JP2008143005A - Method for molding laminated molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve appearance by preventing the generation of a wrinkle in the inverse part of a cavity mold in a method for molding a laminated molding in which after a skin is set in an injection molding mold, a resin core material is molded by mold clamping to be integrated with the skin. <P>SOLUTION: The mold 20 is composed of a movable side core mold 30 having a resin supply mechanism and the cavity mold 40. The locate hole 12a of the skin is outserted to the skin set pin 41 of the cavity mold 40 to set the skin 12. A wrinkle removing pin 42 is installed toward the core mold 30 outside the inverse part 40b of the cavity mold 40 in the vicinity of the skin set pin 41. The skin 12 forwardly abuts on the mold surface of the core mold 30 during mold clamping by the wrinkle removing pin 42. During the molding of the resin core material 11, proper tension is applied to the skin 12 along a cavity shape so that the generation of the wrinkle can be prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method of forming a laminated molded article suitable for automobile interior parts typified by a front pillar garnish, a center pillar garnish, a rear pillar garnish, and the like. In a molding method of a laminated molded product in which the resin core material and the skin are integrated by a molding method, even if it is a deep drawn shape, it is possible to mold a laminated molded product with excellent appearance performance without generating wrinkles. The present invention relates to a molding method of a molded product.

  FIG. 9 shows a front pillar garnish 1 that is attached to the interior side of a front pillar panel (not shown) of a vehicle. The front pillar garnish 1 is molded into a desired curved shape, and has shape retention and attachment to the panel. In order to maintain a good surface feel and feel on the surface of the resin core material 2 having rigidity, a laminated molded product formed by laminating the skin 3 is used.

  Conventionally, as a method for manufacturing the front pillar garnish 1, an insert injection method tends to be frequently used in consideration of mass productivity. That is, as shown in FIG. 10, the molding die 4 used in the injection molding method is composed of a core die 5 and a cavity die 6 that can be clamped and opened with each other. When the mold 5 and the cavity mold 6 are in the mold open state, the skin set pin 7 of the cavity mold 6 is inserted into the locating hole 3a of the skin 3 to set the skin 3 to the cavity mold 6, and then the core mold 5 and the cavity mold 6 is clamped, and the resin core material 2 is molded by injection-filling the molten resin M into a cavity formed between the molds 5 and 6, and at the same time, the skin 3 is integrally molded.

  Further, the skin 3 is set in advance with respect to the cavity mold 6, and the setting position of the skin set pin 7 takes into account the shape of the front pillar garnish 1, the elongation characteristics of the skin 3, etc. As shown in FIG. 11, the actual situation is that the position of the skin setting pin 7 is appropriately changed by trial and error to cope with the shape change and the material change of the skin 3. A method for setting the skin 3 in a molding die in advance and integrating it with the resin core material 2 by an injection molding method and the die structure are described in detail in Patent Document 1.

JP 2002-46154 A

  As described above, in the conventional method for forming the front pillar garnish 1, wrinkles are likely to occur in the portion where the drawing shape indicated by A in FIG. 9 is tight, and the skin set pin 7 is shown in FIG. The actual situation is that wrinkle countermeasures are taken in the direction of the arrow as shown. However, a stable wrinkle removal effect could not be expected, and effective countermeasures against wrinkles were urgently needed.

  The present invention has been made in view of such circumstances. The skin is set in a cavity mold in advance, the core mold and the cavity mold are clamped, and then the molten resin is injected and filled into the cavity. This is a method for forming a laminated molded product that integrates a resin core and skin, and it can be used to form a laminated molded product that has excellent appearance performance and eliminates wrinkling even in areas where the drawing shape is tight on the product surface. It aims at providing the shaping | molding method of a molded article.

  To achieve the above object, according to the present invention, after setting the skin to the cavity mold, the cavity mold and the core mold are clamped, and the molten resin is injected and filled into the cavity between the molds. In a method for forming a laminated molded product for molding a laminated molded product obtained by molding the surface of the resin core material on the surface of the resin core, the outer part of the cavity mold is likely to be wrinkled. When the core mold and cavity mold are clamped with the wrinkle removal pin standing upright, the wrinkle removal pin brings the outer peripheral end material part of the skin into contact with the core mold in advance, and then wrinkles are generated. The skin is caused to follow the mold surface of the cavity mold while applying tension along the curved surface shape of the inverse part that is easy to be formed, thereby avoiding generation of wrinkles.

