JPH03224842A - Molding for automobile - Google Patents

Abstract

PURPOSE:To eliminate the warp and curvature of a molding and enable jointing of an end material in good appearance and in an easy way by forming a plurality of bases respectively in separate protrusion molding processes, engagingly locking the bases with each other, and then forming the end material at the end of one of bases via an injection molding process. CONSTITUTION:The first base 11 comprises synthetic resin molded with a protrusion process and has a groove 11a and an engagement part 11b at the engagement portion thereof. The second base 12 comprises synthetic resin molded with a protrusion process separate from the molding process of the first base 11, and is provided with an engagement portion having an engagement part 12a capable of engaging with the aforesaid engagement part 11b. Furthermore, a foil 2 similar to a conventional case is pasted to the surface of the second bass 12. On the other hand, a hollow part 4a is formed in an end material 4 for the insertion of the ends of the second base 12 and the foil 2. Furthermore, the end material 4 is molded at the end of the first base 11 via an injection molding process. According to the aforesaid construction, the occurrence of molding warp and curvature due to a secular change during manufacture can be eliminated, and the jointing of the end material 4 can be done in good appearance and easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a molding for an automobile, and in particular,
This invention relates to a long automotive molding covered with foil.

[Prior Art] Fig. 10 is a perspective view showing a conventional automobile molding.
Figure 1 is a sectional view showing the Yl-yt cross section of the automotive molding in Figure 10, and Figure 12 is the xt cross section of the automotive molding in Figure 10.
It is a sectional view showing an example of a -xt cross section. Further, FIG. 13 is a sectional view showing another example corresponding to the xt-xt cross section of the automobile molding shown in FIG. 10. FIG. 14 is a cross-sectional view showing the case where an automobile molding having the cross section shown in FIG. 13 is painted.

In the figure, 1 is a synthetic resin base material integrally molded by extrusion molding, and 2 is a band-shaped foil with a metallic luster surface attached to the longitudinal direction of the surface of the base material 1. It is attached by integral molding. Usually, this foil 2 is attached to the surface of the base material 1 in an inverted U shape with the tip of the cross section embedded. Reference numeral 3 denotes an insert made of a band-shaped metal material buried in the longitudinal direction of the base material 1. This insert 3 controls the overall length of the base material 1 by regulating its expansion and contraction in the longitudinal direction, and also prevents warpage and curvature of the entire molding. It is prevented. 4 is a terminal material made of synthetic resin molded by injection molding on both ends of the base material 1, 5 is a primer that increases the adhesion between the foil 2 and the insert 3 and the base material 1, and 6 is used when painting the base material 1. This is a masking tape that is attached to the surface of the foil 2 to prevent paint from adhering to it.

Conventional automotive moldings are configured as described above.
When the base material 1 is injection molded, the foil 2 is simultaneously attached by integral molding, and then the terminal material 4 is molded onto both ends of the base material 1 by injection molding.

This type of automotive molding is attached to the side surface of an automobile 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 particular, in recent years, in order to further increase the degree of decoration, foils or thin metal plates that give off a metallic luster have been attached to the surface of automobile moldings.

Incidentally, moldings for automobiles that place emphasis on both decorative and protective properties are also disclosed in Japanese Patent Application Laid-Open No. 58-221741 and Japanese Utility Model Application No. 57-165542.

[Problems to be Solved by the Invention] However, when the foil 2 is attached to the surface of the base material 1 as described above, a phenomenon occurs in which the entire molding is warped or curved. This was caused by a difference in expansion and contraction due to a difference in the coefficient of thermal expansion of the materials in the longitudinal direction of the mold due to changes in the thermal conditions during cooling after integral molding of the mold. For this reason,
Conventional moldings for automobiles of this type require inserts 3 to prevent warpage and curvature. That is, the insert 3 was buried in a symmetrical position with respect to the foil 2 to cope with the problem. Therefore, the manufacturing cost increased and the yield of the extrusion process was also poor.

In addition, since the terminal material 4 is molded by injection molding, if a slight error occurs in the bonding state between the injection mold, the base material 1, and the foil 2, the material of the terminal material 4 may appear on the upper surface of the foil 2. , so it didn't look good when completed. therefore,
It was necessary to reliably join the injection molding mold, the base material 1, and the foil 2 without any gaps, and precise dimension matching was required.

Furthermore, when painting the surface of the base material 1, as shown in FIG. 14, masking tape 6 is pasted on the top surface of the foil 2 before painting to prevent the paint from adhering to the top surface of the foil 2. By peeling off the masking tape 6 after painting is completed,
- Parts A and B indicated by the dotted chain lines were only painted. As described above, when painting, not only is the masking tape 6 required, but also the work process becomes complicated in terms of workability, leading to a rise in manufacturing costs.

Therefore, the present invention provides an automobile molding that does not cause warpage or curvature of the molding due to changes over time during manufacturing, so it is possible to join terminal materials easily and with good appearance, and also has good workability during painting. The challenge is to

[Means for Solving the Problems] The automotive molding according to the present invention includes a first base material made of synthetic resin formed by extrusion molding, and a mold made of synthetic resin formed from the first base material by extrusion molding in a separate process. At the time of each molding, these locking means are integrally formed at each locking portion of the first base material and the second base material, and the second base material is Foil is attached to the surface of the material by integral molding.

Then, a terminal member having a cavity into which the end of the second base material and the foil are inserted is molded onto the end of the first base material by injection molding, and these are integrally assembled.

[Function] In the automotive molding of the present invention, the second base material to which the foil is attached and the first base material that is interlocked with the second base material are formed in separate steps. Formed by extrusion molding, these are mutually locked via a locking means, and
Since the terminal material having a cavity is molded onto the end of the first base material by injection molding, the entire molding does not warp or curve due to changes over time during manufacturing, so the joining work of the terminal material is easy. In this case, the material of the terminal material will not be placed on the top surface of the foil, and even when painting, if it is painted before assembling the first base material and the second base material, 1, masking tape etc. Even if you do not use it, paint will not adhere to the surface of the foil.

[Embodiment] FIG. 1 is an exploded perspective view showing an automobile molding according to an embodiment of the present invention, and FIG.
FIG. 3 is an exploded sectional view showing an example of the X2-X2 cross section of the automobile molding shown in FIG. 1. In addition, FIG. 4 shows the X2-
FIG. 7 is an exploded sectional view showing another example corresponding to the X2 cross section. FIG. 5 is a cross-sectional view showing a case where an automobile molding having the cross section shown in FIG. 3 is painted. In the figure, numerals 1 to 5 are the same or equivalent components to those of the conventional example, so redundant explanation will be omitted here.

In the figure, 11 is a first base material made of synthetic resin formed by extrusion molding, and 12 is a second base material made of synthetic resin formed by extrusion molding in a separate process from the first base material 11. Each locking portion of the first base material 11 and the second base material 12 has locking means capable of locking each other. That is,
A groove portion 11a and a locking portion 11b are formed on the first base material 11, and a locking portion 12a is formed on the second base material 12. The second base material 12 is fitted into the groove 11a of the first base material 11, and the locking portion 11b of the first base material 11 and the locking portion 12a of the second base material 12 are connected to each other. The structure is such that they can be locked to each other. Note that these groove portions 11a1
and each locking portion 11b.

12a is formed by integral molding at the time of extrusion molding of each of the first base material 11 and the second base material 12.

Furthermore, a foil 2 similar to the conventional one is attached to the surface of the second base material 12 by integral molding. Furthermore, a cavity 4a is formed in the terminal material 4, into which the second base material 12 and the end portions of the foil 2 are inserted. The terminal material 4 having the cavity 4a is molded onto the end of the first base material 11 by injection molding.

The automotive molding of this example is manufactured by the following procedure. First, the first base material 11 made of synthetic resin is manufactured by extrusion molding, and at this time, the groove portions 11a and the locking portions 11b are also formed at the same time.

On the other hand, a second base material 12 made of synthetic resin is manufactured by extrusion molding in a process different from that of the first base material 11, and at this time, the locking portion 12a is simultaneously formed, and the second base material 12 is
The foil 2 is also integrally attached to the surface of the base material 12. Also,
A terminal material 4 having a cavity 4a is molded onto the end of the first base material 11 by injection molding. By assembling and integrating these components, the automotive molding of this embodiment is completed. That is, the second base material 12 is fitted into the groove 11a of the first base material 111, and the locking part 11b of the first base material 11 and the locking part 12a of the second base material 12 are locked. Then, the second base material 12 and the ends of the foil 2 are inserted into the cavity 4a of the terminal material 4 to complete the process. Note that the first base material 11, the second base material 12, and the foil 2 described above can be cut to any length after extrusion molding, so the total length after completion can be any length. It will become a mall for cars.

The automotive molding having the above configuration includes a first base material 11 that occupies most of the volume of the molding, and a second base material 12 that occupies a small volume of a part of the molding to which the foil 2 is attached. Since the molding is manufactured by extrusion molding in a separate process and assembled together, there is no effect of differences in expansion and contraction due to differences in thermal expansion coefficients of the materials in the longitudinal direction of the mold. Therefore, the entire molding does not warp or curve due to changes over time during manufacturing as in conventional moldings, so the insert 3 for preventing warp or curve is not necessarily required. Further, even if a dimensional difference occurs between the first base material 11 and the second base material 12 due to changes over time from the time of manufacture, the cavity 4 in the terminal material 4
a, the second base material 12 is the first base material 11
The entire molding does not warp or curve. Therefore, manufacturing costs are reduced and the yield of the extrusion process is improved. Moreover, even if the insert 3 is required to control the entire length of the molding, the insert 3 can be provided in the center of the first base material 11 as shown in FIG. becomes stable.

Furthermore, in the automotive molding having this configuration, the second base material 12
Before assembling the terminal material 4 to the first base material 11, the terminal material 4 is molded onto the end portion of the first base material 11 by injection molding. Therefore, even if a slight error occurs in the bonding state between the injection molding mold and the first base material 11, the material of the terminal material 4 will not be placed on the top surface of the foil 2 as in the past, and the Improves appearance.

Therefore, the work of joining the injection molding mold and the first base material 11 becomes easier than the conventional work.

Furthermore, in the automotive molding having this configuration, the first base material 1
1, the entire surface of the first base material 11 is coated, and then the second base material 12 and the foil are coated. 2 should be assembled. Therefore, it is not necessary to apply the masking tape 6 to the upper surface of the foil 12 before painting to prevent the paint from adhering to the upper surface of the foil 2 and to remove the masking tape 6 after painting is completed, as in the conventional art. As a result, the masking tape 6 is not only unnecessary, but also the work process is simplified in terms of workability, and manufacturing costs are reduced. Moreover, the painting is finished beautifully, and the foil 2
The boundary between the surface and the painted surface becomes clear.

As described above, the automotive molding of this embodiment is manufactured by extrusion molding in which the first base material 11 and the second base material 12 made of synthetic resin are each formed in separate steps, and the first base material 1
The first and second base materials 12 have locking means that can lock them to each other. Then, when molding this second base material 12, a foil 2 is attached to the surface thereof. Further, a terminal material 4 having a cavity 4a into which the end of the second base material 12 and the foil 2 can be inserted is molded onto the end of the first base material 11 by injection molding,
These are assembled together. Therefore, the insert 3 for suppressing warpage and curvature of the entire molding due to changes over time during manufacturing is not necessarily required. In addition, since the terminal material 4 can be joined only by joining it to the twenty-first base material 11, the joined portion of the terminal material 4 has a good appearance and is easy to work with. Furthermore, even when painting, if the first base material 11 is painted before assembling the first base material 11 and the second base material 12, the masking tape 6 is not required and the painting can be done. is easily and beautifully finished.

Next, another embodiment of the locking means formed at each locking portion of the first base material and the second base material of the automotive molding according to the embodiment of the present invention will be described.

