• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for operating a CNC machine (1) for machining a dental workpiece (2), wherein - when the CNC machine (1) is operated in a machining mode (BM) - the dental workpiece clamped in a clamping device (3) 2) by a processing device (4) of the CNC machine (1) is processed, wherein - when the CNC machine (1) is operated in a calibration (KM) - based on a test body (5) at least one calibration parameter (K) CNC machine (1) checked and at least one correction value (Q) is set, wherein the CNC machine (1) in the processing mode (BM) in dependence of the at least one correction value (Q) is operated.
    公开号:AT518176A4
    申请号:T50529/2016
    申请日:2016-06-09
    公开日:2017-08-15
    发明作者:Steger Heinrich
    申请人:Steger Heinrich；
    IPC主号:
    专利说明:

    The invention relates to a method for operating a CNC machine for machining a dental workpiece, wherein the dental workpiece clamped in a clamping device is processed by a machining device in a machining mode of the CNC machine. In addition, the invention relates to a CNC machine for machining a dental workpiece, with a clamping device for clamping the dental workpiece, a processing device for processing the dental workpiece and a control or regulating unit for controlling or regulating movements of the CNC machine, wherein in a processing mode of the Control or regulating unit, the dental workpiece is machinable.
    Dental technicians have been using CNC machines for many years for the manufacture and processing of dental workpieces (eg dentures, implants, abutments, dental models, etc.). CNC stands for Computerized Numerical Control. Such machines may be operated in a machining mode in which a clamped dental workpiece is processed based on computer-aided manufacturing (CAM). This is usually done in the form of a machining by a clamped in the processing machine processing tool in the form of a milling cutter, drill, grinder or the like. In recent years, generative processes have become more and more established.
    The accuracy in the production of such CNC machines are limited. Among other things, games must be present especially between the moving parts, so that they can be mounted. As a result, it can happen that machine axes are not aligned at an ideal 90 ° angle to each other. Also tolerances of the machine parts play a role in the accuracy of the final parts to be manufactured. Under these hardly to be prevented fluctuations or inaccuracies also suffers the quality of the processed dental workpiece.
    The object of the present invention is therefore to provide a comparison with the prior art improved method or an improved CNC machine. In particular, the mentioned disadvantages should be eliminated.
    This is achieved by a method having the features of claim 1. Accordingly, according to the invention, it is provided that, in a calibration mode, at least one calibration parameter of the CNC machine is checked on the basis of a test object and at least one correction value is determined, wherein the CNC machine is operated in the edit mode as a function of the at least one correction value. In other words, this means that each CNC machine can be calibrated before or with the first commissioning. In particular, at least one specific calibration parameter is checked and a deviation from a (theoretical) ideal or setpoint value is determined. This deviation forms the basis for the correction value, which is then taken into account during each machining. Thus, it is possible that various parameters (eg, the axis alignment) of the CNC machine do not correspond to an exact setpoint, but nevertheless a precise machining is made possible by the deviations of these parameters are taken into account.
    According to a preferred embodiment it can be provided that a calibration parameter is the alignment of at least two, preferably three, spatial axes of the CNC machine to one another. A "wrong" or distorted alignment of axes to each other is also called "axis distortion". In other words, there is an offset of the axes to each other. Ideally, the axes are arranged at an angle of 90 ° to each other. However, since this will only be the case in the rarest of cases and deviations from the nominal form to be produced thereby occur, this "axis distortion" is detected and counteracted by scanning and calculating correction factors or values.
    Additionally or alternatively, it may also be provided that a calibration parameter is a zero point of the clamping device. By applying the calibration mode, a correction value is determined. In this case this can be called "spindle offset".
    Additionally or alternatively, it may additionally be provided that a calibration parameter is at least one reference point of the test body relative to the clamping device. For example, four reference points, so-called "slot offsets" can be determined and compared, from which in turn a correction value is determined and determined.
