DE202017103056U1 - Determination of wear on sawing tools - Google Patents

Abstract

Detection device for determining a state of wear of a sawing tool of a machine tool comprising a data processing unit, characterized in that the data processing unit is designed to
To receive operating data of a drive motor mechanically coupled to a first sawing tool,
to calculate a first wear progress quantity associated with the first sawing tool as a function of at least this operating data; and
to determine from the first wear progress size a first wear state associated with the first saw tool.

Description

The invention relates to a detection device for determining a state of wear of a sawing tool of a machine tool and to a computer-implemented method for determining a state of wear. Furthermore, the invention relates to a machine tool, in particular a sliding table saw with a detection device for determining a state of wear of a sawing tool.

A sawing tool is formed, for example, as an endless belt, as a saw blade of a reciprocating saw or as a circular saw blade and typically has saw teeth with cutting edges on the edge, which produce the cutting action. The sawing tool is moved relative to the workpiece by force. The saw-tipped sawing tool separates workpieces, such as wood, by spanning a narrow kerf. Each sawtooth scrape a thin chip, which is transported in a sawtooth gap from the workpiece. During a machining process, high mechanical forces and temperature influences act, causing the saw teeth to become heavily stressed and dull over time. Due to an uneven load during the machining process, the saw teeth can be worn unevenly.

In general, wear is caused by the high mechanical forces acting on the sawing tool and the high temperatures resulting from these forces. The mechanical and thermal loads are dependent on different parameters, such as the material of the sawing tool, the material of the workpiece, the cutting speed, the cutting pressure or the intervention variables. For example, at low cutting speeds and easily machinable materials mainly mechanical wear occurs. In contrast, at high cutting speeds and difficult-to-cut materials, the causes of wear caused by heat, such as oxidation and diffusion, are at work. During the machining process, several wear mechanisms occur, such as abrasion due to chip-sawing, adhesion, oxidation and diffusion. Furthermore, various mechanical phenomena, such as plastic deformation, surface dislocation or cracks, may occur.

The wear of the sawing tool causes increasing cutting forces and geometry deviations on the workpiece to be machined, such as roughness, shape error or dimensional error. For this reason, the sawing tool must be replaced or sharpened after a certain time depending on a state of wear. Often, the sawing tool is replaced or sharpened only when the wear is so great that the saw teeth must be abraded disproportionately when sharpening. This reduces the overall life of the sawing tool.

The wear manifests itself in various forms or appearances. Often the flank wear and the crater wear occur. The flank wear is the wear of an open surface of the sawing tool and is often checked by a wearer width of the operating staff. The crater wear occurs on the rake surface of the sawing tool and can be controlled by the operator by means of a Kolktiefe. The wear mark width and the indentation depth are often used as service life criteria. Replacement or sharpening of the sawing tool can be initiated by the operator as a result of exceeding the wear mark width or the Kolktiefe.

One problem is that the sawing tool is often not replaced or sharpened in time despite predetermined service life criteria. The cause of too late replacement or sharpening of the sawing tool is, according to the inventors, primarily a too late detection of a critical state of wear of the sawing tool. Frequently, the critical state of wear due to the uneven wear is not readily determinable. In addition, inattentiveness of the operating personnel can lead to a late detection of the critical state of wear of the sawing tool. Furthermore, poorly trained operators often can not determine the state of wear and can not estimate when the critical state of wear is reached.

It is known that the wear, as well as the type of load, the sawing tool on several parameters such as a cutting length, a cutting speed, a temperature of the saw teeth, a cutting pressure, a hardness and a material thickness of the workpiece depends. Due to the large number of parameters which influence the wear of the sawing tool, a simple determination of the state of wear of the sawing work piece or a prediction of the service life of the sawing tool is not possible. In addition, it is often not possible or associated with a great effort to determine the variety of parameters of a machining operation in order to determine from these the state of wear of the sawing tool. Furthermore, the wear can also be unpredictable caused by damage to the sawing tool. For this reason, even trained operators can Determine wear condition not exactly and with certainty.

It is therefore necessary in use to sharpen a sawing tool. Each sharpening process removes material from the sawing tool, so that a sawing tool can not be resharpened after repeated sharpening, but must be replaced. The usability of a saw blade between the initial use of a new sawing tool and the time at which it must be replaced due to a no longer resharpenable wear can be considered as the total cutting work of a sawing tool. The object of the present invention is to provide a solution to increase the overall cutting work of a sawing tool.

• - Betriebsdaten eines mit einem ersten Sägewerkzeug mechanisch gekoppelten Antriebsmotors zu empfangen,
• - in Abhängigkeit von zumindest diesen Betriebsdaten eine dem ersten Sägewerkzeug zugeordnete erste Verschleißfortschrittsgröße zu berechnen und
• - aus der ersten Verschleißfortschrittsgröße einen dem ersten Sägewerkzeug zugeordneten ersten Verschleißzustand zu ermitteln.

According to a first aspect of the present invention, the object mentioned at the outset is achieved by a detection device for determining a state of wear of a sawing tool of a machine tool comprising a data processing unit, wherein the data processing unit is designed to

• To receive operating data of a drive motor mechanically coupled to a first sawing tool,
• to calculate a first wear progress quantity associated with the first sawing tool as a function of at least this operating data; and
• to determine from the first wear progress size a first wear state associated with the first saw tool.

The invention is based on the finding that the time of replacement and sharpening of the sawing tool for the life of the sawing tool is crucial and therefore the state of wear is to be checked in particular continuously. In addition, there are different parameters that affect the closure of the sawing tool, such as an operating time, an idle time, a cut length in particular a depth of cut and a cutting geometry, a cutting speed, a feed rate, a temperature of the saw teeth, a cutting pressure, a hardness and a material thickness (Tensile strength value) of the workpiece. Furthermore, it was recognized that the wear can not be determined from a single parameter. For example, even with a short operating time due to a certain material quality of the workpiece and a high cutting speed high wear can occur. On the other hand, the same situation can result in a very low wear with appropriate material properties of the workpiece. As a result, it has been recognized that in the determination of wear, the consideration of two or more parameters is advantageous and necessary in order to detect the wear progress size and thus the state of wear as accurately as possible. This can be both a late replacement or sharpening and too early - and thus unnecessary - replacement or sharpening can be prevented. By means of the invention it is possible to determine a wear of a sawing tool in a sufficiently reliable manner without individually determining all the parameters of a machining state which influence the state of wear.

Detection devices which are intended to detect a state of wear of the sawing tool must, according to the findings of the inventors, be designed such that they are integrated into a machining operation and monitor the wear state as continuously as possible, also during this machining operation, preferably in real time. Such designed detection devices should ensure the most accurate state of wear detection, without requiring additional steps by the operator. Furthermore, sawing tools or even machine tools, in particular sliding table saws, should be equipped as simply and inexpensively as possible with such a detection device.

Sawing tools are tools or components of a machine tool for sawing wood, natural stone, metal, plastic or other solid materials. The sawing tool consists of a thin, serrated, linear steel plate or a round saw blade that is moved by a force. According to the invention, the detection device is designed to receive operating data of the drive motor. For this purpose, the detection device can be wirelessly connected by means of a signal-technical coupling or wired to the drive motor. By detecting and analyzing the operating data of the drive motor, two or more parameters of a machining operation, which influence the operating data during the machining process, can be indirectly determined. In this way, the determination of a single size makes it possible to determine the wear taking into account several parameters. For example, the following condition-related parameters can be recorded for this: rotor condition, temperature, total vibration as well as the operating information energy consumption, load (energy) and operating hours. Here, the operating data of the drive motor implies at least information about a cutting pressure and a condition of the workpiece, which in particular on a thickness and a Material of the workpiece based. With this operating data of the drive motor, a first approximation to the actual state of wear of the sawing tool can be determined. For this purpose, a wear progress quantity is calculated in a first step as a function of at least this operating data. For example, the wear progress quantity may be calculated after the machining operation and thus describe the wear that has occurred during this machining operation. Alternatively, two or more wear progressions may be determined at certain time intervals during the machining process. Preferably, the time intervals can be chosen so small that an approximately continuous monitoring of the state of wear is made possible. For this purpose, the wear condition is determined by adding the wear progress quantity and the initial wear condition. It should be noted that the more operating data are acquired, the more parameters that have an influence on the operating data can be taken into account and the more accurately the state of wear can be determined. Consequently, the state of wear, in whose determination only a few operating data or parameters were taken into account, is to be considered more critically. Preferably, a comparison value and in particular a tolerance range of this comparison value can be adapted to a number of the operating data or the parameters which are included indirectly in the calculation by the determination of the operating data of the drive motor. In addition, the wear progress size can be calculated, for example, by means of empirical values, for example from a series of experiments, or mathematical models, taking into account the number and type of parameters with corresponding parameters.

