JP3313154B2 - Composite hoop and hoop molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite hoop in which two hoops are combined and a hoop molding method using the same.
The hoop molding can be performed even in an insert molded product in which the hoop molding cannot be conventionally performed.

[0002]

2. Description of the Related Art Conventionally, hoops (2
1) has a pair of small holes (feed holes) (22) for alignment and feeding on both sides as shown in FIG. 5, and a part (23) serving as an insert of a molded product is continuously provided between them. Is what it is.
Unnecessary portions such as both side portions are cut out of the hoop by punching after molding, and an insert molded product as shown in FIG. 6 is molded. In FIG. 6, (31) is a molded product, (32)
Indicates an insert. Therefore, for example, it has been difficult to obtain a molded product using two different materials as inserts by hoop molding. In addition, it was difficult to form a hoop in the same manner depending on the shape of the insert even with the same kind of material.

[0003]

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to make it possible to easily form a hoop even in a molded article having the above-described insert, which has been difficult to form in the past. And

[0004]

SUMMARY OF THE INVENTION The present invention has a series of small holes for alignment and feeding on one side and a series of small holes on the other side .
A series of protrusions to be used as inserts for molded products
A composite hoop having the small holes on both sides, wherein two hoops having a series of convex lines for fixing the hoops are directly fixed between the convex lines of both hoops by caulking or the like. In addition, the composite hoop
Forming a molded article at the predetermined position as a sheet,
And unnecessary portions of the composite hoop, including the fixed portion of the ridge,
A method for forming a hoop, comprising a step of cutting off .

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of an insert molded product obtained by the present invention, wherein (11) shows a molded product, (12) and (13) show inserts, respectively, and one of the inserts (13) has one end (inside the molded product). Side) is welded with a circular part (14). A hoop for forming a hoop of the insert molded product and a forming method using the hoop will be described as an example.

FIG. 2A shows a first hoop (1), which is made of a metal plate. The hoop band (2) has a series of small holes (3) (hereinafter referred to as "feed holes") for alignment and feeding. The projections (4) and the projections (5) for joining with the second hoop are alternately and integrally formed, and a circular part (14) is welded to the tip of the projection (4). ing. Such a hoop can be easily obtained by punching a metal plate with a press or the like and then welding a circular component (14) to the tip of the projection (4). FIG. 2B shows a second hoop (6), which is made of a metal different from that of the first hoop. The hoop strip (7) consists of a series of perforations (8)
On one side, a series of convex portions (9) to be an insert of a molded product by molding and convex ridges (10) for joining with the first hoop are alternately and integrally formed. .

Next, the first hoop and the second hoop are fixed by joining the ridges (5) and (10) by a method such as caulking. FIG. 3 shows a composite hoop obtained in this manner, in which the ridge (5) of the first hoop (1) and the second hoop (5) are used.
Of the hoop (2) is fixed by caulking. And convex parts (4), (9) which become inserts of the molded product
Are facing each other at a slight interval. The composite hoop is
Hoop molding is performed as usual by injection molding or the like. Then, the unnecessary parts of the composite hoop (band-like parts (2), (7), ridges)
(5), (10) etc.) are removed by punching,
By performing finishing such as separation of the gate and the like, the insert molded product shown in FIG. 1 is obtained. In addition, as shown in FIG. 4, the fixing ridge (17) for fixing the first hoop (15) and / or the second hoop (16).
And or (18) also, the convex part (19) which becomes the insert of the molded product
And / or (20) can be provided, and such a case is also included in the present invention.

[0008]

The composite hoop of the present invention can be easily manufactured mechanically. The hoop molding method using the composite hoop is used in a hoop molding of a molded product using two different materials as inserts, or a hoop molding of an insert having a special shape, which has been difficult in the past.
This is an extremely effective molding method, and further expands the applicable range of hoop molding. The forming method of the present invention is suitable for forming electric and electronic parts having a special metal part shape such as a capacitor.

[Brief description of the drawings]

FIG. 1 is an example of an insert molded product obtained by the hoop molding of the present invention, wherein (a) is a plan view, (b) is an AA cross-sectional view of (a), and (c) is B of (b). -B sectional drawing.

FIG. 2 is a plan view of a hoop (one example) used in the present invention,
(a) is the first hoop, (b) is the second hoop.

FIG. 3 is a plan view of a composite hoop (one example) of the present invention.

FIG. 4 is a plan view of a composite hoop (another example) of the present invention.

FIG. 5 is an example of an insert molded product obtained by conventional hoop molding, wherein (a) is a plan view and (b) is a side view.

FIG. 6 is a plan view of a hoop (one example) used in conventional hoop molding.

[Explanation of symbols]

 1,15 First hoop 2,7 Strip 3,8 Feed hole 4,9,17,18 Convex part 5,10,19,20 Convex ridge 6,16 Second hoop 11 Molded product 12,13 Insert 14 Circular part 21 Hoop 22 Sprocket hole 23 Insert part 31 Molded product 32 Insert

Claims (2)

(57) [Claims] 1. A series of small holes for alignment and feeding on one side and a series of inserts on the other
A series of ridges to secure the other hoops to the ridges and
The two rows of the hoop having, characterized by comprising fixed directly by the ridges of both the hoop by caulking or the like, a composite hoop with the small holes on both sides. 2. The method according to claim 1 , further comprising a step of forming a molded article at a predetermined position using the composite hoop of claim 1 as an insert, and a step of cutting off an unnecessary portion of the composite hoop including the fixing portion of the ridge. Characterized hoop molding method.