JPS583841A - Forming of bead for automobile - Google Patents

Abstract

PURPOSE:To make a bottom face of a bead into a shape reproducing exactly a shape of a car body and prevent peeling, etc. of the bead, by high frequency heating, forming the resin made bead body using an upper mold of the silicone molds. CONSTITUTION:A thermoplastic resin material is formed into a bead body 2 by an extruder 1, cooled by a cooling device 3, solidified, drawn by a take-up device 4, cut into a predetermined length by a cutter 5 and made to the bead body 6 of the predetermined length. The bead body 6 is inserted in a cavity of the silicone molds 9 composed of an upper mold 7 and a lower mold 8. A shape of a final outer face is engraved on the lower mold 8 and also a shape of the upper mold 7 is made to coincide with an appearance of a car body to which the bead is attached. The silicone molds 9 in which the bead body 6 is inserted are placed in a high frequency molder and a decorative bead 10 having a final shape is made by heating under pressure and plasticizing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding method for a molding for an automobile, and more specifically, a method for molding a decorative molding made of a synthetic resin having a shape along the body of an automobile and attaching it to the vehicle body using double-sided tape. This article relates to a reliable molding method for automobile moldings.

When attaching an automobile molding to a predetermined position on the car body, both 111m of adhesive are attached to the bottom of the molding! Use a kimono tag. To ensure that the molding is fixed to the vehicle body using this double-sided tape, it is desirable that the bottom surface of the molding correctly match the external shape of the vehicle body. If the shape of the bottom of the molding deviates from the external shape of the vehicle body, uneven adhesion may occur and locally
This will create a sticky bond and cause the molding to peel off.

Conventional molding of the bottom of a synthetic resin molding involves cooling and solidifying a molding body extruded by an extruder, and then cutting the bottom of the molding body using a bottom cutter to follow the shape of the mounting position as closely as possible. After the cutting, the molding body is cut to a predetermined length, and then the ends are processed by an end processing machine. In this conventional method, since the bottom surface of the molding is cut, surface irregularities are unavoidable, and since the bottom surface of the molding cannot be processed in a shape that perfectly follows the external shape of the car body, double-sided tape is attached to the molding. Even if the molding is adhered to the vehicle body and a pressing force is applied through the molding, this pressing force cannot be applied uniformly to the entire surface of the molding, and adhesive dams 2 occur, which may cause the molding to peel or fall off. .

This invention involves cutting an extruded resin molding body that has been cooled and solidified into a predetermined length, and then high-frequency heating molding using a silicon mold upper mold having a cavity that matches the shape of the vehicle body to which the molding is attached. The roughness grade of the bottom surface is increased and the bottom surface of the molding is shaped to fill the shape of the car body, so that the molding and the car body are fixed with almost uniform adhesive force, and the drawbacks of the conventional example mentioned above are solved. The purpose of this invention is to provide a molding method for automotive moldings.

Embodiments of the invention will be described with reference to the accompanying drawings.

A molding body 2 is formed by extruding a thermoplastic resin material using an extruder 1. The molding body 2 is a cooling device 3
It is cooled and solidified, pulled by a pulling machine 4, and cut into a predetermined length by a cutting machine 5 to form a molding body 6 of a predetermined length. Mall body 6
It is not necessary to make the final shape of the decorative molding, but it is sufficient to approximate the final shape, so extrusion molding is easy.

The molding main body 6 cut into a predetermined length is placed in a cavity of a silicon mold 9 consisting of an upper mold 7 and a lower mold 8.

The lower die 8 is carved into the final outer and inner shape of the molding, and
The upper mold 7 is heated to approximately 150 to 200°C to plasticize it in a state that matches the external shape of the car body to which the molding is attached, and the molding body 6 in the silicone mold 9 is made into a decorative molding 10 having a final shape. . During this processing, the end of the molding body is also processed.

As shown in FIG. 3, the bottom surface 11 of the mold body 6 is uneven and not smooth due to deformation during extrusion molding, but as shown in FIG. By high-frequency heating processing, the bottom surface 11 becomes a surface with a high roughness grade and has a shape that follows the external shape of the vehicle body.

Double-sided tape 12 is attached to the bottom of the decorative molding 10. The decorative molding 10 obtained in this manner has a fine bottom surface and is shaped in a shape that follows the external shape of the vehicle body, ensuring uniform adhesive strength when attached to the vehicle body. , There is no localized uneven adhesion, and the molding does not peel or fall off. .

This makes it possible to widen the selection range of the external shape of the vehicle body.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of mold molding according to the present invention, Fig. 2 is a perspective view of a silicon mold, Fig. 3 is a cross-sectional view of the silicon mold and the mold body, and Fig. 4 is a diagram showing an example of mold molding contained in the silicon mold. It is a sectional view showing a processing state of a molding main body. In the diagram: 1... Extruder, 2... Molding body, 3...
・Cooling device, 6... Molding body of predetermined length, 7...
Upper mold, 8... Lower mold, 9... Silicon mold, 10... Decorative mold, 1... Double-sided tape. Agent Patent Attorney Hideaki Kuwahara

Claims (1)

[Claims] After cooling, the resin mold body extruded by an extruder is cut into a predetermined length, and the mold body of the predetermined length is placed in a silicone mold and subjected to high-frequency molding.The bottom surface is shaped into the external shape of an automobile body. A molding method for a molding for an automobile, which is characterized in that the molding is made to conform to the shape of the mold.