JPS60230830A - High frequency fusion bonding method of beading - Google Patents

Abstract

PURPOSE:To prevent the collapse of a shape or deformation at the time of fusion bonding by locally heating and melting only the vicinity of the contact part with a material to be adhered, in performing the fusion bonding of beading and the material to be adhered in a pressure contact state, by supplying a high frequency current to the beading from the direction crossing the pressure contact direction. CONSTITUTION:Beading 7 is housed in the recessed part of a jig 10 and the vicinity of the contact part 12 with a material 6 to be adhered is subsequently grasped from left and right directions by electrodes 8, 9. When a high frequency current is supplied between electrodes 8, 9 in this state, said high frequency current is flowed through the vicinity of the contact part 12 of the beading 7 contacted with the material 6 to be adhered in almost parallel to the surface of said material 6 to be adhered. As a result, only the softened and melted contact part 12 is locally deformed and fusion bonded to the material 6 to be adhered and the generation of an inferior product due to deformation at the time of fusion bonding bonding can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for attaching a bead to an adherend made of a skin such as a seat of a vehicle or furniture, a bag, or an interior material.

Yoshihisa Hito: Traditionally, the beading is applied to the surface of the adherend, such as the seat skin.
Welding is performed using high frequency. This is shown in FIGS. 1 and 2. As shown in FIG. 1, a bead 3 and an adherend 4 are sandwiched between an upper electrode 1 and a lower electrode 2.
A high frequency current is passed between both electrodes. Then, a high frequency current flows between the bead 3 and the adherend 4, the current-carrying part is heated and melted, and as a result, the two are welded together.

In this welding method, the high frequency current flows over a wide range of the bead 3, so the entire bead 3 is melted and softened. Moreover, the bead 3 is connected to the upper electrode l at the same time as the high frequency current is applied.
Since the bead 3 is pressed against the adherend 4, it is crushed as shown in FIG. 2 and is welded in an out-of-shape state. In addition, a large amount of rupture 3' of the welded portion occurs.

Therefore, it is not possible to finish the product with the intended bead shape, resulting in a product that is in a bad shape that is contrary to the design intention due to deformation or fringing, which may damage the product appearance or, in some cases, There was a problem in that the product could become defective.

The object of the present invention is to prevent deformation during welding caused by the deformation of the bead edge or a large amount of flakes.

゛The method of the present invention to solve the above problem is to apply a high frequency current to the bead edge from a direction intersecting with the welding direction when the bead edge and the adherend are welded by pressure contact. This method is characterized in that only the vicinity of the contact portion with the adherend is locally heated and melted, and the bead is welded to the adherend in this state.

--1 According to the method of the present invention, the high frequency current during welding is
It flows approximately parallel to the surface of the adherend in a direction intersecting with the pressing direction, that is, near the contact area of the bead with the adherend, and only this part is locally heated and melted. Therefore, welding is performed with a relatively small melting range and melting amount.

The present invention will now be described in detail with reference to FIGS. 3 to 5.

FIG. 3 shows the welding device, in which the adherend 6 is placed under the mold 5.
, the bead 7 is placed under it, and the bead 7 is fixed on the jig 10. A recess in which a part of the bead 7 can be accommodated is previously formed on the upper surface of the jig 10, and the bead 7 is fitted into this recess. Furthermore, the jig 10 is fixed on the base 11.

Next, the vicinity of the contact portion 12 of the bead 7 with the adherend 6 is held between the electrodes 8.9 from the left and right directions. The electrode 8.9 is an electrode that is divided into left and right parts and is slidable in the left and right direction. The divided ends can come into contact with both sides of the bead 7 exposed from the recess. The other ends are each connected to a transmitter number power source. In this state, Takaoka is placed between electrodes 8 and 9.

When a wave current is applied, the high-frequency current flows approximately parallel to the surface of the adherend 6 near the contact portion 12 of the bead 7 that is in contact with the adherend 6. As a result, as shown in FIG. 4, only the contact area 12 of the bead 7 is heated and softened and melted. At the same time, if the press die 5 is pushed down in the direction A in Fig. 3, the adherend 6
is pressed against the bead 7. Note that the relationship between the bead 7 and the adherend 6 in this embodiment may be upside down. In this case, the bead is pressed against the adherend. Alternatively, the pressing die 5 and the jig 10 (or the base 11) may be made movable and both may be pressed at the same time.

During this pressure welding, as shown in FIG. 5, only the softened and melted contact portion 12, ie, a portion of the bead 7, is locally deformed and is welded to the adherend 6. Then the bead 7
By sliding the electrode 8.9 and opening it in the left-right direction (in the direction of arrow B) in FIG. 3 after the adherend 6 has been welded, the product whose bead 7 is welded to the adherend 6 can be easily taken out. I can do it.

As a result, the appearance of the bead 7 is hardly deformed, and a product that meets the original design intention can be obtained. In particular, since the external surface 14 side is not melted, it is not deformed in any way, so even if the surface is decorated with a pattern, for example, it will not disappear. Further, since the resin melts within a relatively narrow range, the generation of paris is also relatively small.

Furthermore, in this example, a part of the bead is melted and pressed directly onto the surface of the adherend, so even if the surface of the adherend is flat, the bead can be placed on the flat surface. Can be freely welded into any shape.

Therefore, the degree of freedom in design is greatly increased, which is advantageous.

In the above example, only the contact area of the bead is softened and melted, but depending on the voltage, materials used, pressure welding conditions, etc., the contact area of the adherend that comes into contact with the bead may be subjected to primary heating or heating by high-frequency current. Secondary heating of the molten contact area may cause it to soften and melt. The present invention does not exclude such a case, but in this case, the welding strength increases and no deformation that impairs the appearance occurs, so it is rather welcome.

Furthermore, the bead according to the present invention is not limited to a circular cross-sectional shape, but can have various irregular cross-sections such as a square shape, and is meant to include all decorative members having such a cross-section.

Of course, it is also possible to use a bead with a core material embedded therein as appropriate.

1. As shown in Section F, according to the present invention, the bead edge can be welded only by local deformation that does not affect the appearance.

Therefore, it is possible to prevent deformation during welding that impairs the appearance of the product, to obtain a product with an appearance that meets the original design intention, and to prevent product defects due to deformation during welding.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of the conventional example, Figure 3 [4 is a cross-sectional view of the present example, Figure 4 is a cross-sectional view showing the state before welding in this example, and Figure 85 is an actual example. FIG. 3 is a cross-sectional view showing the state after welding. [Explanation of symbols] 5... Embossing die 6... Stone object 6 7... Bead 8... Electrode 9... Electrode 10--Jig 11... Base 12... Contact portion patent Applicant: Quinlight Denshi Seicho Co., Ltd. Patent applicant: Tokyo Seat Co., Ltd. Masato Toji (
8950) Patent Attorney Kiyoshi Komatsu Mitsuma Figure 1 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] In a method of welding the bead to the adherend by stacking the adherend and the bead, pressing at least one of them against the other, and applying a high-frequency current, the bead A method for high-frequency welding of bead edges, which is characterized in that a high-frequency current is applied to the material to locally heat and melt only the vicinity of the contact area with the adherend, thereby welding the bead to the adherend.