Processing device with a light signal display device and method

Abstract

Processing device (2), in particular a wide belt sander, for processing preferably plate-shaped workpieces (W), which preferably consist at least in sections of wood, wood-based material and / or plastic, comprising a control device (20) and at least one light signal display device (10) which displays information on the processing device (2) in such a way that the information displayed by the light signal display device (10) is perceptible to an operator, wherein the control device (20) is configured to control the light signal display device (10) in such a way that the operator is informed of a state of wear of at least one tool of the processing device (2) and / or an advantageous insertion position (EP V ) of a workpiece (W) to be machined as the information is displayed, and wherein the control device (20) is further configured to determine the advantageous insertion position (EP V ) of the workpiece (W) to be machined and to display it to the operator using the light signal display device (10).

Description

Field of the InventionThe invention relates to a processing device, in particular a wide-belt grinding machine, for processing preferably plate-shaped workpieces, and to a method.Prior ArtIn the area of the machining devices, in particular in machining devices which are used in the area of the handle, the workpiece handling is usually entirely present to the operator of the machining device, which can lead to the tool of the machining device not being worn uniformly over the engagement time of the tool. Here, the term "engagement time" is to be understood as meaning the time which the tool was already engaged. Uneven wear of the tool can oppose a constant surface quality of the workpieces to be machined.Furthermore, partial (one-sided) wear of a tool can still accelerate the wear of the tool and in the worst case lead to damage to the tool and, if appropriate, to the workpiece being machined at the moment.For example, in wide-belt grinding machines as a specific example of a machining apparatus, it is generally known that the individual workpieces to be machined often do not occupy the full width of the wide-belt grinding machine. This has the result that, when processing such a workpiece, only a certain part of the abrasive (abrasive belt) is used and thus worn, the remaining part of the abrasive being unused. This leads to the need for the operator to distribute the workpieces to be machined over the entire width of the wide-belt grinding machine and over the entire engagement time of the grinding means (grinding belt) in such a way that the grinding means is worn out approximately uniformly.DE 20 2011 101 666 U1 describes a plate processing apparatus having a control device and a light signal display apparatus coupled thereto by signal technology, wherein the light signal display apparatus comprises a multiplicity of LEDs. By appropriate actuation of the LEDs, an area in which a workpiece is to be placed can be displayed to an operator. The current position of a saw unit belonging to the machining device can also be displayed.DD 216 888 A1 describes a sensor for measuring the cutting time and detecting tool breakage on turning tools, wherein the sensor detects the effective cutting time of the turning tool during machining, determines and displays the cutting time still available up to a preset end of service life, and signals tool breakage.EP 0 268 119 A2 describes a belt grinding machine having a pressing device, the pressing force of which is controlled by means of a signal processing unit taking into account workpiece parameters which are determined with the aid of a light source and a light sensor.DE 10 2009 048 442 A1 describes an apparatus for processing workpieces, having a conveying device for conveying the workpieces in a conveying direction, an optical detection device for detecting a position of a structure of the workpieces conveyed on the conveying device, and an alignment device for displacing and aligning the workpieces conveyed on the conveying device on the basis of the detection result of the detection device.DE 199 26 946 A1 describes a device for pneumatic position control of a workpiece with respect to a predetermined workpiece arrangement in a workpiece receptacle, wherein an LED display indicates by color identification of the fields whether or not the workpiece is correctly inserted into the workpiece receptacle.SUMMARY OF THE INVENTIONIt is therefore the object of the present invention to provide a processing device, in particular a wide-belt grinding machine, for processing preferably plate-shaped workpieces, with which a substantially consistently high processing quality is ensured.The object is achieved by a processing device according to claim 1 and a method according to claim 13. Features of the dependent apparatus and method claims can be applied to the independent claims. For example, a control device of the processing apparatus can be configured or designed to carry out specific method steps.One of the core idea of the present invention is to visually indicate a wear state of a tool of the machining device and / or an advantageous insertion position of the workpiece to be machined in the machining device by means of a light signal display device of an operator of the machining device.By means of the suggested light signal display device, the current wear state of a tool and / or an advantageous insertion position of a workpiece to be machined by means of the machining device can thus always be displayed to an operator of the machining device in a simple and reliable manner. As a result, the operator can be provided with a means which allows the operator to wear the tool approximately uniformly over the engagement time of the tool, which contributes to a longer service life of the tool and to a constant and high surface quality of the workpiece to be machined.According to the present invention, the processing device, in particular a wide-belt grinding machine, for processing preferably plate-shaped workpieces, which preferably consist at least in sections of wood, wood material and / or plastic, has a control device and at least one light signal display device, which displays information on the processing device in such a way that the information displayed by the light signal display device is visible or perceptible to an operator. By means of the light signal display device, the operator can be visually displayed as the information a wear state of a tool of the machining device and / or an advantageous insertion position of the workpiece to be machined in the machining device. Furthermore, the advantageous insertion position of the workpiece to be machined can be determined by means of the control device and on the basis of the ascertained wear state of the tool and on the basis of the detected length dimensions of the workpiece to be machined, which insertion position can be displayed to the operator on the basis of the light signal display device.In this way, a light signal display device is provided, with which, for example, in a wide-belt grinding machine as a specific example of a machining device, the wear state of the grinding belt or an advantageous insertion position of the workpiece to be machined can be visually displayed to the operator in a simple and reliable manner. This is advantageous in particular in the case of wide-belt grinding machines, since, as already explained above, in the case of wide-belt grinding machines which are used in the field of the handpiece, the parts handling is usually completely present to the operator of the machine, as a result of which it is necessary for the operator to uniformly distribute the parts to be processed over the entire width of the wide-belt grinding machine and over the entire engagement time of the grinding belt in order to uniformly wear the grinding belt.In this case, the operator can support the light signal display device according to the invention, since the operator can always visually display the current wear state of the grinding belt and / or the advantageous insertion position of the workpiece currently to be machined in a simple and reliable manner.This makes it possible to uniformly distribute the wear of the grinding belt over the entire width of the wide-belt grinding machine and thus to increase the engagement time of the grinding belt and to ensure a constant surface quality of the workpieces to be machined.The processing device preferably comprises a conveying device, in particular a belt, chain or belt conveyor, which is configured to move the workpiece to the processing tool and optionally to convey it further out of the processing device.The light display device is preferably provided on an insertion region of the machining device, at which the workpiece to be machined can be inserted into the machining device and / or moved to the tool by means of a conveying device. The insertion region is generally a workpiece holder into which the workpiece can be inserted and on which a conveying device for moving the workpiece can be arranged. Preferably, the light signal display device is arranged above the insertion region in the vertical direction. However, it is also possible to display the information on the insertion area, in particular vertically above the insertion area.It is thus possible to display the information about the wear state of the tool and / or the advantageous insertion position of the current workpiece in a simple and reliable manner to the operator of the machining device directly on site, i.e. directly at the location at which the operator has to insert the workpiece to be machined into the machining device.According to a preferred embodiment, a workpiece is picked up in an insertion region by a conveying device, such as a belt, belt or chain conveyor, and moved to a tool of the machining apparatus.Furthermore, the light signal display device can be designed in the form of a display strip which extends along the insertion region and in particular completely covers the latter. However, it is also possible to display or project the information in such a way that it extends partially or completely along the insertion region. In this case, the display bar is understood to mean a narrow elongate display which extends along the insertion region. Since the workpieces are generally inserted horizontally and flatly into the insertion region of the processing machine, it is expedient to provide the display list likewise horizontally and in particular above the insertion region. It is furthermore advantageous if the display strip extends continuously from one side region of the insertion region to another side region of the insertion region, i.e. the display strip completely or substantially completely covers the insertion region. The light signal display device can also be formed by a plurality of display strips.According to a further embodiment of the present invention, the light signal display device can display the wear state of the tool and / or the advantageous insertion position of the workpiece to be machined on the basis of different colors of the operator. The display is effected in particular on the basis of the colors green, yellow and red, wherein green is used for a good state of the tool or a good insertion position, yellow for a medium state of the tool or a medium insertion position and red for a poor state of the tool or a poor insertion position. It is also possible to use color profiles for better visualization.Furthermore, the control device preferably has a workpiece detection device, by means of which the length dimensions of the workpiece and an insertion position of the workpiece in the insertion region of the machining apparatus can be detected, in particular can be detected already before the insertion into the