Preferably, the data processing unit may be formed as a control unit to control, for example, the sawing tool or particularly preferably the drive motor of the sawing tool in dependence on the determined state of wear. Thus, it may be advantageous, for example, to terminate the machining process when a certain state of wear is reached or to change parameters of the machining process such that the wear progress size is kept as low as possible or the time profile of the wear progress size can be kept constant. As a result, the sawing tool can be controlled in such a way, for example, after reaching a certain state of wear, in particular in the middle of a machining operation, that the wear progress size can be kept as low as possible in order to allow a longer machining time and preferably complete the machining process.

• - als Betriebsdaten eine Betriebslaufzeit und eine Betriebsbeanspruchung zu empfangen,
• - aus der Betriebslaufzeit und der Betriebsbeanspruchung eine Betriebsbeanspruchungszeit zu berechnen, und
• - die Verschleißfortschrittsgröße in Abhängigkeit von zumindest dieser Betriebsbeanspruchungszeit zu berechnen, wobei
  • ◯ die Betriebslaufzeit eine Zeit anzeigt, in der das erste Sägewerkzeug in Betrieb ist,
  • ◯ die Betriebsbeanspruchung anzeigt, dass das erste Sägewerkzeug unter Last in Betrieb ist und
  • ◯ die Betriebsbeanspruchungszeit eine Zeit anzeigt, in der das erste Sägewerkzeug unter Last in Betrieb ist.

In a particularly preferred embodiment of the detection device is provided that the data processing unit is designed to

• receive operating time and operating load as operating data,
• to calculate an operating time from the service life and the service load, and
• to calculate the wear progress quantity as a function of at least this service load time, wherein
  • ◯ the operating time indicates a time in which the first sawing tool is in operation,
  • ◯ the operating load indicates that the first sawing tool is under load and:
  • ◯ the service life indicates a time that the first saw tool is operating under load.

Operating time is understood to be the time in which the sawing tool is driven and consequently the drive motor of the sawing tool is in operation. That is, the running time corresponds to the time before, during and after the machining operation, that is, the time in which a workpiece is machined and the time that the saw tool is driven, although no workpiece is machined. The operating time is therefore equated with the entire duration of the drive motor and can preferably also be determined by detecting the running time of the drive motor. The running time of the driving motor can be detected by detecting operating data of the driving motor and recording a period in which the operating data has been detected. Alternatively, the running time of the drive motor can also be recorded by means of a switch-on and switch-off signal of the drive motor and detection of the period between the switch-on and the switch-off signal. For this purpose, for example, a first time of the switch-on and a second time of the switch-off can be detected and determined by difference the operating time. From the operating time alone, however, the state of wear can not be determined with sufficient accuracy, since wear during idling is very low or negligible. Here, the idling is understood to be the time in which the drive motor of the sawing tool is in operation without a workpiece being machined. The operating stress, however, indicates that the sawing tool is being driven under load. Consequently, the operational stress is to be detected when a workpiece is actually machined. By recording the operating time and detecting the operating stress and in particular the Time at which the operating stress sets in and ends at the same time, a calculation of the service life is possible. As a result, the service life implies the time that the saw tool operates under load, that is, the time that a work piece is actually machined with the saw tool. This operating stress time may represent a life criterion and allows for continuous determination of the wear condition or, if necessary, real-time wear condition detection. The calculation of the wear progress quantity and thus also the determination of the state of wear from at least the operating load time can be extended by taking into account further influencing variables. The determination of the state of wear by detecting the operating stress time is an easy way to detect the state of wear of the sawing tool.

The detection device according to the invention, comprising a data processing unit which is linked with the drive motor by signal technology or by wire, is a cost-effective and structurally simple solution for determining the wear state of the sawing tool. Furthermore, sawing tools or machine tools are easy to upgrade.

According to a further preferred embodiment, it is provided that the data processing unit is designed to receive an engine load of the drive motor as operating data and to calculate the wear progress quantity as a function of at least this engine load. Under the engine load of the drive motor is a value of the operating stress, so a value of the load resulting from the machining of the workpiece to understand. Consequently, the engine load during the service life is to be recorded. For example, a motor current or torque can be detected in order to draw conclusions about the engine load. By determining the wear progress quantity as a function of the engine load, at least one cutting pressure and a condition of the workpiece can be included in the calculation, wherein the workpiece condition and the cutting pressure are based on a thickness and a material of a workpiece. It is particularly preferred to detect and evaluate the engine load regularly or preferably continuously or to evaluate the time course of the detected engine load.

According to a further preferred embodiment, it is provided that the data processing unit is designed to receive a current consumption of the drive motor as operating data and to determine the motor load from the current consumption of the drive motor. Among other things, the operating time can be determined from the current consumption of the drive motor, for example, by a switching on and off of the drive motor or a time interval in which the power is applied, is detected. For this purpose, it may be sufficient that the data processing unit is designed to receive a binary signal of the drive motor, which reflects the switching on or off of the drive motor. Particularly preferably, the data processing device is designed to detect a value of the current consumption preferably regularly or continuously and to evaluate a time profile of the current consumption. By the temporal evaluation on the one hand, the switching on and off of the drive motor and the beginning of an actual machining operation and the changing load during the machining process can be detected. In particular, the changing load reflects the changing state of wear during the machining process. The data processing unit can also be designed to determine a remaining service life of the sawing tool as a function of the changing load during the machining process. Furthermore, abnormalities of the changing load may indicate plastic deformation, surface dislocation or cracks, and cause replacement of the sawing tool. Preferably, the current consumption of an open circuit can be used as a comparison variable. A difference in the current consumption of the idling and a current consumption during the machining process may reflect the engine load.

• - eine Bearbeitungszeit zu ermitteln und/oder
• - einen Materialvorschubparameter, insbesondere eine Vorschubgeschwindigkeit und/oder eine Vorschublänge, zu ermitteln und
• - die Verschleißfortschrittsgröße in Abhängigkeit von zumindest der Bearbeitungszeit und/oder dem Materialvorschubparameter zu berechnen.

A further preferred embodiment of the detection device is characterized in that the data processing unit is signal-technically coupled to a feed sensor which is designed to detect a feed of a workpiece relative to the first sawing tool in a feed direction, the data processing unit being designed to operate as operating data Feed signal of the feed sensor to receive and from this feed signal

• - to determine a processing time and / or
• - To determine a material feed parameter, in particular a feed rate and / or a feed length, and
• calculate the wear progress quantity as a function of at least the processing time and / or the material feed parameter.

Prerequisite for such determination of the processing time and / or the material feed parameter is the feed sensor, which is arranged in a workpiece-related feed direction in front of the sawing tool in the workpiece support surface. Preferably, the feed sensor be arranged flush in the workpiece support surface. Alternatively, the feed sensor can also be arranged in a recess of the workpiece support surface and in particular be covered such that a cover is integrated flush in the workpiece support surface. The feed sensor can also be arranged on the workpiece support surface or arranged such that a part of a sensor unit protrudes from the workpiece support surface, in particular if this is important for the functionality of the feed sensor. Likewise, the feed sensor can also be arranged above the workpiece and sense the sawing process from above, for example as a camera recording the material transport, so that it can be analyzed and evaluated by the data processing unit. Under the workpiece support surface is in particular a substantially horizontally oriented surface to understand, which may be a completely flat surface or auxiliary transport elements, such as air nozzles or rollers and / or fixing auxiliary elements, such as vacuum nozzles, may include. Furthermore, the workpiece-related feed direction in front of the sawing tool in particular has the significance that no cut has yet been made on the workpiece at this point.

Preferably, the feed sensor can be wired or wirelessly connected by means of a signal coupling with the data processing device and configured to detect a deposition of the workpiece on the support surface or a preparation of a workpiece on the sawing tool and a removal of the workpiece from the workpiece support surface. The removal may imply lifting the workpiece from the workpiece support surface and / or advancing the workpiece on the workpiece support surface. If the workpiece is located in the feed direction behind the sawing tool, it is considered to be already removed, ie finished, to be viewed. By arranging the feed sensor immediately in front of the sawing tool, the machining time can be detected by detecting the time in which the workpiece is applied. The processing time determined in this way is an approximation to the actual service life and can also be used instead of the service life to determine the state of wear. Particularly preferably, the sensor can be designed to detect a movement of the workpiece in the feed direction on the workpiece support surface. The detected movement in the form of the material feed parameter may in this case imply the feed rate and / or the feed length or detect the feed rate and / or the feed length individually. Such a trained detection device allows a reliable determination of the state of wear during the machining process. The variables determined in addition to the operating data of the drive motor allow a more accurate determination of the wear. Furthermore, the upgrade of the detection device with the feed sensor is inexpensive and structurally easy to implement.

