Tool holder with measuring instrument

Abstract

To provide a tool holder having a measurement instrument.SOLUTION: A tool holder (1) is designed to rotate about a tool holder rotational axis (D) defining an axial direction (31). The tool holder (1) comprises: a tool part (3) having a tool reception configuration (4) for receiving a tool at one axial longitudinal end (2); a connection part (6) having a connection configuration (7) for connection to transmit torque to a spindle of a machine tool at the other axial longitudinal end (5); and a measurement instrument (8) for acquiring data relating to motion of the tool holder (1). In this tool holder (1), the measurement instrument (8) includes a sensor having at least two measurement axes (x, y), in particular, an acceleration sensor, and the two measurement axes (x, y) are defined to be directed roughly in a radial direction with respect to the tool holder rotational axis (D).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tool holder, which is designed to rotate around a tool holder rotation axis (D) defining an axial direction, and has a tool portion at one axial longitudinal end having a tool receiving configuration for receiving a tool, and a connecting portion at the other axial longitudinal end having a connecting configuration for connecting to a machine tool spindle to transmit torque. The tool holder provides a measuring instrument for acquiring data on the operation of the tool holder. [Background technology]

[0002] Tool holders having such measuring instruments are known from (Non-Patent Document 1), (Non-Patent Document 2), or (Non-Patent Document 3).

[0003] In the case of tool holders known from these, the measuring instrument is a one-axis accelerometer having a single measuring axis oriented radially with respect to the tool holder rotation axis (D), and therefore the accelerometer outputs a measuring axis signal assigned to the radial measuring axis.

[0004] This tool holder, equipped with such an acceleration sensor, allows for monitoring of the operational behavior of the tool holder, as described, for example, in the case of a milling operation (where the milling tool is received in the tool receiving configuration of the tool holder), such as observing vibrations or identifying instability, i.e., chatter, by analyzing the measured axis signal measured by the uniaxial acceleration sensor during the milling operation over time or in its frequency spectrum. For example, "abnormal" (e.g., abrupt) changes in the measured axis signal of the uniaxial acceleration sensor over time may indicate instability.

[0005] The drawback of this monitoring case (considered here as an example) of a milling operation using such a tool holder equipped with measuring instruments / accelerometers is that the signals / data output by the measuring instruments of the tool holder for the machining operation only model the operation of the tool holder, in this case milling, only inadequately or with little usefulness, and thus (machining) monitoring is also only possible inadequately. In short, a tool holder equipped with measuring instruments outputs (machining) signals / (machining) data that may be difficult to interpret with respect to the machining. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] In-Process Control with a Sensory Tool Holder to Avoid Chatter, F. Bleicher, et al., Journal of Machine Engineering, 2018, Vol. 18, No. 3, 16-27 [Non-Patent Document 2] Using Sensory Tool Holder Data for Optimizing Production Processes, P. Schorghofer, et al., Journal of Machine Engineering, 2019, Vol. 19, No. 3, 43-55 [Non-Patent Document 3] Method for Determining Edge Chipping in Milling based on Tool Holder Vibration Measurements, F. Bleicher, et al., CIRP Annals - Manufacturing Technology 69 (2020) 101-104 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, an object of the present invention is to provide a tool holder that avoids the shortcomings of the prior art, and in particular to develop a tool holder that can model an operation or machining process with improved usefulness. [Means for solving the problem]

[0008] The aforementioned objective is achieved by a tool holder having the features of the independent claim. The dependent claims and the following description relate to preferred developments of the present invention.

[0009] Terms such as up, down, front, back, left, or right should be understood according to conventional understanding unless otherwise clearly defined. Terms such as radial and axial should be understood in relation to the tool holder's rotation axis (D).

[0010] The term “abbreviated” may be understood (according to the Supreme Court’s understanding) to mean “to a practically significant extent.” Therefore, possible deviations from the precision indicated by this term may occur unintentionally (i.e., without functional basis) due to manufacturing or assembly tolerances, etc.

[0011] A tool holder designed for rotation around a tool holder rotation axis (D) defining the axial direction provides a tool section at one axial longitudinal end having a tool receiving configuration for receiving a tool. At the other axial longitudinal end, a coupling section is provided having a coupling configuration for connecting to transmit torque to the spindle of a machine tool.

[0012] The monitored tool holder also has measuring instruments to acquire data about the tool holder's operation.