    It is preferably provided that in the calibration mode the test specimen is clamped in the clamping device. Alternatively or additionally, it can also be provided that the test body is formed by the clamping device. In other words, the test body is formed integrally with a clamping device. Thus, the clamping device also has suitable test ranges for calibration. This variant can primarily be used to check the axis alignment and to calibrate accordingly.
    The above-mentioned object is also achieved by a CNC machine having the features of claim 6. Accordingly, it is provided that, in a calibration mode of the control unit, at least one calibration parameter of the CNC machine can be checked on the basis of a test body, preferably clamped in the clamping device, and at least one correction value can be determined, wherein the CNC machine is in machining mode as a function of at least a correction value can be controlled or regulated by the control or regulation unit. That is, via the control unit, the CNC machine is operable in both an edit mode and a calibration mode. In machining mode, the machine errors are then compensated on the basis of the at least one correction value.
    In general, this calibration mode can be used with any dental CNC machine, irrespective of how many axes the CNC machine has. It can be provided, for example, that the CNC machine has only two or three axes. Accordingly, a housing, a first drive device, with which the clamping device is movable relative to the housing about at least one axis, and a second drive device, with which the machining device is movable relative to the housing along at least one axis, can be provided. In this case, the clamping device may have a, preferably c-shaped, carrier, a support frame rotatably mounted on the support frame and an inner ring rotatably mounted on the support frame. This example refers to the so-called M5, which is produced by the company Zirkonzahn GMBH. Several CNC machining spindles can be mounted on this CNC machine.
    However, it is preferably provided that the CNC machine is designed as a 5-axis machine. In particular, it is thus provided that the first drive device has three drive motors, wherein the carrier is horizontally movable by a first drive motor along a first spatial axis, the holding frame is rotatable about a first axis of rotation by a second drive motor and the inner ring is rotated by a third drive motor second rotation axis is rotatable. In addition, it is provided that the second drive device has two drive motors, wherein the processing device is vertically movable by a fourth drive motor along a second spatial axis and is horizontally movable by a fifth drive motor along a third spatial axis. Of course, the exact distribution of these five axes can be different. For example, the machining device may be movable along all three spatial axes relative to the housing, while the clamping device is movable only about an axis of rotation relative to the housing. This example refers to the so-called M4, which is manufactured by Zirkonzahn GMBH.
    Moreover, it is also preferably provided that a machining device clamped in the machining device, preferably a milling cutter, drill or grinder, is rotatably drivable about a machining axis via a third drive device. Thus, this machining axis forms, so to speak, the total sixth axis. This processing device can be designed as a machining spindle. Preferably, it can also be provided that the CNC machine has a plurality of processing devices, preferably arranged parallel to one another.
    Further details and advantages of the present invention will be explained in more detail with reference to the description of the figures and the reference to the exemplary embodiments presented below. Show:
    1 is a perspective view of a CNC machine (M5),
    2 is a front view of another CNC machine (M4),
    3 shows schematically the inclination to the YZ plane,
    Fig. 4a is a plan view of the clamping device with four circular
    Workpiece holders,
    4b shows three different views of a test specimen with four
    recesses,
    Fig. 4c is a front view of a CNC machine with a in the
    5 to 24 different representations to illustrate possible calibration procedures.
    FIG. 1 shows a CNC machine 1 (corresponding to the machine called M5) for processing a dental workpiece 2 (not shown). This dental workpiece 2 is held in the clamping device 3, wherein this clamping device 3 is mounted relative to the housing 7 of the CNC machine 1 by a first drive device 8 about two axes of rotation A, B and along the spatial axis X in the horizontal direction. Specifically, a separate drive motor A1, A2 and A3 (eg electric motor) is provided for each of these axles. The clamping device 3 has a relative to the housing 7, preferably linear in the X direction, movable c-shaped support 10 and a support 10 rotatably mounted (first axis of rotation B) mounted Flalterahmen 11 (outer ring). Preferably, in this holding frame 11 is still not recognizable in detail inner ring (second axis of rotation A) movably mounted on which the dental workpiece 2 is held.
    In addition, the CNC machine 1 has a second drive device 9 for moving the processing device 4. In this case, the second drive device 9 comprises a two-axis drive (fourth drive motor A4 and fifth drive motor A5) for moving the processing device 4 along the spatial axes Y and Z.
    In addition, a third drive device 13 is provided which has a rotary drive (sixth drive motor A6) for rotationally driving the machining tool 14 (in particular in the form of a drill, milling cutter or grinder) about the machining axis C. Here, too, a separate electric motor is specifically provided for each of these axes (Y, Z and C).
    Furthermore, a central control or regulating unit 6 is provided, via which the CNC machine 1 can be operated at least in the two modes of processing mode BM and calibration mode KM. In both modes, corresponding control signals S are transmitted to the drive devices 8, 9 and 13 by the control or regulating unit 6. Especially in the calibration mode KM, a test button 15 is clamped in the processing device 4 instead of a processing tool 14. In addition, in the clamping device 3 instead of a dental workpiece 2, the test body 5 is clamped. In the calibration mode KM, a defined movement sequence of the processing device 4 and the clamping device 3 relative to the housing 7 is traversed, wherein a plurality of calibration points K are detected. The control or regulation unit 6 then calculates at least one correction value Q from these calibration points K. For example, this can mean in concrete terms that the first spatial axis X is at an angle of 89 ° (instead of ideally exactly 90 °) to the second spatial axis Y. If, after this calibration, the CNC machine 1 is again operated in the processing mode BM, this is taken into account at least one correction value Q. That is, the movement signals S are transmitted from the control unit 6 in response to the at least one correction value Q to the first drive device 8 of the chuck 3 and to the second drive device 9 of the processing device 4, respectively.
    It is preferably provided that the test button 15, with which the test body 5 is scanned, automatically by CNC machine 1, in particular by a processing device 4, fetched from a magazine or recorded. Thus, the test button 15 does not have to be laboriously assembled manually by a user. It can also be provided that a circuit is closed via a contact of the test button 15 with the test body 5.
    For the test body 5 and the test button 15 are at least partially formed metallic and are each via a signal line to the control or regulating unit 6 in electrical connection. As soon as the test body 5 is touched by the test button 15, the circuit is closed and the corresponding calibration parameter K is stored by the control unit 6. In principle, however, other variants of buttons can also be used. Furthermore, it can also be provided that the test body 5 - if it is designed as a separate part of the jig 3 - automatically removed from the CNC machine 1 from a magazine and in a tool holder 18 of the clamping device 3 can be received or clamped.
    FIG. 4 b shows an example of a specific test specimen 5 in a front view, in a side view and in a perspective view. The test specimen 5 has four, essentially square recesses 16. The side length of these recesses 16 is 20 mm. The thickness of the test piece 5 is 10 mm. A positioning region 17 (in the form of a depression in this case) is also formed on the test body 5, via which the test body 5 is positioned on the clamping device 3. The test piece 5 can also be shaped differently, as long as this shape is stored digitally.
    On the basis of the following figures, a preferred variant of a sequence of movements in the calibration mode KM is illustrated.
    FIG. 2 shows a front view of a CNC machine 1 (corresponding to the machine named M4). The clamping device 3 can be pivoted in this CNC machine 1 only about the rotation axis A. In addition, a machining tool 14 can still be rotated about a machining spindle of the machining device 4 about a machining axis C not shown here. In this CNC machine 1 according to FIG. 2, the components movable along the first spatial axis X and those along the third spatial axis Z are mounted on the component which is movable along the second spatial axis Y. Specifically, the spindle is mounted on the Z-axis, which in turn is mounted on the X-axis and this in turn on the Y-axis.
    The points given in the following description (calibration parameter K) can be recorded depending on the method step, whereupon a calculation takes place. Alternatively, all points can also be recorded in one pass, so that the calculation of all correction values Q takes place only at the end. This offers the possibility that only individual correction values Q can be determined.
    As a first step, as shown in FIG. 3, the angle at which the blank receptacle (clamping device 3) faces the YZ plane, which is spanned by the second spatial axis Y and the third spatial axis Z, is checked. This gives information about which angle the axis of rotation A is rotated when looking at the YZ plane. In the case shown, the axis of rotation A is pivoted by 10 °. This is achieved by moving the test button 15 along the second spatial axis Y and then calculating the angle over the Z difference of the scanned points. This step can then optionally be performed at the front and the back of the specimen 5 (pivoting through 180 °), and then continue to work with the average. The position or alignment (calibration parameter K) of the rotation axis A is then adjusted until an angle of approximately 0 ° is reached, which is then deposited (correction value Q).
    In a further step, it is then checked with reference to Fig. 4a, where in this case the horizontal center plane and the zero point N in the Z direction of the clamping device 3, which can pivot in this case about the rotation axis A of FIG. This is called "spindle offset". The term "spindle offset" here means the determination of the absolute zero point N of the complete clamping device 3 with all four workpiece holders 18 ("slots") (in this illustration not equipped with workpieces 2 or a test body 5). Thus, in this calibration, the clamping device 3 itself forms the test specimen. In other words, the workpiece holders 18 form specific test areas during the calibration. However, separate, not shown areas of the clamping device 3 may be provided as test areas.
    The calibration can additionally or alternatively via a test specimen 5, which is clamped in the clamping device 3 done. This is illustrated in Fig. 4c. The control unit 6 of the CNC machine knows, if no absolute measuring systems are used and the position of the clamping device 3 is stored, only approximately where the workpiece holders 18 are located. This is determined by approaching limit switches. Now, in this case, preferably all four, test specimens 5 are measured in the workpiece holders 18 in the direction of the spatial axes X, Y and Z. Thus, one then knows the absolute zero point N of the complete clamping device 3. In this step, however, one can simultaneously obtain all other necessary values for the calculation of the "slot offsets" (reference point R). This is then the distance in all axis directions to the "spindle offset" (zero point N). In the case of a single, centrally located workpiece holder 18, "spindle offset" and "slot offset" are the same. The envelope procedure is used to determine these offsets. As a result, it is possible to prevent the measurement results from being falsified, for example, by an obliquely clamped calibration plate (test specimen 5). In this case, an envelope of 180 ° is performed. By calculating the mean value of the recorded points, one then obtains the desired value (correction value Q), which no longer contains any systematic measurement deviations. Under certain circumstances, the handling procedure can also be omitted.
    For example, reference is made to FIG. 5. This Fig. 5 shows that the specimen 5 is clamped at an angle. If one wants to determine the center in the X direction here, the four recesses 16 are scanned in the X direction. However, if one measurement point is compared with the mirrored measurement point (after the envelope), one obtains the mean value which should lie exactly on the envelope axis U. In order to further improve the result, this is done at all four recesses 16.
    Referring again to Fig. 3, the following can be done: Since the calibration plate (specimen 5) has a thickness of 10 mm and the workpiece holder 18 is made so that the calibration plate during clamping theoretically exactly 5 mm upwards and downwards relative to Nullebene survives, it would be enough that z. B. scans only on the top to get the "spindle offset". However, since dirt can also falsify the position of the calibration plate in the workpiece or blank holder during clamping, the envelope process is used. Thus, an offset of the specimen 5 in the Z direction is compensated by comparing a point on the top and bottom. This can then be done on any number of points, in this case four. Based on this, then again a mean value is calculated. The point obtained does not necessarily have to be stored as zero point.
    As a further step, with reference to FIG. 6, it is then checked how the horizontal plane of the workpiece holder is pivoted. If this is considered in a plan view of the XZ plane, one then obtains the angle to the first spatial axis X. In this one can also say that the angle between the axis of rotation A and the first axis of space X is measured. The axis of rotation A is accordingly on this horizontal blank plane and this can be pivoted about the axis of rotation A. For this purpose, the procedure is then carried out in the first spatial axis X and the angular offset is calculated via the Z difference of the sampled points and then taken into account via a correction value Q. For example, this can in turn be performed only at the top, but optionally can also be pivoted by 180 °, whereupon the average value of the front and back is formed. These measurements can only be performed on a workpiece holder 18. Optionally, however, each of these measurements can be carried out for each workpiece holder 18 ("slot") and eigen values stored. One can also use these total values to form again comprehensive averages.
    In a further step, illustrated in FIG. 7, the inner sides IS of the test body 5 are scanned on the front side and the back side in order to compensate for the error, should the test body 5 be clamped obliquely, as already shown in FIG. For more accurate results, this can be done on the right and / or left inside IS. Here is moved along the second spatial axis Y and then the distance along the second
    Space axis X scanned. The X-difference can be used to calculate the angle. The collected values are then merged back into an average. Theoretically, as with the other measuring steps, it is generally not necessary to measure four angles here. One could only use the two points IS4 and IS3 on the insides IS from the front "front" to get an angle. By wrapping around 180 ° about the axis of rotation A on the back "back" and measuring the points IS4 and IS3 on the back, however, you can form the average of the two angles and is therefore more accurate. As a further expansion stage, the measurement is carried out as already mentioned on the left and right Kalibrierplatteninnenfläche. This "game" could then be repeated in further recesses 16 and associated inner sides IS. The obtained angle can be concluded from the angle between the second spatial axis Y and the axis of rotation A. For this purpose, some views are shown in FIG. 8 on the XY plane. By using the transfer method, one obtains a center line MK of the calibration plate, which is always 90 ° to the rotation axis A. If you move to 2 defined positions in the Y direction and then measure the X distance, the angle between Y and A can be determined based on the X difference. For this purpose, the determined distances are transferred to a rectangular coordinate system (see detail above right). The trajectories in X and Y are oriented differently than in the left-hand representation. In this example, it is assumed that X and Y are at 90 ° to each other. In this detail, at the top right, the upper horizontal line represents the travel path in Y. The two vertical lines represent the travel path in X. The lower horizontal or slightly oblique line represents the angular deviation. The same explanations apply mutatis mutandis to the above right Details shown in FIGS. 9 to 11 and 13 to 16.
    However, it may also be that X and Y are not at 90 ° to each other, as illustrated in FIG. 9. However, if the A-axis is at 90 ° to the Y-axis, this is noticeable by the fact that the travel in X is the same at both positions.
    In these two cases shown in FIG. 8 and 9 are each two axes at a 90 ° angle to each other. Thus, the Y-axis to the A-axis can be calculated correctly. These representations are theoretically to explain the principle. The center line MK is obtained purely arithmetically via the turnover method and also the distances in the X direction mentioned in the two examples are determined by calculation. On the other hand, one can also assume that the calibration plate is clamped without angular offset in the workpiece holder and thus make the handling unnecessary.
    Now, however, it can also happen that all axes are at an angle to each other. In such a (third) possibility, it may be that the A-axis is neither parallel to the X-axis nor perpendicular to the Y-axis, as shown in Fig. 10. Again, you can calculate the angle between the Y-axis and the A-axis again using the difference in the X-direction. However, one has to make an assumption in this construct. We know the traverse path in Y and the trajectories in X. However, because there is no 90 ° angle in the system in this case, it is not possible to determine the angle of the Y axis to the A axis 100% accurately. It is therefore not possible to get to the correct angle using the values obtained, since there is too much of an unknown. As you can see, the configuration shown has an error of about 5% based on the deviation from 10 ° to 10.47 °.
    A similar problem is also illustrated in FIG. For the further steps, it can now be assumed that the above-mentioned error is accepted and continues to be counted with the error-prone value, above all because the cases shown are already extreme cases, which will rarely occur in reality. Accordingly, with reference to FIG. 12, the position of the X axis to the A axis is still missing. To calculate this, consider the points ISh and IS-io in Fig. 12. At these points, the inner surfaces of the specimen 5 are scanned again. As in the example according to FIG. 7, it is also possible here to scan only the points IS- | 4 and IS-m from the front side "front". A defined path is traversed in the X direction and the distance in the Y direction is considered. The angle can then be calculated using the Y difference. In order to improve this measurement result, the transfer method is used again. In addition, the measuring points on the opposite side can also be taken again. You can then use these measuring points to calculate the turnover axis U as well.
    In itself, the complete sequence according to FIGS. 13 to 16, as described in the example according to FIGS. 7 to 9, whereby also similar miscalculations can occur. Since these are very small, however, a significant improvement in the machining or milling results is achieved.
    To compensate for this error as well, the following procedure can be used. Specifically, the orientation of the Y-axis and X-axis is calculated.
    With reference to FIG. 17, the inner surfaces or inner sides IS of at least one cutout (recess 16) in the test body 5 are scanned. In this case, however, only traversing in the X direction in order to obtain no Y error. The X values for the point ISi and the point IS2 are obtained. In this case, it does not matter whether the test specimen 5 is clamped obliquely, because this malposition can now be compensated. The dimensions of the square recess 16 in this case are known in this case with the side length of 20 mm. By way of the X distance of the points ISi and IS2 and of the recess dimensions, it can be calculated by how much the recess 16 is rotated about the X-axis. In the case shown in Fig. 18, this rotation is 13 °. The recess 16 with an inner dimension of 20 mm must be made very precisely.
    In the next step, with reference to FIGS. 19 and 20, the recess 16 is then virtually rotated by the determined misalignment. Now, the recess 16 is scanned again, but this time only one side is scanned and additionally delivered in the Y direction. However, the values obtained in X must now be converted to the rotated recess 16. It is then possible to calculate the difference in length and the travel distance delivered in the Y direction by how much the X axis and the Y axis deviate from the 90 ° angle. It is assumed that the recess 16 has an angle of 90 °. So it is then possible, in this case on the basis of the X, Y and A-axis, to determine the exact position of each other. If this additional step of measuring and turning a recess is not made, it is still possible to perform a calibration, but the correction values Q may contain small deviations. With the correction values Q, it is then possible to compensate for the axial offset when milling a dental workpiece 2. This is then also possible if necessary for the Z-axis and when using a B-axis instead of an A-axis. It can also be provided an A, a B and a C axis. Accordingly, then the described steps are also applied in adapted form for these cases. With this additional step, it is possible to carry out the method steps described above without errors due to the unknown position of the axes to each other, since now an additional angle in the system is known.
    It may also be as shown in Fig. 21 to calculate the orientation of the X-axis to the Y-axis. In this case, however, one must again accept small deviations in the evaluation. In the next case shown, the deviation can still be avoided if the recess 16 is aligned perfectly parallel to the X-axis. By means of the different travel in the Y-direction, which results when the vertical inner surface of the recess 16 is scanned, the alignment of the axes with respect to one another can be calculated.
    If, however, the recess 16 also lies obliquely in relation to the X-axis, a small error results again, as can be seen in FIG. 22. Here, an angle of 105 ° between the spatial axes X and Y is effectively given, wherein the recess 16 is rotated by 5 ° to the X-axis.
    If these points are now transferred into a virtual rectangular coordinate system, the situation according to FIG. 23 is obtained. The offset of the axes is determined here via the recorded points and the theoretical line T, which is at a 90 ° angle to the horizontally oriented line , You can see that this results in small deviations from the 105 ° and 5 °.
    However, these move in the hundredths and thus fall hardly significant.
    The procedures given are but a few ways to perform such a calibration and in these cases have always been represented by the X, Y and A axes. It goes without saying that these can also be adapted to combinations with other axes of rotation and translation.
    In addition, the "spindle offset" is then also calculated, reference being made to FIG. 4a. For this purpose, the center of the workpiece holder 18 is measured in an X and a Y direction. This can be done either via the geometry of the workpiece holder 18 itself or via the measurement of the calibration plate in the workpiece holders 18 ("slots"). For this purpose, the inner surfaces of the recesses 16 are scanned again, the clamping device 3 is pivoted through 180 ° and then combined again the opposite points. Thus, by comparing the measurements of the individual recesses 16 on the "spindle offset" and in reverse then on the distance in the X direction and in the Y direction from the zero point N of the clamping device 3 are closed. These values can also be obtained if the test body 5 (calibration plate) is measured only in a recess 16, since the distance to the other recesses 16 is generally defined. The clamped specimens 5 are manufactured with the highest precision and dimensional accuracy. Thus, all recesses 16 to each other and even provided with very tight tolerances.
    A compensation graphically displayed as in Fig. 24 look. In the ideal coordinate system, a point with the coordinates 50; 40 are approached. However, it was determined that the axes are not 90 °, but at an angle of 80 ° to each other. Thus it can be calculated that in the X-direction now 43.8 and in the Y-direction 35.54 must be moved. Reference may also be made to the following formulas.
    In short, in other words, the present invention is based on the fact that a test button is clamped in a machining spindle, which then leaves a test specimen. A software recognizes certain points or stores measured points, from which the perpendicularity and parallelism of certain calibration parameters (eg the axes) is determined. Deviations from a theoretically ideal orientation are thereby recognized and taken into account later in the machining of the dental workpiece.
    LIST OF REFERENCES: 1 CNC machine 2 dental workpiece 3 clamping device 4 processing device 5 test piece (calibration plate) 6 control or regulating unit 7 housing 8 first drive device 9 second drive device 10 carrier 11 holding frame 12 inner ring 13 third drive device 14 processing tool 15 test button 16 recess in the test body 5 17 Positioning area 18 Workpiece fixture in fixture 3 BM Machining mode KM Calibration mode K Calibration parameter Q Correction value A1-A6 Drive motors X first spatial axis Y second spatial axis Z third spatial axis B first rotational axis A second rotational axis C machining axis S motion signal N zero point R reference point U envelope axis IS inner sides MK center line T theoretical line
    Innsbruck, 9 June 2016
    权利要求:
    Claims (12)
    [1]
    claims
    A method of operating a CNC machine (1) for machining a dental workpiece (2), wherein - when the CNC machine (1) is operated in a machining mode (BM) - the dental clamped in a jig (3) Workpiece (2) by a processing device (4) of the CNC machine (1) is processed, characterized in that-when the CNC machine (1) in a calibration mode (KM) is operated - based on a test body (5) at least one Calibration parameter (K) of the CNC machine (1) checked and at least one correction value (Q) is set, wherein the CNC machine (1) in the processing mode (BM) in dependence of the at least one correction value (Q) is operated.
    [2]
    2. The method according to claim 1, characterized in that a calibration parameter (K) is the alignment of at least two spatial axes (X, Y, Z) of the CNC machine to each other.
    [3]
    3. The method according to claim 1 or 2, characterized in that a calibration parameter (K) is a zero point (N) of the clamping device (3).
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that a calibration parameter (K) is at least one reference point (R) of the test body (5) relative to the clamping device (3).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that during operation of the CNC machine (1) in the calibration mode (KM) of the test body (5) in the clamping device (3) is clamped.
    [6]
    6. CNC machine (1) for processing a dental workpiece (2), comprising - a clamping device (3) for clamping the dental workpiece (2), - a processing device (4) for processing the dental workpiece (2) and - a Control unit (6) for controlling or regulating movements of the CNC machine (1), wherein in a processing mode (BM) of the control unit (6), the dental workpiece (2) is machinable, characterized in that in a calibration mode (KM) of the control unit (6) based on a test body (5) at least one calibration parameter (K) of the CNC machine (1) is verifiable and at least one correction value (Q) can be fixed, wherein the CNC machine (1) in the processing mode (BM) as a function of the at least one correction value (Q) of the control or regulating unit (6) is controlled or regulated.
    [7]
    7. CNC machine according to claim 6, characterized by - a housing (7), - a first drive device (8), with which the clamping device (3) relative to the housing (7) around or along at least one axis (X, A, B) is movable, and - a second drive device (9), with which the processing device (4) relative to the housing (7) about or along at least one axis (Y, Z) is movable.
    [8]
    8. CNC machine according to claim 7, characterized in that the first drive device (8) has three drive motors (A1, A2, A3) and the clamping device (3) has a preferably C-shaped carrier (10), one on the carrier ( 10) rotatably mounted holding frame (11) and one on the holding frame (11) rotatably mounted inner ring (12), wherein the carrier (10) by a first drive motor (A1) along a first spatial axis (X) is horizontally movable, the holding frame ( 11) is rotatable about a first rotation axis (B) by a second drive motor (A2) and the inner ring (12) is rotatable about a second rotation axis (A) by a third drive motor (A3).
    [9]
    9. CNC machine according to claim 7 or 8, characterized in that the second drive device (9) has two drive motors (A4, A5), wherein the processing device (4) from a fourth drive motor (A4) along a second spatial axis (Y) is vertically movable and by a fifth drive motor (A5) along a third spatial axis (Z) is horizontally movable.
    [10]
    10. CNC machine according to one of claims 7 to 9, characterized in that via a third drive device (13) in the processing device (4) clamped machining tool (14), preferably a milling cutter, drill or grinder to a machining axis (C ) is rotatably driven.
    [11]
    11. CNC machine according to at least one of the preceding claims, characterized in that a calibration parameter (K) the alignment of at least two axes, preferably at least two spatial axes (X, Y, Z) and / or axis of rotation (A, B, C) is a zero point (N) of the clamping device (3) or at least a reference point (R) of the test body (5) relative to the clamping device (3).
    [12]
    12. CNC machine according to at least one of the preceding claims, characterized in that the test body (5) in the calibration mode (KM) in the clamping device (3) is clamped.
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    同族专利:
    公开号 | 公开日
    EP3255515A2|2017-12-13|
    AT518176B1|2017-08-15|
    EP3255515B1|2020-07-01|
    EP3255515A3|2018-01-24|
    ES2820649T3|2021-04-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2000073028A1|1999-05-28|2000-12-07|Bernd Scheibner|Method for measuring a handling device|
    DE602005003012T2|2005-05-06|2008-08-07|Satisloh Gmbh|Method for the automatic calibration of the tools in a lathe used for the production of eyeglass lenses in particular|
    DE102008006927A1|2008-01-24|2009-07-30|Afm Technology Gmbh|Correction device for correcting geometric error of position sensor unit of positioning system of e.g. measuring system, has unit, where device emits modified measuring signal with information and correction value is determined for unit|
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    AU7688201A|2000-10-20|2002-05-06|Lightwave Microsystems Inc|Apparatus and method to dice integrated circuits from a wafer using a pressurized jet|
    DE102011011946A1|2011-02-22|2012-09-13|Liebherr-Verzahntechnik Gmbh|Method for measuring and testing a workpiece and gear cutting machine|
    DE102012221782A1|2012-11-28|2014-05-28|Lufthansa Technik Ag|Method and device for repairing an aircraft and / or gas turbine component|CH714924A1|2018-04-23|2019-10-31|Denta Vision Gmbh|Calibration of various devices in the digital workflow of a production process.|
    EP3674033A1|2018-12-27|2020-07-01|Schwäbische Werkzeugmaschinen GmbH|Method for determining topography of a tool machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50529/2016A|AT518176B1|2016-06-09|2016-06-09|Method for operating a CNC machine|ATA50529/2016A| AT518176B1|2016-06-09|2016-06-09|Method for operating a CNC machine|
    EP17170819.1A| EP3255515B1|2016-06-09|2017-05-12|Method for operating a cnc machine|
    ES17170819T| ES2820649T3|2016-06-09|2017-05-12|Method for operating a CNC machine|
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