KR101012146B1 - Ultrasonic fusioer - Google Patents

Abstract

The ultrasonic fusion machine of the present invention generates friction heat in the fusion space formed at the end of the tool horn by generating the ultrasonic wave and converting the electrical frequency into mechanical vibration through the vibrator from the source and then amplifying the mechanical vibration through the main horn. Amplitude range lost to the outside of the tool fusion fusion space by rotatably mounting the heat source unit and the base plate provided in the fusion space of the tool horn so as to be rotatably attached to the support means installed on the vibrator to bring the load plate mounted on the support means to the fusion space. Consisting of the concentrated section to increase the stress concentration of the surface relief by limiting.

Ultrasound, welding, amplitude, pressing force, welding time

Description

Ultrasonic welding machine {Ultrasonic fusioer}

The present invention relates to an ultrasonic fusion machine, and more particularly, to an ultrasonic fusion machine that enables adjustment of pressing force, welding time, amplitude, and the like, which determine ultrasonic welding efficiency.

Ultrasonic bonding is a new technology that applies the conversion of thermal energy to bond fibers in a fiber assembly using wave energy by ultrasonic waves.

Ultrasonic energy is simply mechanical wave energy that operates at frequencies inaudible to humans. This frequency is usually above 18,000 Hz, which is above the upper limit of the human gamma region.

As the ultrasonic bonding industry expands the scope of polymer materials throughout the industry, polymer materials perform shapes and aesthetics that are difficult to realize with metal materials, thereby bringing advances in the assembly process, production process, molding technology, and bonding technology.

Among them, the joining part may be a heat-bonding method using a low melting point polymer property, such as heating, melting and joining, and ultrasonic joining, vibration joining, and rotation joining using a solid-phase joining method.

Ultrasonic bonding, which has been spotlighted by ubiquitous polymer series or solid-state bonding of metals, is usually converted to due to frictional energy of the bonding interface by amplifying ultrasonic energy using a booster and horn of ultrasonic waves in the range of 15 to 60 kHz. Losing heat is used to bond.

In general, joining by this method is widely used in the homogeneous polymer series, and in some cases, special materials may be attached to realize dissimilar material bonding.

However, as the material to be bonded is diversified, the adhesion conditions are also diversified. However, since there are no welding methods and devices for detailed ultrasonic bonding technologies satisfying each condition, there is an urgent need for research and development of such ultrasonic bonding methods and devices. to be.

Accordingly, it is an object of the present invention to adjust the pressing force, welding time, amplitude, etc. to determine the ultrasonic welding to increase the stress concentration of the surface relief of the base material during ultrasonic welding to improve the welding efficiency.

In addition, an object of the present invention is to be able to be bonded to the exact fusion point by allowing the base material to be mounted without flow at the heat generating point of the heat source.

In order to achieve this object, the ultrasonic fusion machine of the present invention generates an ultrasonic wave, and converts an electric frequency into mechanical vibration from the source through a vibrator, and then amplifies the mechanical vibration through a main horn to form at the end of the tool horn. The heat source unit for generating frictional heat in the welding space and the rotation block mounted with the load plate on the shaft installed in the vibrator are rotated so that the load plate is attached to the welding space by the rotation of the rotation block when the base material provided in the welding space of the tool horn is joined. Corresponding proximity constitutes a concentrator that increases the stress concentration of the surface relief by limiting the amplitude range lost outside the tool fusion fusion space.

According to the present invention, the concentrator is coupled to the vibrator and is disposed vertically downward; a shaft coupled to the bracket in a transverse direction and positioned on the same horizontal line as the ultrasonic welding machine; and vertically upward at the shaft end. Gripping block coupled to the gripping block, which is rotatably installed on the gripping block and protrudes the load plate on the front side, and allows the load plate to be moved forward and backward. It consists of a rotating block to adjust the proximity of the overload plate.

According to the present invention, the load plate is attached to the moving screw is fastened through the rotation block is configured so that the load plate can be moved forward and backward integrally according to the fastening state of the moving screw.

According to the present invention, the gripping block forms a pair of forks with the upper portions spaced apart from each other to position the fusion space of the tool horn in the space between the fork portions, and the rotation block coupled to the gripping block rotates the load plate. It is configured to be guided in the space between the forks.

According to the present invention, the fusion space is formed to partially open the periphery of the four sides.

According to the present invention, the rotation block is provided with an insulator to rotate the rotation block by manual operation.

According to the present invention, the load plate may be integrally formed vertically downward in the center of the front of the rotation block.

According to the invention, the fork portion is configured by combining a clip having an elastic on the top.