[0013] In this case, the measuring instrument is a sensor, in particular an acceleration sensor, having at least two measuring axes, the two measuring axes (x, y) being oriented substantially radially with respect to the tool holder rotation axis (D).

[0014] However, the measuring device may also comprise other sensor systems that output direction-dependent signals, such as force, velocity, or deformation sensors, or a displacement measurement system.

[0015] The invention is discussed below as an example using an acceleration sensor.

[0016] In this case, the acceleration sensor outputs a (measurement / measurement axis) signal assigned to the measurement axis, and thus, for example, in any case, one (measurement) signal for each of one of its measurement axes, and when the (measurement) signal is evaluated or interpreted, or generally processed, it describes or models the operation of the tool holder as (measurement) data. Thus, for the sake of simplicity, the terms "(measurement / measurement axis) signal" and "(measurement) data" may also be used synonymously with each other.

[0017] The tool holder is designed such that an acceleration sensor arranged in the tool holder has at least two measurement axes directed substantially radially with respect to the tool holder rotation axis (D), and it is more appropriately possible to describe or model the operation of the tool holder as the (measurement) signal / (measurement) data generated thereby. Thus, based on the recognition that it is possible to more beneficially describe the machining process performed using a tool holder (having such a sensor structure). Thus, more reliable analysis and improved prediction, for example, of abnormal operating conditions, instability, tool breakage, or tool wear are possible.

[0018] Tests using a tool holder equipped with a sensor have shown that, in particular, a simple uniaxial sensor or a tool holder having a simple uniaxial sensor may output data that is not very beneficial for the machining process, from which it is less likely to reliably identify abnormal operating conditions, instability, tool breakage, tool wear, etc.

[0019] Figure 10 shows, for example, the machining / sensor data of a tool holder. In this case, it is a bottom milling cutter with a tooth number z = 4, and a uniaxial acceleration sensor with one measurement axis oriented in the radial direction (32) is used. The machining parameters are n = 2400 revolutions per minute, a p (depth of cut) = 2 mm, and a e (working engagement) = 4 mm.

[0020] Here, Figure 10 is a 3D illustration showing the spectrum analysis versus time. Here, the time axis extends from the bottom to the left, and the frequency increases downward from the right. The expected tooth engagement frequency is 160 Hz. This cannot be readily seen from Figure 10 at first glance.

[0021] In contrast, Figure 11 shows the machining / sensor data of a tool holder. In this case, it is also a bottom milling cutter with a tooth number z = 4. In this case, it is a biaxial acceleration sensor with two orthogonal measurement axes (x, y) oriented in the radial direction (32). The two (measurement / measurement axis) signals x, y or their (measurement) data are combined to form the result R xy in accordance with the rule. R(x i ) = Sqr(Sum(x i 2 )) (1) Here, x i measurement axis signal of axis i Sqr square root Sum total

[0022] The machining parameters are also n = 2400 revolutions per minute, a p (depth of cut) = 2 mm, and a e (working engagement) = 4 mm.

[0023] Figure 11 also shows a 3D illustration showing the spectrum analysis versus time. Here, the time axis also extends from the bottom to the left, and the frequency also increases downward from the right. The expected tooth engagement frequency is also 160 Hz, and this time it can be clearly identified as the dominant frequency in Figure 11 (shown by ZEF).

[0024] In a certain evolutionary form, the accelerometer may be designed in various ways. For example, in one evolutionary form, the accelerometer may be specified to have (exactly) two measuring axes that are orthogonal to each other.

[0025] In the case of a hollow shaft cone, it may be advantageous for at least two measuring axes, oriented substantially radially with respect to the tool holder rotation axis (D), to be aligned with the tool holder's orientation function, such as an index notch or driver. Therefore, with sufficiently fast communication from the machine control unit, it may be possible to assign rotation angles, ideally in real time. Thus, a form of phasor representation of vibration in machine coordinates may be possible.

[0026] In another development, the acceleration sensor may have three measuring axes in a Cartesian coordinate system, in this case in particular, the third measuring axis may be oriented substantially axially with respect to the tool holder rotation axis (D).

[0027] If the result (R) of the measurement axis signal (or measurement axis data) is calculated, for example, by an evaluation unit, such as a microprocessor / microcontroller, or during condition monitoring (CM), or in a condition monitoring system (CMS), this can be done according to the following rules. R(x i )=Sqr(Sum(x i 2 )) (1) Here, x i Measurement axis signal of axis i Sqr square root Sum (Especially in the case of non-orthogonal sensors, (1) is also a vector).

