Machine tool device for controlling and / or regulating at least one machine tool function of a machine tool

Description

State of the art

[0001] From US 2013 / 0187587 A1, a machine tool device for controlling and / or regulating at least one machine tool function of a portable machine tool is already known, comprising a detection unit with at least one sensor unit for detecting parameters of the portable machine tool, in particular parameters of a motor operation of the portable machine tool.

[0002] US 2014 / 166323 A1 discloses a set of parameters for the safe operation of a powered hand-held power tool equipped with sensors, in particular an acceleration sensor, wherein a computing circuit of the hand-held power tool determines whether the acceleration of the tool is within the safe operating parameters.

[0003] DE10 2014 209032 A1 forms the basis for the generic terms of the independent claims. Disclosure of the invention

[0004] The invention is based on a machine tool device for controlling and / or regulating at least one machine tool function of a machine tool, in particular a portable machine tool, with at least one detection unit for detecting at least one characteristic variable of the machine tool and / or of a machining tool arranged on the machine tool.

[0005] According to the invention, the machine tool device comprises at least one braking unit, wherein at least one braking function of the braking unit can be adapted at least partially automatically, namely dynamically, depending on the at least one detected characteristic variable.

[0006] A "machine tool" is understood here, in particular, to mean a machine for machining workpieces. The machine tool can be battery-operated or corded. In particular, the portable machine tool is designed as an oscillating machine tool with an oscillating tool arranged and / or capable of being arranged on the oscillating machine tool, wherein the oscillating tool can be driven at an oscillation frequency, preferably in the kHz range. The machine tool is particularly preferably designed as an angle grinder. The machine tool can be designed as a battery-operated angle grinder or as a corded angle grinder.However, it is conceivable that the machine tool may have a different configuration that would be deemed appropriate by a person skilled in the art, such as a chainsaw, a gardening tool, an electric planer, a drill, a grinder, a hammer drill and / or chisel hammer, or a multifunctional machine. A "portable machine tool" is understood, in particular, to mean a machine tool that can be transported by an operator without the need for a transport device. The portable machine tool, in particular, has a mass of less than 40 kg, preferably less than 10 kg, and particularly preferably less than 5 kg.

[0007] A "machining tool" is to be understood here in particular as a tool that is arranged and / or can be arranged directly or indirectly on the machine tool and that, in at least one operating state, is at least partially in direct contact with at least one workpiece and machines the workpiece.

[0008] "Dynamic" here means continuously active over time or actively or passively variable within a time period or for the duration of a process. Dynamically adaptable braking means that the braking function's effect has a non-static, temporally variable, and / or temporally limited for the duration of a process and / or adapted to a value of a parameter, continuously controlled and / or regulated course. In particular, the braking function is dynamically adaptable within a time range in which a movement state of the machining tool changes. This is intended, in particular, to prevent abrupt, non-variable braking with a constant applied braking torque. "Provided" is understood, in particular, to mean specially programmed, specially designed, and / or specially equipped.

[0009] The fact that a device and / or a unit is intended for a specific function should be understood in particular to mean that the device and / or the unit fulfils and / or executes this specific function in at least one application and / or operating state.

[0010] A "characteristic variable" is understood, in particular, to be an operating parameter that is preferably correlated with a physical and / or chemical state of a machine tool and / or a machining tool arranged on the machine tool and / or with a physical and / or chemical property of an environment. In particular, the characteristic variable can be correlated with a spatial location, in particular a position and / or orientation, in particular with respect to a reference point, with a state of motion and / or acceleration, a temperature, a magnetic field, an electric field, electromagnetic radiation, a speed and / or torque of a motor of the machine tool, a speed and / or torque of a part of the machine tool and / or a machining tool arranged on the machine tool, and / or with another property that appears appropriate to a person skilled in the art.

[0011] A "detection unit" is to be understood in particular as a unit which is intended to detect at least one characteristic variable, whereby detection can be carried out actively, such as in particular by generating and transmitting an electrical measurement signal, and / or passively, such as in particular by detecting changes in the properties of the detection unit.

[0012] In particular, the detection unit can have one or more detection elements. The detection element is particularly intended to detect at least one specific parameter, wherein detection can be carried out actively, such as in particular by generating and transmitting an electrical measurement signal, and / or passively, such as in particular by detecting changes in the properties of the detection element. The detection element preferably has at least one sensor. In particular, the sensor can be designed as a mechanical, capacitive, resistive, magnetic, in particular geomagnetic, electrical, electromagnetic, acoustic and / or optical sensor. The sensor can be designed in particular as a power sensor, optical sensor, gyroscope, motion sensor, acceleration sensor, speed sensor, pressure sensor, temperature sensor, infrared sensor and / or orientation sensor.

[0013] The detection unit can in particular be provided for a user- and / or machine-initiated and / or advantageously for an automatic and / or automated detection of the signal provided by the detection unit and / or at least one detection element, for example continuously, at preferably regular time intervals and / or as a function of at least one defined triggering event. Preferably, the braking unit is provided for carrying out a braking process, wherein the machining tool can be braked relative to a machine tool housing. The braking process takes place as a function of the detected characteristic variable. At least one braking function of the braking unit can be automatically, dynamically, adapted by means of a control and / or regulating unit.In particular, the machining tool can be braked to an almost complete standstill, with the kinetic energy of the machining tool being at least substantially completely converted into another form of energy. It is conceivable that the machining tool can be braked briefly, partially, dynamically, by braking pulses. This allows for a particularly advantageous braking process. A "control and / or regulating unit" is understood in particular to mean a unit with at least one control electronics unit. "Control electronics" is understood in particular to mean a unit with a processor unit and a memory unit, as well as with an operating program stored in the memory unit. In particular, the operating program is intended to process received data.Here, the control and / or regulating unit, the detection unit, and the braking unit are preferably connected to each other, either wired or wirelessly, for electronic data transmission. In particular, the control and / or regulating unit, the detection unit, and the braking unit can receive data and / or transmit data to each other or to other units.

[0014] An embodiment according to the invention advantageously provides a generic machine tool device with improved braking properties. In particular, a braking function adapted to the operating situation of the machine tool can be provided. This advantageously results in increased operational reliability and improved operating comfort when the machine tool is operated by an operator.

[0015] It is further proposed that the detection unit comprise a drive detection element for detecting a drive characteristic of a drive unit of the machine tool and / or the machining tool, wherein the braking function is at least partially automatically adaptable depending on the drive characteristic. In particular, the drive characteristic can comprise parameters that are correlated at least with an operating state of a drive unit of the machine tool and / or the machining tool and / or components of the drive unit, such as a motor, ball bearings, gears, motion converter elements and / or drive shafts, and the like.The drive characteristic can be in the form of a drive current, a drive voltage, a drive power, an electrical drive resistance, an electromotive force characteristic of the drive unit, a drive speed, or as another drive characteristic that appears appropriate to a person skilled in the art. In particular, the drive characteristic can be detected in the form of a drive torque. The drive detection element can in particular comprise at least one drive detection sensor. The drive detection sensor can preferably be designed as a drive current sensor, drive voltage sensor, drive power sensor, drive resistance sensor, electromotive force characteristic sensor of the drive unit, or as a drive speed sensor. This allows the braking function to be adapted particularly precisely to an operating situation and / or to a state of the machine tool and / or the machining tool.In particular, different machining tools can be advantageously braked by adapting the braking function, whereby a suitable, in particular shortest, braking time as well as a wear-optimized and comfortable braking and starting time are determined for a respective machining tool.

[0016] Furthermore, it is proposed that the drive characteristic comprise a starting characteristic. In particular, the starting characteristic comprises starting characteristic parameters that can be detected during a dynamic transition of the machine tool and / or the machining tool from a rest state of the machine tool and / or the machining tool to at least one operating state of the machine tool and / or the machining tool in which the workpiece can be machined. The starting characteristic can be in the form of a starting power, a starting current, a starting voltage, an electrical starting resistance, an electromotive starting force characteristic of the drive unit, a starting speed, a starting torque, or as another starting characteristic that appears appropriate to a person skilled in the art. The drive detection element can in particular comprise at least one starting detection sensor.The start-up detection sensor can be designed, in particular, as a start-up current sensor, start-up voltage sensor, start-up power sensor, start-up resistance sensor, start-up time sensor, or as an electromotive start-up force characteristic sensor. This allows the inertia of the machine tool and / or the machining tool to be determined, particularly during a start-up operating state, and the braking function to be adjusted accordingly.

[0017] It is further proposed that the drive parameter comprise a speed parameter. In particular, the drive parameter can comprise a speed parameter of the machine tool, in particular of the drive unit of the machine tool, and / or of the machining tool. In particular, the speed parameter can be designed as a speed, rotational speed and / or direction of rotation, wherein the speed parameter can be measured directly or indirectly. The drive detection element can in particular comprise at least one speed sensor. In particular, the speed sensor detects changes in a magnetic field which is correlated with a speed of the machine tool and / or the machining tool. As a result, an operating state of the machine tool and / or the machining tool can be determined using the speed parameter and, advantageously, the braking function can be adapted appropriately. This can increase the operational reliability of the machine tool.

[0018] In particular, the drive characteristic and the speed characteristic can be used to determine a starting time until a specified nominal speed of the machine tool and / or machining tool is reached. This allows the braking function to be adjusted and / or optimized.

[0019] Furthermore, it is proposed that the drive parameter comprise a torque parameter. The torque parameter can be in the form of a torque power, a torque current, a rotational speed, and / or an electromotive torque force parameter of the drive unit. The drive detection element can, in particular, comprise at least one torque sensor. The torque sensor can, in particular, be designed as a power sensor and / or as a rotational speed sensor. This advantageously makes it possible to determine an operating state of the machine tool and / or the machining tool. For example, an idling state of the machine tool and / or the machining tool can be distinguished from a machining operating state. Furthermore, a distinction is possible between tools with different torque levels. This makes it possible to specifically adapt the braking function of the machine tool device.This can protect the operator from injuries while operating the machine tool.

[0020] In particular, the start-up detection sensor and / or the speed sensor and / or the torque sensor can be designed as a single sensor or at least partially in one piece. The term "partially integral" for two or more sensors should be understood to mean, in particular, that the sensors have at least one, in particular at least two, advantageously at least three common elements that are components, in particular functionally important components, of both or more sensors. It is conceivable for one sensor to detect multiple parameters, for example, the speed parameter and the torque parameter.

[0021] It is further proposed that the detection unit comprise a kickback detection element for detecting a kickback characteristic of the machine tool and / or the machining tool, and that the braking function is at least partially automatically adaptable depending on the kickback characteristic. The kickback detection element can, in particular, comprise at least one kickback sensor. In particular, the control and / or regulating unit takes the kickback characteristic into account in order to suitably adapt the braking function of the braking unit in at least one operating state, for example, in the event of a sudden stop of the machining tool, in particular to prevent an uncontrolled movement of the machine tool connected to the machining tool.Preferably, the kickback sensor is designed as a motion sensor and / or acceleration sensor and / or speed sensor, wherein the control and / or regulating unit processes the signal of the motion sensor and / or acceleration sensor and / or speed sensor and in particular detects a blocking of the machining tool and a movement of the machine tool housing as a result of a pulse transmission from the machining tool to the machine tool housing.

[0022] In particular, it is conceivable for the kickback detection element and the drive detection element to be formed as a single piece. The term "partially integral" refers in particular to the fact that the units have at least one, in particular at least two, advantageously at least three common elements, in particular common sensors, which are components, in particular functionally important components, of both units. In particular, an exceedance of a critical limit value of the torque characteristic can be interpreted as a kickback characteristic by the control and / or regulating unit, and the braking function can be adjusted. It is also conceivable that if a value of a change in the speed characteristic exceeds a critical limit value within a specified time range, for example, within one millisecond, the control and / or regulating unit adapts the braking function accordingly.This allows for targeted adjustment of the braking function, taking the kickback characteristic into account, and ensures greater operational safety. This allows the operator to continue operating or shut down the machine tool in a controlled manner without risking injury from uncontrolled movement of the machine tool and / or an unsafe footing and the resulting potential fall of the operator.

[0023] It is also proposed that the detection unit have a wear detection element for detecting a wear characteristic of the machine tool and / or the machining tool, and that the braking function is at least partially automatically adaptable depending on the wear characteristic. The wear detection element can, in particular, comprise at least one wear sensor. In particular, at least one sensor of the drive detection element can be designed as a wear sensor. In particular, the wear characteristic can be correlated with a weight of the machining tool, wherein, in particular, a change in the weight of the machining tool and / or the machine tool can be detected, thus making it possible to determine wear of the machining tool and / or the machine tool. In particular, the wear characteristic can be correlated with a time required for a braking and / or starting process of the machining tool.The wear parameter can preferably be determined indirectly during a start-up process and / or in an ongoing operating state, in particular by determining a value and / or a change in value for a current, a voltage, a power, a time, an electrical resistance and / or an electromotive force parameter. A comparison of the values ​​and / or a change in value, for example with a reference value table, can provide conclusions about the wear state of the machine tool and / or the machining tool. The wear sensor can in particular be designed as an unbalance sensor, power sensor, current sensor, voltage sensor, resistance sensor and / or force parameter sensor. In particular, the wear detection element and the drive detection element are formed as a single piece. This allows costs to be reduced due to the use of a smaller number of components.This allows the braking function to be adjusted to the wear condition, particularly of the machining tool, and, in particular, to prevent damage to the machining tool and / or the machine tool and / or the workpiece being machined in a timely manner. This results in increased operational reliability.

