JP2008073969A - Method of molding press molding and molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of molding a press molding on condition of trim cutting after press molding and a molding mold allowing smooth removal of a press molding after press molding. <P>SOLUTION: For molding a press molding 50 to a specified shape by the use of a press molding mold 20 consisting of a molding upper mold 30 and a molding lower mold 40, a pin 32 is arranged in the molding upper mold 30 for molding a cap 51 for location at a predetermined position of the end material, and plungers 33 are arranged on both sides of the pin 32 in such a spring-impelled way as to press downward. Even when there occurs a resistance between the pin 32 and the press molding 50 on removal of the press molding 50, the plungers 33 press the press molding 50 downward so as to prevent the sticking of the press molding 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a molding method and a molding die for a press-molded product, and particularly to a molding method and a molding die for a press-molded product that can be smoothly removed from the molding die.

  FIGS. 9 and 10 are a front view and a cross-sectional view, respectively, showing a roof trim 1 mounted on the indoor surface side of the roof panel of the vehicle, as seen from the indoor surface side. The roof trim 1 has a shape retaining property and a roof panel. The skin 1b having excellent surface feel and surface texture is adhered to the surface of the core 1a having mounting rigidity with respect to the surface. And in order to shape | mold the roof trim 1, the press molding die 2 shown in FIG. 11 is used. The press molding die 2 includes a molding upper die 3 that can move up and down by a predetermined stroke, and a molding lower die 4 on a fixed side located below the molding upper die 3. Thus, the product is formed along the product shape of the roof trim 1.

  As a material for the roof trim 1, the core material 1a is obtained by heat-softening a raw sheet obtained by extruding a polypropylene resin reinforced with glass fiber obtained by adding 50 parts by weight of glass fiber to 50 parts by weight of polypropylene resin. The upper and lower molds 3 and 4 are drawn to a required shape. At this time, a pin 5 is fixed to the periphery of the mold surface of the molding upper die 3 on the molding upper die 3, and the cap trim locating shape 1 c is formed on the roof trim 1 by this pin 5. As shown in FIG. 12, the locating pin 1a is fitted into the locating pin 6a of the laser cutting die 6 and the roof trim 1 is accurately positioned on the laser cutting die 6 to trim the product along the product shape. The actual situation is processing. Incidentally, a molding method for press-molding the roof trim 1 into a required shape and a configuration of a molding die using a thermoformable raw sheet are described in detail in Patent Document 1. A trim cut mold other than the laser cut mold 6 may be used.

JP 2001-225343 A

  As described above, in a press product such as the roof trim 1, the mold 2 (comprising the upper and lower molds 3 and 4) is clamped after heat-softening the heat-formable raw sheet S1. The cap-shaped locate shape 1c is simultaneously formed in consideration of the workability of the positioning operation in the next laser cutting process, as shown in FIG. When removing the roof trim 1, the pin 5 becomes resistance, the roof trim 1 sticks to the molded upper die 3, and the takeout failure frequently occurs, which points out the problem of significantly reducing the takeout workability. Has been.

  The present invention has been made in view of such circumstances, and in press forming of a roof trim of a vehicle, a press-formed product is formed into a required shape by clamping a formed upper and lower molds, and a laser cut mold in the next process An object of the present invention is to provide a molding method and a molding die for a press-molded product, which can smoothly perform a demolding operation of the press-molded product after molding when simultaneously forming a locate shape to be positioned on a trim cut die.

  In order to solve the above-mentioned problems, the present invention, after heat-softening a thermoformable raw sheet, is put into a molding upper and lower molds, and a press-molded product having a required shape is molded by clamping the molding upper and lower molds. In the molding method of the press-molded product when the press-molded product is set in the trim-cut mold and the trim part is subjected to the trim-cut process according to the product shape, The locating cap to be attached to the trim-cut type locating pin is formed, and the pin for forming the locating cap is protruded from the periphery of the mold surface of the molding upper mold for molding the press-molded product. Plungers for pressing the press-formed product downward are urged downward on both sides of the mold so that the press-formed product does not stick to the upper mold when the press-formed product is removed. It is characterized in.

