JP6456434B2 - Vibration source estimation device - Google Patents

Description

  The present invention relates to a vibration source estimation device configured to monitor vibrations generated during machining using a machine tool and estimate the vibration source, and to notify the information related to the estimated vibration source to the outside.

  In the field of machining using machine tools, efficient machining of workpieces and reduction of machining costs are being sought as permanent issues. On the other hand, with regard to machining accuracy required for machining, high accuracy is increasingly required day by day, and when machining a workpiece, elements of machining efficiency, machining cost, and machining accuracy are required. It is necessary to set processing conditions that satisfy the standards.

  Therefore, focusing on regenerative chatter, which is one of the factors affecting the machining accuracy, a diagram showing the correlation between the rotation speed of the spindle that rotates the tool or workpiece and the limit cutting depth of the tool that causes regenerative chatter. There has been proposed an apparatus for creating and displaying a stability limit diagram indicating a boundary between a stable region where no regenerative chatter occurs and an unstable region where regenerative chatter occurs (see, for example, Patent Document 1).

This stability limit diagram shows that when the spindle rotational speed is a value obtained by dividing the natural frequency of the tool by the number of blades of the tool, the limit cutting depth of the tool shows a peak, that is, the stable region has a peak. It has a so-called stable pocket (primary stable pocket), and further has a high-order stable pocket at each spindle rotational speed obtained by dividing the spindle rotational speed corresponding to the primary stable pocket by an integer of 2 or more. The spindle speed of the k-th order stable pocket is expressed as follows.
(Spindle rotational speed of k-th order stable pocket) = (60 × natural frequency of tool) / (number of blades of tool × k)
However, k is an integer greater than or equal to 1 representing the order.

  According to this stability limit diagram, the operator can instantly visually recognize the relationship between the spindle rotation speed at which regenerative chatter does not occur and the cutting depth of the tool, and efficient machining that does not cause regenerative chatter. Conditions can be set easily. Thus, according to the above apparatus, the operator can set efficient machining conditions within a range in which regenerative chatter does not occur by using the stability limit diagram displayed on the apparatus as a reference.

Also, conventionally, when regenerative chatter occurs, a method has been proposed in which the spindle rotational speed is changed to the expected stable rotational speed calculated according to the following formula based on the above-mentioned stable pocket theory in order to eliminate regenerative chatter. (See Patent Document 2).
Expected stable rotation speed = (60 × chat frequency) / (number of tool blades × n)
However, n is an arbitrary integer.

  According to Patent Document 2, it is expected that the chatter will be suppressed by changing the spindle rotational speed to the predicted stable rotational speed.

Japanese Patent No. 5622626 Japanese Patent No. 5384996

  Conventionally, it has been considered that the main vibration source of vibration generated during machining is either a tool or a workpiece. However, in addition to a tool and a workpiece which are direct machining sites, a tool for holding a tool. It has been found that components such as a holder, a spindle that rotates a tool or a workpiece, and a jig that holds the workpiece indirectly connected to the processing site can also be a vibration source.

  Therefore, when chatter vibration occurs, the operator in charge of the machine tool and the manager managing the machining process can quickly recognize which component member is vibrating and suppress the occurrence of chatter vibration. Therefore, it is necessary to take appropriate measures according to the vibration source.

  In addition, if chatter vibrations occur, or even if vibrations do not reach chatter vibrations, if the corresponding vibration sources can be recognized, the operator or administrator can improve the machining. It is preferable because it can be objectively recognized and the processing conditions can be objectively evaluated.

  The present invention has been made in view of the above circumstances, and monitors vibration generated during machining using a machine tool to estimate the vibration source, and informs the outside of information related to the estimated vibration source. An object of the present invention is to provide a vibration source estimation apparatus capable of performing

The present invention for solving the above problems is an apparatus for estimating a vibration source of vibration generated during machining using a machine tool,
A natural frequency storage unit that stores natural frequencies of at least a tool, a tool holder that holds the tool, a workpiece, and a component that includes the main shaft of the machine tool, which generate vibrations by processing;
A vibration detection unit that detects vibration acceleration of the structural member generated by the processing and outputs a signal related to the detected vibration acceleration;
A frequency analysis unit for analyzing a frequency of a vibration signal output from the vibration detection unit;
Acceleration-vibration frequency data indicating the relationship between the magnitude (amplitude) of vibration acceleration analyzed by the frequency analysis unit and the vibration frequency, or the magnitude (amplitude) of vibration energy calculated from the acceleration-vibration frequency data At least of the energy-vibration frequency data indicating the relationship with the vibration frequency or the displacement-vibration frequency data indicating the relationship between the vibration displacement magnitude (amplitude) calculated from the acceleration-vibration frequency data and the vibration frequency. Based on any data, referring to the data stored in the natural frequency storage unit, a vibration source estimation unit that estimates a component considered as a vibration source,
The present invention relates to a vibration source estimation device including a notification device that notifies the outside of information related to a component estimated as a vibration source by the vibration source estimation unit.

  According to the vibration source estimation device, at least one or more tools used in a machine tool, a tool holder for holding each tool, one or more workpieces to be machined, and a characteristic of each component such as a spindle of the machine tool Data relating to the frequency is stored in advance in the natural frequency storage unit. Each natural frequency is determined by, for example, allowing each component member to freely vibrate by hammering or a vibration device, and measuring the free vibration using an accelerometer and analyzing the frequency of the measured vibration signal. Obtained by. Then, the data related to the natural frequency measured in this way is stored in the natural frequency storage unit in association with the corresponding component.

In the vibration source estimation apparatus, when machining is performed by the machine tool, the vibration acceleration of the constituent member generated during the machining is detected by the vibration detection unit, and the detected vibration signal is frequencyd at a predetermined sampling interval. Frequency analysis is performed by the analysis unit.

  The data obtained by the frequency analysis is acceleration-vibration frequency data (acceleration versus vibration frequency data) indicating the relationship between the magnitude of vibration acceleration (hereinafter simply referred to as “acceleration”) and the vibration frequency. A vibration frequency that is large, that is, has a large amplitude with respect to acceleration, can be recognized.

When the vibration frequency for the acceleration A [m / s ² ] is f [Hz], the specific energy E [m ² / s ² ], which is vibration energy per mass, is expressed by the following Equation 1.
(Formula 1)
E = (A / (2πf)) ² × (1/2)
Therefore, from this acceleration-vibration frequency data, energy-vibration frequency data (energy vs. vibration frequency data) indicating the relationship between the magnitude of vibration energy (hereinafter simply referred to as “energy”) and the vibration frequency is obtained from the acceleration-vibration frequency data. Can be calculated. From this data, it is possible to recognize a vibration frequency having a large energy, that is, a vibration frequency having a large amplitude for the energy.