It is further preferred if the feed sensor is inserted in a workpiece support surface of the machine tool and detects a feed movement of a workpiece moved by the feed sensor, in particular by the feed sensor optically detecting the workpiece or by the feed sensor comprising a mechanical, rotatably mounted scanning element which is connected to the workpiece is in contact and is set by the feed movement in rotation. Such mechanically, rotatably mounted sensing elements may be formed, for example, as rolling balls. In this case, the sensor system can be designed, for example, mechanically-electrically with mechanical contacts or optomechanically. In the optomechanical sensor system, a rolling movement of the trackball can be transferred to two perforated segment discs via two rollers and electric pulses can be generated from their speed via incremental encoders with small light barriers. An optical detection can be implemented by means of a light source. Here, the workpiece is illuminated with the light source and detects the reflection from the workpiece with an optical sensor. For detecting the feed movement of the workpiece, a one-dimensional detection of the feed movement in the feed direction can be sufficient.

• - der Sensorchip ausgebildet ist, um ein von einem Werkstück, welches über dem Vorschubsensor bewegt und von der Lichtquelle beleuchtet wird, reflektiertes Bild zu erfassen und
• - die Recheneinheit ausgebildet ist, um eine Bewegung des Werkstücks mittels einer Bildverarbeitung in Form einer Bildmusterfolge, bestehend aus zwei, drei oder mehreren von dem Sensorchip erfassten Bildern, zu erfassen.

It is further preferred if the feed sensor is an optical sensor, comprising a light source, preferably a light emitting diode or a laser diode, a sensor chip and an arithmetically linked to the sensor chip arithmetic unit and further characterized in that

• - The sensor chip is adapted to detect a of a workpiece, which moves over the feed sensor and illuminated by the light source, reflected image and
• - The arithmetic unit is designed to detect a movement of the workpiece by means of image processing in the form of a picture pattern sequence consisting of two, three or more captured by the sensor chip images.

The optical sensor is preferably arranged in the workpiece support surface and designed to optically detect the material feed. The operation of this optical sensor is based on image processing. For this purpose, the workpiece, which is moved on the workpiece support surface in the feed direction, illuminated by the light source. Furthermore, the sensor chip of the optical sensor, a camera with a lens which is adapted to receive the image reflected by the workpiece. Image information of the reflected image preferably comes as a gray scale image in a digital signal processor of the sensor chip. In the present case, this digital signal processor can correspond to the arithmetic unit of the sensor chip. By recording an image sequence, that is to say several images, preferably immediately after one another, an image pattern sequence can be detected in the digital signal processor and the movement of the workpiece can be determined therefrom. For this purpose, for example, a second recorded image is compared with a first recorded image and first determines a speed and optionally a direction of movement of the workpiece. As an algorithm for calculating the speed, an image correlation may be used. The image correlation algorithms recognize the pattern shifted in the captured image compared to the previously recorded images. Displacements can be calculated precisely from measured pixel coordinates of the pattern. The sampling rates are particularly preferably around 1500 images per second and the computing power of the digital signal processor for determining the motion information is preferably about 18 MIPS.

A light source may be formed of a red light emitting diode or, more preferably, of a blue light emitting diode. A light source formed of a laser diode can more clearly resolve the structures of the workpiece. As a result, the sensor can also be used when machining workpieces with smooth reflective surfaces.

According to a further preferred embodiment variant of the detection device, it is provided that the detection device comprises a memory unit coupled to the data processing unit in which at least one first saw tool profile data record is stored, which first saw tool data associated with at least the first saw tool, in particular preferably a geometrical indication such as a thickness or a Diameter, a material condition of the sawing tool, a purpose of use such as fine cut / coarse cut, an indication of the materials to be cut with the sawing tool and / or the times of previous re-sharpening or a time of the last re-sharpening of the first sawing tool.

The saw tool profile data set may preferably include one, two, several, or all of the sawing tool data that affects the wear of the sawing tool. Particularly preferably, the storage unit can comprise a sawing tool database with sawing tool data of two or more or all sawing tools. This sawing tool database can be part of a tool management to uniformly organize and integrate information about existing sawing tools. The sawing tool data may be stored in the sawing tool database and preferably captured and used with tool management software. In addition, tool management may include technical data fields, graphics, and parameters required for a machining operation.

• - den gespeicherten ersten Verschleißzustand abzurufen,
• - Betriebsdaten des mit dem ersten Sägewerkzeug mechanisch gekoppelten Antriebsmotors zu empfangen,
• - in Abhängigkeit von zumindest diesen Betriebsdaten eine weitere dem ersten Sägewerkzeug zugeordnete Verschleißfortschrittsgröße zu berechnen und
• - aus dem abgerufenen gespeicherten ersten Verschleißzustand und der weiteren ersten Verschleißfortschrittsgröße einen dem ersten Sägewerkzeug zugeordneten aktualisierten ersten Verschleißzustand zu ermitteln.

Furthermore, it is preferred that the data processing unit is designed to store the first state of wear of the first sawing tool in the first sawing tool profile data set, wherein the data processing unit is designed to

• - retrieve the stored first state of wear,
• To receive operating data of the drive motor mechanically coupled to the first sawing tool,
• to calculate, depending on at least this operating data, a further wear progress quantity associated with the first sawing tool, and
• - Determine from the retrieved stored first state of wear and the other first wear progress size associated with the first sawing tool updated first state of wear.

The first state of wear, which corresponds to an initial wear state, that is to say to the determined first state of wear, can be stored after a machining operation. Alternatively, a wear state during the machining process can be temporarily stored, which can then be overwritten with the actual first state of wear of the entire machining process. Preferably, the wear state can be automatically stored when no more operating data is received. Similarly, the stored state of wear can be retrieved as soon as the drive motor is put back into operation and operating data of the drive motor are detected.

An embodiment of the machining operation may be configured such that the sawing tool has reached a given state of wear after the machining process, which requires a replacement and / or a grinding of the sawing tool. Often has a sawing tool However, after a machining operation on a state of wear, which does not require replacement and / or grinding of the sawing tool. As a result, the sawing tool can be used at least for another machining operation. It is particularly advantageous if the storage unit is designed to store the state of wear of a completed machining operation and retrieve it before performing another machining operation. By receiving according to the invention the operating data of the drive motor mechanically coupled to the sawing tool, a further wear progress variable associated with the sawing tool can be calculated at least in dependence on this operating data. This wear progress size corresponds to the wear that occurred during this machining operation. The updated first state of wear therefore corresponds to the sum of the first state of wear and a further state of wear, which was determined from the first state of wear and the further extent of wear progress. This wear condition can then be stored again in the memory unit and made available for retrieval. This embodiment allows monitoring of the state of wear of the sawing tool over several machining operations.

A further preferred embodiment of the detection device is further characterized in that the memory unit comprises a predetermined first reference, which indicates a maximum tolerable state of wear of the first sawing tool and the data processing unit is designed to compare the first state of wear with the predetermined first reference. Such a predetermined reference variable may be generally stored in the memory unit for a specific, two, several or all sawing tools. Alternatively, the predetermined datum may be associated with a particular sawing tool, and preferably deposited in the sawing tool profile dataset. In this embodiment, it is particularly preferable to store a specific predetermined reference value for each sawing tool. This has the particular advantage that the maximum tolerable state of wear is usually not the same for each sawing tool. The maximum tolerable state of wear can be very different in particular when the sawing tools have a different purpose. A sawing tool that is used for very dimensionally accurate machining operations must have very little wear in order to ensure dimensional accuracy. In contrast, a sawing tool, which is used only for separating a certain area, have a very high state of wear. The reference value is to be regarded as a reference value which allows a quantitative statement about the wear of the sawing tool. Thus, an evaluation of the state of wear can thus be made. Depending on this evaluation, a sawing tool can be replaced and / or sharpened or used further. The data processing unit can be designed as a control unit in order to control, for example, the sawing tool or in particular preferably the drive motor of the sawing tool as a function of the evaluation. This control unit can be designed, for example, to switch off the drive motor of the sawing tool when the predetermined reference variables are exceeded.

Furthermore, it is preferred that the memory unit is designed to store a first, second and optionally further saw tool profile data records which are assigned corresponding to a first, second and further sawing tool, and in that the data processing unit is designed to receive a sawing tool identification signal which is a specific one Sawing tool from the first, second and optionally further sawing tools selects, and to calculate a corresponding according to the first, second and optionally further sawing tool wear progress size and state of wear. As a result, sawing tool profile datasets of several sawing tools can be stored and a specific sawing tool profile dataset assigned to a specific sawing tool. This embodiment also makes it possible to monitor the state of wear of the sawing tool despite repeated insertion and removal of the sawing tool.

A further preferred refinement of the detection device is characterized in that the detection device comprises a sawing tool identification unit which is signal-coupled to the data processing unit and which is designed to detect a sawing tool by means of an identification unit which is attached to the sawing tool, wherein the data processing unit is designed, retrieve a saw tool profile data set of a recognized sawing tool from the storage unit and perform the calculation of the state of wear for that sawing tool based on this retrieved saw tool profile data set. This embodiment has the particular advantage that the data processing unit recognizes an inserted sawing tool and assigns it the corresponding sawing tool profile data set. As a result, the corresponding sawing tool data can also be called up. Alternatively, the data processing unit itself may be designed as a sawing tool identification unit.

Furthermore, it is preferred that the sawing tool identification unit comprises an RFID system with a transponder attached to the sawing tool. The RFID system allows automatic and non-contact identification of the sawing tool with radio waves. The RFID system consists of a transponder, which is located on or in the sawing tool and contains a distinctive code, and the identification unit, a reader, for reading this code. A coupling can be done by magnetic fields generated by the identification unit in short range or by high-frequency radio waves. This allows data to be transferred and the transponder to be supplied with energy. The identification unit preferably contains software that controls a reading process and an RFID middleware with interfaces to other computer systems and / or databases. The transponder preferably comprises an antenna, an analogue circuit for receiving and transmitting as well as a digital circuit and a permanent memory. The memory is preferably writable at least once and can be made invariable. Furthermore, a rewritable memory can be used to store preferably further information. This development is particularly advantageous in that the use of one of the rewritable memory no storage unit is necessary. The rewritable memory may include one, two, several or all of the sawing tool data, and optionally the predetermined reference or other data. By inserting the sawing tool and automatically identifying the sawing tool by means of the RFID system, the sawing tool profile data record can be automatically retrieved and assigned to the sawing tool in this manner. As an alternative to such an RFID system, it is also possible to use a conventional barcode which is designed to identify the sawing tool.

Furthermore, the RFID system of this kind can be used to control the sawing tool, in particular preferably the drive motor of the sawing tool. For this purpose, the rewritable memory of the RFID system may include information of a processing operation to be performed, which are read out and may preferably control the drive motor by means of a signal-technical coupling. As a result, all machining data can be included in the determination of the wear condition.

• - zumindest einer Angabe der Sägewerkzeugdaten ein Werkzeugverschleißfaktor zugeordnet ist, wobei der Werkzeugverschleißfaktor eine Kenngröße der zumindest einen Angabe der Sägewerkzeugdaten ist und
• - die Datenverarbeitungseinheit ausgebildet ist, um in Abhängigkeit des Werkzeugverschleißfaktors aus der Verschleißfortschrittsgröße eine korrigierte Verschleißfortschrittsgröße zu berechnen und aus dieser korrigierten Verschleißfortschrittsgröße den dem Sägewerkzeug zugeordneten Verschleißzustand zu ermitteln.

Furthermore, it is preferred that

• at least one indication of the sawing tool data is assigned a tool wear factor, wherein the tool wear factor is a parameter of the at least one indication of the sawing tool data, and
• - The data processing unit is adapted to calculate a function of the tool wear factor from the wear progress size a corrected wear progress size and to determine from this corrected wear progress size associated with the sawing tool wear state.

According to this development, the wear progress quantity can be corrected and thus determined more accurately. It should be noted that the more sawing tool data is present and included in the calculation, the more accurately the wear progress variable can be determined. The sawing tool data, such as the material, the thickness, the geometry and the size, in particular the diameter of the sawing tool, have an influence on the actual state of wear of the sawing tool. For example, the wear progress size of a thicker sawing tool is less than that of a thinner sawing tool in the same machining operation. It should be noted, however, that different sawing tool data also affect the actual wear of the sawing tool differently. Taking into account the tool wear factor of the at least one indication of the sawing tool, the wear can be determined even more accurately. Of particular importance is this correction in the use of sawing tools in particular of circular saw blades with different diameters. Calculating the wear rate from the engine load would, in the case of a larger diameter saw tool, result in greater wear and, in the case of a smaller diameter saw tool, erroneously result in less wear. This faulty relationship can be attributed to the torque. By considering the wear factor, which reflects the diameter, this erroneous relationship can be corrected. In this case, there is a reverse proportionality between this tool wear factor and the detectable wear progress quantity.

• - Betriebsdaten, wie Angaben einer Schnittlänge und/oder Schnittgeschwindigkeit und/oder Vorschubgeschwindigkeit und/oder Vorschublänge, und/oder
• - Werkstückdaten, wie Angaben einer Werkstückdicke und/oder einer Materialangabe oder Materialeigenschaft des zu bearbeitenden Werkstücks,

umfassen.A further preferred embodiment of the detection device is characterized in that the data processing unit is designed to receive processing data of a processing data set assigned to a workpiece to be processed, the processing data

• - Operating data, such as details of a cutting length and / or cutting speed and / or feed rate and / or feed length, and / or
• Workpiece data, such as details of a workpiece thickness and / or a material specification or material property of the workpiece to be machined,

include.

In addition to the sawing tool data mentioned above, the machining data of the workpiece to be machined also influence the wear of the sawing tool with which this workpiece is machined. By receiving the operating data and / or the workpiece data further influencing variables significant for the actual wear can be taken into account. The processing profile data record can hereby be stored in the memory unit, an external memory unit or in the RFID system.

• - in Abhängigkeit von zumindest den Betriebsdaten die dem Sägewerkzeug zugeordnete Verschleißfortschrittsgröße zu berechnen und
• - aus dieser Verschleißfortschrittsgröße den dem Sägewerkzeug zugeordnete Verschleißzustand zu ermitteln.

Furthermore, it is preferred that the processing data comprise operating data and the data processing unit is designed to

• to calculate, depending on at least the operating data, the wear progress size associated with the sawing tool; and
• - From this wear progress size to determine the sawing tool associated wear state.

The operating data of the machining data may include a cutting speed, a cutting pressure, a material feed parameter and / or further operating data. By incorporating the exact operating data, the wear progress quantity can be accurately calculated. Alternatively, the operating data of the machining data can be used to supplement and / or correct the detected operating data of the drive motor mechanically coupled to the sawing tool. As a result, the state of wear can be determined very accurately.

In a particularly preferred embodiment, the data processing unit and the memory unit can be designed such that the operating data of the processing data are assigned to a detected engine load and the combination of the operating data and the engine load is stored in the memory unit. By virtue of such a development of the invention, the data processing unit can be designed to be capable of learning. By assigning many different operating data to different engine loads, relationships between the engine loads and the various operating data can be determined and stored.

• - zumindest einer Angabe der Werkstückdaten ein Werkstückverschleißfaktor zugeordnet ist, wobei der Werkstückverschleißfaktor eine Kenngröße der zumindest einen Angabe der Werkstückdaten ist und
• - die Datenverarbeitungseinheit ausgebildet ist, um in Abhängigkeit des Werkstückverschleißfaktors aus der Verschleißfortschrittsgröße eine korrigierte Verschleißfortschrittsgröße zu berechnen und aus dieser korrigierten Verschleißfortschrittsgröße den dem Sägewerkzeug zugeordneten Verschleißzustand zu ermitteln.

Furthermore, it is preferred that

• - At least one indication of the workpiece data is associated with a workpiece wear factor, wherein the workpiece wear factor is a characteristic of the at least one indication of the workpiece data and
• - The data processing unit is adapted to calculate a function of the workpiece wear factor from the wear progress size a corrected wear progress size and to determine from this corrected wear progress size associated with the sawing tool wear state.

In addition to the operating data and the sawing tool data also the workpiece data play a significant role for the wear of the sawing tool. Of particular importance here are the material and the thickness of the workpiece. By incorporating the workpiece wear factor of the at least one indication of the workpiece data, the wear progress quantity can be determined more accurately.

The invention is based on the finding that the more influencing variables in relation to the operating data of a machining operation and the more information of the workpiece data in the one wear factor and the more information of the sawing tool data in the other wear factors are considered, the more accurately the actual state of wear of the sawing tool can be determined become. By determining the actual state of wear as accurately as possible, the critical state of wear can be recognized in good time and the sawing tool can be exchanged and / or sharpened without the need for replacement and / or sharpening being too early and thus unnecessary.

In general, a parameter is understood to mean a dimensionless characteristic number of the at least one indication of the sawing tool (tool wear factor) or of the at least one indication of the workpiece (workpiece wear factor). In this case, the wear factor may be the parameter of exactly one indication of the sawing tool or of the workpiece. Alternatively, two or more indications of the sawing tool or of the workpiece with respective parameters can be taken into account in the wear factor. These parameters may result from empirical values or test series and describe the influence of the respective at least one indication of the workpiece or the respective at least one indication of the sawing tool on the state of wear or the Wear rate size. The inclusion of such parameters is based on a method for calculating the state of wear. The basis for such a method is a mathematical model comprising at least the operating data of the drive motor, taking into account the sawing tool data and / or the workpiece data and the respective characteristics, which represent the non-detectable influences as a function of wear factors.

