JP2017024040A - Ultrasonic bonding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic bonding apparatus capable of making effective use of heat, thus heightening the strength of the bonding.SOLUTION: An ultrasonic bonding apparatus 1 includes: an anvil 32 on which a portion SR where multiple metal materials 40 are overlapped with each other is placed; a horn 31 that is provided across the portion SR from the anvil 32, and which applies ultrasonic vibrations to the portion SR; and a jig 50 for sandwiching and pressing the multiple metal materials 40, thereby locating the portion SR between the horn 31 and the anvil 32. The horn 31 comprises: a tip portion 31a to be in contact with a first metal material 41 of the multiple metal materials 40; and a horn body portion 31b for holding the tip portion 31a. The tip portion 31a of the horn 31, a tip portion 32a of the anvil 32, and the whole of the jig 50 are formed of materials having thermal conductivity lower than that of the horn body portion 31b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an ultrasonic bonding apparatus.

  2. Description of the Related Art Conventionally, there has been known an ultrasonic bonding apparatus in which a plurality of metal members are sandwiched between a horn and an anvil and metal members are bonded to each other by applying ultrasonic vibration. In such an ultrasonic bonding apparatus, heat is generated in a plurality of metal members by ultrasonic vibration. The generated heat greatly contributes to bonding between the plurality of metal members, and has an effect of increasing the bonding strength.

  Therefore, an ultrasonic bonding apparatus has been proposed in which a heat insulating member is provided between the tip of the horn and the horn main body, and a heating means is provided on the horn tip side of the heat insulating member (see Patent Document 1). An ultrasonic bonding apparatus in which a heating means is provided on a horn or an anvil has also been proposed (see Patent Document 2).

JP 2006-339198 A JP 2012-204718 A

  However, the ultrasonic bonding apparatuses described in Patent Documents 1 and 2 cannot effectively use the heat acting on the bonding, and there is still room for improvement.

  The present invention has been made to solve such conventional problems, and an object of the present invention is to provide ultrasonic waves capable of increasing the strength of bonding by effectively using heat. It is to provide a joining apparatus.

  An ultrasonic bonding apparatus according to the present invention is an ultrasonic bonding apparatus that bonds a plurality of metal members by superimposing a plurality of metal members to be bonded and applying ultrasonic vibration to the overlapped portion. An anvil on which a portion where the metal members are superimposed is placed, a horn that is provided on the opposite side of the anvil across the portion, and that applies ultrasonic vibration to the portion, and the plurality of metal members are sandwiched A jig for positioning the portion between the horn and the anvil by pressing the horn, and the horn has a tip portion in contact with any one of the plurality of metal members; and the tip portion A portion of the horn that is in contact with any one of the plurality of metal members of the anvil and the jig. Wherein the thermal conductivity is formed at a lower member than parts.

  According to this ultrasonic bonding apparatus, the tip of the horn, and the portion of the anvil and jig that are in contact with any of the plurality of metal members are formed of a member having a lower thermal conductivity than the horn main body. Therefore, the heat generated in the plurality of metal members due to the ultrasonic vibration becomes difficult to escape to the horn, the anvil, and the jig, and the generated heat can be contained. Thereby, the strength of the bonding can be increased by effectively using heat.

  Further, the ultrasonic bonding apparatus of the present invention is an ultrasonic bonding apparatus that overlaps a plurality of metal members to be bonded, and bonds the plurality of metal members by applying ultrasonic vibration to the overlapped portion, An anvil on which a portion where the plurality of metal members are superimposed is placed; a horn that is provided on the opposite side of the anvil across the portion; and that applies ultrasonic vibration to the portion; and a plurality of the metal members A first jig for sandwiching and pressing a part of the metal members, and a second jig for sandwiching and pressing the remaining metal members excluding the part of the metal members among the plurality of metal members. Energizing at least one of the jig for positioning the portion between the horn and the anvil by pressing the jig and the second jig, and the first jig and the second jig. In Characterized in that it comprises a heating means for heating one even without.

  According to this ultrasonic bonding apparatus, since the heating means that heats at least one of the first jig and the second jig by energizing at least one of the first jig and the second jig is provided, the metal member other than the horn and the anvil is pressed. The tool is heated, and not only heat dissipation through the jig is suppressed, but a plurality of metal members are heated through the jig. Therefore, it is possible to increase the strength of bonding by effectively using heat.

