JPH10258460A - Production of decorative molding for car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the peeling of a terminal piece from a molding main body and to improve the appearance of the molding main body by the unified feeling between the molding main body and its end part. SOLUTION: In a method for producing a car decorative molding, a synthetic resin film 30 is placed on a main body end part receiving jig 20 for molding the end part of a decorative molding main body 10 made of a synthetic resin having the attaching part 11 positioned on a car body side and the design part 12 positioned on an anti-car body side and the end part of the decorative molding main body 10 is placed on the main body end part receiving jig 20 and the synthetic resin film 30 at a predetermined position to be heated and, in the plasticized state of the end part of the decorative molding main body 10, the peelable synthetic resin film 30 is brought into contact with a part of the design part 12 to be pressed thereto to bond and mold the synthetic resin film 30 between the molding main body 10 and the main body end part receiving jig 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a decorative mall for an automobile, and more particularly to a method for manufacturing a decorative mall for an automobile in which the design portion of a decorative mall main body such as a side molding is improved in appearance.

[0002]

2. Description of the Related Art As a conventional car mall of this kind,
The technique shown in FIG. 5 is known.

FIG. 5 is a sectional view of an end of a conventional automobile molding.

In a conventional automobile molding, a terminal piece 2 is attached to an end face of a long molding body 1 via an adhesive 3.
Are formed by connection. Mall body 1 and terminal piece 2
As a molding material, polyvinyl chloride is inexpensive and has good moldability.

[0005] In manufacturing the automobile molding, a molding body 1 is formed by extruding polyvinyl chloride, an adhesive 3 is applied to an end face of the molding body 1, and an end of the molding body 1 is formed by injection molding. The terminal piece 2 is set in the mold 4, and in this state, a molten material of polyvinyl chloride is injected into the cavity 5 of the injection mold 4 to form the terminal piece 2. In this case, since the molten material of polyvinyl chloride is difficult to be fused to the solidified polyvinyl chloride molding body 1, the adhesive 3 is applied to the end face of the molding body 1 in advance before the injection molding of the terminal piece 2. I had to keep it.

A technique disclosed in Japanese Patent Application Laid-Open No. 63-151423 is also known as an automobile mall equipped with this type of terminal piece.

According to this type of conventional automobile molding,
In injection molding of the terminal piece 2, since a polyvinyl chloride molten material cannot be attached to the molding body 1 by fusion, it is necessary to apply the adhesive 3 to the end surface of the molding body 1 in advance, which increases the number of steps and complicates the process. There was an inconvenience. Further, when the terminal piece 2 is molded from polyvinyl chloride, not only the molding body 1 but also the terminal piece 2 is used in order to improve the adhesiveness of the double-sided adhesive tape attached to the back surface.
Also had the troublesome work of having to perform primer treatment.

Therefore, the applicant has previously provided the technique described in Japanese Patent Publication No. 8-6622 as a method that can omit the step of applying the adhesive and the adhesive, and the step of priming the terminal piece.

FIG. 6 is a sectional view of an end of a conventional automobile molding, and FIG. 7 is a rear view of the automobile molding of FIG.

When manufacturing a conventional automobile molding, the molding body 1 is formed into an elongated shape using an extruder, and the end of the molding body 1 and the core material 11 are set in an injection mold. In this state, the molten material of the polyester elastomer is injected into the cavity of the injection mold, and the core material 11 is formed.
Then, the terminal piece 2 including the shell material 12 is formed. Further, the core material 11 and the outer skin material 12 may be molded in two stages using separate injection molds. In any case, the molten material of the polyester-based elastomer is firmly adhered to the end face of the molding body 1 in the solidified state around the core material 11 by its own adhesive force.