[0024] It is further proposed that the detection unit comprise a position detection element for detecting a position parameter of the machine tool and / or the machining tool, and that the braking function is at least partially automatically adaptable depending on the position parameter. The position detection element can, in particular, comprise at least one position sensor. In particular, the position parameter is provided for determining a spatial position, in particular a position and / or orientation, of the machine tool and / or the machining tool and / or a relative position, in particular a position and / or orientation of the machine tool and the machining tool relative to one another.Advantageously, the position parameter is linked to a change in the spatial position of the machine tool and / or the machining tool, whereby a particularly rapid temporal change in the spatial position of the machine tool and / or the machining tool can indicate a malfunction, such as a potentially dangerous detachment of the machining tool from the machine tool and / or an uncontrolled movement of the tool. In particular, the position sensor can be designed as a motion sensor. However, it is also conceivable for the position sensor to be designed as a gyroscope, as a magnetometer for detecting the position by measuring an earth's magnetic field, and / or as a GPS sensor. This allows the braking function to be suitably adjusted so that, in particular, no additional torque of the machine tool can arise, thus ensuring operational safety and minimizing the risk of injury to the operator.In particular, this can prevent the machine tool from twisting and / or slipping in the operator's hands.

[0025] Furthermore, it is proposed that the detection unit have a fall detection element for detecting a fall characteristic when the machine tool and / or the machining tool falls, and that the braking function is at least partially automatically adaptable depending on the fall characteristic. The fall detection element can, in particular, comprise at least one fall sensor. In particular, a free fall of the machine tool and / or the machining tool can be detected. In particular, the fall sensor can be designed as a motion and / or acceleration sensor. Advantageously, the fall sensor is designed as a 6-axis motion sensor, which detects an acceleration and / or a rotation rate of the machining tool and / or the machine tool, in particular with respect to three axes X, Y, Z of the Cartesian coordinate system.Furthermore, the fall sensor can be designed as a piezoelectric acceleration sensor, an acceleration sensor based on a spring-mass principle, or an acceleration sensor based on magnetic induction. It is also conceivable that, in the event of an accidental fall by the operator, the machine tool is appropriately braked, thereby reducing the additional risk of injury. A suitable adaptation of the braking function can advantageously at least partially prevent an additional acceleration of the machine tool and / or the machining tool caused by inappropriate braking in addition to the initial acceleration and initial direction of movement of the machine tool and / or the machining tool during free fall. This can, in particular, prevent industrial accidents and thus achieve additional operational safety.In particular, the position detection element and the fall detection element can be formed in one piece.

[0026] Furthermore, it is proposed that the detection unit comprise a holding force detection element for detecting a holding force characteristic of the machine tool and / or the machining tool, and that the braking function is at least partially automatically adaptable depending on the holding force characteristic. The holding force detection element can, in particular, comprise at least one holding force sensor. A "holding force characteristic" is to be understood, in particular, as a quantity correlated with a force that counteracts another force as a result of a force-, form-, and / or material-fit connection between two connection partners. The additional force acts to spatially separate the two connection partners and / or to change a relative position and / or a relative orientation of the two connection partners to one another. Such a connection preferably exists between the machine tool and the operator.In particular, the holding force parameter of the machine tool can detect a secure connection between the machine tool and the operator and thus, for example, any risk of unintentional release of the machine tool, and adapt the braking function accordingly. Preferably, the braking of the machining tool can be proportional to the holding force parameter. In particular, the holding force sensor is designed as a pressure sensor, infrared sensor, acceleration sensor and / or a motion sensor. In particular, the control and / or regulating unit processes the holding force parameter together with the fall parameter and / or the kickback parameter, since unintentional release of the machine tool due to blocking of the machining tool arranged on the machine tool can lead to the machine tool falling. In this way, the braking function can be adapted more efficiently. This can particularly advantageously increase operational reliability.Furthermore, the holding force characteristic of the machining tool can advantageously be correlated with a secure connection between the machine tool and the machining tool. This can, in particular, achieve advantageous power transmission and correct functioning of the machine tool.