• - aus den Betriebsdaten und/oder den Werkstückdaten des Bearbeitungsdatensatzes und/oder gegebenenfalls den Sägewerkzeugdaten einen für eine Bearbeitung eines zu bearbeitenden Werkstücks Maximalverschleißzustand zu ermitteln, und
• - den Verschleißzustand mit dem Maximalverschleißzustand zu vergleichen, und
• - bei einem Verschleißzustand, der größer ist als der Maximalverschleißzustand, ein Qualitätswarnsignal auszugeben.

Further, it is preferable that the data processing unit is configured to

• to determine from the operating data and / or the workpiece data of the machining data set and / or optionally the sawing tool data for a machining of a workpiece to be machined maximum wear condition, and
• to compare the wear condition with the maximum wear condition, and
• - At a wear condition that is greater than the maximum wear condition to issue a quality warning signal.

Under a maximum wear condition is a maximum, expected state of wear, which can be determined from the operating data and / or the workpiece data of the processing data set and / or if available also from the sawing tool data to understand. This maximum wear condition is a theoretically expected value and can be used to control the determined state of wear. The operating data and / or workpiece data of the machining set are likewise theoretical values. As a result, an estimate of the service life of the sawing tool is possible. Nevertheless, an unpredictable wear, such as a crack, may occur, which is not reflected in the maximum wear condition. The unpredictable wear acts at least on the operating data of the drive motor, from which the wear progress size is calculated and finally the state of wear is determined. The quality warning signal serves to signal the occurrence of unpredictable wear in order, if necessary, to exchange and grind the sawing tool in good time.

• - aus dem Werkstückverschleißfaktor der zumindest einen Angabe der Werkstückdaten und dem Werkzeugverschleißfaktor der zumindest einen Angabe der Sägewerkzeugdaten einen Gesamtverschleißfaktor zu berechnen und
• - aus dem Gesamtverschleißfaktor und der Verschleißfortschrittsgröße eine korrigierte Verschleißfortschrittsgröße zu berechnen und aus dieser korrigierten Verschleißfortschrittsgröße den dem Sägewerkzeug zugeordneten Verschleißzustand zu ermitteln.

A further preferred development of the detection device is further characterized in that the data processing unit is designed to

• to calculate an overall wear factor from the workpiece wear factor of the at least one indication of the workpiece data and the tool wear factor of the at least one indication of the sawing tool data, and
• to calculate a corrected wear progress quantity from the total wear factor and the wear progress quantity and to determine the wear state assigned to the saw tool from this corrected wear progress variable.

By including both the at least one indication of the workpiece data and the at least one indication of the sawing tool data, the state of wear can be determined very accurately. This embodiment is particularly advantageous when the sawing tool is used for a very dimensionally accurate machining of workpieces.

• - als Betriebsdaten Messdaten einer mit der Datenverarbeitungseinheit signaltechnisch gekoppelten Messeinrichtung zu empfangen, wobei die Messdaten vorzugsweise eine Sägezahntemperatur und/oder eine Schnittgeschwindigkeit und/oder die Länge des geschnittenen Materials umfassen,
• - in Abhängigkeit von zumindest diesen Messdaten die dem Sägewerkzeug zugeordnete Verschleißfortschrittsgröße zu berechnen und
• - aus dieser Verschleißfortschrittsgröße den dem Sägewerkzeug zugeordnete Verschleißzustand zu ermitteln.

It is particularly preferred that the data processing unit is designed to

• to receive measurement data of a measuring device which is signal-technically coupled to the data processing unit as operating data, the measured data preferably including a sawtooth temperature and / or a cutting speed and / or the length of the cut material,
• to calculate, in dependence on at least these measured data, the wear progress quantity associated with the sawing tool, and
• - From this wear progress size to determine the sawing tool associated wear state.

Such measuring devices, such as, for example, infrared sensors and / or thermal imaging cameras, may be designed and / or selected such that they detect some, several or all operating data of the machining process. By means of these measuring devices, in addition to the operating data of the drive motor, further parameters which have an influence on the state of wear of the sawmill can be determined and taken into account in the calculation of the wear progress greetings.

It is further preferred if the data processing unit is designed to receive as operating data a feed force of a coupled feed device signal-wise with the data processing unit and to calculate the wear progress quantity associated with the saw tool as a function of at least this feed force. Preferably, the feed device is wired or wireless by means of a signal linkage connected to the data processing unit. Under a feed device is a part of a machine tool in particular a sliding table saw to understand, comprising a trolley on which the workpiece can be placed, and a control unit for programming the feed force with which a workpiece to be machined by means of the trolley to be moved in the feed direction. By such feed devices workpieces can be made very accurate.

• - den erfassten Verschleißzustand des Sägewerkzeugs zu signalisieren, insbesondere durch ein akustisches und/oder optisches Signal und/oder
• - einen Hinweis hinsichtlich des Verschleißzustands anzuzeigen, insbesondere bevorzugt in Form einer noch ausführbaren Schnittlänge.

In accordance with a further preferred embodiment, it is provided that the detection device comprises an electronic interface which is signal-technically coupled to the data processing unit and which is designed to be

• - Signal the detected state of wear of the sawing tool, in particular by an acoustic and / or optical signal and / or
• - To indicate an indication of the state of wear, particularly preferably in the form of a still executable cut length.

The data processing unit may preferably be designed such that it sends a signal of a determined state of wear to the electronic interface. By sending this signal to the electronic interface, the operator can be made aware of the state of wear, in particular the critical state of wear, to replace a sawing tool in time or sharpening. The electronic interface can be designed as a light source and / or noise source to emit an acoustic or an optical signal. Particularly preferably, the electronic interface is designed as a screen on which the state of wear can be displayed. It is particularly preferred that the signal which is sent from the data processing unit to the electronic interface, the state of wear as a function of a still executable cut length. This remaining cut length can then be displayed on the screen. By such an indication of the wear condition, an operator can estimate relatively accurately how long a sawing tool can still be used or used.

• - einen Verschleißzustand zurückzusetzen, und/oder
• - gegebenenfalls den Sägewerkzeugprofildatensatz zu programmieren und/oder zu ändern und gegebenenfalls in der Speichereinheit zu speichern, und/oder
• - gegebenenfalls den Bearbeitungsprofildatensatz zu programmieren und/oder zu ändern und gegebenenfalls in der Speichereinheit zu speichern, und/oder
• - gegebenenfalls die vorgegebene erste Bezugsgröße zu programmieren und/oder zu ändern und gegebenenfalls in der Speichereinheit zu speichern, und/oder

gegebenenfalls einen Vorrang des Maximalverschleißzustands vor der vorgegebenen Bezugsgröße oder umgekehrt zu programmieren,Durch die derartige Benutzerschnittstelle kann der ermittelte Verschleißzustand vom Bedienpersonal zurückgesetzt werden. Das ist insbesondere dann vorteilhaft, wenn ein Sägewerkzeug nicht ausgetauscht sondern lediglich nachgeschliffen werden soll. Ein Sägewerkzeug kann nach dem Nachschleifen wieder eingesetzt und verwendet werden. Die Benutzerschnittstelle kann auch derart ausgebildet sein, dass das Bedienpersonal auf den Sägewerkzeugprofildatensatz zugreifen kann und die Sägewerkzeugdaten zu ändern und ggf. in der Speichereinheit zu speichern. Der Bearbeitungsprofildatensatz wird oftmals über eine Benutzerschnittstelle der Werkzeugmaschine selbst programmiert oder geändert. Die Benutzerschnittstelle der Detektionsvorrichtung kann auch ausgebildet sein, um den Bearbeitungsprofildatensatz zu programmieren und/oder zu ändern.A further preferred embodiment of the detection device is characterized in that the electronic interface is designed as a user interface, which is designed to

• - Reset a state of wear, and / or
• if necessary, to program and / or modify the sawing tool profile data record and if necessary store it in the memory unit, and / or
• if necessary, to program and / or modify the editing profile data record and if necessary store it in the memory unit, and / or
• if necessary, to program and / or modify the predetermined first reference and if necessary store it in the memory unit, and / or

if appropriate, to program a priority of the maximum wear condition before the predetermined reference value or vice versa. By means of such a user interface, the determined wear condition can be reset by the operator. This is particularly advantageous if a sawing tool is not exchanged but merely reground. A sawing tool can be used again after regrinding and used. The user interface can also be designed such that the operating personnel can access the sawing tool profile data record and change the sawing tool data and, if necessary, store it in the memory unit. The machining profile data set is often programmed or changed via a user interface of the machine tool itself. The user interface of the detection device can also be designed to program and / or change the machining profile data record.

