JP2007276203A - Molding method of laminated molded product and mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance ejection workability capable of performing the ejection of an edge material skin simultaneously with the ejection of a laminated molded product after molding using a process of a type for performing the terminal treatment of a skin by the same mold after molding, in a molding method of the laminated molded product due to an insert injection process and the mold. <P>SOLUTION: The mold 20 comprises a cavity mold 30, a core mold 40 and a slide core 50, and the terminal cutting treatment of the skin 12 is performed by the shearing action between the slide core 50 and the core mold 40 while a connection piece forming groove part 45 is formed on the side of either one of the core mold 40 and the slide core 50 to integrate the edge material skin 12A and the product to enhance productivity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method and a molding die for a laminated molded product using an insert injection method, and more particularly, to a molding method and a molding die for a laminated molded product capable of performing a scrap material skin recovery operation skillfully. .

  Usually, various interior parts are mounted on the vehicle interior. For example, as shown in FIG. 13, the pillar garnish 1 mounted on the indoor surface side of the pillar panel is laminated and integrated with a skin 3 having a good feel and surface appearance on the surface of a resin core material 2 formed into a curved shape. Laminated molded products are often used.

  A conventional molding method for molding the pillar garnish 1 will be described with reference to FIG. First, the molding die 4 to be used is composed of a cavity die 5 and a core die 6, and the cavity die 5 is a movable side, which is movable for a predetermined stroke by a cylinder or the like (not shown). The molten resin M, which is the material of the resin core material 2, is supplied to a predetermined position on the mold surface of the core mold 6 through these resin passages through the manifold 6 a and the gate 6 b. Then, when the cavity mold 5 and the core mold 6 are in the mold open state, the skin 3 is laminated on the inner surface of the cavity mold 5. Thereafter, the cavity mold 5 and the core mold 6 are clamped, and the molten resin M is injected and filled into the product cavity between the cavity mold 5 and the core mold 6 through the manifold 6a and the gate 6b. 2 is formed into a curved shape, and the skin 3 is laminated and integrated on the surface side of the resin core material 2. When the molding is completed, the mold opening operation is performed to remove the pillar garnish 1, and after the skin 3 is cut, the winding operation is performed to complete the molding of the pillar garnish 1 shown in FIG.

  Also, recently, in order to simplify the terminal treatment process of the skin 3 such as the cut process of the skin 3 and the entrainment process of the skin 3, the lower surface of the cavity mold 5 along the outer periphery of the product cavity C as shown in FIG. The slide core 7 is arranged so as to be able to move forward and backward, and the peripheral edge of the epidermis 3 is pierced and held on the set pin of the slide core 7 to set the epidermis 3 as shown in FIG. Then, as shown in FIG. 15B, after the cavity mold 5 and the core mold 6 are clamped, as shown in FIG. 15C, the slide core 7 slides to move the skin 3 to the slide core 7. It has also been conventionally carried out that the end treatment process of the skin 3 is performed using the same molding die 4 in succession to the molding process by performing the cutting process by the shear action between the core mold 6 and the core mold 6 ( For example, see Patent Document 1.) The cut skin 3 is not drawn into the product cavity C by being sandwiched between the slope portion 6c of the core mold 6 and the slope portion 7a of the slide core 7 in FIG. .

Japanese Unexamined Patent Publication No. 1-195011

  As described above, in the conventional insert injection method in which the end treatment of the skin 3 is performed continuously with the molding process, the slide core 7 is formed as a method of forming a laminated molded product obtained by laminating the skin 3 on the surface of the resin core material 2. After entering the core mold 6, the skin 3 is cut by the shearing action between the slide core 7 and the core mold 6, and after the skin 3 is cut, the skin 3 is interposed between the slide core 7 and the core mold 6. In order to remove the pillar garnish 1 from the molding die 4, both the pillar garnish 1 and the end material skin 3 a are taken out 2. It is necessary to take out the process, which is a factor of reducing productivity.

  The present invention has been made in view of such circumstances, and in a molding method and a molding die for molding a laminated molded product of a resin core material and an outer skin using an insert injection method, it is difficult to take out the product. An object of the present invention is to provide a molding method and a molding die for a laminated molded product which can be performed well and can improve productivity.

