JPH06858A - Production of molding - Google Patents

Abstract

PURPOSE:To continuously and integrally extrude a molding of a full length while forming solid parts in a part of the molding having a hollow cross section. CONSTITUTION:While decorative parts 11 forming hollow parts 1B serve as apparently solid parts by unnecessary bodies 12a, a molding material is once extruded to its full length so as to have the same cross sectional shape. The unnecessary bodies 12a are removed from the obtained molding material in a separation process. In this manner, a continuous and integral molding 1 is provided with the decorative parts 11 forming the hollow parts IB and reinforcing ribs 12 forming solid parts 1A.

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 long molding used for decoration or the like.

[0002]

2. Description of the Related Art A long molding for decoration is often attached to outer wall plates of ships, vehicles, building materials, and other general equipment. For example, in the window frame opening part or side part or bumper part provided on the body panel of the automobile,
Wind moldings, side moldings, bumper moldings, etc. are installed. Each of these moldings is usually made of a long resin material extruded through a die of an extrusion molding device, and the resin material has a predetermined cross-sectional shape with a predetermined length through an extrusion molding port provided in the die. After being extruded, it is cut to a standard size.

In such various moldings,
For the purpose of weight reduction and the like, it is necessary to extrude a molding into a hollow cross-sectional shape and to provide solid portions such as reinforcing ribs at a plurality of longitudinal positions.
No. 2845 or Japanese Utility Model Laid-Open No. 62-76057. The reinforcing ribs and the like forming the solid portion have a function of keeping the outer shape of the molding constant, and are often arranged especially in the portion corresponding to the bending. The hollow molding is formed into, for example, a C-shaped cross-sectional shape, and a solid portion is formed so that the C-shaped hollow cross-section is solid.

[0004]

Conventionally, when molding a solid portion such as such a reinforcing rib into a molding, a manufacturing method such as mounting "stuffing" at a plurality of positions of the molding has been adopted. However, such a conventional manufacturing method requires a step of connecting separately molded separate members. That is, the conventional molding manufacturing method has a problem in that it is not possible to integrally mold a molding having a solid portion such as a reinforcing rib over the entire length, which results in low productivity.

It is therefore an object of the present invention to provide a method of manufacturing a molding that enables a series of moldings including a solid portion such as reinforcing ribs to be easily molded integrally.

[0006]

In order to achieve the above object, a method of manufacturing a molding according to the present invention is to extrude a molding through an extrusion molding port provided in a die, which has a hollow cross section. In a method of manufacturing a molding in which solid portions are arranged at predetermined intervals at a plurality of longitudinal portions of a molding having a shape, a molding material is extruded in a constant cross-sectional shape through an extrusion molding port of the die. After molding, the unnecessary body is removed from the hollow-corresponding part of the molding material, and the portion remaining after removing the unnecessary body is a solid part. Extrusion molding using a material of a material different from the part equivalent part,
The solid body is formed by separating the unnecessary body formed of the different materials from the hollow-corresponding portion.

[0007]

According to the means having such a structure, the molding material is extruded as an apparent solid integral body having an unnecessary body in the hollow-corresponding part, and the entire length of the molding is extruded in series. Has become.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, an example of molding molded by the manufacturing method of the present invention will be described. The main body of the molding 1 for an automobile shown in FIG. 1 is a decorative portion 11 having a substantially C-shaped cross section arranged so as to be exposed to the outside of the vehicle, and both end edges of the C-shaped cross section of the decorative portion 11. The reinforcing ribs 12 have a solid cross-section by connecting them integrally. On the other hand, this molding 1 is provided with a solid portion 1A and a hollow portion 1B in series in the longitudinal direction,
While the solid portion 1A has a solid transverse cross-sectional shape integrally including the decorative portion 11 and the reinforcing rib 12, the hollow portion 1B has the reinforcing rib 12 removed. It is configured to have a hollow cross-sectional shape including only the decorative portion 11.

