JP2835278B2 - Automotive exterior parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle exterior component mounted on an outer surface of a vehicle, and can be used for a side molding or the like mounted on a side portion of a vehicle.

[0002]

2. Description of the Related Art Generally, various parts for decoration or protection are mounted on the outer surface of an automobile. FIG. 12 shows a cross section of a side molding 90 which is one of such exterior parts for automobiles. The side mall 90
It is a component mounted on the side surface portion 91 of the automobile, and has a long shape that is continuous in a predetermined direction. FIG. 12 is a cross section of the long side molding 90 orthogonal to the longitudinal direction.

[0003] Thick portions 92 and 93 are formed at both ends along the longitudinal direction of the side molding 90, and a thin portion 94 is formed between the thick portions 92 and 93. Mounting surfaces 95 and 96 are formed on the back surfaces (sides facing the side surface portions 91) of the thick portions 92 and 93, respectively.
It is adhered and attached to the side surface portion 91 by the above method.

Conventionally, in molding a side molding 90 having such a cross-sectional shape, a cylindrical parison extruded from an extruder is sandwiched by a mold and compressed air is blown into the parison for molding. A blow molding method is employed. And the inside of the thick portions 92 and 93
Cavities 98A, 9 formed by blowing compressed air
8B. Also, in FIG.
In FIG. 4, the portion at the point K is welded, but the portion at the K point may not be welded and the cavities 98A and 98B may be connected to form one cavity.

[0005] On the other hand, in order to reduce the cost, it is desired to form the side molding by the blow molding method by the injection molding method. Of these, molding by a gas injection molding method (which may be referred to as a gas injection injection molding method or a hollow injection molding method) in which deformation or warpage of a molded article does not particularly occur is strongly desired. The gas injection molding method is a method of filling a molten resin into a cavity of a mold, injecting a pressurized gas, and performing injection molding while forming a gas channel through which the pressurized gas passes inside the molten resin ( See JP-A-3-138126).

[0006]

By the way, in molding a side molding having a cross-sectional shape similar to the side molding 90 of FIG. 12, that is, a side molding having thick portions formed at both end edges along the longitudinal direction, When the gas injection molding method is used, the inside of the thick portions at the upper and lower edges (FIG. 12)
In general, gas channels are formed in the respective cavities 98A and 98B).

However, there is a problem that it is difficult to form two gas channels of a desired length inside the molded product every shot by branching the gas to both sides. That is, since the state of spread of the filling resin varies from shot to shot, a phenomenon in which gas is injected into only one side may occur.

Further, when gas channels are formed on both sides, the gas channels are formed in a thick portion to serve as a flow leader (act as an internal runner to assist the resin flow). Weld (a thin line formed where two or more flows of molten resin meet)
And the appearance of the product is degraded.

On the other hand, in the case of a side molding having one gas channel, there is only one thick portion, so that two upper and lower mounting surfaces 95 such as the side molding 90 in FIG. , 96 cannot be provided, resulting in a problem that the bonding area is insufficient and the bonding strength of the side molding to the vehicle body is reduced.

An object of the present invention is to provide an automobile exterior part which has a good appearance, can secure a sufficient adhesion area to the outer surface of the automobile, and does not undergo deformation or warping after molding.

[0011]

SUMMARY OF THE INVENTION The present invention achieves the above object by securing a plurality of mounting surfaces with one gas channel and a plurality of ribs. In particular,
The present invention is a long automotive exterior component having a plurality of mounting surfaces mounted on the outer surface of an automobile and continuous in a predetermined direction formed by gas injection molding, wherein One is provided in a thick portion in which a single gas channel running in the longitudinal direction is formed, and all the remaining of the plurality of mounting surfaces are formed by respective end faces of a plurality of ribs arranged side by side. It is characterized by having been done.

