JP3951332B2 - Ultrasonic welding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention welding members together made of resin to ultrasonic soluble wearing location of joining by ultrasonic welding.
[Prior art]
[0003]
The 5-7 shows a working process in the case of producing a hollow blade of aerofoil shape using conventional ultrasonic soluble wearing location. That is, this hollow wing is obtained by joining the first wing body 41 and the second wing body 42 made of resin, which are separately formed in advance, by joining them by ultrasonic welding. As shown in FIG. 2, the second wing body 42 is abutted on the shelf surface 43 provided on the surface 41a side of the first wing body 41, and the outer peripheral wall surface 44 of the first wing body 41 and the second wing body The inner peripheral wall surface 45 of the body 42 is placed in close proximity to each other with a predetermined gap 46. In this state, the horn 40 of the ultrasonic welding apparatus is placed on the abutting portion between the first wing body 41 and the second wing body 42, that is, on each surface 41 a, 42 a side of the portion corresponding to the shelf surface 43. The tip surface 4a is arranged so as to face the respective surfaces 41a and 42a.
[0004]
Thereafter, the horn 40 is pressed against the surfaces 41a and 42a with a predetermined pressing force while being ultrasonically vibrated in the axial direction (arrow direction) by ultrasonic waves from an oscillator (not shown). Then, upon receiving the ultrasonic vibration of the horn 40, first, the abutting portion of each of the wing bodies 41 and 42 including the shelf surface 43 of the first wing body 41 and its peripheral portion are appropriately melted by frictional heat. In this portion, the wing bodies 41 and 42 are welded to each other. Moreover, in the part which contacted the front end surface 40a of the said horn 40, and its peripheral part, these parts melt | dissolve moderately with frictional heat, and the said horn 40 each pushes out molten resin to the circumference | surroundings by the pressing force concerning it, said each said The first wing bodies 41 and 42 are immersed from the surfaces 41a and 42a by a predetermined amount. With the immersion of the horn 40, a part of the molten resin is pushed into the gap 46 side and integrated with the molten resin on the shelf surface 43 side, while the other part is the outer peripheral surface 40b of the horn 40. Along the upper and lower surfaces 41a and 42a of the wing bodies 41 and 42.
[0005]
Therefore, when the horn 40 is removed after the welding is completed, as shown in FIG. 7, the surface 41 a, the surface 41 a, the joint portion between the first wing body 41 and the second wing body 42 from the shelf surface 43 portion. A series of molten resin portions 50 that reach 42a and further protrude upward in a cylindrical shape are formed, and these both are integrally joined by the molten resin portion 50.
[Problems to be solved by the invention]
[0006]
However, in the molten resin portion 50, the portions raised from the surfaces 41a and 42a of the wing bodies 41 and 42 are burrs 51 generated by the bonding process, and the bonding strength between the wing bodies 41 and 42 is as follows. In addition to impairing the appearance of the surface of the hollow blade, the blower fan equipped with this hollow blade is also a source of wind noise due to its rotation. Absent. For this reason, conventionally, the burr 51 is removed after the wings 41 and 42 are joined by ultrasonic welding. However, the removal of the burrs 51 increases the number of work steps in the ultrasonic joining work. Therefore, it is necessary to eliminate the excision of the burr 51 from the viewpoint of reducing the work cost.
[0007]
The generation of such burrs 51 is more conspicuous when each of the wing bodies 41 and 42 is made of a low melting point / low viscosity resin such as polypropylene.
[0008]
Therefore, the present invention eliminates the subsequent work of burr cutting by reliably and reliably preventing the generation of burrs associated with ultrasonic welding, thereby realizing a reduction in the cost of the welding process. It has been made an acoustic soluble wearing location as proposed plugs.
[Means for Solving the Problems]
[0009]
In the present invention, the following configuration is adopted as a specific means for solving such a problem.
[0010]
In the ultrasonic welding apparatus according to the first invention of the present application, the abutting portions of the resin-made first welding member and the second welding member which are arranged to collide with each other are appropriately melted and welded by ultrasonic vibration. A horn that receives ultrasonic waves from an oscillator and ultrasonically vibrates in an axial direction thereof, and a tip surface positioned at one end in the axial direction is pressed against the abutting portion; and an outer peripheral surface of the horn. A cylindrical deformation restricting member that is inserted and arranged so as to be relatively movable in the axial direction with a minute gap on the outside, and is disposed between the horn and the deformation restricting member, and the deformation restricting member is disposed with respect to the horn. An elastic support member that is elastically supported in the axial direction is provided.
[0011]
The ultrasonic welding apparatus according to the second invention of the present application is characterized in that, in the ultrasonic welding apparatus according to the first invention, the deformation regulating member is made of wood or mica.
