JP2008207532A - Manufacturing method of extrusion-molding for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an extrusion-molding of an automobile such as a trim, a weather strip or the like to which a flange part of a circumferential margin of an opening such as a door, a trunk, a back door or the like of the automobile is attached. <P>SOLUTION: A synthetic resin core material having an approximately U-shaped cross section in a lengthwise direction is formed on a molding main body, and an outer circumferential coat layer and an inner circumferential coat layer each composed of a thermoplastic elastomer are hot melt-bonded to the synthetic resin core material. An incision is formed in a predetermined section of only one of face to face arranged hold pieces mounted on the inner circumferential coat layer. The synthetic resin core material having the approximately U-shaped cross section molded by the first mold dies of the first extrusion-molding machine goes into the second mold dies while travelling to hot melt-bond the outer circumferential coat layer and the inner circumferential coat layer to the inner and outer circumferences of the synthetic resin core material respectively and form the face to face arranged hold pieces of the inner circumferential coat layer. After the synthetic resin core material is passed through the second mold dies, the incision is formed in a part of the predetermined section of one hold piece by vertical movement of a blade type fixture followed by cooling. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing extruded products for automobiles such as trims, weather strips, and the like that are mounted on flanges at the peripheral edges of various vehicle bodies such as automobile doors, trunks, and back doors.

Extruded products for automobiles such as trims and weatherstrips that are mounted on the flanges around the opening edges of various vehicle bodies such as automobile doors, trunks, and back doors stand up and face each other from a substantially U-shaped inner peripheral coating layer. Although it was mounted and held on the flange by the holding piece, various parts of the flange portion at various places seem to be joined to a plurality of vehicle body panels depending on the location, and the flange is partially made thick. Yes.
Therefore, the partially thick wall flange portion inserts an extruded product for automobiles, but it becomes very large and very difficult to insert, and accuracy is hindered.

In order to solve the above-described problems, the present invention provides a molded product body for automobiles formed with a synthetic resin core material having a substantially U-shaped cross section in the longitudinal direction. The outer peripheral coating layer and the inner peripheral coating layer of the thermoplastic elastomer are heat-sealed, and the inner peripheral coating layer is provided with a holding piece projecting on the opposite inner surface, and the holding piece is provided only on one of the holding pieces. A notch that bends upward is formed only in a predetermined section in the longitudinal direction to reduce the insertion force of the flange. Moreover, one holding piece which forms a notch part is made into the shape where the whole length and width are larger than the other holding piece which opposes.
As a manufacturing method, the synthetic resin core material having a substantially U-shaped cross-section extruded by the first extrusion molding machine enters the second mold die, and the second extrusion molding machine uses the synthetic resin core material. The outer peripheral coating layer and the inner peripheral coating layer are thermally fused to the inner and outer peripherals, and at the same time, a holding piece facing the inner peripheral coating layer is formed, and is installed adjacent to the second mold die after passing through the second mold die. By operating the blade-shaped jig up and down, a notch is formed in a predetermined section in the longitudinal direction of the holding piece on one inner surface, and then passes through the cooling water tank.
Alternatively, a cutting tool is formed in a predetermined section with respect to a part of the holding piece on one of the inner side surfaces by moving the blade-shaped jig installed inside the cooling water tank up and down.

According to the method for producing an extruded product for automobiles according to the present invention, the extruded article body for automobiles forms a synthetic resin core material having a substantially U-shaped cross section in the longitudinal direction. The outer periphery coating layer and inner periphery coating layer which consist of thermoplastic elastomers are heat-seal | fused. In the inner peripheral coating layer, a cut portion is formed in a predetermined section of only one of the holding pieces on the opposite inner surface.
In addition, for a predetermined section of the thick portion of the flange portion, a cut portion is formed in a part of the holding piece to reduce the insertion force and increase the support force.
Furthermore, the whole holding piece forming the cut portion of one holding piece is enlarged.
As a manufacturing method, the synthetic resin core material having a substantially U-shaped cross section extruded by the first extrusion molding machine enters the second mold die, and the inside and outside of the synthetic resin core material by the second extrusion molding machine. An outer periphery coating layer and an inner periphery coating layer are heat-sealed around the periphery, and at the same time, a holding piece facing the inner surface of the inner periphery coating layer is formed, and a blade-shaped jig installed adjacent to the second die is provided. By operating up and down, a cut portion is formed in a predetermined section of the holding piece on one inner surface, and then passes through the cooling water tank.
Furthermore, a cutting tool is formed in the predetermined section of one holding piece in the middle of cooling when the blade-shaped jig installed inside the cooling water tank operates up and down.

