Method for operating a machine tool, and machine tool
Patent Information
- Application Number
- EP2023711704
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-03-21
- Filing Date
- 2023-03-13
- Publication Date
- 2025-01-29
AI Technical Summary
Operators of complex machine tools like panel saws often struggle to set optimal parameters efficiently, as they lack awareness of available options and material-dependent settings, leading to suboptimal machine performance and ergonomic issues.
A method that automatically determines current machine settings and suggests alternative parameters based on production situations, using data tables to enhance performance, while allowing operators to decide on expert knowledge whether to implement these suggestions.
Improves machine tool efficiency by providing intelligent suggestions for optimal parameter settings, enabling operators to enhance performance without being overwhelmed by control complexities, and allows for user-specific profiles and machine modifications for better utilization.
Smart Images
Figure 1.1
Abstract
Description
[0001] Title : Method for operating a machine tool , and machine tool
[0002] Description
[0003] The invention relates to a method for operating a machine tool and to a machine tool according to the preambles of the independent claims.
[0004] DE 10 2020 115 462 A1 describes a machine tool in the form of a panel dividing saw. This machine can be used to divide large-format panel-shaped workpieces into strip-shaped semi-finished products by longitudinal cuts and then further cut into finished workpieces by cross-cuts and, if necessary, further cuts. These finished workpieces can be used, for example, in furniture production.
[0005] Panel dividing saws are complex machine tools with a multitude of setting options (“operating parameters”). For the efficient operation of the
[0006] To ensure machine tool quality and reliability, it is crucial that the machine tool and its parameters are set correctly and that the existing functions of the machine tool and machine control system are used optimally. However, depending on the production situation, the correct setting of the machine tool is often not obvious to the operator and therefore requires expert knowledge. Operators are often not familiar with all the available options on their machine, and therefore the machine tool cannot be used with maximum efficiency.
[0007] Typically, the manufacturing steps required for a workpiece or machining program are specified using so-called "recipes". The recipe contains the necessary manufacturing steps, but no further settings that are needed for greater efficiency. Another known method is to set up the machine tool using material-dependent parameters. This technology automatically makes machine settings depending on the material to be machined. This means that settings can be automated. However, settings that are "only most of the time" correct or that depend heavily on the current production context cannot be implemented in this way. In addition, material-dependent parameters must also be set, which means that the operator must know the options and correct settings.Machine settings that can influence the ergonomic process or contain material-specific processes are usually not taken into account in the machining program.
[0008] The object of the present invention is to improve the operation of a machine tool.
[0009] This object is achieved by a method for operating a machine tool and by a machine tool having the features of the respective independent claims.
[0010] According to the invention, intelligent improvement suggestions for optimal use of the machine tool and its options are made to the operator based on the respective production situation, and the operator is enabled to easily apply these improvement suggestions to the current production situation. At the same time, the operator is not "disempowered" by the machine tool's control system, but can decide, based on their existing expert knowledge, whether the improvement suggestion actually makes sense or not.
[0011] Specifically, a procedure for operating a
[0012] Machine tool, in particular a panel cutting system, is proposed. The panel cutting system can preferably be a panel cutting saw, with which large-format panel-shaped starting workpieces are divided into finished workpieces by longitudinal cuts and cross cuts and, if necessary, further cuts, which are used, for example, in furniture production. Such a panel cutting saw typically comprises an infeed table, a machine table, an unloading table, a sawing device and at least one feed device for moving the workpieces relative to the sawing device or a sawing line defined by the movement of the sawing device.
[0013] The method according to the invention initially includes, in a step a, the automatic determination of a currently set value of at least one first operating parameter of the machine tool. Typically, the value has previously been set either by an automatic control system (machine control system) based on recorded, determined, and / or predefined parameters, or has been manually entered by the operator, for example, based on individual experience ("expert knowledge").
[0014] The method according to the invention further includes, as step b, an automatic determination of a currently intended production situation of the machine tool. The term "production situation" is to be understood rather broadly in the present context and can be any type of parameter or descriptive criterion that numerically or alphanumerically characterizes or describes the current machining process as a whole or as such, and is to be understood less as a purely numerical value of an individual operating parameter. The term "currently intended" means that the production situation should not necessarily already exist now, but in the future, i.e. for a production process planned for the future.