As described above, the ultrasonic welding machine of the present invention can adjust the pressing force with the base material by the forward and backward movement of the load plate mounted on the rotating block, the welding time by adjusting the amplitude inside the welding space, and the like. By increasing the stress concentration of the surface relief at the time to improve the fusion efficiency, there is an effect to improve the connectivity, water tightness and airtightness due to the more powerful welding, while shortening the pretreatment and post-treatment process.

In addition, the ultrasonic fusion machine of the present invention by installing an elastic clip on the upper portion of the fusion space to be able to mount the fusion point of the base material on the heating point of the heat source portion accurately and without flow to minimize the defect rate of fusion splicing It works.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in the drawings, the same components or parts are to be noted that the same reference numerals as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

1 is a perspective view showing an ultrasonic welding machine according to the present invention, Figure 2 is an exploded perspective view showing an ultrasonic welding machine according to the invention, Figure 3 is a flow chart showing the mounting process of the base material through the ultrasonic welding machine according to the invention, 4 is a partially enlarged perspective view of the ultrasonic welding machine according to the present invention, FIG. 5 is a partially enlarged front view of the ultrasonic welding machine according to the present invention, FIG. 6 is an exploded perspective view showing another embodiment of the ultrasonic welding machine according to the present invention. Is a partially enlarged front view of FIG. 6.

1 to 5, the ultrasonic welding machine 100 of the present invention is composed of a generator 110, a heat source 120, a concentrator 130.

The generator 110 is a generator for generating ultrasonic waves, and when AC voltage is applied to both sides of the vibrator 121, the generator 110 expands and contracts according to the polarity of the current to generate ultrasonic waves. It is a device to convert the electrical signal of 20kHz or more.

In the present invention, in order to interconnect the fabric, that is, a plurality of polyester (Polyester) or Yarn fabric, such as nylon (Nylon) to be bonded to each other by ultrasonically heating the junction of the overlapping fibers to be fused to each other .

Here, a longitudinal wave in which the vibration direction of the medium in the ultrasonic wave is parallel to the traveling direction of the wave is applied to bond the flexible fiber (hereinafter, referred to as a "base material") to a chemical material.

The heat source unit 120 is for converting the electric frequency of the ultrasonic wave provided from the generator 110 into heat energy, the configuration of which consists of a vibrator 121, the main horn 122, the tool horn 123.

The vibrator 121 converts the electrical frequency of the electrical signal provided from the source into mechanical vibration. In the present invention, the piezoelectric type of the vibrator 121 having the highest efficiency is applied.

This is a sandwich-type oscillator 121 using piezoelectric material called lead nitrate nitrate, which receives high-frequency alternating voltage from the generator 110 and accumulates in the piezoelectric material so that the oscillator 121 expands and contracts according to the change in voltage polarity. This is repeated to generate a vibration amplitude of approximately 10 mu m on the surface area.

At this time, in order to prevent energy loss, the vibrator 121 is assembled at the center of vibration and there is a minimum moving part.

In addition, the main horn 122 amplifies the mechanical vibration converted by the vibrator 121 and transmits the mechanical vibration to the tool horn 123. The tool horn 123 applies the amplified mechanical vibration to the base material 10 to be fused to locally connect the connecting portion where the base material 10 overlaps. Melting is performed so that a pair of base metals 10 to be fused are bonded to each other.

This fusion process will be described in detail below.

When the ultrasonic vibration is applied for the first time, the surface of the base material 10 adhered to the inner surface of the welding space 123a of the tool horn 123 generates very fine surface relief very quickly. The protruding portion of the surface relief is concentrated more stress than other places, and consumes most of the large strain and vibration energy, so that the welded portion melts and flows to the other portion.

At this moment, a thin layer of molten layer is formed on the entire welding surface, and a short time diffusion is achieved by continuous vibration of ultrasonic waves, and the remaining atoms are bonded to the other members with molecular primary bonds. Welding is done.

The welding is carried out in three stages.

Wet state where stress is concentrated on the surface undulation and melting occurs at that part, resulting in a rearrangement of the surface where the height of the surface undulation is lowered, and the part deformed and melted at the surface undulation spreads widely throughout the welding site. When a thin molten layer is formed on the entire welding star, the base material is diffused by ultrasonic vibration and pressing force, and the bonding state of the chain forming the molecular primary bond proceeds, thereby fusion of the pair of base materials 10.

The heat source 120 having such a function enables fusion of the base material 10 and improves the fusion efficiency through the concentrator 130.

As shown in FIG. 2, the configuration of the concentrator 130 is as follows.

