JP7492391B2 - Ultrasonic bonding device, tip member of ultrasonic bonding device, and method for attaching tip member - Google Patents

Description

The present invention relates to an ultrasonic bonding device, a tip member of the ultrasonic bonding device, and a method for attaching the tip member, and more specifically, to an ultrasonic bonding device in which the tip member is removably attached to an ultrasonic horn, a tip member of the ultrasonic bonding device, and a method for attaching the tip member.

An ultrasonic bonding device that allows a tip member to be detachably attached to an ultrasonic horn is known, as disclosed in Patent Document 1.

The "ultrasonic bonding tool and ultrasonic bonding tool attachment method" disclosed in Patent Document 1 discloses an ultrasonic bonding tool (tip member) that can be easily attached to and replaced on a horn and a method for attaching the ultrasonic bonding tool (tip member), and can perform ultrasonic bonding even when the distance from the resonator to the bonding point is long due to obstacles or the like, and the length of the tool (tip member) must be increased, or when a large bonding load is required. Specifically, the ultrasonic bonding tool (tip member) 6 ultrasonically bonds the first and second copper plates 11, 12 by applying pressure to the second copper plate 12 with its tip surface 6d and applying ultrasonic vibrations. The ultrasonic bonding tool (tip member) 6 is composed of a cylindrical base portion 6a whose base end is attached to the horn 5, and a cylindrical tip portion 6b that extends downward from the base portion 6a and has a smaller diameter than the base portion 6a. The ultrasonic bonding tool (tip member) 6 is attached to the horn 5 detachably by fixing the base portion 6a to the horn 5 with a bolt 7.

However, in the ultrasonic welding tool (tip member) 6 disclosed in the above Patent Document 1, the base portion 6a, which has a larger diameter than the cylindrical tip portion 6b, is simply attached to the horn 5 with a bolt 7. This makes the connection between the horn 5 and the ultrasonic welding tool (tip member) 6 unstable, and there is a problem that stable ultrasonic welding cannot be performed when the length of the tool (tip member) is increased or a large welding load is required.

Patent No. 4874445

The present invention aims to provide an ultrasonic bonding device, a tip member, and a method for attaching the tip member, in which the tip member of the ultrasonic bonding device is configured to be detachably attached to the ultrasonic horn, and which enables stable ultrasonic bonding.

In order to achieve the above object, the present invention provides an ultrasonic bonding device that applies a load to a portion of a workpiece placed on an anvil via a tip member attached to an ultrasonic horn, and applies ultrasonic vibrations from the ultrasonic horn to the portion to be bonded via the tip member, thereby bonding the portion to be bonded, wherein the tip member has a truncated cone-shaped tapered portion at a base portion attached to the ultrasonic horn, the diameter of which gradually decreases toward the ultrasonic horn, and a guide member extending from the tapered portion and having a screw groove formed on an inner wall. the tip member is fixed to the ultrasonic horn by inserting the tapered portion and the guide portion into a tip member mounting hole formed on one side of the ultrasonic horn and tightening a screw member that fits into the screw groove from the other side of the ultrasonic horn , the tip member mounting hole being formed on one side of the ultrasonic horn and having a first hole portion into which the tapered portion fits, and a second hole portion having a hole shape that extends linearly from the first hole portion toward the other side of the ultrasonic horn without increasing or decreasing in inner diameter, and into which the guide portion fits .

The invention of claim 2 is the invention of claim 1, characterized in that the screw groove is formed to extend from the guide portion to the inside of the tapered portion.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2 , the tip member mounting hole has a third hole portion formed on the other surface of the ultrasonic horn, into which the screw member is inserted, and on whose side an engagement portion is formed with which the lower end of the peripheral portion of the head of the screw member engages.

The invention of claim 4 is the invention of any one of claims 1 to 3, characterized in that the tip member has a tapered tip portion formed so that the cross-sectional area of the tip is smaller than the cross-sectional area of the base portion.