[0015] In the method according to the invention, in a step c, the information determined in steps a and b is further automatically processed by means of a data table, which data table links values of the first operating parameter of the machine tool and / or values of a second operating parameter of the machine tool for the currently intended production situation with at least one performance parameter. The term “data table” also includes a database with values, logical links, exclusion criteria and / or rule sets. The data table therefore contains data records which can contain numerical data and / or alphanumeric data. The result of the processing is a performance parameter which characterizes the anticipated performance of the machine tool for the intended production situation and the determined value of the first operating parameter.
[0016] Furthermore, the method according to the invention comprises, in a step d, an attempt to automatically determine, by means of a data table, at least one alternative value of the first operating parameter of the machine tool or a value of a second operating parameter of the machine tool which, in the currently intended production situation, leads to a value of the performance parameter which is higher than the value of the performance parameter in the current production situation with the currently set value of the first operating parameter of the machine tool. A better machine setting is therefore sought than the one currently selected. It is understood that there are situations in which there is no more favorable value of the first or a second operating parameter than the values already set. In this case, the current settings are already optimal.In this respect, the method according to the invention merely "attempts" to determine a more favorable value, which, however, does not succeed in every case.
[0017] The two data tables are created in advance. In addition to the actual numeric or alphanumeric values, at least the latter data table may also contain explanatory information, for example, informing the operator of the particular advantages of the proposed value. This information may also include, in particular, the name of the operating parameter and a description of its meaning.
[0018] Finally, in a step e, the determined alternative value of the first operating parameter of the machine tool or the determined value of the second
[0019] The machine tool's operating parameters are automatically output to a person. This is, of course, only possible if a more favorable value was actually found in the previous step. If this is not the case, nothing is output, for example, or the person is explicitly informed that the most favorable settings are already available.
[0020] Through automatic output to a person, such as an operator, shift supervisor, or other responsible specialist, they can use their expert knowledge to independently decide whether the suggested value—i.e., the suggested machine settings—make sense for the current production situation. If the person decides this is the case, they can accept the suggested value by entering it on an input device (keyboard, touchscreen, microphone, etc.).
[0021] Alternatively, the person can reject the suggestion or "put the suggested value on hold" so that the next time, with more operational experience, they can decide again whether or not to use the alternative value. The output can be made directly at the machine tool or away from it, for example in the office of a production manager, etc.
[0022] In a further development, it is provided that the first operating parameter of the machine tool or the second operating parameter of the machine tool is a parameter from the following group: desired or actual operating state of a subsystem of the machine tool; desired or actual arrangement of at least one workpiece to be machined. The subsystem can be a specific detection device whose measured values are used to control and / or regulate the machine tool, or also, for example, a drive or other assembly. In the case of a panel dividing saw, the subsystem can specifically and for example be a so-called "light sensor" with which a cutting length of the current workpiece can be determined. If this is activated, the movement of a sawing device can be limited to the cutting length of the current workpiece; if, on the other hand, it is not activated, the saw must be moved over the maximum possible travel distance during a cut.Activating the light sensor increases performance, as the machine tool can saw faster thanks to material detection. However, deactivating it can make sense if a workpiece is to be machined whose surface cannot be detected with the light sensor. This might be the case, for example, if the workpiece surface is black.
[0023] The subsystem can also be, for example, an operator assistance system that gives the person visual or acoustic instructions about actions to be performed. The subsystem can also be, for example, a height measuring device for a pressure beam that automatically controls or regulates a pressure beam that is usually present in the area of a sawing line in panel dividing systems. In a panel dividing saw, the arrangement of the workpiece can specifically and for example be the arrangement of two workpieces next to each other or on top of each other, or it can lead to the processing of two workpieces one after the other or simultaneously.
[0024] Another example of a relevant subsystem is an air supply for an air cushion table, for example a blower, which can be activated in certain operating situations and deactivated in others. Furthermore, a relevant subsystem can be an automatic angle pressure device, which can be deactivated, for example, during a production process involving manual handling of the workpiece. The term "subsystem" can be expanded in this context to include the consideration / non-consideration of certain parameter groups. For example, the operator can deliberately activate or deactivate the use of material-dependent parameters for machine control.Furthermore, the term "subsystem" can be extended to include the switching state of certain software-based subprocesses, for example whether a cutting plan optimization or a destacking optimization is switched on or off. Another subsystem can be a separately movable collet chuck. Depending on its switching state, a re-sorting of the parts within a cutting plan or across cutting plans can be carried out. As already mentioned above, the subsystem can also be a drive, and the operating parameters can characterize its operating state, current power, current speed, or simply the switching state.
