JPH0623819A - Method for producing article having hollow portion in longitudinal direction - Google Patents

Abstract

(57) [Abstract] [Purpose] A tubular main body having a hollow portion in the longitudinal direction, and a hollow portion provided in the longitudinal direction of the hollow portion of the main body so as to partially close the hollow portion of the main body. It is possible to easily and inexpensively manufacture an article provided with. [Structure] In the extrusion molding die 11, the main molding path 13
To the main molding path 1 at the same time as the first material P1 is fed.
3 to the auxiliary molding path 14 communicating with the upstream side of the first material P
The first material P1 and the second material P2 which are incompatible with 1
By alternately feeding the same material or a third material P3 having compatibility with the main body 2 made of the first material P1 and the second material P3
The removal body 6 made of the material P2 and the hollow portion 4 made of the third material P3 are continuously extruded from the extrusion opening 12 of the die 11 to form a long extrusion-molded product 1 ', and then the extrusion-molded product. 1'is cut at a portion of the removing body 6 to form the main body 2 having a predetermined length dimension, and the removing body 6 is cut from the cut portion.
The hollow part 4 is formed in the longitudinal direction of the main body 2 by removing.

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 an article having a hollow portion in the longitudinal direction.

[0002]

2. Description of the Related Art Some articles, such as moldings and seal packings, which are mounted on a body of a ship, a vehicle or the like and function as decorations and seals, have a hollow portion formed over their entire length. When such a hollow article is assembled to the body in a bent state, the bent portion may be deformed into a flat shape, resulting in a problem that the decorative property and the sealing property are deteriorated. