JP2018083209A - Ultrasonic joining apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic joining apparatus capable of separating surely a joined body from a chip after being joined thereto, even if joining work is performed repeatedly.SOLUTION: In an ultrasonic joining apparatus 1, a horn 9 is lowered by a lifting machine 5, and both aluminum alloy plates W1 are pinched by an amble 3 and a chip 10, and the horn 9 is vibrated by a vibration unit 7, to thereby perform ultrasonic joining. A slide member 11 slidable in a vertical direction is provided inside the chip 10. A coil spring 12 is slid downward by pressing the slide member 11 downward, and its lower end part is allowed to jump out from a lower end part of the chip 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an ultrasonic bonding apparatus for bonding two overlapped objects to be bonded by ultrasonic vibration.

  Conventionally, a general ultrasonic bonding apparatus includes a horn having a bonding chip attached to the lower side, and two panel-like objects to be joined that are provided below the horn and made of metal. The horn is lowered, the both objects to be bonded are sandwiched between the amble and the chip, and the horn is vibrated in the horizontal direction to perform ultrasonic bonding.

  By the way, in the ultrasonic bonding apparatus as described above, when ultrasonic bonding is repeatedly performed, a phenomenon occurs in which a part of the object to be bonded is adhered to the chip surface in powder form. Then, when ultrasonic bonding is performed while a part of the bonded body is adhered to the chip surface in a powder state, the bonded body is fixed to the chip in the worst case, and the chip rises after bonding At the same time, the object to be joined fixed to the chip is pulled up, so that there is a problem that the joining operation cannot be continued.

  In order to avoid this, for example, in Patent Document 1, an air flow passage capable of circulating air inside the horn and the tip is formed. The air flow path is open to the lower surface of the chip. Even if the bonded object is fixed to the chip, the bonded object is inserted into the chip by the discharge force of the air discharged from the opening portion of the air flow path. It can be separated from.

JP 2008-142738 A

  However, in the ultrasonic bonding apparatus disclosed in Patent Document 1, when ultrasonic bonding is repeatedly performed, a part of the object to be bonded is gradually moved by the vibration operation of the chip to open the air flow path. There is a risk of entering the part. If it does so, an air flow path will become narrow or will be blocked, and if a to-be-joined body adheres to a chip, it will become impossible to separate a to-be-joined body from a chip.

  The present invention has been made in view of such a point, and an object of the present invention is to provide an ultrasonic bonding apparatus capable of reliably separating an object to be bonded from a chip after bonding even when the bonding operation is repeatedly performed. It is to provide.

  In order to achieve the above object, the present invention is characterized in that a slide member that can slide up and down is provided inside or outside the chip.

  Specifically, a horn having a bonding tip positioned on the lower side, a vibrating means for vibrating the horn in a horizontal direction, an elevating means for moving the horn up and down, and two ridges provided below the horn. An amble on which a joined body can be stacked, and the horn is lowered by the lifting means to sandwich the joined bodies between the amble and the chip, and the horn is vibrated by the vibrating means. The following solution was taken for an ultrasonic bonding apparatus configured to perform ultrasonic bonding.

  That is, in the first invention, a slide member that is provided inside or outside of the chip and is slidable in the vertical direction, and is slid downward by pressing the slide member, and its lower end portion is the lower end portion of the chip. And pressing means for jumping out from the head.

  According to a second invention, in the first invention, the chip is formed with an accommodation recess that opens on a lower surface and accommodates the slide member and the pressing means, and the lower end portion of the slide member is the slide. When the member slides downward, it is configured to jump out from the opening portion of the housing recess.

  According to a third aspect, in the second aspect, the pressing means is a coil spring that constantly urges the slide member downward.

  In the first invention, if the object to be joined is firmly fixed to the chip when the horn is raised after the ultrasonic joining operation is finished, the slide member that is pressed by the pressing means and slides downward. Since the lower end portion of the substrate is pressed downward by an amount that protrudes from the lower end portion of the chip, the object to be bonded can be separated from the chip. Further, since there is no need to provide an air flow path in the chip as in Patent Document 1, even if the ultrasonic bonding operation is repeated, a part of the joined body enters the air flow path and the air flow path becomes narrower. Alternatively, it can be avoided that the object to be bonded cannot be pressed downward due to clogging, and the object to be bonded can be reliably separated from the chip.