Here, the decorative portion 11 is molded from a transparent ionomer resin P1 and is extruded with a constant cross-sectional shape (C-shape) over the entire length of the solid portion 1A and the hollow portion 1B. Further, in the vicinity of the outer surface of the decorative portion 11, a metal-like laminated film 11a similarly formed in a C-shaped cross section is embedded. On the other hand, the reinforcing rib 12 is made of a columnar member having a hollow hollow portion having a substantially C-shaped cross section of the decorative portion 11, and is made of the same transparent ionomer resin P1 as that of the decorative portion 11. ing. The reinforcing rib 12 is composed of a plurality of members arranged in parallel at a predetermined interval along the longitudinal direction, and each of the reinforcing ribs 12 is formed to have a predetermined short length in the longitudinal direction. That is, the portion between these reinforcing ribs 12 is formed in a space portion having a substantially C-shaped cross section defined by the inner peripheral wall of the decorative portion 11. In a space portion between the reinforcing ribs 12, an unnecessary body 12a having the same cross-sectional shape as the reinforcing rib 12 is once extruded so as to form an apparent solid body as described later. After being molded, the unnecessary body 12a is formed on the decorative portion 11a.
It is designed to be separated and removed from

The reinforcing rib 12 may be formed of a resin material different from that of the decorative portion 11 as long as it is compatible with the resin material of the decorative portion 11.

An example of an apparatus for molding the molding 1 having such a structure will be described below. The above-described molding 1 is obtained by subjecting a molding material extruded through a die (extrusion molding die) 2 as shown in FIG. 2 to a removing step described later. The die 2
Is a first die 21 held in a fixed state and a second die 22 mounted in parallel with the first die 21.
And the material of the extruded resin material discharged from the extrusion molding port 211 provided in the first die 21 is switched by the parallel movement of the second die 22.

That is, as shown in FIGS. 2 and 3 to 6, the first die 21 has an extrusion molding port 21.
1 is formed so as to open to the front end face side, and one inner side extrusion flow channel 212 and two outer peripheral side extrusion flow channels 213 are continuously provided on the back side of the extrusion molding port 211.
And 213 are extended. The internal extrusion channel 212
Is opened at the central portion of the extrusion molding port 211, and the outer peripheral side extrusion flow channels 213 and 213 of the two bodies are respectively arranged at both side portions of the inner extrusion channel 212, and It has an opening on the outer periphery. One of these two outer peripheral side extrusion flow paths 213, 213 is the first
The die 21 extends so as to bend toward the side surface side, and a supply source of a resin material P1 (transparent ionomer resin) (not shown) is connected to the external opening thereof. The outer peripheral side extruding flow path 213 on the other side is branched from the middle part of the outer peripheral side extruding flow path 213 connected to the supply source, and after extending so as to straddle the inner side extruding flow path 212, It extends to the extrusion molding port 211.

On the other hand, on the base side of the inner extrusion channel 212, a reservoir portion 21 composed of a cavity of a predetermined size is formed.
4 is provided, and the second die 22 is mounted so as to face the storage portion 214 so as to be capable of reciprocating in the horizontal direction orthogonal to the extrusion direction. The second die 22 is provided with a pair of switching channels 221 and 221 extending substantially parallel to each other in the extrusion direction. One of the pair of switching channels 221 and 221 is configured to be selectively opened with respect to the cavity of the reservoir 214 in the first die 21, and the second channel
Switching channels 221 and 22 are formed by reciprocating parallel movement of the die 22.
The switching of 1 is performed.

Further, the first die 21 has a pair of material supply channels 215 and 215 and a pair of material discharge channels 21.
6, 216 are the switching channels 221 and 2 of the second die 22.
It is arranged so as to face up and down with 21 in between. The material supply channels 215 and 215 among them are the second die 2
It has tabs 215a and 215a for always opening to the two switching flow channels 221 and 221. The resin material P1 is fed from one side (the right side in the drawing) of the pair of material supply flow channels 215 and 215, and the resin material P is supplied from the material supply flow channel 215 on the other side (the left side in the drawing).
A resin material P2 of a material different from 1 is fed. A material that is incompatible with the resin material P1 is used as the resin material P2. On the other hand, the material discharge channels 216 and 216
Is arranged so as to open selectively to each of the switching channels 221 and 221 of the second die 22,
The bottom surface of the first die 21 is opened.

An embodiment of the present invention for molding the above-mentioned molding 1 using such an apparatus will be described below.
First, when molding the solid portion 1A integrally including the decorative portion 11 and the reinforcing rib 12 of the molding 1,
The die 21 and the second die 22 are switched and set in the positional relationship shown in FIGS. As a result, of the switching flow channels 221 and 221 provided in the second die 22, the switching flow channel 221 on the side in communication with the material supply flow channel 215 feeding the resin material P1 (on the right side in the drawing), First die 2
1 is opened on the side of the reservoir portion 214. On the other hand, the resin material P2
The switching flow channel 221 on the side (left side in the drawing) that is in communication with the material supply flow channel 215 that supplies the material is removed from the reservoir 214 and is in a closed state, and the material discharge flow channel 216.
Is connected to one side.

