JPH0579220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joining method for joining small parts to synthetic resin products.

(Prior Art) Conventionally, for example, in the case of an automobile side visor, a joining method involves joining a locking tool for attaching the side visor to the automobile side to a synthetic resin side visor main body having an eaves portion that covers the upper part of a side door. Alternatively, the locking tool may be attached to the synthetic resin side visor body using an adhesive or double-sided tape, or hot melt adhesive, or the locking tool may be attached to the side visor body by riveting or eyelet metal fittings. This is done using a fastening method.

(Problems to be Solved by the Invention) However, according to the above-described conventional bonding methods using adhesives or double-sided tape, not only is the adhesive force between the side visor body and the locking tool weak, but also the bonding force is weak due to heat or sudden impact. There is a problem that the adhesive easily comes off when heat is added to the side visor body, and when hot melt adhesive is used, there is a problem that the side visor main body made of a synthetic resin material loses its shape during heat welding. According to the joining method by caulking the rivets and eyelet metal fittings, it is necessary to specially form mounting holes on the mounting surfaces of the side visor body and the locking tool, and moreover, when crimping the rivets and eyelet metal fittings, it is necessary to form mounting holes respectively. There has been a problem in that the side visor body and the locking tool crack due to processing stress.

An object of the present invention is to use a bonded body made of a synthetic resin material capable of holding small parts, and to improve the bonding surface of the bonded body to the synthetic resin product, thereby preventing the bonded body from cracking the synthetic resin product. The object of the present invention is to provide a joining method that can securely and firmly weld the small parts to the synthetic resin product without losing its shape.

(Means for Solving the Problems) Accordingly, the present invention provides a joining method for joining a small article to a synthetic resin product. A joined body 5 having a joint portion 53 having a large number of protrusions 52 protruding from the joint surface is formed of a synthetic resin material, and the holding portion 5 of this joined body 5 is
1 holds the small part 3, the protrusion 52 on the joint surface is brought into contact with the attachment site of the synthetic resin product 2, and then the joined body 5 is heated by a heating means to melt the protrusion 52. Then, the joined body 5 is integrated with the synthetic resin product 2, and the small parts 3 are integrated.
is fixed to the synthetic resin product 2.

(Function) By the above joining method, the small part 3 is joined to the synthetic resin product 2 by welding the joined body 5 to the synthetic resin product 2, and the joined body holds the small part 3 during the joining. By locally heating and melting only a large number of protrusions 52 protruding from the joint surfaces of the parts 5 and 5, the joined body 5 and the synthetic resin product 2 are reliably and firmly integrated without deforming or cracking during welding. This allows the small part 3 to be firmly fixed to the synthetic resin product 2.

(Example) Hereinafter, an example of the joining method of the present invention will be described based on the drawings.

The drawings show a side visor for an automobile manufactured by the joining method of the present invention, and the embodiment shown in FIGS. This is a side door attachment type automobile side visor that is used by being attached to a window frame 10, and its basic structure includes an eave part 21 that runs along the window frame 10, and an ear that is inserted into the glass groove 11 of the window frame 10. The ear part 22 of the side visor main body (synthetic resin product) 2 made of acrylic resin has a locking metal fitting (mainly a locking metal fitting) which is held in the latch channel 12 made of rubber or felt in the glass groove 11. It is made by attaching small parts) 3.

The locking fitting 3 includes a mounting portion 31 that is attached to the ear portion 22 and a locking portion 32 that locks to the launch channel 12.

Further, numeral 4 in FIG. 1 is a window glass.

However, the synthetic resin side visor main body 2
and the locking metal fitting 3 are joined by the following joining method.

First, the holding part 51 that holds the locking metal fitting 3
A joined body 5 having a joint surface facing the side visor body 2 and a joint portion 53 having a large number of protrusions 52 protruding from the joint surface is formed of the same acrylic resin as the side visor body 2.

Specifically, as shown in FIG.
For example, a rectangular through hole 31 is provided in the center of the mounting portion 31 of the
a, and a joined body 5 including a joint part 53 that can be inserted into the through hole 31a and a holding part 51 made of a flange larger than the outer circumference of the through hole 31a. By inserting the joint portion 53 into the through hole 31a, the holding portion 51
This is done to hold the locking metal fitting 3.

As shown in FIG. 3, a large number of pyramid-shaped or hemispherical protrusions 52 are provided on the joint surface of the distal end of the joint portion 53, and when the joint portion 53 is inserted into the through hole 31a, the surface of the joint surface is The protrusion 52 is formed to protrude outward from the through hole 31.

After the locking fitting 3 is held in the holding part 51 of the joined body 5 and the protrusion 52 on the joint surface is brought into contact with the attachment part of the side visor main body 2, as shown in FIG. The joined body 5 and the side visor body 2 are held between the sonic poles and applied with ultrasonic waves while being pressurized, and the vibration heats and melts only the protrusion 52 that makes point contact with the mounting surface of the side visor body 2, thereby completing the joining process. The body 5 is integrated with the side visor 2, and the locking metal fittings 3 are fixed to the side visor main body 2.

According to such a joining method, the projections 52 that make point contact with the mounting portion of the side visor body 2 are locally heated and melted by the vibrations caused by the ultrasonic waves, so that the projections 52 other than the projections 52 of the side visor body 2 and the joined body 5 are heated locally and melted. This allows the parts to be reliably and firmly welded together without losing their shape or cracking. Furthermore, unlike when using rivets or eyelet metal fittings, the heads of rivets and eyelet metal fittings do not protrude from the inner side of the ears 22 of the side visor main body 2, so that the upper edge of the window glass 4 This allows the window glass to open and close smoothly without causing any noise or scratches on the window glass.

Further, as a holding means for the locking metal fitting 3 by the joined body 5, as shown in FIG.
On the other hand, the notches 31b and 3 are formed at both ends.
A joined body 5 is formed in which joint parts 53, 53 that can be inserted into 1b protrude, and both joint parts 53, 53 of the joined body 5 are formed.
53 through both the notches 31b, 31b, the locking metal fitting 3 may be held between both the joint parts 53, 53, or as shown in FIG. The attachment 31 may be inserted and integrated when molding the joined body 5.

Further, the shapes of the through hole 31a of the mounting portion 31 and the joint portion 53 include, for example, a circular shape, an elliptical shape, a cross shape, as shown in FIGS. 9 to 13,
Triangular shape, other irregular shapes, or first
As shown in FIGS. 4 to 16, the shape may be a double circular shape, a double parallelepiped shape, or the like.

Further, in the embodiment, the shape of the protrusion 52 provided on the joined body 5 is pyramidal, but it may also be shaped into a spherical shape, a conical shape, or a conical shape as shown in FIGS.
The shape is not limited to any shape as long as the tip area is small, such as a cylindrical shape or various wave shapes as shown in FIG.

Incidentally, in FIG. 10, reference numeral 54 denotes an engaging protrusion provided on the outer surface of the joined body 5 to engage with the launch channel 12.

In the above embodiment, the side visor main body 2 and the joined body 5 are molded from acrylic resin to ensure the fusion of the two and the holding strength of the locking fitting 3. As long as it is a combination of resins that are of the same type and have good fusibility, that is, a combination of synthetic resin materials that can ensure fusibility and retention strength, it may be a combination of other synthetic resin materials, such as acrylic resin. It may be a combination of a side visor main body and a joined body made of polycarbonate.

Furthermore, in the above-mentioned embodiments, as an example of the use of the joining method of the present invention, an explanation has been given of the method used for attaching the side visor main body 2 and the locking fitting 5 in a side visor for an automobile. , electronic components,
Of course, it can be widely applied to attaching small metal parts or small parts made of different synthetic resin to synthetic resin products in all fields such as home appliances, cameras, aircraft, and automobiles.

(Effects of the Invention) As explained above, according to the joining method of the present invention,
When joining the small component 3 to the synthetic resin product 2, a bonded body 5 made of a synthetic resin material that holds the small component 3 is used, and the synthetic resin product 2 of the bonded body 5 is
By welding to the synthetic resin product 2, the small part 3 can be fixed to the synthetic resin product 2 through the bonded body 5, regardless of its material, and in addition, the bonded body 5 can be welded to the synthetic resin product 2. When welding,
A large number of protrusions that are easily melted by heating are integrally provided on the joint surface of the joined body 5 to the synthetic resin product 2, and after the protrusions 52 are brought into contact with the attachment site of the synthetic resin product 2, the Since the joined body 5 is heated by a heating means to locally heat and melt only the projections 52, and the joined body 5 is integrated with the synthetic resin product 2, the synthetic resin product 2 and the joined body are integrated. The body 5 can be reliably and firmly integrated without deforming or cracking during the welding, and the small part 5 can be firmly fixed to the synthetic resin product 2.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted vertical cross-sectional view of an automobile side visor joined by the joining method of the present invention, FIG. 2 is a perspective view of the locking metal fittings and the joined body, and FIG. 3 is an enlarged explanatory view of the protruding portion of the joined body. Fig. 4 is a cross-sectional view showing the state in which the protrusion of the joint holding the locking metal fitting is in contact with the side visor body, Fig. 5 is a partially enlarged view of the automobile side visor, and Fig. 6 shows the entire side visor. A side view, FIGS. 7 and 8 are perspective views showing other embodiments of the locking fitting and the joint;
9 to 16 are perspective views showing another embodiment of the joined body, and FIG. 17 is an explanatory view showing another embodiment of the protrusion provided on the joined body. 2...Synthetic resin product (side visor body),
3...Small parts (locking metal fittings), 5...Joint body, 5
1...Holding part, 52...Protrusion, 53...Joint part.

Claims (1)

[Claims] 1 A joining method for joining small parts to a synthetic resin product, which includes a holding part 51 that holds the small part 3;
A joint portion 53 having a joint surface facing the synthetic resin product 2 and having a large number of protrusions 52 protruding from the joint surface.
A joined body 5 is formed of a synthetic resin material, and while the small part 3 is held in the holding portion 51 of the joined body 5, the protrusion 52 on the joint surface is connected to the attachment portion of the synthetic resin product 2. After contacting
The bonded body 5 is heated by a heating means to melt the projections 52, the bonded body 5 is integrated with the synthetic resin product 2, and the small parts 3 are fixed to the synthetic resin product 2. A joining method for joining small parts to synthetic resin products.