JP2552475Y2 - Resin panel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a resin panel.

[0002]

2. Description of the Related Art As a resin panel, Japanese Utility Model Application Laid-Open No. 61-8
As disclosed in Japanese Patent No. 0151, in order to improve the rigidity of the resin panel, a ridge projecting in a U-shaped cross section in the front direction of the resin panel may be formed on a peripheral portion thereof.

[0003]

By the way, as described above, the protruding ridge is formed on the peripheral edge so as to protrude in a U-shaped cross section toward one of the front side and the back side of the resin panel. In the resin panel having a portion, usually, the surface of the resin panel on which the protrusion is not provided is opposed to the fixed cavity surface, and the surface of the resin panel on which the protrusion is provided. Is formed by filling a molding resin into a cavity formed by a fixed die and a movable die facing a cavity surface of the movable die.

Since the protruding ridge of the U-shaped cross section of the resin panel protrudes from the main body of the resin panel, the tip of the protruding ridge is provided inside the molding die and is provided in the cavity. It will be located far from the cooling pipe for cooling the filled molding resin. For this reason, the cooling rate of the molding resin is slower at the distal end portion of the ridge portion than at other portions (the flat portion of the resin panel), and as shown in FIG. 5 and FIG. 6) (the left and right directions in FIG. 6), the tip portion c of the ridge portion b shrinks in the ridge line direction after molding, so that the shape of the resin panel a is changed from the shape shown by the two-dot chain line to the shape shown by the solid line. Problem.

FIG. 5 shows a resin panel a in which a ridge b is formed over the entire peripheral edge, and FIG. 6 shows a panel VI-VI in FIG.
FIG. 3 is a sectional view taken along a line.

The ridges having a U-shaped cross section as described above are provided to improve the rigidity of the resin panel. However, when viewed from the side where the ridges protrude for aesthetic reasons. The width of the ridge portion is preferably small. For this reason, since the width of the projection formed on the fixed die of the molding die corresponding to the ridge of the resin panel is reduced, the projection is easily damaged and the durability of the molding die is not sufficient. There's a problem.

[0007] The present invention solves the above problems at once,
It is an object of the present invention to prevent a resin panel having a ridge having a U-shaped cross section from being shrunk after molding and to improve the durability of a mold for molding the resin panel.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a resin panel having a thickness of a leading end portion of a ridge portion formed on one surface of a resin panel so as to project in a U-shaped cross section. Is made thinner than the thickness of the other parts, so that the cooling rate of the molding resin at the time of molding is equal between the tip part of the ridge and the other part.

Specifically, the solution taken by the present invention is a resin panel having a ridge formed so as to protrude in a U-shaped cross section to one of the front side and the back side. The thickness of the tip portion of the ridge portion is such that the cooling rate of the molding resin at the tip portion at the time of molding is equal to the cooling rate of the molding resin at the other portion compared to the thickness of the other portions. The thickness is set to such a small thickness.

[0010]

According to the above construction, the cooling rate of the molding resin at the tip portion at the time of molding is made equal to the cooling rate of the molding resin at the other portions when the thickness of the tip portion of the ridge portion of the resin panel is formed. Since the molding resin is set to a very small thickness, the molding resin at the tip of the ridge is cooled at the same cooling rate as the molding resin of the other parts. Does not cause molding shrinkage.

[0011] Further, since the thickness of the tip portion of the ridge portion of the resin panel is set to be thinner than the thickness of the other portions, the ridge portion has the same outer dimensions as those provided with the ridge portion. Since the inner shape of the portion can be set large, the width of the protrusion of the molding die provided corresponding to the protrusion of the resin panel can be increased.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a license plate holder 10 as a resin panel according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a perspective view of a front portion of the mounted vehicle, and as shown in FIG. 3, a license plate holder 10 is mounted at a front central portion of a front bumper 12 of the vehicle.

As shown in FIGS. 1 and 2, the license plate holder 10 has a rectangular flat portion 14 and a flat portion 14.
A protruding portion 16 is provided at the periphery of the protruding portion and protrudes to the front side in a U-shaped cross section, and a peripheral end portion 18 is provided at the outer peripheral end of the protruding portion 16 and protrudes to the back side. A pair of left and right mounting holes 20 for mounting the number plate holder 10 to the front bumper 12 are provided at the center of the flat portion 14 in the vertical direction. A pair of left and right clip nut mounting seats 22 for mounting a plate mounting clip nut (not shown) is provided.