A further particularly preferred embodiment variant of the detection device provides that each sawing tool is assigned an identification code and the data processing unit is designed to identify a sawing tool by means of the identification code entered via the user interface and if necessary to retrieve the sawing tool profile data set of the recognized sawing tool from the memory unit. This preferred embodiment variant represents a simple possibility of being able to identify the sawing tool and, if appropriate, of being able to assign the corresponding sawing tool profile data set, if appropriate, to the sawing tool, to the reference variable. It is necessary that each sawing tool must be assigned an individual identification code, which must also be stored in the respective sawing tool profile data record for identification. This code is preferably easily visible attached to the sawing tool itself.

• - den Verschleißzustand des Sägewerkzeugs zu ermitteln,
• - diesen ermittelten Verschleißzustand in dem Sägewerkzeugprofildatensatz zu speichern,
• - diesen ermittelten Verschleißzustand mit der vorgegebenen Bezugsgröße und/oder gegebenenfalls der ermittelten Bezugsgröße zu vergleichen und
• - mittels der Sägewerkzeugidentifikationseinheit ein Herausnehmen und ein erneutes Einsetzens des Sägewerkzeugs zu erkennen.

In a further preferred embodiment of the detection device is provided that the data processing unit is designed to

• to determine the state of wear of the sawing tool,
• to store this determined wear condition in the saw tool profile data set,
• - Compare this determined wear condition with the specified reference value and / or, where appropriate, the determined reference value, and
• - To recognize by means of the sawing tool identification unit removal and reinsertion of the sawing tool.

This preferred embodiment makes it possible to store the state of wear of the sawing tool to retrieve this after removing and re-inserting the sawing tool and to choose as a new Anfangsverschleißfaktor. This is particularly advantageous when two or more sawing tools are used alternately and they have not yet reached a critical state of wear before replacing, so they do not have to be replaced or reground.

It is particularly preferred if the data processing unit is designed to reset the state of wear depending on the removal after exceeding the predetermined reference value and / or possibly the determined reference value by the determined state of wear and the renewed insertion of the sawing tool. By such training, the state of wear after the predetermined reference value and / or possibly the determined reference value has been exceeded, are automatically reset. For this, it is necessary that the data processing detects the removal of the sawing tool after exceeding the reference and is designed to reset the state of wear in this case. This assumes that the operator actually also grinds the removed sawing tool when the reference value has been exceeded.

Furthermore, it is preferred that the saw tool profile data record comprises a quality factor which indicates a quality of the sawing tool and a maximum tolerable wear state of this sawing tool associated with the quality factor, wherein the data processing unit is designed to compare the determined wear condition with the predetermined specific reference value. This embodiment is particularly advantageous when sawing tools of a different quality are used. Sawing tools of different quality also have different uses. Accordingly, a distinction is made between sawing tools, which are used for a very dimensionally accurate machining of a workpiece and which are used only for coarse machining, for example, a separation process of a workpiece. Sawing tools, which are used for a very dimensionally accurate machining and sawing tools for rough machining have very different requirements for a tolerable state of wear. While sawing tools for rough machining must have a very high level of wear, the wear of the sawing tool for dimensionally accurate machining of the workpiece must be kept low. By considering the quality of the sawing tool, the labor of the operator for replacement or regrinding can be kept low.

According to a further aspect of the present invention, the object mentioned at the outset is achieved by a machine tool having a sawing tool, in particular a sliding table saw, comprising a detection device for determining a state of wear of a sawing tool.

This machine tool can be equipped in particular with the previously described detection device or parts thereof. Furthermore, it is to be understood that the detection device according to the invention, in particular of such type, can preferably be developed in such a way that it has those developments of the previously explained detection device. Furthermore, the machine tool is further developed in particular such that it comprises one, two, several or all components which are necessary for the further developments of the previously explained detection device. For this purpose, the machine tool comprises at least one drive motor, which is connected wirelessly or by wire to the data processing unit of the detection device. Further, the machine tool may comprise a tool support surface, in which a sensor, preferably an optical sensor in the workpiece-related feed direction is arranged in front of the sawing tool.

• - Empfangen von Betriebsdaten eines mit einem ersten Sägewerkzeug mechanisch gekoppelten Antriebsmotors,
• - Berechnen einer dem ersten Sägewerkzeug zugeordneten ersten Verschleißfortschrittsgröße in Abhängigkeit von zumindest diesen Betriebsdaten und
• - Ermitteln eines dem ersten Sägewerkzeug zugeordneten ersten Verschleißzustands aus der ersten Verschleißfortschrittsgröße.

According to another aspect of the present invention, the object mentioned at the outset is achieved by a computer-implemented method for determining a state of wear of a sawing tool of a machine tool by means of a detection device, comprising:

• Receiving operating data of a drive motor mechanically coupled to a first sawing tool,
• - Calculate a first saw associated with the first sawing tool Wear progress size as a function of at least this operating data and
• Determining a first wear state associated with the first sawing tool from the first wear progress quantity.

This method can be carried out in particular with the previously described detection device or parts thereof. Furthermore, it is to be understood that the method according to the invention, in particular of such type, can preferably be developed in such a way that it comprises or makes possible those method steps which are provided by the previously explained further developments of the detection device according to the invention.

• 1 Eine schematische Detailansicht einer beispielhaften Ausführungsform einer erfindungsgemäßen Formatkreissäge mit einer Detektionsvorrichtung;
• 2 eine erste schematische Ausführungsform der Verschleißzustandsermittlung mit der erfindungsgemäßen Detektionsvorrichtung;
• 3 eine zweite Ausführungsform der Verschleißzustandsermittlung mit der erfindungsgemäßen Detektionsvorrichtung;
• 4 eine dritte Ausführungsform der Verschleißzustandsermittlung mit der erfindungsgemäßen Detektionsvorrichtung;
• 5 eine vierte Ausführungsform der Verschleißzustandsermittlung mit der erfindungsgemäßen Detektionsvorrichtung.

In the following, preferred embodiments of the invention will be explained with reference to the accompanying figures. Show it:

• 1 A schematic detail view of an exemplary embodiment of a sliding table saw according to the invention with a detection device;
• 2 a first schematic embodiment of the wear condition determination with the detection device according to the invention;
• 3 a second embodiment of the wear condition determination with the detection device according to the invention;
• 4 a third embodiment of the wear condition determination with the detection device according to the invention;
• 5 a fourth embodiment of the wear condition determination with the detection device according to the invention.

In the figures, identical or substantially functionally identical or similar elements are denoted by the same reference numerals.

The sliding table saw 1 according to 1 has a machine base 4 in which a sawing tool 10 in the form of a circular saw blade on a sawing unit (not visible) is arranged. The sawing tool 10 protrudes from a workpiece support surface 2 upwards. Furthermore, on the machine base frame 4 a trolley 60 arranged for a linear movement in a horizontal direction along a saw line 3 of the sawing tool 10 is guided linearly. On the trolley 60 An angle miter fence 54 is attached to the trolley 60 moved and an angle stop rail 53 carries. At the angle stop rail 53 can work on the trolley 60 and a bearing surface of the angular miter stop 54 lie with an edge applied to thereby set a defined angular orientation and maintain during sawing. Along the angle stop rail 53 are two stop flaps 51 . 52 in the longitudinal direction of the angle stop rail 53 movable and arranged fixed therein. By means of the stop flaps 51 . 52 a further edge of the workpiece can be held in a defined position, thereby adjusting a Schnittmaß. The angular miter stop 54 can be pivoted in a horizontal plane in the manner of a parallelogram, whereby the angle stop rail 53 in different angular positions to the saw line 3 can be aligned.

By means of a pivotable on the machine base frame 4 attached telescopic arm 55 is the outboard edge of the angle miter fence 54 supported in the vertical direction to carry a workpiece can. At the workpiece support surface 2 is still a rip fence 50 arranged, which is parallel to the saw line 3 extends and forms an alternative or additional abutment surface for a workpiece edge, when a cut is to be carried out, which is to run parallel to an edge of the workpiece.

The sliding table saw 1 further comprises a feed sensor 20 , which is signal-technically coupled to a data processing unit 100. The feed sensor 20 is designed to advance a workpiece relative to the sawing tool 10 to detect in a feed direction. The feed sensor 20 is integrated flush in the workpiece support surface 2. At the point where the feed sensor 20 is arranged - in a workpiece-related feed direction in front of the sawing tool 10 - no cut has been made on the workpiece yet.

Furthermore, the sliding table saw includes 1 a user interface 40 that is configured to reset a wear state, to program and modify the saw tool profile data set and, if necessary, to store in the memory unit, to program, modify and optionally store the machining profile data record in a memory unit (not shown), to a predetermined reference value program, modify and, if necessary, save in the memory unit. In addition, the operator can provide an identification code 11 of the sawing tool 10 via the user interface 40 enter. By the signaling link of the data processing unit 100 with the user interface 40 For example, a saw tool profile record may be retrieved from the storage unit in response to the entered identification code 11 of the sawing tool 11 from the data processing unit 100 be retrieved. Through this training, a sawing tool 11 can be easily identified and associated with the sawing tool, the corresponding Sägewerkzeugprofildatensatz. The User interface 40 is on an articulated arm device 30 arranged. For this purpose, the identification code 11 is easily visible on the sawing tool 10 self-attached.