[0025] In a further development it is envisaged that the production situation is at least one from the following group: machining a workpiece with specific workpiece properties; machining a workpiece with a specific tool; machining a workpiece in a specific relative direction; machining a workpiece for a specific purpose. The workpiece properties can include, for example, a type of workpiece surface, for example a black surface as mentioned above, or a particularly pressure-sensitive surface. Specific tools can play a role, for example, when the machine tool can be operated with different types of tools, for example with both a milling tool and a drilling tool.The relative direction can be an important defining criterion for the production situation, especially in the case of a panel dividing saw, since it defines the longitudinal cuts to produce panel strips from an initial workpiece and the cross-cuts to produce workpieces from the panel strips. The processing purpose can also define the production situation: for example, in the case of a panel dividing saw, it can be important whether the saw unit is used to make a separating cut, a trimming cut, or a grooving cut. The desired production quality can also be counted as part of the specific processing purpose, for example, whether it is a finished cut or a rough cut.
[0026] In further training it is intended that the performance parameter is one from the following group: processing speed, for example cycle speed, but also speed of a rotating tool, or the number of parts to be produced per shift, etc., even if these come from a higher-level system, for example a "factory control"; processing quality, for example quality of a cutting edge, quality of a workpiece surface, but also the number of rejected workpieces; safety, for example the safety of a person and the safety of the machine tool with regard to damage; handling, for example the force or the distance that a person has to apply or cover to manually manipulate the workpiece; material waste, in particular the amount of material waste or the utilization of an initial workpiece to produce finished workpieces.
[0027] During further training, it is planned that the person’s acceptance of the alternative values of the first operating parameter of the machine tool given to the person or of the determined values of the second operating parameter of the machine tool is evaluated. For example, the machine tool can regularly send anonymized data about its use and the person’s actual acceptance of the information given to the person to a central server (although the evaluation is generally also possible on the machine tool itself). The data collected there can then be evaluated by algorithms and / or human specialists, for example also historically, in order to generate further suggestions and / or to check how often the suggestions are accepted by the person. The data obtained can be further used in anonymized form, for example for marketing, development and product management.Unused or rarely used functions that can improve the performance of the machine tool can also be identified.
[0028] In a further development of this approach, the data table (mentioned second) is adjusted based on the evaluation. This allows the suggestion system to be refined and adapted so that alternative values acceptable to the person are more frequently identified in step d above.
[0029] In the case of further training, the evaluation is intended to determine possible modifications to the machine tool that enable higher performance parameters. The customer can therefore be provided with suggestions or offers for modifications to the machine tool through hardware or the activation of pre-prepared options that enable the customer to increase the performance of their machine tool.
[0030] In a further development, it is planned that in step d, the alternative value is determined depending on a predefined priority parameter. The priority parameters can generally be the same as the performance parameters specified above. In this way, specific preferences of the person and / or customer can be taken into account.
[0031] In one further development, the alternative value determined in step d and output in step e is assigned to a specific person or a specific user or customer, and in particular that the alternative value is set automatically when the specific person or user is recognized. This also allows individual preferences of the person and / or customer to be taken into account and served even better. The last two further developments allow what are essentially "user-specific application profiles" with prioritized or learned settings to be available and used. "User-specific" can refer here both to the individual person and to the customer as a whole.
[0032] The invention is explained below by way of example. The drawing shows: Figure 1 a schematic plan view of a machine tool in the form of a panel dividing saw; and
[0033] Figure 2 is a flow chart explaining a method for operating the machine tool of Figure 1.
[0034] A machine tool in the form of a panel dividing saw bears the reference numeral 10 in Figure 1. It comprises a saw, which is not shown in Figure 1, however. Only the sawing line is indicated by a dash-dotted line with the reference numeral 12. The saw can move lengthwise to the sawing line 12 for a cutting process. Above the sawing line 12 there is a pressure beam 14, and below this a machine table 15 in which there is a sawing slot (not shown) through which a saw blade of the saw can protrude upwards above the plane of the machine table 15 at least temporarily.
[0035] The machine tool 10 also includes a feed table 16, which is formed, for example, by a plurality of rollers (not shown). In the initial configuration of the machine tool 10 shown in Figure 1, a plate-shaped workpiece 18 lies on the feed table 16. This can be moved by a first feed device 20, also referred to as a program slide, in the feed direction (arrow 22) and also against the feed direction 22 by being gripped by first gripping devices 24 in the form of pneumatic collets. These are attached to a first carrier 26 that is motor-driven and movable in the feed direction 22.
