Method for open-loop and closed-loop control of a machine tool and detection device and also system for carrying out the method

Abstract

Method for open-loop and closed-loop control of a machine tool (2), the machine tool (2) being connected to at least one detection device (3, 3'), containing the method steps of: - measuring a first distance value by way of at least one sensor (14) of the detection device (3, 3'); - inputting at least one route value into the detection device (3, 3') by way of an input unit; - adjusting the machine tool (2) from a first operating mode having at least one first operating parameter to a second operating mode having at least one second operating parameter; - measuring at least one second distance value in a predetermined period of time; - transmitting at least one signal from the detection device (3, 3') to the machine tool on the basis of the measured at least one second distance value; and - adjusting the machine tool (2) from the second operating mode to a third operating mode having at least one third operating parameter after a predetermined signal has been received. The present invention further relates to a detection device for carrying out the method. In addition, the present invention relates to a system containing a machine tool and a detection device for carrying out the method.

Description

[0001] Method for controlling and regulating a machine tool and detection device, as well as system for carrying out the method

[0002] The present invention relates to a method for controlling and regulating a machine tool, wherein the machine tool is connected to at least one detection device.

[0003] Furthermore, the present invention relates to a detection device for carrying out the method.

[0004] Furthermore, the present invention relates to a system comprising a machine tool and a detection device for carrying out the method.

[0005] Machine tools in the form of drilling rigs (i.e., hammer drills, drilling machines, or core drills) for creating cylindrical boreholes are widely known in the state of the art. When creating a borehole, in addition to the correct diameter, the actual borehole depth is also of great importance.

[0006] For measuring or recording the current borehole depth, there are also numerous state-of-the-art devices of various designs and functions. However, these existing devices are inaccurate and therefore problematic to use.

[0007] It is therefore an object of the present invention to solve the problem described above.

[0008] The object is achieved by the subject matter of independent patent claims 1, 9 and 12. Advantageous embodiments of the subject matter according to the invention are contained in the respective dependent patent claims.

[0009] The object is achieved in particular by a method for controlling and regulating a machine tool, wherein the machine tool is connected to at least one detection device.

[0010] According to the invention, the following process steps are provided

[0011] - Detecting a first distance value by at least one sensor of the detection device; - Inputting at least one distance value into the detection device by an input device;

[0012] - setting the machine tool from a first operating mode with at least one first operating characteristic to a second operating mode with at least one second operating characteristic;

[0013] - detecting at least one second distance value in a predetermined period of time;

[0014] - sending at least one signal from the detection device to the machine tool in dependence on the detected at least second distance value; and

[0015] - Setting the machine tool from the second operating mode to a third operating mode with at least one third operating characteristic after receiving a predetermined signal.

[0016] The at least one sensor of the detection device can be based on a time-of-flight measurement, e.g. an ultrasonic measurement.

[0017] In particular, it is possible to include at least a first and a second detection device, wherein the at least one first detection device can detect a first distance value and the at least one second detection device can detect a second distance value at the same time. At the beginning of the drilling cycle, the first and second distance values ​​do not have to be identical. The detection of at least one first and second distance value serves to detect a spatial position of the machine tool with respect to the workpiece being machined. The more detection devices are provided at different positions on the housing of the machine tool, the more accurate the determination of the spatial position of the machine tool.If, during continuous detection of distance values ​​by the first and second detection devices during the drilling process, a predetermined difference value between the detected distance values ​​of the first detection device and the detected distance values ​​of the second detection device is determined with the aid of the control device of the machine tool, the machine tool can be adjusted from a first operating mode with at least one first operating characteristic value to a second operating mode with at least one second operating characteristic value. This can prevent an oblique, i.e., non-orthogonal, alignment of the machine tool to a workpiece being machined.

[0018] According to an alternative embodiment, it may be possible for the machine tool to be set from the first operating mode with at least the first operating characteristic value to the second operating mode with at least the second operating characteristic value depending on at least one characteristic value of a material to be machined. The first operating mode can be an activation state of the machine tool. The first operating characteristic value can be a first speed value of the drive (e.g. motor). The second operating mode can be either an activation state or a deactivation state of the machine tool. The second operating characteristic value can be a second speed value of the drive, which is either lower or higher than the first speed value. The second speed value can also be zero, so that no torque is generated by the drive.