As described above, the molding body 1 made of synthetic resin
And a terminal piece 2 made of a polyester elastomer connected to the end face of the molding main body 1 by injection molding. Since the polyester elastomer is used as a molding material of the terminal piece 2, injection molding of the terminal piece 2 is performed. At this time, the molten material of the polyester elastomer is firmly adhered to the end face of the molding body 1 by its own adhesive force. Further, in the case of a polyester elastomer, the double-sided adhesive tape 13 can be strongly adhered directly to the molding surface, so that there is no need to apply a special primer treatment to the terminal piece 2.

[0012]

However, the former decorative molding for automobiles, which comprises a molding body 1 made of synthetic resin formed by extrusion molding and a terminal piece 2 connected to the end face thereof by injection molding, is made of an adhesive. Terminal piece 2 with 3 as the boundary
May be peeled off. In particular, when the molding body 1 and the terminal piece 2 are distorted due to the injection pressure during injection molding,
Even if the terminal piece 2 is not separated, a discontinuous line may be generated on the design surface.

In the latter case, which is composed of a molding body 1 made of synthetic resin formed by extrusion molding and a terminal piece 2 made of a polyester-based elastomer connected to an end surface thereof by injection molding, the molding body 1 Because the terminal piece 2 and the terminal piece 2 do not have a sense of unity and the continuity of the design surface cannot be obtained, the appearance may not be good. In addition, the molding body 1,
When the terminal piece 2 is distorted, a discontinuous line may be generated on the design surface.

Therefore, the present invention provides a method of manufacturing a decorative mall for automobiles in which the terminal portion is not peeled off from the decorative mall main body and the appearance is improved by the sense of unity between the decorative mall main body and its end. The purpose is to provide

[0015]

According to the present invention, there is provided a method of manufacturing a decorative mall for an automobile, comprising the steps of: forming an end of a synthetic resin decorative mall body having a mounting portion located on a vehicle body side and a design portion located on a side opposite to the vehicle body; The synthetic resin film is placed on the main body end receiving jig to be molded, and the decorative mall main body end is placed on a predetermined position of the main body end receiving jig and the synthetic resin film. Heating, in a plasticized state of the decorative mall main body end portion, presses a peelable synthetic resin film on a part of the design portion, and adheres the synthetic resin film to the main body end receiving jig. In this way, the design surface is formed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a decorative mall for an automobile according to an embodiment of the present invention will be described.

FIG. 1 is a longitudinal sectional view showing a method of manufacturing a decorative molding for an automobile according to an embodiment of the present invention. FIG. 2 is a sectional view taken along a line A-- It is the expanded sectional view cut | disconnected by A. FIG. 3 is a longitudinal sectional view showing the method of manufacturing the automotive decorative mall according to the embodiment of the present invention. FIG. 4 is a sectional view taken along the line BB of FIG. It is the expanded sectional view cut | disconnected by.

In FIG. 1, a decorative molding body 10 made of polypropylene resin (PP) as a side molding body of the present embodiment is formed by extrusion molding, and has an embedded insert and no insert. Either may be used. Both sides in a direction perpendicular to the length direction of the decorative molding main body 10 are curved surfaces having a predetermined radius R as shown in FIG. The end 13 is cut at right angles to the length direction of the decorative molding main body 10. The mounting portion 11 located on the vehicle body side of the decorative mall main body 10 is a flat surface, and the design portion 12 located on the opposite side to the vehicle body has a curved surface with a radius R on both sides in a direction perpendicular to the length direction.
In addition, the end in the length direction of the decorative molding main body 10 of the present embodiment is finished with a curved surface having a radius r.