The invention of claim 5 is a tip member of an ultrasonic joining device that is attached to an ultrasonic horn, comes into contact with workpieces including parts to be joined that are placed on an anvil, applies a load to the parts to be joined and applies ultrasonic vibrations from the ultrasonic horn to join the parts to be joined, and has a base portion attached to the ultrasonic horn, a truncated cone-shaped tapered portion whose diameter gradually decreases toward the ultrasonic horn side, and a guide portion extending from the tapered portion and having a screw groove formed on its inner wall, and is fixed to the ultrasonic horn by inserting the tapered portion and guide portion into a tip member mounting hole formed in one surface of the ultrasonic horn and tightening a screw member that fits into the screw groove from the other surface of the ultrasonic horn, and the tip member mounting hole is formed in one surface of the ultrasonic horn, and has a first hole portion into which the tapered portion fits, and a second hole portion that has a hole shape that extends linearly from the first hole portion toward the other surface of the ultrasonic horn without increasing or decreasing in inner diameter, and into which the guide portion fits .

The invention of claim 6 is characterized in that the invention of claim 5 has a tapered tip portion formed so that the cross-sectional area of the tip is smaller than the cross-sectional area of the base portion.

The invention of claim 7 is a method for attaching a tip member of an ultrasonic joining device that is attached to an ultrasonic horn, abuts against workpieces including parts to be joined that are placed on an anvil, applies a load to the parts to be joined, and applies ultrasonic vibrations from the ultrasonic horn to join the parts to be joined, wherein the tip member has a truncated conical tapered portion at a base portion attached to the ultrasonic horn that gradually decreases in diameter toward the ultrasonic horn, and a guide portion extending from the tapered portion and having a screw groove formed on an inner wall thereof, the tapered portion and the guide portion are inserted into a tip member attachment hole formed in one surface of the ultrasonic horn, and the tip member is fixed to the ultrasonic horn by tightening a screw member that fits into the screw groove from the other surface of the ultrasonic horn, the tip member attachment hole having a first hole portion formed in one surface of the ultrasonic horn and a second hole portion having a hole shape that extends linearly from the first hole portion toward the other surface of the ultrasonic horn without increasing or decreasing in inner diameter, and into which the guide portion fits .

The invention of claim 8 is characterized in that in the invention of claim 7, the screw groove is formed to extend from the guide portion to the inside of the tapered portion.

The invention of claim 9 is characterized in that, in the invention of claim 7 or 8, the tip member mounting hole has a third hole portion formed on the other surface of the ultrasonic horn, into which the screw member is inserted, and on whose side an engagement portion is formed with which the lower end of the peripheral portion of the head of the screw member engages.

According to the present invention, an ultrasonic bonding device applies a load to a portion of a workpiece placed on an anvil to be bonded through a tip member attached to an ultrasonic horn, and applies ultrasonic vibrations from the ultrasonic horn to the portion to be bonded through the tip member, thereby bonding the portion to be bonded. The tip member has a truncated cone-shaped tapered portion at the base portion attached to the ultrasonic horn, the diameter of which gradually decreases toward the ultrasonic horn, and a guide portion extending from the tapered portion and having a screw groove formed on the inner wall. The tapered portion and guide portion are inserted into a tip member mounting hole formed on one side of the ultrasonic horn, and the tip member is fixed to the ultrasonic horn by tightening a screw member that fits into the screw groove from the other side of the ultrasonic horn. This allows the tip member of the ultrasonic bonding device to be detachably attached to the ultrasonic horn, and the binding force between the ultrasonic horn and the tip member can be increased, thereby effectively oscillating the tip of the tip member to achieve stable ultrasonic bonding.

