JP4019278B2 - Automotive molding having synthetic resin core material or method for producing the same - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an automotive molding having a synthetic resin core material used for a holding portion of an opening such as a trim, a weather strip, and a window molding for a vehicle body opening in an automobile door, trunk, window, etc. It is about the method.
[0002]
[Prior art]
Conventionally, a trim, weatherstrip, wind molding, and the like used for each opening of a vehicle body of this type of vehicle generally uses a metal core as a core.
[0003]
The metal core material as the manufacturing method is formed by punching out various shapes of cut portions with a flat cross section, and extruding the flat plate core material with the cut portions by a material such as synthetic resin or rubber. A coating layer and a holding piece are formed on the front and back of the material, and then the material is manufactured by being bent into a substantially U-shaped section.
[0004]
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 cut portions are formed by a punching machine, and a synthetic resin core material with cut portions is formed. 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.
[0005]
However, in order to improve the holding performance with the flange of the vehicle body opening of the automobile, it is necessary to reliably narrow the gap between the opposing holding pieces, and the desired shape and gap portion of the inner peripheral surface of the substantially U-shaped cross section There is a serious problem that it is technically very difficult to extrude the holding pieces with a narrow space between them.
[0006]
[Problems to be solved by the invention]
The present invention has been invented to solve the above-mentioned problems, and it is very important to narrow the gap between the holding portions that protrude from the inner peripheral surface of the conventional synthetic resin core material having a substantially U-shaped cross section and face each other. Therefore, in the present invention, the covering is extended from the front end of the substantially U-shaped cross section as shown in FIG. The inner peripheral pushing part of the shape is formed, and a holding piece is previously formed outside the inner circumferential pushing part, and the inner circumferential pushing part is pushed toward the inner surface of the substantially U-shaped cross section as shown in FIG. It is what you do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in the automotive molding having the synthetic resin core of the present invention, the molded product body is molded in the longitudinal direction with the synthetic resin core and the covering. In this synthetic resin core material, cut portions of various shapes are formed at the same interval or at irregular intervals. Further, the covering uses an olefin-based thermoplastic elastomer and heat- bonds a part of the outer periphery and a part of the inner periphery of the substantially U-shaped section of the synthetic resin core material. Furthermore, the inner peripheral pushing part which has the holding piece extended from the lower end part or inner surface part of the U-shaped one side of a synthetic resin core material is formed. Further, a holding piece is integrally provided on a part of the opposed inner circumferential surface where the inner circumferential pushing portion is pushed. Further, the synthetic resin core material is characterized in that only a predetermined portion is deformed to a thickness as required.
[0008]
[Action]
The use of the molding for automobiles having the synthetic resin core material configured as described above will be described. The molded product body (1) shown in FIGS. 1 and 6 is used as an opening for doors, trunks, windows, etc. of automobile bodies. A part of the covering (3) for heat-sealing the outer periphery of the substantially U-shaped section of the synthetic resin core material (2) of the molded product body (1) when used for trims, weather strips, wind moldings, etc. The inner peripheral pushing portion (5) is pushed into the inner side of the synthetic resin core (2) as shown in FIGS. At this time, a narrow gap (A) is formed between a predetermined position and a predetermined number of pressing pieces (6) (6) provided on the outer periphery of the inner peripheral pushing portion (5). Attachment is performed by inserting and pinching the edges of openings such as doors, trunks, and windows with respect to the gap (A).
[0009]
【Example】
Next, the embodiment of the present invention will be described with reference to the drawings. The molded product main body (1) shown in FIG. 1 is held for press contact in the state of FIG. 2 at the opening of a vehicle body such as an automobile door, trunk and window. The flanges are inserted into the narrow gaps (A) of the pieces (6) and (6) for use. In each of the sectional views shown in the figures, the molded product body (1) is composed of a synthetic resin core material (2) in the longitudinal direction having a substantially U-shaped section and a covering body (3) in the longitudinal direction.