The main body end receiving jig 20 has an inner surface for finishing the longitudinal end of the decorative molding main body 10 into a curved surface having a radius r together with a synthetic resin film 30 described later. The end in the length direction is set to a radius r '(r <r') slightly larger than the radius r based on the thickness in consideration of the elongation during molding of the synthetic resin film 30. In addition, the end of the decorative molding body 10 in the direction perpendicular to the length direction also has a radius R ′ (R <R ′) slightly larger than the radius R based on the thickness in consideration of the elongation at the time of molding the synthetic resin film 30. However, the end opening side 22 of the main body end receiving jig 20 is more open than the end forming side 21.
Has a radius obtained by adding the thickness of the synthetic resin film 30 to the radius R. This curved surface gradually increases in radius from the end forming side 21 having the tip forming portion 25 to the end opening side 22. Is changing. At the same time, the width in the direction perpendicular to the length direction of the decorative molding main body 10 also gradually widens from the end forming side 21 to the end opening side 22. End forming side 2 of main body end receiving jig 20
At approximately the center of 1, there is a concave portion 23 which almost matches the shape of the end of the decorative molding main body 10. The depth is set in consideration of the thickness of the synthetic resin film 30, the side walls 24 of the main body end receiving jig 20 are formed at a predetermined inclination, the end open side 22 is shallow, and the end forming side is formed. 21 are formed so as to be deeply inclined. On the upper surfaces of the side walls 24, a pair of pressing elements 41 for pressing and fixing the placed synthetic resin film 30 on the upper surfaces of the side walls 24 at the time of vertical movement. The finishing of the inner surface of the body end receiving jig 20 may be lower in finishing accuracy than that of a mold for molding a general synthetic resin. Therefore, the cost of the body end receiving jig 20 makes the manufacturing cost inexpensive.

The synthetic resin film 30 of the present embodiment is
What is made of a long film of a saturated polyester resin (PET), which has been wound on an unused roll 31, passes through an upper portion of the main body end receiving jig 20 and is wound on a used roll 32. The synthetic resin film 30 has such a characteristic that it is difficult to extend in the length direction thereof and is easy to extend in the perpendicular direction thereof.

The ultrasonic horn 40 outputs ultrasonic waves from an ultrasonic welder (not shown). The ultrasonic horn 40 is a part of the concave portion 23 of the main body end receiving jig 20 and is provided with the decorative molding main body 1.
0 is sandwiched via the synthetic resin film 30. The distance L to be clamped varies depending on the thickness of the decorative molding main body 10, but is usually set so as to be heated and pressurized in the range of 5 to 30 mm after molding to form.

The vehicle decorative molding formed by the method for manufacturing a vehicle decorative molding according to the embodiment of the present invention is used as follows.

A synthetic resin film 30 is placed along the upper surface of both side walls 24 of the body end receiving jig 20. The synthetic resin film 30 composed of a long film is wound around an unused roll 31 so that the synthetic resin film 30 is wound around a used roll 32 for a distance slightly longer than the length used for molding. It moves from left to right in FIG. This timing moves when the synthetic resin film 30 placed on the upper surface of the both side walls 24 is not pressed and fixed on the upper surface of the both side walls 24 by the pair of pressers 41, and the synthetic resin film 30 is Immediately before pressing is fixed to the upper surface of both side walls 24, the movement is stopped. That is, the pair of pressing elements 41
Synthetic resin film 30
Is moved a predetermined distance from the left to the right in FIG.