FIG. 1 is a side view showing an outline of an ultrasonic bonding apparatus according to an embodiment of the present invention. FIG. 2 is a front view of the ultrasonic bonding apparatus shown in FIG. FIG. 3 is a diagram showing an example of a tip member used in the ultrasonic bonding apparatus shown in FIG. FIG. 4 is a diagram for explaining an example of a mounting structure for mounting the tip member shown in FIG. 3 to an ultrasonic horn. FIG. 5 is a partial cross-sectional view showing the tip member shown in FIG. 3 attached to an ultrasonic horn.

The following describes in detail an embodiment of the present invention with reference to the attached drawings.

Figure 1 is a side view showing an outline of one embodiment of an ultrasonic bonding device according to the present invention, and Figure 2 is a front view of the ultrasonic bonding device shown in Figure 1.

In Figs. 1 and 2, the ultrasonic bonding device 100 of the first embodiment of the present invention places a workpiece 30 including a portion to be bonded 33 on an anvil 20 fixed to a base 10, applies a load from a pressure device 70 to the portion to be bonded 33 of the workpiece 30, and applies ultrasonic vibrations from a tip member 410 attached to the tip of an ultrasonic horn (hereinafter simply referred to as the horn) 40, thereby bonding the workpieces 31 and 32 at the portion to be bonded 33 of the workpiece 30, i.e., the surface where the workpieces 31 and 32 come into contact.

The horn 40 is connected to an ultrasonic vibrator (hereinafter simply referred to as the vibrator) 60 via a cone 50, and the ultrasonic vibration of the vibrator 60 is controlled by an ultrasonic generator (not shown). Here, the ultrasonic vibration applied from the tip of the horn 40 to the part to be joined 33 of the workpiece 30 is a vibration in the lateral direction X parallel to the part to be joined 33. Ultrasonic joining using ultrasonic vibration in the lateral direction X is suitable for, for example, joining metals together, welding and joining plastics, and in particular, welding and joining thin plastic sheets and films.

The part including the horn 40, cone 50, and vibrator 60 is held by an ultrasonic vibrator holder (hereinafter simply referred to as the vibrator holder) 61 attached to the cone 50, and pressure is applied from the pressure device 70 to the workpiece 30 via this vibrator holder 61.

Here, the transducer holder 61 is attached to the cone 50 at a portion where the amplitude due to the natural vibration of the transducer 60 is minimum.

Figure 3 shows a side view (Figure 3(A)) and a front view (Figure 3(B)) of an example of a tip member used in the ultrasonic bonding device shown in Figure 1.

As shown in FIG. 3(A), the tip member 410 used in this embodiment has a tip portion 411 extending from the horn 40 side, a truncated cone-shaped tapered portion 412 at the base of the tip portion 411 that is attached to the horn 40 and has a diameter that gradually decreases toward the horn 40 side, and a guide portion 413 that extends from the tapered portion 412 and has a screw groove 414 formed on the inner wall.

Here, the screw groove 414 formed on the inner wall of the guide portion 413 is formed extending from the guide portion 413 to the inside of the tapered portion 412. The tip portion 411 has a tapered tip portion 415 formed so that the cross-sectional area of the tip is smaller than the cross-sectional area of the base portion. Here, the shape of the tip of the tip portion 415 of the tip portion 411 is formed linearly by forming tapered surfaces in only two directions in order to correspond to the linear welding target portion 33, but it may be formed circularly by forming tapered surfaces in all directions in order to correspond to the circular welding target portion.

In addition, the length L1 of the tapered tip 415 of the tip portion 411 is set to about 1/5 of the total length L of the tip portion 411 in the tip member 410 shown in FIG. 3, but the total length L of the tip portion 411 and the length L1 of the tapered tip portion 415 can be set arbitrarily. However, in this ultrasonic bonding device 100, the ultrasonic vibration at the tip of the tip portion 415 of the tip member 410 changes depending on the total length L of the tip portion 411 and the length L1 of the tapered tip portion 415, so it is preferable to set the total length L of the tip portion 411 and the length L1 of the tapered tip portion 415 appropriately depending on the shape, material, etc. of the workpiece 30 to be bonded.

