JP4798617B2 - Injection molded product - Google Patents

Description

  The present invention relates to an injection molded product, and more particularly to an injection molded product in which a design portion side and a back portion side are formed in series via a thin integral hinge.

  An injection-molded product is obtained by a known injection molding method in which a plastic made into a fluid state by heating is filled into a mold from a mold injection molding gate and cured, and then demolded to obtain a molded product. It is what The injection molded products are used in various applications such as automobile interior parts, exterior parts, and containers. Some injection-molded products are connected to each other through a thin integral hinge formed at the time of injection molding, and can be bent by the integral hinge.

  For example, as an injection-molded product for the vehicle side mudguard 50 shown in FIG. 6, in Patent Document 1, a mounting plate is formed at the lower end of a long main body via an integral hinge, and the mounting plate is formed by the integral hinge. It is shown that is bent. Moreover, as an injection-molded product such as a container, Patent Document 2 discloses a lid that can be opened and closed with an integral hinge.

  A conventional injection-molded product having an integral hinge is injected into one end connected to the integral hinge at the end opposite to the integral hinge (the end away from the integral hinge). The position of the molding gate is set. Therefore, the resin injected from the injection molding gate reaches the integral hinge part after filling the injection molding gate side member, and then fills the other member. At that time, the integral hinge is far from the injection molding gate, and the integral hinge is thin and the resin passage resistance is large. In addition, there is a problem that a stripe pattern (weld line) due to the flow of the resin tends to occur in the other member.

  On the other hand, it is conceivable to set the position of the injection molding gate at the position of the integral hinge and fill the resin from the position of the integral hinge toward the members on both sides. Since high resin passes through the integral hinge part first, the integral hinge is formed thicker than the set value, and not only the integral hinge but also the members on both sides cause variations in appearance and quality. Or the bendability of the integral hinge is inferior.

JP 2005-59811 A Japanese Utility Model Publication No.57-5523

  The present invention has been made in view of the above points, and has an object to provide an injection-molded product that has good folding properties of the integral hinge, good appearance and product quality on the side of the design portion, and is suitable for use as a side mudguard for vehicles. To do.

  The invention according to claim 1 is an injection molded product in which a thin integral hinge is formed over substantially the entire length of the product, and the design portion side and the back portion side are formed in series via the integral hinge. Is divided by a hole formed at a boundary position between the design part side and the back part side in the middle of the length direction, and a design separated from the integral hinge at the edge of the hole dividing the integral hinge The position of the injection molding gate is set on the part side.

  According to a second aspect of the present invention, in the first aspect, the injection molded product is for a side mudguard of a vehicle.

  According to the injection molded product of the present invention, the integral hinge is divided by a hole formed at a boundary position between the design portion side and the back portion side in the middle of the length direction, and the integral hinge is divided. Since the position of the injection molding gate is set on the edge of the hole on the side of the design part away from the integral hinge, at the time of injection molding, the resin from the injection molding gate divides the integral hinge. The holes prevent direct flow to the integral hinge and are first filled to the design part side, and then filled to the back side through the integral hinge. For this reason, the design part side is formed by filling high pressure resin from the injection molding gate, and it is difficult to generate filling defects that adversely affect the aesthetics of the product and stripes caused by the flow of the resin. . In addition, since the resin with high pressure from the injection molding gate is filled to the design part side and then flows to the back side through the integral hinge, the integral hinge part is filled with resin with high pressure immediately after injection. Therefore, it is possible to prevent the integral hinge from becoming thicker than the set value, thereby lowering the bendability and causing variations in quality. Moreover, since the integral hinge is divided by the hole, the bendability is further improved.

  In particular, the side mudguard for vehicles has a long overall product length, so it is easy to affect the bendability due to variations in the thickness of the integral hinge. Is done. Therefore, the injection-molded product of the present invention, which has good bendability of the integral hinge, appearance on the design portion side and product quality, is suitable as a vehicle side mudguard.

  1 is a perspective view of an injection-molded product according to an embodiment of the present invention, FIG. 2 is a rear view of the injection-molded product according to the embodiment, and FIG. 3 is a cross-sectional view taken along lines 3A-3A and 3B-3B in FIG. 4 is a view showing the flow of the resin from the injection molding gate with respect to the four parts in FIG. 2, and FIG. 5 is a sectional view showing the use state of the injection molded product according to the embodiment.

  The injection molded product 10 shown in FIGS. 1 to 3 is used as the vehicle side mudguard 50 shown in FIG. 6 and is mounted on the vehicle body panel between the front and rear wheels below the door.

  The injection-molded product 10 is molded by injection molding, and a thin integral hinge 11 is formed over substantially the entire length of the product, and a design portion side 21 and a back portion side 31 are interposed via the integral hinge 11. Is formed in a series.