[0036] The machine tool 10 further comprises a second feed device 28, which, in the rest position shown in Figure 1, is arranged very close to the sawing line 12. The second feed device 28 comprises a second carrier 30 in the form of a movable carriage, to which a second gripping device 32, again in the form of a pneumatic collet, for example, is attached laterally, towards the feed table 16. In the bottom of Figure 1, a removal table 34 consisting of four segments adjoins the machine table 15.
[0037] The machine tool 10 also includes a processing device 36. This can be, for example, a computer. The processing device 36 comprises at least one processor 38 and at least one memory 40. Program code stored in the memory 40 can be executed on the processor 38. The program code is programmed such that the processing device 36 automatically controls a method, which will be explained further below with reference to Figure 2.
[0038] The processing device 36 also includes a
[0039] Output device 42 for outputting information to a person, for example, to an operator of the machine tool 10. For example, the output device 42 may comprise a screen, a loudspeaker, a laser projector, a light bar, or the like. Furthermore, the processing device 36 also includes an input device 44, for example, in the form of a keyboard, a touchscreen, a microphone, etc.
[0040] During operation of the machine tool or panel dividing saw 10, panel-shaped starting workpieces 18 can be positioned relative to the saw line 12 by the first feed device 20 and sawn into panel strips by the saw (longitudinal cuts). The panel strips are then rotated by 90° and reinserted onto the feed table 16 such that they are positioned relative to the saw line 12 either only by the first feed device 20 or only by the second feed device 28 and successively divided into workpieces (cross-cuts).
[0041] It is also possible, however, for two adjacent panel strips to lie on the feed table 16, with one panel strip being gripped by the first feed device 20 and an adjacent panel strip being gripped by the second feed device 28. The two feed devices 20 and 28 then position the respective panel strips differently relative to the sawing line 12, as the case may be, so that they can be divided differently by a single cut (cross-section) of the saw. It is possible for individual workpieces and panel strips to be sawn, but it is also possible for stacked workpieces or...
[0042] Panel strips are sawn.
[0043] The method for operating the machine tool 10 of Figure 2, already briefly mentioned, will now be explained in more detail. The method begins in a function block 46. In a block 48, two variables are processed, namely a currently set value of a first operating parameter of the machine tool 10, and a currently intended production situation of the machine tool 10. The currently set value of the first operating parameter is determined in a function block 50, and the current production situation in a function block 52. The two function blocks 50 and 52 receive corresponding data from a machine control 54.
[0044] The aforementioned first operating parameter of the machine tool 10 can be a parameter from the following group: the desired or actual operating state of a subsystem of the machine tool 10; the desired or actual arrangement of at least one workpiece 18 to be machined. The subsystem can be a specific detection device whose measured values are used to control and / or regulate the machine tool 10. In the panel dividing saw 10 presented here, the subsystem can be, specifically and by way of example, a so-called "light sensor," with which a cutting length, for example of the current workpiece 18, can be determined.If this light sensor (not shown in Figure 1) is activated, the movement of the saw along the saw line 12 can be limited to the cutting length (corresponding to the width of the workpiece 18); if, on the other hand, it is not activated, the saw must be moved over the maximum possible travel path (more or less the total length of the saw line 12) during a cut.
[0045] The subsystem can also be, for example, an operator assistance system which gives the person visual or acoustic instructions about actions to be carried out, for example by means of the output device 42. The subsystem can also be, for example, a height measuring device of the pressure beam 14, which automatically controls or regulates the lowering of the pressure beam 14 onto the workpiece arranged in the area of the sawing line 12 both as pre-positioning and for the actual machining process. In the present panel dividing saw 10, the arrangement of the workpiece can specifically and for example be the arrangement of two workpieces next to one another or on top of one another, or it can lead to the machining of two workpieces one after the other or simultaneously, as was mentioned above as an example in connection with the first feed device 20 and the second feed device 28.