insertion region. The length dimensions of the workpiece to be machined are generally the width and the length of the workpiece. Furthermore, the insertion position is understood to mean the position of the workpiece at which the operator of the machining device has inserted the workpiece into the insertion region.In this way, it is possible to indicate to the operator of the machining device the advantageous insertion position of the current workpiece before the workpiece to be machined is inserted into the insertion region of the machining device. This allows the operator to immediately place the current workpiece to the advantageous insertion position in the machining apparatus, which makes unnecessary re-placement or shifting of the workpiece unnecessary.Furthermore, the control device is configured to determine the wear state of the tool via the engagement time of the tool and to display it to the operator on the basis of the light signal display device.According to a further embodiment of the present invention, the control device determines the wear state of the tool as seen over the engagement time of the tool. The control device determines the wear state on the basis of the detected length dimensions of the machined workpieces and their respective insertion position in the machining device (position in the insertion region) and the respective machining parameters, such as machining time, machining forces, grinding time, contact pressure force etc. This means that the control unit calculates wear of the tool on the basis of the aforementioned parameters, wherein empirically determined empirical values or simulated values are used to determine the wear, and the respectively determined wear is summed to determine a current wear state. The determination of the wear state will be discussed in detail later.It is preferably also possible to set up the control in such a way that the advantageous insertion position is determined stochastically or chaotically. That is, the insertion position is not determined based on the wear state of the tool, but is distributed across the tool surface stochastically or chaotically over the engagement time of the workpiece, so that, statistically, the tool is worn uniformly over the engagement time. Furthermore, the light signal display device can have an inspection device, by means of which a surface condition, such as e.g. a grain direction, of the workpiece to be machined can be determined, and an advantageous insertion position and / or advantageous insertion orientation can be displayed to the operator on the basis of the determined surface condition on the basis of the light signal display device.The light display device can preferably be designed as a projection unit, in particular in the form of a projector.According to a further embodiment of the present invention, the light display device is formed on the basis of an LED strip, an OLED strip and the like, wherein a resolution, i.e. the distance between individual display elements or display sections of the light display device or the division of the display sections at the projected region, is less than 5 cm, in particular less than 2 cm. The light display device is preferably formed on the basis of a strip with spaced-apart LEDs, wherein the resolution corresponds to the distance between the individual LEDs (display elements). Furthermore, the light display device preferably has a 24-bit resolution with which color profiles can be displayed.Furthermore, the at least one tool (WZ) of the processing device can be a grinding belt, a grinding roller, polishing roller, a disk brush or the like. In the case of a plurality of tools, these may comprise one of the tools mentioned. Further preferably, in the case of a plurality of tools, different tools from the mentioned tools are combined, for example one or more calibration roller(s), one or more grinding belts, one or more polishing rollers, one or more disk brushes.Furthermore, the present invention relates to a method for operating a machining device, in particular the machining device described above, wherein the method comprises: determining the wear state of the tool, displaying the determined wear state of the tool by means of a light signal display device, and / or displaying an advantageous insertion position of the workpiece to be machined in the machining device by means of the light signal display device, wherein in particular the advantageous insertion position is determined based on the determined wear state of the tool or stochastically or chaotically, detecting the length dimensions of the workpiece to be machined before the insertion of the workpiece to be machined into the insertion region, checking the current wear state of the tool, determining the advantageous insertion position based on the current wear state of the tool and the detected length dimensions of the workpiece to be machined, and displaying the advantageous insertion position by means of the light signal display deviceAccording to a preferred embodiment of the present invention, the method described above further includes: detecting length dimensions of the workpiece to be machined; detecting the insertion position of the workpiece to be machined in an insertion region of the machining apparatus; checking whether a wear state of the tool has already been determined whenyes, indicating the wear condition by means of the light signal indicating device,no, displaying a wear state corresponding to the state of a new tool by means of the light signal display device,determining wear of the tool based on the detected length dimensions, the detected insertion position and present machining parameters such as machining time, machining forces, grinding time, contact pressure, etc., determining a current wear state by summing a present wear state with the determined wear, and storing the determined current wear state.Furthermore, the method can be used to determine the current wear state of the tool over the engagement time of the tool on the basis of a summation of determined wear of the tool, wherein the respective wear of the tool was determined in each case at the time at which a new workpiece was inserted into the insertion region of the machining apparatus.Brief Description of the DrawingsFIG. 