Here, the synthetic resin film 30 placed on the upper surface of both side walls 24 is pressed and fixed by a pair of pressing elements 41. Then, the end 13 in the length direction of the decorative mall body 10
Is placed on the top of the tip forming portion 25 of the body end receiving jig 20, and the other direction of the decorative molding body 10 is placed in the direction of the end opening side 22. At this time, the decorative molding main body 10 is placed on the upper surface of the synthetic resin film 30 placed on the upper surface of the side walls 24. Here, the ultrasonic horn 40 that outputs ultrasonic waves from an ultrasonic welder (not shown) is turned downward, and the end 13 side in the length direction of the decorative molding main body 10 is pressed. Thereby, the pressing portion is melted, and the left side of the tip forming portion 25 in FIG. 1 becomes a surplus portion, presses the synthetic resin film 30, and the synthetic resin film 30 expands due to the pressing force and the melting temperature and is pressed downward. . On the right side of the tip forming portion 25 in FIG. 1 of the concave portion 23 of the main body end receiving jig 20, the pressing portion on the end 13 side in the length direction of the decorative molding main body 10 melts and presses the synthetic resin film 30. The synthetic resin film 30 expands due to its pressing force and melting temperature, is pressed downward, and expands.
0 follows the shape of the end forming side 21 of the main body end receiving jig 20. Accordingly, as shown in FIG. 3, the longitudinal end of the decorative molding main body 10 receives the energy of the ultrasonic horn 40 and the shape of the end forming side 21 of the concave portion 23 of the main body end receiving jig 20. Through the synthetic resin film 30, but the open end 2 of the concave portion 23 of the main body end receiving jig 20.
In No. 2, the shape does not change because the temperature has not risen.
That is, the longitudinal end of the decorative molding main body 10 is melted and softened by receiving the energy of the ultrasonic horn 40, and the synthetic resin film is formed into the shape of the end forming side 21 of the concave portion 23 of the main body end receiving jig 20. However, the degree of melt softening at this time is such that the end molding side 21 is in a more melt softened state and is away from the position of the ultrasonic horn 40,
The melt-softened state rapidly decreases. Synthetic resin film 30
Due to the pressing force of the ultrasonic horn 40 and the temperature of the decorative molding main body 10 melted and softened by receiving the energy of the ultrasonic horn 40, the decorative molding main body 10 expands at right angles to the length thereof. The surface of the decorative molding main body 10 is a smooth surface, and the smooth surface is transferred to the melted and softened decorative molding main body 10. At this time, the melt-softened decorative molding main body 10 is shaped by the smooth surface of the synthetic resin film 30 having the shape of the end forming side 21 of the concave portion 23 of the main body end receiving jig 20. The range of the decorative molding main body 10 to be determined is determined by the energy distribution from the ultrasonic horn 40 and does not change suddenly with a specific dimension, so that there is a streak between the shaped part and the unshaped part. Does not enter.

Preferably, the distance L between the decorative molding body 10 and the synthetic resin film 30 via the synthetic resin film 30 is set to a radius r 'slightly larger than the radius r based on the thickness in consideration of the elongation of the synthetic resin film 30 during molding. When set, it is a place where the continuity of the linear design surface 12 changes, and it does not stand out even if a slight discontinuity occurs. Also, the ultrasonic horn 4
By stopping and increasing the vibration energy from zero, the decorative molding main body 10 is rapidly cooled and hardened,
A predetermined end shape is obtained. After stopping and raising the ultrasonic horn 40 and cooling and curing the decorative molding main body 10, the decorative molding main body 10 is peeled off from the synthetic resin film 30. First, the pressing of the pair of pressing members 41, which previously held the synthetic resin film 30 between the upper surface of the both side walls 24 and the pair of pressing members 41, is released, and the synthetic resin film 30 is moved on the upper surfaces of the both side walls 24. Then, the material wound around the unused roll 31 is pulled out. Then, the other end of the decorative mall main body 10 is processed in the same manner.

In this way, the decorative molding main body 10 melted and softened is formed on the smooth surface of the synthetic resin film 30 having the shape of the end forming side 21 of the concave portion 23 of the main body end receiving jig 20. A curved surface having a radius r can be formed at the end of the decorative molding main body 10.

In the method of manufacturing a decorative mall for an automobile according to the present embodiment, the end of a synthetic resin decorative mall main body 10 having a mounting portion 11 located on the vehicle body side and a design portion 12 located on the opposite side of the vehicle body is formed. A positioning step of placing the synthetic resin film 30 on the main body end receiving jig 20 and placing the end of the decorative molding main body 10 at a predetermined position of the main body end receiving jig 20 and the synthetic resin film 30; The end portion of the molding body 10 is heated and the synthetic resin film 3 which can be peeled off a part of the design portion 12 in a plasticized state of the end portion of the decoration molding body 10.
And a film forming step of affixing the synthetic resin film 30 to the main body end receiving jig 20 by abutting and pressing 0.

