JP3597476B2 - Ultrasonic vibration horn in ultrasonic welding equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the field of ultrasonic vibration welding technology in which a resonator is operated using ultrasonic vibration to weld and weld a thermoplastic resin or metal.
[0002]
[Prior art]
Conventionally, in this type of ultrasonic vibration welding technology, a resonator (horn) is brought into contact with a joining member to induce ultrasonic vibration and to expand and contract minutely in the direction of its central axis to cover the joining member. In this case, the method in which the outer end surface perpendicular to the central axis of the horn is brought into contact with the joining member to perform the welding process is referred to as a longitudinal vibration method, and the horn is attached to the central axis of the horn. A system that uses side surfaces that are parallel directions is called a lateral vibration system.
[0003]
As the welding technique of the lateral vibration method, for example, the technique shown in FIG. 10 is known (prior art).
[0004]
That is, the joining member W1 is temporarily attached to the side surface (joining surface) of the ultrasonic horn M having the nodal point supported by the support means E using a vacuum suction means or the like, and the desired position of the member W2 to be joined is determined. In this state, the ultrasonic horn M is resonated by the ultrasonic vibration generator P in a state where the joining member W1 is pressed against the welding member W1 to perform welding processing.
[0005]
At this time, if the vibration of the ultrasonic horn M is parallel to the member W2 to be joined, the bonding efficiency is improved. Therefore, the ultrasonic horn M is generally arranged in a horizontal direction.
[0006]
However, in the horizontal orientation shown in FIG. 10, the ultrasonic vibration can be given only in the horizontal direction. However, the ultrasonic horn M and the ultrasonic vibration generator P are not connected to the members (not shown) around the member W2. Interference was easy, and the work of ultrasonic bonding was difficult.
[0007]
As a countermeasure against such a problem, when the ultrasonic horn M is used obliquely upward as shown in FIG. 11, a pass line (space) G is formed between the ultrasonic horn M and the periphery on the member to be joined W2, The operation of sonic bonding becomes easy.
[0008]
However, as shown in FIG. 11, in synchronization with the vibration of the ultrasonic horn M in the axial direction indicated by the arrow in the axial direction, the vibration (longitudinal component) that expands and contracts in the orthogonal direction as indicated by the arrow is generated.
[0009]
The amplitude of the vertical component is about 20% of the amplitude of the horizontal component of the ultrasonic horn M.
[0010]
However, the vibration of the vertical component causes an action in the peeling direction between the joining member W1 and the member to be joined W2, which may not only lower the joining accuracy but also cause damage such as damage. It is difficult to expect a highly efficient ultrasonic bonding operation.
[0011]
[Problems to be solved by the invention]
The present invention has been made to solve the above-mentioned problems, and has the following problems.
[0012]
That is, a first problem to be solved by the present invention is to provide a device capable of securing a sufficient pass line on a joining member and facilitating a welding process.
[0013]
A second problem to be solved by the present invention is to provide an ultrasonic horn capable of eliminating ultrasonic vibration components in the vertical direction by an ultrasonic horn and greatly improving the bonding accuracy between joining members. It is.
[0014]
The third problem to be solved by the present invention is that the flexural vibration of the ultrasonic horn reduces the attenuation of the amplitude from the tip and increases the depth, so that not only can the frequency used be increased. It is an object of the present invention to provide a device which can reduce the wavelength to one wavelength or less and can achieve compactness.
[0015]
A fourth problem to be solved by the present invention is to provide a device capable of preventing occurrence of damage to a joining member due to ultrasonic vibration of a longitudinal component.
[0016]
[Means for Solving the Problems]
(1) An ultrasonic vibration horn in an ultrasonic vibration welding device in which ultrasonic vibration is induced by ultrasonic vibration means, wherein a column portion is provided in a cantilever manner with the vibration means, and a column outside the column portion. And a joining operation portion formed in a large diameter at an end portion. The outer periphery of the joining operation portion has a use surface having an inclination angle such that it intersects forward with respect to a longitudinal center axis of the column portion. And a tapered recess centered on the center axis is provided on the front surface thereof, and when the inclination angle of the use surface is 10 to 20 degrees, the recess angle of the recess portion is It is set so as to be 170 ± 20 degrees on the center axis, and the longitudinal vibration component in the direction intersecting the use surface on the use surface is absorbed by the flexural vibration in the joining operation unit, and the transverse vibration component parallel to the use surface is used. Welding process Ultrasonic vibration horn as can row.
(2) an ultrasonic horn in which the back surface of the joining operation unit is inclined forward with respect to the central axis, and when the inclination angle of the working surface of the joining operation unit is 10 to 20 degrees, The ultrasonic vibration horn according to the above (1) , wherein a forward inclination angle of the back surface is set to be 130 ± 20 degrees on the central axis .
[0017]
Therefore, a sufficient working space can be provided between the ultrasonic vibration device and the joining member or the member to be joined, and the precision of welding can be greatly improved.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of an ultrasonic vibration welding apparatus (this apparatus) 1000 and the ultrasonic vibration horn (horn) 100 according to the present invention will be described with reference to the drawings.