[0046] In general terms, the subsystem can be a configurable assembly, for example the position of a movable receiving table or the height of a stacking table, etc., or a configurable software module. The production situation determined in function block 52 can be at least one from the following group: machining a workpiece with specific workpiece properties; machining a workpiece with a specific tool; machining a workpiece in a specific relative direction; machining a workpiece for a specific purpose. The workpiece properties can include, for example, a type of workpiece surface. For example, the workpiece can have a colored, in particular black, surface, or the workpiece or material of the workpiece can be particularly pressure-sensitive, so that the clamping pressure must be adjusted accordingly, for example by the pressure bar 14 mentioned above.Specific tools may be required for a design not shown here.
[0047] This can play a role in the design if the machine tool can be operated with different types of tools, for example with a milling tool and with a drilling tool.
[0048] The relative direction can be an important defining criterion for the production situation, especially in the case of the panel dividing saw 10 in question, since it defines the execution of the aforementioned longitudinal cuts for producing panel strips from the initial workpiece 18 and the execution of the aforementioned cross-cuts for producing (finished) workpieces from the panel strips. The processing purpose can also define the production situation: for example, in the case of the panel dividing saw 10 in question, it can be important whether a separating cut, a trimming cut, or a grooving cut is made with the saw unit.
[0049] The automatic processing in function block 48 is carried out using a data table provided in a function block 56, which links values of the first operating parameter of the machine tool 10 for the currently intended production situation with at least one performance parameter. This data table 56 was created in advance in a function block 58, for example, under laboratory conditions. It contains, for example, a plurality of data sets for each possible production situation, consisting of the two data items "first operating parameter" and "performance parameter."
[0050] The performance parameter can be one of the following group : processing speed , for example cycle speed , in the case of the panel dividing saw 10 in question but also for example the speed of the rotating saw blade or a feed speed of a saw carriage on which the saw blade is arranged ; processing quality , for example the quality of a cutting edge produced by a sawing process on a panel strip or a finished workpiece or the quality of a workpiece surface , but also the number of reject workpieces after the sawing processes have been carried out ; safety , for example the safety of the
[0051] Person of the machine tool 10 and the safety of the
[0052] Machine tool 10 from damage; handling, for example the force or the distance that the person has to apply or travel to manually manipulate a workpiece (for example the plate strip for the 90° rotation and reinsertion into the feed devices 20 and 28); material waste, in particular the amount of material waste or the utilization of the starting workpiece 18 for producing finished workpieces. An example of some columns and rows of such
[0053] For example, a data table could look like this: where panel_type_l workpieces with a first
[0054] Workpiece property and panel_type_2 denote workpieces with a second workpiece property, assist_of f and assist_on denote the switch-on state of an optical assistance system, RPM1 and RPM2 denote the respective rotational speeds of a sawing tool, sens_on and sens_of f denote the switch-on state of a detection device, for example a length measuring system, and LI to L8 denote different values of performance parameters, in this case a processing speed.
[0055] The result of the processing in function block 48 is the provision of an estimated value of the performance parameter in function block 60 .
[0056] In a function block 62, an attempt is now made to determine, by means of a (second) data table provided in a function block 64, an alternative value for the first operating parameter of the machine tool 10 or a value of a second operating parameter of the machine tool 10, which in the currently intended production situation (function block 52) leads to an anticipated value of the performance parameter that is higher than the anticipated value of the performance parameter provided in the function block 60 in the currently intended production situation with the currently set value of the first operating parameter of the machine tool 10.
[0057] The data table provided in function block 66 has in turn been generated in advance, for example in the laboratory (function block 66). The data table provided in function block 64 can in turn contain value pairs, value triplets or value quadruples, etc., for a large number of possible production situations, which link at least the two data items "first operating parameter" and "performance parameter" with one another. Preferably, however, further information is also contained in the data set, which contains, for example, the type of the first operating parameter, the type of performance parameter, as well as further information that is useful for the person operating the machine tool 10.
[0058] A corresponding alternative value for the first operating parameter is provided in function block 68. Prioritization specified in function block 70 also plays a role, since the alternative value is determined depending on a priority parameter specified in function block 70. The priority parameters can, in principle, be the same as the performance parameters listed above.
[0059] In function block 72 it can be determined that the current settings are already optimal, i.e. no alternative value for the first operating parameter that would improve the performance parameter could be found. In a function block 74, on the other hand, it can be determined that the current settings are not optimal, i.e. an alternative value for the first operating parameter that is more favorable for performance has been found. In a function block 76 a corresponding output is sent to the person, for example by means of the output device 42. The person is therefore informed as to whether an alternative and more favorable value could be found and, if so, which operating parameter it is and which is the better value.The person can also be informed at this point about the type of performance improvement of the machine tool 10 that can be achieved by using the alternative value of the first operating parameter (or the second operating parameter). The extent of the expected performance improvement can also be given as an example.