  In the second aspect of the invention, since the slide member and the pressing means are surrounded by the chip, it is possible to reduce the failure of the apparatus due to dust or dirt adhering to the slide member and the pressing means.

  In the third invention, when ultrasonic bonding is performed, both the bonded bodies are ultrasonically vibrated in a state where the portions corresponding to the slide members of the both bonded bodies are pressed against the slide member by the biasing force of the coil spring. Become. Therefore, even if a mechanism for separating the object to be bonded from the chip is provided inside the chip, it is possible to press both objects to be bonded evenly with the amble in the entire region of the chip that contacts the object to be bonded. And a good joint can be formed between the objects to be joined.

1 is a perspective view of an ultrasonic bonding apparatus according to an embodiment of the present invention. It is sectional drawing in the II-II line of FIG. FIG. 3 is a view taken in the direction of arrow III in FIG. It is a figure which shows the state just before performing ultrasonic joining after FIG. It is a figure which shows the state in the middle of performing ultrasonic joining after FIG. FIG. 6 is a diagram showing a state immediately after the ultrasonic bonding is finished after FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows an ultrasonic bonding apparatus 1 according to an embodiment of the present invention. The ultrasonic bonding apparatus 1 is an apparatus in which two stacked aluminum alloy plates W1 (to-be-bonded bodies) are integrated by ultrasonic bonding, and an apparatus main body 2 installed on a floor, and the apparatus main body 2 side. And an amble 3 that can be placed in a state where the two aluminum alloy plates W1 are overlapped with each other, and an anti-slip portion 3a having an uneven shape is formed on the upper surface of the amble 3 (see FIG. 2).

  The apparatus main body 2 includes a processing unit 4 extending in a horizontal direction toward a position above the amble 3 and an elevator 5 (elevating means) for moving the processing unit 4 up and down. The amble 3 includes the processing unit 4. 4 is located below the extended end side.

  The processing unit 4 includes an elongated substantially rectangular parallelepiped housing case 6 having a housing space 6a therein, and the housing space 6a accommodates a substantially cylindrical vibration unit 7 (vibration means) and a rotary motor 8. Has been.

  The vibration unit 7 has a posture in which the cylinder center line C <b> 1 is along the longitudinal direction of the processing unit 4, and one end side of the vibration unit 7 faces the outside of the housing case 6.

  The rotary motor 8 is disposed on the other end side of the vibration unit 7, and the rotation shaft 8 a is located on the cylinder center line C <b> 1 of the vibration unit and protrudes inward of the vibration unit 7. .

  On one end side of the vibration unit 7, a horn 9 whose center line C <b> 2 coincides with the cylinder center line C <b> 1 of the vibration unit 7 is provided.

  The horn 9 includes a horn main body 9a having an elongated round bar shape, and a square plate-shaped processing head 9b having a thickness attached to one end of the horn main body 9a. The vibration unit 7 is inserted inward.

  The other end of the horn body 9a is connected to the rotation shaft 8a of the rotary motor 8, and the horn 9 can be rotated around the center line C2 by the rotation operation of the rotation shaft 8a in the rotation motor 8. ing.

  The other end side of the horn body 9a is connected to a vibration mechanism (not shown) provided inward of the vibration unit 7, and the horn 9 is connected to the center line C2 by the vibration unit 7. It can vibrate in the orthogonal horizontal direction (arrow X1 direction in FIG. 5).

  The processing head 9b is provided with four joining chips 10 each having a rectangular plate shape at equal intervals around the center line C2. When the horn 9 is rotated by the rotary motor 8, the bonding head 10 is formed below the horn 9. The positioned chips 10 are switched in order.

  As shown in FIGS. 2 to 6, a pair of concave and convex surface portions 10a are formed on the lower surface of the chip 10 so as to be spaced apart on both sides in the vibration direction.

  An accommodation recess 10b that opens to the lower surface of the chip 10 is formed in the central portion of the chip 10, and the opening of the accommodation recess 10b is located between the two uneven surface portions 10a.