Therefore, the longitudinal end of the decorative molding body 10 receives the energy of the ultrasonic horn 40,
It melts and softens and follows the shape of the body end receiving jig 20, but follows the shape of the body end receiving jig 20 via the synthetic resin film 30, and the synthetic resin film 30 is pushed by the ultrasonic horn 40. The decoration molding body 10 expands in a direction perpendicular to the length of the decoration molding body 10 due to the temperature of the decoration molding body 10 which is melted and softened by receiving the pressure and the energy of the ultrasonic horn 40.
The surface of the decorative mall main body 10 is a smooth surface,
The smooth surface is transferred to the melted and softened decorative molding main body 10, and the end of the decorative molding main body 10 is attached to the main body end receiving jig 2.
The shape is formed on the smooth surface of the synthetic resin film 30 having the shape of the end forming side 21 of the concave portion 23 of 0. At this time, the range of the decorative molding body 10 that melts and softens is determined by the ultrasonic horn 40.
Is determined by the energy distribution from the substrate and does not change sharply at a specific size, so that no streak is formed between the formed portion and the non-shaped portion.

Therefore, as in the prior art, the decorative molding body 1
Since the decorative mall main body 10 is shaped instead of joining the terminal piece to the decorative mall main body 10,
Without peeling off the ends of the decorative mall body 1
Due to the continuity between 0 and its end, a sense of unity is recognized, and the appearance of the design portion 12 is improved. Further, when the decorative molding main body 10 is melt-softened, the synthetic resin film 30 is formed on the smooth surface of the synthetic resin film 30 having the shape of the end forming side 21 of the concave portion 23 of the main body end receiving jig 20. At the same time, the end of the decorative mall body 10 is shaped,
The residual distortion of the decorative molding main body 10 is small. Further, the shear stress at the end of the decorative molding main body 10 is reduced.

The ultrasonic horn 40 is for outputting ultrasonic waves from an ultrasonic welder.
In this case, the excess portion of the decorative molding main body 10 is removed by removing the excessive portion of the decorative molding main body 10 by using the ultrasonic horn 40.

Although the decorative mall for automobiles of the present embodiment does not have an insert, the present invention can also be applied to a decorative mall having an insert in the main body 10 of the mall.

Then, the design portion 12 of the decoration mall body 10
When it is desired to transfer the texture to the design portion 12 of the decorative molding main body 10, a texture pattern may be applied to the peelable synthetic resin film 30 which is pressed against the design portion 12 for a predetermined time. In this case, the grain can be added without flowing the grain pattern.

In the above embodiment, the case where the synthetic resin film 30 is moved on the upper surface of the both side walls 24 and the material wound around the unused roll 31 is drawn is described. It is also possible to allocate the sheets one by one in accordance with the molding of the end portion, to carry them without peeling even after the molding, and to peel them off when the mounting to the vehicle body is completed. Further, the synthetic resin film 30 described in the above embodiment may be cut at a predetermined interval, conveyed without being peeled even after molding, and peeled off when the attachment to the vehicle body is completed. If the sheet is peeled off when it has been attached to the vehicle body, it can be prevented from being damaged during transportation. That is, the synthetic resin film 30 is
If the synthetic resin film 30 is not peeled off until the car decoration mall is attached to the vehicle body or the car is delivered to the user, the end of the car decoration mall is covered with the synthetic resin film 30. Can be protected, and the appearance of the design part is not deteriorated.

Further, since there is no need to increase the finishing accuracy of the main body end receiving jig 20, the decorative molding main body 10 is brought into contact with the synthetic resin film 30 so as not to move relative to the synthetic resin film 30 for a predetermined time in a plasticized state. Since it is only necessary to press, mass production can be continuously performed, and the decorative mall for automobiles can be inexpensive. Furthermore, since the finishing of the inner surface of the main body end receiving jig 20 may be lower in finishing accuracy than that of a mold for molding a general synthetic resin, the cost of the main body end receiving jig 20 reduces the manufacturing cost. And

In the plasticized state of the decorative molding main body 10, the releasable synthetic resin film 30 is pressed and adhered to the end portion. Therefore, for example, the shape at the time of molding such as extrusion molding can be modified. As a result, vibration wrinkles (chattering vibration) do not occur on the surface of the design portion 12 of the decorative molding main body 10 due to vibration of the machine, the insert, and the like.