  Since the jig holds a plurality of metal members, there is no need to provide a heating means for a member that vibrates like a horn or a member that easily receives vibration from the horn such as an anvil. Therefore, it is difficult to remove the electrode and the like, and it is possible to reduce the possibility that the current cannot be supplied due to the removal of the electrode.

  Further, in the ultrasonic bonding apparatus, the heating means includes a first jig and a second jig so that a current flows through the first jig, the plurality of metal members, and the second jig. It is preferable to energize both.

  According to this ultrasonic bonding apparatus, since the heating means energizes the first jig, the plurality of metal members, and the second jig so that current flows, the plurality of metal members themselves are also heated by energization. Thus, it is possible to further increase the bonding strength.

  In the ultrasonic bonding apparatus, the first jig includes two members for sandwiching the part of the metal member, and the second jig includes two members for sandwiching the remaining metal member. And one of the two members of the first jig and the second jig is energized by the heating means, and the two members of the first jig and the second jig In the other member, it is preferable that at least a portion in contact with the metal member is formed of an insulating member.

  According to this ultrasonic bonding apparatus, one of the two members of the first jig and the second jig is energized by the heating means, and at least the portion where the other member is in contact with the metal member is an insulating member. It is constituted by. For this reason, it can prevent that the electric current which flowed through one member among jigs flows into the other member as it is, and can heat a plurality of metal members themselves suitably.

  ADVANTAGE OF THE INVENTION According to this invention, the ultrasonic bonding apparatus which can aim at the high intensity | strength of joining using heat effectively can be provided.

It is the schematic which shows an example of the ultrasonic welding apparatus which concerns on embodiment of this invention. It is a front view of the ultrasonic bonding apparatus shown in FIG. It is a graph which shows the joint strength of the 1st and 2nd metal member in this embodiment and a comparative example. It is a front view of the ultrasonic bonding apparatus concerning a 2nd embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an example of an ultrasonic welding apparatus according to an embodiment of the present invention. The ultrasonic bonding apparatus 1 shown in FIG. 1 joins a plurality of metal members 40 by superposing a plurality of metal members 40 to be joined, and applying ultrasonic vibration to the superposed region SR, The power supply 10, the vibrator 20, and the ultrasonic bonding portion 30 are roughly configured. In addition, as the metal member 40, the conductor part of an electric wire, a metal terminal, a metal plate, etc. are mentioned.

  The power source 10 is an AC power source for performing ultrasonic bonding in the ultrasonic bonding unit 30. The vibrator 20 is vibrated by an alternating current from the power source 10. The ultrasonic bonding part 30 has a horn 31 and an anvil 32. In the anvil 32, a portion SR in which a plurality of metal members 40 are overlapped is placed. The horn 31 is provided on the opposite side of the anvil 32 across the overlapped portion SR, and applies ultrasonic vibration to the portion SR in a state where the horn 31 is pressed against the portion SR with a predetermined load F. . As described above, the ultrasonic bonding part 30 sandwiches a plurality of metal members 40 between the horn 31 and the anvil 32, and the horn 31 is vibrated by the vibrator 20, thereby propagating ultrasonic vibration energy, and overlapping portions. SR bonding is performed.

  FIG. 2 is a front view of the ultrasonic bonding apparatus 1 shown in FIG. As shown in FIG. 2, the ultrasonic bonding apparatus 1 further includes a jig 50 that sandwiches and holds a plurality of metal members 40. By pressing the plurality of metal members 40 with the jig 50, the overlapped region SR is fixedly positioned between the horn 31 and the anvil 32.

  Such a jig 50 includes a first jig 51 and a second jig 52. The first jig 51 sandwiches and holds the first metal member (part of the metal members) 41 among the plurality of metal members 40, and the first and second members 51 a for sandwiching the first metal member 41. , 51b. The second jig 52 sandwiches and holds the second metal member (the remaining metal members excluding some of the metal members) 42 among the plurality of metal members 40, and the second jig 52 sandwiches the second metal member 42. 1 and second members 52a and 52b. The first and second members 51a, 51b, 52a, and 52b of the first jig 51 and the second jig 52 sandwich and hold the plurality of metal members 40 to fix the plurality of metal members 40. Become.