  An annular projecting portion 10c is formed on the opening-side inner peripheral surface of the housing recess 10b so as to be smaller in diameter than the inner peripheral surface of the rear end side of the housing recess 10b. It is substantially T-shaped in view.

  The housing recess 10b accommodates a slide member 11 whose center axis is directed in the vertical direction so as to be slidable in the vertical direction.

  The slide member 11 is formed to be continuous with the disc-shaped head portion 11a located on the back end side of the housing recess 10b and the head portion 11a, and inside the annular projecting portion 10c of the housing recess 10b. It consists of the shaft part 11b located in this.

  When the slide member 11 slides downward, the head portion 11a comes into contact with the annular projecting portion 10c so as not to slide further downward. The head portion 11a is brought into contact with the annular projecting portion 10c. The lower end portion of the shaft portion 11b protrudes downward from the lower end portion of the chip 10 in a contact state.

  A coil spring 12 (pressing means) that constantly urges the slide member 11 downward is housed on the back end side of the housing recess 10b, and the coil spring 12 presses the slide member 11 downward to move the slide member 11 downward. 11 is protruded from the lower end portion of the chip 10.

  As shown in FIGS. 2 to 6, the ultrasonic bonding apparatus 1 lowers the horn 9 by the elevator 5 and puts the two aluminum alloy plates W1 superimposed on the amble 3 into the amble 3 and the chip 10. In addition, the horn 9 is vibrated by the vibration unit 7 to perform ultrasonic bonding, and a solid-phase bonding portion J1 is formed between the two aluminum alloy plates W1. Yes.

  Next, an ultrasonic bonding operation using the ultrasonic bonding apparatus 1 according to the embodiment of the present invention will be described in detail.

  First, as shown in FIG. 2, an industrial robot (not shown) places the two aluminum alloy plates W <b> 1 before joining on the amble 3.

  When the placement work of the aluminum alloy plates W1 on the amble 3 by the industrial robot is completed, the ultrasonic bonding apparatus 1 is activated. Then, the horn 9 starts to descend by the elevator 5.

  Thereafter, the lower end portion of the slide member 11 that protrudes downward from the lower end portion of the chip 10 comes into contact with the upper surfaces of the two aluminum alloy plates W1 placed on the amble 3, and the slide member 11 resists the biasing force of the coil spring 12. And begin to slide upwards. Then, as shown in FIG. 4, both the concavo-convex surface portions 10 a of the chip 10 come into contact with the upper surfaces of the two aluminum alloy plates W <b> 1 placed on the amble 3, and the both aluminum alloy plates W <b> 1 are between the amble 3. And pressurize.

  Thereafter, the horn 9 starts to vibrate by the vibration unit 7. Then, as shown in FIG. 5, both the rugged surface portions 10a bite into the upper aluminum alloy plate W1 and the anti-slip portion 3a bites into the lower aluminum alloy plate W1. A solid-phase joint J1 is formed between the aluminum alloy plates W1 so that both the aluminum alloy plates W1 are integrated. At this time, the slide member 11 presses both the aluminum alloy plates W1 downward by the urging force of the coil spring 12, thereby sandwiching and pressing the both aluminum alloy plates W1 with the amble 3.

  When the ultrasonic bonding of both the aluminum alloy plates W1 is completed, the horn 9 is raised by the elevator 5. At this time, as shown in FIG. 6, the lower end portion of the slide member 11 that slides downward by the biasing force of the coil spring 12 jumps out from the lower end portion of the chip 10, so that the slide member 11 presses both the aluminum alloy plates W <b> 1 downward. Then, it is separated from the chip 10.

  Thereafter, the horn 9 raised by the elevator 5 stops when it rises by a predetermined distance.

  Thereafter, the horn 9 is rotated around the center line C2 by the rotation operation of the rotating shaft 8a in the rotary motor 8, and the chip 10 positioned below the horn 9 is switched to the chip 10 adjacent to the center line C2.

  After the joined aluminum alloy plates W1 placed on the amble 3 are taken out by the industrial robot, the two aluminum alloy plates W1 before joining are placed on the amble 3 by the industrial robot and again super It will be in the state which can perform sonic bonding.

