JPS6067122A - Manufacture of molding - Google Patents

Abstract

PURPOSE:To obtain the molding without occurrence of flash, even if a long member has dimensional error or fluctuation by achieving injection molding, while providing a cooling device adjacent to the contact part of an injection mold with the long member and cooling said contact part. CONSTITUTION:The long member 6 in which a resin part is formed by extruding, feeding a metal part 2 and decorative films 3, 4 to an extrusion mold, is out into a specified length, and its final end is inserted into the injection mold composed of a cavity mold 8 and a core mold 9 and then, said molds are clamped. Then, the resin is injected into a cavity 12 through a gate 11 from an injection nozzle such that thermal conductive material 16 is caused to be in contact with the adjacent final end of the long member 6. Low temperature cooling fluid is caused to flow into a cooling fluid chamber 17 from a fluid inlet 18, and the contact part 13 of the fluid with the long member 6 is cooled. The resin adjacent to the contact part 13 becomes high viscous by cooling, and the flowing out from the contact part 13 is prevented. Flash 15 never occur at a relief part 14.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a molding manufacturing method in which an end portion of a long material is inserted into an injection mold and a terminal resin portion (end cap) is formed by injection molding, particularly for a vehicle. The present invention relates to a method for manufacturing moldings used for commercial purposes.

BACKGROUND OF THE INVENTION [Prior Art] Various moldings are attached to the bodies of automobiles for decoration and protection. Figure 1 is a perspective view of the front section of the side molding as an example;
The figure is a cross-sectional view taken along line 8-A, and FIG. 6 is a cross-sectional view of a conventional injection molding die according to your method. The molding 1 is made by cutting a long material 6 having a metal part 2, a decorative film 6.4, and a resin part 5 into a predetermined length, forming a terminal resin part 7 at the cut end, and forming an outer part that becomes a decorative surface. Surface 1a and attachment The conventional molding manufacturing method involves extrusion molding the metal part 2 made of metal foil such as iron, aluminum 711, stainless steel foil, etc., and the decorative film 6.4 made of colored or bright resin filter. The long material 6, which is supplied to a mold and has a resin part 5 formed thereon by extrusion molding, is cut into a predetermined length, and the end portion thereof is molded into an injection mold consisting of a cavity mold 8 and a core mold 9, as shown in FIG. The resin is inserted into the mold and clamped, and resin is injected from the injection nozzle 10 into the cavity 12 through the cage 11 to form the terminal resin part 7 so as to be integrated with the cut end of the elongated material 6.

However, in the conventional molding manufacturing method as described above, it is unavoidable that the thickness of the long recess 6 has an error of ±0.2 degrees or variation. This is not limited to extrusion molded products, but also applies to the case where six long pieces of metal are used, such as I-knot molded products or press-molded products. For this reason, when the thickness of the long material 6 is thin, burrs 15 are generated in the relief portion 14 through the abutting portion 16 with the long material 6 of the injection molding mold, and this burr 15 must be removed manually. In addition, there was a problem in that the appearance of the burr 15 was significantly altered by the removal of the burr 15.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problems.A cooling device is provided near the contact part with the elongated material of the injection mold, and injection molding is performed while cooling the contact part.

The purpose of this invention is to provide a molding manufacturing method that does not generate burrs even when there are errors or variations in the long material.

[Structure of the invention]

This invention relates to a method of inserting an end portion of a long material cut into a predetermined length and end shape into an injection mold and forming a terminal resin portion by injection molding. A cooling device is provided near the abutting part (;), and injection molding is performed while cooling the abutting part at a time close to the time when the cavity is filled with the injection resin. This is a method of manufacturing a molding characterized by:

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. FIG. 4 is a sectional view of an injection mold showing a manufacturing method according to an embodiment of the present invention, FIG. 5 is a sectional view taken along line B-B, and FIG. 6 is a graph showing pressure and injection amount during injection molding. , the same reference numerals as in FIGS. 1 to 6 indicate the same or corresponding parts. The injection mold includes a contact portion 1 of the cavity mold 8 with the elongated material 6.
6, a plate-shaped thermally conductive material layer 16 formed to cover the entire widthwise area of the outer surface of the elongated material 6, a cooling fluid chamber 17 provided within this thermally conductive material layer 16, and this cooling fluid chamber. 1
A cooling device consisting of a fluid inlet 18 and a fluid outlet 19 connected to the elongate member 7 is provided at the contact portion 16 with the elongated member 6 .

Good thermal conductive materials include copper, aluminum +') l, 7
There are these alloys.

The manufacturing method for molding 1 is as follows:
The metal part 2 and the decorative film 6.4 are fed into an extrusion mold, and the reciprocal phase 6 forming the resin part 5 is cut into a predetermined length by extrusion molding, and the end part is placed into a cavity mold 8 and a core mold. Insert into an injection mold consisting of 9 and clamp the mold. At this time, ensure good heat conduction. Then, resin is injected from the injection nozzle 10 into the cavity 12 through the gate 11.