  The integral hinge 11 is formed at the lower end of the design portion side 21 and is formed on one side by a hole 13 formed at a boundary position between the design portion side 21 and the back portion side 31 in the middle of the length direction. The integral hinge part 11a and the other-side integral hinge part 11b are divided.

  As shown in FIGS. 2 and 4, an injection molding gate position 15 is set on the edge of the hole 13 that divides the integral hinge 11 on the design portion side 21 away from the integral hinge 11. ing. In the example shown in the drawing, the integral hinge 11 is a thin wall having a substantially V-shaped groove formed on the back side. On the other hand, the hole 13 for dividing the integral hinge 11 is formed on the injection molded product 10. At the center in the length direction, it is formed in a substantially rectangular shape. Further, the position 15 of the injection molding gate is the back side 21 a of the design part side 21 at the edge of the hole 13, and the length of the hole 13 in the side 13 a of the design part that does not contact the integral hinge 11. It is set to the middle position in the vertical direction.

  The design portion side 21 is a portion constituting the outer surface side of the vehicle body. In the illustrated example, the design portion side 21 is formed at a plate-like body portion 22 having a substantially arc-shaped cross section that swells outward in the vertical direction, and at the end in the length direction thereof. A plurality of mounting clip seats 25 are formed at predetermined intervals on the back side 21a. A clip fitting hole 26 is formed in the side portion of the mounting clip seat portion 25. As shown in FIG. 5, an attachment clip 65 is fitted into the clip fitting hole 26, and the design portion side 21 is placed on the outer surface side of the vehicle body panel 61 below the door in the vehicle via the attachment clip 65. Is fixed.

  The back side 31 is connected to the design part side 21 via the integral hinge 11. The back portion 31 is composed of a plate-like body portion 32 having a substantially arc-shaped cross section that swells outward in the vertical direction, and an end plate portion 33 formed at the end portion in the length direction. As shown in FIG. 5, the back side 31 is bent to the back side 21 a of the design part side 21 by the integral hinge 11, conceals the hem 62 of the vehicle body panel 61, and covers the back side of the vehicle body panel 61. Locked. Therefore, it is not necessary to attach a separate member to the back side of the design part side 21 with a bolt or the like in order to conceal the hem 62 of the vehicle body panel 61, so that the part cost can be reduced and the workability can be improved. On the back side 31 a of the back side 31, that is, on the side facing the design portion side 21 when bent by the integral hinge 11, the end 31 b opposite to the integral hinge 11 is engaged with the vehicle body panel 61. A plurality of stopping pieces 35 are formed at predetermined intervals in the length direction of the back side 31.

  In the injection molded product 10, since the position 15 of the injection molding gate is set at the edge of the design portion side away from the integral hinge 11 in the hole 13, the injection molding gate 10 The resin injected from the position 15 into the mold (not shown) is obstructed by the hole 13 and is prevented from flowing directly to the integral hinge 11 side, and the design portion side as shown by the chain line P shown in FIG. It spreads to 21 and is filled. Thus, since the design part side 21 is formed by filling a resin with a high pressure immediately after injection, filling defects that adversely affect the aesthetics of the product, striped patterns (welds) caused by the flow of the resin, etc. It is difficult to cause the occurrence of the above. Further, the high pressure resin injected from the position 15 of the injection molding gate is filled into the design portion side 21 and then filled into the back portion side 31 through the integral hinge 11, thereby Since the integral hinge 11 and the back side 31 are formed, the integral hinge 11 is thickened by being filled with a high-pressure resin immediately after injection, or has a striped pattern (weld). There is no or little decrease in bending property, and there is little variation in quality. Further, even if a striped pattern (weld) is generated on the back side 31 due to the flow of the resin, the back side 31 is a portion hidden from the outer surface of the vehicle body, so there is no possibility of hindering the beauty of the product.

  The present invention is suitable as a side mudguard for a vehicle, but can also be applied to a box-shaped container including a lid and a main body, and other products.

It is a perspective view of the injection molded product which concerns on one Embodiment of this invention. It is a rear view of the injection molded product which concerns on the same embodiment. 3A-3A sectional view and 3B-3B sectional view of FIG. It is a figure which shows the flow of the resin from the gate for injection molding about 4 parts of FIG. It is sectional drawing which shows the use condition of the injection molded product which concerns on the same embodiment. It is a side view of the vehicle with which the side mudguard was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection molded article 11 Integral hinge 13 Hole 15 Position of injection molding gate 21 Design part side 31 Back part side

Claims (2)

In an injection molded product in which a thin integral hinge is formed over substantially the entire length of the product, and the design part side and the back part side are formed in series via the integral hinge,
The integral hinge is divided by a hole formed at a boundary position between the design portion side and the back portion side in the middle of the length direction,
An injection-molded article, wherein an edge of the hole for dividing the integral hinge is provided with a position of an injection molding gate on the side of the design portion away from the integral hinge. The injection molded product according to claim 1, wherein the injection molded product is for a side mudguard of a vehicle.

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