A bracket 131 coupled to the vibrator 121 and disposed vertically downward; a shaft 132 coupled to a side of the bracket 131 in a horizontal direction and positioned horizontally on the same horizontal line as the ultrasonic fusion machine 100; and a grip coupled vertically upwardly to an end of the shaft 132. The block 133 and the gripping block 133 are rotatably installed to protrude the load plate 134a on the front surface, and the load plate 134a can be moved forward and backward. It is configured as a rotating block 134 to adjust the proximity state of the fusion space 123a and the load plate 134a while positioning the.

The gripping block 133 forms a pair of fork portions 133a which are spaced apart from each other on the top to position the fusion space 123a of the tool horn 123 in the space between the fork portions 133a, and is rotated to be coupled to the gripping block 133. 134 is guided in the space between the forks 133a.

The rotation block 134 is provided with an insulator 134c to rotate the rotation block 134 by manual operation.

In addition, the load plate 134a is attached to the moving screw 134b penetrated through the rotation block 134 to allow the load plate 134a to move forward and backward according to the fastening state of the moving screw 134b.

The load plate 134a can be moved forward and backward to adjust the degree of closure of the fusion space 123a so that the amplitude of the ultrasonic vibration and the fusion time can be adjusted, and at the same time, it is possible to provide a pressing force to the base material 10 to be fused to improve the welding efficiency. To help.

That is, by adjusting the degree of closure of the inside of the fusion space 123a while separating the base material 10 and the load plate 134a from each other by the movement of the load plate 134a, it is possible to adjust the amplitude and the fusion time accordingly.

In other words, as the amplitude increases, the stress concentration of the surface relief increases, so that the initial temperature rise and the melting occur quickly. In addition, since the loss rate of ultrasonic vibration varies depending on the material of the base material, it is necessary to select an appropriate amplitude according to the material. For example, ABS requires a minimum amplitude of 15 mm (0-P) to allow welding.

In other words, the energy amplified by the resonance of the main horn 122 is obtained at the end of the tool horn 123 using the resonance of the main horn 122 and the energy amplified by the resonance of the main horn 122. The tool horn 123 must satisfy the resonance condition, and the sound velocity transmitted from the main horn 122 is slightly different from the sound velocity in infinite space, but is usually available with an error of less than 10%.

At this time, the size of the resonance is determined according to the size of the generating space.

Specifically, since the magnitude of the amplitude due to resonance is closely determined with the space width of the fusion space 123a where resonance occurs, when the load plate 134a is advanced and drawn into the fusion space 123a, the internal space of the fusion space 123a is narrowed. By adjusting so as to minimize the generation range of resonance within the fusion space 123a, the amplitude can be concentrated and the heat generation temperature can be increased.

On the contrary, when the load plate 134a is reversed to widen the inner space of the fusion space 123a, the generation range of resonance increases and the concentration of amplitude is diluted, thereby lowering the heat generation temperature.

As a result, the concentration and size of the amplitude can be adjusted through the load plate 134a according to the melting temperature of the different base materials 10.

Further, the welding time is closely related to the amplitude. When the amplitude is large, the welding time is shortened, and when the amplitude is small, the welding time is long.

Of course, the fusion time may be adjusted according to the material of the base material 10.

This is because when the molten layer is sufficiently formed on the welding surface, the welding strength is improved, and thus sufficient welding time is required.

However, if the pressing force or the welding time is too excessive, the flow of the molten layer becomes too excessive and the arrangement of the polymer chains to be perpendicular to the welding surface causes an arrangement parallel to the welding surface, thereby lowering the welding strength.

In addition, the pressing force generated when advancing the load plate 134a to press the base material 10 affects the initial temperature rise and the flow of the molten base material 10, thereby doubling the flow of the melt, accelerating the mixing of the chain, and the molten weld surface. Adhesion to increase welding strength.

In order to prevent the mounting and flow of the base material 10 to be fused to the concentrating part 130, the clips 133b having elasticity are coupled to the upper portions of the fork parts 133a of the gripping block 133, respectively, and the base material 10 is inserted into the clip 133b to form the base material 10 in the fusion space 123a. Is arranged so as to penetrate in the transverse direction.

In addition, as illustrated in FIG. 6 or 7, the load plate 134a may further be integrally formed vertically downward in the center of the front surface of the rotation block 134.

This is for the purpose of making it suitable for mass production if the load plate 134a cannot be moved forward or backward, but the size of the same base material 10 and the base material 10 are constant.

As shown in FIG. 3, the operation of the concentrator 130 is as follows.