[0010]
The synthetic resin core material (2) in the molded product body (1) shown in FIG. 1 has a substantially U-shaped cross section made of a hard synthetic resin as shown in FIGS. The side cut sections (8) and (8) or the upper cut sections (7) and (7) and the side cut sections (8) and (8) are connected to the connecting sections (10) and (10) and the connecting sections (11 ) (11) and the like, the interval portions (13) and (13) are punched out continuously or discontinuously at the same interval or irregular intervals. A code | symbol (14) shows the inner surface part inside the lower end of a synthetic resin core material (2).
[0011]
Next, the covering (3) for heat-sealing part of the outer periphery and part of the inner periphery of the substantially U-shaped cross section of the synthetic resin core material (2) in FIG. 1 is composed of an olefin-based thermoplastic elastomer . .
The covering (3) is integrally formed with an inner peripheral pushing portion (5) extending from the end portions (4) and (4) at the tip of the opening of the synthetic resin core material (2). One or a plurality of holding pieces (6) and (6) projecting to the outside of the pushing portion (5) are formed. At this time, it is preferable that the end portions (4) and (4) are firmly heat- sealed.
Further, in the case shown in FIG. 2, when the inner peripheral pushing portion (5) shown in FIG. 1 is attached to various parts of the vehicle body, the inner peripheral pushing portion (5) is pushed into the synthetic resin core (2). It shows the state. The holding pieces (6) and (6) at this time are surely formed in a predetermined shape and sufficiently fulfill the role of pressing and holding the flanges and the like of the opening of the vehicle body from both ends. Reference numeral (12) indicates a space portion, but there are cases where the inside is in a contact state and there is no space.
[0012]
Next, what is shown in FIG. 1 shows the embodiment shown in claim 1, and the synthetic resin core material (2) having a substantially U-shaped cross section has only one lower end (4) or inner surface (14). The cross-section which was extrusion-molded in the state where several holding pieces (6) and (6) for press contact were formed on the inner peripheral pushing part (5) which extends further is shown. Moreover, a part of the covering (3) may be heat-sealed as an inner peripheral covering (27) to the other lower end of the synthetic resin core (2).
2 shows a state when the state shown in FIG. 1 is attached to each opening of the vehicle body and used, and a space (12) is formed and the position is different. A narrow gap (A) is naturally formed between the holding pieces (6) and (6).
[0013]
Next, what is shown in FIG. 6 shows an embodiment of claim 2 and extends from the lower end (4) or the inner surface (14) on one side of the synthetic resin core (2) having a substantially U-shaped cross section. One or more holding pieces (6) and (6) are formed in the inner peripheral pushing portion (5) to be heat-sealed to the lower end of the other synthetic resin core (2). One or more holding pieces (6) and (6) are integrally formed in a part. The holding pieces (6) and (6) may be different in size as desired.
In FIG. 7, the inner peripheral pushing portion (5) of the molded product body (1) shown in FIG. 6 is pushed. In this case, a narrow gap (A) that cannot be formed by the prior art is naturally formed between the holding pieces (6) and (6) of different sizes.
[0014]
Next, FIG. 8 shows a molded product body (1) molded by a conventional technique, and the gap between the opposing holding piece (6) and holding piece (6) becomes a wide gap (B). The state which becomes the fault that the clearance gap between the flange (29) in which a panel (28) is inserted, and this holding piece (6) becomes large is shown.
[0015]
An embodiment of the production process for continuous production according to the present invention will be described with reference to FIG. 9. The first extrusion die (16) injected with hard synthetic resin is molded while passing through the inside of the first die (17). The synthetic resin core material (2) having a substantially U-shaped cross section is passed through the cooling tank (18), and then cut into various shapes (8) or cut parts (7) according to need by a punching machine (19). Are punched and formed at intervals (13) and (13) of the same interval or irregular intervals, and then the synthetic resin core material (2) with a cut-out portion enters the second mold die (21), and the second extrusion molding machine The covering (3) is formed on the outer periphery and a part of the inner periphery of the substantially U-shaped cross section by the soft synthetic resin injected into (20), and the covering is formed by heat, pressure and heat-fusibility during extrusion molding. (3), together with the thermally fused to the synthetic resin core member (2), the synthetic resin core member (2) The outer cover (3) is extended to form the inner peripheral pushing part (5), and the desired shape and quantity of the holding pieces (6) and (6) protruding outside the inner peripheral pushing part (5) are After extrusion molding integrally, it sends out through a cooling tank (30). Further, the holding piece (6) is integrally extruded on the other inner peripheral cover (27).