[0028] Other mathematical operations can be considered to calculate results from the measured axis signals / data.

[0029] A third measurement axis or its signal may be evaluated separately at the discretion of the user. Here, it is already known from cutting force tests using multi-element dynamometers that the axial signal shows considerable fluctuations when instability is present.

[0030] Furthermore, it is advantageous if the tool holder has additional electronic components, particularly a microcontroller, one or more transmission devices, particularly one or more antennas, one or more circuit boards, and / or one or more energy supply units.

[0031] Furthermore, it may be specified that the acceleration sensor is located on a separate circuit board, particularly on a circuit board different from the microcontroller. In this way, a more flexible arrangement of components can be achieved, even as an advantageous modular structural system (flexibly interchangeable) within the tool holder.

[0032] Here, the circuit board containing the microcontroller may be configured as a flexible circuit board, which in turn allows for a more convenient mounting position for the tool holder.

[0033] One or more transmission devices or antennas may also be arranged on one or more separate circuit boards.

[0034] Therefore, such a distributed arrangement allows for an advantageous modular structure within the tool holder, which is easily replaceable.

[0035] For convenience, the antenna may be an SMD (surface mount device) antenna, a wire antenna, or a self-adhesive foil antenna. Here, it may also be specified that the SMD antenna or wire antenna be placed on separate circuit boards (modular structure / modular system).

[0036] Furthermore, it may also be specified that the transmission device, in particular the antenna and / or energy supply unit, is recessed in a recess on the outer surface of the tool holder. Contrary to prior academic knowledge, it has been found that a suitable antenna, even consisting of a recess within a metallic enclosure, exhibits even greater transmission power.

[0037] Such recesses may be formed as circular, preferably cylindrical, pockets on the outer surface of the tool holder as a convenient and technically feasible solution, and in particular, the recesses may be potted and / or covered using a silicone compound. It has also been found that these shapes of pockets have a favorable effect on the transmission characteristics of the antenna.

[0038] In one developmental form, two or more transmission devices, in particular two or more antennas, in particular wire antennas, are provided, and they are arranged to be distributed circumferentially around the tool holder rotation axis (D). For example, if one of the two or more antennas is located in the transmission shadow, the other antennas can transmit data (redundantly). Thus, continuous data transmission can be ensured.

[0039] Furthermore, it may also be specified that one or more connection holes run diagonally with respect to the tool holder rotation axis (D), in particular connection holes for accelerometer or antenna connection wires run diagonally with respect to the tool holder rotation axis (D). In this regard, diagonal holes provided by cable guides help avoid cable kinks, thus resulting in a more fail-safe system.

[0040] In one developmental form, the accelerometer uses SPI or I 2 Having a C interface, and / or having SPI or I- 2 C interface and / or SPI or I 2It is also specified that it may have a C bus. In short, in this method, it is preferable that values / data / signals are transmitted via an SPI interface. The SPI interface or SPI bus is, for example, I 2 Enabling higher data speeds than the C interface.

[0041] The accelerometer may also have an analog output.

[0042] Here, the SPI interface proved advantageous as a communication path between the sensor and the microcontroller. It allows for sufficiently high data rates and can also be used for communication with other electronic components.

[0043] Furthermore, it can also be advantageous that energy supply is achieved, in particular, by kinetic energy extraction, and that coolant flow within the tool holder is used to generate energy, especially by a turbine in the coolant channel within the tool holder.

[0044] Alternatively, or in addition to the above, energy supply can be provided by batteries and / or storage batteries. When storage batteries are used, they may be provided as replaceable storage batteries, or alternatively, they may be rechargeable in the installed state. In the latter case, corresponding contacts are provided on the tool holder (not shown). As a specific variation of storage battery, in this case, it would also be possible to use so-called supercapacitors (supercapacitors or ultracapacitors). These have the advantage of being able to charge much faster than ordinary storage batteries and, furthermore, being able to withstand a much larger number of charging cycles.

[0045] It is particularly advantageous when the acceleration sensor is located within or near the tool holder rotation axis (D). The positioning of the acceleration sensor is based on the base load a zpThe centripetal acceleration is affected by the square of the rotational speed n, and therefore, the distance of the acceleration sensor from the tool holder rotation axis (D) must be kept as small as possible for monitoring at high rotational speeds. Thus, the measurement range of the acceleration sensor is limited only slightly. The rotational speed-dependent effect on the measurement results is as follows: base load a zp The amplitude shift due to the magnitude is reflected in both the time signal and the frequency spectrum. This must be observed when vibration intensity is considered for evaluation. Furthermore, the measured maximum value does not correspond to the stimulus caused by the processing, but is only useful after the shift has been reduced.

[0046] With proper calibration of the measurement system, the base load a zp Through this analysis, it is even possible to identify the eccentricity of the tool clamped to the machine's spindle.

[0047] In one developmental form, the tool receiving configuration is specified to be a shrink chuck, a hydraulic expansion chuck, a face mill arbor, a collet chuck, or a power chuck.

[0048] The connecting configuration may be, for example, a hollow shaft cone or a steeply tapered shaft, and / or an engagement configuration for a ball-shaped clamp system or a polygonal hollow shaft, or may include such configurations.

[0049] In particular, it is advantageous when a machine tool is equipped with a tool holder according to the present invention, or a tool holder developed as described above. Therefore, it is possible to monitor the process on the machine tool.

[0050] The above description of the present invention and the above description of the advantageous structure of the present invention include a number of features, which are shown individually and, in some cases, together in combination in individual (primary / dependent) claims. However, these features may also be considered individually for the tool holder and / or combined to form further meaningful combinations for convenience.

[0051] Even if some terms are used in the description or claims either singular or with a number in each case, the scope of the invention is not intended to be limited to the singular or the respective number with respect to those terms. Furthermore, the words "a" or "an" should be understood as indefinite articles, not numbers.

[0052] The above-mentioned characteristics, features, and advantages of the present invention, as well as the methods by which they are realized, will become more apparent and clearer with the following description of exemplary embodiments of the present invention, which will be discussed in more detail with the drawings / figures (identical parts / components and functions are indicated by the same reference symbols in the drawings / figures).

[0053] The exemplary embodiments are helpful in describing the invention and do not limit the invention to combinations of features, including the functional features expressed therein. Furthermore, for this purpose, preferred features of each exemplary embodiment may be explicitly considered on their own, removed from one exemplary embodiment, introduced into another exemplary embodiment to complement another exemplary embodiment, and combined with any one of the claims. [Brief explanation of the drawing]

[0054] [Figure 1] A tool holder having a clamp chuck (in this case, a shrink chuck) according to one embodiment is shown. [Figure 2] A portion of the tool holder shown in Figure 1, which includes a battery compartment and an antenna pocket, is shown. [Figure 3] Figure 1 shows a diagram of the tool holder along with the position of the (flexible) main board. [Figure 4] The (flexible) main board has protective foil on the front and rear sides and includes a sensor connection section, a microcontroller (μC), and an antenna connection section for the tool holder as shown in Figure 1. [Figure 5]Figure 1 shows a (flexible) main board for a tool holder, having sensor connections (plug contacts), a microcontroller (μC), an antenna connection, programming contacts, and an energy supply connection (plug contacts). [Figure 6] Figure 1 shows a diagram of the tool holder along with the position of the sensor. [Figure 7] A sensor board is shown, which has a sensor and wiring for a tool holder as shown in Figure 1. [Figure 8] The image shows a sensor board with sensors and a (flexible) main board wired for the tool holder shown in Figure 1. [Figure 9] A tool holder having a clamp chuck (in this case, a shrink chuck) according to a further embodiment having a two-wire antenna is shown. [Figure 10] This shows machining / sensor data from a tool holder equipped with a single-axis accelerometer. [Figure 11] This shows machining / sensor data of the tool holder according to the present invention, obtained using a two-axis acceleration sensor having two radial measuring axes. [Modes for carrying out the invention]

[0055] Status monitoring by a tool holder equipped with sensors. - Tool holder 1 with sensor device (Figures 1-8) Figure 1 shows a first embodiment of the tool holder 1 according to the present invention, and hereinafter it will be simply referred to as tool holder 1 or first tool holder 1.

[0056] The tool holder 1 comprises a tool holder body 35, which will be referred to simply as the body 35 below. To achieve the highest possible rigidity, the body 35 is in a one-piece form in this case. The body is manufactured from metal in a conventional manner.

[0057] In the context of the present invention, an integral structure exists even when the components are produced in an additional process, for example, from metal powder, or when they are assembled from multiple components in an inseparable manner, for example, by welding or brazing.

[0058] Hereinafter simply referred to as the rotation axis D, the tool holder 1 extending along the rotation axis D (in the axial direction 31) has a tool portion 3 at its tool-side longitudinal end 2 and a connecting portion 6 at its opposite connecting-side longitudinal end 5.

[0059] The tool section 3 includes a tool receiving configuration 4 in the form of a tool receiving recess 4. The shaft of a tool (not shown in Figure 1) can be inserted axially 31 into the tool receiving recess 4 from the longitudinal end 2 on the tool side.

[0060] The tool section 3 of the tool holder 1 is designed as a shrink chuck in a manner known to itself, and the shaft of the tool (not shown in Figure 1) can be clamped by utilizing the thermal expansion and contraction of the material of the body.

[0061] In the example of the tool holder 1 shown in Figure 1, the connecting portion 6 is equipped with a connecting configuration 7 in the form of a hollow shaft cone, abbreviated as HSC (hollow shaft cone).

[0062] As can be seen from further exemplary embodiments not shown, the tool section 3 may be designed according to some other clamping principle, such as the principle of a hydraulic expansion chuck. Separately, the coupling section 6 may be configured with some other shaft design.

[0063] An operating configuration 36 for operating the tool holder 1 by, for example, a gripper device may be provided in the axial direction 31 between the tool portion 3 and the connecting portion 6. As shown in Figure 1, the operating configuration 36 may include a gripper groove 37 surrounding the rotation axis D in the circumferential direction 21.

[0064] In the example shown in Figure 1, the central recess 38 penetrates completely through the main body 35 in the axial direction 31, and the tool receiving recess 4 of the central recess 38 forms an axial portion that can be used to supply a coolant, in particular, through the tool holder 1 to the machining position, where the tool (not shown), clamped to the tool holder 1, is engaged with the workpiece to be machined, for example, a milling tool, to be milled.

[0065] During workpiece machining, a measuring device 8 is provided on the tool holder 1 to monitor its operation.

[0066] The measuring instrument 8 can also identify abnormal conditions in the tool holder 1, such as tool breakage / wear, vibration, or other instability, such as chatter. For this purpose, the signals / data from the measuring instrument are analyzed and evaluated / processed.

[0067] For this purpose, the measuring instrument 8 provides various components such as an acceleration sensor 9, an SMD antenna 11, a microcontroller (μC) 10, and a voltage / energy supply unit or battery 16 (see Figures 2-8 in particular), which are arranged on the tool holder 1 and connected to each other (via cables), and these components are typically arranged on separate boards 12, 13, 14, 15, such as a main board 14 having a microcontroller (μC) 10, a (sensor) board 13 having an acceleration sensor 9, and a (antenna) board 15 having an SMD antenna 11, on a modular structure, which are typically connected to each other via connecting wires / cables 23 (not shown), 24, 25, as described below.

[0068] - 2-axis accelerometer 9 The main component of the measuring device 8 is, in this case, a two-axis acceleration sensor 9, as shown in Figures 6-8, with its two measuring axes x and y arranged orthogonally to each other.

[0069] To implement it in a modular manner and keep it separate from other components of the measuring instrument 8, the acceleration sensor 9 is arranged on different (sensor) boards 13 (see Figures 7 and 8).

[0070] To minimize the effect of centrifugal force on the acceleration sensor 9 resulting from the rotation of the tool holder 1, the acceleration sensor 9 is positioned on the center point / rotation axis D of the tool holder 1, as shown in particular in Figure 6, with the measuring axes x and y (which are orthogonal to each other) oriented perpendicular to the rotation axis D (and measuring radial (32) acceleration in the axial directions x and y) (see Figure 6).

[0071] A three-axis accelerometer may be used instead of this two-axis accelerometer 9, in which case its three measuring axes x, y, and z are in a Cartesian coordinate system, and its third measuring axis z is oriented in the axial direction 31 with respect to the tool holder rotation axis (D) (not shown).

[0072] The (sensor) board 13 is bonded to a housing 39, which can be screwed into the tool holder 1 in place of the coolant pipe, as also shown in Figure 6. The acceleration sensor 9 is directly bonded to the housing 39 with super glue.

[0073] The connection between the (sensor) board 13 and the main board 14 is implemented in a wired manner, as can be seen particularly in Figures 8 and 7 (connection wire 23 for the accelerometer 9, and plug connector 40 for plug contacts 26 for the connection wire 23). The corresponding plug contacts 26 are provided on the main board 14 for this purpose, i.e., for the plug connector 40. It is also possible to provide a wireless connection between the components instead of a wired connection.

[0074] - Main board 14 having a microcontroller (μC) 10 For the integration of the main board 14, which has a microcontroller (μC) 10, into the tool holder 1, a circular or ring-shaped groove 33 concentric with respect to the axis of rotation D is formed in the tool holder 1, as shown in Figure 3, and the groove 33 runs around the central recess 38 of the tool holder 1 (not shown here for the accelerometer) or the area of ​​the coolant pipe.

[0075] The ring-shaped groove 33 is closed with a screwable cover 34, as shown in Figure 2, which is advantageous because this area is part of the HSC interface for removing the tool holder 1 from the spindle.

[0076] Similar to the (sensor) board 13 of the sensor housing 39, the main board 14 is potted with a silicone protective coating after all components are placed in the ring-shaped groove 33 (19).

[0077] As shown in Figures 3-5, the main board 14 is designed as a flexible "strip" because it offers significant advantages, particularly with respect to the installation process. The flexible board can be adjusted to the shape of a circular groove 33 with little effort (see also Figures 3 and 4), making it easier to handle / install than a rigid deformed form during the connection of various connecting wires / cables 23, 24 (not shown), 25.

[0078] Figure 5 shows a plan view of the main board 14 to be mounted (without connecting wires / cables 23, 24, and 25 (see Figure 8)). Figure 5 shows the top view of the main board 14 with all components mounted. Only the conductor tracks are present on the rear side of the main board 14.

[0079] All connecting wires / cables 23, 24 (not shown), 25, such as the connecting wire / cable (23) for the acceleration sensor 9, the connecting wire / cable (25) for the energy supply unit 16, and the connecting wire / cable (24 (not shown)) for the antenna 11, are implemented by plug contacts 26, 27, 28, which are advantageous for easy and flexible installation.

[0080] As shown in Figure 5, the connecting plug contact 26 for the connecting wire 23 or the plug connector 40 for the acceleration sensor 9 is located at the left end of the main board 14. The (free) contact 29 located below may be used for further sensor signals if appropriate.

[0081] The microcontroller (μC) 10, which has various components, is located slightly to the left of the center of the main board 14, as shown in Figure 5, and the microcontroller reads signals / data from the accelerometer 9.

[0082] The signal / data is read from the accelerometer 9 via SPI, providing values ​​for two measurement axes, specifically x and y.

[0083] If more than one value is needed at a given point in time, all values ​​must be transmitted in a single read operation. After the read operation is complete, the values ​​from the accelerometer 9 are discarded, and subsequent values ​​are loaded for the next read operation.

[0084] The accelerometer 9 transmits data in byte units, with each individual value consisting of two bytes. Furthermore, the accelerometer 9 first transmits the "suffix" of the entire value, followed by the "prefix," which must then be combined by the software of the microcontroller (μC) 10. The data is then combined by the microcontroller (μC) 10 and ready for transmission.

[0085] As shown in Figure 5, to the right of the center of the main board 14, there are two devices for antenna connection, namely plug contacts. In the case of the first tool holder 1, one (in this case, the upper plug contact 27) is used for the SMD antenna 11, which transmits signals / data to an external location outside the tool holder 1, for example, to the CMS (by Bluetooth transmission).

[0086] As shown in Figure 5, in the case of the main board 14, a large number of programming contacts 30 can be seen further to the right, and at the right edge of the main board 14, a connection or plug contact 28 for the voltage / energy supply unit 16 can be seen.

[0087] To protect the components of the main board 14, the front and rear sides of the main board 14 may have protective foil 42 that is adhesively bonded thereto, as shown in Figure 4, if appropriate.

[0088] - SMD antenna 11 The SMD antenna 11, positioned on a separate antenna board 15 (see Figure 2), is attached to the tool holder 1 via a circular pocket 17 on the gripper collar 43, as shown in Figures 1 and 2. The circular pocket connects to a circular groove 33 that receives the main board 14 via angled connection / connection holes 22 (for the connection wires 24 (not shown)) which are eccentric to prevent kinking of the connection wires 24 (not shown).