  In such an ultrasonic bonding apparatus 1, heat is generated in the plurality of metal members 40 by ultrasonic vibration. The generated heat greatly contributes to the bonding between the plurality of metal members 40, and has an effect of increasing the bonding strength. Therefore, the ultrasonic bonding apparatus 1 according to the first embodiment conducts heat through part of the horn 31, the anvil 32, the first jig 51, and the second jig 52 in order to effectively use such heat. It is a member with a low rate.

  More specifically, the horn 31 includes a tip portion 31a that is in contact with the first metal member 41 (any one of a plurality of metal members), and a horn body portion 31b that holds the tip portion 31a. The part 31a is formed of a member having a lower thermal conductivity than the horn body part 31b.

  Further, the anvil 32 also includes a front end portion 32a that contacts the second metal member 42 and an anvil main body portion 32b that holds the front end portion 32a, and the front end portion 32a has lower thermal conductivity than the horn main body portion 31b. It is formed with a member.

  In addition, the first jig 51 and the second jig 52 are entirely formed of a member having a lower thermal conductivity than the horn main body 31b.

  Specifically, the horn main body 31b and the anvil main body 32b are made of tool steel, and the tip portions 31a and 32a, the first jig 51 and the second jig 52 are made of ceramic, titanium, chrome nickel steel, or the like. .

  Thereby, the generated heat can be contained. That is, since the tip 31a of the horn 31 is formed of a member having a low thermal conductivity, the heat generated at the time of joining is difficult to dissipate toward the horn body 31b as indicated by reference numeral H1. Furthermore, since the tip end portion 32a of the anvil 32 is formed of a member having low thermal conductivity, the heat generated at the time of joining is difficult to dissipate to the anvil body portion 32b side as indicated by reference numeral H2. In addition, since the entire first and second jigs 51 and 52 are formed of members having low thermal conductivity, the heat generated at the time of joining is shown on the side of the jigs 51 and 52 as indicated by symbols H3 and H4. It becomes difficult to dissipate heat. Therefore, the generated heat is confined and contributes effectively to the bonding.

  In the first embodiment, the jig 50 is entirely formed of a member having a lower thermal conductivity than the horn main body 31b. However, the present invention is not limited to this, and at least one of the plurality of metal members 40 (first In one embodiment, the portion in contact with the first or second metal member 41, 42) may be configured with a member having low thermal conductivity. Moreover, about the anvil 32, not only the front-end | tip part 32a but the whole may be formed with the member whose heat conductivity is lower than the horn main-body part 31b.

  FIG. 3 is a graph showing the bonding strength of the first and second metal members 41 and 42 in the present embodiment and the comparative example. In FIG. 3, the vertical axis represents the tensile strength (N) required to peel off the first and second metal members 41, 42, and the horizontal axis is applied to the first and second metal members 41, 42. The set energy (J) is shown. Moreover, the comparative example shows an example that does not have a member having a lower thermal conductivity than the horn body 31b as in the ultrasonic bonding apparatus 1 according to the present embodiment.

  As shown in FIG. 3, in this embodiment, when the set energy is 10 J and 20 J, the tensile strength is less than 150 N and about 190 N, respectively. Moreover, tensile strength was set to about 225N in setting energy 30J, 40J, and 50J.

  On the other hand, in the comparative example, when the set energy was 10J, 20J, 30J, 40J, and 50J, the tensile strengths were about 60N, 150N, about 170N, about 175N, and about 180N, respectively.

  As described above, in this embodiment, the tensile strength higher than that of the comparative example is shown in all set energies, and it was found that the generated heat can be contained and the strength of the joint can be increased.

  Thus, according to the ultrasonic bonding apparatus 1 according to the first embodiment, the tip portion 31a of the horn 31, and the tip portion 32a of the anvil 32 and the entire jig 50 are heated more than the horn body portion 31b. Since it is formed of a member having low conductivity, heat generated in the plurality of metal members 40 due to ultrasonic vibrations is difficult to escape to the horn 31, the anvil 32, and the jig 50, and the generated heat is contained. be able to. Thereby, the strength of the bonding can be increased by effectively using heat.

