JPH0487852A - Moulding for automobile - Google Patents

Abstract

PURPOSE:To reduce the difference in expansion/contraction between the upper and lower sides separated with an insert by bonding foil on the surface of the main body of a moulding made of synthetic resin, burying the insert into the main body of the moulding on the opposite side of the foil, and forming a hollow part between the foil on the main body of the moulding and the insert. CONSTITUTION:Foil 2 having a metallic glossy surface and a nearly crescent- shaped section is bonded on the surface of the main body 1 of a moulding made of synthetic resin, and also an insert 3 made of a metal plate such as aluminum, etc., is buried in the opposite side of the foil of the main body 1 of the moulding. And, a hollow part 4 is formed on a position surrounded with the foil 2 and the recessed insert 3 of the main body 1 of the moulding. By forming the hollow part 4 like this, the difference in the wall thickness of the main body 1 of the moulding is reduced between the upper and lower sides separated by the insert 3, the difference in contraction between the upper and lower sides of the insert 3 is reduced, and the unbalance in the shrinkage percentage of the main body 1 of the moulding between the upper and lower sides of the insert 3 is corrected. And, the reduction in weight of the whole moulding is achieved by the existence of the hollow part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding for an automobile, and particularly to a molding for an automobile having a decorative foil such as a glitter film on the surface of the molding body.

[Prior Art] FIG. 6 is a sectional view showing a conventional automobile molding, and FIG. 7 is a longitudinal sectional view showing the automobile molding shown in FIG. 6 in a curved state.

In the figure, a foil 2 having a substantially half-moon cross section and having a metallic luster surface is bonded to the surface of a synthetic resin molding body 1 integrally molded by extrusion molding or the like.

This foil 2 is joined by integral molding at the same time as the molding body 1 is molded. An insert 3 made of a metal plate is embedded in the opposite foil side of the molding body 1. This insert 3 is also embedded by integral molding at the same time as the molding body 1 is molded. The insert 3 controls the overall length of the molding body 1 by regulating its longitudinal expansion and contraction, and also prevents the molding body 1 from warping or curving.

Conventional automotive moldings are configured as described above.
It is attached to the side of the car body as a decorative and protective member. That is, this type of automotive molding not only functions as a protective member to prevent damage to the side surfaces of the vehicle body, but also is used for decoration as a design accent on the exterior of the vehicle body. In recent years, in order to further improve the design, metal foils or metal plates that give off a metallic luster have been bonded to the surface of automotive moldings.

However, when the foil 2 is bonded to the surface of the molding body 1 as described above, a phenomenon occurs in which the entire molding is warped or curved, as shown in FIG. This is because, as the thermal conditions change during cooling after integral molding of the molding, differences in expansion and contraction occur due to differences in the thermal expansion coefficients of the materials in the longitudinal direction of the molding.

Therefore, as a means to prevent this warpage and curvature, Japanese Utility Model Application No. 57-63754 and Japanese Utility Model Application No. 58-20644 are proposed.
There is a technique described in Publication No. 2. All of these techniques use inserts.

[Problems to be Solved by the Invention] In the conventional automotive moldings as described above, in order to increase the attachment force of the foil 2, the cross-sectional shape of the foil 2 is usually made into a half-moon shape and joined. Further, an insert 3 was buried in the molding body 1 to manage the total length of the molding.

Therefore, the foil 2 having such a cross-sectional shape is attached to the molding body 1.
When bonded to the surface of the insert 3, the embedding position of the insert 3 was considerably restricted. That is, since the insert 3 comes into contact with the tip of the foil 2, the position of the insert 3 cannot be moved much toward the foil 2 side. Furthermore, since the cross-sectional area of the molding body 1 surrounded by the foil 2 and the insert 3 is large, there is a large difference in the cross-sectional area of the molding body 1 above and below the insert 3 as a boundary. In addition, foil 2 with a large shrinkage rate
When joining the molding body 1 to the surface of the molding body 1, the shrinkage force of this foil 2 is applied to the molding body 1 surrounded by the foil 2 and the insert 3.
It was transmitted directly to the upper surface of the insert 3 through the portion shown in FIG.

As a result, the molding body 1 suffers from a large warpage and a bending phenomenon in which the end portions jump up. That is, in this type of automotive molding, it has not been possible to correct the unbalance of the shrinkage rate only by using the insert 3.

As described above, in the conventional molding for an automobile of this type, the end part would jump due to the difference in shrinkage due to the difference in wall thickness between the upper and lower parts of the insert 3 and the shrinkage of the foil 2 on the upper surface. Furthermore, there is a limit to suppressing this warpage using only the insert 3. As a result, the entire molding was distorted, degrading its aesthetic appearance.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a molding for an automobile that does not cause warping or curving of the molding body even when a foil having a substantially semicircular cross section is bonded to the surface of the molding body.

[Means for Solving the Problems] The automotive molding according to the present invention includes a molding body made of synthetic resin, a foil bonded to the surface of the molding body,
The molding device includes an insert embedded in the side opposite to the foil of the molding body, and a hollow portion formed between the foil of the molding body and the insert.

[Function] In the present invention, a foil having a substantially semicircular cross section is bonded to the surface of a molding body made of synthetic resin, an insert is embedded in the side opposite to the foil of the molding body, and a hollow space is formed between the foil and the insert of the molding body. Since the molding body is formed with a section, the wall thickness of the molding body is equalized at the top and bottom of the insert, and the difference in shrinkage between the top and bottom of the insert can be reduced.Moreover, the hollow section makes it possible to It becomes difficult for the contraction horn to be transmitted to the top surface of the insert.

[Example] Examples of the present invention will be described below.

FIG. 1 is a sectional view showing an automobile molding according to a first embodiment of the present invention. In the drawings, the same reference numerals and the same symbols indicate constituent parts that are the same as or correspond to the constituent parts of the above-mentioned conventional example.

In the figure, as in the conventional case, a foil 2 having a semicircular cross section and a shiny metallic surface is bonded to the surface of a molding body I made of synthetic resin, and the opposite side of the molding body 1 is made of aluminum or the like. An insert 3 made of a metal plate is buried therein. In addition, in this embodiment, a hollow portion 4 is formed in a portion of the molding body 1 surrounded by the foil 2 and the insert 3.

In other words, the automotive molding of this embodiment has a configuration in which the hollow part 4 is added to the conventional automotive molding. By providing this hollow portion 4, the conventional disadvantages are corrected.

That is, in the past, there was a large difference in the cross-sectional area of the molding body 1 above and below the insert 3, which caused a large difference in shrinkage between the upper and lower parts of the insert 3, causing large warps and edges of the molding body 1. However, by forming the hollow part 4, the difference in wall thickness of the molding body 1 above and below the insert 3 as a boundary was reduced, and the shrinkage difference between the top and bottom of the insert 3 was reduced. , it is possible to correct the imbalance in the shrinkage rate of the molding body 1 above and below the insert 3.

Further, by forming the hollow portion 4, even when a foil 2 having a high shrinkage rate is bonded to the surface of the molding body 1, a large amount of the shrinkage force of the foil 2 is not directly transmitted to the upper surface of the insert 3. That is, the contraction force of the insert 3 is only slightly transmitted to the upper surface of the insert 3 via the molding body 1 around the hollow part 4.

Furthermore, by forming such a hollow portion 4, the material of the molding body 1 can be reduced, and the weight of the entire molding can be reduced at the same time.

In this embodiment, the insert 3 can prevent the entire length of the molding from shrinking due to contraction of the molding body 1 and the foil 2, so the entire length of the molding can be controlled.

As described above, in the automotive molding of this embodiment, a foil 2 having a substantially semicircular cross section is bonded to the surface of a molding body 1 made of synthetic resin, and an insert 3 is embedded in the side opposite to the foil of the molding body 1.
A hollow portion 4 is formed in a portion of the molding body 1 surrounded by the foil 2 and the insert 3.

Therefore, the wall thickness of the molding main body 1 is equalized above and below the insert 3 as a border, and the difference in shrinkage between the top and bottom with the insert 3 as a border can be reduced, and the shrinkage force of the foil 2 is reduced by the hollow part 4. Since it is difficult to transmit the heat to the upper surface of the insert 3, it is possible to suppress the occurrence of a large warp in the molding body 1 or a bending phenomenon in which the end portion jumps up. This is particularly effective when bonding the foil 2 with a large shrinkage force to the surface of the molding body 1. Further, the hollow portion 4 allows the material of the molding body 1 to be reduced, and the weight of the entire molding can be reduced at the same time, and the insert 3 allows the entire length of the molding to be controlled.