[0027] It is further proposed that the detection unit comprise a temperature detection element for detecting a temperature characteristic of the machine tool, in particular of a part of the machine tool, and / or of the machining tool, and that the braking function is at least partially automatically adaptable depending on the temperature characteristic. The temperature detection element can in particular comprise at least one temperature sensor. The temperature sensor can be designed as an infrared sensor, resistance thermometer, thermocouple, or as a sensor that generates a temperature-dependent electrical signal. In particular, emergency braking can be initiated if a critical temperature is exceeded. This advantageously prevents, in particular, malfunction and / or destruction due to overheating of the machine tool and / or the machining tool during a braking process.In particular, this can minimize the risk of fire during the braking process of the machine tool.

[0028] It is further proposed that the detection unit have an angle detection element for detecting an angular velocity characteristic and / or an angular acceleration characteristic of the machine tool and / or the machining tool, and that the braking function is at least partially automatically adaptable depending on the angular velocity characteristic and / or an angular acceleration characteristic. The angle detection element can, in particular, comprise at least one angle sensor. In particular, the angular velocity characteristic and / or the angular acceleration characteristic can correlate with a secure positioning and / or arrangement of the machine tool and / or the machining tool in at least one operating state. If a specified value for an angular velocity and / or an angular acceleration is undershot and / or exceeded, the braking function can be automatically adapted.The angle sensor can advantageously be designed as a yaw rate sensor. It is also possible to configure the angle sensor as a Hall sensor, potentiometric angle sensor, and / or AMR angle sensor. In particular, the angular velocity and / or angular acceleration can indicate an unsafe grip on the machine tool by the operator. This advantageously allows for a safe and efficient braking process. In particular, the position detection element and / or the fall detection element and / or the angle detection element can be formed as a single piece. In particular, the angular velocity parameter and / or an angular acceleration parameter and the drive parameter can be used to control and / or regulate the braking function. For example, braking of the machining tool can be adapted to the wear level of the machining tool.In particular, the braking function can be adjusted depending on the angular velocity parameter and / or the angular acceleration parameter with the holding force parameter. This allows for rapid deceleration of the machining tool.

[0029] In addition, a method for operating a machine tool device is proposed, wherein at least one braking function of the machine tool device is adjusted at least partially automatically, namely dynamically, depending on at least one detected characteristic variable of the machine tool and / or a machining tool arranged on the machine tool. A high level of operating convenience can advantageously be realized. In particular, a high level of operational reliability can be achieved. The machine tool device according to the invention and the method for operating the machine tool device are not intended to be limited to the application and embodiment described above. Furthermore, in the value ranges specified in this disclosure, values ​​lying within the stated limits are also intended to be disclosed and can be used arbitrarily. drawing

[0030] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination.

[0031] They show: Fig. 1 is a schematic view of a portable machine tool with a machine tool device, Fig. 2 is a schematic representation of the machine tool device with a detection unit in various possible embodiments and with a braking unit, and Fig. 3 is a flow chart of a method for operating the machine tool device. Description of the embodiments

[0032] Figure 1shows a portable machine tool 12. The machine tool 12 is designed as an angle grinder. A machining tool 14 is arranged on the machine tool 12. The machining tool 14 is designed as a cutting or grinding wheel. The machine tool 12 comprises a drive unit 20, which drives the machining tool 14 in at least one operating state. The machine tool 12 has a machine tool housing 38. The drive unit 20 is arranged at least partially in the machine tool housing 38.

[0033] The machine tool 12 comprises a machine tool device 10. The machine tool device 10 is provided for controlling and / or regulating at least one machine tool function of the machine tool 12.

[0034] The machine tool device 10 has a braking unit 18. The braking unit 18 is at least partially arranged in the machine tool housing 38. The braking unit 18 provides a braking function. The braking unit 18 is intended to at least partially decelerate the machining tool 14 or bring it to a standstill.

[0035] The machine tool device 10 has a control and / or regulating unit 48 which is provided to control the drive unit 20 and the brake unit 18.

[0036] The machine tool device 10 has a detection unit 16. The detection unit 16 is provided for detecting at least one characteristic variable of the machine tool 12 and / or the machining tool 14 arranged on the machine tool 12. The detection unit 16 is arranged at least partially in the machine tool housing 38. The detection unit 16 can have one or more detection elements (see. Fig. 2 ).