FIG. 6(a) is an exploded cross-sectional view showing an example of the assembly of the automotive molding of the present invention, FIG. 6(b) is a cross-sectional view showing the state after assembly, and FIG. 7(a) is the present invention. FIG. 12B is an exploded cross-sectional view showing another example of assembly of the automotive molding according to the embodiment, and FIG. In the drawings, the same reference numerals as those in the conventional example and the embodiment of the present invention indicate the same or corresponding components, so redundant explanation will be omitted here.

In FIG. 6, 110 is the first base material 1 of the above embodiment.
This first base material 110 is manufactured by the same process as No. 1, and the first base material 110 has a groove 1130a and a locking part 110b formed as a loosely continuous surface. Reference numeral 120 denotes a second base material manufactured by the same process as the second base material 12 of the above embodiment, and belt-shaped locking parts 120a are provided at both ends of the second base material 120. It is formed along the longitudinal direction of the base material 120. and,
These groove portions 110a1 and each locking portion 110b, 120
a constitutes a locking means for locking the first base material 110 and the second base material 120 to each other. That is, by inserting the second base material 120 into the groove 110a of the first base material 110 in a strongly curved inverted U shape, and then releasing this restriction, the first base material 110 Locking part 1
The locking portion 120a of the second base material 120 is inserted into the second base material 10b, the first base material 110 and the second base material 120 are locked to each other, and the assembly work is completed.

In FIG. 7, reference numeral 111 is a first base material manufactured by the same process as the first base material 11 and 110 of each of the above embodiments, and this first base material 111 has a groove 111a and a groove 111a. The stop portion 111b is formed with a wider cross-sectional shape than the groove portion 11a4. 121 is the second base material 12.120 of each of the above examples
This is a second base material manufactured by a process similar to that of the second base material 121, and claw-like locking parts 120a are formed at both ends of the second base material 121 along the longitudinal direction of the second base material 121. ing.

These groove portions 111a and each locking portion 111
b and 121a constitute a locking means for locking the first base material 111 and the second base material 121 to each other.

That is, by inserting the claw-shaped locking portion 121a of the second base material 121 into the groove portion 111a of the first base material 111 with the width narrowed, the locking portion 111b of the first base material 111 is inserted.
The locking part 121a of the second base material 121 is locked, and the first
The base material 110 and the second base material 120 are locked to each other, and the assembly work is completed.

In addition, in each of the above embodiments, each locking means is
First base material 110, 111 and second base material 120, 12
1 by integral molding during each extrusion molding.

Also, in these embodiments, a foil 2 is provided on the upper surface of the second base material 120, 121.
is pasted in advance, and the terminal material 4 having the cavity 4a is also formed by injection molding on the end of the first base material 110°111, although not shown.

In this way, the shape of the locking means formed at each locking portion of the first base material and the second base material can be changed arbitrarily. In particular, in this example, since the first base material and the second base material are formed by extrusion molding, these locking means also extend along the extrusion direction of the first base material and the second base material. Can be formed continuously. Moreover, it is also possible to adopt a so-called undercut shape, which cannot be achieved with injection molding.

Next, an explanation will be given of an end structure of an automobile molding according to an embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of essential parts showing an example of an end portion of an automobile molding according to an embodiment of the present invention, and FIG. 9 shows another example of an end portion of an automobile molding according to an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of main parts. In the figure, the same reference numerals as those in the conventional example and examples above indicate the same or corresponding structural acid moieties.

In the figure, 13 is a filler inserted into the cavity 4a of the terminal member 4. This filling 13 reduces the volume of the cavity 4a, and prevents water from entering the cavity 4a during car washing or rain, and also prevents the water that has entered from coming into direct contact with the car body. do.

In this way, this type of automotive molding may adopt either the end structure as shown in FIG. 8 or the end structure as shown in FIG. 9.