As a result, the entire molding does not become distorted and the aesthetic sense is not spoiled, unlike in the conventional case.

Next, this second embodiment will be explained.

FIG. 2 is a sectional view showing a molding for an automobile which is a second embodiment of the present invention. In the drawings, the same reference numerals and symbols as in the embodiment of FIG. 1 above indicate constituent parts that are the same as or correspond to the constituent parts of the embodiment of FIG. 1.

In FIG. 2, the hollow part 4 is divided into two hollow parts 4 by the wall 5.
It is divided into. The rest of the structure is the same as in FIG. 1 above. That is, the automobile molding of this embodiment has a structure in which a wall 5 is added to the hollow portion 4 of the automobile molding of the embodiment shown in FIG.

By providing this wall 5, the molding body 1
By forming the hollow portion 4 in the molding, a decrease in the rigidity of the entire molding is prevented.

Particularly in the case of an automobile molding in which the cross-sectional area of the part of the molding body 1 surrounded by the foil 2 and the insert 3 is large, the hollow part 4 must also be large, so a wall 5 is provided to increase the rigidity. can be used to increase strength. Moreover, since the cross-sectional shape of the molding can be maintained by this wall 5,
It is possible to prevent the cross-sectional shape of the molding from being distorted when joining the foil 2,
The work of joining the foils 2 becomes easier. Note that the number of walls 5 is not limited to one, and a plurality of walls 5 may be provided depending on the size of the hollow portion 4.

FIG. 3 is a sectional view showing an automobile molding according to a third embodiment of the present invention. In the figures, the same reference numerals and symbols as in the embodiment of FIGS. 1 and 2 above indicate constituent parts that are the same as or correspond to the constituent parts of the embodiment of FIGS. 1 and 2.

In FIG. 3, a lightweight foam made of vinyl chloride or the like is injected into the hollow portion 4 as a filling member 6. As shown in FIG. The rest of the structure is the same as in FIG. 1 above. That is, the automobile molding of this embodiment has a structure in which a filling member 6 is added to the hollow portion 4 of the automobile molding of the embodiment shown in FIG. By injecting this filling member 6, a decrease in shape retention force caused by forming the hollow portion 4 in the molding body 1 is prevented.

That is, if the hollow part 4 is provided in the part of the molding body 1 surrounded by the foil 2 and the insert 3, the resistance force of the molding itself against the external force from the outside of the foil 2 decreases, and the cross-sectional shape of this automotive molding cannot be maintained. Sometimes. Therefore, by injecting a filling member 6 into the hollow portion 4, the retention force of the shape of the automobile molding is increased. Moreover, by using an extremely lightweight foam as the filling member 6,
Since the increase in weight of the entire molding can be suppressed to a small amount, and the shrinkage force of the foil 2 is not transmitted within the filling member 6,
The effects obtained with the configuration of the embodiment shown in FIG. 1 are not significantly reduced. In this embodiment, the filling member 6 is injected into the hollow part 4 of an automobile molding having one hollow part 4, but it may be combined with the structure shown in FIG. 2 above. That is, the filling member 6 may be injected into the hollow part 4 of an automobile molding having a plurality of hollow parts 4 as shown in FIG.

In addition, in the embodiment shown in FIGS. 2 and 3, a foil 2 having a substantially half-moon cross section is bonded to the surface of the molding body 1 made of synthetic resin, as in the embodiment shown in FIG. An insert 3 is embedded in the opposite foil side of the molding body 1, and a hollow portion 4 is formed in a portion of the molding body 1 surrounded by the foil 2 and the insert 3. Therefore, the difference in shrinkage between the upper and lower sides of the insert 3 can be reduced, and the shrinkage force of the foil 2 is difficult to be transmitted to the upper surface of the insert 3 due to the hollow part 4, so that the molding body 1 can be prevented from having large warps or edges. It is possible to suppress the occurrence of a curved phenomenon in which the curve jumps. Further, the material used for the molding body 1 can be reduced, and the weight of the entire molding can be reduced at the same time, and the entire length of the molding can be controlled by the insert 3.

As a result, it is possible to prevent distortion from occurring in the entire molding, and the aesthetic appearance is improved.