The feature of this embodiment is that the thickness of the tip portion 16a of the ridge 16 of the license plate holder 10 is larger than the thickness of other portions such as the flat portion 14, the peripheral end portion 18 and the like at the time of molding. The thickness of the molding resin 16a is set to such a small thickness that the cooling rate of the molding resin is the same as that of the other parts.

FIG. 4 shows a sectional structure of a molding die 24 for molding the license plate holder 10 according to the present embodiment. The molding die 24 has a cavity surface 26a having a shape corresponding to the back surface 10a of the license plate holder 10. Fixed die 26 and surface 1 of license plate holder 10
0b and a movable mold 28 having a cavity surface 28a of a shape corresponding to the movable mold 28. The fixed mold 26 has an injection hole 32 for injecting a molding resin into a cavity 30 formed by the fixed mold 26 and the movable mold 28. Is provided. Further, inside the fixed mold 26, fixed mold cooling pipes 34 for cooling the molding resin filled in the cavity 30 are provided substantially in a line along the cavity surface 26a,
A movable cooling pipe 36 for cooling the molding resin filled in the cavity 30 is provided inside the movable mold 28 along the cavity surface 28a.

For this reason, the license plate holder 10
The molding resin forming the tip portion 16a of the ridge portion 16 is located farther from the fixed cooling pipe 34 than the molding resin forming other portions such as the flat portion 14, the peripheral end portion 18, and the like. ing. However, since the thickness of the distal end portion 16a of the ridge 16 of the license plate holder 10 according to the present embodiment is set to be thin as described above, it is used for forming the distal end 16a of the ridge 16 during molding. Since the resin is cooled at the same cooling rate as the molding resin in the other portions, the molding does not shrink at the tip end 16a of the ridge portion 16 after molding, and does not deform due to molding shrinkage.

Further, since the tip portion 16a of the ridge portion 16 of the license plate holder 10 is formed to be thin, the inner dimension of the tip portion 16a becomes large, and the ridge portion 16 of the license plate holder 10 is formed. Therefore, the width of the tip of the projection 38 protruding from the fixed mold 26 is larger than that of the conventional one, so that the projection 38 is less likely to be damaged and the durability of the fixed mold 26 is improved.

In the above embodiment, the ridge 16 extends all around the periphery of the flat portion 14.
Instead, the ridge 16 may extend from one to three sides of the flat part 14.

[0020]

As described above, according to the resin panel of the present invention, the thickness of the tip portion of the ridge portion is compared with the thickness of the other portions, and the molding resin at the tip portion during molding is formed. The cooling rate is set so as to be the same as the cooling rate of the molding resin in other parts, so that the molding resin at the tip of the ridge has the same cooling rate as the molding resin in other parts. Therefore, the molding does not shrink at the tip of the ridge portion of the resin panel after the molding, and the resin panel does not shrink and deform.

Further, since the thickness of the tip portion of the ridge portion is set to be smaller than that of the other portions, the inner dimension of the ridge portion is made larger than when a ridge portion having the same outer dimensions is provided. It can be set and the width of the protrusion of the mold provided corresponding to the protrusion of the resin panel can be increased, so that the durability of the mold is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a license plate holder according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a front portion of a vehicle to which the license plate holder is attached.

FIG. 4 is a sectional view of a molding die for molding the license plate holder.

FIG. 5 is a plan view of a conventional license plate holder.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, showing contraction deformation in the conventional license plate holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Number plate 14 Flat part 16 Protrusion part 16a Tip part 18 Peripheral end part 26 Fixed type 28 Movable type 36 Projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A resin panel having a ridge formed so as to protrude in a U-shaped cross section to one of a front side and a back side. The thickness is set to a small thickness so that the cooling rate of the molding resin at the tip portion during molding is equal to the cooling rate of the molding resin at the other part at the time of molding as compared with the thickness of the other parts. A resin panel, characterized in that: