit 36, wherein the limit value can be used as a reference for detecting and / or preventing damage to the object 12 during a normal operating state. In particular, the upper limit value for a current of the drive unit 36 forms the destruction index value 20. The number of twists stored in the storage unit is stored as the upper limit for a number of twists in the storage unit, the limit value being used as a reference for recognition and / or recognition

Avoidance of damage to the object 12 can be used during a normal operating state. Preferably, the upper limit value for a current of the drive unit 36 and the upper limit value for a number of twists during a rotation of the object 12 are monitored to a connection of workpieces, in particular reinforcements.

In the calibration operating state, at least one load characteristic value of the handheld power tool 10 is detected, which enables a statement as to whether the handheld power tool 10 is arranged on a workpiece, in particular on a reinforcement, or not. It can advantageously be detected whether the industrial machine 10 is operated under load or without load. For example, it is conceivable for the handheld power tool 10 to have a distance sensor, a contact sensor or another sensor that appears appropriate to a person skilled in the art, by means of which an arrangement of the handheld power tool 10 can be detected on a workpiece. Upon detection of an arrangement of

Hand tool 10 on a workpiece, in particular on a reinforcement, and performing a rotation of the object 12 on the workpiece is preferably a comparison of the stored in the storage unit upper limits with newly acquired values. In the event of a deviation of the newly acquired values from the upper limit values stored in the storage unit via a In addition to the tolerance range, a new definition of the upper limit values is preferably carried out in the memory unit, in particular analogously to the method sequence already described above, for example by monitoring a rotational speed and / or current of the drive unit 36 and subsequent evaluation and storage in the memory unit. It is conceivable that only one of the upper limit values is changed or that both upper limit values are changed.

In a normal operating state under load or without load, at least one torsional operating characteristic value 30 generated in a calibration step 28, which is provided for rotating the object 12 in the normal operating state of the handheld power tool 10, is monitored in the normal operating state and depending on a falling below or exceeding one, in particular stored in the memory unit upper, limit changed in the normal operating state. In the normal operating state, at least one load characteristic value of the handheld power tool 10 is detected, which enables a statement as to whether the handheld power tool 10 is arranged on a workpiece, in particular on a reinforcement, or not. It can be advantageously detected whether the manual traction machine 10 is operated under load or without load. Preferably, automatically between the operating states

Normal operating state and calibration operating state of the control unit 38 as a function of a first commissioning of a change in a workpiece parameter, such as a change in diameter, a workpiece material change o. The like., From environmental influences, from a power supply characteristic of the power tool 10 o. The like.

Upon detection of an arrangement of the handheld power tool 10 on a workpiece, in particular on a reinforcement, and a performance of a rotation of the object 12 on the workpiece in a normal operating state, a comparison of the upper stored in the memory unit preferably takes place

Limits with newly acquired values. In the event of a deviation of the newly acquired values from the upper limit values stored in the memory unit beyond a tolerance range, a new definition of the upper limit values in the memory unit is preferably carried out, in particular analogously to the method sequence already described above, such as, for example, Chung a speed and / or current of the drive unit 36 and an adjoining evaluation and deposit in the storage unit. It is conceivable that only one of the upper limit values is changed or that both upper limit values are changed.

When detecting a damage of the object 12, in particular a breakage of the object 12 as a result of a rotation, the alternative torsional operating characteristic value can preferably be generated in the normal operating state. The alternative torsional operating characteristic value is preferably smaller than the torsional operating characteristic value 30, in particular in order to enable a reduction of an upper limit value stored in the storage unit, which can avoid damage to the object 12 as a result of a rotation of the object 12. Preferably, the alternative torsional operating characteristic value can be generated by multiplying the destruction index value 20 generated in the determination step 18 by an alternative factor that is less than one and greater than the factor with which the destruction index value 20 can be multiplied to generate the torsion operating characteristic value 30.

Upon detection of a loose contact of the object 12 wound around the workpiece, in particular as a result of a rotation of the object 12 with too small a number of twists or with insufficient power of the drive unit 36, an additional torsional operating characteristic value can preferably be generated in the normal operating state. The additional torsional operating characteristic value is preferably greater than the torsional operating characteristic value 30, in particular in order to enable an increase in an upper limit value stored in the storage unit, which enables a secure and firm abutment of the object 12 on the workpiece as a result of a rotation of the object 12. Preferably, the additional torsional operating characteristic value can be generated by multiplying the destructive characteristic value 20 generated in the determining step 18 by an additional factor that is greater than one. It can be advantageously realized an individual change of characteristics to an operation of the power tool 10 during operation.

Claims

claims

1. A method for calibrating and / or operating a hand tool (10), in particular a reinforcing binder, which is intended to rotate at least one object to be rotated (12), characterized by at least one test step (14), in which a to twisting object (12) corresponding test object is at least as far rotated until it is damaged by the twisting.

2. The method according to claim 1, characterized in that the object to be rotated (12) is a wire for connecting reinforcements.

3. The method according to claim 1 or 2, characterized by at least one determining step (18) in which at least one destruction characteristic value (20), in which the test object is damaged by the twisting, is determined.

4. The method according to claim 3, characterized in that for determining the destruction characteristic value (20) a torsion characteristic (22) is detected.

5. The method according to claim 4, characterized in that at least one local maximum (24) of the torsion characteristic (22) is used as the destruction characteristic value (20).

6. The method according to claim 4 or 5, characterized in that as

Destruction index (20) a value is used, which is temporally after at least one local minimum (26) of the torsional characteristic (22). A method according to claim 6, characterized in that the test object is produced at least one time by cutting to length, wherein the Torsionskennlinie (22) has the local minimum (26) temporally after this time.

Method according to at least one of Claims 3 to 7, characterized by at least one calibration step (28) in which a torsion operating characteristic value (30) which is provided for rotating the object (12) in a normal operating state of the handheld power tool (10) depends on the destruction characteristic value (20) is generated.

Method according to Claim 8, characterized in that the destruction characteristic value (20) is weighted by means of a function in order to generate the torsion operating characteristic value (30).

A method according to claim 8 or 9, characterized in that, in the event that the Torsionsbetriebskennwert (30) is smaller than a stored Nominalkennwert, for rotating the object (12) in a normal operating state of the power tool (10) generates an alternative Torsionsbetriebskennwert which is at least greater than the nominal characteristic value.

A method according to claim 8 or 9, characterized in that, in the event that the Torsionsbetriebskennwert (30) is smaller than a stored Nominalkennwert, at least the test step (14) is repeated.

Method according to one of claims 3 to 11, characterized in that the destruction characteristic value (20) is a current and / or a rotational speed of a drive unit (36) of the handheld power tool (10). Method according to one of the preceding claims, characterized in that at least one torsional operating characteristic value (30) generated in a calibration step (28), which is provided for rotating the object (12) in a normal operating state of the handheld power tool (10), is monitored in the normal operating state and in Depending on a falling below or exceeding of a limit in the normal operating state is changed.

Method according to one of the preceding claims, characterized in that at least one load characteristic is taken into account for generating and / or modifying a torsional operating characteristic value (30) which is provided for rotating the object (12) in a normal operating state of the handheld power tool (10) ,

Hand tool (10), in particular reinforcing binder, with at least one drive unit (36) which is intended to rotate at least one object to be rotated (12), and with at least one control unit (38), which is provided in at least one operating state at least controlling the drive unit (36) and which is provided in at least one calibration operating state for carrying out a method for calibration, in particular a method according to one of the preceding claims, characterized in that the control unit (38) is provided in the calibration operating state the object (12) corresponding test object by means of the drive unit (36) to rotate at least until it is damaged by the rotation.