Next, the molding of the automotive molding of each of the above embodiments will be explained. FIG. 4 is a plan view showing an automobile molding molding apparatus according to an embodiment of the present invention, and FIG. 5 is a side view showing an automobile molding molding apparatus according to an embodiment of the present invention.

4 and 5, the material for the molding body 1 is injected into the extruder 11 from the material injection port 12. The material extruded from this extruder 11 is transferred to the adapters 1B, 1
4.15, it is sent to a die 16, and from the die 16 it is extruded outside into a molding body 1 having a predetermined cross-sectional shape.

At this time, a hollow portion 4 is formed in the molding body 1, and the insert 3 is embedded in the molding body 1. Further, the foil 2 is also supplied from the foil roll 20 to the upper surface of the molding body 1 and joined.

In this type of molding device, the insert 3 before being buried is an insert roll 30, and the roll direction is such that the curvature of the molding body 1 is suppressed. Therefore, by embedding such an insert 3 in the molding body 1, the restoring force of the insert 3 acts on the molding body 1, which contributes to suppressing the warpage that occurs in the molding body 1 and the bending phenomenon in which the end part jumps up. ing.

That is, if such a molding device is used, in each of the above embodiments, forming the hollow portion 4 in the area surrounded by the foil 2 and the insert 3 of the molding body 1 will result in the molding of the insert 3, which cannot be completely eliminated. It is possible to further correct the imbalance in the vertical shrinkage rate of the molding body 1, and prevent warping and curving of the molding body 1.

By the way, although the foil 2 bonded to the surface of the molding body 1 in the above embodiment has a substantially half-moon cross section, the present invention can be applied to other shapes as well. .

The insert 3 embedded in the anti-foil side of the molding body 1 in the above embodiment may be explained in the case where it is embedded in the molding body 1, or if the present invention is implemented, the insert 3 embedded in the opposite foil side of the molding body 1 may be Since the expansion/contraction force on the second side can be reduced, the insert 3 can be buried so that one side is exposed.

Further, in the above embodiment, the foil 2 is joined in such a manner that most of it is exposed, but when carrying out the present invention, it is also possible to configure the joining in such a way that the central part is exposed and both ends are buried. .

Furthermore, although the hollow portion in the above embodiment is formed at a position surrounded by the foil and insert of the molding body, when implementing the present invention, the hollow portion is formed between the foil of the molding body and the insert. It is sufficient to form a section.

[Effect of the Invention J As described above, the automotive molding of the present invention has a foil bonded to the surface of a molding body made of synthetic resin, an insert embedded in the side opposite to the foil of the molding body, and a molding that is bonded to the foil of the molding body. By forming a hollow part between the insert and the molding body, the wall thickness of the molding body is equalized between the upper and lower parts of the insert, which makes it possible to reduce the difference in expansion and contraction between the upper and lower parts of the insert. Since the shrinkage force of the foil is difficult to be transmitted to the upper surface of the insert by the portion, it is possible to suppress the occurrence of warpage or curvature of the molding body.

Moreover, since the entire length of the molding can be controlled by the insert, distortion of the entire molding can be prevented and the aesthetic appearance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a molding for an automobile which is a first embodiment of the present invention, FIG. 2 is a sectional view showing a molding for a motor vehicle which is a second embodiment of the invention, and FIG. FIG. 4 is a sectional view showing a molding for an automobile according to a third embodiment; FIG. 4 is a plan view showing a molding apparatus for a molding for an automobile according to an embodiment of the present invention;
FIG. 5 is a side view showing a molding device for an automobile molding according to an embodiment of the present invention, FIG. 6 is a sectional view showing a conventional automobile molding, and FIG. 7 is a state in which the automobile molding shown in FIG. 6 is curved. FIG. In the figure, 1: molding body 2: foil 3: insert 4: hollow part 5: wall 6: filling member 11: extruder 2o: foil roll 30: insert roll. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Patent applicant: Toyoda Gosei Co., Ltd. Agent: Patent attorney: Takehisa Higuchi (1 person) Figure 2 of the mall body

Claims (1)

[Scope of Claims] A molding body made of synthetic resin, a foil bonded to the surface of the molding body, an insert embedded in the side opposite to the foil of the molding body, and between the foil and the insert of the molding body 1. A molding for an automobile, comprising: a hollow portion formed in a hollow portion;