[0037] The control and / or regulation unit 48 is connected to the detection unit 16 wirelessly or by wire. The detection unit 16 transmits the recorded parameters to the control and / or regulation unit 48 (see Fig. 2). The parameters provided by the detection elements of the detection unit 16 can be evaluated individually or in any combination by means of the control and / or regulating unit 48. The control and / or regulating unit 48 can adapt at least one braking function of the braking unit 18 depending on the at least one parameter detected by the detection unit 16.

[0038] The detection unit 16 can have a drive detection element 22. The drive detection element 22 is provided for detecting a drive characteristic of the drive unit 20 of the machine tool 12 and / or the machining tool 14. In particular, the drive unit 20 of the machine tool 12 can have a motor, in particular an electric motor, and power transmission elements, for example a drive shaft, gears, and the like, for transmitting a motor force to the machining tool 14. The braking function of the machine tool 12 can be automatically adapted depending on the drive characteristic. The adaptation of the braking function takes place in a dynamic speed range, in particular during a braking process.

[0039] The drive characteristic may include a starting characteristic. The detection unit 16 takes the starting characteristic into account when adjusting the braking function of the braking unit 18. The starting characteristic can be detected in the dynamic speed range, in particular during a startup of the machine tool 12, in particular after the machine tool 12 is switched on, from a rest state into at least one operating state of the machine tool 12 with an at least substantially constant speed range.

[0040] In particular, the startup parameter includes a time required for the startup of the machine tool 12. The startup parameter includes a power consumed during the startup of the machine tool 12 until the machine tool 12 reaches at least one operating state for machining a workpiece.

[0041] The drive parameter can include a speed parameter. The speed parameter includes a parameter for a speed or a variable correlated with the speed of the machining tool 14 and / or the machine tool 12 or a machine tool element. The speed parameter can be measured continuously or at specified time intervals. The speed parameter can be measured indirectly, in particular by measuring the power consumption of the machine tool 12 during ongoing operation and subsequently comparing a measured power consumption value with reference values. The speed parameter can be different for different machining tools 14.

[0042] The drive parameter can include a torque parameter. The torque parameter represents a characteristic value for different machining tools 14. In particular, the characteristic value of the torque parameter is correlated with a weight of the machining tool 14 and / or with a weight distribution within the machining tool 14. The torque parameter can be determined indirectly. In particular, the torque parameter can be determined using a starting current. In addition, the torque parameter could be correlated with a startup time of the machine tool 12 and / or the machining tool 14.

[0043] The starting characteristic and / or the speed characteristic and / or the torque characteristic are provided for adapting the braking function of the braking unit 18 of the machine tool 12 individually or in any combination thereof.

[0044] The detection unit 16 can have a wear detection element 26. The wear detection element 26 is provided for detecting a wear characteristic of the machine tool 12 and / or the machining tool 14. The wear characteristic can be correlated with a change in the weight of the machining tool 14. The wear detection element 26 indirectly detects the change in the weight of the machining tool 14. The change in weight is measurable in the dynamic speed range, in particular when the machine tool 12 is running up and / or when the machine tool 12 is braking.

[0045] The wear detection element 26 can be formed separately from other detection elements. However, it is conceivable for the wear detection element 26 and the drive detection element 22 to be formed as a single piece. It is also conceivable for the wear characteristic to be determined from the starting characteristic and / or the speed characteristic and / or the torque characteristic with the aid of reference tables. The detection of the wear characteristic is provided, in particular, to determine the degree of wear of the machining tool 14. By detecting the wear characteristic, a distinction can be made between a worn machining tool 14 and a new machining tool 14 that is different from the worn machining tool 14. The braking function can be adjusted at least partially automatically depending on the wear characteristic.

[0046] The detection unit 16 can have a position detection element 28. The position detection element 28 is provided for detecting a position parameter of the machine tool 12 and / or the machining tool 14. The braking function of the braking unit 18 of the machine tool device 10 can be adjusted at least partially automatically depending on the position parameter (see FIG. Fig. 2 ). The position parameter represents a three-dimensional orientation of the machine tool 12 and / or the machining tool 14. The position detection element 28 indicates an unfavorable and / or dangerous orientation of the machine tool 12 and / or the machining tool 14. The braking function of the braking unit 18 initiates an automatically adjusted emergency braking process based on a transmitted signal from the position detection element 28.

