MACHINE TOOL SYSTEM WITH AUTOMATIC BALANCING PROTOCOL ANALYSIS

Abstract

machine tool system (1) with a machine tool (2) comprising a spindle (3) which can be driven in a rotary manner for the purpose of machining workpieces, with several tools in the form of so-called chucks (5) each clamped in a chuck.Tool heads (4) that can be coupled to the spindle (3), and with a balancing device (8) for balancing the tool heads (4), characterized in that the machine tool system (1) comprises a data storage device (11) in which the corresponding balancing protocol is stored for each of the system-associated tool heads (4), and comprises a controller (12) that reads balancing data from the balancing protocol for a tool head (4) to be coupled to the spindle (3) and compares it with one or more parameters of the machining operation for which this tool head (4) is intended, or compares it with at least one general balancing parameter, wherein the machine tool system (1) is preferably designed in such a way that it rejects a tool head (4) if no balancing data is available for this tool head (4).

Description

[0001] The invention relates to a machine tool system according to the preamble of claim 1, as well as an associated machine tool according to claim 9, a complementary method according to claim 13 and a corresponding use according to claim 14. TECHNICAL BACKGROUND

[0002] Machine tools for machining are nowadays typically equipped with tools referred to below as "tool heads," which consist of a tool chuck or chuck with the cutting tool fixed within it, e.g., in the form of a roughing end mill. Such a tool head may also include additional components, such as a spray system for delivering a coolant jet to the cutting edges of the tool.

[0003] For quick and precise tool changes, the current tool head is simply uncoupled from the spindle of the machine tool. Then, a different tool head, in the form of a chuck, is attached, holding the cutting tool required for the next machining step, for example, a finishing end mill.

[0004] The assembly of a cutting tool with a tool holder and any other components, such as a coolant tube, a drawbar, or a modular extension, invariably results in a tool head that exhibits a certain degree of imbalance. Once the tool head is coupled to the spindle and rotates, this more than negligible imbalance causes vibrations that impair the quality of the machining process and, in the near-resonance range, can even destroy the spindle.

[0005] Therefore, tool heads of the type in question are ideally balanced after assembly or before initial use.

[0006] However, balancing is complex and can be overlooked or deliberately omitted, even though a warning sticker is usually affixed to the machine spindle.

[0007] Even with balanced tool heads, there is a risk that the last balancing process was some time ago and the current balance state is unknown. In this context, it should be considered that the balance state can change during operation, for example, due to wear-related material removal or chipping on the cutting edges of the cutting tool, and / or because the cutting tool migrates in the tool holder due to vibration or brief overloading, even if the migration amounts are often small. As a result, unexpected imbalances can occur during operation or after repeated use of the tool heads.

[0008] Modern machine tools therefore have vibration monitoring via sensors in the area of ​​the spindle, usually in the form of accelerometers.

[0009] These devices measure the actual vibrations occurring and stop processing if the vibrations exceed a maximum permissible limit.

[0010] Naturally, such a stop can only occur once machining has already begun. However, stopping machining means downtime and outages for the machine, as the cause of the vibrations must first be found and eliminated. This results in high costs and delays.

[0011] In machines without vibration monitoring, vibrations can cause damage to the workpiece and machine without warning.

[0012] DE 196 41 494 A1 describes a machine for machining workpieces. DE 10 2006 008 395 A1 describes a rotating tool with an electronic data carrier. DE 10 2015 220 533 A1 describes a tool holder with integrated sensors. DE 20 2006 019 339 U1 describes a measuring device for a machine tool for monitoring imbalance. DE 698 04 817 T2 describes a device for presetting and balancing a tool holder. EP 0 132 528 B1 relates to a tool or tool holder, in particular for machining on numerically controlled machining centers. EP 1 746 530 A1 describes a device for tool and aggregate identification. WO 2015 / 036519 A1 concerns a machine tool, specifically a gear grinding machine. The company brochure TOOL DYNAMIC from Haimer GmbH, 02 / 2015, describes a modular balancing system. THE TASK UNDERLYING THE INVENTION

[0013] In view of this, the invention aims to create a system in which the imbalance properties of a tool head can be reliably taken into account early on and, if possible, at a time that is before the next start of work of the tool head. THE INVENTIONAL SOLUTION

[0014] This problem is solved using the features of the first main claim.