The concentrator 130 rotates the rotation block 134 equipped with the load plate 134a on the shaft 132 installed on the vibrator 121 to rotate the fusion space 123a by rotating the rotation block 134 when the base material 10 provided in the fusion space 123a of the tool horn 123 is joined. By correspondingly approaching the load plate 134a, the stress concentration of the surface relief is increased by limiting the amplitude range lost outside the fusion space 123a.

In addition, the fusion space 123a is formed so as to partially open the periphery of the four surfaces so as to overlap a pair of base material 10 in the transverse direction of the opened portion, and formed so that the load plate 134a can be embedded in the longitudinal direction. do.

The load plate 134a generates heat, softening, and melting of the inside of the base metal 10 when the ultrasonic wave propagating through the vibrator 121 through the vibrator 121 generates minute mechanical vibration into the fusion space 123a of the tool horn. Proceed. At this time, the load plate 134a may pressurize the base material 10 and at the same time partially close the fusion space 123a with the front opening to block the amplitude range lost to the outside to increase the concentration of stress in the surface relief, thereby improving the fusion efficiency of the base material 10. .

Here, the load plate 134a affects the initial temperature rise and the flow of the molten base 10 by the pressing force of the base 10, thereby doubling the flow of the melt, accelerating the mixing of the chains, and adhering the molten welding surface, It has the effect of increasing strength.

Thus, the product produced by the bonding through the ultrasonic fusion machine 100 of the present invention is beautiful in appearance, and forms an interface having a high bonding force to provide reliability for the bonding.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have the knowledge of.

1 is a perspective view showing an ultrasonic welding machine according to the present invention.

Figure 2 is an exploded perspective view showing an ultrasonic fusion machine according to the present invention.

Figure 3 is a flow chart showing the mounting process of the base material through the ultrasonic welding machine according to the present invention.

4 is a partially enlarged perspective view of the ultrasonic welding machine according to the present invention.

5 is a partially enlarged front view of the ultrasonic welding machine according to the present invention;

Figure 6 is an exploded perspective view showing another embodiment of the ultrasonic welding machine according to the present invention.

FIG. 7 is a partially enlarged front view of FIG. 6. FIG.

<Description of the symbols for the main parts of the drawings>

10: base material 100: ultrasonic welding machine

110: generator 120: heat source

121: vibrator 122: main horn

123: tool horn 123a: fusion space

130: concentrator 131: bracket

132: shaft 133: gripping block

133a: fork 133b: clip

134: rotation block 134a: load plate

134b: Moving screw 134c: Insulator

Claims (8)

A generator for generating ultrasonic waves; A heat source unit for generating frictional heat in the fusion space formed at the end of the tool horn by converting the electric frequency into mechanical vibrations through the vibrator from the source and then amplifying the mechanical vibrations through the main horn; Amplitude that is lost to the outside of the fusion space by rotatably installing a rotation block equipped with a load plate on the shaft installed in the vibrator to closely match the load plate to the fusion space by rotation of the rotation block when the base material provided in the fusion space of the tool horn is joined. Ultrasonic fusion machine characterized in that the consisting portion is configured to increase the stress concentration of the surface relief by limiting the range. The method of claim 1, The concentrator, A bracket coupled to the vibrator and disposed vertically downward; A shaft coupled to the bracket in a transverse direction and positioned on a horizontal line in an ultrasonic welding machine; A gripping block vertically coupled to the shaft end; It is rotatably installed on the gripping block and protrudes the load plate on the front side, and allows the load plate to move forward and backward. Ultrasonic welding machine, characterized in that consisting of a rotating block to adjust the state. The method of claim 1, The load plate is attached to the moving screw is fastened through the rotation block is ultrasonic welding device characterized in that the load plate is configured to be moved forward and backward according to the fastening state of the moving screw. 3. The method of claim 2, The gripping block forms a pair of forks having the upper portions spaced apart from each other to position the fusion space of the tool horn in the space between the fork portions, and the rotation block coupled to the gripping block rotates the load plate in the space between the fork portions. Ultrasonic welding machine, characterized in that configured to be guided from. The method of claim 1, Ultrasonic fusion splicer characterized in that the fusion space is formed to partially open the circumference of the four sides. The method of claim 1, And an insulator installed on the surface of the rotating block to rotate the rotating block by manual operation. The method of claim 1, The load plate is an ultrasonic fusion device, characterized in that it further comprises that it may be integrally formed vertically downward in the center of the front of the rotation block. The method of claim 4, wherein Ultrasonic fusion device characterized in that the fork portion is configured by combining a clip having an elastic on the upper portion.

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