JP2006347147A - Molding method for extrusion-molded article of synthetic resin core material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extrusion-molded article for which a core body being used for being pinched-held at the opening section of a car body such as a door of an automobile, a trunk, and a window is additionally provided. <P>SOLUTION: As shown in the figure 1, in this molded article, with respect to the synthetic resin core material 2 which has been extrusion-molded so as to have an approximately U-shaped cross section by a first extrusion-molding machine and a first die, various kinds of cut sections are formed on the side edges of the resin core material by a blanking machine after being cooled. Then, after a covering body is heat-welded on the periphery of the synthetic resin core material 2 by a second extrusion-molding machine, a wide gap section facing a fixed protuberance piece 7 is provided on the internal side of the covering body, and a deformable holding piece 8 is formed. Then, after bending the deformable holding piece 8 downward or upward in such a manner that a narrow gap section 10 is formed to the fixed protuberance piece 7 by a jig when the deformable holding piece is under a softened state after having traveled in a second die, cool-molding is performed. Also, the fitting installation of the jig is suitably changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a synthetic resin core material used for clamping and holding portions of respective openings such as trims, weather strips, window moldings and the like used for flanges set in vehicle body openings such as automobile doors, trunks, and windows. The present invention relates to a method for molding an extruded product.

Conventionally, a metal core material is generally used as a core material for trims, weather strips, wind moldings, and the like used for vehicle body openings of this type of automobile. The metal core material as the molding method is formed by punching out cut portions of various shapes with a flat cross section, and bending the flat plate core material with the cut portion into a substantially U-shaped cross section by extrusion molding. It is manufactured.
However, due to the recent increase in environmental problems, there is a demand for changing the material to a hard synthetic resin in order to reduce the weight and recycle the metal core material. However, when a hard synthetic resin core material is manufactured from a flat plate in the same manner as a metal core material, it is very difficult to bend it into a substantially U-shaped cross section. A large number of excised parts are formed by a punching machine to form a synthetic resin core material with excised parts. Thereafter, a plurality of corresponding holding pieces for pressure welding for attaching a covering to the outer periphery of the synthetic resin core material having a substantially U-shaped cross section by extrusion molding and holding the flange of the vehicle body opening of the automobile on the inner surface side Is formed. However, in order to improve the holding property to be sandwiched with the flange of the vehicle body opening of the automobile, it is necessary to narrow the gap between the opposing holding pieces, and the desired shape on the inner peripheral surface of the substantially U-shaped cross section, There is a serious problem that it is technically very difficult to reliably extrude the holding piece in the gap.

  The present invention was invented in order to solve the above-mentioned problems, and it is very important to narrow the gap between the holding pieces that protrude from the inner peripheral surface of the conventional synthetic resin core material having a substantially U-shaped cross section. Since it is difficult, the present invention secures a gap between the holding pieces to a certain extent by extruding the deformation holding piece mold above the normal position inside the die as shown in FIG. After the mold die has withstood the pressure during extrusion molding, the deformed holding piece in the heat softened state is returned to the position of the regular gap by the jig immediately after passing through the die die, and then cooled. To do.

  In the present invention, in order to achieve the above object, a synthetic resin core material of hard synthetic resin is extruded from a first extrusion molding machine into a substantially U-shaped section by a first mold die. After that, the synthetic resin core material passes through the cooling layer while running and forms a cut portion or a cut concave portion on the side by a punching machine, and then enters the second mold die and enters the second extrusion molding machine. The coated body is fused around the synthetic resin core material by the injected soft synthetic resin, and a wide gap portion is provided on the inner side of the coated body at a position facing the fixed projection piece to form a deformation holding piece. Then, after running inside the second die, when the deformation holding piece is in a softened state, the deformation holding piece is folded downward or upward with a jig to form a narrow gap with respect to the fixed projection piece. It cools after bending.