[0015] Accordingly, a machine tool system is proposed with a machine tool that includes (at least) a main spindle or spindle that can be driven in a rotating manner for the purpose of machining workpieces.

[0016] The machine tool system includes several tools, each clamped in a chuck; these are called tool heads. The tool heads form an interface – usually standardized – with the machine spindle. They can be coupled to the spindle, typically by means of automatic tool changers.

[0017] The machine tool system according to the invention further includes a balancing device or balancing machine for balancing the tool heads. In some cases, the balancing device can be integrated directly into the machine tool, but it will usually be a separate balancing machine that is networked or communicates with the machine tool. The balancing device is physically designed to be able to output or store at least one balancing data point or points determined during the balancing process for further processing.

[0018] It goes without saying that the balancing device does not necessarily have to be located in close proximity to the machine tool and / or connected to it for data transmission. The balancing process or the determination of the balancing data can also be carried out externally by a service provider or supplier.

[0019] The machine tool system also includes a data storage device installed ready for use according to the invention. This device stores the balancing data for each of the system-associated tool heads – i.e., the tool heads currently intended for use on the system-associated machine tool – as a balancing protocol.

[0020] Preferably, the machine tool system also has a (usually additional) memory in which balancing data from previously used tool heads is stored, e.g., in the form of a log file. This makes it possible, for example, to draw conclusions about the cause of damage in the spindle area after the fact.

[0021] In its broader sense, the term "balance data" in this description and the following claims refers to only a single "balance data" in each instance. The term "balance data" thus also stands for the singular. However, the term "balance data" is preferably understood in its narrower sense and then refers to at least two different data points of a tool head.

[0022] Finally, the machine tool system includes a controller pre-installed and ready for operation according to the invention. This controller reads the corresponding balancing protocol for a tool head to be coupled to the spindle. It then compares the readout with the parameter(s) of the upcoming machining operation for which this tool head is intended.

[0023] In this way, before the selected tool head begins its next use cycle, it can be automatically checked whether the tool head can be used as planned and whether any action needs to be taken. Alternatively, the status can be visualized during machining using a "balance indicator" or a warning signal can be sent.

[0024] This typically means that the controller checks whether the tool head in question is suitable for the intended machining operation in light of the balancing data stored in its balancing report. If a lack of suitability is detected, the tool head is rejected as unsuitable – for example, because its documented balancing state does not match the intended operating speed, or a warning is displayed.

[0025] Unlike similar methods, the stated goal of the invention is not merely to document the isolated condition of a tool. Rather, it aims to create a way to extend the service life of both the tool and, in particular, the spindle through logging and comparison. Considering the forces acting on a spindle during machining when connected to an unbalanced or insufficiently balanced tool head, it quickly becomes clear why monitoring the balance extends the spindle's service life and reduces the risk of failure. For the first time, this enables not only monitoring of the tool and the workpiece, but also gentler use of the spindle. For example, monitoring the balance prevents bearing damage, thereby approximately doubling the spindle's service life.It is therefore essential for the invention that a machine tool system is considered as a whole.

[0026] In certain cases, the controller may also limit itself to comparing the balancing data with at least one general balancing parameter. Such a comparison is performed, for example, when the machine tool system is to be used for general measurements not related to a specific subsequent machining operation, such as classifying tools according to whether their imbalance is greater or less than a certain limit value.

