JP5038989B2 - Ultrasonic metal bonding machine - Google Patents

Description

Present invention relates to an ultrasonic metal joining machine that is used to join two metal plates.

  Conventionally, in order to join two metal plates (for example, electrode terminals), for example, an ultrasonic metal bonding machine as described in Patent Document 1 is used.

  This ultrasonic metal bonding machine includes an anvil 1 and a horn 5. In order to join the two metal plates 2 and 3 using this ultrasonic metal joining machine, first, the two metal plates 2 and 3 are placed on the anvil 1 in a state where they are stacked one above the other. Next, the operator drives the ultrasonic metal bonding machine, and the pressure device of the ultrasonic metal bonding machine presses the horn 5 downward, whereby the horn 5 and the anvil 1 make two metal plates 2, 3 is pinched.

Further, in this state, when the ultrasonic vibrator of the ultrasonic metal bonding machine is driven, the horn 5 is ultrasonically vibrated in the horizontal direction, and ultrasonic vibration is applied from the horn 5 to the upper metal plate 2. The metal plates 2 and 3 are slid right and left. As a result, impurities such as an oxide film adhering to the contact surfaces of the two metal plates 2 and 3 are removed, and frictional heat is generated in the overlapping portion where the two metal plates 2 and 3 are overlapped. Due to this frictional heat, a sudden plastic flow is generated in the superposed part, so that the superposed part is joined to obtain a joined metal plate. The following three methods are known as methods for stopping the ultrasonic vibration of the horn.
(1) The ultrasonic vibration is stopped when a preset driving time of the horn has elapsed.
(2) The ultrasonic vibration is stopped when a preset amount of sinking of the upper metal plate is reached.
(3) The ultrasonic vibration is stopped when a preset amount of ultrasonic vibration energy is reached.
Japanese Patent Laid-Open No. 5-115986

  However, in the above methods (1) to (3), the condition values (driving time, sinking amount, energy amount) are set in advance before the ultrasonic bonding machine is driven. For this reason, when the condition value is set to be larger than necessary, the horn is ultrasonically vibrated even when the joining of the metal plates is completed. Therefore, the anvil and the lower metal plate are rubbed unnecessarily, and the bonded metal plate suffers damage such as thinning of the lower metal plate, so that the bonding strength is not stable.

This invention is made | formed in view of this conventional subject, and it aims at providing the ultrasonic metal joining machine which can obtain the joining metal plate with stable joining strength.

  In order to solve the above-mentioned problem, in the ultrasonic metal bonding machine according to claim 1 of the present invention, vibration generated in the lower metal plate from the start of ultrasonic vibration of the horn is detected and a vibration waveform signal is output. Based on the vibration detection means and the vibration waveform signal output from the vibration detection means, the amplitude of the vibration and the duration of the vibration are measured, the amplitude of the vibration is equal to or greater than a predetermined amplitude, and the continuation of the vibration If the time is equal to or longer than a predetermined time, it is determined that the joining of the two metal plates is completed, and vibration analysis determination means for outputting a vibration stop signal for stopping the ultrasonic vibration of the horn; Horn drive control means for stopping the ultrasonic vibration of the horn based on the vibration stop signal output from the vibration analysis determination means.

  In the ultrasonic metal bonding machine according to claim 1 of the present invention, when the amplitude of the vibration of the lower metal plate is not less than a predetermined amplitude and the vibration has continued for a predetermined time or more, two metal plates are used. Therefore, the ultrasonic vibration of the horn was stopped. For this reason, since the anvil and the lower metal plate are not rubbed unnecessarily, the bonded metal plate is not damaged such as the lower metal plate being thinned. Therefore, the ultrasonic metal bonding machine according to claim 1 can obtain a bonded metal plate with stable bonding strength.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a system diagram of an ultrasonic metal bonding machine 1 showing an embodiment of the present invention. The ultrasonic metal bonding machine 1 is used for bonding two metal plates 10 and 11. As an example of the metal plate, the lower metal plate 10 may be brass plated with tin, and the upper metal plate 11 may be copper plated with nickel.

  The ultrasonic metal bonding machine 1 includes an anvil 2, a horn 3, a vibration detection system, an ultrasonic metal bonding machine control unit 6, an ultrasonic vibrator and a pressurizing device (not shown). ing. The vibration detection system includes a laser Doppler vibrometer 4 and a vibration analysis determination device 5.

  The laser Doppler vibrometer 4 constitutes the vibration detecting means of the present invention, and includes a vibrometer sensor unit 41 and a vibrometer control unit 42.

  The vibrometer sensor unit 41 detects a vibration generated in the lower metal plate 10 and outputs a detection signal. Further, the vibrometer control unit 42 outputs a vibration waveform signal based on the detection signal output from the vibrometer sensor unit 41.

  The vibration analysis determination device 5 is connected to the laser Doppler vibrometer 4. The vibration analysis determination device 5 constitutes a vibration analysis determination means of the present invention, and includes a waveform monitor 51 and a vibration analysis determination unit 52.

  The waveform monitor 51 displays the vibration waveform signal output from the vibrometer control unit 42 of the laser Doppler vibrometer 4. The vibration analysis determination unit 52 measures the amplitude and duration of vibration based on the vibration waveform signal output from the vibration meter control unit 42, and outputs various control signals.

  The ultrasonic metal bonding machine control unit 6 is connected to the vibration analysis determination device 5 and the like. The ultrasonic metal bonding machine control unit 6 constitutes the horn drive control means of the present invention. The ultrasonic metal bonding machine controller 6 is configured to perform various controls such as drive control of the horn 3 based on a signal output from the vibration analysis determination device 5 or the like.

  Next, a method of joining the metal plates 10 and 11 in the ultrasonic metal joining machine 1 configured as described above will be described. An operator places the metal plate 10 on the anvil 2, puts another metal plate 11 thereon, and pushes a start switch (not shown) of the ultrasonic metal bonding machine 1. Then, the pressurization device of the ultrasonic metal bonding machine 1 presses the horn 3 downward, and the horn 3 and the anvil 2 sandwich the two metal plates 10 and 11.

  Next, the ultrasonic transducer of the ultrasonic metal bonding machine 1 is driven. As a result, as shown in FIG. 2, the horn 3 is ultrasonically vibrated in the horizontal direction, and ultrasonic vibration is applied from the horn 3 to the upper metal plate 11.

  Initially, the upper metal plate 11 vibrates together with the vibration of the horn 3, and the lower metal plate 10 does not vibrate, and the two metal plates 10 and 11 are slid right and left. Then, impurities such as an oxide film adhering to the contact surfaces of both metal plates 10 and 11 are removed, and frictional heat is generated in the overlapping portions 12 of both metal plates 10 and 11. Due to this frictional heat, an abrupt plastic flow occurs in the overlapped portion 12, and both the metal plates 10 and 11 begin to join.

  When both the metal plates 10 and 11 start to be joined, the lower metal plate 10 also starts to vibrate as shown in FIG. The duration of this vibration is as short as 2 to 10 mS, for example. When this vibration is completed, as shown in FIG. 2, only the upper metal plate 11 returns to a vibrating state.

  Both the metal plates 10 and 11 maintain the state of FIG. 3 after repeating the state of FIG. 2 and the state of FIG. 3 about 5-7 times, for example. That is, the vibration state of both the metal plates 10 and 11 is maintained. This means that the joining of both the metal plates 10 and 11 is completed.

  Therefore, the ultrasonic metal bonding machine 1 performs a control process for stopping the ultrasonic vibration of the horn 3. The control process will be described below using the flowchart of FIG. This control process is performed using vibration generated in the lower metal plate 10 when the metal plates 10 and 11 are joined.

  First, when the horn 3 starts ultrasonic vibration, the laser Doppler vibrometer 4 detects the vibration generated in the lower metal plate 10 by the vibrometer sensor unit 41, and generates a vibration waveform signal by the vibrometer control unit 42. It outputs to the vibration analysis judgment apparatus 5 (step S1).

  Based on the vibration waveform signal output from the laser Doppler vibrometer 4, the vibration analysis determination device 5 displays a vibration waveform as shown in FIG. Further, the vibration analysis determination unit 52 determines whether or not the amplitude of the vibration A generated in the lower metal plate 10 is equal to or greater than a predetermined amplitude W (see FIG. 5) based on the vibration waveform signal (step). S2). The magnitude of the predetermined amplitude W is determined in advance by conducting a joining experiment of the metal plates 10 and 11, and varies depending on the type of the metal plate and various conditions at the time of joining the metal plates.

  In addition, the vibration analysis determination device 5 measures the vibration duration time (vibration time) based on the vibration waveform signal output from the laser Doppler vibrometer 4. FIG. 6 is a diagram illustrating the duration of vibration. When the vibration analysis determination device 5 determines that the amplitude of the vibration A is greater than or equal to the predetermined amplitude W (YES in step S2), the vibration A continues for a predetermined time t or longer as shown in FIGS. It is determined whether or not there is (step S3). The predetermined time t is determined in advance by conducting a joining experiment of the metal plates 10 and 11 in the same manner as the predetermined value, and differs depending on the type of the metal plate and various conditions at the time of joining the metal plate.

  When the vibration A continues for a predetermined time t or longer (YES in step S3), the vibration analysis determination device 5 determines that the joining of the metal plates 10 and 11 is completed, and performs ultrasonic vibration of the horn 3. A vibration stop signal for stopping is output to the ultrasonic metal bonding machine controller 6.

  The ultrasonic metal bonding machine controller 6 stops the driving of the ultrasonic vibrator based on the vibration stop signal output from the vibration analysis determination device 5. As a result, the ultrasonic vibration of the horn 3 is stopped at time B shown in FIGS. As a result, a bonded metal plate 13 as shown in FIG. 3 is obtained.

  Thus, in the ultrasonic metal bonding machine 1 according to the present embodiment, the ultrasonic vibration of the horn 3 is stopped immediately after the bonding of the two metal plates 10 and 11 is completed. For this reason, even if the joining of the metal plates 10 and 11 is completed, the ultrasonic metal joining machine 1 according to the present embodiment has the anvil 2 and the lower metal plate 10 as in the conventional ultrasonic metal joining machine. There will be no rubbing.

  Therefore, the bonded metal plate 13 is not damaged such as the lower metal plate 10 becoming thin. Therefore, the ultrasonic metal bonding machine 1 according to the present embodiment can obtain the bonded metal plate 13 with stable bonding strength. Moreover, since this joining metal plate 13 can obtain the joining strength more stable than the conventional joining board | substrate, quality improves.

  As mentioned above, although embodiment concerning this invention was illustrated, this embodiment does not limit the content of this invention. Various modifications can be made without departing from the scope of the claims of the present invention. For example, in the present embodiment, the laser Doppler vibrometer 4 is used as the vibration detection means, but other various vibrometers, vibration sensors, and the like may be used.

As described above, in the ultrasonic metal bonding machine of the present invention, a bonded metal plate with stable bonding strength can be obtained . Therefore, the present invention can be sufficiently utilized in the art of ultrasonic metal joining machine.

1 is a system diagram of an ultrasonic metal joining machine showing an embodiment of the present invention. It is a schematic diagram which shows the state of the metal plate by ultrasonic vibration in the embodiment. It is a schematic diagram which shows another state of the metal plate by ultrasonic vibration in the same embodiment. It is a flowchart which shows the stop control process of an ultrasonic vibration in the embodiment. It is a figure which shows the waveform of a vibration of the lower metal plate in the embodiment. It is a figure which shows the continuation time of the vibration of a lower metal plate in the embodiment.

Explanation of symbols

1 Ultrasonic Metal Bonding Machine 2 Anvil 3 Horn 4 Laser Doppler Vibrometer 5 Vibration Analysis Judgment Device 6 Ultrasonic Metal Bonding Machine Control Unit 10 Lower Metal Plate 11 Upper Metal Plate 13 Bonded Metal Plate

Claims (1)

The two metal plates are placed on the anvil in a stacked state, and the two metal plates are sandwiched between the anvil and the horn. In this state, the horn is ultrasonically vibrated in the horizontal direction and the upper metal plate is sandwiched between the two metal plates. In an ultrasonic metal joining machine that obtains a joined metal plate by applying this ultrasonic vibration to the plate and sliding the two metal plates to the left and right to join them,
Vibration detecting means for detecting vibration generated in the lower metal plate from the start of ultrasonic vibration of the horn and outputting a vibration waveform signal;
Based on the vibration waveform signal output from the vibration detection means, the amplitude of the vibration and the duration of the vibration are measured, the amplitude of the vibration is not less than a predetermined amplitude, and the duration of the vibration is not less than a predetermined time. In this case, it is determined that the joining of the two metal plates has been completed, and vibration analysis determination means for outputting a vibration stop signal for stopping the ultrasonic vibration of the horn,
An ultrasonic metal joining machine comprising: a horn drive control means for stopping ultrasonic vibration of the horn based on the vibration stop signal output from the vibration analysis determination means.

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