Further, the displacement D [m] with respect to the acceleration A [m / s ² ] is expressed by the following mathematical formula 2.
(Formula 2)
D = A / (2πf) ²
Therefore, from this acceleration-vibration frequency data, displacement-vibration frequency data (displacement versus vibration frequency data) indicating the relationship between the magnitude of vibration displacement (hereinafter simply referred to as “displacement”) and the vibration frequency is obtained from the acceleration-vibration frequency data. Can be calculated. From this data, it is possible to recognize a vibration frequency having a large displacement, that is, a large amplitude for the displacement.

  Thus, in the present invention, at least one of the acceleration-vibration frequency data, energy-vibration frequency data calculated from the acceleration-vibration frequency data, or displacement-vibration frequency data in the vibration source estimation unit. Based on any of the data, the data in the natural frequency storage unit is referred to, and the constituent member having the natural frequency closest to the vibration frequency indicating the magnitude exceeding the predetermined threshold in each data is estimated as the vibration source. The

  As described above, the main vibration source of vibration generated during machining is indirect such as a tool holder that holds the tool and a spindle that rotates the tool or workpiece, in addition to the tool and workpiece that are direct machining sites. Constituent members connected to the processing site can be considered. And when the frequency of the vibration generated by the machining is close to the natural frequency of any one of these tools, workpieces, tool holders, and spindles, it is considered that the constituent member greatly vibrates exceeding a predetermined threshold. Therefore, if the magnitude of vibration (at least one of acceleration, energy, or displacement) generated during machining exceeds a predetermined threshold, the natural frequency closest to the vibration frequency It is considered that the constituent member having a vibration source is a vibration source. In the vibration source estimation apparatus according to the present invention, the vibration source is estimated by the vibration source estimation unit under such a concept.

  And the information which concerns on the structural member estimated as a vibration source in this way is alert | reported outside by an alerting | reporting apparatus. As notification modes by the notification device, notification by voice, notification by appropriately displaying images and characters on a display, and the like are conceivable.

  If the influence on the cutting edge of the tool is important, the estimation of the vibration source based on the acceleration is preferable. If the surface accuracy of the machining surface is important, the estimation of the vibration source based on the displacement is preferable. If both the influence on the tool edge and the surface accuracy of the machined surface are taken into consideration, it is preferable to estimate the vibration source based on energy. Further, a vibration source estimated from acceleration, energy, and displacement may be comprehensively evaluated.

  Thus, according to the vibration source estimation device, the vibration source generated during machining is estimated, and the estimated vibration source is notified to the outside. Can be easily recognized. In particular, in the case of chatter vibration whose magnitude exceeds a predetermined threshold value, a measure corresponding to the estimated component can be taken as a measure for suppressing the chatter vibration.

  For example, when the vibration source is a tool, the rotation speed of the tool is changed to the expected stable rotation speed disclosed in Patent Document 2 described above, or the cutting conditions such as the cutting depth are changed, or the tool is protruded. Chatter vibration can be suppressed by shortening the amount, and when the workpiece is a vibration source, chatter vibration can be suppressed by improving the workpiece holding mode to a mode that provides a vibration damping effect. It is. Further, when the tool holder is a vibration source, the tool holder is changed to a tool holder having an excellent vibration damping effect, or the rotation speed of the tool is changed to the predicted stable rotation speed or the cutting depth is changed in the same manner as the tool. Chatter vibration can be suppressed by changing the cutting conditions such as the length or shortening the protruding amount of the tool. Even when the main shaft is a vibration source, chatter vibration is reduced by changing the rotation speed of the tool to the predicted stable rotation speed or by changing the cutting conditions such as the cutting depth, as in the case of the tool. It can be suppressed.

  In addition, the operator or the like recognizes the vibration source that generates the vibration, so that the improvement point in the processing, for example, the strength improvement of the jig holding the workpiece, the change of the tool holder, etc. It is possible to recognize the components, and to objectively evaluate the machining conditions. Based on the evaluation, machining conditions (spindle rotation speed, feed speed (feed amount per blade), cutting depth Width, depth of cut, etc.) can be improved.

In the present invention, the notification device is based on a display that displays an image, a model data storage unit that stores two-dimensional or three-dimensional model data of the constituent members, and model data stored in the model data storage unit. And a display processing unit configured to display a two-dimensional or three-dimensional model related to the constituent member on the display,
The display processing unit may be further configured to display the model of the constituent member estimated by the vibration source estimation unit on the display so as to be distinguishable from the model of the other constituent member.

  According to the notification device configured as described above, an operator or the like can visually recognize the vibration source from the model image displayed on the display, and thus can more easily recognize the vibration source.

The vibration source estimation apparatus according to the present invention further includes a vibration source information storage unit that stores information related to the constituent members estimated by the vibration source estimation unit,
The vibration source estimation unit is configured to estimate the vibration source every predetermined time, and to store information on the estimated component member together with time information in the vibration source information storage unit,
Based on the information stored in the vibration source information storage unit, the display processing unit can identify the model of the component member estimated by the vibration source estimation unit from the model of the other component member according to the time information. It may be configured to display on the display.

  According to the vibration source estimation device having this configuration, the vibration source estimation unit estimates the vibration source at each predetermined time, and information on the estimated component is stored in the vibration source information storage unit together with the time information. Stored. The display processing unit can identify the model of the component member estimated by the vibration source estimation unit based on the information stored in the vibration source information storage unit from the models of other component members. Show on the display.

  Thus, according to the vibration source estimation apparatus, the vibration source model that changes over time is displayed on the display so that it can be distinguished from the models of other components, in other words, the change of the vibration source over time. The replay display allows operators to visually recognize the vibration source that changes as the machining time elapses, including temporal factors such as the vibration time, and re-examine the vibration phenomenon. can do.

  Further, in the present invention, the vibration source estimation unit is configured to estimate a plurality of constituent members ranked with high possibility as a vibration source, and the notification device is estimated by the vibration source estimation unit. The plurality of constituent members may be notified together with information related to the ranking. For example, when a plurality of vibration frequencies whose vibration magnitude exceeds a predetermined threshold are confirmed, there is a possibility that a constituent member having a natural frequency close to the vibration frequency in the descending order of vibration magnitude as a vibration source. Make it a high ranking. In this way, since a plurality of constituent members estimated as vibration sources are notified together with information related to the ranking of the possibility, the operator or the like knows which constituent members are related to vibration and It is possible to easily recognize the possibility of the vibration source, and to easily grasp a complicated vibration state.

