JP2018094602A - Method and device for managing service life of ultrasonic joining tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional method, for restricted cases in which an ultrasonic joining tool has a knurled surface, that detection of the width of a protrusion tip is difficult since a camera image is used.SOLUTION: Provided is a service life managing method in which: an advancing and retracting drive mechanism 5 of a horn 2 and a position detecting mechanism 6 of the horn 2 are used in joining a workpiece W by holding the workpiece W between an anvil 4 and the horn 2 and applying ultrasonic oscillation to the horn 2; and an oscillation start position P3 of the horn 2 is calculated on the basis of a difference between a total displacement amount ABS of the horn 2 from an original position P1 until arriving at a joining completion position P2, and a sinking amount TC of the horn 2 during joining, and further a tool service life of the anvil 4 is estimated on the basis of a change amount of the oscillation start position P3 of the horn 2, every time a workpiece W is joined. In the service life managing method, a tool service life is grasped without being influenced by a surface form of an ultrasonic joining tool and without using a camera, and then a proper tool replacement timing is determined.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a life management method and a life management device used to determine the replacement time of an ultrasonic welding tool.

  2. Description of the Related Art Conventionally, as a method for managing the life of an ultrasonic welding tool, there is one described in Patent Document 1 under the name of an ultrasonic welding tool determination device and its method. In the determination method described in Patent Literature 1, an anvil and a horn knurled surface, which are ultrasonic welding tools, are imaged by a camera. The knurled surface is a contact surface with the workpiece and has a surface form in which a large number of protrusions are arranged. In the determination method, the width of the protrusion tip of the knurled surface is obtained from the captured image, and the replacement time of the ultrasonic welding tool is determined from the width of the protrusion tip using a discriminant function determined in advance.

JP 2010-207837 A

  However, the conventional determination method as described above is limited to the case where the ultrasonic welding tool has a knurled surface, and the gloss changes with the progress of wear and adhesion of the knurled surface. In some cases, it is difficult to detect the width of the tip of the protrusion. Therefore, there is a need to study a new life management method that does not use a camera.

  The present invention has been made in view of the above-mentioned conventional situation, and is not affected by the surface form of the ultrasonic welding tool, and grasps the tool life without using a camera or the like, and performs appropriate tool replacement. It is an object of the present invention to provide a life management method and a life management device for an ultrasonic welding tool that can determine the timing of the above.

  The life management method of the ultrasonic joining tool according to the present invention is a method used when joining members to be joined by sandwiching a plurality of members to be joined between an anvil and a horn and applying ultrasonic vibration to the horn. It is. This life management method uses an advancing / retreating drive mechanism for moving the horn forward / backward with respect to the anvil and a position detection mechanism for detecting the position of the horn advanced / retreated by the advancing / retreating drive mechanism. The life management method is based on the difference between the total displacement amount of the horn from the original position to the joining completion position and the subtraction amount that is the displacement of the horn at the time of joining each time the members to be joined are joined. The horn oscillation start position is calculated, and the tool life of the anvil is estimated based on the amount of change in the horn oscillation start position after the start of use of the anvil.

  The ultrasonic welding tool life management device according to the present invention is a device for managing the tool life of an anvil used for ultrasonic welding. This life management device is operated by inputting an advance / retreat drive mechanism for moving the horn forward and backward with respect to the anvil, a position detection mechanism for detecting the position of the horn advanced / retracted by the advance / retreat drive mechanism, and a detection signal of the position detection mechanism. A management control unit. In the life management device, the management control unit starts oscillating the horn based on the difference between the total displacement amount of the horn from the original position to the joining completion position and the sinking amount that is the displacement of the horn at the time of joining. The function to calculate the position, the function to estimate the tool life of the anvil based on the change amount of the horn oscillation start position after the start of use of the anvil, and the change amount of the horn oscillation start position after the start of use of the anvil And a function of determining the tool life of the anvil at the present time.

  The life management method and life management device for an ultrasonic welding tool according to the present invention adopts the above-described configuration, so that the tool life is estimated without using a camera or the like without being influenced by the surface form of the ultrasonic welding tool. Thus, it is possible to determine an appropriate tool change time.