[0016]
Next, the material used in the present invention will be described. As a hard synthetic resin for forming the synthetic resin core material (2) having a substantially U-shaped cross section , talc powder is mixed with an olefin-based polypropylene resin to form a synthetic resin core. In some cases, the rigidity and heat resistance of the hard synthetic resin forming the material (2) are increased and the linear expansion coefficient is decreased.
Furthermore, the hardness of 90 or less (JIS K7215 A hardness) is used as the olefinic thermoplastic elastomer forming the covering (3).
Also, a soft synthetic resin that forms the inner peripheral pushing portion (5) and the holding piece (6) for pressure welding is also manufactured by using a single extrusion molding machine using the same material as the covering (3), When changing the hardness and type of the material depending on the desired function and quality of the circumferential indentation part (5) and holding pieces (6) and (6), polymerization extrusion molding should be performed by the second and third extruders. There is also.
[0017]
【The invention's effect】
According to the present invention configured as described above, the weight is reduced compared to the extrusion molding using a conventional metal core material, and the effect of excellent recyclability and the cross section of the core material of the hard synthetic resin from the flat plate The very difficult work of bending it into a substantially U-shape is also unnecessary. According to the extrusion molding of the present invention, the thickness of the synthetic resin core material having a substantially U-shaped cross section can be changed as necessary, and the cut portions of various shapes can be spaced at equal intervals or irregular intervals as necessary. By having this, there is an effect that it can be attached to a three-dimensional vehicle body.
Furthermore, as a hard synthetic resin that forms a synthetic resin core material, talc powder is mixed with an olefin-based polypropylene resin, thereby improving the rigidity and heat resistance of the synthetic resin core material and reducing the linear expansion coefficient. . Then, by forming the covering body with the olefin-based thermoplastic elastomer, the covering body and the synthetic resin core material can be surely and firmly heat-sealed, and the covering body is one of the outer periphery and inner periphery of the synthetic resin core material. It is not necessary to envelop the entire synthetic resin core member simply by heat-sealing the part, and there is an effect that a part of the covering can be saved.
Moreover, since the inner periphery pushing part was formed by extending the covering attached to the molded product body, and the holding piece was formed on the inner pushing part, the size and shape of the desired holding piece can be freely provided, There is an effect that the mounting and holding of the molded product on the flange of the opening of the vehicle body can be securely and firmly attached.
Furthermore, the base of the inner peripheral pushing portion is firmly attached and easily separated by extending the inner peripheral pushing portion provided with the holding piece of the present invention to the inner surface of the substantially U-shaped cross section of the synthetic resin core material. There is an effect that it is attached stably.
Further, by forming the holding piece integrally on a part of the inner peripheral covering of the inner peripheral surface of the opposing synthetic resin core material into which the inner peripheral pushing portion provided with the holding piece for press contact is inserted, Since the holding piece provided on the pressing pot that is fixed to the peripheral surface can be protruded freely in size, there is a convenient effect that the gap for inserting the flange can be adjusted narrowly and freely. Furthermore, if the thickness of the synthetic resin core material having a substantially U-shaped cross section is increased as necessary, the synthetic resin core material is toughened, and the portion requiring strength can be strongly reinforced. There is an effect.
Moreover, since the manufacturing method of this invention performs manufacture of a molded article main body continuously from a synthetic resin core material, it can manufacture a yield improvement and a price cheaply.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a molded product in which a cover and an inner peripheral pushing portion are attached to the outer periphery of a synthetic resin core material having a substantially U-shaped cross section according to the present invention.