The pressure and injection amount of the injected resin during injection molding are set to change stepwise at each point from To to T, as shown in Figure 6, and the pressure holding time during which the cavity 12 is filled with resin is set. (T4~'ri) At or slightly before t, a low-temperature cooling fluid (e.g., water) flows from the fluid inlet 18 into the cooling fluid chamber 17 and is discharged from the fluid outlet 19, passing through the thermally good conductor material layer 16. Contact portion 13 with long material 6
to cool down. Due to cooling, the viscosity of the resin near the abutting part 16 becomes high, and the resin is prevented from flowing out from the abutting part 16, so that the bulge 15 does not occur in the relief part 14.

The thus injected resin is integrally bonded to the end portion of the long It 6 to form the end resin portion 7, and the molded product is taken out as the molding 1 by opening the mold.

In the above embodiment, the elongated material 6 and the cavity 12 have the same cross-sectional shape, and the elongated material 6 and the terminal resin portion 7L/I+1. l! ffi /7'l /4
= I= fr 1. ) +fi /i +7--11
M A: J 1111 1 However, as shown in FIG. 3, the cavity 12 is also formed around the end of the long material 6, and as shown in FIGS. The molding 1 may have a step at the joint between the resin part 6 and the terminal resin part 7.

FIG. 7 is a perspective view of a section 111 of a side molding manufactured according to another embodiment. In the molding manufacturing method of this embodiment, a metal part 2 made of a metal plate such as a stainless steel plate with an irregular cross section by roll forming or press forming is supplied to an extrusion mold, and a resin part 5 (including a bottom mounting resin part 5a) is supplied to an extrusion mold. ) is extruded to form a long material 6,
After cutting this into a predetermined size, the terminal resin portion 7 is formed by injection molding in the same manner as described above. In this case, the thermally conductive material layer 16 is formed so as to come into contact not only with the resin part 5 but also with the outer surface of the metal part 2, thereby preventing the occurrence of flakes over the entire outer surface in the width direction.

FIG. 8 is a perspective view of the front section of a wafer strip molding manufactured according to still another embodiment. In the molding manufacturing method of this embodiment, a metal part 2 made of a metal plate such as stainless steel with an irregular cross section by roll molding or press molding is supplied to an extrusion mold, and a resin part 5 is supplied to the extrusion mold.
A long material 6 (including the lip 5b) formed by extrusion molding is cut into a predetermined size and cut into an end shape having a notch 20.
Similarly to Section 1, the terminal resin portion 7 is formed by injection molding. In this case, the thermally conductive material layer 16 is formed along the cut end forming the terminal resin portion 7 to prevent the occurrence of flakes over its entire length.

In the above description, the shape and structure of the elongated material 6 can be changed depending on the type of intended molding. The fiber may be one that spans the metal part or one that has only five resin parts, but it is generally a combination of both, and it is also possible to have no decorative film 6.4. Metal part 2
Any material such as stainless steel plate or aluminum plate can be used as the material, and it can be roll-formed or press-formed.
Or something that doesn't is used. The resin portion 5 is generally extruded from a synthetic resin with high elasticity, such as a soft vinyl resin. The structure of the injection mold can be changed arbitrarily according to the molding to be manufactured, and the cooling device may also be of other similar structure.Furthermore, the present invention is applicable to side molding, The present invention is not limited to, but can also be applied to the production of other moldings.

〔Effect of the invention〕

According to the present invention, a cooling device is provided near the contact part with the long material of the injection molding mold, and the end fat part is formed by injection molding while cooling the contact part. Even if there are errors or variations in the materials, there is no occurrence of burr, the burr removal work can be omitted, and a molding with an excellent appearance 5 can be manufactured.

[Brief explanation of drawings]

Figure 1 is a perspective view of the 011 section of the side molding, Figure 2 is a cross-sectional view of part 8-A, Figure 6 is a cross-sectional ILi diagram of an injection mold showing the conventional manufacturing method, and Figure 4 is a cross-sectional view of the injection molding die showing the conventional manufacturing method. 5 is a sectional view of an injection molding die showing a manufacturing method according to an embodiment of the invention, FIG. 5 is a BB sectional view thereof, FIG. 6 is a graph showing pressure and injection amount during injection molding, and FIGS. 7 and 8 The figures show Ai1 of moldings manufactured according to other examples.
FIG. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is the molding, 2 is the metal part, 5 is the resin part, 6 is the long material,
7 is a terminal resin part, 8 is a cavity type, 9 is a core type, 12
16 is a cavity, 16 is a contact portion, 15 is a paris, 16 is a layer of thermally conductive material, and 17 is a cooling fluid chamber. Agent Patent Attorney Sei Yanagihara

Claims (3)

[Claims] (1) In the method of forming the final resin part, the end part of the elongated material cut into a predetermined length and end shape is inserted into an injection molding mold, and the end part is formed by injection molding. A method for manufacturing a molding, characterized in that a cooling device is provided near the contact portion with the molding, and injection molding is performed while cooling the contact portion at or near the time when the cavity is filled with the injection resin. (2) The cooling device includes a thermally conductive material layer formed at the contact portion with the elongated material and a cooling fluid path provided in the thermally conductive material layer. method of manufacturing moldings. (3) The method for manufacturing a molding according to claim 1 or 2, wherein the cooling start point 11η is at or near the holding pressure time. -A' The method for manufacturing a molding according to any one of items 1 to 6.