  The vibration source estimation apparatus according to the present invention integrates at least one of the acceleration-vibration frequency data, energy-vibration frequency data, or displacement-vibration frequency data, and Based on the data stored in the natural frequency storage unit, it further includes a load state evaluation unit that evaluates the load state applied to each component member, and the notification device is evaluated by the load state evaluation unit You may be comprised so that the information which concerns on the load state of each structural member may be displayed.

  Further, the vibration source estimation apparatus according to the present invention calculates the frequency at which each component member is estimated to be a vibration source by the vibration source estimation unit, and acts on each component member based on the calculated frequency. A load state evaluation unit that evaluates each of the load states may be further provided, and the notification device may be configured to display information on the load state of each component evaluated by the load state evaluation unit.

  According to the vibration source estimation device of these aspects, the load state related to the vibration of each component member is evaluated and the evaluated load state is displayed. The load state can be objectively recognized, and, for example, when it is determined that the service life has been exceeded, measures such as replacing the corresponding component with a new one Can be taken.

  The vibration source estimation apparatus according to the present invention further includes a chatter detection unit that detects whether or not chatter has occurred in the tool from the acceleration-vibration frequency data analyzed by the frequency analysis unit, and the notification device includes: When chatter is detected by the chatter detection unit, it may be configured to notify that effect. In this way, an operator or the like can easily recognize that chatter vibration has occurred during machining.

  Further, the chatter detecting unit further determines whether the detected chatter phenomenon is a regenerative chatter phenomenon or a forced chatter phenomenon based on the acceleration-vibration frequency data analyzed by the frequency analyzing unit. And when the chatter is detected by the chatter detecting unit, the alerting device informs that at least one of lowering the notch or lowering the feed rate is taken, and detecting the chatter. When the chatter is detected by the unit, it may be configured to notify that the spindle rotational speed is increased or decreased. In this way, the operator or the like can take an appropriate response according to the generated chatter vibration.

  The vibration source estimation device according to the present invention further includes a tool monitoring unit that monitors the operating state of the tool, and the notification device is configured such that the vibration source estimation unit estimates that the tool is a vibration source. In addition, when it is determined that the tool is in the initial wear period from the operating state of the tool monitored by the tool monitoring unit, a notification to that effect may be made. In this way, even if the vibration of the tool is chatter vibration, the operator or the like can easily recognize that the vibration is vibration due to the initial wear period of the tool. After removal, it can be known in advance that chatter vibration does not occur even under the same processing conditions.

  Thus, according to the vibration source estimating apparatus according to the present invention, the vibration source of the vibration generated during machining is estimated, and the estimated vibration source is notified to the outside. The vibration source can be easily recognized. In particular, in the case of chatter vibration whose magnitude exceeds a predetermined threshold value, it is possible to take appropriate measures according to the estimated component member in order to suppress the chatter vibration.

  Further, the operator or the like can objectively recognize improvement points in the processing (for example, strength improvement of the work holding jig, change of the tool holder, etc.) by recognizing the vibration source that generates the vibration. It is possible to objectively evaluate the machining conditions, and improve the machining conditions (spindle rotation speed, feed rate (feed amount per blade), cutting width, cutting depth, etc.) based on the evaluation. Can be achieved.

It is the block diagram which showed schematic structure, such as a vibration source estimation apparatus and a numerical control apparatus which concern on one Embodiment of this invention. It is the perspective view which showed the machine tool in this embodiment. It is explanatory drawing which showed the data table stored in the natural frequency memory | storage part of this embodiment. It is explanatory drawing which showed the data table stored in the vibration source information storage part of this embodiment. It is explanatory drawing which shows an example of the acceleration-vibration frequency data which is an analysis result in the frequency analysis part of this embodiment. It is explanatory drawing which shows an example of the acceleration-vibration frequency data which is an analysis result in the frequency analysis part of this embodiment. It is explanatory drawing which showed an example of the screen displayed on a display apparatus by the display process part of this embodiment. It is explanatory drawing which showed an example of the screen displayed on a display apparatus by the display process part of this embodiment. It is explanatory drawing which showed an example of the screen displayed on a display apparatus by the display process part of this embodiment. It is explanatory drawing which showed an example of the screen displayed on a display apparatus by the display process part of this embodiment. It is explanatory drawing for demonstrating the process in the load condition evaluation part of this embodiment. In other embodiment of this invention, it is explanatory drawing which showed the data table stored in the vibration source information storage part. In other embodiment of this invention, it is explanatory drawing which shows an example of the acceleration-vibration frequency data which is the analysis result in the frequency analysis part. In other embodiment of this invention, it is explanatory drawing which shows an example of the energy-vibration frequency data calculated in the vibration source estimation part. In other embodiment of this invention, it is explanatory drawing which shows an example of the displacement-vibration frequency data calculated in the vibration source estimation part.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vibration source estimation device, a numerical control device, and the like according to an embodiment of the present invention. Hereinafter, each device of the machine tool 30, the numerical control device 20, and the vibration source estimation device 1 according to the present embodiment will be described.

A. Machine Tool First, an outline of the machine tool 30 in the present embodiment will be described. As shown in FIG. 2, the machine tool 30 of this example includes a bed 31, a column 32 erected on the bed 31, and an arrow Z-axis direction on the front surface (surface on the processing region side) of the column 32. A spindle head 33 movably provided on the head, a spindle 34 held by the spindle head 33 so as to be rotatable about the axis, and a bed 31 below the spindle head 33 so as to be movable in the Y-axis direction. A saddle 35, a table 36 disposed on the saddle 35 so as to be movable in the X-axis direction, an X-axis feed mechanism 39 for moving the table 36 in the X-axis direction, and the saddle 35 in the Y-axis direction. A Y-axis feed mechanism 38 that moves, a Z-axis feed mechanism 37 that moves the spindle head 33 in the Z-axis direction, and a spindle motor (not shown) that rotates the spindle 34 are provided.

  The X-axis feed mechanism 39, the Y-axis feed mechanism 38, the Z-axis feed mechanism 37, and the main shaft motor (not shown) are driven to rotate the main shaft 34 about its axis, and the main shaft 34 and the table 36 are moved. By relatively moving in the three-dimensional space, the workpiece W fixed on the table 36 via the workpiece holding jig WJ is processed by the tool TL mounted on the spindle 34. The tool TL is attached to the main shaft 34 while being held by the tool holder TH, and FIG. 2 shows an end mill as an example of the tool TL.

B. Numerical Control Device As shown in FIG. 1, the numerical control device 20 includes an NC program execution unit 21, an NC program storage unit 24, a spindle control unit 22, a feed control unit 23, and the like as main components.

  The numerical controller 20 is composed of a computer including a CPU, RAM, ROM, and the like. The NC program storage unit 24 is composed of an appropriate storage medium such as a RAM, and the functions of the NC program execution unit 21, the spindle control unit 22, and the feed control unit 23 are realized by a computer program.

  The spindle control unit 22 is a control unit that controls the operation of a spindle motor (not shown). For example, the spindle control unit 22 receives a control signal (command signal) related to the spindle rotational speed from the NC program execution unit 21, and The spindle motor (not shown) is controlled so that the rotation speed of the spindle 34 becomes the commanded rotation speed.

  The feed control unit 23 is a control unit that controls the operation of the X-axis feed mechanism 39, the Y-axis feed mechanism 38, and the Z-axis feed mechanism 37. For example, each feed axis from the NC program execution unit 21 is controlled. A control signal related to the movement position and movement speed for (X axis, Y axis and Z axis) is received, and the corresponding X axis feed mechanism 39, Y axis feed mechanism 38 and Z axis feed mechanism 37 are driven and commanded. The main shaft 34 and the table 36 are relatively moved in the three-dimensional space so that the commanded positional relationship is obtained at the moving speed.

  The NC program execution unit 21 reads the NC program stored in the NC program storage unit 24, sequentially analyzes the NC program, generates a control signal according to the command, and generates the generated control signal as the spindle control unit. 22 and processing to transmit to the feed control unit 23 are performed.

  Thus, according to the numerical controller 20, the NC program stored in the NC program storage unit 24 is executed by the NC program execution unit 21, and the spindle motor (see FIG. (Not shown) is driven by the spindle control unit 22 so that the spindle 34 rotates about its axis, and the X-axis feed mechanism 39, Y-axis feed mechanism 38, and Z-axis feed mechanism 37 are fed to the feed control unit 23. The workpiece W on the table 36 is machined by the tool TL mounted on the spindle 34 as the spindle 34 and the table 36 move relatively in the three-dimensional space.

C. Vibration Source Estimation Device The vibration source estimation device 1 includes an acceleration sensor 2 provided at the lower end portion of the spindle head 33, an arithmetic processing device 3, and a display device 15 (see FIGS. 1 and 2).

  When the workpiece W is being machined by the tool TL, the acceleration sensor 2 detects a vibration acceleration generated by the machining, and outputs a vibration signal corresponding to the vibration acceleration. The detection of the vibration acceleration by the acceleration sensor 2 is always executed while the machining is being performed. The display device 15 includes a display as appropriate, and displays images and information on the display.

  The arithmetic processing unit 3 includes a frequency analysis unit 4, a vibration source estimation unit 5, a chatter detection unit 6, a load state evaluation unit 7, a tool monitoring unit 8, a display processing unit 9, a natural frequency storage unit 10, and a vibration source information storage. Unit 11, model data storage unit 12, and the like.

  Similar to the numerical control device 20, the arithmetic processing device 3 is constituted by a general computer having a CPU, a ROM, a RAM, and the like. The natural frequency storage unit 10, the vibration source information storage unit 11, and the model data storage unit 12 are composed of an appropriate storage medium such as a RAM, and include a frequency analysis unit 4, a vibration source estimation unit 5, a chatter detection unit 6, a load The functions of the state evaluation unit 7, the tool monitoring unit 8, and the display processing unit 9 are realized by a computer program.

  As shown in FIG. 3, the natural frequency storage unit 10 is a constituent member that may vibrate by machining using the machine tool 30, and at least one or more components used in the machine tool 30. Tools TL1 to TL4, tool holders TH1 to TH4 for holding the tools TL1 to TL4, one or more workpieces W1 to W2 scheduled to be processed by the machine tool 30, and a workpiece holding jig for holding the workpieces W1 to W2 Data relating to the natural frequency of each component such as the WJ and the spindle 34 of the machine tool 30 is stored.

  In FIG. 3, T1 to T4 are tool numbers set in the machine tool 30. For example, the tool number T1 is knitted from a tool TL1 and a tool holder TH1 that holds the tool TL1. Similarly, the tool number T2 is knitted from the tool TL2 and the tool holder TH2, the tool number T3 is knitted from the tool TL3 and the tool holder TH3, and the tool number T4 is knitted from the tool TL4 and the tool holder TH4.

  The natural frequencies of the spindle 34, the workpieces W1 to W2, the workpiece holding jig WJ, the tools TL1 to TL4 and the tool holders TH1 to TH4 are, for example, freely vibrated by a hammering or a vibration device, respectively. This free vibration is obtained by measuring with an accelerometer or the like, and analyzing the frequency of the measured vibration signal. Then, the data related to the natural frequency measured in this way is stored in the natural frequency storage unit 10 by an appropriate input device (not shown).

  As a matter of course, the number of tools TL and tool holders TH and the number of workpieces W are merely examples, and are not limited to those in this example. The components set to generate vibrations by machining are not limited to the main shaft 34, the workpiece W, the workpiece holding jig WJ, the tool TL, and the tool holder TH, and other components are included or vice versa. The workpiece holding jig WJ may not be included. In addition to the data related to the natural frequency, the natural frequency storage unit 10 stores data related to the number of blades of the tools TL1 to TL4.

  In the model data storage unit 12, three-dimensional model data relating to the machine tool 30, the tools TL1 to TL4, the tool holders TH1 to TH4, the workpieces W1 to W2, and the workpiece holding jig WJ are input to the input device (not shown). Z) is stored through. The model data is not limited to three-dimensional data, and may be two-dimensional data.

The frequency analysis unit 4 receives a signal related to vibration continuously output from the acceleration sensor 2, analyzes the received signal by Fourier analysis (frequency analysis) at a predetermined sampling interval, and generates vibration caused by processing. The vibration frequency and magnitude of acceleration (hereinafter simply referred to as “acceleration”) are calculated, and the calculation result, that is, the analysis result is transmitted to the vibration source estimation unit 5, the chatter detection unit 6, and the load state evaluation unit 7, respectively. 5 and 6 show an example of the analysis result (acceleration-vibration frequency data) by the frequency analysis unit 4. FIG. FIG. 5 shows an analysis result in a state where chatter vibration does not occur during machining. FIG. 6 shows an analysis result in a state in which chatter vibration occurs during machining, and the chatter frequency was 1100 [Hz]. 5 and 6, an end mill having a diameter of 16 [mm] and a number of blades of 4 is used as the tool TL, the cutting width is 4 [mm], the cutting depth is 10 [mm], The feed per blade was set to 0.1 [mm / blade]. Further, the spindle rotation speed in FIG. 5 was 1620 [min ⁻¹ ], and the spindle rotation speed in FIG. 6 was 1680 [min ⁻¹ ].

  The vibration source estimation unit 5 refers to the data stored in the natural frequency storage unit 10 at predetermined time intervals based on the acceleration-vibration frequency data analyzed by the frequency analysis unit 4. The component member having the natural frequency closest to the vibration frequency at which the magnitude of acceleration exceeds a predetermined threshold is estimated as the vibration source, and information related to the estimated component member is transmitted to the display processing unit 9 and estimated. The information which concerns on a structural member is stored in the said vibration source information storage part 11 with time information.

In addition to the tool TL and the workpiece W that directly become the machining site, the main vibration source of vibration generated during machining is the tool holder TH that holds the tool TL, the main shaft 34 that rotates the tool TL, and the workpiece holding jig. Constituent members that are indirectly connected to the processing site, such as WJ, are conceivable. When the vibration frequency generated by machining is close to any natural frequency of the tool TL, the workpiece W, the tool holder TH, the main shaft 34, the workpiece holding jig WJ, or the like, the component member has a predetermined threshold value. It is thought that it vibrates greatly beyond. Accordingly, when the magnitude of vibration (acceleration) generated during machining exceeds the threshold (reference value A) and vibrates greatly, the component having the natural frequency closest to the vibration frequency is the vibration source. Conceivable. The vibration source estimation unit 5 estimates the vibration source based on such a concept. For example, in FIG. 6, when the reference value A is 0.5 [m / s ² ], 1100 [Hz] is detected as the vibration frequency exceeding this, and the data stored in the natural frequency storage unit 10 is detected. A main shaft 34 is estimated as a vibration source.

  When the vibration source is estimated, the vibration source estimation unit 5 receives the tool number currently being executed and used from the NC program execution unit 21, and based on the received tool number, the natural frequency Referring to the storage unit 10, the tool TL and tool holder TH corresponding to the tool number are recognized as the currently used tool TL and tool holder TH, and the recognized natural frequency of the tool TL and tool holder TH is recognized. The vibration frequency analyzed by the frequency analysis unit 4 is compared.

  FIG. 4 shows an example of data estimated by the vibration source estimation unit 5 and stored in the vibration source information storage unit 11 in this way. In the data table shown in FIG. 4, a ◯ (flag) is attached to a component that is estimated to be a vibration source at each time t1 to t100 that represents an elapsed time from the start of machining. In addition, as shown in FIG. 5, when the magnitude of vibration is small at any frequency and the vibration source cannot be estimated with a significant difference as a result of analysis by the frequency analysis unit 4, in the data table shown in FIG. The flag is not attached to the time (see time t5 in FIG. 4).

  The chatter detecting unit 4 compares the magnitude of the vibration analyzed by the frequency analyzing unit 4 with a predetermined reference value B, and determines that the chatter phenomenon has occurred when the magnitude of the vibration exceeds the reference value B. The detection signal is transmitted to the display processing unit 9. This reference value B is larger than the reference value A and is set empirically.

In addition, when it is determined that the chatter phenomenon has occurred, the chatter detection unit 4 determines whether the chatter phenomenon is a forced chatter phenomenon or a regenerative chatter phenomenon. For example, in the case of the forced chatter phenomenon, the vibration frequency ω _k [Hz] is expressed by the following formula 3 when the rotation speed of the tool TL is S [min ⁻¹ ] and the number of blades of the tool TL is N.
(Formula 3)
ω _k = (N × S × k) / 60
However, k is an integer of 1 or more.

The chatter detection unit 4 is a forced chatter phenomenon if the vibration frequency ω analyzed by the frequency analysis unit 4 is within the range of the following formula 4, considering the predetermined margin α based on the formula 3. If it is out of the range of Expression 4, it is determined that the chatter phenomenon has occurred.
(Formula 4)
(Ω _k −α) ≦ ω ≦ (ω _k + α)
The rotation speed S of the tool TL is the rotation speed of the main shaft 34, and the chatter detection unit 4 receives the main shaft rotation speed currently being executed from the NC program execution unit 21 and recognizes it. Further, the chatter detecting unit 4 receives a tool number that is currently being executed and used from the NC program executing unit 21, and refers to the natural frequency storage unit 10 based on the received tool number, to determine the tool number. The number of blades of the tool TL corresponding to is recognized.

  The chatter detection unit 4 transmits a forced chatter detection signal to the display processing unit 9 when the detected chatter vibration is forced chatter, and when the detected chatter vibration is a playback chatter, playback is performed. Processing to transmit a chatter detection signal to the display processing unit 9 is performed.

  The load state evaluation unit 7 performs a process of integrating the frequency analysis results analyzed by the frequency analysis unit 4 and uses the integrated data and the data related to the natural frequency stored in the natural frequency storage unit 10. Based on this, the integrated value of the magnitude of vibration (acceleration) at the vibration frequency corresponding to the natural frequency of each constituent member, that is, the integrated value of the magnitude of vibration acting on each constituent member was applied to each constituent member. While evaluating as a load value, the image data for displaying the integrated value corresponding to each structural member, for example, image data as shown in FIG. 11 is generated and transmitted to the display processing unit 9. .

  The tool monitoring unit 8 monitors the state in which the NC program is executed by the NC program execution unit 21 and integrates the cutting times of the tools TL1 to TL4 used in the machine tool 30, and the tools TL1 to TL4 are used for the tool. It is determined whether the wear curve is in the initial wear period, the steady wear period, or the final wear period. In addition, the wear curve of the tool is such that the cutting edge wears rapidly to withstand a large pressure, or the cutting edge is rounded with a small chipping to withstand the cutting force, and the wear gradually progresses. It consists of three stages, a steady wear period, and a final wear period in which the resistance increases due to an increase in the roundness of the cutting edge and the wear rapidly increases with heat generation.

  The display processing unit 9 performs a process of displaying the model data stored in the model data storage unit 12 on the display of the display device 15, and the vibration source estimation unit 5 estimates the constituent members related to the vibration source. Then, the display device receives information related to the component estimated to be a vibration source from the vibration source estimator 5 so that the model related to the estimated component can be distinguished from the models of other components. 15 is displayed (hereinafter, this display is referred to as “identification display”). The display processing unit 9, the model data storage unit 12, and the display device 15 constitute a notification device.

  7 to 10 show examples of images displayed on the display of the display device 15. In FIG. 7, when the tool TL is estimated to be a vibration source, the model related to the tool TL is blacked out to be an image that can be distinguished from other components. Similarly, FIG. 8 is an image when the tool holder TH is estimated to be a vibration source, and the model related to the tool holder TH is blacked out. Further, FIG. 9 shows an image when the main axis 34 is estimated to be a vibration source, and the model related to the main axis 34 is blacked out. Further, FIG. 10 is an image when it is estimated that the workpiece W is a vibration source, and the model related to the workpiece W is blacked out. Although not particularly illustrated, when it is estimated that the work holding jig WJ is a vibration source, an image in which the work holding jig WJ is blacked out is displayed on the display.

  As a matter of course, the mode of identifying and displaying the model of the component member estimated as the vibration source is not limited to this, and may be displayed in another color or the component member estimated as the vibration source. Various modes are included, such as flashing the model and emphasizing the model of the component estimated as the vibration source with an arrow.

  In addition, when the vibration source estimation unit 5 estimates that the vibration source is the tool TL, the display processing unit 9 performs the tool monitoring for the tool TL (any one of the tools TL1 to TL4 in this example). When the determined wear period is the initial wear period with reference to the wear period determined by the unit 8, for example, in the display in FIG. 7, a character display indicating that the tool TL is in the initial wear period is performed. .

  In addition, when the chatter phenomenon is detected by the chatter detection unit 4 and the detection signal is received from the chatter detection unit 4, the display processing unit 9 displays the fact that the chatter phenomenon has occurred on the display and also displays the received detection. When the signal is a forced chatter detection signal, a character display that recommends “decrease cutting or feed rate” is displayed on the display, while the received detection signal is a playback chatter detection signal. In this case, a character display that recommends “increase the spindle rotational speed or decrease the spindle rotational speed” is displayed on the display. Of course, if a response other than these is conceivable, the response may be displayed in characters.

  Further, the display processing unit 9 is based on the data stored in the vibration source information storage unit 11, that is, the data related to the vibration source estimated in the past processing, and according to the time information, The model is displayed on the display so as to be distinguishable from models of other components. For example, in the example shown in FIG. 4, a model is displayed on the display along each elapsed time from time t1 to time t100 representing the elapsed time from the start of machining, and the model related to the vibration source estimated at each time is used. The identification display described above is performed. According to such a display, the change of the vibration source in the processing is redisplayed (replay display).

  Further, the display processing unit 9 performs a process of displaying an image for displaying an integrated value corresponding to each component received from the load state evaluation unit 7 on the display (see FIG. 11).

  According to the vibration source estimation apparatus 1 of the present example having the above configuration, when the NC program is executed by the NC program execution unit 21 and the workpiece W is machined by the machine tool 30, the machining is performed during that time. The acceleration sensor 2 detects the vibration (acceleration) generated by the above-mentioned, and a signal corresponding to the vibration is input from the acceleration sensor 2 to the frequency analysis unit 4. Then, the frequency analysis unit 4 analyzes continuously input vibration signals at a predetermined sampling interval, and transmits the analysis results to the vibration source estimation unit 5, the chatter detection unit 6, and the load state evaluation unit 7, respectively. .

  In the vibration source estimation unit 5, the inherent characteristic is determined at every predetermined time based on acceleration-vibration frequency data indicating the relationship between the magnitude (amplitude) of acceleration and the vibration frequency analyzed by the frequency analysis unit 4. With reference to the data stored in the frequency storage unit 10, the constituent member having the natural frequency closest to the vibration frequency is estimated as the vibration source, and information related to the estimated constituent member is transmitted to the display processing unit 9. In addition, information related to the estimated component is stored in the vibration source information storage unit 11 together with time information.

  The display processing unit 9 displays the model data stored in the model data storage unit 12 on the display of the display device 15, and the model of the component member estimated as the vibration source by the vibration source estimation unit 5. Is displayed so as to be distinguishable from the models of other constituent members, that is, identification display is performed.

  Thus, since the component estimated as the vibration source at the predetermined sampling interval is displayed on the display so as to be distinguishable from other components, the operator or the like can select the vibration source at that time from this display. While being able to recognize easily, it can grasp | ascertain the transition (transition) of a vibration source with time, and can recognize the characteristic on the vibration in the said process.

  Further, the operator or the like recognizes a specific component to be improved by recognizing the vibration source, such as an improvement in the processing, for example, a strength improvement of the work holding jig WJ or a change of the tool holder TH. In addition, the machining conditions can be objectively evaluated, and the machining conditions (spindle rotation speed, feed speed (feed amount per blade)), cutting width, cutting depth can be evaluated objectively. Etc.) can be improved.

  On the other hand, the chatter detection unit 4 determines whether or not chatter vibration has occurred from the analysis result in the frequency analysis unit 4, and if it is determined that chatter vibration has occurred, whether it is forced chatter vibration or It is determined whether the chatter vibration is a regenerative chatter vibration, and the determination result is transmitted to the display processing unit 9.

  Then, the display processing unit 9 receives the chatter detection signal from the chatter detection unit 4 and displays characters on the display indicating that the chatter phenomenon has occurred. When the received detection signal is a forced chatter detection signal, When the received detection signal is a regenerative chatter detection signal, the character display recommending “decrease the cut or decrease the feed rate” is displayed on the display, while “increase the spindle rotation speed”. A character display recommending “reducing the spindle rotational speed” or the like is displayed on the display.

  Thus, when chatter vibration occurs, the operator or the like can display that effect on the display, so that the current vibration is easily recognized as chatter vibration, and the estimated vibration source and Therefore, it is possible to take measures according to this. For example, when the cause (vibration source) of the chatter phenomenon is the workpiece W, the chatter phenomenon is suppressed by improving the holding mode of the workpiece W to a mode in which a vibration damping effect can be obtained in the subsequent machining. be able to. If the workpiece holding jig WJ is a vibration source, check the mounting state of the workpiece W or the workpiece holding jig WJ and correct it, or review the design of the workpiece holding jig WJ to stabilize it. If the tool holder TH is a vibration source, the tool holder TH can be changed to a tool holder TH having an excellent vibration damping effect, or the rotation speed of the tool can be predicted as described above. The chatter phenomenon can be suppressed by changing to a stable rotation speed, changing cutting conditions such as the cutting depth, or shortening the protruding amount of the tool. Similarly, when the main shaft 34 is a vibration source, the chatter phenomenon can be suppressed by changing the rotational speed of the tool TL to the predicted stable rotational speed or changing the cutting conditions such as the cutting depth. .

  In addition, when the vibration source is the tool TL and the chatter phenomenon is forced chatter, a character display that recommends "lower the notch or lower the feed rate" is displayed on the display, and the chatter phenomenon is reproduced. In such a case, a character display recommending “increase the spindle rotation speed or decrease the spindle rotation speed” is displayed on the display. Action can be taken.

  When the vibration source estimation unit 5 estimates that the vibration source is the tool TL, the display processing unit 9 refers to the wear period determined by the tool monitoring unit 8 for the tool TL. When the determined wear period is the initial wear period, for example, in the display in FIG. 7, the tool displays a letter indicating that the tool is in the initial wear period. Thereby, when the vibration of the tool TL is not chatter vibration, the operator or the like easily recognizes that the vibration is vibration caused by the initial wear period of the tool TL and it is not necessary to take measures such as tool replacement. be able to.

  Moreover, in the vibration source estimation apparatus 1 of this example, the time information based on the data related to the vibration source estimated in the past processing in the vibration source information storage unit 11 by the display processing unit 9 after the processing is completed. Thus, the model related to the vibration source estimated at each time can be identified and displayed, that is, replayed. Therefore, an operator or the like can visually recognize a vibration source that changes as the machining time elapses, including temporal elements such as the vibration time, and can re-verify the vibration phenomenon. .

  Further, the display processing unit 9 performs processing for displaying an image for displaying an integrated value (load evaluation) corresponding to each component received from the load state evaluation unit 7 on the display (see FIG. 11). Thereby, an operator or the like can objectively recognize the load state related to the vibration of each component member, and, for example, when it is determined that the service life can be exceeded, according to the load state, It is possible to take measures such as replacing corresponding components with new ones.

  As mentioned above, although one embodiment concerning the present invention was described, the mode which the present invention can take is not limited to this at all.

  For example, in the above example, the vibration source estimation unit 5 is configured to estimate a component having the natural frequency closest to the vibration frequency as the vibration source, but is not limited to such a configuration. . The vibration source estimator 5 estimates a plurality of constituent members that are ranked in order of high probability of being a vibration source in order from the natural frequency close to the vibration frequency, and displays information on the estimated constituent members in the display processing unit. 9, and the information related to the estimated component can be stored in the vibration source information storage unit 11 together with the time information. FIG. 12 shows an example in which the vibration sources from the first place to the third place are estimated in the descending order of probability. In FIG. 12, the numbers represent the ranks. The vibration source information storage unit 11 stores data illustrated in FIG.

  In this case, when the display processing unit 9 displays the model on the display, the display processing unit 9 displays the estimated plurality of constituent members on the display so that the rankings can be identified. For example, a plurality of estimated constituent members can be displayed in different colors according to the colors associated with each rank, and the relationship between the colors and the ranks can be displayed as a legend. Or you may make it attach | subject the number showing a rank to the model of each estimated component member.

  In this way, when a plurality of structural members are estimated as the vibration source, information related to the ranking of the possibility is displayed, so that the operator or the like is related to the vibration, It is possible to easily recognize how much they have as a vibration source, and it is possible to easily grasp a complicated vibration state.

  Further, in the above example, the load state evaluation unit 7 integrates the frequency analysis results analyzed by the frequency analysis unit 4 and calculates an integrated value of the magnitude of vibration at a frequency corresponding to the natural frequency of each component member. Although it is configured to evaluate as a load value acting on each constituent member, it is not limited to such a configuration.

  The load state evaluation unit 7 refers to the data stored in the vibration source information storage unit 11, and the frequency (number of times) of each component is estimated by the vibration source estimation unit 5 as a vibration source. And calculating the calculated frequency as a load value applied to each constituent member, generating image data for displaying the frequency (load value) corresponding to each constituent member, and the display processing unit 9 can be adopted. In this case, the frequency corresponding to each component is displayed on the display. Even in such an aspect, the operator or the like can objectively recognize the load state of the vibration applied to each component member, and can take measures according to the load state.

  In this embodiment, when the vibration source estimation unit 5 is configured to estimate a plurality of components as described above, the load state evaluation unit 7 includes the vibration source information storage unit. 11, for example, referring to the data as shown in FIG. 12, the frequency of each component is calculated for each rank, and the calculated frequency for each rank is displayed on the display. Good.

  In the above example, the vibration source estimation unit 5 is configured to estimate the vibration source based on the acceleration-vibration frequency data analyzed by the frequency analysis unit 4. However, the present invention is not limited to this. The vibration source estimation unit 5 is data calculated from the acceleration-vibration frequency data, and energy-vibration frequency data indicating the relationship between the magnitude (amplitude) of vibration energy and the vibration frequency, or vibration displacement data. The vibration source may be estimated from displacement-vibration frequency data indicating the relationship between the magnitude (amplitude) and the vibration frequency.

When the vibration acceleration is A [m / s ² ] and the vibration frequency at that time is f [Hz], the specific energy (energy per mass) E [m ² / s ² ] in the vibration is expressed by the following formula 5 Is represented by
(Formula 5)
E = (A / (2πf)) ² × (1/2)
Then, the energy-vibration frequency data can be calculated from the acceleration-vibration frequency data, and the vibration frequency having a large vibration energy can be recognized from the data, and the vibration source is estimated. can do.

Further, the vibration displacement D [m] with respect to the vibration acceleration A [m / s ² ] is expressed by the following Expression 6.
(Formula 6)
D = A / (2πf) ²
Then, the displacement-vibration frequency data can be calculated from the acceleration-vibration frequency data by the equation 6, and the vibration frequency having a large displacement can be recognized from the data, and the vibration source is estimated. be able to.

  Thus, the vibration source estimation unit 5 refers to the data in the natural frequency storage unit 10 based on the energy-vibration frequency data or the displacement-vibration frequency data, in each data. For example, it can be configured such that a component having a natural frequency closest to a vibration frequency whose magnitude exceeds the reference value A is estimated as a vibration source.

Incidentally, another example of acceleration-vibration frequency data analyzed by the frequency analysis unit 4 is shown in FIG. 13, energy-vibration frequency data calculated from this acceleration-vibration frequency data is shown in FIG. The data is shown in FIG. In this example, an end mill having a diameter of 16 [mm] and a number of blades of 4 is used as the tool TL, the cutting width is 4 [mm], the cutting depth is 10 [mm], and feed per blade is performed. The spindle rotational speed was set to 0.1 [mm / tooth] and 1990 [min ⁻¹ ]. In this case, the cutting edge passing frequency (TPF) was 133 [Hz].

In the acceleration-vibration frequency data shown in FIG. 13, for example, when the reference value A is 100 [m / s ² ], the estimated vibration source is obtained from the data shown in FIG. 3 stored in the natural frequency storage unit 10. The spindle 34 is ranked first, the workpiece holding jig WJ is ranked second, and the tool TL is ranked third. Since acceleration is considered to greatly affect the cutting edge of the tool, the vibration source that adversely affects the tool cutting edge can be recognized by estimating the vibration source based on the acceleration.

