JP3600431B2 - Ultrasonic welding equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the field of ultrasonic bonding technology in which ultrasonic vibrations are applied to superposed members such as a metal or resin material which are superimposed and bonded together.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of apparatus, for example, one disclosed in U.S. Pat. No. 3,955,740 (known example) is known.
[0003]
The feature of this vibration welding apparatus is that a vibration assembly is mounted via a pair of metal diaphragms 30 and 32 in a cylindrical housing 28 rotatably supported by the columns 12 and 14. The converter 16 is integrally connected to one side of the body 18 with a diaphragm 30 interposed therebetween, and the horn 20 is integrally connected to the other side with a diaphragm 32 interposed therebetween. The surface 52 faces a workpiece W carried on an anvil wheel 50 that can be raised and lowered.
[0004]
Therefore, the horn 20 can be vibrated by half-wave resonance vibration in the cylindrical housing 28, and the workpiece W can be welded.
[0005]
As a prior art by the present applicant, as shown in FIGS. 6 and 7, a booster C1 is connected to both ends of a horn A1 with a diaphragm resonance plate B11 interposed therebetween, and further another diaphragm resonance plate B12 is interposed. The converter D1 and the fixing horn D2 are integrally connected in series in a series, and the diaphragm resonance plates B11 and B12 are connected to both ends of the cylindrical body E1 fitted on the booster C1, thereby fixing the cylindrical body E1. An example is a type in which the horn A1 is supported by F1 and supported in a double-supported manner and supported at a maximum displacement point (a polar mount type booster) (Prior example 1).
[0006]
Further, as another prior art, as shown in FIG. 8, a carrier G2 is fixed on a booster C2 connected to both ends of a horn A2, and the carrier G2 is fixed by fixing means so that the horn A2 is nodal point. (Solid type booster) (Prior example 2).
[0007]
[Problems to be solved by the invention]
In the known example described above, since the horn 20 is cantilevered, for example, in transverse vibration ultrasonic welding, when the welding area becomes larger than a certain level, a high pressurization is required. If strengthened, the booster support will bend, causing uneven pressure on the weld surface, which may result in uneven welding on the entire surface.
[0008]
In the case of the preceding example 1 or 2, the welding processing ability by ultrasonic vibration is not particularly inferior and is effective. A method of screwing and supporting from the direction is adopted. In this case, the vibration wavelength is three in the case of the prior example 1, the structure is complicated, and the horn exchange operation is not easy. Even if it is possible, the maintainability will be good, but not only may the support part be located at a position remote from the pressure point, causing a bending phenomenon, but also the burden on the screw for connecting the horn and the booster will increase. In addition, since the oscillation wavelength becomes 2.5 wavelengths, the length dimension of each becomes large, and it is unavoidable to increase the size of the apparatus, and there is a problem that it becomes difficult to incorporate the apparatus into an automatic machine.
[0009]
A first problem to be solved by the present invention is to provide an apparatus in which the entire resonance means has two wavelengths, has a small vibration loss, and can be subjected to an effective welding process.
[0010]
A second problem to be solved by the present invention is to provide a device which does not cause a problem due to the bending phenomenon even when the support portion is located at a position remote from the pressing point.
[0011]
A third problem to be solved by the present invention is to provide a horn joint having a high reliability.
[0012]
A fourth problem to be solved by the present invention is to provide a device having a simple configuration, being compact and having excellent welding ability.
[0013]
A fifth problem to be solved by the present invention is to provide a horn that can be replaced without disassembling the diaphragm and its fixing ring, thereby improving the maintainability.
[0014]
A sixth problem to be solved by the present invention is to provide a horn and a diaphragm which can be fitted and connected to each other to thereby prevent reproducibility at the time of assembling and prevent the horn from shifting.
[0015]
[Means for Solving the Problems]
Specific means for solving the above-mentioned problems are as follows.
[0016]
(1) An ultrasonic welding apparatus that performs ultrasonic welding with a pressing force on a work material such as a metal or a resin material that is supported by being superimposed, and performs a welding process by interposing a diaphragm and a converter and The fixing horn is integrally connected to support the horn in a two-sided manner, and the horn is set so that the vibration between the maximum displacements N ₁ and N ₂ becomes one wavelength (L). vibration loss maximum Fuhaba H is obtained is constituted such that the minimum state at the position, the maximum displacement N _1, the length of the N ₂ to the side edges of the side edges and converters fixing horn An ultrasonic welding apparatus in which each is configured to have a distance of half a wavelength (L / 2) and the total length of the vibration means is set to be equal to two wavelengths (2L) .
[0017]
(2) The ultrasonic welding apparatus according to (1), wherein the center opening of the diaphragm is fitted to the step of the horn, and the diaphragm is connected so as to be sandwiched between the horn, the converter, and the horn and the fixing horn. .
[0018]