  Next, a second embodiment of the present invention will be described. The ultrasonic bonding apparatus according to the second embodiment is the same as that of the first embodiment, but the configuration is partially different. Hereinafter, differences from the first embodiment will be described.

  FIG. 4 is a front view of the ultrasonic bonding apparatus 2 according to the second embodiment. As shown in FIG. 4, the ultrasonic bonding apparatus 2 according to the second embodiment includes an ultrasonic bonding portion 30 and a jig 50 as in the first embodiment, and further includes a power source 60a and wirings 61 and 62. A heating unit (heating means) 60 is provided.

  The power source 60a is a DC power source, for example. The power source 60a may be an AC power source, or the vibration power source 10 of the vibrator 20 shown in FIG. 1 may be used. The first wiring 61 is an electric wire that connects the power source 60 a and the first member 51 a of the first jig 51. The first wiring 61 may be connected to the second member 51b. The second wiring 62 is an electric wire that connects the power source 60 a and the first member 52 a of the second jig 52. Note that the second wiring 62 may also be connected to the second member 52b. In addition, an electrode for energization may be provided at the tip of the first and second wirings 61 and 62, and the electrode or the like may be connected to the first members 51a and 52a.

  Because of the connection relationship between the wirings 61 and 62, the heating unit 60 causes current to flow through the first member 51 a of the first jig 51, the plurality of metal members 40, and the first member 52 a of the second jig 52. It will energize both the 1st jig | tool 51 and the 2nd jig | tool 52 so that it may flow.

  Further, in the second embodiment, the second member 51b of the first jig 51 and the second member 52b of the second jig 52 are entirely constituted by an insulating member. In addition, the 2nd members 51b and 52b are not restricted to the whole, The location which touches the metal member 40 at least may be comprised with the insulating member. In addition, as for the horn 31 and the anvil 32, it is preferable that at least a portion in contact with the metal member 40 is constituted by an insulating member.

  Since it is the above structures, the ultrasonic bonding apparatus 2 which concerns on 2nd Embodiment can aim at the high intensity | strength of joining using a heat | fever effectively.

  First, in the second embodiment, the first jig 51 and the second jig 52 are heated by generating Joule heat when energized. Therefore, not only heat dissipation is suppressed through the first jig 51 and the second jig 52, but the plurality of metal members 40 are heated through the jig 50.

  Furthermore, since the first jig 51, the plurality of metal members 40, and the second jig 52 are energized so that current flows, Joule heat is generated in the plurality of metal members 40, and the plurality of metal members 40 are It will be heated. In particular, Joule heat is generated more by the contact resistance of the portion SR where the plurality of metal members 40 are overlapped, and the portion SR is efficiently heated.

  Therefore, it can be said that the ultrasonic bonding apparatus 2 according to the second embodiment can increase the strength of bonding by effectively using heat.

  In particular, since the second members 51b and 52b of the first jig 51 and the second jig 52 are insulating members, the current flowing through the first members 51a and 52a flows to the ground through the second members 51b and 52b. Such a situation can be prevented, and the plurality of metal members 40 are suitably heated.

  In addition, when at least a portion of the horn 31 and the anvil 32 that is in contact with the metal member 40 is configured by an insulating member, the current hardly flows to the horn 31 or the anvil 32, and the plurality of metal members 40 are more It will heat more suitably.

  Thus, according to the ultrasonic bonding apparatus 2 according to the second embodiment, since the heating unit 60 that energizes the first jig 51 and the second jig 52 is provided, the components other than the horn 31 and the anvil 32 are provided. The jig 50 that holds the metal member 40 is heated, and not only the heat dissipation through the jig 50 is suppressed, but also the plurality of metal members 40 are heated through the jig 50. Therefore, it is possible to increase the strength of bonding by effectively using heat.

  Since the jig 50 presses and fixes the plurality of metal members 40, the heating unit 60 is attached to a member that vibrates like the horn 31 or a member that easily receives vibration from the horn 31 such as the anvil 32. Therefore, the member in which the electrode for energization or the like is difficult to be removed is heated by energization, and the possibility that the energization cannot be performed due to the removal of the electrode or the like can be reduced.