[0060] In a function block 78, the person can, for example, indicate via the input device 44 whether or not they accept the suggestion offered in function block 76. If they accept the suggestion, the machine control (function block 54) is adjusted accordingly. The identity of the person is known to the machine control 54 (function block 80). This allows the accepted alternative value of the first operating parameter to be assigned to the person in a function block 82, so that the machine control can be automatically and automatically adjusted accordingly in advance for future production situations involving this person.
[0061] The input in function block 78 by the person can be evaluated in a function block 84. For example, the machine tool 10 can regularly send anonymized data about its use and the acceptance of the instructions given to the person to a central server (not shown) (although in principle the evaluation is also possible on the machine tool itself). The data collected there can then be evaluated by algorithms and / or human specialists in order to generate further suggestions and / or to check how often the suggestions are accepted by the operator. The data obtained can be reused in anonymized form, for example for marketing, development and product management. Unused or rarely used functions which can improve the performance of the machine tool can also be identified. An adaptation of the data table in function block 64 is also possible in this way.
[0062] Based on the evaluation in function block 84, possible modifications of the machine tool 10 that enable higher performance parameters can also be determined in a function block 86. Thus, the customer can be provided with suggestions or offers for possible modifications of the machine tool 10 through hardware or the activation of pre-defined options that enable the customer to increase the performance of the machine tool 10.
[0063] The process ends in a block 88 .
Claims
Claims: A method for operating a machine tool (10), in particular a panel saw, characterized in that it comprises the following steps: a. Automatically determining a currently set value of at least one first operating parameter of the machine tool (10); b. Automatically determining a currently intended production situation of the machine tool (10); c. Automatically processing the information determined in steps a and b by means of a data table, which links values of the first operating parameter of the machine tool (10) and / or values of a second operating parameter of the machine tool (10) for the currently intended production situation with at least one performance parameter; d.Attempts to automatically determine, using a data table, at least one alternative value of the first operating parameter of the machine tool (10) or a value of a second operating parameter of the machine tool (10), which in the currently intended production situation leads to a value of one. Performance parameter leads to a value higher than the value of the performance parameter in the currently intended production situation with the currently set value of the first operating parameter of the machine tool (10); e.g., if a value could be determined in step d: Automatic output of the determined alternative value of the first operating parameter of the machine tool (10) or the determined value of the second operating parameter of the machine tool (10) to a person.
2. Method according to claim 1, characterized in that the first operating parameter of the machine tool (10) or the second operating parameter of the machine tool (10) is a parameter from the following group: target or actual operating state of a subsystem of the machine tool (10); target or actual arrangement of at least one workpiece to be machined (18) .
3. Method according to at least one of the preceding claims, characterized in that the production situation is at least one from the following group: machining a workpiece (18) with specific workpiece properties; machining a workpiece (18) with a specific tool; machining a workpiece (18) in a specific relative direction; machining a workpiece (18) for a specific purpose.
4. Method according to at least one of the preceding claims, characterized in that the performance parameter is one of the following group: processing speed; processing quality; safety; handling; material waste.
5. Method according to at least one of the preceding claims, characterized in that an acceptance of the alternative values of the first operating parameter of the machine tool (10) issued to the person or of the determined values of the second operating parameter of the machine tool (10) is evaluated.
6. Method according to claim 5, characterized in that the data table is adapted on the basis of the evaluation.
7. Method according to at least one of claims 5 or 6, characterized in that modifications to the machine tool (10) which enable a higher performance parameter are determined on the basis of the evaluation.
8. Method according to at least one of the preceding claims, characterized in that in step d the alternative value is determined depending on a predetermined priority parameter.
9. Method according to at least one of the preceding claims, characterized in that the alternative determined in step d and output in step e A value is assigned to a specific person or user, and in particular, the alternative value is automatically set when the specific person or user is recognized. A method according to at least one of the preceding claims, characterized in that the automatic output in step e takes place directly at the machine tool (10) or at a location remote from it, for example, in a room located remote from the machine tool (10). A machine tool (10) for automatically machining a workpiece (18) with a tool, comprising a processing unit (36) with a processor (38) and a memory (40), wherein program code can run on the processor (38), characterized in that the processing unit (36) is programmed to execute a method of the preceding claims.