[0027] Unlike similar methods, the invention explicitly offers the option of not merely documenting the isolated condition of a tool. Rather, it aims to create a way to extend the service life of both the tool and, in particular, the spindle through logging and comparison. Considering the forces acting on a spindle during machining when connected to an unbalanced or insufficiently balanced tool head, it quickly becomes clear why monitoring the balance condition extends the spindle's service life and reduces the risk of failure. For the first time, this enables not only monitoring of the tool and workpiece but also gentler use of the spindle. For example, monitoring the balance condition prevents bearing damage, thereby approximately doubling the spindle's service life.It is therefore essential for the invention that a machine tool system is considered as a whole. PREFERRED DESIGN OPTIONS FOR THE INVENTION

[0028] It is particularly preferred if the controller or the machine tool is equipped ready for use in such a way that one or more parameters for the intended machining operation can be automatically adapted to the balancing data documented in the balancing protocol for the relevant tool head.

[0029] This means that the controller checks the extent to which the tool head in question is suitable for the (next) planned machining operation, based on the balancing data stored in its balancing report. If unsuitability is detected, one or more parameters are adjusted for the upcoming machining operation, for example, by reducing the spindle speed and / or influencing the feed rate. This is done to ensure that the upcoming working conditions match the documented balancing state, which must be accepted at this stage to avoid a stop and subsequent replacement of the tool head.

[0030] In this way, unnecessary machine downtime is avoided, because a slower, incremental work progress is generally preferable to a temporary complete machine shutdown, even if work could be carried out more quickly after restarting.

[0031] In this and the following context, "ready for use" means that the machine is ready for operation in such a way that no reprogramming or intervention in the software or control system is required that is inaccessible to the regular machine operator. Instead, the relevant function is permanently activated, or it can be activated by the regular machine operator via a menu, a predefined key combination, or by inserting a dongle or similar device.

[0032] Alternatively or additionally, the controller or machine tool can be configured for automatic optimization. Such optimization is relevant if the balancing report documents that the currently used tool head is not balanced with sufficient accuracy, necessitating, for example, the automatic adjustment of a lower spindle speed than originally intended. This ensures a continued stable workflow and thus allows for individual optimization of the machine cycle time. For the optimization of a particularly preferred embodiment, this data can also be supplemented with cutting parameters or machining data of the tool, or displayed separately.

[0033] It is particularly advantageous if the controller or machine tool is configured for use in such a way that the tool head, preferably before it is coupled to the spindle, is exceptionally released for further use, even if its balancing data does not match the parameters of the machining operation for which this tool head is intended. This special release is documented, preferably in the balancing report for the tool head in question and / or in the machine tool's log file.

[0034] Such an upgrade has the significant advantage of preventing downtime even when the tool head is not actually suitable for the planned operating conditions, but the machine cycle time is fixed due to its integration with other systems. This means the reduced performance of the tool head cannot simply be compensated for by slowing down, for example, by reducing the spindle speed. In this case, taking the consequences into account, an automatic decision can be made to use the tool head under suboptimal conditions as an exception. The optional logging of this fact can, for example, ensure that the tool head is replaced at the next opportunity, even if the cutting tool has not yet reached its scheduled replacement period. Furthermore, in certain circumstances,It may only be discovered much later, when damage to the machine tool or its spindle occurs, whether the tool heads used always met the required balancing specifications.

[0035] Alternatively, operation is possible using only a balancing indicator light including documentation, where the status (green for balanced; red for unbalanced, yellow for unknown) is stored.

[0036] It is particularly advantageous if the machine tool belonging to the system is itself capable of making at least certain determinations regarding the balancing properties of the tool head – namely, determinations that allow a check of whether the balancing data found in the original balancing report is still valid. Such determinations can be made, for example, by measuring vibrations on the machine tool. As soon as elevated values ​​are detected, this indicates that the tool head must be removed and at least re-reported or rebalanced.