Therefore, according to the present invention, it is possible to obtain a simple structure, small size, excellent maintainability and high practicality.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
In the ultrasonic welding apparatus DE according to the embodiment shown in FIGS. 4 and 5, a horizontal frame 12 is connected to a pair of vertical frames 11 and 11 ′ provided on a base 10. The resonating means 30 is carried between supporting portions 21 and 22 vertically suspended on an elevating frame 20 which can be moved up and down. A workpiece W is placed on a support 13 fixed to the base 10. An anvil 40 that can be placed is fixed.
[0020]
The column 23 connected to the lifting frame 20 can be driven up and down by an air cylinder 60 disposed on the horizontal frame 12, and can urge a horn 31 described later in the direction of the workpiece W. Things.
[0021]
As shown in FIGS. 1 to 3, both ends of the horn 31 in the resonance means 30 are supported by the supporting portions 21 and 22 in a double-supported shape at the maximum amplitude point. The outer end is connected to the converter 34 and the fixing horn 35 by a connecting screw 39 as shown in FIGS. 2 and 3, and a step portion 32A having a small thickness is formed at the outer end of the large diameter portion 32. The central opening 33A of the diaphragm 33 formed so that the thickness (Y) is somewhat larger than the thickness (X) of the step 32A is fitted to the step 32A, and further, the converter 34 and the like. A radial fixing horn 35 is integrally connected to both side edges of the horn 31 so as to sandwich the diaphragm 33.
[0022]
Further, the diaphragm 33 is sandwiched between a first ring 36A having a large thickness, a second ring 36B having a small thickness and the diaphragm 33, and integrally clamped by bolts 37.
[0023]
Further, the horn 31 is supported in a two-sided manner by fixing the converter 34 in the support portions 21 and 22 of the lifting frame 20. In this embodiment, as shown in FIG. The vibration of the horn 31 between the maximum displacements N1 and N2 is set to be one wavelength (L), and the maximum amplitude (H) is obtained at the top 31A position of the horn 31 and the welding process is performed in a state where the vibration loss is minimum. Further, the lengths from the maximum displacements N1 and N2 to the side edges of the fixing horn 35 and the converter 34 are half a wavelength (L / 2) from each other. ing.
[0024]
Accordingly, when the workpiece W placed on the anvil 40 is subjected to the welding process by this apparatus DE, the top 31A of the horn 31 is positioned above the welding position of the workpiece W, and the converter 31 is superposed on the converter 34 by a driving means (not shown). The sonic vibration is induced, the lifting frame 20 is lowered, and the work material W is heated by the ultrasonic vibration while the work material W is pressed by the top 31A of the horn 31 to perform the welding process.
[0025]
As described above, the horn 31 has a length corresponding to one wavelength, and the length from the maximum displacements N1 and N2 to the outer ends of the converter 34 and the fixing horn 35 is a half wavelength (L / 2). Therefore, as a result, the total length of the vibration means 30 is equal to two wavelengths (2 L), and the diaphragm 33 supports the maximum amplitude point, but the vibration does not leak to the ring portions 36A and 36B, and The ultrasonic vibration is effectively transmitted to the top 31A without disturbing the ultrasonic vibration, and high-quality ultrasonic welding can be performed without causing a difference in a welding state even in a state of being pressurized at a high pressure. .
[0026]
【The invention's effect】
The specific effects provided by the present invention described above are as follows.
[0027]
{Circle around (1)} The entire length of the resonance means is equivalent to two wavelengths and can be made compact.
[0028]
(2) The replacement of the horn is easy and maintenance is improved.
[0029]
(3) It can prevent the horn from shifting and perform a high quality welding process.
[Brief description of the drawings]
FIG. 1 is a side view of a vibration unit in an ultrasonic welding apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a circle (a) in FIG. 1;
FIG. 3 is an enlarged view of a circle (b) in FIG. 1;
FIG. 4 is a front view of the ultrasonic welding apparatus according to the embodiment of the present invention.
FIG. 5 is a side view of FIG. 4;
FIG. 6 is a side view of the first prior art.
FIG. 7 is a partially enlarged view of FIG. 6;
FIG. 8 is a side view of the second prior art.
[Explanation of symbols]
DE Ultrasonic welding device 31 Horn 32A Step 33 Diaphragm 34 Converter 35 Fixing horn

Claims (2)

An ultrasonic welding apparatus that performs ultrasonic welding together with a pressing force on a work material such as a metal or resin material that is supported by being overlapped, and performs a welding process. The ultrasonic welding device includes a diaphragm and a converter and a fixing horn. Are integrally connected to support the horn in a two-sided manner, and the vibration of the horn between the maximum displacements N ₁ and N ₂ is set so as to be one wavelength (L). The amplitude H is obtained so that the vibration loss is minimized, and the lengths from the maximum displacements N ₁ , N ₂ to the side edges of the fixing horn and the converter are all half. An ultrasonic welding apparatus configured so as to have a distance of wavelength (L / 2) and set so that the total length of the vibration means is equal to two wavelengths (2L) . The ultrasonic welding apparatus according to claim 1, wherein a center opening of the diaphragm is fitted to a step portion of the horn, and the diaphragm is connected so as to be sandwiched between the horn and the converter and between the horn and the fixing horn.

Images