[0047] The position detection element 28 can advantageously indicate a desired orientation of the machine tool 12 and / or the machining tool 14, for example, a horizontal or vertical orientation. It is conceivable that, in particular, any orientation of the machine tool 12 and / or the machining tool 14 can be specified for targeted machining of the workpiece. The braking function of the braking unit 18 can be adapted to the specified orientation of the machine tool 12 and / or the machining tool 14.

[0048] The detection unit 16 can have an angle detection element 36. The angle detection element 36 is provided for detecting an angular velocity characteristic and / or an angular acceleration characteristic of the machine tool 12 and / or the machining tool 14. The braking function can be at least partially automatically adapted depending on the angular velocity characteristic and / or an angular acceleration characteristic (see FIG. Fig. 2). At the beginning of the braking process, the angle detection element 36 detects the angular velocity characteristic and / or the angular acceleration characteristic. If a limit value for the angular velocity characteristic and / or the angular acceleration characteristic is exceeded, the braking unit 18 adapts the braking function in such a way that no uncontrolled rotation of the machine tool 12 and / or the machining tool 14 occurs. If the limit value for the angular velocity characteristic and / or the angular acceleration characteristic is undershot, the machine tool 12 and / or the machining tool 14 decelerates more quickly due to the automatic adaptation of the braking function. The angle detection element 36 is preferably designed as a rotation rate sensor.

[0049] It is conceivable that the position detection element 28 and the angle detection element 36 are designed as a unit in the form of a 6-axis motion sensor.

[0050] The detection unit 16 can have a fall detection element 30. The fall detection element 30 is provided for detecting a fall characteristic when the machine tool 12 and / or the machining tool 14 falls. The braking function can be adjusted at least partially automatically depending on the fall characteristic (see FIG. Fig. 2 ). The drop characteristic detects an uncontrolled movement and / or acceleration pattern of the machine tool 12 and / or the machining tool 14. The drop characteristic comprises a rotation rate of the machine tool housing 38 of the machine tool 12. The drop characteristic comprises the rotational speed characteristic of the machining tool 14.

[0051] The braking function of the braking unit 18 prevents the complete braking of the machine tool 12 and / or the machining tool 14 if a limit value of the rotation rate of the machine tool housing 38 is exceeded. Thus, the braking function prevents an unwanted acceleration of the rotation rate of the machine tool housing 38 due to the conservation of angular momentum between the machining tool 14 and the machine tool 12.

[0052] The detection unit 16 can have a kickback detection element 24. The kickback detection element 24 is provided for detecting a kickback characteristic of the machine tool 12 and / or the machining tool 14. The braking function can be adjusted at least partially automatically depending on the kickback characteristic (see Fig. 2 Depending on the intensity of the uncontrolled braking of the machining tool 14, the detection unit 16 influences the braking function accordingly.

[0053] The detection unit 16 can have a holding force detection element 32. The holding force detection element 32 is provided for detecting a holding force characteristic of the machine tool 12 and / or the machining tool 14. The braking function can be adjusted at least partially automatically depending on the holding force characteristic (see Fig. 2 ). Preferably, the holding force detection element 32 is designed as a pressure sensor. The time required to completely decelerate the machine tool 12 and / or the machining tool 14 is correlated with the holding force parameter. The greater the holding force acting on the machine tool 12 and / or the machining tool 14, the faster the machine tool 12 and / or the machining tool 14 can be decelerated.

[0054] The detection unit 16 can have a temperature detection element 34. The temperature detection element 34 is provided for detecting a temperature characteristic of the machine tool 12, in particular of a part of the machine tool 12, and / or of the machining tool 14. The braking function can be adjusted at least partially automatically depending on the temperature characteristic (see Fig. 2 ). The temperature parameter is correlated with at least one operating state of the machine tool 12 and / or the machining tool 14. In the event of an overheating operating state of the machine tool 12 and / or the machining tool 14, the braking unit 18 initiates an emergency braking. Alternatively, the braking function can be adjusted such that a continued machining operating state of the machine tool 12 and / or the machining tool 14 is possible with reduced heat development.

[0055] Figure 3shows a flow diagram of a method for operating a machine tool device 10. The method comprises at least a first method step 40, in which one or more characteristic variables are detected simultaneously or successively by means of one or more detection elements 22, 24, 26, 28, 30, 32, 34, 36.

