Method for assessing the wear condition of a component of a rotary press and rotary press

Abstract

Method for assessing the wear condition of a component of a rotary press, wherein the rotary press comprises a rotor which is rotatable by means of a rotary drive, wherein the rotor has an upper punch guide (18) for upper press punches (14) and a lower punch guide (20) for lower press punches (16) as well as a die plate (10) arranged between the punch guides, wherein the press punches (14, 16) interact with cavities (12) of the die plate (10), wherein the rotary press further comprises a filling device (26) by means of which powder material to be pressed is filled into the cavities (12) of the die plate (10), wherein the rotary press comprises a pressure device (34) which, during operation, interacts with the upper press punches (14) and with the lower press punches (16) for pressing the powder material in the cavities (12) of the die plate (10) to form compacts, and wherein the rotary press is provided with Stamp heads of the press stamps (14,16) has cooperating control cams for controlling an axial movement of the press punches (14, 16), wherein the control cams comprise an ejector cam (56) which controls the lower press punches for ejecting compacts produced in the cavities (12) from the cavities (12), the method being characterized by the following steps: , • with at least one force sensor (64) arranged on the ejector cam (56), ejection forces acting on the ejector cam (56) are measured as measured values during operation of the rotary press, and with at least one vibration sensor (58, 60, 62) arranged on the ejector cam (56), vibrations occurring during operation of the rotary press are measured as measured values, • the measured values are fed to an evaluation device (52) and the evaluation device (52) evaluates the wear condition of the ejector cam (56) of the rotary press on the basis of the measured values obtained.

Description

[0001] The invention relates to a method for assessing the wear condition of a component of a rotary press, wherein the rotary press comprises a rotor rotatable by means of a rotary drive, wherein the rotor has an upper punch guide for upper press punches and a lower punch guide for lower press punches as well as a die plate arranged between the punch guides, wherein the press punches interact with cavities of the die plate, wherein the rotary press further comprises a filling device by which powder material to be pressed is filled into the cavities of the die plate, wherein the rotary press comprises a pressure device which, during operation, interacts with the upper press punches and with the lower press punches to press the powder material in the cavities of the die plate into compacts,and wherein the rotary press has control cams cooperating with punch heads of the press punches for controlling an axial movement of the press punches, wherein the control cams comprise an ejector cam which controls the lower press punches for ejecting compacts produced in the cavities from the cavities.

[0002] The invention also relates to a rotary press, comprising a rotor with an upper punch guide for upper press punches and a lower punch guide for lower press punches as well as a die plate arranged between the punch guides, wherein the press punches interact with cavities of the die plate, further comprising a filling device by means of which powder material to be pressed is filled into the cavities of the die plate, further comprising a pressure device which, during operation, interacts with the upper press punches and with the lower press punches for pressing the powder material in the cavities of the die plate into compacts, and further comprising control cams which interact with punch heads of the press punches for controlling an axial movement of the press punches, wherein the control cams comprise an ejector cam which controls the lower press punches for ejecting compacts produced in the cavities from the cavities.

[0003] Rotary presses usually have a multitude of upper and lower press punches, each paired with a cavity in a die table. During operation of the rotary press, the upper and lower press punches rotate together with the die table, with their axial movement controlled by control cams and guided by upper and lower punch guides. As it rotates, the die table passes through various devices on the rotary press, namely a filling device, in which powder material to be pressed is fed into the cavities of the die table, and a pressure device, in which the upper and lower press punches are pressed into the cavities, usually by upper and lower pressure rollers, to compress the powder material into pellets, such as tablets.Following the pressure device, the upper press rams are guided upwards out of the cavities, and the compacts produced in the cavities are pushed onto the upper side of the die plate by the lower press rams. Ejector cams are provided for this purpose, which move the lower press rams upwards accordingly. The compacts are then stripped from the die plate, for example, by a stripper, into an exit of the rotary press, from where they are fed for further processing.