1 shows a schematic perspective illustration of an embodiment of the processing apparatus according to the present invention, FIGS. 2a-2c show various examples of display modes by means of the light signal display device according to an embodiment of the present invention; and FIG. 3 is a flow chart illustrating the individual steps of an embodiment of the method for operating a machining apparatus according to the present invention.DETAILED DESCRIPTION OF PREFERRED EMBODIMENTSPreferred embodiments of the present invention will be described below with reference to the accompanying drawings. Further variants and modifications of individual features mentioned in this context can each be combined with one another in order to form new embodiments.FIG. 1 is a schematic perspective view of an embodiment of the processing apparatus according to the present invention.As can be seen from FIG. 1, according to an embodiment of the present invention, a processing device 2 has at least one light signal display device 10, which is provided on the processing device 2 in such a way that it is easily perceptible by an operator of the processing device 2. In order to be easily perceptible to the operator, as illustrated, the light signal display device 10 is preferably arranged above an insertion region 4 of the processing device 2 in the vertical direction. Thus, during the insertion process of a workpiece W to be machined into the insertion region 4, the light signal display device 10 is directly visible to the operator and is thus easily perceptible. However, it is also possible not to provide the light signal display device directly on the insertion region 4, but to project the information, i.e. for example the degree of wear of the tool WZ or the advantageous insertion position, onto the processing device 2, in particular into the vicinity of the insertion region 4.It can also be seen from FIG. 1 that the light signal display device 10 is preferably designed in the form of a display strip 11 which, in the embodiment shown, extends completely along the insertion region 4. That is, from a right side region of the insertion region 4 as shown to a left side region of the insertion region 4, as the light signal display device 10 extends completely along the insertion region 4, it is ensured that the light signal display device 10 covers the entire length of the tool WZ.In FIG. 1, a wide-belt grinding machine 2 is illustrated as a specific example of a machining apparatus 2. Accordingly, in the illustrated embodiment, the light signal display device 10 covers the entire length of the grinding belt of the wide belt grinding machine 2. Accordingly, it is possible to display a wear state of the grinding belt to an operator over the entire length of the grinding belt by the light signal display device 10. It is likewise possible with the aid of the light signal display device 10 to display to the operator of the wide-belt grinding machine 2 an advantageous insertion position EP V of a workpiece W to be machined in relation to the insertion region 4.As indicated in FIG. 1 and further illustrated in FIGS. 2 a- 2 c, in the case of the proposed light signal display device 10, the ascertained wear state of the tool WZ and / or the advantageous insertion position EP V is displayed to the operator by means of different colors. In order to make the light signal display device 10 self-explanatory, the known colors green (G), yellow (Y) and red (R) are preferably used (FIG. 2 a).It can be seen from FIG. 2 b that it is also possible to design the light signal display device 10 on the basis of two or more display strips 11, which are preferably arranged one above the other. Accordingly, it is possible to display the advantageous insert position EP V to the operator by means of the upper display strip OL and at the same time to display the wear state of the tool WZ to the operator by means of the lower display strip UL. The individual display strips 11 are in turn preferably formed from a plurality of rows of LEDs, wherein the individual rows extend along the insertion region 4.Further, as can be seen from FIG. 2 c, with the light signal display device 10, it is also possible to display urgent information such as a malfunction of the machining device 2 and the like to the operator, thus improving the operability of the machining device 2. In this case, it is also possible, among others, to display recommendations for action, status information and the like to the operator.Returning to FIG. 1, it can be further seen that the machining apparatus 2 has a control device 2 and a workpiece detection device 30. By means of the workpiece detection device 30, which in the exemplary embodiment shown is arranged on the outside of the processing apparatus 2 in such a way that it can completely monitor the insertion region 4, as a result of which the insertion position EP of a workpiece W which has been inserted into the insertion region 4 by the operator can be detected. Furthermore, the workpiece detection device 30 is preferably designed such that it can not only monitor the insertion region 4, but it is also capable of monitoring a region upstream of the insertion region 4. This enables an early detection of a workpiece W to be machined, so that the advantageous insertion position EP V can be displayed to the operator even before the workpiece W is inserted into the insertion region 4.In the embodiment of the present invention illustrated in FIG. 1, the workpiece detection device 30 is designed in the form of an optical detection device, in particular a camera. However, inductive