[0019]
1. This device 1000
(1) Configuration {circle around (1)} Overall Configuration As shown in FIG. 9, in this apparatus 1000, the support member 200 places a central axis (L) of the horn 100 described later so that the bonding member W1 can be transported. The ultrasonic vibration supported by the support bracket 210 is disposed at an angle of about 10 to 20 degrees with respect to the transport direction (M, M ') of the holding means 300 such as an XY table. A horn 100 is protruded from the generator 400 in a cantilever manner, and the nodal point NP of the horn 100 is held by a nodal support resonance rod 220. 500.
[0020]
(2) Configuration of each part (a) Support means 200
As shown in FIG. 9, a supporting member 200 capable of suspending the ultrasonic vibration generator 400 by the support bracket 210 attracts the joining member W1 onto the horn 100 by raising and lowering the position changing means 201 of the horn 100, rotating angle adjusting means 202, and the like. A vacuum suction means 203 and the like are provided, and are configured to be driven and controlled by the control means 500.
[0021]
(B) Control means 500
As shown in FIG. 9, it is composed of a personal computer or the like having a data processing function, and can be manually operated by the operation panel 510 to instruct each unit to operate. Can be displayed on the display means 520.
[0022]
(C) Ultrasonic vibration horn (horn) 100
For example, as shown in FIGS. 1 and 2, a horn 100 made of a titanium alloy is inserted into an ultrasonic vibration generator 400 and attached to the other end of a columnar column 110 to which ultrasonic vibration is applied. Form a joining operation section 120 having a larger diameter than the column section 110.
[0023]
As shown in FIGS. 3 and 4, a concave front surface 122 is formed at the outer end of the joining operation section 120 with the center axis (L) of the column section 110 being the deepest central section 121. A polygon that forms an inclined back surface 123 that is continuous with 110 and that abuts on the joining member W1 between the recessed front surface 122 and the back surface 123 during the vibration welding process and that can adsorb and carry the joining member W1. A use surface 124 having a shape is formed, and an inclination angle A (about 10 to 20 degrees) is formed so as to intersect the use surface 124 with the center axis (L) of the column portion 110 in a tapered shape. It is composed.
[0024]
In this case, the longitudinal outer peripheral surface 111 and the rear surface 123 of the column portion 110 are formed so that the forward inclination angle B is obtuse (about 130 ± 20 degrees), and the concave front surface 122 is centered. The concave angle C centered on the part 121 is also formed to be obtuse (about 170 ± 20 degrees).
[0025]
The horn 100 is a half-wave horn that is ultrasonically oscillated with a half-wave amplitude when used, so that a predetermined frequency generated by the ultrasonic vibration generator 400 generates a lateral vibration with an amplitude of about 5 μm. The vibration vectors indicated by arrows in FIGS. 3 and 4 will be described later.
[0026]
The horn 100 is provided with a suction port (H) communicating with the vacuum suction means 203 on the use surface 124 so as to be able to suction the joining member W1.
[0027]
2. Ultrasonic Vibration Welding Process As shown in FIG. 9, the horn 100 is mounted on the ultrasonic vibration generator 400, and the operating means 510 is manually operated with the working surface 124 facing the joining member W1 on the support means 300. Then, the support means 200 is operated by the control means 500 to adjust the position of the horn 100 on which the bonding member W1 is adsorbed by the means 201 to 203, and the ultrasonic vibration generator 400 controls the horn 100, for example, a half-wavelength Ultrasonic vibration is induced to be pressed against and welded to the member to be joined W2, and then the used surface 124 of the horn 100 is replaced with another used surface 124, and the holding means 300 is moved in the direction of the arrow MM ′. The process proceeds to the next welding process.
[0028]
By the way, the gist of the present invention is that the use surface 124 of the horn 100 is inclined with respect to the center axis (L) in the longitudinal direction of the horn 100 to secure the pass line G of the joining member W1, and furthermore, the vertical direction with respect to the joining member W1. The point is that the ultrasonic vibration of the component is not generated, so that the usable depth of the horn 100 can be sufficiently secured.
[0029]
Next, the principle and operation will be described in detail.
[0030]
That is, in the lateral vibration horn 100, the relationship between the distance from the tip of the horn 100 and the magnitude of the amplitude of the horn 100 changes approximately in a COS waveform as shown in FIG. At the position of eight wavelengths, the amplitude generally drops to about 70%, and there is a concern that the quality of the welding process may deteriorate.
[0031]
However, in the horn 100, by specifying the shape of the joining operation part 120 of the horn 100, the attenuation of the amplitude is suppressed to 10% or less by effectively utilizing the bending vibration generated in the horn 100 itself. In addition, an ultrasonic vibration that does not include a longitudinal vibration component can be obtained.
[0032]
Hereinafter, an arrow indicates a vibration vector, the length of which is the amplitude value, and the direction is the vibration mode.