  As described above, according to the embodiment of the present invention, even if both aluminum alloy plates W1 are fixed to the chip 10 when the horn 9 is lifted after the ultrasonic bonding operation is finished, the coil spring 12 Since both aluminum alloy plates W1 are pressed downward by the amount that the lower end portion of the slide member 11 that is pressed and slides downward protrudes from the lower end portion of the chip 10, both the aluminum alloy plates W1 can be separated from the chip 10. .

  Further, since it is not necessary to provide the air flow passage in the chip 10 as in Patent Document 1, even if the ultrasonic bonding operation is repeated, the aluminum flow generated from the aluminum alloy plate W1 enters the air flow passage, so that the air flow passage. It is possible to prevent the aluminum alloy plate W1 from being narrowed or blocked and becoming unable to press the aluminum alloy plate W1 downward, and the both aluminum alloy plates W1 can be reliably separated from the chip 10.

  Further, since the slide member 11 and the coil spring 12 are housed in the housing recess 10 b of the chip 10 and are surrounded by the chip 10, the slide member 11 and the coil spring 12 are superfluous when dust, dust or the like adheres to the slide member 11 and the coil spring 12. The failure of the sonic bonding apparatus 1 can be reduced.

  Further, when performing ultrasonic bonding, both the aluminum alloy plates W1 are ultrasonically vibrated in a state where the portions corresponding to the slide members 11 of the both aluminum alloy plates W1 are pressed against the slide member 11 by the biasing force of the coil spring 12. become. Therefore, even if a mechanism for separating both the aluminum alloy plates W1 from the chip 10 is provided inside the chip 10, the both aluminum alloy plates W1 are connected to the amble 3 in the entire region in contact with both the aluminum alloy plates W1 of the chip 10. Between the two aluminum alloy plates W1 can be formed, and a good solid phase joint J1 can be formed.

  In the embodiment of the present invention, the accommodation recess 10b is formed at the center of the chip 10, but the present invention is not limited thereto, and may be provided on both sides in the vibration direction, for example.

  Further, in the embodiment of the present invention, the slide member 11 is positioned inside the chip 10, but may be provided along the outer peripheral surface of the chip 10.

  Further, in the embodiment of the present invention, the slide member 11 is slid downward by the coil spring 12, but may be pressed downward by a cylinder or the like, for example.

  In the embodiment of the present invention, four chips 10 are provided at equal intervals around the center line C2 in the horn 9, but two or three chips 10 are equally spaced around the center line C2 in the horn 9. It may be possible to provide five or more.

  In the ultrasonic bonding apparatus 1 of the present invention, both aluminum alloy plates W1 are bonded by ultrasonic bonding, but other materials can also be bonded by ultrasonic bonding.

  INDUSTRIAL APPLICABILITY The present invention is suitable for an ultrasonic bonding apparatus that bonds two superimposed objects to be bonded by ultrasonic vibration.

DESCRIPTION OF SYMBOLS 1 Ultrasonic bonding apparatus 3 Amble 5 Elevator (elevating means)
7 Vibration unit (vibration means)
9 Horn 10 Chip 10b Receiving recess 11 Slide member 12 Coil spring (pressing means)
W1 Aluminum alloy plate (to-be-joined)

Claims (3)

A horn with a chip for bonding located on the lower side;
Vibration means for vibrating the horn in a horizontal direction;
Elevating means for elevating the horn;
An amble provided below the horn and capable of placing two objects to be joined together,
An ultrasonic bonding apparatus configured to lower the horn by the elevating means and sandwich the both objects to be bonded between the amble and the chip, and to perform ultrasonic bonding by vibrating the horn by the vibrating means. There,
A slide member provided inside or outside the chip and slidable in the vertical direction;
An ultrasonic bonding apparatus comprising: a pressing unit that slides downward by pressing the slide member and causes a lower end portion of the slide member to protrude from the lower end portion of the chip. The ultrasonic bonding apparatus according to claim 1,
The chip is formed with a housing recess that opens on the lower surface and houses the slide member and the pressing means.
The ultrasonic bonding apparatus according to claim 1, wherein the lower end portion of the slide member is configured to protrude from the opening portion of the receiving recess when the slide member slides downward. The ultrasonic bonding apparatus according to claim 2,
The ultrasonic bonding apparatus according to claim 1, wherein the pressing means is a coil spring that constantly biases the slide member downward.

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