  Here, the laminated molded product is composed of a resin core material molded by injection molding and a skin integrated on the surface thereof, and the usage is pillar garnish such as front pillar garnish, center pillar garnish, rear pillar garnish. In addition, it is composed of a resin core material and a skin, and can be applied to all interior parts manufactured by the insert injection method.

  Next, as the resin core material, a thermoplastic resin material can be used, and can be appropriately selected from a wide range of thermoplastic resin materials. Usually, those that can be preferably used include polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, polyamide resins, polyacetal resins, polycarbonate resins, ionomer resins, Acrylonitrile / butadiene / styrene (ABS) resin can be used. Moreover, you may mix a filler in these thermoplastic resins. Examples of the filler that can be used include inorganic fibers such as glass fiber and carbon fiber, and inorganic particles such as talc, clay, silica, and calcium carbonate. Moreover, various additives, such as antioxidant, a ultraviolet absorber, a flame retardant, and a low shrinkage agent, may be mix | blended. On the other hand, as the skin, a thermoplastic resin sheet such as a thermoplastic olefin sheet and a vinyl chloride sheet, a laminated sheet material lined with a cushion layer such as polyurethane foam, polyethylene foam, polypropylene foam on the back surface of these thermoplastic resin sheets, A laminated sheet material having a cushion layer lined on the back side of a cloth sheet such as cloth or nonwoven fabric can be used.

  The molding die used in the method of the present invention is usually an injection molding die, and is composed of a pair of split molds of a core mold and a cavity mold that can be mutually clamped and opened. The core mold is provided with sprues, runners, and gates that serve as resin passages from the injection machine, and the cavity mold is directed to the core mold at, for example, the four corners of the outer periphery of the product cavity to set the skin. In particular, in the case of an inverse part where wrinkles are likely to occur, a wrinkle removing pin is also erected toward the core mold side. This wrinkle removal pin is set to be equal to or higher than the pin height of the epidermis set pin, and the tip shape is tapered, but it is not as sharp as the needle, and finally it breaks through the epidermis. Become. Regarding the setting position of the wrinkle removal pin, it is preferable to adjust the distance between the wrinkle removal pin and the skin set pin to about 20 to 70 mm in consideration of being supported by the skin set pin particularly when the skin is stretched.

  Therefore, according to the method of the present invention, if the skin is set on the cavity mold surface, the skin is supported by inserting the cavity mold skin set pins into the set holes provided at the four corners, and the wrinkles are The tip of the wrinkle removing pin provided on the outer portion of the inverse part that is likely to be generated presses the epidermis toward the core mold, and the epidermis is in a tent tension state at this site.

  Then, after setting the skin to the cavity mold, the core mold and the cavity mold are clamped, and then the molten resin is injected and filled into the cavity, but the outer skin of the portion where wrinkles are likely to occur during clamping First comes into contact with the core mold surface, and the skin is stretched along the inverse part of the cavity mold with the skin sandwiched at this part. No wrinkles are generated.

  Therefore, according to the method of the present invention, the wrinkle removal pin is erected on the outer side of the cavity mold inverse portion. Since it can be molded in a state where tension is applied to the epidermis in a place where wrinkles are likely to occur, it is possible to effectively eliminate wrinkles that have occurred conventionally, and laminate molding with a good appearance and good touch feeling Goods are obtained.

  As described above, the molding method of the laminated molded product according to the present invention is a portion near the cavity type skin set pin, provided with a wrinkle removal pin outside the inverse part, and after setting the skin to the cavity mold, Place the skin between the wrinkle removal pin and the core mold surface during clamping, and then shape the skin along the inverse part where wrinkles are likely to occur. Appropriate tension is applied to the outer skin of the skin to effectively eliminate wrinkles that have been generated in the past, improve the appearance of the appearance, and provide an effect of obtaining a laminated molded article having a good touch feeling.

  Hereinafter, embodiments of a method for forming a laminated molded product according to the present invention will be described in detail with reference to the accompanying drawings. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  FIGS. 1 to 8 show an embodiment of the present invention. FIGS. 1 and 2 are front and sectional views showing a front pillar garnish formed by the method of the present invention, and FIG. 3 is a molding used for the method of the present invention. FIG. 4 is an explanatory view showing the structure of the cavity mold in the molding die, and FIGS. 5 to 8 are explanatory views showing each step of the method of the present invention.

