JPH05345345A - Manufacture of molding - Google Patents

Abstract

PURPOSE:To enable unnecessary parts to be removed without cutting and facilitate molding of relatively free-cross-sectional configurations by extrusion-molding unnecessary parts to be removed with resin materials being different from the main body part, and then separating the unnecessary parts molded with different materials from the main body. CONSTITUTION:The general part 1A of a molding has a decorative part 11 and attaching parts 12 integrally, and separating parts 1B comprise only the decorative part 11 in which the attaching parts 12 are removed therefrom. The attaching parts 12 are integrally projected from its rear surface side and formed into an arrowhead in its cross-section, and are made up of, e.g. transparent ionomer resin P1. Each attaching part 12 is molded into a predetermined short length in the longitudinal direction and, in the space parts of respective attaching parts 12, unnecessary parts 12a having the same cross-sectional configuration as the attaching parts 12 and consisting of the material different from the attaching parts 12 are once extrusion-molded, and then it is separated and removed as unnecessary parts from the decorative part 11.

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 Long wall moldings for decoration are often mounted on outer wall plates of ships, vehicles, building materials, and other general equipment. For example, in the window frame opening part, side part, bumper part, etc. provided on the body panel of the automobile,
Wind moldings, side moldings, bumper moldings, etc. are installed. Each of these moldings is usually provided with a molding body made of a long resin material extruded through a die of an extrusion molding device,
A molding body is extruded to a predetermined length in a predetermined cross-sectional shape from an extrusion port provided in the die, and then cut into a predetermined length.

In such various moldings,
After extruding the molding material with a constant cross-sectional shape, a part of this molding material is removed by a predetermined cutting process, so that the cross-sectional shape of the molding body is made different along the longitudinal direction. Various manufacturing methods have been conventionally proposed. For example, in those disclosed in JP-A-63-32915, JP-A-1-128412, or JP-A-1-130816, the inner peripheral side edge portion of the decorative portion covering the edge portion of the window glass is Part of the corresponding part is removed by cutting,
A weir is formed in the cut portion.

Further, in the bumper molding, a molding body arranged so as to be exposed to the outside of the vehicle and a mounting portion for supporting the molding body from the back side are first integrally extrusion-molded, and the mounting portion is mounted. There is a method in which an unnecessary portion of the above is removed by cutting, and the remaining mounting portion is inserted into the bumper side for fixing.

[0005]

However, in the conventional molding manufacturing method involving a cutting step, the formability of the cutting step itself is limited, and for example, cutting such as "cutting" the cross-sectional shape into an undercut shape is almost impossible. It is impossible. Further, if the range to be cut is long, there is a problem that the mold becomes large.

[0006] Therefore, an object of the present invention is to provide a method of manufacturing a molding in which an unnecessary portion can be removed without cutting and a relatively free cross-sectional shape can be easily formed. To do.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a method for manufacturing a molding according to the present invention comprises: extruding a molding material with a constant cross-sectional shape through an extrusion port provided in a die; In the method of manufacturing a molding in which an unnecessary portion is removed from the molding material and a molding body having different cross-sectional shapes along the longitudinal direction is formed, the unnecessary portion to be removed is referred to as a molding body constituent portion. It has a configuration in which resin materials of different materials are extrusion-molded in advance, and unnecessary portions molded of the resin materials of different materials are separated from the molding body constituent parts.

[0008]

According to the means having such a structure, since the unnecessary portion is removed by the separation process which does not involve cutting, the molding is easier to form and easier than the conventional cutting process. Molding flexibility is improved.

[0009]

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. A molding 1 shown in FIG. 1 is mounted on a bumper portion of an automobile, and is a decorative portion 1 arranged so as to be exposed to the outside of the vehicle.
1 and a mounting portion 12 for supporting the decorative portion 11 from the back side
It has a body part consisting of
However, it is designed to be inserted and fixed in the bumper part of a car. This molding 1 is provided with a general portion 1A and a separating portion 1B in series in the longitudinal direction. While the general portion 1A integrally includes a decorative portion 11 and a mounting portion 12, a separating portion is provided. 1B is composed only of the decorative portion 11 from which the mounting portion 12 is removed.

The decorative portion 11 is molded from a transparent ionomer resin P1 and is extruded in a constant C-shaped cross section over the entire length of the general portion 1A and the separating portion 1B. In the vicinity of the outer surface of the decorative portion 11, a metal-like laminated film 11a, which is also formed in a C-shaped cross section, is embedded. On the other hand, the mounting portion 12 is formed in a substantially arrow-shaped cross section integrally projecting from the rear surface side of the decorative portion 11, and is made of the same transparent ionomer resin P1 as the decorative portion 11. The mounting portion 12 is composed of a plurality of members arranged in parallel along the longitudinal direction at regular intervals, and each mounting portion 12 is formed in a predetermined short length in the longitudinal direction. That is, a portion between these mounting portions 12 is formed in a space portion that does not include the mounting portion 12. In this space portion, as will be described later, an unnecessary portion 12 having the same cross-sectional shape as the mounting portion 12 is formed.
The a is once extruded and then separated and removed from the decorative portion 11 as an unnecessary portion.