In the energy-vibration frequency data shown in FIG. 14, for example, if the reference value A is 5 × 10 ⁻⁴ [(m / s) ² ], the main shaft 34 is ranked first as an estimated vibration source. The work holding jig WJ is ranked second. Since the magnitude of vibration energy is thought to affect both the tool edge and the surface accuracy of the machined surface, the surface accuracy of the tool edge and machined surface can be estimated by estimating the vibration source based on this vibration energy. It is possible to recognize a vibration source that adversely affects the vibration.

Further, in the displacement-vibration frequency data shown in FIG. 15, when the reference value A is 1 × 10 ⁻⁶ [m], the spindle 34 is ranked first as an estimated vibration source, and the workpiece holding jig WJ is Ranked second. Since the displacement is considered to greatly affect the surface accuracy of the processed surface, the vibration source that adversely affects the surface accuracy of the processed surface can be recognized by estimating the vibration source based on the displacement. In addition, since chatter vibration has a frequency higher than the cutting edge passing frequency, in this example, a vibration component of 133 [Hz] or less is ignored as noise.

  Alternatively, the vibration source estimation unit 5 comprehensively evaluates the estimated vibration source using two or more data selected from the acceleration-vibration frequency data, energy-vibration frequency data, and displacement-vibration frequency data. It may be configured to. For example, it is good also as a comprehensive ranking by adding the ranking of the vibration sources estimated from each data.

  In the above example, the arithmetic processing unit 3 of the vibration source estimation apparatus 1 is configured as a separate unit from the numerical control unit 20, but is not limited to this, and the arithmetic processing unit 3 is replaced with the numerical control unit 20. A built-in configuration may be used. Further, a display provided on the operation panel of the machine tool 30 may be used as the display device 15.

DESCRIPTION OF SYMBOLS 1 Vibration source estimation apparatus 2 Acceleration sensor 3 Arithmetic processing apparatus 4 Frequency analysis part 5 Vibration source estimation part 6 Chatter detection part 7 Load state evaluation part 8 Tool monitoring part 9 Display processing part 10 Natural frequency storage part 11 Vibration source information storage part DESCRIPTION OF SYMBOLS 12 Model data memory | storage part 15 Display apparatus 20 Numerical control apparatus 21 NC program execution part 22 Spindle control part 23 Feed control part 30 Machine tool 34 Spindle TL Tool TH Tool holder W Work WJ Work holding jig

Claims (9)

An apparatus for estimating a vibration source of vibration generated during machining using a machine tool,
A natural frequency storage unit that stores natural frequencies of at least a tool, a tool holder that holds the tool, a workpiece, and a component that includes the main shaft of the machine tool, which generate vibrations by processing;
A vibration detection unit that detects vibration acceleration of the structural member generated by the processing and outputs a signal related to the detected vibration acceleration;
A frequency analysis unit for analyzing a frequency of a vibration signal output from the vibration detection unit;
The acceleration-vibration frequency data indicating the relationship between the vibration acceleration magnitude and the vibration frequency analyzed by the frequency analysis unit, or the energy indicating the relation between the vibration energy magnitude calculated from the acceleration-vibration frequency data and the vibration frequency. -Vibration frequency data, or acceleration-displacement indicating the relationship between the magnitude of vibration displacement calculated from the vibration frequency data and the vibration frequency-based on at least one of the vibration frequency data, the natural frequency Referring to data stored in the storage unit, a vibration source estimation unit that estimates a component considered as a vibration source;
A vibration source estimation device, comprising: a notification device for notifying outside of information relating to a component estimated as a vibration source by the vibration source estimation unit. The notification device is configured based on a display that displays an image, a model data storage unit that stores two-dimensional or three-dimensional model data of the component, and model data stored in the model data storage unit. A display processing unit configured to display a model related to the member on the display,
The display processing unit is further configured to display a model of a component member estimated by the vibration source estimation unit on the display so as to be distinguishable from a model of another component member. Item 2. The vibration source estimation apparatus according to Item 1. A vibration source information storage unit that stores information related to the components estimated by the vibration source estimation unit;
The vibration source estimation unit is configured to estimate the vibration source every predetermined time, and to store information on the estimated component member together with time information in the vibration source information storage unit,
Based on the information stored in the vibration source information storage unit, the display processing unit can identify the model of the component member estimated by the vibration source estimation unit from the model of the other component member according to the time information. The vibration source estimation apparatus according to claim 2, wherein the vibration source estimation apparatus is configured to be displayed on the display. The vibration source estimator is configured to estimate a plurality of constituent members ranked with high possibility as a vibration source,
The said alerting | reporting apparatus is comprised so that the some structural member estimated by the said vibration source estimation part may be alert | reported with the information which concerns on the ranking. Vibration source estimation device. While integrating at least one of the acceleration-vibration frequency data, energy-vibration frequency data, or displacement-vibration frequency data, the accumulated data and the data stored in the natural frequency storage unit; And further comprising a load state evaluation unit for evaluating the load state acting on each component member,
5. The vibration source estimation according to claim 1, wherein the notification device is configured to display information related to a load state of each constituent member evaluated by the load state evaluation unit. apparatus. A load state evaluation unit that calculates the frequency at which each component member is estimated to be a vibration source by the vibration source estimation unit, and evaluates the load state that has acted on each component member based on the calculated frequency. In addition,
The vibration source estimation apparatus according to claim 3, wherein the notification device is configured to display information related to a load state of each component evaluated by the load state evaluation unit. A chatter detecting unit for detecting whether or not chatter phenomenon has occurred in the tool from the acceleration-vibration frequency data analyzed by the frequency analyzing unit;
The vibration source estimation device according to claim 1, wherein the notification device is configured to notify the user when chatter is detected by the chatter detection unit. The chatter detecting unit is further configured to determine whether the detected chatter phenomenon is a regenerative chatter phenomenon or a forced chatter phenomenon based on the acceleration-vibration frequency data analyzed by the frequency analyzing unit. ,
When the chatter is detected by the chatter detector, the alerting device informs that at least one of lowering the notch or lowering the feed rate is taken, and reproducing by the chatter detector. 8. The vibration source estimation according to claim 7, wherein, when chatter is detected, the vibration source estimation is configured to notify that at least one of raising or lowering the spindle rotational speed is taken. apparatus. A tool monitoring unit for monitoring the operating state of the tool;
When the vibration source estimation unit estimates that the tool is a vibration source, the notification device determines that the tool is in an initial wear period from the operating state of the tool monitored by the tool monitoring unit. 9. The vibration source estimation apparatus according to claim 1, wherein the vibration source estimation apparatus is configured to notify that effect when it is performed.

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