Figure 4 is a diagram illustrating an example of a mounting structure for attaching the tip member shown in Figure 3 to an ultrasonic horn.

In FIG. 4, the tip of the horn 40, which is used to attach the tip member 410 shown in FIG. 3 to the horn 40, is provided with a tip member attachment hole 430 having a first hole 431 into which the tapered portion 412 of the tip member 410 formed on the underside of the horn 40 fits, a second hole 342 into which the guide portion 413 of the tip member 410 following the first hole 431 fits, and a third hole 433 into which the screw member 420 formed on the upper surface of the horn 40 is inserted and on its side is formed an engagement portion into which the lower end of the peripheral portion of the head 422 of the screw member 420 engages.

When attaching the tip member 410 shown in FIG. 3 to the horn 40, the tapered portion 412 and the guide portion 413 of the tip member 410 are inserted into the first hole portion 431 and the second hole portion 342 of the tip member attachment hole 430 from the lower side of the horn 40, and the screw member 420 is inserted into the third hole portion 433 of the tip member attachment hole 430 from the upper side of the horn 40, and the screw member 420 is tightened from the upper side of the horn 40.

The screw member 420 has a screw portion 421 and a head portion 422, and when the screw member 420 is tightened, the lower end of the peripheral portion of the head portion 422 of the screw member 420 engages with the engaging portion on the inner surface of the third hole portion 433 of the tip member attachment hole 430. With the above configuration, the tip member 410 is firmly attached to the tip of the horn 40 as shown in FIG. 5.

In other words, when the screw member 420 is tightened, the outer surface of the tapered portion 412 of the tip member 410 comes into contact with the inner surface of the first hole portion 431 of the tip member mounting hole 430, and at this time, the guide portion 413 is fitted into the second hole portion 432 of the tip member mounting hole 430, so that the tip member 410 can be stably attached to the tip of the horn 40.

If we consider a configuration in which the guide portion 413 is not provided in the tip member mounting hole 430, the tip member 410 may be attached at an angle to the horn 40 due to tightening of the screw member 420, and in such a configuration, the tip member 410 cannot be stably attached to the tip of the horn 40.

In addition, with the above configuration, the tip member 410 is attached to the tip of the horn 40 by tightening the screw member 420, making it easy to replace the tip member 410 depending on the shape, material, etc. of the workpiece, and enabling ultrasonic bonding under optimal conditions.

The above is an explanation of one embodiment of the present invention, but the present invention is not limited to the above embodiment, and many modifications are possible using the ordinary creative abilities of those skilled in the art as long as they are within the scope of the technical concept of the present invention. For example, the present invention can be applied not only to ultrasonic joining devices, but also to ultrasonic processing machines for fusing and cutting.

REFERENCE SIGNS LIST 10: Pedestal 20: Anvil 30: Work 40: Horn 50: Cone 60: Transducer 61: Transducer holder 70: Pressure device 100: Ultrasonic bonding device 410: Tip member 411: Tip portion 412: Tapered portion 413: Guide portion 414: Screw groove 415: Tip portion 420: Screw member 421: Screw portion 422: Head portion 430: Tip member attachment hole 431: First hole portion 432: Second hole portion 433: Third hole portion

Claims (9)