As a result, as indicated by the arrow in the figure, the switching flow channel 221 from the material supply flow channel 215 on one side (right side in the figure) of the first die 21 to the one side (right side in the figure) on the second die 22. The resin material P1 that has been sent to the first die 21 is extruded from the central portion of the extrusion molding port 211 through the inner extrusion channel 212 of the first die 21. As a result, the inner side portion corresponding to the reinforcing rib 12 of the molding 1 has a resin material P.
1 is molded. At this time, the resin material P1 is constantly fed also from the outer peripheral side extrusion flow paths 213 and 213 of the first die 21, and the resin material P1 passes through the outer peripheral side extrusion flow paths 213 and 213 to the extrusion molding port 211. It is pushed out from the outer circumference. Therefore, as shown in the cross-sectional shape shown in FIG. 11, the decorative portion 11 is extruded from the resin material P1 in a solid state integral with the reinforcing ribs 12, whereby the inside of the molding 1 is formed. Real part 1A
However, it is molded with a solid cross-sectional shape.

At this time, the resin material P fed from the material supply flow path 215 on the other side (left side in the drawing) of the first die 21 to the switching flow path 221 on the other side (left side in the drawing) of the second die 22.
2 is discharged to the outside through the material discharge flow path 216 without flowing into the reservoir 214.

Next, the hollow portion 1B of the molding 1
In the case of extrusion molding, the first die 21 and the second die 22
And are switched and set to the positional relationship shown in FIGS. As a result, the switching flow path 2 provided in the second die 22
Of the parts 21 and 221, the switching flow path 221 on the side in communication with the material supply flow path 215 for feeding the resin material P2 (left side in the drawing) is opened to the reservoir portion 214 side of the first die 21. . On the other hand, the switching flow path 22 on the side in communication with the material supply flow path 215 that supplies the resin material P1 (right side in the drawing).
1 is separated from the reservoir 214 and placed in a closed state, and communicates with the other side of the material discharge channel 216.

As a result, as shown by the arrow in the drawing, the switching flow passage 221 from the material supply flow passage 215 on the other side (left side in the drawing) of the first die 21 to the other side (left side in the drawing) of the second die 22. The resin material P2 fed to the first die 21 is extruded from the center portion of the extrusion molding port 211 through the inner extrusion channel 212 of the first die 21. The inner side portion corresponding to the reinforcing rib 12 of the molding 1 is made of the resin material P2.
Is molded as an unnecessary body 12a. At this time, the resin material P1 is constantly fed to the outer peripheral extrusion channels 213 and 213 of the first die 21.
The resin material P1 passes through the extrusion molding port 21 through
It is pushed out from the outer peripheral side of 1. Therefore, as shown in FIG. 12, the decorative portion 11 is formed by the unnecessary body 12a.
The resin material P1 different from the resin material P2 is extrusion-molded as a separate body so as to surround the circumference of, and an apparent solid body is formed.

At this time, the resin material P1 fed from the material supply flow channel 215 on the other side (right side in the figure) of the first die 21 to the switching flow channel 221 on the other side (right side in the figure) of the second die 22. The material is discharged to the outside through the material discharge passage 216 without flowing into the reservoir 214.

When actually molding the molding 1, as shown in FIG. 11, the solid portions 1A and the hollow portions 1B are alternately extruded and the hollow portions 1B are apparently solid portions. After being extruded over a predetermined length while configuring the above, the solid portion 1A is extruded with a short length, and the hollow portion 1 is formed again.
B is extruded over a predetermined length. That is, the decorative portion 11 is extrusion-molded with the same resin material P1 in a constant cross-sectional shape over the entire length of the molding 1 including the solid portion 1A and the hollow portion 1B. On the other hand, the reinforcing rib 12 is extruded by the resin material P1 in the solid portion 1A into a solid shape which is integral with the decorative portion 11.
At the boundary with B, the resin material P1 is switched to the resin material P2, and in the hollow portion 1B, the resin material P2 is extruded so as to form an apparent solid portion as an unnecessary body 12a that is separate from the decorative portion 11. Molded.

After the molding material is obtained by such extrusion molding, the unnecessary body 12a is separated and removed in the hollow portion 1B, as shown in FIG. As a result, the solid portion 1A shown in FIG.
The hollow portion 1B shown in 1 is molded to obtain the molding 1 having the final shape. Separation of the unnecessary body 12a described above
When the removing step is performed after the cooling step, the unnecessary body 12a
The separation process of is performed extremely smoothly. The unnecessary body 12a
The separation step can be performed before or after performing the standard length cutting of the molding material.