The user interface 40 also has a screen 41 and a noise source 42 in the form of a loudspeaker in order to signal a detected state of wear can. In addition, the user interface points 40 controls 43 to allow input from the operator.

The trolley 60 is part of one with the data processing unit 100 signal-technically coupled feed device. The advancing device further comprises a control unit (not shown) connected to the user interface 40 is technically linked. This allows a feed movement of the trolley 60 and thus a feed force with which the workpiece is to be moved in the feed direction, via the controls 43 the user interface 40 be programmed.

The sawing tool 10 the format circular saw 1 is driven by a drive motor (not shown). The drive motor is signal-wise coupled to the data processing unit 100. By this configuration, the data processing unit 100 Operating data of the drive motor received.

According to 2 is the drive motor 200 with the data processing unit 100 linked by signal technology. Further, the data processing unit 100 designed to operate data 201 of the drive motor 200 to recieve. Moreover, the data processing unit is designed to operate in dependence on this operating data 201 a sawing tool 10 assigned wear progress size 101 to calculate and from this wear progress size 101 a sawing tool 10 assigned wear state 102 to determine. By this configuration, the state of wear 102 of the sawing tool 10 be checked continuously or if necessary in real time. The operating data 201 of the drive motor 200 include at least information about a cutting pressure and a condition of the workpiece, which are based in particular on a thickness and a material of the workpiece. Consequently, with the operating data 201 of the drive motor 200 a first approximation to the actual state of wear of the sawing tool 10 be determined.

The 3 to 5 show further embodiments of the wear state determination with the detection device according to the invention. According to 3 is a feed sensor 20 in the workpiece support surface 2 integrated and with the data processing unit 100 linked by signal technology. The data processing unit 100 is formed to a feed signal 501 of the feed sensor 20 to receive when a workpiece on the workpiece support surface 2 is moved in the feed direction. The feed signal 501 includes a material feed parameter 510 , which consists of the feed rate 511 and the feed length 512 composed. Further, the feed signal 501 includes a processing time 520 , The processing time 520 This corresponds to the time in which the workpiece is processed, ie the workpiece in the feed direction on the workpiece support surface 2 is moved. Moreover, the data processing unit 100 is designed to store operating data 201 a drive motor 200 to recieve. As operating data 201 is a power consumption 210 as engine load 211 detected. The data processing unit 100 calculates from the feed length 512 , the feed rate 511, the processing time 520 and the engine load 211 a wear progress quantity 101. Ultimately, the data processing unit 100 is signal-technically linked to a memory unit 300 and configured to receive an initial wear state from the memory unit 300 310 and to add the wear progress quantity 101 to the wear state 102 to investigate. This wear state 102 is in a last step in the memory unit 300 Saves and replaces the initial wear condition 310 ,

In 4 an alternative embodiment of the wear condition determination is shown. Here is the data processing unit 100 with a drive motor 200 signal technically linked and trained to operating data 201 of the drive motor 200 to recieve. As operating data 201 becomes the engine load 211 detected in the form of a current consumption 210. Furthermore, the operating time 220 of the drive motor 200 comprising an idle time 221 and a service life 222 detected. Due to the record of engine load 211 and in particular the time at which the engine load 211 and to which it ends, an operating load time 222 may be determined. From the difference of the operating period 220 and the service life 222 then results in an idle time 221 in which the sawing tool 10 is indeed in operation, but no workpiece is processed. According to this embodiment, the data processing unit 100 trained to a machining record with editing data 400 retrieve. This processing data set 400 may be, for example, in a control unit of a sliding table saw 1 be deposited. The processing data 400 include exact operating data 410 for a workpiece to be machined. According to this embodiment, the data processing unit 100 calls a Schnittläge 411 and a cutting speed 412 of the machining process. Analogous to 3 , is the data processing unit 100 also according to 4 with a storage unit 300 signal-technically linked and adapted to the memory unit 300 an initial wear condition 310 retrieve. According to the invention, the data processing unit 100 in the present case, the wear progress quantity 101 is formed from the engine load 211 , the operating time, the idle time, the cutting length 411 and the cutting speed 412 to calculate. The cutting speed can be determined based on data of the tool, for example in the case of a circular saw blade of the diameter of the tool, and the movement speed, in the example, the rotational speed of the circular saw blade. From this wear progress size 101 and the initial wear condition 310 Then in a next step, the state of wear 102 be determined. This wear state 102 is in the storage unit 300 stores and replaces the initial wear state 310.

In 5 a variant is described which allows a very accurate determination of wear condition. For this purpose, a feed sensor 20 in a workpiece support surface 2 of the sliding table saw 1 intended. Due to a signal-technical coupling of the feed sensor 20 with the data processing unit 100 , the data processing unit 100 may be a feed-forward signal 501 to capture. This feed signal 501 includes a material feed parameter 510 at a feed rate 511 and a feed length 512. In addition, the data processing unit 100 associated with a drive motor 200 signal technology and trained to operating data 201 of the drive motor 200. This operating data 201 include a power input 210, from which an engine load 211 can be determined. In addition, an operating period 220 comprising an idle time 221 and an operational stress time 222 is recorded. By recording the change in power consumption 210 can on the service life 222 getting closed. From the difference between the operating time 220 and the service life 222 then results in the idle time 221.

The data processing unit 100 is configured to provide a machining data set with machining data 400, including workpiece data 420 retrieve. According to this embodiment, a material of the workpiece 421 and a thickness of the workpiece 422 from the data processing unit 100 detected. This workpiece data 420 is a workpiece wear factor 450 assigned. The workpiece wear factor 450 takes into account a characteristic of the material 421 and a characteristic of the thickness 422 of the workpiece. Further, the data processing unit 100 with a storage unit 300 linked by signal technology. In this storage unit 300 is a sawmill profile data set 330 comprising sawing tool data in the form of a thickness of the sawing tool 331 , a diameter of the sawing tool 332 and a material of the sawing tool 333 deposited. Analogous to the workpiece data 420 Also, the Saw Tool Profile Record 330 data is a tool wear factor 450 assigned. The data processing unit 100 is adapted to the feed length 512 , the feed rate 511, the engine load 211 , the operating stress time 222 , the idle second 221, the material 421 and the thickness 422 of the workpiece, as well as the thickness 331 , the diameter 332 and the material 333 of the sawing tool to determine a wear progress quantity 101. Further, the data processing unit 100 designed to be out of the tool wear factor 350 and the workpiece wear factor 450 has an overall wear factor 150 and from the total wear factor 150 and the wear progress size 101 to calculate a corrected wear progress quantity 151. By retrieving the initial wear condition 310 from the storage unit 300 and adding this initial wear condition 310 to the corrected wear progress quantity 151 can then the state of wear 102 be determined. This state of wear 102 will then be in the storage unit 300 Saves and replaces the initial wear condition 310 ,

LIST OF REFERENCE NUMBERS

1

Panel saw

2

Workpiece support surface

3

sawing line

4

Machine base frame

10

sawing tool

11

identification code

20

advance sensor

30

Knickarmvorrichtung

40

User interface

41

screen

42

noise source

43

controls

50

rip fence

51, 52

flip stops

53

Angle stop rails

54

Winkelgehrungsanschlag

55

telescopic arm

60

trolley

100

Data processing unit

101

Wear rate Size

102

wear state

150

Total wear factor

151

corrected wear progress size

200

drive motor

201

operating data

210

current consumption

211

Engine load / operating stress

220

Operating time

221

Idle Time

222

Operating stress time

300

storage unit

310

Initial wear state

330

Sawing tool profile record

331

Thickness of the sawing tool

332

Diameter of the sawing tool

333

Material of the sawing tool

350

Tool wear factor

400

Processing data record with processing data

410

operating data

411

cutting length

412

cutting speed

420

Workpiece data

421

Material of the workpiece

422

Thickness of the workpiece

450

Workpiece wear factor

501

advance signal

510

Material feed parameters

511

feed rate

512

feed length

520

processing time

Claims (28)

Detection device for determining a state of wear of a sawing tool of a machine tool comprising a data processing unit, characterized in that the data processing unit is adapted to - receive operating data of a first sawing tool mechanically coupled drive motor, - depending on at least these operating data a first sawing tool associated first wear progress size to calculate and - from the first wear progress size to determine a first wear state associated with the first sawing tool. Detection device according to Claim 1 characterized in that the data processing unit is configured to: receive operating time and operating load as operating data, calculate operating time from operating time and operating load, and calculate the amount of wear progress as a function of at least said operating time; Operating time indicates a time in which the first sawing tool is in operation, ◯ the operating stress indicates that the first sawing tool is in operation under load and ◯ the service life indicates a time in which the first sawing tool is under load in operation. Detection device according to one of Claims 1 or 2 , characterized in that the data processing unit is designed to receive as an operating data an engine load of the drive motor and to calculate the wear progress size as a function of at least this engine load. Detection device according to Claim 3 , characterized in that the data processing unit is designed to receive as operating data a current consumption of the drive motor and to determine the motor load from the current consumption of the drive motor. Detection device according to one of the preceding claims, characterized by a with the data processing unit signal-coupled feed sensor, which is designed to detect a feed of a workpiece relative to the first sawing tool in a feed direction, wherein the data processing unit is designed to be a feed signal of the feed sensor as the operating data receive and from this feed signal - to determine a processing time and / or - to determine a material feed parameter, in particular a feed rate and / or a feed length, and - calculate the wear progress quantity as a function of at least the machining time and / or the material feed parameter. Detection device according to Claim 5 , characterized in that the feed sensor is used in a workpiece support surface of the machine tool and detects a feed movement of a moving over the feed sensor workpiece, in particular by the feed sensor detects the workpiece optically or by the feed sensor includes a mechanical, rotatably mounted sensing element, with the workpiece in Contact is and is set by the feed movement in rotation. Detection device according to Claim 5 or 6 , characterized in that the feed sensor is an optical sensor, comprising a light source preferably a light emitting diode or a laser diode, a sensor chip [acts as a camera] and a signal connected to the sensor chip arithmetic unit and further characterized in that - the sensor chip is formed of a workpiece, which is moved over the feed sensor and illuminated by the light source, to capture reflected image and - the arithmetic unit is adapted to a movement of the workpiece by means of image processing in the form of a picture pattern sequence consisting of two, three or more detected by the sensor chip Images, to capture. Detection device according to one of the preceding claims comprising a signal processing unit coupled to the data processing unit memory unit in which at least a first Sägewerkzeugprofildatensatz is stored, which at least the first sawing tool associated first Sägewerkzeugdaten, particularly preferably a geometric indication such as a thickness or a diameter, a material quality material properties of the sawing tool , an indication of use such as fine cut / coarse cut, an indication of the materials to be cut with the sawing tool and / or the time points of previous re-sharpening or a time of the last re-sharpening of the first sawing tool. Detection device according to Claim 8 characterized in that the data processing unit is adapted to store the first wear state of the first sawing tool in the first saw tool profile data set [during and after the machining operation] and further characterized in that the data processing unit is adapted to: - retrieve the stored first wear condition; To receive operating data of the drive motor mechanically coupled to the first sawing tool, to calculate a further wear progress variable associated with the first sawing tool in dependence on at least said operating data, and from the retrieved stored first wear condition and the further first wear progress quantity to an updated first wear condition associated with the first sawing tool determine. Detection device according to one of Claims 8 or 9 characterized in that - the storage unit comprises a predetermined first reference indicative of a maximum tolerable wear condition of the first sawing tool, and - the data processing unit is adapted to compare the first state of wear with the predetermined first reference. Detection device according to one of Claims 8 to 10 characterized in that the memory unit is adapted to store first, second, and optionally further saw tool profile datasets associated with a first, second, and further sawing tool, and wherein the data processing unit is adapted to receive a sawing tool identification signal indicative of a particular sawing tool from the first, second and optionally further sawing tools selects, and to calculate a corresponding according to the first, second and optionally further sawing tool wear progress size and state of wear. Detection device according to Claim 11 comprising a sawtooth identification unit coupled to the data processing unit and configured to detect a sawing tool by means of an identification unit attached to the sawing tool, characterized in that the data processing unit is adapted to retrieve a sawing tool profile dataset of a recognized sawing tool from the storage unit and perform the calculation of the state of wear for that sawing tool based on this retrieved sawing tool profile data set. Detection device according to Claim 12 , characterized in that the sawing tool identification unit comprises an RFID system with a transponder attached to the sawing tool. Detection device according to one of Claims 8 to 13 characterized in that - at least one indication of the sawing tool data is associated with a tool wear factor, wherein the tool wear factor is a characteristic of the at least one indication of the sawing tool data, and - the data processing unit is designed to calculate a corrected wear progress quantity as a function of the tool wear factor from the wear progress quantity This corrected wear progress size to determine the wear state associated with the sawing tool. Detection device according to one of the preceding claims, characterized in that the data processing unit is adapted to receive processing data of a workpiece to be machined processing data set, wherein the processing data - operating data, such as details of a cutting length and / or cutting speed and / or feed rate and / or feed length and / or speed and diameter of the tool, and / or - workpiece data, such as indications of a workpiece thickness and / or a material specification or material property of the workpiece to be machined include. Detection device according to Claim 15 in which the machining data comprise operating data, characterized in that the data processing unit is designed to - in dependence on at least the operating data to calculate the wear progress size associated with the sawing tool and - to determine the state of wear associated with the sawing tool from this wear progress variable. Detection device according to one of Claims 15 or 16 characterized in that - at least one indication of the workpiece data is associated with a workpiece wear factor, wherein the workpiece wear factor is a characteristic of the at least one indication of the workpiece data, and - the data processing unit is designed to calculate a corrected wear progress quantity as a function of the workpiece wear factor from the wear progress quantity This corrected wear progress size to determine the wear state associated with the sawing tool. Detection device according to one of Claims 15 to 17 , characterized in that the data processing unit is designed to - from the operating data and / or the workpiece data of the machining data set and / or optionally the Sägewerkzeugdaten to determine a machining of a workpiece to be machined maximum wear condition, and - to compare the state of wear with the maximum wear condition, and at a wear condition greater than the maximum wear condition, output a quality alert signal. Detection device according to one of Claims 14 or 17 characterized in that the data processing unit is adapted to - calculate from the workpiece wear factor the at least one indication of the workpiece data and the tool wear factor of the at least one indication of the sawing tool data an overall wear factor and - calculate and calculate from the total wear factor and wear progress size a corrected wear progress size corrected wear progress size to determine the wear state associated with the sawing tool. Detection device according to one of the preceding claims, characterized in that the data processing unit is designed to receive - as operating data measurement data of a signal-technically coupled to the data processing unit measuring device, the measured data preferably a sawtooth temperature and / or a cutting speed and / or the length of the cut material comprise, - in dependence on at least these measurement data to calculate the wear progress size associated with the saw tool, and - to determine the state of wear associated with the saw tool from this wear progress quantity. Detection device according to one of the preceding claims, characterized in that the data processing unit is designed to - as operating data to receive a feed force of the data processing unit signal technically coupled feed device and - to calculate depending on at least this feed force the sawing tool associated wear progress size. Detection device according to one of the preceding claims, comprising an electronic interface which is signal-technically coupled to the data processing unit and which is designed to signal the detected wear state of the sawing tool, in particular by an acoustic and / or optical signal, and / or to indicate an indication of the state of wear, in particular in the form of a still executable cut length. Detection device according to Claim 22 , characterized in that the electronic interface is designed as a user interface which is designed to: - reset a wear state, and / or - if necessary to program and / or modify the saw tool profile data record and to store it in the memory unit, if applicable, and / or - if necessary, to program and / or modify the machining profile data record and to store it in the memory unit, if applicable; and / or if necessary to program and / or modify the predetermined first reference and if necessary to store it in the memory unit, and / or optionally to give priority to Maximum wear condition before the specified reference value or vice versa. Detection device according to Claim 23 characterized in that - each sawing tool is associated with an identification code, and - the data processing unit is adapted to identify a sawing tool by means of the identification code entered via the user interface and optionally retrieve the sawing tool profile data set of the recognized sawing tool from the storage unit. Detection device according to one of the preceding claims and the Claims 9 to 13 , characterized in that the data processing unit is designed to - determine the state of wear of the sawing tool, - store this determined state of wear in the Sägewerkzeugprofildatensatz, - compare this determined state of wear with the predetermined reference value and / or, where appropriate, the determined reference variable and - Saw tool identification unit to recognize a removal and re-insertion of the sawing tool. Detection device according to Claim 25 , characterized in that the data processing unit is further configured to reset the state of wear as a function of - removing after exceeding the predetermined reference value and / or optionally the determined reference value by the determined state of wear and - the re-insertion of the sawing tool. Detection device according to one of the preceding claims and Claim 9 characterized in that the sawing tool profile data set comprises a quality factor indicative of - a quality of the sawing tool, and - indicates a maximum tolerable wear state of this sawing tool associated with the quality factor, and further characterized in that the data processing unit is adapted to determine the determined wear condition with the maximum to compare tolerable state of wear. Machine tool with a sawing tool, in particular a sliding table saw, comprising a detection device for determining a state of wear of a sawing tool, in particular according to one of the preceding claims.

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