[0037] The balancing protocol preferably documents one, preferably several and ideally all or at least all but two of the following balancing data: • Date of the last balancing procedure, • Specification of the permissible rotational speed, • Specification of the existing static imbalance, with or without specification of the tool mass, • Specification of the existing dynamic imbalance, e.g. as a combination of static imbalance and moment imbalance, with or without specification of the tool mass, • Specification of balancing quality according to ISO 21940, • Quotient of tool mass and existing residual imbalance, • balanced / unbalanced, • Balance condition good / bad. • Specification of the milling / machining parameters of the tool used

[0038] Advantageously, the system is ready for use in such a way that the controller of the machine tool system compares the balancing protocol or its balancing data with the parameters of the machining operation when the relevant tool head is inserted into a magazine assigned to the machine tool.

[0039] This allows tool heads that are unsuitable for the specific application to be identified and rejected at an early stage.

[0040] Ideally, the system is ready for use in such a way that the controller of the machine tool system compares the balancing data of the balancing protocol with the parameters of the machining operation only or, preferably, also before changing a tool head from the magazine into the spindle during the ongoing machining process.

[0041] This allows the control density and therefore the reliability to be increased even further. AN ADDITIONAL ASPECT OF THE INVENTION

[0042] Furthermore, the invention is based on the objective of creating a machine tool for realizing the previously described machine tool system according to the invention. THE SOLUTION THAT IS INVENTIVE

[0043] To solve this further problem, a machine tool is provided which is characterized by being equipped ready for communication with a controller and for reading a balancing protocol of the type described above. This generally means that it is equipped for "plug and play" operation. For this purpose, the corresponding routines are already implemented in its control system software, so that the machine tool can be operated according to the invention after appropriate wiring or networking.

[0044] In a preferred embodiment, the machine tool includes the controller as a physically integral component.

[0045] In a preferred embodiment, the machine tool includes the memory for the balancing protocol as a physically integral component. THE PROCEDURAL ASPECT OF INVENTION

[0046] Finally, the invention also has the secondary objective of providing a method that allows the imbalance properties of a tool head to be taken into account at a time that is before the next start of work of the tool head. THE SOLUTION THAT IS INVENTIVE

[0047] The solution consists of a method for reducing imbalance-related quality losses in machining workpieces by means of a machine tool system comprising a machine tool which includes a spindle that can be rotated for the purpose of machining workpieces, with several tools or tool heads each clamped in chucks, which can be coupled to the spindle, and with a balancing device for balancing the tool heads from chuck and tool, characterized in that a balancing protocol is stored for each tool head, which is read out for a tool head to be coupled to the spindle and compared with the parameters of the machining process for which this tool head is intended. THE USAGE-BASED ASPECT OF THE INVENTION

[0048] Furthermore, the invention has the subordinate objective of specifying a use that allows for machining optimization. THE SOLUTION THAT IS INVENTIVE

[0049] The solution consists of using a balancing protocol, stored and assignable to a specific tool head, which can be read before the tool head is used, to change one or more parameters of a machining operation for which this tool head is intended. MISCELLANEOUS

[0050] In general, it can be concluded that protection is also claimed for a method characterized by the fact that, during each balancing process, information about the current balancing state of the tool head is stored on the tool head itself and / or in a database, whereby when the tool head is inserted into a machine, the balancing state is queried and the result of the query is preferably recorded in a machine-related log file (e.g., the machine's log file), and finally, depending on the balancing state of the tool head, it is used or rejected.

[0051] Further advantages, modes of operation and design possibilities will become apparent from the following description of an exemplary embodiment based on the figures. LIST OF FIGURES The Fig. Figure 1 provides an overview of an embodiment of the machine tool system according to the invention. The Fig. Figure 2 shows a preferred scheme according to which the balancing condition is retrieved and evaluated. EXAMPLE OF EXECUTION

[0052] The Fig. Figure 1 shows an embodiment of the invention.

[0053] The machine tool system 1 according to the invention consists of a machine tool 2, preferably in the form of the milling machine indicated here. The workpiece 14 to be machined is clamped onto this machine tool.

[0054] The machine tool 2 has a main spindle 3. It can also have several main spindles, which is not shown here. A tool head 4 is coupled to the main spindle 3. The tool head 4 is a unit that typically consists of a chuck 5, the cutting tool 6 held in the chuck 5, and any attachments, such as a length adjustment screw or devices for directing a coolant jet to the cutting area.

[0055] In the vast majority of cases, a tool changer 7 is assigned to the machine tool 2, forming a further system component. Its magazine contains various tool heads 4, which are attached to and detached from the main spindle 3 of the machine tool as needed.

[0056] Finally, the machine tool system 1 according to the invention also includes a balancing device or balancing machine 8. A tool head 4 can be inserted into this balancing machine 8.

[0057] The paths taken by the individual tool heads 4 in the present embodiment are illustrated by dashed material flow lines 9. The data flow between the individual components of the machine tool system 1 is illustrated by finely dotted data flow lines 10.

[0058] After assembling a chuck 5 and a cutting tool 6 to form a tool head 4, this tool head 4 is typically fed to the balancing machine 8 for tool measurement or tool presetting. The balancing machine 8 generates a so-called balancing report, regardless of the specific application, the ideal content of which will be discussed in more detail later. If the requirements are known, the balance can also be improved here, i.e., the tool head 4 in question is rebalanced.The balancing protocol can already be evaluated at this point, for example, to determine whether the tool head in question is suitable for use in machine tool 2 in light of the planned machining tasks, or whether it is only suitable for use in machine tool 2 if its balancing condition has been improved, for example by reclamping (repositioning) the cutting tool 6 in the chuck 5 or even by removing material from the chuck 5 or adding material, for example in the form of balancing weights.

[0059] In this embodiment, the final balancing report is transmitted to the data storage device 11, which can be an integral part of the machine tool 2. The balancing report is stored there. Then, the tool head 4 is fed into the magazine of the tool changer 7. It is also worth noting that the machine tool 2 has a controller 12, preferably also integrated into it, which can read and process the balancing report from the data storage device 11.

[0060] During machining, the tool head 4 typically needs to be changed several times so that the machine tool 2 can optimally perform the individual machining steps one after the other. As soon as the machine tool 2 requests a different tool head 4 from the tool changer 7's magazine, the controller 12 reads the corresponding balancing protocol from the data storage 11 and automatically compares its balancing data with the parameter(s) of the subsequent machining operation.

[0061] If it turns out that the initially selected tool head 4 is not suitable because the balancing protocol shows excessively poor balancing data, the tool head 4 is rejected, i.e., it remains in the magazine of the tool changer 7 and is not coupled to the spindle 3 of the machine tool at all.

[0062] Optionally, the controller 12, or the general control system of the machine tool 2, can modify the parameters of the subsequent machining operation and adjust them to ensure consistency between the machining parameters and the balancing data in the balancing protocol, or to perform a corresponding optimization. The machine will then, for example, operate more slowly and / or with a reduced feed rate, or faster, according to modern, software-optimized milling strategies (dry machining), but can still use the originally selected tool head 4.

[0063] In a particularly advantageous embodiment, the spindle 3 of the machine tool 2 is equipped with an additional unbalance measuring system 13. The machine tool can then monitor, throughout the machining process, whether the tool head maintains the balance quality documented in the balancing report prior to machining, or whether there are indications that the balance quality has changed during machining, for example, due to wear or chipping of cutting edges, etc. If such indications of a change in balance quality are found, the controller 12 or the general control system of the machine tool 2 preferably makes an entry in the balancing report and / or in the internal log file of the machine tool. In most cases, such an entry in the balancing report will result in the tool head 4 in question being removed and reworked.However, it may also suffice for the balancing report to indicate the presumably lower balance quality in the future, meaning that tool head 4 can still be used, but only for less demanding machining operations. In any case, the log file thus initially enables an analysis of the relationship between spindle failure and the usage period of unbalanced tools.

[0064] The balance condition can preferably be described, individually or in combination, by the following balance data: It can be described by the calendar date of the last balancing operation. Based on this, empirical data, stored, for example, in controller 12, can be used to determine when the wear limit is typically reached, at which point the tool head 4 can no longer be used and must be removed. The date of the last balancing operation can also be used to define a maximum permissible period that has elapsed since that date. If this period does not exceed this maximum, it can be assumed that the tool's balancing condition still meets the requirements. This is particularly useful if there is a general agreement that the tool heads are always brought to a specific balancing condition during a balancing operation.In this case, it is not necessary to save detailed information about the balancing status in the balancing report.

[0065] The balancing condition can be described by specifying the permissible rotational speed. This information is the simplest way to clearly define the maximum spindle speed at which the tool head 4 in question can be used.

[0066] The balancing condition can also be specified by indicating the existing residual imbalance, such as static imbalance and / or dynamic imbalance, for example, as a combination of static imbalance and moment imbalance, preferably with the additional specification of the tool mass. Particularly preferably, and to save storage space on a data carrier, the balancing condition of the tool can be specified as a numerical value consisting of the quotient between tool mass and existing imbalance. Together with the intended operating speed, which is stored in the controller 12 of the machine tool, the existing balancing quality can be calculated and compared with a target value.

[0067] Of course, the balancing condition can also be indicated solely by specifying the balancing quality. This is particularly possible if a general agreement stipulates that the tool heads must always be balanced for use at a specific rotational speed.

[0068] Of course, as additional information regarding the balancing status, it can also be specified whether balancing has been performed at all, and if necessary, qualitative information can be stored indicating whether the balancing status is good or bad. Furthermore, machining data for the tool can be saved separately.

[0069] Ideally, information from the balancing protocol is entered into one or all of the Fig.The two described steps are retrieved. Ideally, controller 12 first checks whether any information about the balancing status is available. It then queries whether the tool has been balanced and when this last occurred, i.e., whether the last balancing was within a permissible timeframe. Next, the log is queried to determine the maximum permissible rotational speed based on the tool head's balancing status. This is compared to the planned operating speed at which the tool head is to be used. Finally, it checks whether the balancing quality is high enough and whether the actual residual imbalance is less than or equal to the permissible residual imbalance.

[0070] If the test shows that the balancing condition meets the requirements, the tool head is used or visualized with a green status in the control or controller.

[0071] If the inspection reveals that the balance condition does not meet the requirements or is unknown, the tool head will be rejected. Alternatively, special permission to use the tool may be granted, meaning the tool will be used as an exception to avoid interrupting the workflow. This case is expediently logged in a database (e.g., a log file) on a machine-specific basis, or alternatively or additionally visualized with a red status.

[0072] For the sake of completeness, it should be emphasized that housing the data storage device 11 and / or the controller 12 in the machine tool 2 is advantageous, but not mandatory. Cases are also conceivable in which the data storage device 11 and / or the controller 12 are implemented by an independent network component that is only connected to the balancing machine 8 and the machine tool 2 via data transmission. In the less preferred extreme case, "data transmission" also includes the transfer of data using portable data carriers.

[0073] Alternatively, each tool head 4 could also be equipped with its own suitable data storage device in which the balancing protocol is stored and, so to speak, "given" to the tool head. An integrated RFID chip could be one example.

[0074] If no balancing data is stored for the tool head, a warning to check or a yellow visualization is displayed in the control unit or on the controller. REFERENCE MARK LIST 1 machine tool system 2 machine tools 3 Spindle or main spindle 4 Tool head 5 chucks 6 cutting tools 7 tool changers 8 Balancing machine or balancing device 9 Material flow line 10 Data flow line 11 Data storage 12 controllers 13 additional unbalance measuring system on the machine tool 14 workpiece to be machined