According to the method for manufacturing an extruded product for an automobile of the present invention, as compared with a predetermined section in which a flange panel of a car body opening of an automobile is joined to a plurality of sheets and becomes a thick portion as in the past, However, if the bending force of one large holding piece is small, it is difficult to insert and a large insertion force is required, so that the work is very difficult.
Further, according to the present invention, an extruded product body for an automobile includes a synthetic resin core material having a substantially U-shaped cross section in the longitudinal direction and an outer peripheral coating layer and an inner periphery of the thermoplastic elastomer. Since the coating layer is heat-sealed and the cut portion is formed in only one predetermined section of the holding piece provided on the inner surface of the inner circumference coating layer, the holding piece can be easily inserted into the thick portion of the flange portion. Since it bends, it can be made small, and the holding piece has an effect of easily and reliably mounting the flange portion.
In addition, since the entire one of the opposing holding pieces provided on the inner peripheral coating layer is made large in size, there is also an effect that the cutting portion for bending the holding piece can be stably formed.

  Further, according to the present invention, a synthetic resin core material having a substantially U-shaped cross section is formed by the first die from the first extrusion molding machine, and then enters the second die, and the second die is formed. The outer peripheral coating layer and the inner peripheral coating layer are heat-sealed to the inner and outer periphery of the synthetic resin core material, and connected to the second mold die with respect to one opposing holding piece provided on the inner peripheral coating layer. By operating the installed blade-shaped jig up and down, there is an effect that a cut portion provided in a part of the holding piece in the heat softened state immediately after extrusion molding can be formed very easily. In addition, since the blade-shaped jig installed inside the cooling water tank operates up and down, there is an effect that a cut portion can be stably formed in a part of the holding piece during cooling.

  According to the present invention configured as described above, the holding piece (8) and the holding piece (9) provided on the inner surfaces facing each other provided on the inner peripheral coating layer (5) of the molded article body (1). When the cut portion (10) is formed in only one predetermined section as shown in FIG. 3, and the panels (13) and (13) of the flange portion (14) of the vehicle body opening are thick as shown in FIG. The one holding piece (8) bends along the side surface of the panel (13) so that the flange portion is stably inserted and joined.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an automobile for trims, weatherstrips, etc. mounted on flanges at the periphery of various vehicle body openings such as automobile doors, trunks, and back doors. The molded product body (1) is formed with a synthetic resin core material (2) having a substantially U-shaped cross section in the longitudinal direction. The synthetic resin core material (2) is integrally molded by thermally fusing the outer peripheral coating layer (3) and the inner peripheral coating layer (5) made of thermoplastic elastomer.
A holding piece (8) and a holding piece (9) are formed on the inner peripheral surface (6) and the inner side face (7) on the inner peripheral coating layer (5). One holding piece (8) is formed to have a larger cross section than the holding piece (9). Further, as shown in FIG. 1, the holding piece (8) is formed with a cut portion (10) only in a predetermined section in the longitudinal direction.
2 shows a cross section taken along the line AA of FIG. 1, and a synthetic resin core material (2) in the longitudinal direction is provided with an outer peripheral coating layer (3) and an inner peripheral coating layer (5) of a thermoplastic elastomer. ) Are heat-sealed, and the inner peripheral coating layer (5) has a notch (10) in both the holding piece (8) and the holding piece (9) on the inner side face (6) and the inner side face (7) facing each other. ) Is shown in a cross-sectional state. The code | symbol (12) shows the makeup | decoration lip provided in the outer side of this outer periphery coating layer (3), (11) shows a hollow seal.

FIG. 3 shows a cross section taken along line B-B of FIG. 1 relating to the present invention, in which a notch (10) is formed only in the holding piece (8) provided on the inner surface (6). It is.
4, the notch (10) of the holding piece (8) is bent in a predetermined section where a plurality of panels (13) (13) of the flange (14) are overlapped to become a thick portion. The state of this holding piece (8) when this flange part (14) is inserted is shown.
Next, what is shown in FIG. 5 shows a portion in which the cross section not forming the cut portion (10) is inserted into the thin flange portion (14).

  FIG. 6 shows another embodiment, and forms a disclosure portion (16) that does not cover a part of the respective coating surfaces of the outer peripheral coating layer (3) and the inner peripheral coating layer (5). . In addition, a plurality of holding pieces (8) provided with cut portions (10) provided in the inner peripheral coating layer (5) are configured.

Next, what is shown in FIG. 7 shows an embodiment of claim 1. A synthetic resin made of a thermoplastic elastomer is injected into a first extrusion molding machine (21), and a first mold die (22 ) To form a synthetic resin core material (2) having a substantially U-shaped cross section, and after passing through (23), a feed roller (24) and a cutting machine (25) as shown in FIG. A predetermined section is provided in the synthetic resin core material (2) having a substantially U-shaped cross section to cut the cut grooves (17) and (17) having various shapes. Thereafter, the molten thermoplastic elastomer that entered the second mold die (27) and was injected into the second extrusion molding machine (26) was synthesized inside the second mold die (27). An inner peripheral coating layer (5) provided with holding pieces (8) and holding pieces (9) facing the outer peripheral coating layer (3) on the inner and outer circumferences of the resin core (2) is heat-sealed. At this time, a hollow seal (11) and a decorative lip (12) are integrally formed on the outer peripheral coating layer (3).
Next, the blade-shaped jig (19) adjacent to the second die (27) is moved up and down, so that a part of a predetermined section of one holding piece (8) facing each other as shown in FIG. The cut portion (10) is formed, and the molded body (1) is completed after passing through the second cooling water tank (29). In addition, when using the thermoplastic elastomer from which the hardness of a hollow seal (11) differs, an extrusion molding machine is added and shape | molded. Further, the blade-shaped jig (19) may be installed between the second mold die (27) and the second cooling water tank (29).

  Next, what is shown in FIG. 8 shows an embodiment of claim 2, in which one holding piece (8) of the molded product body (1) formed by the second mold die (27) is provided. A blade jig (20) that operates up and down to form the cut portion (10) to be provided is installed inside the second cooling water tank (29), and the cut portion (10 ).

When the material used in the present invention is described, the synthetic resin core material having a substantially U-shaped cross section is an olefin resin and olefin thermoplastic elastomer having a hardness of HDA85 (JIS K7215) or higher, or talc or the like on these synthetic resins. A mixed synthetic resin in which 20 to 50% by weight of the above powder is mixed to increase rigidity and reduce the linear expansion coefficient. For example, 60% by weight of a polypropylene resin and 40% by weight of a talc powder are mixed into a mixed synthetic resin. In some cases, the linear expansion coefficient is reduced to 1/4 or less with respect to a synthetic resin core material of 100% by weight of polypropylene resin.
Further, as the thermoplastic elastomer for forming the outer peripheral coating layer and the inner peripheral coating layer, an olefinic thermoplastic elastomer having a hardness of HDA80 (JIS K7215) or less, or a foam thereof, a styrene thermoplastic elastomer, or a foam thereof. In addition, the hollow seal may use a thermoplastic elastomer having a hardness HDA60 (JIS K7215) or less, or a foam thereof, which is harder than the coating layer.

  It is the whole slope figure which a part of the molded product main body which represented the notch part in the predetermined area of the holding piece of this invention removed.   It is a vertical side view of the AA line of FIG. 1 of this invention.   It is a longitudinal side view of the BB line of FIG. 1 of the present invention.   It is the vertical side view which showed the state in which the holding piece bent upwards when the flange part which superposed | stacked the several panel was inserted in the molded article of this invention.   It is a vertical side view which shows the state in which the front-end | tip of the holding piece was bent in the flange part of the thin part of this invention.   It is the vertical side view which provided the part which wants to coat | cover a part of outer periphery coating layer and inner periphery coating layer similarly in this invention.   It is the side view in which a manufacturing process to a finished product of the present invention was partially omitted.   It is a side view in which a part of manufacturing process to other finished products of the present invention was omitted.   Similarly, it is a longitudinal side view in which a part of the holding piece of the present invention is partially cut away in a state in which a cutting portion is formed by a blade-shaped jig.   It is the slope view which provided the cutting groove in the synthetic resin core material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molded product main body 2 Synthetic resin core material 3 Outer periphery coating layer 5 Inner periphery coating layer 6, 7 Inner side surface 8, 9 Holding piece 10 Cut part 11 Hollow seal 12 Cosmetic lip 13 Panel 14 Flange part 15 Bent part 17 Cut groove 19 , 20 Blade-shaped jig 21 First extrusion molding machine 22 First mold die 23 First cooling water tank 25 Cutting machine 26 Second extrusion molding machine 27 Second mold die 29 Second cooling water tank

Claims (3)

  After the synthetic resin core material having a substantially U-shaped cross section is formed by the first mold die from the first extrusion molding machine, the synthetic resin core material enters the second mold die while running, and the synthetic resin core material The outer peripheral coating layer and the inner peripheral coating layer are heat-sealed to the inner and outer peripheral surfaces of the inner peripheral coating layer to form opposed holding pieces of the inner peripheral coating layer, and the upper and lower edges of the blade-shaped jig installed after passing through the second die A method of manufacturing an extruded product for an automobile, wherein a cut portion is formed in a part of a predetermined section of one holding piece by operation, and then cooling molding is performed.   After the synthetic resin core material having a substantially U-shaped cross section is formed by the first mold die from the first extrusion molding machine, the synthetic resin core material enters the second mold die while running, and the synthetic resin core material The outer peripheral coating layer and the inner peripheral coating layer are heat-sealed to the inner and outer peripheral surfaces of the inner peripheral coating layer, and then the opposing holding pieces of the inner peripheral coating layer are formed, and the blade jig installed inside the cooling water tank is operated vertically. 2. A method for producing an extruded product for an automobile according to claim 1, wherein a cut portion is formed in a part of a predetermined section of one holding piece in the course of cooling.   The whole holding piece which forms the notch part of the holding piece of the opposing inner surface provided in this inner peripheral coating layer in Claim 1 and 2 was made into the large holding piece rather than the opposing holding piece, It is characterized by the above-mentioned. The manufacturing method of the extrusion molded product for motor vehicles of Claim 1 and 2.

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