[0019] According to an advantageous embodiment, it may be possible for the machine tool to be adjusted from the first operating mode with at least the first operating characteristic value to the second operating mode with at least the second operating characteristic value depending on the length of the travel distance. Thus, it is possible for the rotational speed to be reduced to zero when a certain drilling depth (i.e., travel distance) has been reached.

[0020] The first and / or second operating characteristic can be a speed or torque.

[0021] According to a further advantageous embodiment, it may be possible for the machine tool to be adjusted from the first operating mode with at least the first operating characteristic to the second operating mode with at least the second operating characteristic depending on the diameter of a borehole to be created by the machine tool. This makes it easy to set a maximum speed for the drive for a diameter of a drill bit or for a drill, or to limit the speed for the drive.

[0022] According to a further advantageous embodiment, it may be possible for the at least one signal to be sent from the detection device to the machine tool depending on the detected at least second distance value, either directly from the detection device to the machine tool or via an external device. This allows a specific drilling depth to be displayed to a user. The drive speed can remain the same, be increased, or reduced.

[0023] The external device can be configured in the form of a smartphone, a tablet, or a smartwatch. According to a further advantageous embodiment, it may be possible for the third operating mode to correspond to a deactivation state of the machine tool. In the third operating mode, the speed value and / or the torque value can be zero.

[0024] According to a further advantageous embodiment, it may be possible for a tool of the machine tool to be operated in a first direction of rotation in the first and / or second operating mode and in a second direction of rotation in the third operating mode. This can facilitate the removal of a drilling tool (e.g., a drill bit) from a drilled hole after reaching a certain drilling depth.

[0025] According to a further advantageous embodiment, it may be possible for the operating characteristics of the machine tool to be a speed value or a torque value.

[0026] Furthermore, the object is achieved by a detection device for carrying out the method.

[0027] According to the invention, it is provided that at least one sensor, one control device, one interface device and one communication device are included.

[0028] According to an advantageous embodiment, it may be possible to include at least one sensor, one control device, one interface device and one communication device.

[0029] The interface device can be designed in the form of a suitable positive and / or non-positive connection in order to establish a fixed or removable connection between the detection device and the machine tool.

[0030] The communication device can be based on a wireless and / or wired data transmission technology.

[0031] According to a further advantageous embodiment, it may be possible for the detection device to be releasably connected to the machine tool.

[0032] According to an alternative advantageous embodiment, it may be possible for the detection device to be fixedly connected to the machine tool.

[0033] Furthermore, the object is achieved by a system comprising a machine tool and a detection device for carrying out the method. According to the invention, the machine tool contains at least one machine tool interface and the detection device contains at least one detection device interface, wherein the machine tool interface and the detection device interface can be permanently or detachably connected to one another.

[0034] Further advantages will become apparent from the following description of the figures. The figures illustrate various embodiments of the present invention.

[0035] The figures, the description, and the claims contain numerous features in combination. The skilled person will also expediently consider the features individually and combine them into further meaningful combinations.

[0036] They show:

[0037] Figure 1 shows a side view of a machine tool according to a first embodiment and a detection device connected to the machine tool according to a first embodiment at the start of a drilling curtain on a workpiece;

[0038] Figure 2 is a side view of the detection device connected to the machine tool during or at the end of a drilling operation on the workpiece;

[0039] Figure 3 shows a further side view of the machine tool and the detection device according to the first embodiment together with a device;

[0040] Figure 4 shows a further side view of the machine tool and the detection device according to a second embodiment; and

[0041] Figure 5 shows a further side view of the machine tool with a first and second detection device.

[0042] Examples of implementation:

[0043] Figure 1 shows a system 1 according to the invention comprising a machine tool 2 and a detection device 3 according to the invention.

[0044] The machine tool 2 is designed in the form of a hammer drill.

[0045] According to an alternative embodiment not shown in the figures, the machine tool 2 can also be designed in the form of a drilling machine and a core drilling device.

[0046] The machine tool 2 according to a first embodiment essentially contains a housing 4, a handle 5, a tool holder 6 and a power supply 7.

[0047] The housing 4 has a top side 4a, a bottom side 4b, a front end 4c, and a rear end 4d. Inside the housing 4 are a drive 20, a transmission device, a control device 12, and a drive shaft. The control device 12 serves to control and regulate the individual functions of the machine tool 2 and is indicated in Figure 4.

[0048] The handle 5 is positioned at the rear end 4d of the housing 4 of the machine tool 2 and serves to hold and guide the machine tool 2. An additional handle 8 for additionally holding and guiding the machine tool 2 is also positioned at the front end of the housing 4c of the machine tool 2.

[0049] The drive 20 is configured as a brushless electric motor and serves to generate torque. The drive 20 is connected to the control device 12 so that the control device 12 can regulate functions of the drive 20, such as the speed and / or torque.

[0050] Furthermore, the drive 20, the transmission device, the control device 12, and the drive shaft are arranged inside the housing 4 and relative to one another in such a way that the torque generated by the drive 20 can be transmitted to the transmission device and the drive shaft. The tool holder 6 is positioned on the top side 4a of the housing 4 and arranged relative to the drive shaft in such a way that the torque from the drive shaft is transmitted to the tool holder 6. The tool holder 6 serves to receive and hold a tool 9. The tool 9 is designed in the form of a drill bit in the figures.

[0051] The gear device and the drive shaft are not shown in the figures.

[0052] The power supply 7 serves to supply the machine tool 2, in particular the loads of the machine tool 2, with electrical energy and is designed in the form of a mains connection. According to an alternative embodiment not shown in the figures, the power supply can also be designed in the form of one or more accumulators.

[0053] As can be seen particularly in Figure 4, according to a second embodiment, the machine tool 2 can also contain a communication device 10, which is also positioned inside the housing 4 of the machine tool 2 and connected to the control device 12 via a corresponding line. By connecting the control device 12 to the communication device 10 of the machine tool 2, data and values ​​can be transmitted in the form of signals from the machine tool 2. The communication device 10 of the machine tool 2 is also designed to transmit and receive data in the form of signals with an external device 19. In the present exemplary embodiment, the communication device 10 of the machine tool 2 is designed using Bluetooth technology.

[0054] Alternatively, the communication device 10 can also be based on WiFi, NFC (Near Field Communication) or another suitable wireless data transmission technology.

[0055] Furthermore, the communication device 10 can also be based on a wired data transmission technology.

[0056] The detection device 3 essentially includes a housing 13, a sensor 14, a control device 15, an interface device 16, an input device, and a communication device 17. The sensor 14, the control device 15, and the communication device 17 are positioned inside the housing 13 of the detection device 3. The interface device 16 is arranged on an underside of the housing of the detection device 3.

[0057] In the present embodiment, the sensor 14 is configured as an ultrasonic sensor and serves to measure or detect distance values. The distance value can also be referred to as a path, distance, or distance. Alternatively, the detection device 3 can also contain more than one sensor 14. In the event that multiple sensors 14 are included in the detection device 3, the sensors 14 can all be the same type of sensor or different types of sensors.

[0058] The control device 15 serves to control and regulate the functions of the detection device 3 and is connected to the sensor 14 via a corresponding line. The control device 15 is thus designed in particular so that data in the form of signals can be detected and processed by the sensor 14. The communication device 17 of the detection device 3 is connected to the control device 15 and serves to send and receive data in the form of signals. With the aid of the communication device 17, the detection device 3 can communicate with an external device 19, i.e. exchange data and values ​​in the form of signals. The external device 19 can be the machine tool 2, another machine tool, a vacuum cleaner, a water supply, or a smartphone.

[0059] In the present embodiment, the external device 19 is configured in the form of a smartphone. The communication device 17 of the detection device is configured based on Bluetooth technology in the present embodiment. Alternatively, the communication device 17 can also be based on Wi-Fi, NFC (Near Field Communication), or another suitable wireless data transmission technology. Furthermore, the communication device 17 can also be based on a wired data transmission technology.

[0060] The input device serves to enter data into the detection device 3 and is designed as an operator input field. The input device is not shown in the figures. Alternatively, the input device can also be configured as the external device 19, so that a specific command or data is entered into the external device 19 (e.g., a smartphone) and received by the detection device 3 via the communication device 17. The external device 19 also has a communication device 18 for this purpose.

[0061] In the present embodiment, the interface device 16 serves to detachably connect the detection device 3 to the housing 4 of the machine tool 2. For this purpose, the interface device 16 is designed with a screw connection. The screw connection is not shown in the figures.