[0012]
An ultrasonic welding apparatus according to a third invention of the present application is characterized in that, in the ultrasonic welding apparatus according to the first or second invention, the elastic support member is constituted by a coil spring.
【The invention's effect】
[0013]
In the present invention, the following effects can be obtained by adopting such a configuration.
[0014]
(A) In the ultrasonic welding apparatus according to the first invention of the present application, the abutting portion between the resin-made first welding member and the second welding member, which are arranged to collide with each other, is appropriately melted by ultrasonic vibration. A horn that receives ultrasonic waves from an oscillator and ultrasonically vibrates in its axial direction and has a tip surface positioned at one end in the axial direction pressed against the abutting portion; A cylindrical deformation restricting member that is inserted and disposed so as to be relatively movable in the axial direction with a minute gap outside the outer peripheral surface, and is disposed between the horn and the deformation restricting member so that the deformation restricting member is attached to the horn. On the other hand, an elastic support member is provided which is elastically supported in the axial direction.
[0015]
According to the ultrasonic welding apparatus of the present invention, the first welding member and the second welding are arranged such that the tip surfaces of the horn are abutted against each other while being ultrasonically vibrated in the axial direction by the ultrasonic wave from the oscillator. By pressing against the part corresponding to the abutting part with the member from the surface side, each welding member is appropriately melted by the frictional heat accompanying ultrasonic vibration, and each welding member is welded and joined by the molten resin part Is done. In this case, the horn moderately sinks into each welding member while extruding the molten resin to the surroundings as the resin melts, but from the surface of each welding member out of the molten resin extruded by the horn. The molten resin that moves in the bulging direction is elastically supported by the horn and is restricted from moving in the bulging direction by the deformation regulating member that is hardly affected by the ultrasonic vibration on the horn side. It is cooled and solidified at an early stage by the contact. For this reason, in a state where the horn is removed from the side of each welding member after completion of the ultrasonic welding process, the indentation by the horn remains only at the contact portion of the horn, and the upward direction from the surface of each welding member. There will be no burrs protruding in a cylindrical shape.
[0016]
Therefore, according to the ultrasonic welding apparatus of the present invention, the first welding member and the second welding member can be welded and joined without generating burrs at these welded portions, for example, burrs are generated. Compared with the case where the conventional ultrasonic welding apparatus is used, the number of work steps in the entire welding work can be reduced by the amount that the burr cutting work after the welding process becomes unnecessary.
[0017]
(B) According to the ultrasonic welding apparatus according to the second invention of the present application, in the ultrasonic welding apparatus according to the first invention, the deformation restricting member has a low fusion action with the molten resin and is moderate. Because it is composed of wood or mica with heat transfer properties, it has good pressing action of the molten resin to be raised and solidification promotion by cooling, and can more reliably prevent the generation of burrs due to the molten resin. It is.
[0018]
(C) According to the ultrasonic welding apparatus according to the third invention of the present application, in the ultrasonic welding apparatus according to the first or second invention, the elastic support member is constituted by a coil spring. The vibration transmission preventing action between the horn and the deformation restricting member is surely ensured, and the melting action of the resin due to the vibration of the deformation restricting member is surely prevented. The pressing action by the deformation restricting member is adjusted to an appropriate state, and as a synergistic action thereof, the prevention of burrs due to the molten resin is further ensured.
DETAILED DESCRIPTION OF THE INVENTION
[0019]
Hereinafter, the present invention will be specifically described based on embodiments shown in the accompanying drawings.
In FIG. 1, a hollow blade 10 for a blower fan is shown as an example of an article to be joined using an ultrasonic welding apparatus 1 to be described later according to the present invention. A plurality of the hollow blades 10 are attached to the outer periphery of the boss 9 at a predetermined pitch to constitute a blower fan. As shown in FIGS. 1 and 2, the first blade body 11 and the second blade described below are used. The united structure with the body 12 is used.
[0020]
The first wing body 11 corresponds to a “first welding member” in the claims, and is formed in advance by molding using a low melting point / low viscosity resin such as polypropylene. . The first wing body 11 has a substantially trapezoidal planar shape, and includes a recessed portion 14 that is recessed from the surface 11a to a predetermined depth on the surface 11a side. Further, on the outer peripheral edge portion of the recessed portion 14, a shelf surface 16 provided at a depth position substantially matching a thickness dimension of the second wing body 12 described below, and a surface from the outer peripheral side of the shelf surface 16 are provided. An inner peripheral wall surface 17 that rises toward 11a is formed.
