JP3107469B2 - Molding manufacturing method - Google Patents

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 molding for forming a molding into a predetermined bent shape.

[0002]

2. Description of the Related Art Various moldings are mounted on panels provided on ships, vehicles, building materials, general equipment, and the like. For example, a window molding is attached to the periphery of a window glass of an automobile, and a bumper molding is attached from the front to the side of the automobile bumper.
Furthermore, side moldings are mounted on the side surfaces of the vehicle body panel.

[0003] Such various moldings are often bent at corners or the like when mounted. For this reason, for example, in a window molding described in Japanese Utility Model Laid-Open No. 58-73014, a connection is made using a cap separate from the molding at a portion corresponding to the bending. However, in this case, the number of processing steps is increased, and the appearance is not preferable. Therefore, Japanese Patent Laid-Open No. 59-85
In the molding described in Japanese Patent Publication No. 23, after a portion corresponding to the bending of the molding is heated by hot air to be softened, the softened molding is brought into contact with a jig formed in a bent shape to perform cooling and solidification. ing. See also
In Japanese Patent Application Laid-Open No. 0-248426, a plastically deformable rod-shaped member is inserted into a bending-equivalent portion of a molding to maintain a bent state.

[0004]

However, in the former case (JP-A-59-8523), there is a problem that the molding is cooled after the heating of the molding until the jig is mounted. You have to do more than necessary. The latter (Japanese Unexamined Patent Publication No.
In 248426, there is a possibility that the rod-shaped member inserted into the molding may be displaced during transportation, storage, mounting, or the like.

Accordingly, an object of the present invention is to provide a method of manufacturing a molding which can efficiently and satisfactorily mold a portion corresponding to the bending of the molding.

[0006]

According to a first aspect of the present invention, there is provided a molding method for forming a molding to be mounted in a predetermined bent shape, the method comprising the steps of: A jig provided with a molding formed part extending along, the inside of the molded part of the jig,
The bending-equivalent part of the molding is fitted, the molding is heated and softened while the molding is maintained in a bending state by the jig, and then the molding is cooled and solidified while maintaining the bending state of the molding by the jig as it is. It has a configuration to make it.

Further, the second means according to the present invention has a structure in which the jig is heated by the high frequency induction heating means to heat and soften the molding in the first means. I have.

Further, the second means according to the present invention has a structure in which the molding itself is heated and softened by the high-frequency dielectric heating means in the first means.

[0009]

According to each of the means having such a configuration, a bending-equivalent portion of the molding is fitted into the molding formed portion provided on the jig to be bent, and the molding is maintained while the bending state of the molding is maintained as it is. Is heated, softened, cooled and solidified.
Therefore, the heating, softening, cooling and solidifying of the molding can be performed quickly without waste, and the molding can be satisfactorily performed with the minimum required heat.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, an example of a molding formed by the present invention will be described. As shown in FIG.
A window molding 2 made of a long extrusion seal member is mounted on an outer peripheral edge of a window glass 1 on the front side of an automobile. The window molding 2 is provided with an upper molding 2 mounted in a gap between the upper edge of the window glass 1 and the roof panel 3.
U, a side molding 2S attached to a gap between both side edges of the window glass 1 and the pillar panel 4,
Each of the moldings 2U, 2U has a corner molding 2C that connects the upper molding 2U and the side molding 2S in a curved shape.
C and 2S are integrally and continuously extruded.

The wind molding 2 is made of PVC
It is made of a resin material having thermoplasticity such as resin or ionomer resin, and is extruded into a long shape by a predetermined extruder. This wind molding 2
Is the window glass 1 as shown in FIG.
And a leg 21 interposed in a gap between the roof panel 3 and the pillar panel 4, and a windshield 1 is attached to the vehicle exterior (upper side in the drawing) end of the leg 21.
Of the roof panel 3 and the pillar panel 4 from the outside of the vehicle. Further, a glass support piece 23 is provided at the inner end (lower side in the figure) of the leg portion 21 so as to be pressed against the inner edge of the window glass 1.

On the other hand, the decorative portion 22 has an inner peripheral lip 22a and an outer peripheral lip 22b extending from the outer side (upper side in the drawing) of the leg portion 21 toward the inner and outer peripheral sides, respectively. Between the inner peripheral lip 22a and the glass support piece 23, a glass fitting groove 24 having a U-shaped cross section for receiving the outer peripheral edge of the window glass 1 is formed. Each part of such a wind molding 2 has the same cross-sectional shape over the entire length.

After the above-mentioned window molding 2 is extruded linearly by a predetermined extrusion molding device, the corner molding 2C is formed into a curved shape following the bent shape at the time of mounting. A jig 5 as shown in FIGS. 3, 4 and 5 is used for the curved molding of the wind molding 2.

The jig 5 has a curved shape that follows the bent shape of the corner molding 2C when the window molding 2 is finally mounted, and the jig 5 receives the leg portion 21 and the glass support piece 23 of the window molding 2 described above. The forming part 51 is provided so as to extend in a curved shape along the bent shape of the corner molding 2C. This molding part 51
Is an outer mold 5 having a substantially U-shaped cross section that opens upward.
2 and a pair of inner dies 53, 53 having a substantially L-shaped cross section.
The molding part 51 is defined in a substantially L-shaped cross section by the inner walls of these inner dies 53. The inner dies 53 have a split structure that is detachable from the outer die 52.

The jig 5 in this embodiment is made of a conductive metal material, and is configured to be heated by a high-frequency induction heating device (not shown).