  1 and 2, a front pillar garnish 10 is attached to the interior side of a front pillar panel of a vehicle (not shown), and has a shape retention property that maintains a shape formed into a required shape and a mounting rigidity to the pillar panel. The resin core material 11 is used in the form of a laminated molded product having a skin 12 attached to the surface thereof. Examples of the resin core material 11 include polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, polyamide resins, polyacetal resins, polycarbonate resins, ionomer resins, Acrylonitrile / butadiene / styrene (ABS) resin can be used. In this embodiment, a composite polypropylene resin material in which talc is appropriately mixed is used, and is molded into a substantially C-shaped cross section by an injection molding method described later. The skin 12 is a thermoplastic resin sheet such as a thermoplastic olefin sheet or a vinyl chloride sheet, or a single sheet material of a fabric sheet such as a woven fabric or cloth, or a polyurethane foam on the back surface of the resin sheet or fabric sheet, A laminated sheet material lined with a cushion layer such as polyethylene foam or polypropylene foam can also be used.

  In the method of the present invention, in particular, the front pillar garnish 10 is excellent in appearance performance and feel without occurrence of wrinkles in places where wrinkles are likely to occur, such as deep irregularities, deep ridges, and grooves in the front pillar garnish 10. Can be provided.

  Before explaining the method of the present invention, the structure of the molding die 20 used in the method of the present invention will be described with reference to FIGS. The molding die 20 uses an injection molding method, and is generally composed of a core die 30 that can be mutually opened and clamped, and a cavity die 40. More specifically, the core mold 30 is provided with sprues, runners, and gates that serve as resin passages for molten resin supplied from an unillustrated injection machine, and the molten resin passes through the resin passages through the core mold 30 and the cavity mold 40. It is injected and filled into a cavity formed when the mold is clamped. For convenience, the runner is denoted by reference numeral 31. On the other hand, in order to set the skin 12 in advance, the cavity mold 40 is provided with skin set pins 41 that support the skin 12 at the four corners of the outer periphery of the product cavity portion 40a. In the embodiment, the pin height is 30 mm, and the pin is erected toward the core mold 30.

  The feature of the method of the present invention is that the cavity mold 40 corresponding to the product surface of the deep uneven portion where wrinkles are likely to occur is formed as a deep inverse portion 40b, and a wrinkle removing pin 42 is formed on the outer portion of the inverse portion 40b. Is standing toward the core mold 30. The pin height of the wrinkle removing pin 42 is equal to or longer than that of the skin set pin 41, and the tip portion is tapered but is not as sharp as the needle. In this embodiment, the distance between the skin setting pin 41 and the wrinkle removal pin 42 is set to 20 to 70 mm. This distance depends on the elongation characteristics of the skin 12 and the modeling surface of the front pillar garnish 10. Is determined in consideration of Moreover, it is good to set to 1 / 2-5 / 2 of the pin height of the said skin set pin 41. FIG. In addition, when the core mold 30 and the cavity mold 40 are clamped, the core mold 30 is provided with relief recesses 32 and 33 so that the skin mold pin 41 and the wrinkle removing pin 42 do not interfere with the core mold 30. It has been.

  Next, a method for forming the front pillar garnish 10 using the method of the present invention will be described with reference to FIGS. First, as shown in FIG. 5, when the core mold 30 and the cavity mold 40 are in the mold open state, the skin 12 is set on the mold surface of the cavity mold 40. The skin 12 is provided with a locate hole 12a at a position corresponding to the skin set pin 41 of the cavity mold 40. The skin 12 can be easily positioned by inserting the skin set pin 41 into the locate hole 12a. Is in a tent tensioned state by the tip 42a of the wrinkle removal pin 42.