Further, since the synthetic resin film 30 is pressed and adhered to the decorative molding main body 10, vibration wrinkles (chatter vibration) on the surface of the design portion 12 of the decorative molding main body 10 do not occur. . Further, the synthetic resin film 30 to be pressed and adhered is hardly restricted by the shape of the design part 12 of the decoration molding main body 10, and the design part 12 of the decoration molding main body 10 is
Has a high degree of freedom in shape selection.

Furthermore, the peelable synthetic resin film 30 in the case of embodying the present invention is determined by the material relation with the decorative molding main body 10, and the material is determined by the relation with the decorative molding main body 10. Set arbitrarily.

[0038]

As described above, the method for manufacturing a decorative mall for an automobile according to the present invention comprises a synthetic resin decorative mall main body end having a mounting portion located on the vehicle body side and a design portion located on the opposite side to the vehicle body. The synthetic resin film is placed on the main body end receiving jig to be molded, and the decorative mall main body end is placed at a predetermined position on the main body end receiving jig and the synthetic resin film, and the decorative mall main body end is heated. Then, in the plasticized state of the end of the decorative molding main body, a part of the design portion is pressed against a peelable synthetic resin film, and the synthetic resin film is bonded to the main body end receiving jig. Since it is formed by molding, it can be melt-pressed onto a peelable synthetic resin film to form the end of the decorative molding main body, and the surface of the synthetic resin film can be transferred to the design part to form a design part with good appearance. be able to.

Therefore, unlike the conventional case, the terminal piece is not joined to the decorative molding main body, so that the end of the decorative molding main body is not peeled off and the gap between the decorative molding main body and the end is not removed. By continuity, a sense of unity is recognized,
The appearance of the design part is improved. Then, the decorative mall main body that has melted and softened is shaped at the same time as the synthetic resin film is formed on the smooth surface of the synthetic resin film in the shape of the main body end receiving jig, so that the end of the decorative mall main body is formed. Thus, the residual distortion of the decorative molding main body is reduced. Furthermore, since the finishing of the inner surface of the body end receiving jig may be lower in the finishing accuracy of the inner surface than a mold for molding a general synthetic resin, the cost of the body end receiving jig lowers the manufacturing cost. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a method of manufacturing a decorative mall for an automobile according to an embodiment of the present invention in a length direction of the decorative mall main body.

FIG. 2 is a cutting line AA along the length direction of FIG.
It is the expanded sectional view cut | disconnected by.

FIG. 3 is a longitudinal sectional view showing a method of manufacturing the decorative mall for an automobile according to the embodiment of the present invention in a length direction of the decorative mall main body.

FIG. 4 is a sectional view taken along the line BB in the longitudinal direction of FIG. 3;
It is the expanded sectional view cut | disconnected by.

FIG. 5 is a sectional view of an end of a conventional automobile molding.

FIG. 6 is a sectional view of an end of a conventional automobile molding.

FIG. 7 is a rear view of the automobile molding shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 10 decorative molding main body, 11 mounting part, 12 design part, 20 body end receiving jig, 30 synthetic resin film, 40 ultrasonic horn,

Claims (1)

[Claims] 1. A synthetic resin film is placed on a main body end receiving jig for molding a synthetic resin decorative molding main body end having a mounting portion located on a vehicle body side and a design portion located on a side opposite to the vehicle body; A positioning step of placing the decorative mall main body end at a predetermined position of the main body end receiving jig and the synthetic resin film; heating the decorative mall main body end, and in a plasticized state of the decorative mall main body end, A film forming step of abutting and pressing a releasable synthetic resin film on a part of the design portion and sticking and forming the synthetic resin film with the body end receiving jig. A method for manufacturing an automobile decorative mall.