[0021]
The second wing body 12 corresponds to a “second welding member” in the claims, and, like the first wing body 11, uses a low melting point / low viscosity resin such as polypropylene. Thus, it is previously formed by molding. The second wing body 12 is fitted and arranged so as to close the recessed portion 14 of the first wing body 11 and substantially matches the planar shape of the recessed portion 14. It is a plate-like body having a planar shape.
[0022]
The first wing body 11 and the second wing body 12 have the back outer peripheral portion 12b of the second wing body 12 placed on the shelf surface 16 of the recessed portion 14 in the first wing body 11, and the first wing body 11 and the second wing body 12. The inner peripheral wall surface 17 of the first wing body 11 and the outer peripheral wall surface 18 of the second wing body 12 are fitted and arranged with a predetermined gap 19 between them. In the fitting arrangement state of the first wing body 11 and the second wing body 12, the space portion 13 is formed at a position corresponding to the concave portion 14.
[0023]
Then, in a state where the first wing body 11 and the second wing body 12 are fitted to each other, each welding joint 15, 15,... Shown in FIG. As shown in FIG. 5, a single hollow wing 10 is obtained by welding and joining these two at a plurality of positions (seven locations in this embodiment) along the outer periphery of the second wing body 12. Is.
[0024]
As shown in FIG. 3, the ultrasonic welding apparatus 1 includes an oscillator 3 that generates ultrasonic vibrations, and a horn 4 that is attached to the oscillator 3 and that receives ultrasonic vibrations from the oscillator 3 and vibrates ultrasonically in its axial direction. And a controller 5 that controls the operation of the welding head unit 2, and performs a welding operation in response to an operation of the foot switch 8 by an operator.
[0025]
Further, the horn 4 is provided with a deformation restricting member 6 in a state of being fitted to the outer peripheral side of the tip portion. The deformation restricting member 6 is formed of a wooden short cylinder, has a minute space between its inner peripheral surface and the outer peripheral surface 4 b of the horn 4, and its axial direction along the outer peripheral surface 4 b of the horn 4. It can be relatively moved in the direction of the arrow, and is elastically supported on the horn 4 side by a coil spring 7 (corresponding to an “elastic support member” in the claims) attached to the horn 4. . Accordingly, the deformation restricting member 6 is held as stationary as possible regardless of the ultrasonic vibration of the horn 4 by the vibration absorbing action of the coil spring 7.
[0026]
In the state where the deformation restricting member 6 is supported by the coil spring 7 in the natural state (the state shown in FIG. 3), the front end surface 6 a is larger than the front end surface 4 a of the horn 4 by a predetermined dimension “S”. The mounting position is set relative to the horn 4 so as to move backward. The dimension “S” is set to a dimension that is slightly smaller than the amount of depression of the horn 4 with respect to the surfaces 11 a and 12 a of the blade bodies 11 and 12.
[0027]
Next, a working state in the case where the blade bodies 11 and 12 are welded and joined using the ultrasonic welding apparatus 1 will be described.
First, as shown in FIG. 3, the ultrasonic welding apparatus from the upper surface side to the position corresponding to the gap 19 on the surface 11a, 12a side of the blade bodies 11, 12 that are brought into contact with each other in an appropriate state. 1 of the above horns 4 are arranged oppositely. Then, the horn 4 is lowered while being oscillated ultrasonically by the oscillator 3, and the tip surface 4a is brought into contact with the surfaces 11a and 12a of the wing bodies 11 and 12 with a predetermined pressing force.
[0028]
Then, as shown in FIG. 4, the parts that are in contact with each other, that is, between the shelf surface 16 of the first wing body 11 and the rear outer peripheral portion 12 b of the second wing body 12, and the wing bodies 11, Friction heat is generated between the surfaces 11a and 12a of the horn 12 and the front end surface 4a of the horn 4, and a part of each of the wing bodies 11 and 12 is melted by receiving the generated frictional heat in each portion. To do.
[0029]
And between the shelf surface 16 of the said 1st wing | blade body 11 and the back surface outer peripheral part 12b of the said 2nd wing | blade body 12, these both are welded and joined by the molten resin produced between these.
[0030]
On the other hand, between the surfaces 11a, 12a of the wing bodies 11, 12 and the front end surface 4a of the horn 4, the front end surface 4a is gradually formed by the pressing force applied to the horn 4 as the resin melts. It is pushed into the surfaces 11a and 2a. In this case, the molten resin in the vicinity of the front end surface 4 a of the horn 4 is subjected to an action of being pushed out to the outer peripheral side of the horn 4 as the horn 4 is immersed.