[0089] Where appropriate, a second identical circular pocket (17) located on the opposite side may be formed in the gripper collar (43) to first improve the quality of balance of the tool holder 1, and second to enable the realization of other antenna concepts with two antennas (11) (and, optionally, to improve the transmitted power as a result) (in this case, see Figure 9 or tool holder 1 according to the second embodiment having a two-wire antenna 11). For this purpose, a second antenna connection (in this case, an additional plug contact 27) is already provided on the main board 14 (see above).

[0090] To secure the antenna board 15 to the circular pocket 17, the antenna board may be potted (19) (or instead covered) with silicone, or the same silicone protective coating 19 used for the main board 14 may be used.

[0091] - Energy supply unit / battery 16 The energy / voltage source 16 or battery 16 is mounted via an additional circular pocket 17 (battery compartment 45) on the gripper collar 43, similar to the SMD antenna 11, as shown in Figures 1 and 2, and the additional circular pocket is similarly connected to a circular groove 33 that receives the main board 14 via angled connection holes 22 (for the connection wires 25) which are eccentric to prevent kinking of the connection wires 25.

[0092] The battery 16 is secured to the battery compartment 45 by a screw-on cover 20 (see Figure 1), which can be screwed onto the battery compartment 45, closing the battery compartment 45 and simultaneously creating contact with the battery 16. The cover 20 also allows for external replacement of the battery 16.

[0093] Where appropriate, a seal (not shown) may also be provided in the battery compartment 45 to protect the battery compartment from the ingress of liquid (not shown).

[0094] - Tool holder 1 with sensor device (Figure 9) Figure 9 shows a further embodiment of the tool holder 1 according to the present invention, which is abbreviated simply as the second tool holder 1.

[0095] This further or second tool holder 1 differs from the tool holder according to the first embodiment, i.e., the first tool holder 1 (see Figures 1-8), in that it simply provides a different type of antenna 11.

[0096] Aside from this, the second tool holder 1 provides the acceleration sensor 9, as in the first embodiment, and also provides all the other components. However, the other components are described in relation to the first tool holder 1, although they will not be discussed in more detail below. A more detailed description of this can be found in the description of the first tool holder 1.

[0097] Compared to the first embodiment (where the SMD antenna 11 is installed in a circular pocket 17 on the outer circumference 21 of the first tool holder 1 (see Figure 2)), the second tool holder 1 provides two-wire antennas 11 that are uniformly distributed on the outer circumference 21 of the second tool holder 1, when each is similarly recessed in the circular pocket 17, as shown in Figure 9. Each of the wire antennas is also connected via a connecting wire / cable to an antenna connection / plug contact 27 located on or on the main board.

[0098] Furthermore, the circular pocket 17 on the outer circumference 21 of the tool holder 1 that receives the two-wire antenna 11 may also be potted with silicone (19) (or covered instead).

[0099] While the present invention has been described in further detail using preferred exemplary embodiments, the invention is not limited to the disclosed examples, and other modifications can be derived therefrom without departing from the scope of protection of the invention. [Explanation of symbols]

[0100] List of reference symbols 1 Tool holder 2 (First, tool side) Axial longitudinal end 3. Tool Section 4. Tool receiving configuration, tool receiving recess 5 (Second, connecting side) Axial longitudinal end 6 Connecting part 7. Linked configuration 8 Measuring equipment 9 (Accelerometer) Sensor 10 Microcontrollers (μC) 11. Transmission devices, antennas, SMD antennas, wire antennas 12 circuit boards, boards 13 (Sensor) Board 14 Mainboard 15 (Antenna) Board 16. Energy supply unit, voltage source, battery 17. Recess, circular pocket 18 Exterior 19. Resins and silicone compounds for implantation. 20 Lids, covers (for battery compartment) 21 (of the tool holder (1)) in the circumferential direction, and also the outer circumference 22 connection holes, connection holes 23. Connection wire (for acceleration sensor) 24. Connecting wires (for transmission device) 25. Connection wires (for energy supply section) 26 Plug contacts for connection wires (for accelerometer) 27 Plug contacts for connecting wires (for transmission devices) 28 Plug contacts for connecting wires (for energy supply section) 29 Free plug contacts 30 Programming Connections 31 Axis 32 Radial direction 33 Annular / ring-shaped grooves 34 Cover (for ring-shaped grooves) 35 (Tool holder) main body 36 Operational configuration 37 Gripper grooves 38 Central recess 39 Housing (for sensor board 13) 40 Plug connectors (for plug contacts for connection wires (for acceleration sensors)) 41 Plug connector (for plug contacts for connecting wires (for energy supply section)) 42 protective films 43 Grippa Color 45 Battery compartments D Tool holder rotation axis, rotation axis x measurement axis y measurement axis z measurement axis ZEF Center Firmness Frequency

