JP5588426B2 - Interior parts for vehicles and molding method thereof - Google Patents

Description

  The present invention relates to a synthetic resin vehicle interior part represented by a door trim and rear side trim of an automobile, and a molding method thereof.

  A door trim or rear side trim of an automobile is provided with an opening for a container as disclosed in Patent Document 1, for example, and a plurality of ribs are integrally formed around the opening on the back side for reinforcement. I am doing so.

JP 2010-241266 A

  The door trim and rear side trim are generally formed by mold press molding or injection molding.

  In this molding process, the molten resin supplied to the gate of the mold pre-flows into the cavity general part that molds the trim general part with low flow resistance. Subsequently, the molten resin flowing into the groove-shaped rib-corresponding cavity for forming the ribs and joining the rib-corresponding cavity joins the molten resin in the general cavity portion from the terminal side.

  At this time, the generated gas (air) in the rib-corresponding cavity is released to the molten resin in the general cavity portion at a stretch, leaving a gas emission trace in the general trim portion, resulting in poor appearance.

  As a countermeasure against this problem, gas is confined by connecting a plurality of groove-shaped rib-corresponding cavities so that the plurality of ribs are connected to each other, and release of gas from the terminal side is suppressed.

  However, since the ribs provided around the above-mentioned container opening are long, the amount of gas generated in the rib-corresponding cavity of the mold is increased accordingly. It was not possible to avoid molding defects due to the outgassing phenomenon.

  Therefore, the present invention provides an interior part for a vehicle that can be degassed from around an ejector pin at the time of molding, and can avoid molding defects due to the occurrence of gas emission marks in the vicinity of the ribs, and a molding method therefor.

  An interior part for a vehicle according to the present invention is an interior part for a vehicle made of synthetic resin in which a plurality of ribs are integrally formed on the back surface, and the plurality of ribs are connected to each other so that the connection part bites in a substantially arc shape. It is characterized in that the substantially arc-shaped connecting portion is formed into a shape and is an ejector portion where the outer surface of the connecting portion is in contact with the outer surface of the ejector pin of the mold during molding.

  The molding method of the present invention is a method of molding the above-described vehicle interior part, wherein the vehicle interior part is molded by mold press molding or injection molding, and the molding die includes a plurality of ribs. An ejector pin is arranged so as to bite into the connecting portion, and the generated gas in the molten resin is discharged to the outside of the mold from the clearance between the ejector pin and the mold.

  According to the vehicle interior part and the molding method of the present invention, the gas to be released from the rib-corresponding cavity of the mold to the cavity general part during the molding process of the vehicle interior part is generated between the ejector pin and the mold. It becomes possible to discharge to the outside of the mold from the pin movable clearance.

  As a result, it is possible to provide an interior part for a vehicle that can avoid occurrence of gas emission traces in the general part and has a good appearance.

The side view which looked at the interior parts for vehicles made into the object of the present invention from the back side. The enlarged view of the A range part of FIG. Cross-sectional explanatory drawing which shows the principal part of the shaping | molding die used for the shaping | molding method of this invention. Cross-sectional explanatory drawing which shows the comparative example of the shaping | molding die shown in FIG.

  Hereinafter, an embodiment of the present invention will be described in detail by taking a rear side trim as an example of a vehicle interior part.

  FIG. 1 shows a side view of the rear side trim 1 as seen from the back side. The rear side trim 1 is disposed on the side in the vehicle width direction of the rear part (including the luggage room) of the vehicle compartment of an automobile, and is integrally formed by mold press molding or injection molding with an appropriate synthetic resin material. .

  In a substantially lower half portion of the rear side trim 1, a container opening 2 generally called a side pocket is formed in a required length in the vehicle front-rear direction.

  The container is formed by bulging and molding the lower part from the lower edge of the opening 2 toward the interior of the vehicle interior so as to secure a volume of the required width in the vehicle width direction, with the lower edge of the opening 2 being the upper edge. By offsetting inward in the vehicle width direction, it is easy to store and take out articles.

  A rib 3 is provided on the periphery of the back side of the opening 2 to provide reinforcement measures. In particular, the lower part of the opening 2 bulges toward the passenger compartment as described above, and is caused by interference with the passenger. Since it tends to receive external force, the rigidity is enhanced as a plurality of intersecting rib structures.

FIG. 2 is an enlarged view of a portion in the range A of FIG. 1. The plurality of intersecting rib configurations described above extend in the vehicle front-rear direction along the lower edge of the opening 2 and are multistage in the vertical direction. and transverse ribs 3a of a plurality of elongated formed was constitute by a plurality of grating longitudinal ribs 3b ₁ and the terminal longitudinal rib 3b ₂ for connecting the transverse ribs 3a each other.

In the example shown in FIG. 2, the terminal vertical rib 3 b ₂ that joins the end of the horizontal rib 3 a is formed by connecting the connecting horizontal rib 3 d to the long horizontal rib 3 c that protrudes along the upper edge portion on the back surface side of the opening 2. Are connected through.

In the example shown in FIG. 1, the molten resin injection gate G in the molding die of the rear side trim 1 is set at a position near the lower side of a portion where a plurality of horizontal ribs 3 a, terminal vertical ribs 3 b _2, and connecting horizontal ribs 3 d are gathered. Thus, the molten resin can be properly distributed to every corner of each rib.

Therefore, by setting the injection gate G as described above, the terminal vertical rib 3b which is on the most downstream side with respect to the flow direction of the molten resin supplied from the injection gate G at the time of molding at the connecting portion between the vertical and horizontal ribs. ₂ and the connecting portions C and P between the connecting lateral ribs 3d are formed in a connecting shape that bites into a substantially arc shape, for example, a substantially 1/4 circular arc shape that protrudes inward. The connecting portions C and P correspond to the set positions of the ejector pins 15 in the molding die 10 to be described later, and serve as ejector portions where the peripheral surfaces of the ejector pins 15 are circumscribed.

Figure 3 is a main part of the mold 10 of the above Rya side trim 1, and specifically shows an enlarged shaped portion of the connecting portion C · P in the terminal longitudinal ribs 3b _2.

  The mold 10 includes a cavity mold 11 and a core mold 12. A cavity general portion 13 for forming a general portion of the rear side trim 1 is formed between the mold surfaces of the cavity mold 11 and the core mold 12. On the other hand, a groove-like rib-corresponding cavity 14 for forming the above-described ribs 3a to 3d is formed on the mold surface of the core mold 12.

The core mold 12 is provided with a plurality of ejector pins 15 for releasing (molding) the molded product through the mold surface, one of which is the terminal vertical rib 3b ₂ and the connecting horizontal rib 3d. Are set to portions corresponding to the connected portions C and P.

When injecting the injection gate G (see FIG. 1) melt into the mold from the resin P described above, the molten resin P is as indicated by the arrow A ₁ in FIG. 3 the cavity general portion 13 for molding the less trim general portion flow resistance To pre-flow.

Subsequently, it flows into the groove-shaped ribs corresponding cavity 14 for molding the ribs 3 a to 3 d, the rib corresponding molten resin P which prevails in the cavity 14 is a cavity the general portion as shown by the arrow A ₂ in FIG. 3 from the terminal 13 molten resin P is merged.

  At this time, in the process in which the above-described molten resin P merges, in the rib corresponding cavity 14, the generated gas (air) in the rib corresponding cavity 14 is pushed into the terminal side by the flowing molten resin P.

  An ejector pin 15 exists at the end of the rib corresponding cavity 14, and a movable clearance δ of the ejector pin 15 is set between the peripheral surface of the ejector pin 15 and the core mold 12. The above-described connecting portions C and P are formed by portions where the ejector pins 15 are dug.

Therefore, generated gas is pushed to the terminal side of the rib corresponding cavity 14 is discharged into the mold outside through the movable clearance δ of the ejector pin 15 as shown by an arrow B ₁ in FIG.

  As a result, it is possible to prevent the generated gas from being released from the end side of the rib-corresponding cavity 14 to the molten resin P in the cavity general portion 13, and to prevent the occurrence of gas emission traces in the trim general portion due to this discharge pressure. it can.

On the other hand, as in the comparative example shown in FIG. 4, when the ejector pin 15 does not exist at the end of the rib corresponding cavity 14, the molten resin P in the rib corresponding cavity 14 changes from the terminal side to the molten resin P in the cavity general portion 13. when confluent, release the generated gas into the cavity general portion 13 side as shown by the arrow B ₂ in the figure is performed once.

  For this reason, gas emission traces remain in the general trim portion, resulting in poor appearance.

  Therefore, according to the rear side trim 1 and the molding method thereof according to the present embodiment, the gas to be released from the rib-corresponding cavity 14 of the mold 10 to the cavity general portion 13 in the molding process of the rear side trim 1 is ejected. It can be discharged out of the mold 10 through a pin movable clearance δ between the pin 15 and the core mold 12.

  As a result, it is possible to provide the rear side trim 1 that can avoid the occurrence of gas emission traces in the general trim portion and has a good appearance. Further, since the connecting portions C and P are formed by the digging portion of the ejector pin 15, when the ejector pin 15 is raised during product demolding, the connecting portions C and P are directly pushed up so that the demolding property is good.

  In the above embodiment, the rear side trim has been described as an example. However, the present invention is not limited to this.

1 ... Rear side trim (vehicle interior parts)
2 ... Openings 3a to 3d ... Rib C / P ... Arc-shaped rib connecting portion 10 ... Molding die 11 ... Cavity die 12 ... Core die 13 ... Cavity general portion 14 ... Rib corresponding cavity 15 ... Ejector pin G ... Injection gate P ... Molten resin δ ... Pin movable clearance

Claims (2)

A vehicle interior part made of a synthetic resin in which a plurality of ribs are integrally formed on the back surface,
The plurality of ribs are connected to each other, and formed into a connection shape that bites the connection part into a substantially arc shape,
The vehicular interior part characterized in that the substantially arc-shaped connecting portion is an ejector portion in contact with the outer surface of a molding die ejector pin at the time of molding. The method for molding a vehicle interior part according to claim 1, wherein the vehicle interior part is molded by mold press molding or injection molding,
In the mold, an ejector pin is arranged so as to bite into the connecting part between the plurality of ribs,
A method for molding an interior part for a vehicle, wherein the generated gas in the molten resin is discharged to the outside of the mold from the clearance between the ejector pin and the mold.

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