  In order to solve the above problems, the present invention includes a movable cavity mold and a fixed core mold, and a slide core disposed on the lower surface of the cavity mold along the outer periphery of the product cavity formed between both molds. In the molding method of a laminated molded product in which the resin core material is molded into a required shape using the molding die to be formed and the skin is laminated and integrated on the surface of the resin core material, when the mold is opened, After setting the skin by holding the peripheral edge of the skin on the lower surface of the slide core, the cavity mold and the core mold are clamped, and the resin core material melted in the product cavity formed between both molds When the resin core material is molded into the required shape by injection filling the resin, and when the skin is laminated and integrated on the surface side of this resin core material, before injection filling of the molten resin or after injection filling of the molten resin Either The slide core is moved forward toward the center of the mold by cutting, and the skin is cut with a shear structure between the slide core and the core mold along the cut line. Since the connecting piece forming groove is formed on either one side of the slide core, it is characterized in that the separation between the laminated molded product side skin and the end material skin is avoided.

  Furthermore, the molding die used in the method of the present invention is a molding die used in the skin insert injection method, and this molding die comprises a movable side cavity die, a fixed side core die, and an outer periphery of a product cavity. The slide core is arranged on the lower surface of the cavity mold and can be moved back and forth toward the center of the mold, and the skin is cut by the forward and backward movement of the slide core. A connecting piece forming groove is formed on any of the above.

  Here, the use of the laminated molded product includes various pillar garnishes, luggage side trims, rear side trims, door trims, etc., such as front pillar garnishes, center pillar garnishes, and rear pillar garnishes. And it can apply to all the laminated molded products provided with the resin core material shape | molded by the desired curved surface shape, and the skin stuck on the surface of a resin core material. The resin core material is made of polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, ionomer resin. And acrylonitrile / butadiene / styrene (ABS) resin. As a material for the skin, cloth such as tricot, jersey, and moquette, non-woven fabric, and thermoplastic resin sheet can be used, and it is preferable to laminate the non-woven fabric on the back surface of the fabric sheet or resin sheet for reinforcement.

  Furthermore, the mold is composed of a movable cavity mold, a fixed core mold, and a slide core disposed on the mold surface of the cavity mold along the outer periphery of the product cavity. By holding the peripheral edge of the epidermis on the set pin, the slide core is used for the epidermis setting process and the slide core is advanced toward the center of the mold to perform trim trimming of the epidermis. That is, the skin is cut by the shearing action between the slide core and the core mold. At this time, since the connecting piece forming groove is formed on either the core mold or the slide core, the end material skin is not divided from the laminated molded product.

  As is clear from the above configuration, after the cavity mold and the core mold are clamped, the molten resin is injected and filled into the product cavity to form a resin core material in a desired curved shape, and in the product cavity in advance. It is possible to form a laminated molded product by integrating with the skin set on the surface. Furthermore, the skin is cut by the shearing action between the slide core and the core mold by moving the slide core inward at any timing before or after injection of the molten resin. However, at this time, since the connecting piece forming groove is formed on either the core mold or the slide core, the skin on the main body side and the end material skin are not cut, If the molded laminated molded product is taken out after the mold is opened, the end material is also collected at the same time.

  Next, in a preferred embodiment of the molding die according to the present invention, a saw blade structure is adopted at a corner portion of the slide core that achieves a shear structure with the core die. . According to this embodiment, since the corner portion of the slide core is set in a saw blade shape, the cutting process can be performed efficiently when the skin is cut. For example, in the case of a tricot cloth having a long bristle, etc., there is a tendency that a yarn residue or the like is generated in the cut processing part. In the case of a cloth having a high yarn density, the surface pressure of the cut surface is high, and the post-process There was a drawback that it was necessary to pull and cut, but if you set the corner part of the slide core to a saw blade shape like this embodiment, you can cut all kinds of crosses, Since it can be pushed out at low pressure, it can contribute to labor saving of the slide core and the cut portion has a good appearance.

  As described above, according to the method for molding a laminated product and the molding die according to the present invention, a skin such as a cloth is set in a cavity mold, and after mold clamping, a molten resin is injected and filled into the product cavity. Thus, the resin core material can be molded into a desired curved surface shape, and the skin can be laminated and integrated on the surface side to form a laminated molded product. At that time, the slide core is advanced toward the inside, and the end material of the skin is cut by the shearing action between the slide core and the core mold. Furthermore, since the connecting piece forming groove is formed on one side of the core mold or the slide core, the end material skin is joined to the main body side skin through the connecting piece. If the material is taken out, the end material skin can be collected at the same time, and the workability in the taking-out operation can be improved.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode of a method for molding a laminated product and a molding die according to the present invention will be described in detail below 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.