sensors, ultrasonic sensors and optical sensors may also be used. The workpiece detection device 30 can furthermore not only have a camera as illustrated, but if necessary can also be formed from a plurality of cameras and / or a plurality of different sensors.The use of a camera offers the advantage that, if desired, a surface condition of the workpiece W, such as a grain direction, can be detected. In this case, the camera also forms part of an inspection device 40. further information (data) such as, for example, workpiece type, workpiece number and the like can be determined in advance by the workpiece detection device.FIG. 3 shows a flow chart which illustrates the individual steps of an embodiment of the method for operating a processing device 2 according to the present invention.In step one of the method for operating a machining apparatus 2, length dimensions X, Y of the workpiece W are detected by means of the workpiece detection device 30 and are input to the control device 20.In method step two, an insertion position EP of the workpiece to be machined is detected on the basis of sensors in the machining apparatus 2, in particular in the insertion region 4 and / or on the basis of the workpiece detection device 30.Method step three checks whether wear condition data are already present. That is, whether a workpiece W has already been placed in the machining device and machined beforehand and therefore the tool WZ has already been partially worn out. If yes, the process proceeds to step 4. If there is no wear state data, the procedure continues with step 4a.In method step four, the present wear state of the tool WZ is displayed to the operator by means of the light signal display device 10, which provides the operator with the possibility of inserting the workpiece W in the machining device 2 in an optimum manner, so that the tool WZ is used uniformly and thus worn, as seen over the complete engagement time. In method step four, it is also possible to indicate to the operator an advantageous insert position EP V of the workpiece W.In the parallel method step 4 a, it is indicated to the operator 10 by means of the light signal display device 10 that no wear state data are present. This means that the tool WZ is generally a new tool WZ for which no wear state has yet been determined. In general, this is signaled on the basis of a light signal display device which illuminates completely green, which means that there is no wear on the tool WZ.Following the two alternative method steps 4 and 4a is step 5, in which a current wear state is determined. The wear state is a summation of individual wear of the tool WZ, which is determined in each case during the machining of a workpiece W. The wear is determined here on the basis of the detected length dimensions X, Y and the detected insertion position EP and existing machining parameters. Based on the length dimensions X, Y and the detected insertion position EP, it can be determined which specific region of the tool WZ is stressed by the machining carried out and is thus worn out. Furthermore, based on the present machining parameters, such as machining time, machining forces, grinding time, contact pressure, etc., the respective load or wear of the tool WZ can be determined. In sum, it can be determined specifically which region of the tool WZ is worn away to the extent.In this case, it is also possible to determine total wear in a machine having a plurality of units (having different tools WZ). Thus, there is the possibility that certain grinding units are disengaged during the machining of a certain workpiece W, e.g. one of the following mentioned grinding devices: one or more calibration rollers (steel roller and rubberized roller) and / or a fine grinding unit (transverse belt and H-unit). Thus, a common total wear is determined across a plurality of different tools and a total wear state and / or an advantageous insertion position EP V, which takes into account the total wear state, is displayed to the operator by means of the light signal display device 10.It is also possible to indicate the degree of wear of individual grinding units separately.Furthermore, it is also possible, in the case of a processing device 2 with a plurality of units, such as, for example, in the case of a wide-belt grinding machine with four units, to provide a separate light display device, in particular an LED strip, for each unit. The four units can be, for example, two calibration rollers and two grinding belts (pre- and fine grinding). In this way, the possibility is created of indicating to the operator for each individual unit a determined degree of wear and an advantageous insertion position EP V.For example, the degree of wear of all units can first be displayed individually to an operator at the same time. If the operating mode is now switched on and / or a workpiece is inserted, which is to be processed by three units, for example, total wear and an advantageous insertion position EP V can be displayed to the operator taking into account the degrees of wear of all three units. For this purpose, the degrees of wear of the three aggregates are calculated with one another and a total value is formed.However, it is also possible to display all three degrees of wear separately to the operator and to leave it to the operator where he ultimately inserts the workpiece.Furthermore, it is possible to realize the same function only with the aid of a light display device, in which case individual horizontal lines of the light display device, in particular of the LED strip, would display the different degrees of wear.Next, in step six, the ascertained current wear state of the tool WZ of the machining device 2 is stored in a database, so that upon a next machining of a new workpiece W, it can be used to resort to this. With step six, the method for operating a processing device 2 is finished and returns to the initial position (step 1).

Claims

Processing device (2), in particular a wide-belt grinding machine, for processing preferably plate-shaped workpieces (W) which preferably consist at least in sections of wood, wood material and / or plastic, comprising a control device (20) and at least one light signal display device (10) which displays on the processing device (2) information such that the information displayed by the light signal display device (10) is perceptible to an operator, wherein the control device (20) is configured to control the light signal display device (10) such that the operator is displayed as the information a wear state of at least one tool of the processing device (2) and / or an advantageous insertion position (EP V) of a workpiece (W) to be processed, and wherein the control device (20) is further configured to, On the basis of the ascertained wear state of the tool and on the basis of detected length dimensions of the workpiece (W) to be machined, the advantageous insertion position (EP V) of the workpiece (W) to be machined is determined and displayed to the operator on the basis of the light signal display device (10).Machining device (2) according to claim 1, in which the light signal display device (10) is provided on an insertion region (4) of the machining device (2), on which the workpiece (W) to be machined can be inserted and / or moved to the tool by means of a conveying device, or the light signal display device (10) displays the information on the insertion region (4), wherein it is preferred that the light signal display device (10) is arranged above the insertion region (4) in the vertical direction or displays the information at this position.Processing device (2) according to claim 2, wherein the light signal display device (10) is in the form of a display bar (11), which extends partially or completely along the insertion region (4), or the information is displayed in such a way that it extends partially or completely along the insertion region (4).Machining device (2) according to one of the preceding claims, in which the light signal display device (10) can display the wear state of the tool and / or the advantageous insertion position (EP V) of the workpiece (W) to be machined on the basis of different colors of the operator, in particular on the basis of the colors green, yellow and red, wherein green is used for a good state or a desired position, yellow is used for a medium state or a less desired position and red is used for a poor state or an undesirable position, further preferably color profiles can also be used for display.Processing device (2) according to one of the preceding claims, further comprising a workpiece detection device (30), by means of which the length dimensions of the workpiece (W) and an insertion position (EP) of the workpiece (W) in the insertion region (4) of the processing device (2) can be detected, in particular can be determined already before the insertion into the insertion region (4).Machining device (2) according to one of the preceding claims, wherein the control device (20) is configured to determine the wear state of the tool by means of an engagement time (t) of the tool and to display it to the operator by actuating the light signal display device (10).Machining device (2) according to one of the preceding claims, in which the control device (20) determines the wear state of the tool over the engagement time (t) of the tool on the basis of the detected length dimensions of the machined workpieces (W) and their respective insertion position in the machining device (2) and the respective machining parameters, in particular machining duration, machining forces, grinding duration, contact pressure force and the like.Processing device (2) according to one of the preceding claims, in which the control device (20) is configured to determine the advantageous insertion position (EP V) stochastically or chaotically.Processing device (2) according to one of the preceding claims, in which an inspection device (40) is further provided, which is configured to determine a surface condition, such as a grain direction, of the workpiece (W) to be processed and to display an advantageous insertion position (EP V) and / or advantageous insertion orientation to the operator on the basis of the determined surface condition on the basis of the light signal display device (10).Processing device (2) according to one of the preceding claims, in which the light display device (10) is designed as a projection unit, in particular in the form of a projector.Processing device (2) according to one of Claims 1 to 9, in which the light display device (10) is designed as an LED strip, OLED strip or the like, it being preferred for a resolution of the light display device to be less than 5 cm, in particular less than 2 cm.Processing device (2) according to one of the preceding claims, in which the at least one tool is a grinding belt, a grinding roller, a polishing roller, a disk brush or the like.Method for operating a machining device (2), in particular the machining device (2) according to one of Claims 1 to 12, wherein the method comprises: - determining the wear state of a tool of the machining device (2), - displaying the determined wear state of the tool by means of a light signal display device (10), and / or - displaying an advantageous insertion position (EP V) of the workpiece (W) to be machined in the machining device (2) by means of the light signal display device (10), wherein in particular the advantageous insertion position (EP V) is determined on the basis of the determined wear state of the tool or stochastically or chaotically, wherein the method further comprises: - detecting length dimensions of the workpiece (W) to be machined before the insertion of the workpiece (W) to be machined into the insertion region (4), testing the current wear state of the tool, ascertaining the advantageous insertion position (EP V) based on the current wear state of the tool and the detected length dimensions of the workpiece (W) to be machined, displaying the advantageous insertion position (EP V) by means of the light signal display device (10).Method according to claim 13, wherein the method further comprises: - detecting length dimensions of the workpiece (W) to be machined, - detecting the insertion position (EP) of the workpiece (W) to be machined in an insertion region (4) of the machining device (2), checking whether a wear state of the tool has already been determined, - determining wear of the tool based on the detected length dimensions of the detected insertion position (EP) and present machining parameters, such as machining time, machining forces, grinding time, contact pressure force, - determining a current wear state by summing a present wear state with the determined wear, and - storing the determined current wear state.Method according to Claim 14, in which, over the engagement time (t) of the tool, the current wear state of the tool is determined on the basis of a summation of determined wear of the tool.Use of at least one light signal display device (10) which is attached to the machining device (2) according to one of Claims 1 - 12 or displays information thereon in order to display to an operator a wear state of at least one tool of the machining device (2) and / or an advantageous insertion position (EP V) of a workpiece (W) to be machined.

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