[0062] Alternatively or additionally, the interface device 16 can also be designed in the form of a rail device, snap connection or a suitable positive and / or non-positive connection. The interface device 16 contains in particular an electrical connection to the control device 12 of the machine tool 2. With the aid of the electrical connection, data in the form of signals can be exchanged between the control device 15 of the detection device 3 and the control device 12 of the machine tool 2. Via the electrical connection, for example, a stop signal can be sent from the control device 15 of the detection device 3 and the control device 12 of the machine tool 2 when a specific distance value has been detected by the sensor 14, so that the drive 20 of the machine tool 2 is braked (i.e. slowed down) or stopped by the control device 12.

[0063] To implement the method according to the invention for controlling and regulating a machine tool 2, as shown in Figure 1, a first distance value A is first detected by the sensor 14 of the detection device 3. The detected first distance value A corresponds to an initial distance of the sensor 14 from a material WS to be machined before work or drilling begins and is sent in the form of a signal to the control device 15 of the detection device 3.

[0064] Subsequently, a distance value is input into the detection device 3 via the input device not shown in the figures. The distance value can be a desired borehole depth in the material WS that is to be achieved at the end of the drilling process. The distance value is fed into the control device 15 of the detection device 3 and stored there via a memory. The memory is not shown in the figures. More than one distance value can be fed into the control device 15 of the detection device 3 and stored in the memory.

[0065] In a next method step, the machine tool 2 is set from a first operating mode with at least one first operating characteristic value to a second operating mode with at least one second operating characteristic value. In the present exemplary embodiment, the operating characteristic value (also known as the operating parameter) is a rotational speed of the drive 20, which is designed as an electric motor. The first rotational speed (i.e., the first operating characteristic value) is lower than the second rotational speed (i.e., the second operating characteristic value). The first rotational speed can also be zero, so that the machine tool 2 is initially in a deactivation state.

[0066] Furthermore, a second distance value is recorded by sensor 14 at a predetermined time or after a certain period of time. This period can be 10 seconds. It is possible for a respective distance value to be recorded by sensor 14 at time intervals of 2 to 5 seconds. The time intervals can be greater or less than 2 to 5 seconds.

[0067] The distance value(s) detected by sensor 14 are sent by the detection device 3 to the machine tool 2 in the form of a signal. The transmitted signal is dependent on or related to the respective detected distance value.

[0068] In a further method step, the machine tool 2 is switched from the second operating mode to a third operating mode with at least one third operating characteristic after a predetermined signal has been received from the communication device 10 of the machine tool 2. The predetermined signal corresponds to a distance value B detected by the sensor, which corresponds to the desired or programmed borehole depth. The drilling process should be terminated (see Figure 2).

[0069] The third operating characteristic value is a speed corresponding to zero. In other words, the third operating mode of the machine tool 2 corresponds to a deactivation state in which no speed and consequently no torque is generated by the drive 20. Alternatively, the third operating mode can be a state in which the drive 20 rotates in the opposite direction of rotation to that in the second operating mode. As a result, the tool 9 also rotates in the opposite direction of rotation to that in the second operating mode. Due to the opposite direction of rotation of the tool 9 (i.e. of the drill), no further drilling process (material removal) takes place and the drill hole does not become any deeper. Furthermore, the process of braking the drive 20 and also the opposite rotation of the tool 9 indicates relatively clearly to a user of the machine tool 2 that the desired orprogrammed borehole depth B was reached.

[0070] Figure 5 shows a further embodiment of the machine tool 2 with a first and a second detection device 3, 3'. The two detection devices 3, 3' are essentially identical or have the same construction. Both detection devices 3, 3' each detect a distance value. The first and second detection devices 3, 3' are connected to one another and to the control device 12 of the machine tool 2, so that data and values ​​in the form of signals can be sent and received between the two detection devices 3, 3' and from each detection device 3 to the control device 12 of the machine tool 2. By simultaneously detecting first distance values ​​by the first detection device 3 and second distance values ​​by the second detection device 3', the spatial position, i.e. the position of the machine tool 2 relative to the workpiece WS to be machined, can be determined.In the event of a deviation by a predetermined threshold value (e.g., more than 5° in an x-, y-, or z-axis), the control device 12 of the machine tool 2 can stop the drive 20 or transmit a corresponding warning signal via an output device (not shown in the figures) on the machine tool 2 or to the external device 19. Reference numerals.

[0071] 1 system

[0072] 2 machine tools

[0073] 3, 3' detection device

[0074] 4 Machine tool housing

[0075] 4a Top of the machine tool housing

[0076] 4b Bottom of the machine tool housing

[0077] 4c front end of the machine tool housing

[0078] 4d rear end of the machine tool housing

[0079] 5 Handle

[0080] 6 tool holder

[0081] 7 Energy supply

[0082] 8 Additional handle

[0083] 9 Tools

[0084] 10 Communication device of the machine tool

[0085] 12 Control device of the machine tool

[0086] 13 Housing of the detection device

[0087] 14 Sensor of the detection device

[0088] 15 Control device of the detection device

[0089] 16 Interface device of the detection device

[0090] 17 Communication device of the detection device

[0091] 18 Communication device of the external device

[0092] 19 external device

[0093] 20 drive

[0094] WS material

Claims

Patent claims 1. Method for controlling and regulating a machine tool (2), wherein the machine tool (2) is connected to at least one detection device (3, 3'), characterized by the following method steps - detecting a first distance value by at least one sensor (14) of the detection device (3, 3'); - entering at least one distance value into the detection device (3, 3') by an input device; - setting the machine tool (2) from a first operating mode with at least one first operating characteristic to a second operating mode with at least one second operating characteristic; - detecting at least one second distance value in a predetermined period of time; - sending at least one signal from the detection device (3, 3') to the machine tool in dependence on the detected at least second distance value; and - Setting the machine tool (2) from the second operating mode to a third operating mode with at least one third operating characteristic after receiving a predetermined signal.

2. Method for controlling and regulating a machine tool (2) according to claim 1, characterized in that the setting of the machine tool (2) from the first operating mode with at least the first operating characteristic value to the second operating mode with at least the second operating characteristic value takes place as a function of at least one characteristic value of a material to be machined.

3. Method for controlling and regulating a machine tool (2) according to claim 1 or 2, characterized in that the setting of the machine tool (2) from the first operating mode with at least the first operating characteristic value to the second operating mode with at least the second operating characteristic value takes place as a function of the length of the path. Method for controlling and regulating a machine tool (2) according to at least one of claims 1 to 3, characterized in that the setting of the machine tool (2) from the first operating mode with at least the first operating characteristic value to the second operating mode with at least the second operating characteristic value takes place as a function of a diameter of a borehole to be produced by the machine tool (9). Method for controlling and regulating a machine tool (2) according to at least one of claims 1 to 4, characterized in that the transmission of the at least one signal from the detection device (3, 3') to the machine tool (2) takes place as a function of the detected at least second distance value either directly from the detection device (3, 3') to the machine tool (2) or by means of an external device (19).Method for controlling and regulating a machine tool (2) according to at least one of claims 1 to 5, characterized in that the third operating mode corresponds to a deactivation state of the machine tool (2). Method for controlling and regulating a machine tool (2) according to at least one of claims 1 to 6, characterized in that in the first and / or second operating mode, a tool (9) of the machine tool (2) is operated in a first direction of rotation and in the third operating mode in a second direction of rotation. Method for controlling and regulating a machine tool (2) according to at least one of claims 1 to 6, characterized in that the operating parameters of the machine tool (2) can be a speed value or a torque value. Detection device () for carrying out the method according to at least one of claims 1 to 8. characterized in that at least one sensor (14), a control device (12), an interface device (16) and a communication device (15) are included.

10. Detection device (3, 3') for carrying out the method according to claim 9, characterized in that the detection device (3, 3') is releasably connected to the machine tool (2).

11. Detection device (3, 3') for carrying out the method according to claim 9, characterized in that the detection device (3, 3') is fixedly connected to the machine tool (2).

12. System (1) comprising a machine tool (2) and a detection device (3, 3') for carrying out the method according to at least one of claims 1 to 8, characterized in that the machine tool (2) contains at least one machine tool interface and the detection device (3, 3') contains at least one interface device (16), wherein the machine tool interface and the interface device (16) can be connected to one another permanently or detachably.

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