[0004] Rotary presses operate at high rotor speeds and correspondingly high production speeds. The high number of pressing cycles results in wear on various components of the rotary press, particularly the control cams, and in particular the ejector cams, which are subject to particular stress due to contact with the press rams. Contact with the powder material being pressed can also lead to corresponding wear. Components with increased wear can lead to a deterioration in the quality of the pressed tablets. For example, ejector cams with increased wear can lead to defects not being detected during sorting, and defective tablets not being sorted out.Until now, the wear condition of many components of the rotary press, especially the ejector cams, has been checked at specified maintenance intervals, usually manually by an operator. The disadvantage of this is that wear that occurs in the meantime, which could already lead to a deterioration in tablet quality, may not be detected in a timely manner. Manual wear monitoring is also complex and not reliably reproducible.

[0005] WO 2021 / 058516 A1 relates to a device and a method for monitoring a tabletting machine using a measuring device attached to a press ram. The measuring device is energy-autonomous and operates independently of the power supply of the tabletting machine. The measuring device has a sensor that records physical or chemical properties. The measured values recorded as raw data are processed by a computing unit of the measuring device, and the processed measured values are sent via a communication unit of the measuring device to a programmable logic controller of the tabletting machine and / or data processing unit and / or saved on the memory unit of the measuring device.

[0006] WO 2012 / 152373 A1 describes a device and a method for calibrating and adjusting a measuring device of a tablet press. A reference measuring device is provided, a plurality of reference measurement events are generated, and the associated measured values of the measuring device and the reference measuring device are recorded and compared with each other. If an unacceptable deviation between the compared measured values occurs, the measuring device is adjusted.

[0007] DE 199 52 834 A1 describes a method for monitoring the operation of a press, in which a measurement of the associated vibration activity present in the press during each press cycle is created for several press operating events. For this purpose, a corresponding vibration measurement signal is generated. The vibration measurement signals are processed to identify the presence of a vibration trend and thereby meet defined trend criteria.

[0008] Based on the prior art explained above, the object of the invention is therefore to provide a method and a rotary press of the type mentioned at the outset with which the wear condition of components of the rotary press can be assessed reliably, in a timely and reproducible manner.

[0009] The invention solves the problem by the independent claims 1 and 11. Advantageous embodiments can be found in the dependent claims, the description and the figures.

[0010] For a method of the type mentioned above, the invention solves the problem by the following steps: • With at least one force sensor arranged on the ejector cam, the ejection forces acting on the ejector cam during operation of the rotary press are measured as measured values and with at least one vibration sensor arranged on the ejector cam, vibrations occurring during operation of the rotary press are measured as measured values, • the measured values are fed to an evaluation device and the evaluation device evaluates the wear condition of the ejector cam of the rotary press on the basis of the measured values obtained.

[0011] For a rotary press of the type mentioned above, the invention solves the problem by • that the rotary press comprises at least one force sensor arranged on the ejector cam, with which the ejection forces acting on the ejector cam during operation of the rotary press can be measured as measured values, and that the rotary press comprises at least one vibration sensor arranged on the ejector cam, with which the vibrations occurring during operation of the rotary press can be measured as measured values, and • that an evaluation device is provided to which the measured values are applied and which is designed to evaluate the wear condition of the ejector cam of the rotary press on the basis of the measured values obtained.

[0012] The basic structure of the rotary press, as it is the subject of the present invention or is used in the method according to the invention, was explained at the beginning. As explained, the upper and lower punch guides guide the press punches during their axial movement. The punch heads interact with control cams which move the press punches in the axial direction as they rotate with the rotor, in particular towards and away from each other. The control cams are usually made up of several control cam elements. They can accommodate the punch heads in corresponding guide receptacles or only rest against a mirror surface of the punch heads. The pressure device usually comprises an upper pressure roller and a lower pressure roller which interact with the punch heads of the upper and lower press punches, respectively. Several pressure devices of this type can also be provided, for example pre-pressure devices and main pressure devices.The ejector cam, as part of the control cams, moves the lower press punches upwards after the pellets have been produced in the respective cavity, so that the respective pellet reaches the top of the die plate, from where it can be guided into a tablet outlet, for example by a scraper arranged stationary above the die plate.

[0013] According to the invention, the ejection forces acting on the ejector cam are measured as measured values during operation of the rotary press using at least one force sensor, and the vibrations occurring during operation of the rotary press are measured using at least one vibration sensor. The measured values are fed to an evaluation device. The evaluation device assesses the wear status of a component of the rotary press on the basis of the measured values obtained. This component is the ejector cam. The invention is based on the finding that wear of a component of the rotary press is indicated in particular by a change in the ejection forces on the ejector cam and / or a change in the vibrations occurring during operation of the rotary press.A combined measurement is provided in which both the ejection forces measured with a force sensor and the vibrations measured with a vibration sensor are recorded as measured values and evaluated by the evaluation device. By recording both types of measured values, they can be evaluated in the manner explained above and below. For example, by comparing the recorded values.

[0014] When measured values are compared with reference values, the measured values for the ejection forces are compared with reference values for the ejection forces, and the measured values for the vibrations are compared with reference values for the vibrations. The wear condition can then be assessed based on both types of measured values. For example, increased wear on a component can be identified if one or both types of recorded measured values deviate from the corresponding reference values. When both types of measured values are recorded and evaluated, factors influencing one of the measured values can be taken into account or eliminated, for example, which lead to a change in the corresponding measured values but not due to a change in the wear condition.Examples include a change in the web height, i.e., the height of the compacts produced in the cavities, or the immersion depth of the press rams, particularly the upper press rams, into the cavities or the lower press rams when ejecting the compacts from the cavities, which particularly affect the ejection forces. By additionally considering the vibration signals, such influencing factors not related to the wear condition can be identified and eliminated.

[0015] The evaluation device can be part of the rotary press. For example, the evaluation device can be integrated into the rotary press's machine control system. However, it can also be implemented separately from the rotary press, for example, on a computer, tablet, or smartphone separate from the rotary press, or on a server separate from the rotary press, for example, as part of a cloud solution.

[0016] The invention allows a prediction of the degree of wear on components of the rotary press, particularly in real time. This is achieved simply and reliably by using measurement signals for the ejection force on the ejector cam and for vibrations of the rotary press. Because the inventive assessment of the wear status can be carried out independently of maintenance intervals, particularly continuously during operation of the rotary press, increased wear can be detected in a timely manner. Process stability is increased, and unplanned downtimes of the rotary press are minimized. At the same time, the quality characteristics of the produced pressed parts can be sustainably optimized. The inventive assessment is independent of individual operator assessments and is therefore reliably and objectively reproducible.

[0017] The evaluation device may have an input device and / or a display device. These may be integrated into the evaluation device or configured separately, for example, in a PC, tablet, or smartphone, particularly via an app (application).

[0018] The measured values recorded according to the invention are particularly suitable for assessing the wear condition of the ejector cam. The ejector cam is also relevant for assessing the wear condition, as there has been no automatic monitoring of the condition of the ejector cam to date. Only a manual check is performed within the framework of specified maintenance intervals. According to the invention, it has been recognized that wear of the ejector cam can be reliably detected using the ejection force and vibration signals.

[0019] The force sensor that records the ejection force is located on the ejector cam. Currently, corresponding force sensors for measuring the ejection force are often located on the ejector cams. However, these have not yet been used for wear detection. A force transducer, for example, can be mounted on the ejector cam as a force sensor. The force transducer can, for example, be a

[0020] Bending beams with strain gauges and, if necessary, an integrated measuring amplifier. The force transducer, located below the ejection curve, is deflected by the forces transmitted by the ejected punch. Based on this deflection, the ejection force can be determined.

[0021] According to the invention, a vibration sensor is arranged on the ejector cam. Furthermore, a vibration sensor can be arranged on the pressure device, in particular on an upper and / or lower pressure roller of the pressure device and / or on an upper and / or lower holder of the upper and / or lower pressure roller, and / or on a metering cam of the control cams for metering the powder material filled into the cavities of the die plate. Thus, one or more vibration sensors can be provided to record the vibrations occurring during operation of the rotary press as measured values. For example, a vibration sensor on the ejector cam, for example on a force transducer, for example on a bending measuring beam of a force transducer, directly measures the vibrations occurring on the ejector cam and can thus provide particularly direct information about the wear status of the ejector cam.However, the inventors discovered that vibration signals from metering cam elements—i.e., control cam elements that control (meter) the height of the lower punches when filling the cavities with powder material—and from pressure rollers of the pressure device also provide information about the wear status of components located elsewhere in the rotary press, particularly the ejector cam. The arrangement and use of multiple vibration sensors may also be useful. In this way, other effects that may not be relevant to the wear status can be identified and eliminated from the evaluation.

[0022] The measured values can be recorded as a measured value curve, particularly as a time-dependent measured value curve. For example, the measured values can be recorded as a measured value curve plotted against time, speed, or acceleration. The measured values can be plotted as a measured value curve by the force or vibration sensors, or individual measured values provided by the force or vibration sensors can be recorded by the evaluation device to form corresponding measured value curves. Particularly reliable information about the wear status of the component can be obtained from a change, particularly in the temporal progression of the recorded measured values.

[0023] In a particularly practical way, the wear condition of the component can be assessed by the evaluation device based on a comparison of the measured values obtained with reference values. Suitable reference values can be, for example, measured values during operation of the rotary press for a new corresponding component, e.g. a new output curve. These reference values form target values with which the measured values obtained later during operation of the rotary press can be compared. The reference values can be historical data for the rotary press being assessed or data stored in a database, for example for the type of rotary press in question. By determining any deviation between the currently recorded measured values and the reference values, conclusions can be drawn about the wear condition of the respective component.The influence of other factors not relevant to the wear condition, such as the web height or the plunger depth, can be eliminated mathematically or by measurement, as already explained. Especially when recording the measured values as measured value curves, these can be compared with reference value curves.

[0024] According to a further embodiment, it can be provided that the evaluation device detects increased wear of the component if there is a shift in the obtained measured values compared to the reference values and / or a change in the amplitude of the obtained measured values compared to the reference values and / or a change in the gradient of the obtained measured values compared to the reference values. It has been recognized that a temporal shift, in particular, of the high-frequency vibration signal or the high-frequency ejection force signal correlates with the degree of wear of an ejector cam of the rotary press. In addition to the shift, the height or shape of maxima in the high-frequency vibration or ejection force signal is also a parameter indicating the state of wear.For example, with regard to the ejector curve, wear caused by frequent, force-intensive contact with punch heads changes the impact angle of the press punches on the ramp-like ejector curve. This leads to a corresponding shift or altered shape of the maxima in the corresponding measured value curves. Wear of the ejector curve can also be detected by a change in the acceleration and the amplitude of the vibration signal and / or the ejection force signal. This can also be taken into account by the evaluation device in the manner described.

[0025] According to a further embodiment, the evaluation device can detect increased wear of the component if the measured values obtained deviate from the reference values by at least one predetermined limit value. The at least one predetermined limit value can be specified and / or adjusted by an operator. Alternatively or additionally, the at least one predetermined limit value can be specified and / or adjusted by an algorithm, in particular a machine learning algorithm. Corresponding limit values can therefore be specified not only by an operator but also by software or can be defined process-specifically using reference values for new components, for example new ejector curves. Predefined limit values can also be optimized or adjusted using machine learning algorithms, in particular self-learning algorithms.An operator can enter the limit values, for example, via an input device on the evaluation unit or adjust them according to specific needs. Machine learning algorithms can, in particular, include neural networks.

[0026] The evaluation device can display the results of the component wear assessment to an operator. Furthermore, the evaluation device can issue a warning message if it detects excessive wear on the component. The evaluation results or warning message can be displayed via the aforementioned display device of the evaluation device. The warning message can also include a suggestion for cleaning and / or retreatment and / or replacement of the component with excessive wear.

[0027] The rotary press, in particular the evaluation device, can be designed to carry out the method according to the invention. Accordingly, the method according to the invention can be carried out using the rotary press according to the invention.

[0028] An embodiment of the invention is explained in more detail below with reference to the figures. They show schematically: Fig. 1 a rotary press according to the invention in a developed representation of the rotor, Fig. 2 a first diagram illustrating the method according to the invention, Fig. 3 shows a further diagram illustrating the method according to the invention, Fig. 4 shows a further diagram illustrating the method according to the invention, Fig. 5 shows a further diagram illustrating the method according to the invention,

[0029] Unless otherwise stated, the same reference symbols in the figures refer to the same objects.

[0030] The Fig. The rotary press shown in Figure 1 is a rotary press for tablet production in which powdered material is compressed into tablets. The rotary press comprises a rotor driven in rotation by a rotary drive and having a die plate 10 having a plurality of cavities 12. The cavities 12 can be formed, for example, by bores in the die plate 10. The rotor further comprises a plurality of upper press punches 14 and lower press punches 16 that rotate synchronously with the die plate 10. The upper press punches 14 are axially guided in an upper punch guide 18, and the lower press punches 16 are axially guided in a lower punch guide 20. The axial movement of the upper press punches 14 and lower press punches 16 during the rotation of the rotor is controlled by upper control cam elements 22 and lower control cam elements 24.The rotary press further comprises a filling device 26, which has a filling reservoir 28 and a filling chamber 30, which are connected via a filling pipe 32. In this way, in the present example, powder material flows from the filling reservoir 28 via the filling pipe 32 into the filling chamber 30 due to gravity, and from there, via a filling opening provided on the underside of the filling chamber 30, into the cavities 12 of the die plate 10 due to gravity.

[0031] The rotary press also comprises a printing device 34. The printing device 34 comprises a pre-pressing device with an upper pre-pressing roller 36 held on an upper holder 35 and a lower pre-pressing roller 38 held on a lower holder 37, as well as a main printing device with an upper pressure roller 40 held on an upper holder 39 and a lower pressure roller 42 held on a lower holder 41. In addition, the rotary press comprises an ejection device 44 and a stripping device 46 with a stripping element which feeds the tablets 48 produced in the rotary press to a discharge device 50 for removal from the rotary press.The stripping device 46 can, for example, comprise a preferably sickle-shaped stripping element which, in the region of the ejection device 44, strips tablets 48 conveyed by the lower press punches 16 onto the upper side of the die plate 10 from the die plate 10 and feeds them to the discharge device 50.

[0032] Furthermore, the rotary press comprises an evaluation device 52 for controlling the operation of the rotary press and for carrying out the method according to the invention, as explained in more detail below.

[0033] The control cams 24 comprise various control cam elements, including a metering cam 54 and an ejector cam 56. In the example shown, vibration sensors 58, 60, 62 are arranged on the metering cam 54, the upper and lower mounts 39, 41 of the upper and lower pressure rollers 40, 42, and on the ejector cam 56. The vibration sensors 58, 60, 62 measure vibrations occurring during operation of the rotary press at the respective components on which they are arranged. In addition, a force sensor 64 is arranged on the ejector cam 56 for measuring the ejection forces acting on the ejector cam 56 by the press rams 14, 16 during operation of the rotary press. The measured values recorded during operation of the rotary press by the vibration sensors 58, 60, 62 and the force sensor 64 are recorded as measured value curves and fed to the evaluation device 52.Based on the measured value curves obtained, the evaluation device 52, in the example shown, assesses the wear condition of the ejector cam 56 of the rotary press. Results of the assessment or a warning message in the event of increased wear can be output via a display device of the evaluation device 52. This display device can be integrated into the evaluation device 52 or, for example, be formed by a computer, a tablet, or a smartphone. The evaluation device 52 also comprises an input device via which an operator can enter parameters for the condition assessment of the evaluation device 52, such as limit values for deviations from reference value curves. The input device can also be integrated into the evaluation device 52 or be formed separately from it, for example on a computer, a tablet, or a smartphone.

[0034] In the example shown, the evaluation device 52 compares the recorded measured value curves of the vibration sensors 58, 60, 62 and the force sensor 64 with reference value curves, which may, for example, have been created experimentally using a new and therefore unworn ejector cam 56. The reference value curves may have been created for the rotary press to be evaluated or for another rotary press of the same type. In particular, the evaluation device 52 can determine increased wear of the ejector cam 56 if, for example, there is a temporal shift in the obtained measured value curves compared to the reference value curves and / or a changed amplitude of the obtained measured value curves compared to the reference value curves, in particular a changed maximum, and / or a changed gradient of the obtained measured value curves compared to the reference value curves, in particular a changed gradient of amplitudes or maxima.

[0035] This should be shown using the diagrams of the Fig. 2 to 5 are explained as examples. In Fig. 2, reference numeral 66 represents the vibration frequency of the vibrations occurring during operation of the rotary press, as measured by the vibration sensor 62 arranged on the ejector cam 56, plotted against the vibration acceleration, in any desired units. Corresponding reference values are shown in Fig. 2 at reference numeral 68. It can be seen that, on the one hand, the amplitude or maximum of the vibration signals measured by the vibration sensor 62 is higher than the reference values, and, furthermore, the vibration acceleration is lower. These deviations of the recorded measured values from the reference values are compared by the evaluation device 52 with correspondingly predetermined limit values. If the deviations exceed the limit values, the evaluation device 52 evaluates the ejector curve 56 as showing increased wear.

[0036] Fig. 3 shows a Fig. 2, wherein in this case, at reference numeral 70, the measured values recorded by the vibration sensor 58 arranged on the dosing curve 54 are compared with corresponding reference values, plotted at reference numeral 72. An overlap between the curves 70 and 72 is shown cross-hatched. Fig. 2 Deviations are also visible in Fig. 3, although less pronounced due to the arrangement of the vibration sensor 58 on the dosing curve 54. In the same way as Fig. 2, the evaluation device 52 can also evaluate the wear condition of the ejector cam 56 on the basis of the measured values of the vibration sensor 58.

[0037] Fig. 4 shows a Fig. 2 and Fig. 3 shows a slightly modified diagram for measured values recorded by the vibration sensor 60 arranged on the upper pressure roller 40. Thus, in Fig. 4 the vibration frequency is plotted against the vibration speed, again in arbitrary units. The measured values recorded by the vibration sensor 60 are represented by reference numeral 74. Corresponding reference values for a new ejector curve 56 are represented by reference numeral 76. An overlap between curves 74 and 76 is again shown cross-hatched. Again, the evaluation device 52 detects deviations between the measured values that can be compared with corresponding limit values. For example, the frequency amplitude or the frequency maximum of the measured values 74 is again higher than the reference values 76. Furthermore, the vibration speed is greater than the reference values. By comparing these values with correspondingly specified limit values, the evaluation device 52 can determine increased wear.

[0038] In Fig.5, reference numeral 78 represents a measured value curve of the ejection forces recorded by the force sensor 64 arranged on the ejector curve 56 over time, and reference numeral 80 represents a corresponding reference value curve for a new ejector curve 56. It is clearly visible that there is a temporal shift in the measured value curve 78 recorded by the force sensor 64 compared to the reference value curve 80. The amplitude of the measured value curves, however, does not change significantly. Again, a limit value for the temporal shift of the measured value curve 78 compared to the reference value curve 80 can be specified, and the evaluation device 52 can use this as a basis to determine increased wear on the ejector curve 56.

[0039] Although the invention has been explained using the exemplary embodiment for evaluating the wear condition of the ejector cam 56, it is understood that other components of the rotary press can also be evaluated accordingly with regard to their wear condition. List of reference symbols 10 die disc 12 cavities 14 Upper press ram 16 Lower press ram 18 Upper punch guide 20 Lower punch guide 22 Upper control cam elements 24 Lower control cam elements 26 Filling device 28 Filling reservoir 30 filling chamber 32 filling tube 34 Printing device 35 Upper bracket 36 Upper pre-print roller 37 Lower bracket 38 Lower pre-print roller 39 Upper bracket 40 Upper pressure roller 41 Lower bracket 42 Lower pressure roller 44 Ejection device 46 Scraper device 48 tablets 50 Drainage device 52 Evaluation device 54 Dosing curve 56 Ejector curve 58 Vibration sensor 60 Vibration sensor 62 Vibration sensor 64 force sensor 66 measured values 68 reference values 70 measured values 72 reference values 74 measured values 76 reference values 78 measured values 80 reference values

Claims

[1] Method for assessing the wear condition of a component of a rotary press, wherein the rotary press comprises a rotor rotatable by means of a rotary drive, wherein the rotor has an upper punch guide (18) for upper press punches (14) and a lower punch guide (20) for lower press punches (16) as well as a die plate (10) arranged between the punch guides, wherein the press punches (14, 16) interact with cavities (12) of the die plate (10), wherein the rotary press further comprises a filling device (26) by which powder material to be pressed is filled into the cavities (12) of the die plate (10), wherein the rotary press comprises a pressure device (34) which, during operation, interacts with the upper press punches (14) and with the lower press punches (16) for pressing the powder material in the cavities (12) of the die plate (10) to form compacts, and wherein the Rotary press with punch heads of the press punches (14,16) has cooperating control cams for controlling an axial movement of the press punches (14, 16), wherein the control cams comprise an ejector cam (56) which controls the lower press punches for ejecting compacts produced in the cavities (12) from the cavities (12), the method being characterized by the following steps: • with at least one force sensor (64) arranged on the ejector cam (56), ejection forces acting on the ejector cam (56) are measured as measured values during operation of the rotary press, and with at least one vibration sensor (58, 60, 62) arranged on the ejector cam (56), vibrations occurring during operation of the rotary press are measured as measured values, • the measured values are fed to an evaluation device (52) and the evaluation device (52) evaluates the wear condition of the ejector cam (56) of the rotary press on the basis of the measured values obtained. [2] Method according to claim 1, characterized by that a vibration sensor (58, 60, 62) is further arranged on the printing device (34), in particular a pressure roller (40, 42) of the printing device (34) and / or a holder (39, 41) of a pressure roller (40, 42) of the printing device (34), and / or on a metering cam (54) of the control cams for metering the powder material filled into the cavities (12) of the die plate (10). [3] Method according to one of the preceding claims, characterized by that the measured values are recorded as a measured value curve, in particular as a time-dependent measured value curve. [4] Method according to one of the preceding claims, characterized by that the wear condition of the component is evaluated by the evaluation device (52) on the basis of a comparison of the measured values obtained with reference values. [5] Method according to claim 4, characterized bythat the evaluation device (52) detects increased wear of the component in the event of a shift in the measured values obtained compared to the reference values and / or in the event of a changed amplitude of the measured values obtained compared to the reference values and / or in the event of a changed gradient of the measured values obtained compared to the reference values. [6] Method according to one of claims 4 or 5, characterized by that the evaluation device (52) detects increased wear of the component if the measured values obtained deviate from the reference values by at least a predetermined limit value. [7] Method according to claim 6, characterized by that the at least one predetermined limit value is specified and / or adjusted by an operator and / or that the at least one predetermined limit value is specified and / or adjusted by an algorithm, in particular a machine learning algorithm. [8] Method according to one of the preceding claims, characterized by that the evaluation device (52) displays results of the assessment of the wear condition of the component to an operator. [9] Method according to one of the preceding claims, characterized by that the evaluation device (52) issues a warning message when it detects increased wear of the component. [10] Method according to claim 9, characterized by that the warning message includes a suggestion for cleaning and / or re-treatment and / or replacement of the component with increased wear. [11] Rotary press, comprising a rotor with an upper punch guide (18) for upper press punches (14) and a lower punch guide (20) for lower press punches (16) as well as a die plate (10) arranged between the punch guides, wherein the press punches (14, 16) interact with cavities (12) of the die plate (10), further comprising a filling device (26) by means of which powder material to be pressed is filled into the cavities (12) of the die plate (10), further comprising a pressure device (34) which, during operation, interacts with the upper press punches (14) and with the lower press punches (16) for pressing the powder material in the cavities (12) of the die plate (10) to form compacts, and further comprising control cams interacting with punch heads of the press punches (14, 16) for controlling an axial movement of the press punches (14, 16), wherein the Control cams comprise an ejector cam (56),which control the lower press punches (16) for ejecting compacts produced in the cavities (12) from the cavities (12), , characterized by , • that the rotary press comprises at least one force sensor (64) arranged on the ejector cam (56), with which ejection forces acting on the ejector cam (56) during operation of the rotary press can be measured as measured values, and that the rotary press comprises at least one vibration sensor (58, 60, 62) arranged on the ejector cam (56), with which vibrations occurring during operation of the rotary press can be measured as measured values, and • that an evaluation device (52) is provided to which the measured values are applied and which is designed to evaluate the wear condition of the ejector cam (56) of the rotary press on the basis of the measured values obtained. [12] Rotary press according to claim 11, characterized bythat a vibration sensor (58, 60, 62) is further arranged on the printing device (34), in particular a pressure roller (40, 42) of the printing device (34), and / or on a metering cam (54) of the control cams for metering the powder material filled into the cavities (12) of the die plate (10). [13] Rotary press according to one of claims 11 or 12, characterized by that the rotary press, in particular the evaluation device (52), is designed to carry out the method according to one of claims 1 to 10.

Images