Here, the plurality of ribs arranged side by side may be ribs arranged in a comb shape, ribs arranged in a lattice shape (for example, in the case of FIG. 7 described later), etc. (For example, in the case of FIG. 8 described below), and radially or annularly arranged ribs (for example,
This includes all of the elements arranged at appropriate intervals, such as the case of FIG. 9 described below. Also, the plurality of ribs
It is not necessary to arrange them completely continuously, and they may be arranged intermittently or intermittently (for example, in the case of FIG. 10 described later). Further, the number of mounting surfaces formed by the end surfaces of the plurality of ribs arranged in a row is not limited to one, and a plurality of mounting surfaces may be formed (for example, in the case of FIG. 11 described later).

[0013] Further, the automotive exterior part according to the present invention is arranged such that each of the plurality of ribs is oriented in a direction substantially orthogonal to the longitudinal direction, and the plurality of ribs are substantially the same length in the longitudinal direction. , And are arranged in a comb shape at substantially equal intervals. Further, the exterior part for an automobile according to the present invention is characterized in that the thick portion and the plurality of ribs arranged side by side are provided at both end edges along a longitudinal direction. The automobile exterior parts described above can be applied to a side molding or a side protector mounted on a side surface of an automobile.

[0014]

According to the present invention, a long automotive exterior component having a plurality of mounting surfaces (surfaces mounted on the outer surface of the vehicle) is formed by gas injection molding. On this occasion,
The plurality of mounting surfaces are secured by a thick portion in which one gas channel running in the longitudinal direction is formed and each end surface of the plurality of ribs arranged side by side.

For this reason, since a plurality of mounting surfaces are ensured by one gas channel without forming two gas channels, weld and gloss unevenness are not generated in the molded automotive exterior parts. Therefore, the appearance is improved as compared with the case where two gas channels are formed.

Further, in addition to securing one mounting surface by the thick portion where one gas channel is formed, another mounting surface is secured by each end surface of the plurality of ribs.
A sufficient bonding area to the outer surface of the automobile is ensured, and the bonding strength is improved.

Furthermore, since molding is performed by gas injection molding, no deformation or warpage of the molded product occurs, and the occurrence of defective products is suppressed as compared with the case of normal injection molding without gas injection. As a result, the product yield is improved. Further, since it is not necessary to form two gas channels, a phenomenon that gas is not injected into one side, which occurs when the gas is branched and two gas channels are formed, does not occur. A molded article without deformation or warpage can be obtained, and thereby the above-mentioned object is achieved.

Further, each of the plurality of ribs is arranged so as to be oriented in a direction substantially perpendicular to the longitudinal direction, and the plurality of ribs are comb-shaped at substantially equal intervals over substantially the entire length in the longitudinal direction. By arranging, the bonding area is more reliably secured, and the bonding strength is further improved.

Further, if a thick portion and a plurality of ribs arranged side by side are provided at both end edges along the longitudinal direction,
The exterior parts for automobiles have a simple structure, and a sufficient bonding area is secured even with such a simple structure.

[0020]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a side molding 10 which is an exterior part for an automobile according to the present invention, as viewed from the back side. The side molding 10 is a molded product formed by gas injection molding attached to a side surface of an automobile (not shown), and has a long shape continuous in the X direction in FIG. A thick portion 11 is formed at an upper edge along the longitudinal direction of the side molding 10, and a rib structure portion 12 is formed at a lower edge. The thick portion 11 and the rib structure 12
A thin portion 13 is formed between the two.

The gas channel 1 is provided inside the thick portion 11.
4 are formed so as to extend along the longitudinal direction of the thick portion 11 and to reach the vicinity of the end positions on both sides in the longitudinal direction.
The gas channel 14 is a passage for a pressurized gas injected together with the filling of the molten resin.

The rib structure section 12 is provided with a plurality of ribs 20 arranged so as to be oriented in a direction orthogonal to the longitudinal direction (X direction in FIG. 1). The plurality of ribs 20 are arranged in a comb shape at substantially equal intervals over substantially the entire length in the longitudinal direction.