FIG. 2 is a cross-sectional view showing a state where the inner peripheral pushing portion of the present invention is pushed into the synthetic resin core material.
FIG. 3 is a perspective view of the synthetic resin core material of the present invention.
FIG. 4 is a perspective view in which a continuous cut portion is similarly provided in the synthetic resin core material.
FIG. 5 is a perspective view in which a discontinuous cut portion is provided in the synthetic resin core material of the present invention.
FIG. 6 is a cross-sectional view showing a state during molding showing another embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a state in which the molded product shown in FIG. 6 of the present invention is used.
FIG. 8 is a cross-sectional view showing a molded product body according to the prior art, in which a wide gap is formed between holding pieces facing each other.
FIG. 9 is a side view showing a process for producing an extrusion-molded article of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molded product main body 2 Synthetic resin core material 3 Covering body 4 Lower end part 5 Inner peripheral pushing part 6 Holding piece 7, 8 Cutting part 10, 11 Connection part 13 Space | interval part 14 Inner surface part 16 First extrusion molding machine 17 1st metal mold | die Die 18 Cooling tank 19 Punching machine 20 Second extrusion molding machine 21 Second mold die 25 Tip part 26 Joining part 27 Inner peripheral coating (part)
28 Body panel 29 Flange A Narrow gap B Wide gap

Claims (4)

In moldings for automobiles that have synthetic resin cores such as trims, weather strips, window moldings, etc. used for car body doors, trunks and windows, etc., the molded product body (1) is made of polypropylene resin and talc powder. A synthetic resin core (2) having a substantially U-shaped cross section made of a hard synthetic resin mixed with a body and a covering (3) made of an olefin-based thermoplastic elastomer are molded in the longitudinal direction, and the synthetic resin core (2) Is formed by punching the cut portions (8) and (8) into the interval portions (13) and (13) having the same interval or irregular intervals, and the covering (3) is formed on the outer periphery and the inner portion of the synthetic resin core (2). A part of the circumference is heat-sealed , and several pieces are attached to the outer periphery of the inner peripheral pushing portion (5) extending downward from one lower end portion (4) or the inner surface portion (14) of the synthetic resin core material (2). Holding for pressure welding (6) an automotive molding having a synthetic resin core member, characterized in that integrally formed (6). A single or a plurality of holding pieces (6) are integrally formed on the inner periphery covering body (27) thermally fused to the inner periphery of the lower end of the synthetic resin core material (2) according to claim 1. An automotive molding having the synthetic resin core material according to claim 1. A method for manufacturing an automotive molding having a synthetic resin core material such as a trim, weather strip, window molding, etc. used in vehicle body openings such as doors, trunks and windows of an automobile body, wherein the manufacturing method includes talc on polypropylene resin. Synthetic resin core material (2) having a substantially U-shaped cross section formed while passing through the inside of the first mold die (17) from the first extrusion molding machine (16) into which the hard synthetic resin mixed with the powder is injected. After passing through the cooling tank (18), the excision parts (8) and (8) are punched and formed at intervals (13) and (13) of the same interval or irregular intervals by a punching machine (19), and then the excision part synthetic resin core material with (2) enters the second mold die (21), a substantially U-shaped by olefinic thermoplastic elastomer injected into the second extruder (20) Synthetic resin core member periphery and the inner periphery of the part covering body (2) and (3) heat-sealed, the synthetic resin core member while the lower end of (2) (4) or the inner surface portion (14) The automobile having a synthetic resin core material according to claim 1, wherein a plurality of holding pieces (6) and (6) for pressure welding are integrally formed by extruding the inner peripheral pushing portion (5) extended further. Method for molding. The synthetic resin core material (2) of claim 3 is characterized in that one or a plurality of holding pieces (6) are integrally extruded on the inner periphery covering body (27) thermally fused to the inner periphery of the lower end. A method for manufacturing an automotive molding having a synthetic resin core material.

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