  FIG. 1 to FIG. 12 show an embodiment of the present invention. FIG. 1 is a cross-sectional view showing the structure of a laminated molded product according to the present invention, and FIG. 2 shows the entire molding die of the laminated molded product according to the present invention. 3 and 4 are sectional views and perspective views showing the main part of the molding die, FIGS. 5 to 8 are explanatory diagrams of each process of the present invention, and FIG. 9 is molded by the present process. FIG. 10 to FIG. 12 show a modification of the molding die according to the present invention, and FIG. 10 shows the main part of the molding die. Sectional drawing, FIG. 11 is explanatory drawing which shows the saw blade shape of a slide core, FIG. 12 is explanatory drawing which shows the modification further.

  In FIG. 1, a pillar garnish 10 which is a laminated molded product is attached to the interior surface of a pillar panel of a vehicle (not shown) via a fixing means such as a clip, and has a fine shape such as a clip seat or a reinforcing rib. A schematic configuration of the omitted pillar garnish 10 is shown. This pillar garnish 10 is configured by laminating and integrating a skin 12 on the surface of a resin core 11 having shape retention and mounting rigidity to a pillar panel (not shown). The resin core material 11 is formed into a desired curved shape by an insert injection method described later. Examples of the material 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, ionomers. Resin, acrylonitrile / butadiene / styrene (ABS) resin, and the like. Further, as the skin 12, cloth such as tricot, jersey, and moquette, nonwoven fabric such as polyester fiber nonwoven fabric, PP fiber nonwoven fabric, polyester / PP blended nonwoven fabric, or synthetic resin sheet such as TPO (thermoplastic olefin) sheet, PVC sheet, etc. Can be used. In the present embodiment, a tricot cloth having long hairs is used, and a reinforcing nonwoven fabric may be backed on the back surface of the tricot cloth.

  Next, the structure of the molding die 20 for molding the pillar garnish 10 will be described with reference to FIGS. The molding die 20 has a cavity mold 30 on the movable side, a core mold 40 on the fixed side, and a peripheral edge of the cavity mold 30 so as to function effectively in the skin 12 setting process and the skin 12 terminal treatment process. The slide core 50 is generally composed of a slide core 50 disposed on the surface.

  More specifically, the cavity mold 30 can be moved up and down by a predetermined stroke by driving the elevating cylinder 31, and the core mold 40 is provided with a manifold 41 and a gate 42 as a resin passage for a molten resin supplied from an unillustrated injection machine. The molten resin M is supplied to the mold surface of the core mold 40. In order to push up the molded pillar garnish 10 upward, an ejector plate 43 and an ejector pin 44 are provided as ejector mechanisms.

  In the molding die 20 according to the present invention, the slide core 50 is provided on the lower surface of the cavity mold 30 along the outer periphery of the product cavity C defined between the cavity mold 30 and the core mold 40. . The slide core 50 is supported by a cylinder 51 attached to the cavity mold 30 so as to be movable back and forth in the direction of the arrow in FIG. 3. The cylinder 51 is fixed to the cavity mold 30 via a bracket 52. On the lower surface of the slide core 50, a set pin 53 for setting the peripheral edge of the skin 12 is provided. In addition, a shear structure is employed between the slide core 50 and the core mold 40 so that the skin 12 can be cut. That is, as shown in FIGS. 3 and 4, trim cut processing of the skin 12 is performed by adjusting the clearance between the corner portion 54 at the upper edge of the front surface of the slide core 50 and the corresponding corner portion 40 a of the core mold 40. Furthermore, in order to simplify the operation of collecting the end material cover (indicated by reference numeral 12A in FIGS. 8 and 9) during the cut processing of the outer skin 12, the core mold 40 includes the end material cover 12A and a molded product. A connecting piece forming groove 45 for integration is provided. The connecting piece forming groove 45 is set to have a width of about 1 mm. In this embodiment, in addition to the corner portion 40a of the core mold 40 corresponding to the corner portion 54 at the front upper edge of the slide core 50, the core die 40 corresponding to the corner portion 55 at the lower front edge of the slide core 50 is used. Also for the corner portion 40b, the connecting piece forming groove portion 45 is set. However, the connecting piece forming groove portion 45 is set at least in the corner portion 40a of the core mold 40 corresponding to the corner portion 54 at the upper edge of the front surface of the slide core 50. Just do it.

  Next, each step of the method of the present invention will be described in detail with reference to FIGS. First, the skin 12 is set on the molding die 20. As shown in FIG. 5, when the cavity die 30 is at the uppermost position, the peripheral portion of the skin 12 is pierced into the set pin 53 on the lower surface of the slide core 50. Then, the setting work of the epidermis 12 is completed. Thereafter, the lift cylinder 31 is driven to lower the cavity mold 30 by a predetermined stroke, and the cavity mold 30 and the core mold 40 are clamped as shown in FIG. When the mold clamping is completed, the slide core 50 moves forward in the direction of the arrow in FIG. 6 due to the extending action of the cylinder 51, and seals along the outer periphery of the product cavity C. Thereafter, as shown in FIG. The molten resin M is injected and filled into the cavity C.

  And the molten resin M hardens | cures through the cooling process of predetermined time, and the resin core material 11 is shape | molded. Further, as shown in FIG. 8, the slide core 50 bites inward by the extension action of the cylinder 51, and cuts the skin 12 along the trim cut line. That is, the skin 12 is cut by the shear structure between the corner portion 54 at the front upper edge of the slide core 50 and the corner portion 40 a of the core mold 40. The skin 12 may be cut between the corner portion 55 at the lower edge of the front surface of the slide core 50 and the corner portion 40b of the core mold 40 depending on the material and thickness of the skin 12 or the operating speed of the slide core 50. is there. During the forward movement of the slide core 50, in addition to the cutting process at the corner part 54 at the upper edge of the slide core 50, the cutting process at the corner part 55 at the lower edge of the slide core 50 is performed. Since the connecting piece forming groove 45 is formed on the side, the pillar garnish 10 side skin 12 and the end material skin 12A are connected via the connecting piece 13, and the end material skin 12A of the outer skin 12 is in the mold. When the pillar garnish 10 is taken out, the end material skin 12A can be taken out at the same time.

  In the above-described embodiment, the molten resin M is injected and filled into the product cavity C to form the resin core material 11, and then the slide core 50 is slid to cut the skin 12. Alternatively, the molten resin M may be injected and filled after the above is performed. Further, since the cut skin 12 is securely sandwiched between the inclined surface portion 40c of the core mold 40 and the inclined surface portion 54a of the slide core 50 slightly inside the cut line, it is drawn into the product cavity C. It will not be.

  Next, FIGS. 10 to 12 show a modification of the present invention. As shown in FIG. 10, in this modification, a saw blade 56 is set at a corner portion 54 at the front upper edge of the slide core 50. . FIG. 11A is a schematic top view, and FIG. 11B is an overall schematic diagram. Even if a tricot cloth or the like having a high yarn density is used as the material of the skin 12, there is no problem such as a yarn remaining or insufficient shortage, and even if the cylinder pressure from the cylinder 51 is set low, the accuracy The skin 12 can be well cut. That is, by adopting the saw blade 56 as the upper edge corner portion 54 on the front surface of the slide core 50, it becomes possible to cut from a cloth having a high density to a cloth having a low density, and the degree of freedom in selecting a material is drastically increased. In addition to being improved and being pushed out at low pressure, a large load is not required for the slide core 50, so that the maintenance period becomes longer and the maintenance cost can be reduced. Furthermore, there is an advantage that the finishing process is not required and the appearance of each terminal portion is improved.

  Next, as shown in FIG. 12A, if the apex of the saw blade 56 is changed from a square shape to an R blade 56A shape, it is effective in cutting the firm skin 12. In addition, as shown in FIG. 12B, the die cost can be reduced by adopting a saw blade 56B shape having a large pitch.

  In the above-described embodiment, the insert injection method in which the skin 12 is set in the molding die 20, the cavity die 30 and the core die 40 are clamped, and then the molten resin M is injected and filled into the product cavity C. The injection of the molten resin M is started before the cavity mold 30 and the core mold 40 are clamped, and the molten resin M is distributed in the product cavity C by the press pressure from the cavity mold 30. Also good.