On the back side (the front side in FIG. 1) of the thick portion 11, there is provided a mounting surface 31 to be mounted on the side surface of the automobile. Further, another mounting surface 32 is formed by each end surface of the plurality of ribs 20 of the rib structure portion 12. The side molding 10 is mounted on the side surface of the vehicle by applying a double-sided tape to each of the mounting surfaces 31 and 32 or applying an adhesive.

A gas injection hole 15 communicating with the gas channel 14 is opened at an end of the mounting surface 31 at a position corresponding to a gate for injecting a pressurized gas provided in a molding die (not shown). Is formed. In the molding die for molding the side molding 10, the gate for filling the molten resin may also serve as the gate for injecting the pressurized gas, or they may be provided separately. . Also, a small space (sub cavity) for extruding a part of the molten resin, so-called spillover, may be appropriately provided outside the cavity of the mold to improve the moldability (Japanese Patent Application No. 5-35476). In this case, it is preferable that the spillover gate is disposed at a position corresponding to the mounting surface 31.

In this embodiment, the side molding 10 is formed by gas injection molding as follows. First, a molding die having a cavity having a shape corresponding to the outer shape of the thick portion 11, the rib structure portion 12, and the thin portion 13 is prepared. Next, the filling of the molten resin into the cavity of the mold is started, and after the filling is started, a pressurized gas is injected at an appropriate timing to form a gas channel 14 inside the thick portion 11 while melting. The resin is spread in the cavity. At this time, the molten resin is simultaneously spread to a portion forming the thin portion 13 and the rib structure portion 12 in the cavity, whereby the thick portion 11, the rib structure portion 12, and the thin portion 13 are integrally formed. . Thereafter, the molded side molding 10 is removed from the mold, and a double-sided tape is applied to each of the mounting surfaces 31 and 32, or an adhesive is applied, so that the side molding 10 is mounted on the side surface of the automobile.

According to this embodiment, the following effects can be obtained. That is, the mounting surface 31 is formed by the back side of the thick portion 11 in which one gas channel 14 is formed.
And a plurality of ribs 2 of the rib structure portion 12 are secured.
Since the mounting surface 32 is secured by the respective end surfaces of 0, the side molding 10 can be adhered to the side surface of the automobile at two places above and below, and a sufficient adhesion area can be secured, so that reliable adhesion can be performed. it can. Further, since the molding is performed by the gas injection molding method, the pressure bonding strength at the time of bonding the vehicle body can be improved and the reliable bonding can be performed as compared with the case of the molding by the blow molding method.

Further, since the mounting surfaces 31 and 32 can be secured at two upper and lower portions without forming two gas channels, one gas channel 1 is provided inside the molded product.
Since only 4 are formed, the molded side molding 1
It is possible to prevent weld and gloss unevenness from occurring at 0. Therefore, the appearance of the product can be improved as compared with the case where two gas channels are formed in molding the side molding.

Furthermore, since molding is performed by gas injection molding, deformation and warpage of the side molding 10 after molding can be prevented, and the occurrence of defective products can be suppressed as compared with molding by normal injection molding without gas injection. As a result, the yield of products can be improved.

When the upper and lower mounting surfaces are secured on the side molding 10, one of the mounting surfaces can be secured by the rib structure portion 12. Therefore, it is not necessary to form two gas channels. Since the phenomenon that gas is not injected into one side, which occurs when a gas channel is formed in a book, does not occur, a side molding 10 free from deformation and warpage can be obtained by this, and the product yield can be improved. Can be planned.