As described above, according to the present invention, it is possible to easily perform difficult work by the molding method using the first mold die, the second mold die, the jig, etc., with good holding ability for holding the flange of the vehicle body opening. Compared to the excellent effect that has been reliably solved and the extrusion molded product using a conventional metal core material, the weight is significantly reduced and the recyclability is excellent. There is also an effect that a very difficult work of bending into a U-shape is unnecessary.
In addition, according to the extrusion molding of the present invention, a convenient effect that can adjust the thickness of the synthetic resin core material having a substantially U-shaped cross section of the molded product as necessary, and various shapes of cuts as required during traveling Since the part or the cut recess is formed, it is very convenient and also has an effect that it can be mounted on a three-dimensional vehicle body.
Furthermore, after the covering was fused around the synthetic resin core material of the molded product body, a deformation holding piece was formed by providing a wide gap portion facing the fixed projection piece inside the covering body. By enlarging the gap in the interior of the mold, it becomes easy to perform extrusion molding and molding, and the die is effectively extruded without any fear of breakage due to pressure.
Then, after traveling inside the die, when the deformation holding piece is in a heat-softened state, it is possible to form a narrow gap portion in a predetermined position with certainty with respect to the fixed projection piece by using a jig. There is an effect that each holding piece can be firmly clamped and fixed to a flange or the like of a vehicle body opening of an automobile or the like.

Synthetic resin provided with a cut portion (17) and a cut recess portion (18) in a molded product body (1) having a substantially U-shaped cross section used for an opening of a vehicle body such as an automobile configured as described above. The cover (3) is heat-sealed around the core (2). As shown in FIG. 1 provided inside the covering (3), the deformation holding piece (8) is bent downward into the gap (10) narrower than the molding holding piece (9) of the wide gap (11). The weather strip and the flange portion of the wind molding are firmly inserted and held in the narrow gap portion (10) formed inside the molded product body (1).
Further, as shown in FIG. 3, the molding holding piece (9) provided in the molded product main body (1) is formed downward at the time of molding, and facilitates molding as a wide gap portion (11). In use, etc., it is bent upward to form a narrow gap (10) as the deformation holding piece (8), and is firmly inserted and held in the flange.

  Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional shape when the molded product body (1) is used, and the molded product body (1) is molded in the longitudinal direction. As shown in FIGS. 7 and 8, the synthetic resin core material (2) extruded from the first extrusion molding machine (21) to the substantially U-shaped cross section by the first mold die (22) 1 It sends to a punching machine (29) through a cooling water layer (23) and a delivery roller (24).

In the punching machine (29), as shown in FIG. 5 and FIG. 6, the synthetic resin core material (2) is alternately or relative to the opposite side sides (5) and (5) except for the head (19). The notches (17) and (17) and the notches (18) and (18) are formed at continuous or discontinuous intervals.
The notches (17) and (17) and the notches (18) and (18) are formed so that the molded product body (1) can be bent freely left and right or upward.

Next, the synthetic resin core material (2) is traveling in the second mold die (26) made of soft synthetic resin injected into the second extrusion molding machine (25) shown in FIGS. The covering (3) is attached to the inner and outer peripheries of the synthetic resin core (2) by heat sealing.
As shown in FIG. 2, the inside of the second mold die (26) at this time is formed with a molding die portion (14) having a substantially U-shaped cross section as a whole. The molding die portion (14) has The deformation holding piece mold portion (15) and the fixed projection mold portion (16) facing the inner surface side are respectively formed. A wide gap portion (11) that is easy to mold is formed between the deformation holding piece mold portion (15) and the fixed projection mold portion (16).

  Next, the cover (3) thermally fused to the inner and outer periphery of the synthetic resin core (2) is integrally provided with a fixed projection piece (7) facing the inner periphery and a deformable deformation holding piece (8). Is formed. The deformation holding piece (8) shows a state in which a narrow gap (10) used when the molded product body (1) is mounted on a flange or the like is formed, and is cured when the second mold die (26) is run. It is shown in FIG. 1, FIG. 3 and FIG. 9 by the tool (28). The shaped holding piece (9) indicated by the dotted line is bent and deformed upward or downward so as to form the narrow gap (10).

  Furthermore, what is shown in FIG. 4 shows a cross section of the second mold die (26), and the molding holding piece (9) having a wide gap (11) shown in FIG. 3 is bent downward and extruded. The mold part (15) for deformation holding pieces in the state is formed.

FIG. 7 shows an embodiment of the manufacturing process of the present invention, and is molded while passing through the inside of the first mold die (22) from the first extrusion molding machine (21) injected with a hard synthetic resin. The synthetic resin core material (2) having a substantially U-shaped cross section passes through the first cooling water tank (23) and the feed roller (24), and then is cut into a predetermined shape by a punching machine (29) (17 ) Or cut recesses (18) are cut at predetermined intervals or alternately, and then the synthetic resin core material (2) enters the second mold die (26) and is injected by the second extruder (25). A plurality of soft fixing resins, wherein the inner and outer periphery of the U-shaped strip of the synthetic resin core material (2) are heat-sealed by the covering body (3), and the opposing fixed projection pieces (7) are provided as necessary. Each of the molded holding pieces (9) to be bent is formed to project.
As shown in FIGS. 2 and 4, the deformation holding piece (8) is fixed in the deformation holding piece mold section (15) by the second mold die (26). 16) with a wide gap (11) secured between them. Thereafter, after passing through the second mold die (26), the jig (28) is molded into a normal position shown in the deformation holding piece (8), and then cooled by the second cooling water tank (27) to be a molded product ( 30).

  Next, the manufacturing method shown in FIG. 8 shows a process in which a jig (28) passing through the second mold die (26) in FIG. 7 is installed at a position adjacent to the second mold die (26). It is a thing. Further, what is shown in FIG. 9 is one in which a cushioning hollow seal (31) to be attached to a part of the outer periphery of the molded product body (1) shown in FIG. 1 is integrally formed.

  Next, the material used by the present invention will be described. As the hard synthetic resin for forming the synthetic resin core material (2) having a U-shaped cross section, an olefin resin such as polypropylene and polyethylene, a styrene resin, a nylon resin, Stiffness and heat resistance of hard synthetic resin that forms synthetic resin core material (2) by mixing inorganic powders such as talc, mica, and glass fiber with polyester resin, polycarbonate resin, etc. or hard synthetic resin thereof In some cases, the coefficient of linear expansion is increased.

Further, as the soft synthetic resin for forming the covering (3), an olefin resin having a hardness of HDA 90 or less (JIS K7215), a styrene resin or a thermoplastic elastomer thereof is used, but vinyl chloride or rubber may be used. is there.
In addition, the soft synthetic resin forming the fixed projection piece (7) and the deformation holding piece (8) for pressure contact is also manufactured by a single extrusion molding machine using the same material as the covering (3), and fixed. When the hardness and type of the material are changed depending on the desired function and quality of the protrusion piece (7) and the deformation holding piece (8), polymerization extrusion molding may be performed by the second and third extruders.

  It is sectional drawing bent by the deformation | transformation holding piece from the shaping | molding holding piece of the dotted line by which extrusion molding of the molded product main body of this invention was carried out.   It is a longitudinal side view of the metal mold | die which similarly extrudes the molded article main body of this invention.   It is the vertical side view which bent and deform | transformed into the deformation | transformation holding | maintenance piece from the shaping | molding holding piece of the dotted line formed by extrusion of the molded product main body of this invention.   It is the vertical side view which similarly formed the metal mold | die for a deformation | transformation holding piece of the metal die | dye of this invention below.   It is the slope view which provided the cut | notch part in the staggered position in the both sides | surfaces of the synthetic resin core material of this invention.   It is the slope view which similarly provided the notch recessed part on the both sides | surfaces of the synthetic resin core material of this invention in the position which opposes.   It is the side view which a part of which showed the manufacturing process of the molded article main body of this invention was omitted.   FIG. 5 is a side view of the whole part of the molded product main body according to the present invention in which a part of the jig is changed in the manufacturing process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molded product main body 2 Synthetic resin core material 3 Cover body 5 Side 7 Fixing projection piece 8 Deformation holding piece 9 Molding holding piece 10 Narrow gap part 11 Wide gap part 14 Molding die part 15 Deformation holding piece mold part 16 Fixation Protrusion mold portion 17 Cut portion 18 Cut recess portion 19 Head portion 21 First extrusion molding machine 22 First mold die 23 First cooling water tank 24 Feeding roller 25 Second extrusion molding machine 26 Second mold die 27 First 2 Cooling water tank 28 Jig 29 Punching machine 30 Molded product 31 Hollow seal

Claims (2)

  The synthetic resin core material extruded into a substantially U-shaped cross section by the first die from the first extrusion molding machine passes through the cooling layer while running, and then has a cut portion or a cut concave portion on both sides by a punching machine. After that, the synthetic resin core material enters the second mold die, and after heat-sealing the covering around the synthetic resin core material with the soft synthetic resin injected into the second extrusion molding machine, A deformation holding piece is formed by providing a wide gap portion opposed to each fixed protrusion piece inside the covering of the synthetic resin core material, and then the deformation holding piece is in a softened state after traveling inside the second mold die. A synthetic resin, wherein the deformation holding piece is bent toward the fixed projection piece by a jig and bent downward or upward so as to form a narrow gap, and then cooled and molded. A method for molding an extruded product of a core material.   The method for molding an extruded product of a synthetic resin core material according to claim 1, wherein a jig is installed adjacent to the second mold die in claim 1.

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