1 is a side view illustrating an ultrasonic bonding apparatus to which a life management method and a life management apparatus according to the present invention are applied. It is a side view explaining the displacement of the horn in the ultrasonic bonding apparatus shown in FIG. It is a flowchart explaining 1st Embodiment of the lifetime management method of the ultrasonic joining tool concerning this invention. It is a graph which shows the relationship between the number of dots of ultrasonic bonding, and the variation | change_quantity of an oscillation start position. It is a flowchart explaining 2nd Embodiment of the lifetime management method. It is a flowchart explaining 3rd Embodiment of the lifetime management method. It is a graph which shows the relationship between the displacement of a horn, and descending speed.

<First Embodiment>
The ultrasonic bonding apparatus shown in FIG. 1 includes a head 3 having a horn 2 in an apparatus main body 1 so that the head 3 can be moved up and down, and an anvil 4 below the horn 2. Further, the ultrasonic bonding apparatus includes an advance / retreat drive mechanism 5 for moving the horn 2 forward and backward with respect to the anvil 4 and a position detection mechanism for detecting the position of the horn 2 advanced / retracted by the advance / retreat drive mechanism 5. In this embodiment, the lowering and raising of the horn 2 are the forward and backward directions with respect to the anvil 4.

  The advancing / retreating drive mechanism 5 is accommodated in the apparatus main body 1 and is not shown, but includes actuators that are drive sources, a guide mechanism for raising and lowering, and the like. Further, the position detection mechanism of this embodiment is a linear encoder 6 that detects the position of the head 3, and the position of the horn 2 can be substantially detected by detecting the position of the head 3.

  The horn 2 has a processed surface 2A that comes into contact with the workpiece W at its lower end. The head 3 includes a horn 2 at one end, and a transducer 7 for applying horizontal ultrasonic vibration to the horn 2 at the other end. The anvil 4 has a processed surface 4A that comes into contact with the workpiece W at its upper end, and is detachably fixed to the apparatus main body 1 by a fixing jig 8.

  The workpiece W is, for example, a plurality of metal members to be joined Wa and Wb, which are joined in a state in which they are stacked. In addition, although the workpiece W in the illustrated example is composed of two members to be joined Wa and Wb, it is needless to say that the number of workpieces may be larger than that. This workpiece W is carried onto the anvil 4 by a conveying means (not shown).

  Furthermore, the ultrasonic bonding apparatus includes a management control unit 10 that inputs and calculates a detection signal of the linear encoder (position detection mechanism) 6, and a display unit 11 that displays a result of estimation and determination by the management control unit 10. Yes. The management control unit 10 is a computer, and inputs a detection signal of the linear encoder 6 and outputs a drive signal to the advance / retreat drive mechanism 5 and the transducer 7. The display unit 11 is, for example, a monitor, and displays a calculation result by the management control unit 10 as a tool life or replacement time.

The management control unit 10 is programmed with the following functions 01 to 03 as computer software. Moreover, the position and displacement amount of the horn 2 at the time of joining are shown in FIG.
Function 01: Based on the difference between the total displacement amount ABS of the horn 2 from the original position P1 to the joining completion position P2 and the subtraction amount TC that is the displacement of the horn 2 at the time of joining, the oscillation start position P3 of the horn 2 is calculate.
Function 02: Estimates the tool life of the anvil 4 based on the amount of change in the oscillation start position P3 of the horn 2 after the start of use of the anvil 4.
Function 03: The tool life of the anvil 4 at the current time is determined based on the amount of change in the oscillation start position P3 of the horn 2 after the start of use of the anvil 4.

Further, the management control unit 10 is programmed with functions 04 to 07 used in second and third embodiments, which will be described later, as computer software.
Function 04: Detects the forward position P4 of the horn 2 when contacting the anvil 4.
Function 05: Calculates the moving speed of the horn 2 that moves forward by the advance / retreat drive mechanism 5.
Function 06: Detects the forward position P5 of the horn 2 when it comes into contact with the member (workpiece W) based on the change in the moving speed of the horn 2.
Function 07: The wear amount of the anvil 4 is determined based on the forward positions P4 and P5 of the horn 2.

  In this embodiment, the life management device of the ultrasonic bonding apparatus includes the advancing / retreating drive mechanism 5, the linear encoder (position detection mechanism) 6, the management control unit 10 having functions 01 to 07, the display unit 11, and the like. It consists of Note that the ultrasonic bonding apparatus may include a pressure detector that detects the pressure applied by the horn 2 to the workpiece W.

  In the ultrasonic bonding apparatus having the above-described configuration, the work W composed of a plurality of members to be bonded Wa and Wb is loaded onto the anvil 4, and then the horn 2 is lowered (advanced) together with the head 3 by the advance / retreat driving mechanism 5. While sandwiching the workpiece W between the anvil 4 and the horn 2, horizontal ultrasonic vibration is applied to the horn 2 by the transducer 7 when the pressure applied by the horn 2 reaches a predetermined value. As a result, the workpieces W and Wb are rubbed at the contact interface, and the workpieces Wa and Wb are integrated at a low temperature below the melting point of the material by atomic diffusion.

  Here, when the work of joining the workpieces W is repeated, the ultrasonic joining apparatus wears on the processing surfaces 2A and 4B of the horn 2 and the anvil 4 which are joining tools, and in particular, the processing surface 4A of the anvil 4 is worn. It is remarkable. For this reason, it is necessary for the ultrasonic bonding apparatus to appropriately determine the replacement time of the anvil 4, and the tool life is managed by the life management method described below.

  That is, the life management method of the ultrasonic welding tool has, as a basic configuration, the total displacement amount ABS of the horn 2 from the original position P1 to the welding completion position P2 each time the members to be joined Wa and Wb are joined, The oscillation start position P3 of the horn 2 is calculated based on the difference from the subtraction amount TC, which is the displacement of the horn 2 at the time of joining. The life management method estimates the tool life of the anvil 4 based on the amount of change in the oscillation start position P3 of the horn 2 after the start of use of the anvil 4. In the life management method, the tool life of the anvil 4 at the current time is determined based on the change amount of the oscillation start position P3.

Next, the lifetime management method will be described using the flowchart shown in FIG.
In step S1 of FIG. 3, ultrasonic bonding of the workpiece W is performed. In the ultrasonic bonding, as a general control method, any one of the oscillation time of ultrasonic vibration, the output at the time of oscillation, the displacement of the head 3 at the time of oscillation or the start of bonding, and the energy at the time of oscillation reaches a set value. Is done.

  At this time, in ultrasonic bonding, there is an unavoidable variation (error) in the thickness of the workpiece W and the mechanical operation of the advance / retreat drive mechanism 5, so the oscillation start position P <b> 3 of the horn 2 varies. On the other hand, in order to accurately determine the tool life of the anvil 4, in order to eliminate the inevitable variation described above, the moving average of the oscillation start position P3 is at least within the range of several to several hundred points. Need to figure out.

  Therefore, in the life management method, every time the workpieces W are joined, the subtraction amount TC that is the displacement of the horn 2 at the time of joining is measured in step S2. The sinking amount TC can be calculated using a set value such as an oscillation time used in the above-described ultrasonic bonding control method and a detected value of the linear encoder 6. However, the sinking amount TC includes the inevitable variation described above.

  Next, in the life management method, in step S3, the total displacement amount ABS of the horn 2 from the original position P1 to the joining completion position P2 is measured by the linear encoder 6, and in step S4, the total displacement amount ABS of the horn 2 is calculated. The oscillation start position P3 is calculated from the difference (ABS-TC) from the sinking amount TC.

  Here, in the ultrasonic joining, when the wear of the anvil 4 proceeds (the processed surface 4A is lowered), the original position P1 of the horn 2 is constant, so that the joining completion position P2 of the horn 2 is lowered and the total displacement amount ABS is reached. Will also increase. Thereby, in ultrasonic bonding, as shown in FIG. 4, the amount of change in the oscillation start position P3 of the horn 2 increases as the number of hit points increases.

  Therefore, in the life management method, in step S5, it is determined whether the change amount of the oscillation start position P3 after the start of use of the anvil 4 is within a specified value. If it is determined in step S5 that it is not within the predetermined value (No), it is due to the occurrence of significant wear or chipping on the processed surface 4A of the anvil 4, so that the process proceeds to step S10 and the tool is changed to the display unit 11. indicate.

  On the other hand, if it is determined in step S5 that the value is within the specified value (Yes), the process proceeds to step S6 to obtain an approximate expression of the change of the oscillation start position P3 depending on the number of hit points, and then in step S7, the approximate expression is obtained. The number of hit points until the oscillation start position P3 reaches a predetermined value is calculated.

  The approximate expression in step S6 can be obtained from the relationship between the number of hit points and the amount of change in the oscillation start position P3 shown in FIG. That is, as indicated by a white line in FIG. 4, it is known in advance that the moving average of the oscillation start position P3 increases as the number of hit points increases. Therefore, if the moving average of the oscillation start position P3 is grasped at least within a range of several to several hundreds of points from the start of use of the anvil 4, the number of points until the oscillation start position P3 reaches a predetermined value in the future is calculated. obtain. The default value in step S7 is a value exemplified by a dotted line in FIG. 4 and is a value that requires tool change of the anvil 4 and also shows the number of hit points that require tool change.

  Thereafter, the life management method determines whether or not the number of hitting points until reaching the predetermined value of the oscillation start position P3 in step S8 is within the specified number of hitting points. If it is determined in step S8 that the number of hit points is within the prescribed number of hits (Yes), the anvil 4 can be used continuously (less wear), so the process proceeds to step S1 to perform a new joining operation.

  If it is determined in step S8 that the number of hit points is not within the specified number of hits (No), it indicates that the tool life of the anvil 4 is near, so that the process proceeds to step S9 and the tool is displayed by the display unit 11 or another alarm device. An exchange alarm is output, and finally tool exchange is displayed on the display unit 11 in step S10.

  That is, in the above life management method, the current tool life of the anvil 4 is determined in step S5, and the future tool life of the anvil 4 is estimated in step S8. Further, since the life management method and the life management device described above use the advance / retreat drive mechanism 5, the linear encoder 6, and the management controller (functions 01 to 03) 7, the machining surface 4A of the anvil 4 may be a knurled surface. However, the tool life can be estimated and determined even with other surface forms.

  In this way, the life management method and the life management device estimate the tool life of the anvil 4 based on the amount of change in the oscillation start position P3 of the horn 2 after the start of use of the anvil 4, so that the machining of the anvil 4 is performed. Regardless of the surface form of the surface 4A, it is possible to grasp the tool life without using a camera and to determine an appropriate tool replacement time. In addition, the life management method and the life management apparatus described above can determine an appropriate tool change timing by any control method of general ultrasonic bonding.

  Further, since the life management method and the life management device described above determine the tool life of the anvil 4 based on the amount of change in the oscillation start position P3 of the horn 2 after the start of use of the anvil 4, the surface form of the anvil 4 is determined. Therefore, it is possible to determine an appropriate tool change time without depending on the camera and without using a camera. In addition, when a defect such as a defect occurs on the processed surface 4A of the anvil 4, the oscillation start position P3 changes rapidly, so that the defect can be detected quickly. In addition, since the life management device employs the display unit 11, the operator can easily grasp the life and replacement time of the joining tool.

  Furthermore, the above-mentioned life management method and life management apparatus are also suitable for joining workpieces W in which a number of metal sheets are stacked as members to be joined, for example. In such a workpiece W, the entire thickness of the workpiece W is likely to vary, and the sinking amount TC of the horn 2 at the time of joining increases. On the other hand, the life management method and the life management apparatus described above eliminate variations in the thickness of the workpiece W, etc., so that the tool life is well estimated and determined even when the stacked workpieces W are joined. be able to.

Second Embodiment
FIG. 5 is a flowchart for explaining a second embodiment of the method for managing the life of the ultrasonic welding tool according to the present invention. The ultrasonic bonding apparatus shown in FIG. 1 can be applied, and the position and displacement of the horn 2 are as shown in FIG.

  In the life management method of this embodiment, the horn 2 that moves forward (down) without applying ultrasonic vibrations is brought into contact with the anvil 4, and the forward position P4 of the horn 2 at that time is detected, and the forward position of the horn 2 is detected. Based on P4, the amount of wear of the processed surface 4A of the anvil 4 is determined. Therefore, this life management method is desirably performed at the start of use of the anvil 4, for example, and periodically for each predetermined number of hit points.

  The life management device of this embodiment is configured by the advance / retreat drive mechanism 5, the linear encoder (position detection mechanism) 6, and the management control unit 10 described in the first embodiment. In addition, the management control unit 10 detects a forward position P4 of the horn 2 when it comes into contact with the anvil 4 (04), and determines a wear amount of the anvil 4 based on the forward position P4 of the horn 2 (07). ).

  That is, in the life management method, when processing is started in step S11, the horn 2 is advanced (lowered) in a state where ultrasonic vibration is not applied by the advance / retreat drive mechanism 5 in step S12, and the horn 2 is moved to the anvil 4 in step S13. Contact. In step S14, the linear encoder (position detection mechanism) 6 detects the forward position P4 of the horn 2, and in step S15, the amount of wear of the anvil 4 is calculated.

  That is, in the above life management method, the forward position P4 of the horn 2 that is in contact with the anvil 4 indicates the height of the processed surface 4A of the anvil 4. Therefore, the initial advance position P4 of the horn 2 may be detected at the start of use of the anvil 4, and the advance position P4 may be similarly detected at an appropriate time after the start of use. At that time, if the wear of the processed surface 4A of the anvil 4 progresses, that is, the height of the processed surface 4A decreases, the advance position P4 of the horn 2 is lowered accordingly, and the advance position P4 of the horn 2 from the original position P1. The distance to increase. Thereby, the amount of wear of the anvil 4 can be calculated from the difference between the initial value of the forward position P4 of the horn 2 and the detected value after use.

  In the life management method described above, in step S16, it is determined whether the amount of wear of the anvil 4 is within the specified value. If it is within the specified value (Yes), the anvil 4 can be used continuously. In step S17, the process ends. If it is not within the specified value in Step S16 (No), it is determined that the processed surface 4A of the anvil 4 is significantly worn or missing, and tool change is displayed on the display unit 11 in Step S17.

  As described above, according to the life management method and the life management apparatus, the wear state of the processed surface 4A of the anvil 4 can be directly detected without being affected by the variation in the sinking amount TC of the horn 2. Can do. In addition, if the above-mentioned life management method is periodically performed for each predetermined number of hit points and the data is accumulated, the tool life estimation and determination described in the first embodiment contributes to higher accuracy. be able to.

<Third Embodiment>
FIG. 6 is a flowchart for explaining a third embodiment of the method for managing the life of the ultrasonic welding tool according to the present invention. The ultrasonic bonding apparatus shown in FIG. 1 can be applied, and the position and displacement of the horn 2 are as shown in FIG.

  In the life management method of this embodiment, the moving speed of the horn 2 that moves forward by the advance / retreat drive mechanism 5 is calculated, and the horn 2 when contacting the member to be joined (work W) based on the change in the moving speed of the horn 2. The forward position P5 of the anvil 4 is detected based on the forward position P5 of the horn 2.

  In addition, the life management apparatus of this embodiment is configured by the advance / retreat drive mechanism 5, the linear encoder (position detection mechanism) 6, and the management control unit 10 described in the first embodiment. The management control unit 10 has a function (05) for calculating the moving speed of the horn 2 advanced by the advance / retreat driving mechanism 5 and the horn when contacting the member (workpiece W) based on a change in the moving speed of the horn 2. 2 (06), and a function (07) for determining the amount of wear of the anvil 4 based on the forward position P5 of the horn 2.

  Note that the function 07 in this embodiment is based on the forward position P4 of the horn 2 in contact with the workpiece W in the second embodiment, whereas the forward position P5 of the horn 2 in contact with the workpiece W is determined as a criterion. It is said. That is, the detection itself of the forward position (P4, P5) of the horn 2 is substantially the same except that the presence or absence of the workpiece W is different.

  That is, in the life management method, when the joining operation is started in step S21, the moving speed of the horn 2 is calculated based on the detection value and time of the linear encoder 6 in step S22. (To-be-joined member) The advance position P5 of the horn 2 when it contacts W is detected.

  Here, FIG. 7 is a graph showing the relationship between the displacement (movement amount) of the horn 2 and the lowering speed (movement speed / forward speed) of the horn 2. As is clear from the figure, the moving speed of the horn 2 rises and becomes almost constant as the horn 2 descends (advances), and decreases rapidly when it contacts the workpiece W. From such a change in the moving speed of the horn 2, the contact position P5 to the workpiece W can be detected.

  Thereafter, the life management method calculates the wear amount of the anvil 4 in step S24. That is, in the above-mentioned life management method, the forward position P5 of the horn 2 in contact with the workpiece W indicates the height of the workpiece W. At this time, the thickness of the workpiece W is known in advance. A height of 4A can be detected. Accordingly, if the wear of the processed surface 4A of the anvil 4 has progressed, the advance position P5 of the horn 2 in contact with the work W is also lowered, so the original position P1 of the horn 2, the advance position P5 in contact with the work W, and the work W The wear amount of the anvil 4 can be calculated based on the thickness of the anvil.

  Then, the life management method determines whether the amount of wear of the anvil 4 is within a predetermined value in step S25, and if it is within the specified value (Yes), it is determined that the anvil 4 can be continuously used in step S26. End the process. If it is not within the specified value in step S25 (No), it is determined that the processed surface 4A of the anvil 4 is significantly worn or missing, and tool change is displayed on the display unit 11 in step S27.

  According to the above-mentioned life management method and life management device, the wear status of the processed surface 4A of the anvil 4 is detected without being affected by the variation in the sinking amount TC of the horn 2, and the tool change time is appropriately set. Can be judged. Therefore, it is also suitable for life management in the joining of the laminated workpieces W whose thickness is likely to vary.

  Further, in the above-described life management method, for example, in the processing step of the first embodiment shown in FIG. 3, the advance position P5 can be used as the joining start position when measuring the sinking amount TC in step S2. It is. Thereby, for example, the tool life can be estimated and determined without using sensors for detecting the pressure applied by the horn 2 to the workpiece W.

  The life management method and life management device of the ultrasonic welding tool according to the present invention are not limited to the above embodiments, and the configuration can be changed as appropriate without departing from the gist of the present invention. Is possible.

  The above-mentioned life management method can also theoretically estimate and determine the life of the horn 2 that is an ultrasonic welding tool. However, in ultrasonic welding, as described above, the wear of the anvil is more conspicuous than that of the horn, and it is preferable to raise and lower the horn while fixing the anvil for the convenience of loading work, etc. It has an excellent effect on life management of anvils.

W Work Wa, Wb Joined member 2 Horn 4 Anvil 5 Reciprocating drive mechanism 6 Linear encoder (position detection mechanism)
10 Management Control Unit 11 Display Unit

Claims (7)

When sandwiching a plurality of members to be joined between the anvil and the horn and applying ultrasonic vibration to the horn, the members to be joined are joined,
Using an advancing / retreating drive mechanism for moving the horn forward and backward with respect to the anvil, and a position detection mechanism for detecting the position of the horn advanced / retracted by the advancing / retreating drive mechanism,
Each time the members to be joined are joined, the oscillation start position of the horn is determined based on the difference between the total displacement amount of the horn from the original position to the joining completion position and the sinking amount that is the displacement of the horn at the time of joining. Calculate
A life management method for an ultrasonic welding tool characterized by estimating a tool life of an anvil based on a change amount of a horn oscillation start position after the start of use of an anvil.   The life management method for an ultrasonic welding tool according to claim 1, wherein the tool life of the anvil at the current time is determined based on a change amount of the oscillation start position of the horn after the start of use of the anvil. The horn that moves forward without applying ultrasonic vibrations is brought into contact with the anvil, and the forward position of the horn at that time is detected.
The life management method for an ultrasonic welding tool according to claim 1 or 2, wherein the wear amount of the anvil is determined based on the advance position of the horn. Calculate the moving speed of the horn moving forward by the advance / retreat drive mechanism,
Based on the change in the moving speed of the horn, the forward position of the horn when it comes into contact with the member to be joined is detected,
The life management method for an ultrasonic welding tool according to claim 1 or 2, wherein the wear amount of the anvil is determined based on the advance position of the horn. A device for managing the tool life of an anvil used for ultrasonic bonding,
An advancing / retracting drive mechanism for advancing and retracting the horn relative to the anvil;
A position detection mechanism for detecting the position of the horn advanced / retracted by the advance / retreat drive mechanism;
A management control unit that inputs and calculates a detection signal of the position detection mechanism,
The management control unit calculates the horn oscillation start position based on the difference between the total displacement amount of the horn from the original position to the bonding completion position and the subtraction amount that is the displacement of the horn at the time of bonding;
A function for estimating the tool life of the anvil based on the amount of change in the oscillation start position of the horn after the start of use of the anvil;
A life management device for an ultrasonic welding tool, comprising: a function for determining a tool life of an anvil at a current time based on a change amount of an oscillation start position of a horn after the start of use of an anvil. The management control unit detects the advance position of the horn when it contacts the anvil;
A function for calculating the moving speed of the horn moving forward by the advance / retreat drive mechanism;
A function of detecting the forward position of the horn when contacting the member to be joined based on a change in the moving speed of the horn;
6. The life management device for an ultrasonic welding tool according to claim 5, further comprising a function of determining an amount of wear on the anvil based on each forward position of the horn.   The life management apparatus for an ultrasonic welding tool according to claim 6, further comprising a display unit that displays a result of estimation and determination by the management control unit.

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