[0056] The method comprises at least a second method step 42 in which the recorded characteristic or the recorded characteristic values ​​are transmitted to the control and / or regulating unit 48 for evaluation and / or processing.

[0057] The method comprises at least a third method step 44, in which control and / or regulation signals from the control and / or regulation unit 48 are transmitted to the braking unit 18. Thus, at least one braking parameter of the braking unit 18 is at least partially automatically adjusted depending on one or more parameters.

[0058] The method comprises at least a fourth method step 46, in which the respective characteristic variable or variables is / are detected again by means of the detection element or elements 22, 24, 26, 28, 30, 32, 34, 36 and transmitted to the control and / or regulating unit 48. In the fourth method step 46, the newly detected characteristic variable or variables is / are compared with the characteristic variable or variables detected in the first method step 40 by the control and / or regulating unit 48. The control and / or regulating unit 48 determines a comparison result. At least one braking characteristic of the braking unit 18 is adjusted again by means of the control and / or regulating signal of the detection unit 16 depending on the comparison result of the characteristics.In at least one operating state, the fourth method step 46 is carried out in a continuous loop during the entire operation of the machine tool 12.

Claims

1. Power tool device (10) for open-loop and / or closed-loop control of at least one power tool function of a power tool (12), in particular a portable power tool (12), comprising at least one acquisition unit (16) for acquiring at least one characteristic variable of the power tool (12) and / or of a work tool (14) arranged on the power tool (12), and comprising at least one braking unit (18), wherein at least one braking function of the braking unit (18) can be adapted at least partially automatically, to be precise dynamically, in dependence on the at least one acquired characteristic variable, wherein the braking function can be actively changed continuously over time or can be actively or passively changed within a period of time or for a duration of a process, characterized in that the acquisition unit (16) has a holding-force acquisition element (32) for acquiring a holding-force characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the holding-force characteristic variable, wherein a time for complete braking of the power tool (12) and / or of the work tool (14) is correlated with the holding-force characteristic variable.

2. Power tool device (10) according to Claim 1, characterized in that the acquisition unit (16) has a drive acquisition element (22) for acquiring a drive characteristic variable of a drive unit (20) of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the drive characteristic variable.

3. Power tool device (10) according to Claim 2, characterized in that the drive characteristic variable comprises a startup characteristic variable.

4. Power tool device (10) according to Claim 2 or 3, characterized in that the drive characteristic variable comprises a rotational-speed characteristic variable.

5. Power tool device (10) according to one of Claims 2 to 4, characterized in that the drive characteristic variable comprises a torque characteristic variable.

6. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has a kickback acquisition element (24) for acquiring a kickback characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the kickback characteristic variable.

7. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has a wear acquisition element (26) for acquiring a wear characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the wear characteristic variable.

8. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has a position acquisition element (28) for acquiring a position characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the position characteristic variable.

9. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has a fall acquisition element (30) for acquiring a fall characteristic variable if the power tool (12) and / or the work tool (14) falls down and the braking function can be adapted at least partially automatically in dependence on the fall characteristic variable.

10. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has a temperature acquisition element (34) for acquiring a temperature characteristic variable of the power tool (12), in particular of a part of the power tool (12), and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the temperature characteristic variable.

11. Power tool device (10) according to one of the preceding claims, characterized in that the acquisition unit (16) has an angle acquisition element (36) for acquiring an angular-velocity characteristic variable and / or an angular-acceleration characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function can be adapted at least partially automatically in dependence on the angular-velocity characteristic variable and / or an angular-acceleration characteristic variable.

12. Power tool (12), in particular a portable power tool (12), having at least one power tool device (10) according to one of the preceding claims.

13. Method for operating a power tool device (10), in particular according to one of Claims 1 to 11, wherein at least one braking function of the power tool device (10) is adapted at least partially automatically, to be precise dynamically, in dependence on at least one acquired characteristic variable of the power tool (12) and / or of a work tool (14) arranged on the power tool (12), wherein the braking function is actively changed continuously over time or is actively or passively changed within a period of time or for a duration of a process, characterized in that a holding-force acquisition element (32) of an acquisition unit (16) of the power tool device (10) acquires a holding-force characteristic variable of the power tool (12) and / or of the work tool (14) and the braking function is adapted at least partially automatically in dependence on the holding-force characteristic variable, wherein the time for complete braking of the power tool (12) and / or of the work tool (14) is correlated with the holding-force characteristic variable.