In such extrusion molding, originally, the decorative portion 11 forming the hollow portion is extruded as an apparent solid integral body having the unnecessary body 12a, so that the entire length of the molding material can be easily integrated. It is supposed to be pushed out.

Next, the automobile molding 3 shown in FIG. 16 is formed by applying the present invention in the same manner, and the decorative portion 31 forming the hollow portion 3B of the molding 3 has a C A pair of flange-shaped portions 31a, 31a for narrowing the opening on the back side of the letter-shaped cross section is provided. On the other hand, the reinforcing ribs 32 forming the solid portion 3A are
The decorative portion 31 is formed of a convex-shaped member having a hollow portion having a substantially C-shaped cross section as a solid portion.

And the solid part 3A of this molding 3
The hollow portion 3B and the hollow portion 3B are extruded using the same die (extrusion molding die) as described above, and the portion between the reinforcing ribs 32 constitutes an apparent solid portion as the unnecessary body 32a. And is once extruded. This unnecessary body 32a
Is a resin material P that constitutes the decorative portion 31 and the reinforcing ribs 32.
It is molded by another resin material P2 which is incompatible with 1. From the hollow portion 3B of the molding material thus obtained, the unnecessary body 32a formed of the resin material P2 is separated as shown in the drawing by a predetermined removing process, and the molding 3 having the final shape is obtained.

Also in the extrusion molding method according to the second embodiment, it is possible to obtain the same actions and effects as those of the extrusion molding method according to the first embodiment. Note that the unnecessary body 32a in this embodiment is removed by force removal in the undercut state, but this does not cause a problem. Particularly, the unnecessary body 32a is separated and removed after the cooling step as described above. In this case, the step of separating the unnecessary body 32a is performed extremely smoothly. At this time, the unnecessary body 32a
If it is formed from a water-soluble resin material, the unnecessary body 32a is melted in the cooling process in the water tank, and thereby removal / recovery can be performed.

[0028]

As described above, according to the present invention, unnecessary parts are removed by a separating step from a molding material once extruded with the same cross-sectional shape over the entire length while forming an apparent solid part in the hollow part. However, since it is designed to obtain the final molding, the entire length of the molding including both the hollow portion and the solid portion can be easily integrally molded, and the productivity of the molding can be improved. it can.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a molding molded according to an embodiment of the present invention.

FIG. 2 is an external perspective view showing an example of an extrusion molding apparatus (die) for molding the molding shown in FIG.

FIG. 3 is a horizontal sectional view taken along the line AA in FIG.

FIG. 4 is a horizontal sectional view taken along the line BB in FIG.

5 is a cross-sectional view taken along the line C-C in FIG.

6 is a cross-sectional view taken along the line DD in FIG.

7 is a cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

8 is a transverse cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

9 is a transverse cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

10 is a transverse cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

FIG. 11 is an external perspective explanatory view showing a state before the separation step of the unnecessary body in which the molding shown in FIG. 1 is actually extrusion-molded.

12 is a cross-sectional view taken along the line EE in FIG.

13 is an external perspective view showing a state in which an unnecessary body is separated from the molding shown in FIG.

FIG. 14 is a cross-sectional view taken along the line FF in FIG.

FIG. 15 is a cross-sectional view taken along the line GG in FIG.

FIG. 16 is an external perspective view showing another example of the molding molded according to the present invention.

[Explanation of symbols]

 1,3 Molding 1A, 3A Solid part 1B, 3B Hollow part 11,31 Decorative part 12,32 Reinforcing rib 12a, 31a Unnecessary body 2 Die 21 1st die 22 2nd die 211 Extrusion molding port 212 Internal side extrusion flow Channel 213 External extrusion channel 215 Material supply channel 216 Material discharge channel 221 Switching channel

Claims (1)

[Claims] 1. A method for extrusion-molding a molding through an extrusion-molding port provided in a die, wherein the molding is extruded so as to have a hollow cross-sectional shape at a plurality of longitudinal positions. A method of manufacturing a molding in which a solid portion is molded, in which a hollow portion and a solid portion are alternately extruded through an extrusion port of the die in series, and the hollow portion is formed by another member. The hollow portion is extruded with a cross-sectional shape that is substantially the same as the solid portion, and then the hollow portion is apparently solid. A method of manufacturing a molding, characterized in that a molding is obtained by separating and removing an unnecessary body having a cross section from the hollow portion.