An embodiment of the present invention using such a jig 5 will be described below. First, as shown in FIGS. 3, 4 and 5, the corner molding 2 </ b> C of the window molding 2 which is linearly extruded by a predetermined extruder is combined with the molding part 5 of the jig 5 described above.
1 is fitted. In the molding part 51, the leg part 21 and the glass support piece 23 are mounted while being positioned, whereby the corner molding 2C is formed.
It is held in the same bending state as the bending state which is the final mounting state.

Next, the jig 5 is heated by high-frequency induction heating means (not shown) while the bent state of the window molding 2 by the jig 5 is maintained as it is. That is, the jig 5 made of a conductive metal material is heated by the high frequency induction heating means. The heat from the jig 5
The heat is conducted to the side of the window molding 2 to perform heating, whereby the window molding 2 made of a thermoplastic resin material is softened and stress is relaxed.

Further, the window molding 2 is cooled while the bent state of the window molding 2 by the jig 5 is maintained as it is. When the window molding 2 is solidified by cooling, the inner dies 53 of the jig 5 are divided, and the jig 5 is removed from the window molding 2. Thereby, the wind molding 2 is formed three-dimensionally.

As described above, in the present embodiment, the corner molding 2C of the window molding 2 is fitted into the molding forming portion 51 provided on the jig 5 to be bent, and the corner molding 2C is formed.
Heating / softening and cooling / solidification are performed while maintaining the bent state of the as-is. Therefore, the heating, softening, cooling and solidifying of the window molding 2 are quickly performed without waste, and the molding of the molding is preferably performed with a minimum amount of heat.

Next, in the embodiment shown in FIGS. 6, 7 and 8, the molding itself is heated and softened by the high-frequency dielectric heating means. That is, the jig 6 used in this embodiment includes an upper die 61 configured to sandwich the wind molding 2 from above and below,
The upper and lower dies 61, 62 are composed of a lower die 62 and a middle die 63.
By sandwiching the middle die 63 therebetween, a molding forming part 64 corresponding to the cross-sectional shape of the corner molding 2C is defined inside in a curved state.

Each of the molds 61, 62, 63 is formed of a silicon-based material, and is set between both electrodes 71, 72 of the high-frequency dielectric heating device 7, as shown in FIG. The wind molding 2 itself is configured to generate heat when a high frequency voltage is applied from the power supply 73 to the electrodes 71 and 72. In this case, both electrodes 71 and 72 of the high-frequency induction heating device 7 are used.
Is formed of an aluminum material or the like which also serves as a press plate.

First, as shown in FIG. 7, the window molding 2 is fitted into the jig 6 so that the corner molding is held in the same bent state as the final mounting state. . Next, the jig 6 is set between the electrodes 71 and 72 of the high-frequency dielectric heating device 7 while maintaining the bent state of the window molding 2 by the jig 6 as shown in FIG. You. The high frequency voltage from the power supply 73 causes the wind molding 2 made of a thermoplastic resin material.
Is softened and stress is relaxed.

Thereafter, the window molding 2 is cooled while the bent state of the window molding 2 by the jig 6 is maintained as it is in the same manner as in the above-described embodiment, and when the window molding 2 is solidified by cooling, the jig 6 The upper mold 61, the lower mold 62, and the middle mold 63 are divided, and the jig 6 is removed from the wind molding 2. Thereby, the wind molding 2 is formed three-dimensionally.

In this embodiment as well, the heating, softening, cooling and solidification of the window molding 2 are quickly performed without waste, and the molding of the molding can be favorably performed with a minimum amount of heat.

The molding according to the present invention is not limited to the front-side window molding of the vehicle as in the above-described embodiment. In addition to the rear window molding for automobiles, all the moldings for ships, building materials, general equipment, etc. However, the present invention can be applied.

[0026]

As described above, according to the present invention, a bent portion of a molding is fitted into a molding formed portion provided on a jig to form a bent state, and the molding is maintained while maintaining the bent state of the molding as it is. To heat, soften, cool and solidify
Heating, softening, cooling, and solidification of the molding can be quickly performed without waste, and a portion corresponding to the bending of the molding can be efficiently and satisfactorily heat-molded with a necessary minimum amount of heat.

[Brief description of the drawings]

FIG. 1 is an external perspective explanatory view showing a front side of an automobile equipped with a window molding formed according to the present invention.

FIG. 2 is an external perspective view showing a corner portion of the wind molding in FIG.

FIG. 3 is an external perspective view showing a procedure for mounting a jig for wind molding.

FIG. 4 is an external perspective view illustrating a state after a jig is attached to the window molding.

FIG. 5 is a transverse sectional view taken along line VV in FIG. 4;

FIG. 6 is an external perspective view showing another jig used in the present invention.

FIG. 7 is an external perspective view showing a state where a molding is set on the jig shown in FIG. 6;

FIG. 8 is an explanatory side view showing a state where high frequency is applied to a jig on which a molding is set.

[Explanation of symbols]

 2 Wind molding 2C Corner molding 5,6 Jig 51,64 Molding part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 53/00-53/84 B60J 1/00-1/02

Claims (3)

(57) [Claims] 1. A method for manufacturing a molding for forming a molding to be mounted in a predetermined bent shape, wherein a jig having a molding formed portion extending along the bent shape at the time of mounting the molding is used. A part corresponding to the bending of the molding is fitted into the molding forming part of the jig, and the molding is heated and softened while the molding is maintained in the bent state by the jig. Then, the bending state of the molding by the jig is left as it is. A molding method for cooling and solidifying the molding while maintaining the molding temperature. 2. The method of manufacturing a molding according to claim 1, wherein the jig is heated by a high frequency induction heating means to heat and soften the molding. . 3. The method of manufacturing a molding according to claim 1, wherein the molding itself is heated and softened by high-frequency dielectric heating means.