Claims

1. Tool holder (1), The tool holder (1) is designed to rotate around a tool holder rotation axis (D) that defines an axial direction (31), and has a tool section (3) with a tool receiving configuration (4) for receiving a tool at one axial longitudinal end (2), and a connecting section (6) with a connecting configuration (7) for transmitting torque from the spindle of a machine tool at the other axial longitudinal end (5), and has a measuring instrument (8) for acquiring data on the operation of the tool holder (1), The measuring instrument (8) is an acceleration sensor (9) positioned on a rotation axis (D) passing through the center point of the tool holder, and has at least two measuring axes (x, y), the two measuring axes (x, y) are oriented radially with respect to the rotation axis (D) of the tool holder (32). Tool holder (1).

2. The acceleration sensor (9) has three measurement axes (x, y, z) spanning a Cartesian coordinate system, One of the three measuring axes (x, y, z) is oriented axially with respect to the tool holder rotation axis (D). The tool holder (1) according to claim 1.

3. The system comprises a microcontroller (10), one or more transmission devices (11) or one or more antennas (11), one or more circuit boards (12, 13, 14, 15), and one or more energy supply units (16). The tool holder (1) according to claim 1 or 2.

4. comprising a plurality of acceleration sensors (9), wherein each of the plurality of acceleration sensors (9) is located on a separate circuit board (13), and is located on a circuit board (13) different from the circuit board (14) having the microcontroller (10), The circuit board (14) having the microcontroller (10) is configured as a flexible circuit board (14), and / or, The system comprises a plurality of the aforementioned transmission devices (11) or antennas (11), each of which is arranged on a separate circuit board (15). The tool holder (1) according to claim 3.

5. The antenna (11) is an SMD (surface mount device) antenna (11) or a wire antenna (11), and the system comprises a plurality of the SMD (surface mount device) antennas (11) or wire antennas (11), and each of the SMD (surface mount device) antennas (11) or wire antennas (11) is arranged on a separate circuit board (15), Or, The antenna (11) is a self-adhesive foil antenna. The tool holder (1) according to claim 3 or 4.

6. A transmission device (11) or an antenna (11), and / or an energy supply unit (16) is recessed in a recess (17) on the outer surface (18) of the tool holder (1), and the recess (17) is potted using a silicone compound (19) or covered with a silicone compound (19) (20). A tool holder (1) according to any one of claims 1 to 5.

7. Two or more wire antennas (11) are arranged to be distributed in the circumferential direction (21) around the tool holder rotation axis (D). Having, A tool holder (1) according to any one of claims 1 to 6.

8. The connection holes (22) for the connection wires (23, 24) of the acceleration sensor (9) or antenna (11) run diagonally with respect to the tool holder rotation axis (D), A tool holder (1) according to any one of claims 1 to 7.

9. The acceleration sensor (9) has an SPI interface and / or, The microcontroller (10) of the tool holder has an SPI interface and / or an SPI bus. A tool holder (1) according to any one of claims 1 to 8.

10. The energy supply unit (16) generates energy by extracting kinetic energy from a turbine in a coolant channel within the tool holder (1), which is driven by the coolant flow within the tool holder (1), and is used to supply energy to the measuring instrument (8). A tool holder (1) according to any one of claims 1 to 9.

11. The tool receiving configuration (4) is a shrink chuck, a hydraulic expansion chuck, a face mill arbor, a collet chuck, or a power chuck. A tool holder (1) according to any one of claims 1 to 10.

12. The connecting configuration (7) comprises a hollow shaft cone, or a steeply tapered shaft, and / or an engagement configuration for a ball-shaped clamp system or a polygonal hollow shaft. A tool holder (1) according to any one of claims 1 to 11.

13. A machine tool having a tool holder (1) according to any one of claims 1 to 12.

Images