  In addition, since the heating unit 60 energizes the first jig 51, the plurality of metal members 40, and the second jig 52 so that current flows, the plurality of metal members 40 themselves are also heated by energization. Higher bonding strength can be achieved.

  One member 51a, 52a of the two members 51a, 51b, 52a, 52b of the first jig 51 and the second jig 52 is energized by the heating unit 60, and the other member 51b, 52b is It is comprised by the insulating member. For this reason, it can prevent that the electric current which flowed to one member 51a, 52a among the jig | tool 50 flows into the other member 51b, 52b as it is, and can heat several metal member 40 itself suitably.

  As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the spirit of the present invention. You may make it combine a technique or a well-known and well-known technique.

  For example, in the above-described embodiment, the example in which the two members of the first and second metal members 41 and 42 are joined has been described. However, the invention is not limited to the two members, but three or more members may be joined. Good.

  Moreover, in 2nd Embodiment, although the heating part 60 is heating both the jigs 51 and 52, it is not restricted to this, You may be comprised so that only one jig | tool 51 and 52 may be heated. . This is also because the plurality of metal members 40 can be indirectly heated by heating one of the jigs 51 and 52.

  Furthermore, in 2nd Embodiment, the contact location with any one of the some metal member 40 among the 2nd members 51b and 52b of the 1st jig | tool 51 and the 2nd jig | tool 52, the horn 31, and the anvil 32 is 1st. As in the first embodiment, it is preferable that the member has a lower thermal conductivity than the horn body 31b. This is because there is a heat containment effect.

1, 2: Ultrasonic bonding apparatus 10: Power supply 20: Vibrator 30: Ultrasonic bonding part 31: Horn 31a: Tip part 31b: Horn main body part 32: Anvil 32a: Tip part 32b: Anvil main part 40: Multiple metals Member 41: 1st metal member (a part of metal members)
42: second metal member (remaining metal member)
50: Jig 51: First jig 51a, 51b: Two members 52: Second jig 52a, 52b: Two members 60: Heating unit (heating means)
60a: power supply 61: first wiring 62: second wiring SR: part

Claims (4)

It is an ultrasonic joining apparatus that joins a plurality of metal members by superimposing a plurality of metal members to be joined, and applying ultrasonic vibration to the overlapped portion,
An anvil on which a portion where the plurality of metal members are superposed is placed;
A horn that is provided on the opposite side of the anvil across the part, and that applies ultrasonic vibration to the part,
A jig for positioning the portion between the horn and the anvil by sandwiching and pressing the plurality of metal members,
The horn is composed of a tip portion in contact with any one of the plurality of metal members, and a horn main body portion holding the tip portion,
The tip of the horn, and the portion of the anvil and the jig that are in contact with any of the plurality of metal members are formed of a member having a lower thermal conductivity than the horn main body. Ultrasonic bonding device. It is an ultrasonic joining apparatus that joins a plurality of metal members by superimposing a plurality of metal members to be joined, and applying ultrasonic vibration to the overlapped portion,
An anvil on which a portion where the plurality of metal members are superposed is placed;
A horn that is provided on the opposite side of the anvil across the part, and that applies ultrasonic vibration to the part,
A first jig for sandwiching and pressing a part of the plurality of metal members, and a second jig for sandwiching and pressing the remaining metal members of the plurality of metal members excluding the part of the metal members. A jig for positioning the portion between the horn and the anvil by holding the first jig and the second jig;
Heating means for heating at least one of the first jig and the second jig by energizing at least one of the first jig and the second jig;
An ultrasonic bonding apparatus comprising: The heating means energizes both the first jig and the second jig so that a current flows through the first jig, the plurality of metal members, and the second jig. The ultrasonic bonding apparatus according to claim 2, wherein The first jig is composed of two members for sandwiching the part of the metal member,
The second jig is composed of two members for sandwiching the remaining metal member,
One of the two members of the first jig and the second jig is energized by the heating means,
4. The super member according to claim 3, wherein the other member of the two members of the first jig and the second jig is formed of an insulating member at least at a position in contact with the metal member. Sonic bonding device.

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