The mounting portion 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 forming 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 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 toward the front end face side, and one attachment portion extrusion flow passage 212 and two decoration portion extrusion flow passages 213 are continuously provided on the back side of the extrusion molding port 211.
213 is extended. The attachment section extrusion flow path 212
Is opened in the central portion of the extrusion molding port 211, and the two decorative portion extrusion flow channels 213 and 213 are arranged on both sides of the attachment portion extrusion flow channel 212, respectively. It has an opening on the outer periphery. One of the two decorative portion extrusion flow paths 213 and 213 is the first
The die 21 extends so as to bend toward the side surface of the die 21, and a supply source of a resin material P1 (transparent ionomer resin) (not shown) is connected to the external opening thereof. The decorative portion extruding flow path 213 on the other side is branched from the middle portion of the decorative portion extruding flow path 213 connected to the supply source, and extends after straddling the attachment portion extruding flow path 212. It extends to the extrusion molding port 211.

On the other hand, on the base side of the attachment section extruding flow path 212, a reservoir section 21 having 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 portion 214 of 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 flow channels 221 and 2 of the second die 22.
It is arranged so as to face up and down across 21. The material supply flow paths 215 and 215 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 of the pair of material supply channels 215 and 215, and the resin material P2 different from the resin material P1 is supplied from the other side material supply channel 215. Has been sent. As the resin material P2, one that is incompatible with the resin material P1 is used. On the other hand, the material discharge flow paths 216 and 216 are arranged so as to selectively open to the switching flow paths 221 and 221 of the second die 22, respectively, and are provided on the bottom surface of the first die 21, respectively. It is open.

An embodiment of the present invention for molding the molding 1 by using such a device will be described below. First, when molding the general portion 1A integrally including the decorative portion 11 and the mounting portion 12 of the molding 1, the first die 21
And the second die 22 are switched and set in the positional relationship shown in FIGS. As a result, the resin material P1 of the switching flow paths 221 and 221 provided in the second die 22 is
The switching flow channel 221 on the side in communication with the material supply flow channel 215 (right side in the drawing) that is feeding the liquid is opened to the reservoir section 214 side of the first die 21. On the other hand, the switching flow channel 221 on the side in communication with the material supply flow channel 215 that is feeding the resin material P2 (left side in the drawing) is disengaged from the reservoir 214 and is in a closed state, and the material discharge flow channel is also provided. 216 is connected to one side.

As a result, as shown 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 fed to the first die 21 is extruded from the central portion of the extrusion molding port 211 through the attachment portion extrusion flow path 212 of the first die 21. As a result, the mounting portion 12 of the molding 1 is molded with the resin material P1. In addition, at this time, the decorative portion extrusion channels 213, 213 of the first die 21
Also, the resin material P1 is constantly fed, and the resin material P1 is extruded from the outer peripheral side of the extrusion molding port 211 through the decorative portion extrusion flow paths 213 and 213. Therefore, as shown in the cross-sectional shape shown in FIG. 11, the decorative portion 11 is extruded from the resin material P1 while being integral with the mounting portion 12, and the general portion 1A of the molding 1 is molded. It

At this time, the resin material P fed from the material supply flow channel 215 on the other side (left side in the drawing) of the first die 21 to the switching flow channel 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, when the separating portion 1B of the molding 1 is extrusion-molded, the first die 21 and the second die 22 are
The positional relationship shown in FIGS. 3 to 6 is switched and set. As a result, the switching channel 22 provided in the second die 22
A switching flow channel 221 of the side (left side in the drawing) that is in communication with the material supply flow channel 215 that supplies the resin material P2 among the reference numerals 1 and 221 is opened to the reservoir section 214 side of the first die 21. .. On the other hand, the material supply flow path 2 for feeding the resin material P1
Switching channel 221 on the side in communication with 15 (right side in the drawing)
Is separated from the reservoir 214 and placed in a closed state, and communicates with the other side of the material discharge flow path 216.

As a result, as shown by the arrow in the figure, the switching flow channel 221 from the material supply flow channel 215 on the other side (left side in the figure) of the first die 21 to the other side (left side in the figure) of the second die 22. The resin material P2 fed to the first die 21 is extruded from the central portion of the extrusion molding port 211 through the attachment portion extrusion flow channel 212 of the first die 21. Then, a portion corresponding to the mounting portion 12 of the molding 1 is molded as the unnecessary portion 12a by the resin material P2. At this time, the first die 2
The resin material P1 is provided in the decorative portion extruding flow paths 213 and 213 of FIG.
Are constantly sent, and the decorative portion extruding flow paths 213, 2 are
The resin material P1 is extruded from the outer peripheral side of the extrusion molding port 211 through 13. Therefore, as shown in FIG. 12, the decorative portion 11 is extruded separately from the different resin material P1 so as to surround the unnecessary portion 12a.