In order to confirm the effects of the present invention, the following comparative experiments were conducted. In Experimental Example 1 and Comparative Examples 1 and 2, polypropylene (trade name:
Idemitsu Polypro J-950H, MI = 20) and an injection molding machine (trade name: Mitsubishi 850MGW, 85) as a molding machine.
0 tons). [Experimental Example 1] In Experimental Example 1, the side molding 10 of the above embodiment was formed by gas injection molding. 2, the length of the side molding 10 in the longitudinal direction is about 1000 mm, the width of each of the mounting surfaces 31 and 32 is about 15 mm, and the overall size of the side molding 10 is as shown in FIG. The width dimension was about 70 mm. The molding conditions were a resin temperature of 220 ° C. and a mold temperature of 30 ° C. Comparative Example 1 In Comparative Example 1, as shown in FIGS. 3 and 4, a portion corresponding to the thick portion 11 of the side molding 10 of the above-described embodiment was formed by ordinary injection molding (injection molding without using gas). The side molding 40 in which the portions corresponding to the rib structure portions 12 were both solid thick portions 41 and 42 was formed. FIG. 3 is a view of the side molding 40 viewed from the back side,
FIG. 4 is a sectional view taken along line AA of FIG. The molding conditions were the same as in Experimental Example 1, with a resin temperature of 220 ° C. and a mold temperature of 3
0 ° C. [Comparative Example 2] In Comparative Example 2, FIG.
As shown in FIG. 6 and FIG.
A side molding 50 in which gas channels were formed also in a portion corresponding to the rib structure portion 12 of 0, that is, a side molding 50 having two gas channels 51 and 52 at both end edges along the longitudinal direction was formed. FIG. 5 is a view of the side molding 50 as viewed from the back side, and FIG. 6 is a cross-sectional view along the line BB of FIG. The molding conditions were the same as in Experimental Example 1, except for the resin temperature 2
The temperature was 20 ° C. and the mold temperature was 30 ° C.

[Experimental Results] In Experimental Example 1, the flow state (flow pattern) of the resin at the time of molding was as shown by the two-dot chain line in FIG. 2 described above, and no weld was generated. In addition, there was no deformation or warpage of the molded article after molding, and a sufficient adhesion area was secured. In Comparative Example 1, the bonding area was sufficiently ensured, but the molding after removal was performed even when the holding pressure was 70% or more (70% of the maximum injection pressure) or more for a long time (10 seconds or more) during molding. The product was deformed, resulting in a defective product. In Comparative Example 2, the adhesion area was sufficiently secured,
At the time of molding, the flow state (flow pattern) of the resin charged and supplied from the gate position 54 becomes the state shown by the two-dot chain line in FIG. 5, the flow of the thin portion becomes slow, and weld occurs at the center. The appearance of the product deteriorated. And even if the molding conditions were changed, the occurrence of weld could not be eliminated. From the results of these comparative experiments, it was found that the side molding, which is the automotive exterior part of the present invention, was excellent in appearance, adhesive strength, and prevention of defective products, and the effect of the present invention was remarkably shown.

It should be noted that the present invention is not limited to the above-described embodiment, but includes other configurations capable of achieving the object of the present invention. For example, the following modifications are also included in the present invention. That is, in the above embodiment, the rib structure 1
2 has a plurality of ribs 20 arranged in a comb shape, but the rib structure is not limited to such an arrangement of the ribs. For example, the rib structure portion is arranged in a lattice shape as shown in FIG. A plurality of ribs are arranged at appropriate intervals, such as each rib 60, each rib 62 arranged obliquely as shown in FIG. 8, and each rib 64 arranged radially or annularly as shown in FIG. That is, it is only necessary that the mounting surface can be formed by each end face of the plurality of ribs.

In the above embodiment, the plurality of ribs 20 are provided continuously at substantially equal intervals over substantially the entire length in the longitudinal direction of the side molding 10, but are provided continuously over substantially the entire length. For example, as shown in FIG. 10, a plurality of ribs 66 may be arranged intermittently or intermittently, or may be not at substantially equal intervals, but may be at intervals corresponding to, for example, required strength in each portion. May be provided.

Further, in the above embodiment, the rib structure 12
Is provided at one location, thereby forming one mounting surface 32. However, two or more rib structure portions may be provided to secure the mounting surface with each of them, for example, as shown in FIG. The rib structure portions 7 are formed on the upper and lower sides of a central thick portion 71 in which a gas channel 70 is formed.
2, 73 may be provided to secure a total of three mounting surfaces.

The resin material used in the present invention is not particularly limited as long as it is suitable for gas injection molding, such as polypropylene and polyethylene. Further, the pressurized gas used in the present invention is arbitrary as long as it is suitable for gas injection molding, such as an inert gas such as a nitrogen gas or an argon gas.

In the above-described embodiment, the side molding 10 is applied as the vehicle exterior part of the present invention. However, the side molding 10 is mounted on the outer surface of the vehicle, such as a side protector mounted on the side surface of the vehicle. The present invention can be applied to automobile exterior parts.

[0037]

As described above, according to the present invention, one mounting surface can be ensured by the thick portion in which one gas channel running in the longitudinal direction is formed, and each end face of the plurality of ribs is provided. Can secure a different mounting surface, so that a sufficient bonding area to the outer surface of the car can be ensured and the bonding strength can be improved. Also, since there is no need to form two gas channels, weld and gloss The occurrence of unevenness can be prevented, the appearance of the product can be improved, and since the molding is performed by gas injection molding, the molded article after the molding can be prevented from being deformed or warped.

Further, each of the plurality of ribs is arranged so as to be oriented in a direction substantially perpendicular to the longitudinal direction, and the plurality of ribs are comb-shaped at substantially equal intervals over substantially the entire length in the longitudinal direction. By arranging, there is an effect that the bonding area can be more reliably secured and the bonding strength can be further improved. Furthermore, if a thick part and a plurality of ribs arranged side by side are provided at both end edges along the longitudinal direction,
There is an effect that a sufficient bonding area can be secured with a simple structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention as viewed from the back side.

FIG. 2 is a rear view showing Experimental Example 1 of the embodiment.

FIG. 3 is a back view showing a comparative example 1 based on the prior art.

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

FIG. 5 is a back view showing a comparative example 2 based on the prior art.

FIG. 6 is a sectional view taken along the line BB of FIG. 5;

FIG. 7 is a rear view showing a first modification of the present invention.

FIG. 8 is a rear view showing a second modified example of the present invention.

FIG. 9 is a rear view showing a third modified example of the present invention.

FIG. 10 is a rear view showing a fourth modification of the present invention.

FIG. 11 is a rear view showing a fifth modified example of the present invention.

FIG. 12 is a sectional view showing a conventional example.

[Explanation of symbols]

 10 Side molding which is an exterior part for automobiles 11, 71 Thick part 12, 72, 73 Rib structure part 14, 70 Gas channel 20, 60, 62, 64, 66 Rib 31, 32 Mounting surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-321023 (JP, A) JP-A-57-167841 (JP, A) JP-A-4-339044 (JP, A) 19012 (JP, U) Japanese Utility Model 7-40131 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60R 13/04 B29C 45/00 B29C 49/06

Claims (4)

(57) [Claims] 1. A long automotive exterior component having a plurality of mounting surfaces mounted on an outer surface of a vehicle and continuous in a predetermined direction formed by gas injection molding, wherein: One is provided in a thick portion in which one gas channel running in the longitudinal direction is formed, and all the remaining of the plurality of mounting surfaces are end faces of a plurality of ribs arranged side by side. A car exterior part characterized by being formed by: 2. The exterior component for an automobile according to claim 1, wherein each of the plurality of ribs is disposed so as to be oriented in a direction substantially orthogonal to a longitudinal direction, and the plurality of ribs are arranged in a longitudinal direction. Characterized in that they are arranged in a comb at substantially equal intervals over substantially the entire length of the vehicle. 3. The automotive exterior component according to claim 1, wherein the thick portion and the plurality of ribs arranged side by side are provided at both ends along a longitudinal direction. Automotive exterior parts. 4. The exterior part for an automobile according to claim 1, wherein the exterior part is a side molding mounted on a side surface of the automobile.