  In the embodiment according to the present invention, the connecting piece forming groove 45 is set in the core mold 40, but the connecting piece forming groove can be set on the slide core 50 side. In addition, the method of the present invention and the molding die 20 are applied to the formation of the pillar garnish 10, but the application object is to use an insert injection method in which the skin 12 is laminated on the surface of the resin core material 11. For example, the present invention can be applied to all laminated molded articles suitable for interior parts such as rear side trim, luggage side trim, door trim, roof trim, rear parcel shelf and the like.

It is a schematic sectional drawing which shows the pillar garnish shape | molded by this invention method. It is explanatory drawing which shows the whole structure of the shaping die of the laminated molded product which concerns on this invention. It is sectional drawing which shows the principal part in the shaping die shown in FIG. It is a perspective view which shows the principal part in the shaping 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 shape | molds pillar garnish using the shaping die shown in FIG. It is explanatory drawing which shows the mold clamping process of the shaping die in the shaping | molding method of the laminated molded product which uses the shaping die shown in FIG. It is explanatory drawing which shows the supply process of the molten resin in the shaping | molding method of the laminated molded product which uses the shaping die shown in FIG. It is explanatory drawing which shows the terminal process process of the skin in the shaping | molding method of the laminated molded product which uses the shaping die shown in FIG. It is explanatory drawing which shows the state which took out the laminated molded product shape | molded by the method of this invention from the shaping die. It is explanatory drawing which shows the principal part of the modification of the shaping die concerning this invention. FIG. 11A is a schematic top view of a slide core in the molding die shown in FIG. 10, and FIG. It is explanatory drawing which shows the modification of the saw blade of the slide core shown in FIG. It is sectional drawing which shows the structure of the conventional pillar garnish. It is explanatory drawing which shows the shaping | molding process of the conventional pillar garnish. It is explanatory drawing which shows the shaping | molding process including the terminal processing process of the conventional pillar garnish.

Explanation of symbols

10 Pillar garnish (laminated molded product)
DESCRIPTION OF SYMBOLS 11 Resin core material 12 Skin 12A End material skin 13 Connecting piece 20 Molding die 30 Cavity type (movable side)
31 Lifting cylinder 40 Core type (fixed side)
41 Manifold 42 Gate 43 Ejector plate 44 Ejector pin 45 Connecting piece forming groove 50 Slide core 51 Cylinder 52 Bracket 53 Set pin 54, 55 Corner 56 Saw blade C Product cavity M Molten resin

Claims (3)

It is arranged on the lower surface of the cavity mold (30) along the outer periphery of the product cavity (C) formed between the movable cavity mold (30), the fixed core mold (40), and both molds (30, 40). The resin core material (11) is molded into a required shape using a molding die (20) comprising a slide core (50), and the skin (12) is laminated and integrated on the surface of the resin core material (11). In the method of forming a laminated molded product (10) formed by
When the mold (20) is opened, after the peripheral edge of the skin (12) is held on the lower surface of the slide core (50) to set the skin (12), the cavity mold (30) and the core mold (40 ) And the molten resin (M), which is the material of the resin core material (11), is injected and filled into the product cavity (C) formed between the molds (30, 40). When the core material (11) is molded into a required shape and the skin (12) is laminated and integrated on the surface side of the resin core material (11), before injection filling of the molten resin (M) or the molten resin (M ) At any timing after injection filling, the slide core (50) is moved forward toward the center of the mold, and between the slide core (50) and the core mold (40) along the cut line. Cut the skin (12) with a shear structure and By forming the connecting piece forming groove (45) on either the core mold (40) or the slide core (50) at the time of the cutting process, the laminated molded product (10) side skin (12), A method for forming a laminated molded product, characterized by avoiding separation from the end material skin (12A).   A molding die (20) used for the skin insert injection method, which is composed of a movable cavity die (30), a fixed core die (40), and a product cavity (C). The slide core (50) is arranged on the lower surface of the cavity mold (30) along the outer periphery of the mold, and can be moved back and forth toward the center of the mold. 12) A die for forming a laminated product, wherein the cut processing of 12) is performed, and a piece-forming groove portion (45) is formed in either the core die (40) or the slide core (50). The saw blade (56) structure is employed in the corner portion (54) of the slide core (50) that achieves a shear structure with the core mold (40). Molds for laminated molded products.

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