Claims

[1] Machine tool system (1) comprising a machine tool (2) comprising a spindle (3) which can be driven to rotate for the purpose of machining workpieces, with several tools in the form of so-called tool heads (4) which are clamped in chucks (5) and which can be coupled to the spindle (3), and with a balancing device (8) for balancing the tool heads (4), characterized by, that the machine tool system (1) comprises a data storage device (11) in which the corresponding balancing protocol is stored for each of the system-associated tool heads (4), and a controller (12) which reads balancing data from the balancing protocol for a tool head (4) to be coupled to the spindle (3) and compares it with one or more parameters of the machining operation for which this tool head (4) is intended, or compares it with at least one general balancing parameter, wherein the machine tool system (1) is preferably designed in such a way that it rejects a tool head (4) if no balancing data is available for this tool head (4). [2] Machine tool system (1) according to claim 1, characterized by , that the controller (12) is designed to adapt one or more parameters for the intended machining operation to the balancing data documented in the balancing protocol for the relevant tool head (4). [3] Machine tool system (1) according to claim 1 or 2, characterized by , that the controller (12) is designed to reject a tool head (4), preferably before it is coupled to the spindle (3), if its balancing data does not match one or more parameters of the machining operation for which this tool head (4) is intended, or if its balancing data is not sufficiently documented to assess whether it matches the parameters of the machining operation for which this tool head (4) is intended. [4] Machine tool system (1) according to claim 1 or 2, characterized by, that the controller (12) is designed in such a way that it exceptionally allows a release for further use of a tool head (4), preferably before it is coupled to the spindle (3), if its balancing data does not match the parameters of the machining operation for which this tool head (4) is intended, wherein the controller (12) documents the special release, preferably in the balancing report for the tool head (4) in question, and preferably visualizes the special release. [5] Machine tool system (1) according to any one of the preceding claims, characterized by , that the machine tool (2) is equipped in such a way that it can continue the balancing protocol. [6] Machine tool system (1) according to any one of the preceding claims, characterized by, that the balancing report documents one, preferably several and ideally at least all but two of the following balancing data: date of the last balancing operation, specification of the permissible speed, specification of the existing residual imbalance, static imbalance with or without specification of the tool mass, dynamic imbalance with or without specification of the tool mass, e.g. as a combination of static imbalance with moment imbalance, balancing quality with or without specification of the tool mass, quotient of tool mass / residual imbalance, machining and milling parameters balanced, not balanced, balancing condition good or bad. [7] Machine tool system (1) according to any one of claims 1 to 6, characterized by , that the controller (12) of the machine tool system (1) compares the balancing data of the balancing protocol during the insertion of the relevant tool head (4) into a magazine assigned to the machine tool (2) with the parameter(s) of the machining operation. [8] Machine tool system (1) according to any one of claims 1 to 6, characterized by , that the controller (12) of the machine tool system (1) compares the balancing data of the balancing protocol only or also before the exchange of a tool head (4) from the magazine during the ongoing machining process with the parameter(s) of the machining operation. [9] Machine tool (2) for use in a machine tool system (1) according to one of the preceding claims, characterized by , that the machine tool (2) is ready for operation to read balancing data from a data storage device (11) for a balancing protocol via a controller (12). [10] Machine tool (2) according to claim 9, characterized by , that the machine tool (2) includes the controller (12) as a physically integral component. [11] Machine tool (2) according to claim 9 or 10, characterized by, that the machine tool (2) includes the data storage (11) for the balancing protocol as a physically integral component. [12] Machine tool system (1) according to any one of the preceding claims, characterized by , that the machine tool system (1) has a device that visualizes deviations from one or more parameters. [13] Method for reducing imbalance-related quality losses in machining workpieces by means of a machine tool system (1) comprising a machine tool (2) comprising a spindle (3) which can be rotated for the purpose of machining workpieces, with several tools (“so-called tool heads” (4)) which are clamped in chucks (5) and which can be coupled to the spindle (3), and with a balancing device (8) for balancing the tools clamped in the chucks (5), characterized by, that a balancing protocol is saved for each tool head (4), the balancing data of which is read out for a tool head (4) to be coupled to the spindle (3) and compared with the parameters of the machining operation for which this tool head (4) is intended. [14] Use of a balancing protocol stored in a way that can be assigned to a specific tool head (4) and read out before the tool head (4) is used to change one or more parameters of a machining operation for which this tool head (4) is intended.

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