[0033]
That is, as shown in FIGS. 6 and 7, when the use surface 124 of the horn 100 is inclined, it is apparent that longitudinal component vibration occurs on the use surface 124, and it is difficult to avoid this. .
[0034]
On the other hand, as shown in FIG. 8, when the large-diameter joining operation portion 120 is formed on the column portion 110 of the horn 100, the vibration vector changes so as to be concentrated on the central axis (L). It is clear to do.
[0035]
However, also in this case, it is apparent from the vibration vector that the absolute values of the amplitudes are substantially equal at the positions a and b, but it is still possible that the longitudinal component ultrasonic vibration is generated with respect to the use surface 124. It was difficult to avoid.
[0036]
On the other hand, as shown in FIG. 3 and FIG. By specifying as described above, a bending vibration is generated in the joint operation unit 120 of the horn 100 during the ultrasonic vibration to eliminate the longitudinal component of the ultrasonic vibration, and the vibration vector on the use surface 124 is completely parallel to the use surface 124. It was possible to become a state.
[0037]
Further, even in the case of a half-wave horn, the attenuation of the amplitude from the tip is relatively small, and the depth can be sufficiently long, so that the frequency can be increased.
[0038]
The shape of the joining operation section 120 may be on a polyhedron other than a hexahedron, such as a hexadecahedron, or a bifurcated shape other than the polyhedron is within the scope of the design change.
[0039]
【Example】
For reference, a specific example of the above embodiment is as follows.
[0040]
W1 Semiconductor chip component W2 Circuit board horn Titanium alloy inclination angle A Approximately 10 to 20 degrees Forward inclination angle B Approximately 130 degrees Depression angle C Approximately 170 degrees Oscillator frequency 40 kHz
Amplitude: 5 micron time: 0.1-0.3 seconds Pressing force: 5-6 kg weight
【The invention's effect】
The remarkable effects of the present invention described above are as follows.
[0042]
{Circle around (1)} Since a sufficient working space can be formed between the ultrasonic vibration welding means and the processed material (joining member or the like), workability is improved.
[0043]
{Circle around (2)} Since the longitudinal vibration does not occur on the surface of the ultrasonic vibration horn where the horizontal vibration is used, the welding quality is greatly improved.
[0044]
(3) Since the amplitude of the ultrasonic vibration horn is reduced and the depth is lengthened, the frequency can be increased, and even if the ultrasonic vibration is reduced to one wavelength or less, there is no problem in the welding effect. Can be reduced in size and weight.
[0045]
(4) Since the vertical component does not vibrate as in (2) above, there is no possibility that the processed material is damaged.
[Brief description of the drawings]
FIG. 1 is a side view of an ultrasonic vibration horn according to an embodiment of the present invention.
FIG. 2 is a front view of the ultrasonic vibration horn of FIG. 1;
FIG. 3 is a schematic longitudinal sectional view simulating a vibration vector of the ultrasonic vibration horn of FIG. 1;
FIG. 4 is a partially enlarged view of FIG. 3;
FIG. 5 is an amplitude distribution diagram of an ultrasonic vibration horn.
FIG. 6 is a reference diagram of FIG. 3;
FIG. 7 is a reference diagram of FIG. 4;
FIG. 8 is another reference diagram of FIG. 3;
FIG. 9 is a functional block diagram of the ultrasonic vibration welding apparatus.
FIG. 10 is an explanatory diagram of a conventional technique.
FIG. 11 is an explanatory diagram of another conventional technique.
[Explanation of symbols]
1000 Ultrasonic vibration welding device 100 Ultrasonic vibration horn 110 Column unit 120 Joining operation unit 122 Front surface 123 Back surface 124 Usage surface 400 Ultrasonic vibration means (vibration generator)

Claims (2)

An ultrasonic vibration horn in an ultrasonic vibration welding apparatus in which ultrasonic vibration is induced by ultrasonic vibration means, wherein a column portion is provided in a cantilever manner with the vibration means, and an outer end of the column portion is provided. And a joining operation portion formed in a large diameter, and a use surface is formed on an outer periphery of the joining operation portion with an inclination angle such that the inclination portion intersects a center axis line in a longitudinal direction of the column portion in a forward direction. At the same time, a tapered recess centered on the center axis is formed on the front surface thereof, and when the angle of inclination of the used surface is 10 to 20 degrees, the recess angle of the recess is on the center axis. Is set so as to be 170 ± 20 degrees, the longitudinal vibration component in the direction intersecting the use surface in the use surface is absorbed by the flexural vibration in the joining operation part, and the welding process is performed by the transverse vibration component parallel to the use surface. Real Ultrasonic vibration horn that way can. An ultrasonic horn in which a back surface of the joining operation unit is inclined forward with respect to the center axis, and when an inclination angle of a used surface of the joining operation unit is 10 to 20 degrees, 2. The ultrasonic vibration horn according to claim 1, wherein the forward inclination angle is set to be 130 ± 20 degrees on the central axis .

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