  When the setting of the skin 12 is completed, the molding die 20 is driven and the core die 30 is operated in proximity to the cavity die 40. First, as shown in FIGS. The skin 12 is pressed by the wrinkle removing pin 42 and comes into contact with the mold surface of the core mold 30 before the skin 12 is adjusted along the cavity shape of the cavity mold 40. Then, the outer skin 12 near the portion where wrinkles are likely to occur is pressed into the core mold 30 by the tip of the wrinkle removal pin 42 and the skin 12 is sandwiched at this position. When the mold clamping of the cavity mold 40 is continued and the mold clamping is completed, the skin 12 where the wrinkles are likely to be generated is stretched by applying tension, so that no wrinkles are generated. Then, as shown in FIG. 8, after the core mold 30 and the cavity mold 40 are clamped, the molten resin M is injected and filled into the cavity C through the resin passage such as the runner 31 into the cavity. 11 is formed into a required curved surface shape, and the skin 12 is laminated and integrated on the surface of the resin core material 11 to form the front pillar garnish 10.

  Therefore, the molded front pillar garnish 10 does not generate wrinkles even in places where wrinkles are likely to occur, such as deep irregularities, and can maintain the appearance and feel of the skin and the skin 12 with the cavity mold 40. The set operation can be completed with a simple operation of simply inserting the locate hole 12a into the skin set pin 41. Further, since the wrinkle removing pin 42 provided in the cavity mold 40 causes the outer portion of the skin 12 where wrinkles are likely to occur to abut against the core mold 30 in order to eliminate wrinkles of the conventional set pin. Front pillar garnish 10 with excellent appearance that can eliminate the troublesome work of adjusting the position of the set pin by trial and error, and simplifying the setting work of the skin 12 with a simple structure of providing the wrinkle removal pin 42 Can be molded easily.

  In the embodiment, the method of the present invention is applied to the molding method of the front pillar garnish 10, but it can be applied to a center pillar garnish, a rear pillar garnish, and the like. It can be applied in general.

It is a front view which shows the front pillar garnish shape | molded by applying the method of this invention. It is the II-II sectional view taken on the line in FIG. It is a general view which shows the structure of one Example of the shaping die used for the shaping | molding method of the laminated molded product which concerns on this invention. It is explanatory drawing which shows the structure of the mold surface part of the cavity type | mold in the molding die shown in FIG. It is explanatory drawing which shows the setting process of the skin in the shaping | molding method of the laminated molded product which concerns on this invention. It is explanatory drawing which shows the prior | preceding contact state of the skin in the shaping | molding method of the laminated molded product which concerns on this invention. It is explanatory drawing which shows the prior | preceding contact state of the skin in the shaping | molding method of the laminated molded product which concerns on this invention. It is explanatory drawing which shows the injection filling process of the molten resin after the mold clamping in the shaping | molding method of the laminated molded product which concerns on this invention. It is the (a) front view and (b) sectional view showing the conventional front pillar garnish. It is explanatory drawing which shows the conventional method of the shaping | molding method which shape | molds the conventional front pillar garnish. It is explanatory drawing which shows the setting operation | work of the skin in the shaping | molding method of the conventional front pillar garnish.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front pillar garnish 11 Resin core material 12 Skin 12a Locating hole 20 Mold 30 Core mold 31 Runner 32, 33 Recessed recess 40 Cavity mold 40a Product cavity part 40b Inverse part 41 Skin set pin 42 Wrinkle removal pin M Molten resin C Product cavity

Claims (2)

After setting the skin (12) to the cavity mold (40), the cavity mold (40) and the core mold (30) are clamped, and the molten resin is placed in the cavity (C) between the molds (30, 40). (M) is injection-filled to mold the resin core material (11) into a required shape, and a laminated molded product (10) is formed by integrally pressing the skin (12) on the surface of the resin core material (11). In the method of forming the laminated molded product (10),
On the outer part of the cavity mold (40) where wrinkles are likely to occur, a wrinkle removal pin (42) is erected toward the core mold (30), and the core mold (30) and the cavity mold (40) At the time of mold clamping, the wrinkle removal pin (42) causes the outer peripheral end material portion of the skin (12) to abut against the core mold (30), and then follows the curved shape of the inverse part (40b) where wrinkles are likely to occur. A method of forming a laminated molded article, wherein the skin (12) is caused to follow the mold surface of the cavity mold (40) while applying tension to avoid wrinkling.   A skin set pin (41) for setting the skin (12) is erected on the outer four corners of the product cavity portion (40a) of the cavity mold (40), and the distance from the skin set pin (41) is 20 to The method for forming a laminated molded product according to claim 1, wherein a wrinkle removing pin (42) is erected at a position set to 70 mm.

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