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

When actually molding the molding 1, as shown in FIG. 11, the general portion 1A and the separating portion 1B are alternately extruded, and the general portion 1A is extruded over a predetermined length. After that, the separation portion 1B is extrusion-molded in a short length, and the general portion 1A is again extrusion-molded 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 general portion 1A and the separating portion 1B. On the other hand, the mounting portion 12 is extruded integrally with the decorative portion 11 by the resin material P1 in the general portion 1A, but is switched from the resin material P1 to the resin material P2 at the boundary portion with the separating portion 1B and is separated. Decorative part 1 in part 1B
The unnecessary portion 12a which is separate from 1 is extruded from the resin material P2.

After the molding material is obtained by such extrusion molding, the unnecessary portion 12a is separated / removed in the separating portion 1B as shown in FIG. As a result, the general portion 1A shown in FIG.
The separating portion 1B shown in 1 is molded, and the molding 1 having the final shape is obtained. The unnecessary portion 12a in the present embodiment is removed by force in the undercut state, but this does not cause a problem.
In particular, when the unnecessary portion 12a is separated and removed after the cooling step, the unnecessary portion 12a is separated very smoothly. Further, at this time, if the unnecessary portion 12a is formed of a water-soluble resin material, the unnecessary portion 12a is melted in the cooling process in the water tank, so that the unnecessary portion 12a can be removed and recovered. The above-described step of separating the unnecessary portion 12a can be performed either before or after performing the standard length cutting of the molding material.

In such extrusion molding, since the unnecessary portion is removed by the separation process which does not involve the cutting process, the molding such as "excavation" is easier than the removal by the conventional cutting process. Is performed, and the degree of freedom in molding is improved.

Next, the molding 3 shown in FIG. 16 is a molding body mounted in the window frame opening of the vehicle body panel of an automobile, and is molded by applying the present invention in the same manner. In this molding 3, a decorative portion 31 made of a predetermined resin material P1 such as PVC is supported by a metallic mounting portion 32 to form a main body portion,
The mounting portion 32 is fixed to the window frame opening of the automobile so that the decoration portion 31 can be mounted.

The general portion 3A of the main body portion is extruded in a substantially rectangular cross-section shape over the entire length,
A rainwater receiving groove 33 is provided in the separating portion 3B over a predetermined length. Rainwater receiving groove 3 provided in this separating portion 3B
3 is formed in a substantially wedge-shaped cross section, and an unnecessary portion 31 is formed by using the same die (extrusion molding die) as described above.
It is once extruded as a. This unnecessary portion 31a is
It is formed of another resin material P2 that is incompatible with the resin material P1 that constitutes the decorative portion 31. From the main body portion of the molding material thus obtained, the unnecessary portion 31a formed of the resin material P2 is separated by a predetermined removing step as shown in the figure, and the molding 3 having the final shape is obtained. Also in the extrusion molding method according to the second embodiment, the same action and effect as those of the extrusion molding method according to the first embodiment can be obtained.

[0027]

As described above, according to the present invention, an unnecessary portion is removed from a molding material once extruded with the same cross-sectional shape over the entire length by a separation process that does not involve a cutting process, and the final molding is performed. As compared with the conventional method of removing by a cutting process, it is possible to relatively easily and easily perform the molding such as "excavation" and the ease of molding of the molding. Also, the degree of freedom in molding can be improved.

[Brief description of drawings]

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

2 is an external perspective view showing an example of an extrusion molding apparatus (die) for molding the molding shown in FIG. 1. FIG.

FIG. 3 is a horizontal sectional view taken along the line AA in 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 transverse cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

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

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

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

11 is an external perspective explanatory view showing a state before an isolation step of an unnecessary portion obtained by actually extruding the molding shown in FIG. 1. FIG.

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

FIG. 13 is an external perspective explanatory view showing a state in which an unnecessary portion 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 General part 1B, 3B Separation part 11, 31 Decoration part 12, 32 Mounting part 12a, 31a Unnecessary part 2 Die 21 1st die 22 2nd die 211 Extrusion molding port 212 Mounting part Extrusion channel 213 Decorative part extrusion flow path 215 material supply flow path 216 material discharge flow path 221 switching flow path

Claims (1)

[Claims] 1. An extrusion molding port provided in a die,
After extrusion molding the molding material with a constant cross-sectional shape, removing the unnecessary portion from the main body of the molding material, in the method of manufacturing a molding such that the cross-sectional shape of the molding is different along the longitudinal direction, The unnecessary portion to be removed is extruded by using a resin material made of a material different from that of the main body, and the unnecessary portion formed by the resin material made of a different material is
A method for manufacturing a molding, characterized in that it is separated from the main body.