As shown in FIG. 8, the terminal member 4 may be attached to the body of an automobile with the hollow portion 4a left as it is. In addition, when employing a molding having such an end structure, it is preferable to provide a drainage hole in the lower surface of the cavity 4a. With this configuration, even if water enters the cavity 4a during a car wash or when it rains, it will be directly discharged downward from the drain hole.

Therefore, drainage performance is good and electrolytic corrosion is less likely to occur.

Alternatively, as shown in FIG. 9, a filler 13 may be inserted into the cavity 4a7 of the terminal member 4 and then attached to the body of an automobile. If a molding with such an end structure is adopted, the cavity 4
There is no space for water to enter a during car wash or rain, and even if water does enter, the water will not come into direct surface contact with the car body. Therefore, similar to the above, drainage performance is good and electrolytic corrosion is less likely to occur.

[Effects of the Invention] As explained above, the automotive molding of the present invention includes a second base material to which foil is attached, and a first base material that is interlocked with the second base material. Each of these is formed by extrusion molding, which consists of separate steps, and these are mutually locked through a locking means, and a terminal material having a cavity is molded onto the end of the first base material by injection molding. Due to the simple structure, the molding does not warp or curve due to changes over time during manufacturing, so inserts for this purpose are not required, reducing manufacturing costs and improving the yield of the extrusion process. In addition, even if a dimensional difference occurs between the first base material and the second base material due to changes over time other than during manufacturing,
Since the terminal material has a cavity, the second base material slides on the first base material, and the molding body does not warp or curve.

Moreover, even when an insert is used, it can be provided in the center of the first base material, and the conditions during extrusion molding are stabilized. Furthermore, since the material of the terminal material does not rest on the upper surface of the foil during the joining work of the terminal material, the appearance of the joined portion of the terminal material is good and the workability is also good. Furthermore, when painting, if the painting is done before assembling the first base material and the second base material, there is no need for masking tape, etc., and the paint does not adhere to the surface of the foil. It is simple and can be finished neatly, so it is easy to work with and is economical.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an automobile molding according to an embodiment of the present invention, and FIG. 2 is a Y2 of the automobile molding shown in FIG. 1.
3 is an exploded sectional view showing an example of the X2-X2 section 9 of the automobile molding shown in FIG. 1; FIG. 4 is an exploded sectional view showing an example of the An exploded cross-sectional view showing another example corresponding to the cross-section, FIG. 5 is a cross-sectional view showing a case where an automobile molding having the cross-section of FIG. 3 is painted, and FIG. 6(a) is an embodiment of the present invention. FIG. 7(b) is an exploded cross-sectional view showing an example of the assembly of the automotive molding according to the present invention; FIG. 7(b) is a cross-sectional view showing the state after assembly; FIG. FIG. 8 is an exploded cross-sectional view showing another example of assembly; FIG. 8B is a cross-sectional view showing the state after assembly; FIG. FIG. 9 is an enlarged sectional view of a main part showing another example of the end portion of an automobile molding according to an embodiment of the present invention; FIG. 10 is a perspective view showing a conventional automobile molding; FIG. 11 is a sectional view showing an example of the Yl-Yl cross section of the automobile molding shown in FIG. 10, and FIG. 12 is a sectional view showing an example of the Xl-Xl cross section of the automobile molding shown in FIG.
Fig. 13 is a sectional view showing another example corresponding to the Xt-Xl cross section of the automobile molding shown in Fig. 10, and Fig. 14 shows a case where the automobile molding having the cross section shown in Fig. 13 is painted. FIG. In the figure, 2: Foil 4: Terminal material 4a: Cavity part 11: First base material 11a: Groove part
11b: Locking portion 12: Second base material 12a: Locking portion. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A first base material made of a synthetic resin formed by extrusion molding; a second base material made of a synthetic resin formed by extrusion molding in a separate process from the first base material; A locking means integrally formed at each locking portion of the first base material and the second base material during molding, and a foil stuck to the surface of the second base material; having a cavity into which the base material and the end of the foil are inserted;
A molding for an automobile, characterized in that the end portion of the first base material is provided with a terminal material made of synthetic resin molded by injection molding.