An ultrasonic bonding apparatus that applies a load to a portion to be joined of a workpiece placed on an anvil via a tip member attached to an ultrasonic horn and applies ultrasonic vibrations from the ultrasonic horn to the portion to be joined via the tip member, thereby bonding the portion to be joined,
the tip member has a truncated cone-shaped tapered portion at a base portion attached to the ultrasonic horn, the diameter of which gradually decreases toward the ultrasonic horn side, and a guide portion extending from the tapered portion and having a screw groove formed on an inner wall;
the tapered portion and the guide portion are inserted into a tip member attachment hole formed on one surface of the ultrasonic horn, and a screw member that fits into the screw groove from the other surface of the ultrasonic horn is tightened to fix the tip member to the ultrasonic horn ;
The tip member mounting hole is formed on one surface of the ultrasonic horn, and has a first hole portion into which the tapered portion fits, and a second hole portion having a hole shape that extends linearly from the first hole portion toward the other surface side of the ultrasonic horn without increasing or decreasing an inner diameter, and into which the guide portion fits.
1. An ultrasonic bonding apparatus comprising: The screw groove is
The ultrasonic bonding device according to claim 1 , wherein the guide portion is formed to extend into the tapered portion. 3. The ultrasonic joining device according to claim 1 , wherein the tip member mounting hole has a third hole portion formed on the other surface of the ultrasonic horn, into which the screw member is inserted, and which has an engagement portion formed on its side with which a lower end of a peripheral portion of a head of the screw member engages. The tip member is
4. The ultrasonic bonding device according to claim 1, further comprising a tapered tip portion formed so that a cross-sectional area of the tip portion is smaller than a cross-sectional area of the base portion. A tip member of an ultrasonic bonding device that is attached to an ultrasonic horn, comes into contact with a workpiece including a portion to be bonded that is placed on an anvil, applies a load to the portion to be bonded, and applies ultrasonic vibrations from the ultrasonic horn to bond the portion to be bonded,
A base portion attached to the ultrasonic horn has a tapered portion having a truncated cone shape whose diameter gradually decreases toward the ultrasonic horn, and a guide portion is provided extending from the tapered portion and has a screw groove formed on an inner wall thereof,
The tapered portion and the guide portion are inserted into a tip member mounting hole formed on one surface of the ultrasonic horn, and a screw member that fits into the screw groove from the other surface of the ultrasonic horn is tightened to fix the ultrasonic horn to the ultrasonic horn ,
The tip member mounting hole is formed on one surface of the ultrasonic horn, and has a first hole portion into which the tapered portion fits, and a second hole portion having a hole shape that extends linearly from the first hole portion toward the other surface side of the ultrasonic horn without increasing or decreasing an inner diameter, and into which the guide portion fits.
4. A tip member of an ultrasonic bonding apparatus comprising: 6. The tip member of the ultrasonic bonding device according to claim 5, further comprising a tapered tip portion formed so that a cross-sectional area of the tip portion is smaller than a cross-sectional area of the base portion. 1. A method for attaching a tip member to an ultrasonic bonding device which is attached to an ultrasonic horn, comes into contact with a workpiece including a portion to be bonded placed on an anvil, applies a load to the portion to be bonded, and applies ultrasonic vibrations from the ultrasonic horn to bond the portion to be bonded, comprising:
the tip member has a truncated cone-shaped tapered portion at a base portion attached to the ultrasonic horn, the diameter of which gradually decreases toward the ultrasonic horn side, and a guide portion extending from the tapered portion and having a screw groove formed on an inner wall;
The tapered portion and the guide portion are inserted into a tip member mounting hole formed on one surface of the ultrasonic horn,
a screw member that fits into the screw groove from the other surface of the ultrasonic horn is tightened to fix the tip member to the ultrasonic horn ;
The tip member mounting hole is formed on one surface of the ultrasonic horn, and has a first hole portion into which the tapered portion fits, and a second hole portion having a hole shape that extends linearly from the first hole portion toward the other surface side of the ultrasonic horn without increasing or decreasing an inner diameter, and into which the guide portion fits.
4. A method for attaching a tip member of an ultrasonic bonding apparatus comprising the steps of: The screw groove is
8. The method for attaching a tip member of an ultrasonic bonding apparatus according to claim 7, wherein the tip member is formed to extend from the guide portion to an inside of the tapered portion. 9. The method for attaching a tip member of an ultrasonic bonding apparatus according to claim 7 or 8, characterized in that the tip member attachment hole has a third hole portion formed in the other surface of the ultrasonic horn, into which the screw member is inserted, and which has an engagement portion formed on its side surface with which a lower end of a peripheral portion of a head of the screw member engages.

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