  Furthermore, the molding die used in the method of the present invention is a heat-moldable raw sheet that is heat-molded, and then placed in the molding upper and lower molds. After the molding, the press-molded product is set on a trim-cut mold, and the press-molding mold for molding the press-molded product when producing an interior part that is trimmed along the product shape. A pin for molding a locating cap to a press-molded product is fixed to the periphery of the molding surface of the molding die in the molding die, and a plunger is installed on both sides of the pin by being biased downward. When molding a press-molded product, the plunger is buried in the molding upper mold to ensure the moldability of the press-molded product, and after molding, both sides of the locating cap are pushed by the spring pressure of the biasing spring. Pressed downward by the manager, locate cap is characterized in that to promote the withdrawal from the pin of the upper die.

  Here, regarding the relationship between the press-molded product and the interior part, a product obtained by press-molding a thermoformable raw sheet into a required shape by clamping the upper and lower molds is called a press-formed product as a semi-finished product. The press-formed product is subjected to trim cut processing such as laser cut processing along the product shape and, if desired, opening is called an interior part as a final product.

  If the sheet material is a thermoformable sheet material, glass fibers and fillers are mixed into a general-purpose thermoplastic resin such as polypropylene resin and polyethylene resin, and then extruded into a sheet by a T-die extruder. Use the same thing. If desired, a skin such as a thermoplastic resin sheet, a woven fabric, or a nonwoven fabric sheet may be integrated with the surface of the substrate during press molding. In addition, the locating caps formed on the press-formed product are set at a plurality of locations where the end material is planned to be used as the end material by the trim cut process in the next step.

  And as a press mold for molding a cap for locating, a pin is fixed by screwing a screw part into the mold peripheral edge of the molding upper mold, the end material forming location, Plungers are provided on both sides of the pin so as to be able to be immersed in the molding upper die and are always biased downward by a biasing spring. Therefore, this plunger is immersed in the upper mold at the time of press molding and does not interfere with the press molding, but at the time of demolding after molding, the plunger is pressed by a biasing spring. By pressing in the mold release direction, even if resistance is generated between the press-molded product and the pin, the press-molded product does not stick to the molding upper mold, and a smooth demolding operation becomes possible.

  As described above, the molding method and the molding die for the press-molded product according to the present invention are obtained by heat-softening a heat-formable raw sheet, press-molding it into a required shape using a molding upper and lower molds, and then pressing the molded product. Is placed on the trim cut mold and then trim cut processing is performed, and a locating cap for locating the trim cut mold is formed into a press molded product, and the press molded product and the upper mold are detached. For mold operation, on both sides of the pin of the molding upper mold, since the plunger that presses the press molded product downward is provided, even if resistance occurs between the press molded product and the pin after press molding, Since the plunger presses the press-molded product in the mold release direction, there is no defective sticking of the press-molded product to the molding upper mold, the mold removal operation can be performed smoothly, and workability is remarkably improved. An effect that can be.

  Hereinafter, a method for forming a press-formed product and an embodiment of a molding die according to the present invention will be described in detail with reference to the accompanying drawings when applied to a method for manufacturing a roof trim. 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. FIG. 1 is a plan view of a room trim manufactured by applying the method of the present invention as seen from the indoor side, and FIG. 2 shows the configuration of the roof trim. FIG. 3 is an explanatory view showing an outline of the manufacturing method of the roof trim, FIG. 4 is a side view of a molding die used in the press molding method according to the present invention, and FIG. 5 is a top view of molding in the molding die. FIG. 6 is an explanatory view showing the mold surface shape of the mold, FIG. 6 is an explanatory view showing the pins and plungers provided on the upper mold of the molding die, and FIGS. 7 and 8 are explanatory views showing the press molding step and the demolding step, respectively. It is.

  1 and 2, the configuration of the roof trim 10 to which the method of the present invention is applied will be described. The roof trim 10 is attached to the indoor surface side of a roof panel (not shown) via a fixing means such as a clip (not shown), and has a resin core material 11 having shape retention and mounting rigidity with respect to the roof panel, and a resin core material. It is comprised from the two-layer structure with the skin 12 integrated on the surface of 11. As the resin core material 11, 50 parts by weight of polypropylene resin and 50 parts by weight of glass fiber are mixed and stirred, and then the sheet raw material extruded into a sheet shape by a T-die extruder is heat-softened and cold-press-molded. Is formed into a required shape, and then formed into a product form subjected to trim cut processing. Further, as the skin 12, a polyester cloth is used, and is integrally attached when the resin core material 11 is press-molded. In addition to the polypropylene resin material mixed with glass fiber, the material is not particularly limited as long as it is a material that can be thermoformed. For the skin 12, in addition to the polyester cloth, it is possible to use all the skin materials such as a sheet material such as a nonwoven fabric sheet, a thermoplastic resin sheet, and a fabric sheet, and a laminated sheet material lined with a cushion layer on the back surface of the sheet material. it can.

  Next, an outline of the manufacturing process of the roof trim 10 will be described with reference to FIG. First, an original fabric sheet S1 that is a material of the resin core material 11 and an original fabric sheet S2 that is a material of the skin 12 are prepared, and the raw fabric sheet S1 of the resin core material 11 is heated and softened to a predetermined temperature by the heater device H. Then, it is put into the press mold 20. The press molding die 20 is composed of a molding upper die 30 and a molding lower die 40. The molding upper die 30 can be moved up and down by a predetermined stroke by an elevating cylinder 31, and a pin is placed at a predetermined position on the periphery of the mold surface. 32 is fixed with its tip facing downward. When the press-molded upper and lower molds 30 and 40 are in the mold open state, the raw sheet S2 of the skin 12 is set on the mold surface of the lower mold 40 and then heated and softened on the upper side. The sheet S1 is set, and the press-formed product 50 is formed into a required shape by clamping the forming upper and lower molds 30 and 40, and the locating cap 51 is formed corresponding to the pin 32.

  Further, in order to trim-cut the product shape of the roof trim 10, the press-formed product 50 is set on the laser-cut die 60. At this time, the locating cap 61 in the press-formed product 50 is placed on the locating pin 61 of the laser-cut die 60. By inserting 51, the press-molded product 50 can be quickly and accurately set on the laser cut mold 60. If a trim cut process is performed along the product shape by a laser cut device (not shown), FIG. 1 and FIG. The roof trim 10 can be manufactured in a shape. A trim cutting device other than the laser cutting device can also be used.

  By the way, the method of the present invention relates to a method of forming the press-formed product 50 before the trim cut process, and the press-molding die 20 to be used is composed of an upper mold 30 and a lower mold as shown in FIGS. The molding upper mold 30 is configured to move up and down by a predetermined stroke by driving the elevating cylinder 31, and the mold surface of the molding upper mold 30 has pins 32 at six positions on the periphery thereof as shown in FIG. Is fixed. The pin 32 is set at a planned end material position (indicated by hatching in the drawing) located outside the trim cut line P that matches the product shape.

  More specifically, in the present invention, as shown in FIG. 6, the pin 32 is fixed to the molding upper die 30 by screwing a screw portion 32a, and plungers 33 are attached to both sides of the pin 32. It is embedded in a state in which the spring is always biased in the protruding direction by the spring 34. That is, in the molding process of the press-molded product 50, the plunger 33 is buried in the molding upper mold 30 as shown in FIG. On the other hand, at the time of mold opening after molding, as shown in FIG. 8, the press-formed product 50 is pressed downward to promote separation of the press-formed product 50. That is, if the raw sheet S2 of the skin 12 and the original sheet S1 of the resin core 11 are heat-softened, they are put into the press mold 20 and the upper and lower molds 30 and 40 are clamped. As shown, the press-molded product 50 can be formed into a required shape, and the locating cap 51 can be formed in accordance with the shape of the pin 32. Then, in the demolding step after molding, as shown in FIG. 8, if the upper mold 30 is raised, even if resistance between the press-formed product 50 and the pin 32 of the upper mold 30 is generated, the biasing spring is generated. Since the plunger 33 presses the press-formed product 50 downward by 34, the press-formed product 50 does not stick to the forming upper die 30 and can be dropped downward, and is press-formed to the laser cut die 60 in the next process. The product 50 can be supplied quickly, and the demolding operation can be carried out quickly and smoothly.

  The embodiment described above is applied to the press-molded product 50 before the laser cutting process of the roof trim 10, but is a molded product that requires laser-cut processing after the press molding. It can be applied to all integrated press-formed products.

It is the top view which looked at the roof trim manufactured by applying the method of the present invention from the indoor surface side. It is the II-II sectional view taken on the line in FIG. It is explanatory drawing which shows the outline | summary of the manufacturing process of the roof trim used as the application object of this invention method. It is explanatory drawing which shows the whole structure of the shaping die of the press molded product which concerns on this invention. FIG. 5 is a view taken in the direction of arrow A in FIG. 4 and is an explanatory diagram showing a mold surface shape of a molding upper mold in the molding die. It is explanatory drawing which shows the structure of the pin and plunger in the shaping die shown in FIG. It is explanatory drawing which shows the shaping | molding process of the press molded product which uses the shaping die shown in FIG. It is explanatory drawing which shows the demolding process of the press molded product which uses the shaping die shown in FIG. It is the top view seen from the room inner side which shows the conventional roof trim. FIG. 10 is a sectional view taken along line X-X in FIG. 9. It is explanatory drawing which shows the shaping die which shape | molds the conventional roof trim. It is explanatory drawing which shows the setting process to the laser cut type in the manufacturing method of the conventional roof trim. It is explanatory drawing which shows the malfunction in the shaping | molding method of the conventional roof trim.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Roof trim 11 Resin core material 12 Skin 20 Press molding die 30 Molding upper mold 31 Lifting cylinder 32 Pin 32a Screw part 33 Plunger 34 Energizing spring 40 Molding lower mold 50 Press molded product 51 Locating cap 60 Laser cut die 61 Locating pin S1 Original sheet (for resin core material)
S2 Original sheet (for skin)
P trim cut line

Claims (2)

The heat-formable raw fabric sheet (S1) is heat-softened and then charged into the molding upper and lower molds (30, 40), and the molded upper and lower molds (30, 40) are clamped to form a press-formed product (50). After that, this press-molded product (50) is set in a trim cut die (60), and a trim product (50) is trimmed along the product shape to produce an interior part (10). )
A locating cap (51) to be attached to the locating pin (61) of the trim cut mold (60) is formed at a predetermined peripheral portion of the press-formed product (50), and the press-formed product (50) is formed. A pin (32) for forming the locating cap (51) protrudes from the periphery of the mold surface of the upper mold (30) to be formed. On both sides of the pin (32), the press-formed product (50) is The plunger (33) that presses in the direction is urged downward, so that the press-molded product (50) is prevented from sticking to the molding upper mold (30) when the press-molded product (50) is removed. A method for forming a press-molded product. After heat-softening the heat-processable raw sheet (S1), it is put into the molding upper and lower molds (30, 40), and the press molded product (50) is clamped by the molding upper and lower molds (30, 40). After forming into the required shape, this press-molded product (50) is set on the trim cut mold (60), and press molding is performed when producing the interior part (10) that is trimmed along the product shape. In the press mold (20) for molding the product (50),
A pin (32) for molding a locating cap (51) to the press-molded product (50) is fixed to the peripheral edge of the molding upper mold (30) in the press-molding die (20). On both sides of the pin (32), the plunger (33) is urged downward, and when the press molded product (50) is molded, the plunger (33) is buried in the molding upper die (30). The moldability of the press-formed product (50) is ensured, and after molding, the both sides of the locating cap (51) are pressed downward by the plunger (33) by the spring pressure of the biasing spring (34), A molding die for a press-molded product, wherein the locating cap (51) is promoted to be disengaged from the pin (32) of the molding upper die (30).

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