[0031]
However, as the horn 4 is immersed in the surfaces 11a and 12a of the wing bodies 11 and 12, the deformation restricting member 6 disposed outside the horn 4 is also lowered, and the tip surface 6a is It is pressed against the surfaces 11a and 12a. In addition, in this case, the deformation regulating member 6 is elastically supported by the coil spring 7 so that it hardly vibrates despite the ultrasonic vibration of the horn 4 and is applied to the distal end surface 6a of the deformation regulating member 6. The contacting resin portion does not generate a melting action due to frictional heat, and conversely, it contacts the molten resin by the ultrasonic vibration of the horn 4 to cool and solidify the resin. As a synergistic action, the bulging action of the molten resin from the surfaces 11a and 12a is surely prevented regardless of the horn 4 being immersed in the surfaces 11a and 12a of the blades 11 and 12, respectively. become.
[0032]
Therefore, all of the molten resin subjected to the pushing action by the immersion of the horn 4 is filled in the gap 19 (see FIG. 3) between the first wing body 11 and the second wing body 12, and FIG. As shown in the figure, the melted resin portion extends from the portion corresponding to the shelf surface 16 to the portion corresponding to the tip portion of the horn 4 in the immersive state at the joint portion of the first wing body 11 and the second wing body 12. 20 is formed, and the first wing body 11 and the second wing body 12 are joined by the molten resin portion 20.
[0033]
When the horn 4 is detached from the hollow blade 10 side at the time of completion of the welding and joining, as shown in FIG. 2, the welding joint 15 on the surface side of the hollow blade 10 is connected to the upper end of the molten resin portion 20. Only the indentation 21 formed by the horn 4 remains, and a conventional burr (see FIG. 7) does not occur.
[0034]
Thus, according to the ultrasonic welding equipment of this embodiment, the fusion bonded parts 15 and 15, the ..., burrs which requires post-resection work does not occur, the ablation processing is omitted as possible minute, as compared with the case of the conventional ultrasonic welding equipment, in which by reduced number of working steps in welding operation it is possible to achieve a cost reduction of the operation cost.
[0035]
In particular, when applied to the manufacture of the hollow blade 10 constituting the blower fan as in this embodiment, only the welding operation of the first blade body 11 and the second blade body 12 (in other words, burr cutting). Even without performing the post-work), it is possible to easily obtain the burr-free hollow blade 10 that causes wind noise, so that both the function maintenance and cost reduction of the blower fan can be achieved. .
[0036]
In addition, in this embodiment, although the case where the said ultrasonic welding apparatus 1 was used for manufacture of the said hollow blade 10 was demonstrated, the ultrasonic welding method and ultrasonic welding apparatus of this invention are limited to the manufacturing object. However, the present invention can be widely applied to welding and bonding between resin members.
[0037]
Further, in this embodiment, the deformation restricting member 6 is made of wood, but the deformation restricting member 6 may be any member as long as it has little fusion action with the molten resin and has an appropriate heat transfer property. In addition to wood, “mica” is considered as a material having such properties.
[Brief description of the drawings]
1 is a plan view of a hollow blade manufactured by using an ultrasonic solvent wearing location according to the present invention.
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG.
FIG. 3 is an explanatory view of a method of using the ultrasonic welding apparatus according to the present invention.
4 is a state change diagram of FIG. 3. FIG.
FIG. 5 is an explanatory diagram of a method of using a conventional ultrasonic welding apparatus.
6 is a state change diagram of FIG. 5. FIG.
7 is a cross-sectional view of the conventional joining using ultrasound soluble worn location the welded joint portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 is ultrasonic welding apparatus, 2 is a welding head part, 3 is an oscillator, 4 is a horn, 5 is a controller, 6 is a deformation control member, 7 is a coil spring, 8 is a foot switch, 10 is a hollow wing, 11 is the first 1 wing body, 12 a second wing body, 13 a space portion, 14 a recessed portion, 15 a welded joint, 16 a shelf surface, 17 an inner peripheral wall surface, 18 an outer peripheral wall surface, 19 a gap, and 20 a melt The resin part 21 is an indentation.

Claims (3)

An ultrasonic welding apparatus for melting and welding the abutting portions of the first welding member and the second welding member made of resin which are arranged to collide with each other by ultrasonic vibration,
A horn that receives ultrasonic waves from an oscillator and ultrasonically vibrates in the axial direction and a tip surface located at one end in the axial direction is pressed against the abutting portion;
A cylindrical deformation regulating member that is fitted and arranged so as to be relatively movable in the axial direction with a minute gap outside the outer peripheral surface of the horn
An ultrasonic welding apparatus comprising: an elastic support member disposed between the horn and the deformation restricting member and elastically supporting the deformation restricting member in the axial direction with respect to the horn. In claim 1 ,
The ultrasonic welding apparatus, wherein the deformation regulating member is made of wood or mica. In claim 1 or 2 ,
The ultrasonic welding apparatus, wherein the elastic support member is constituted by a coil spring.

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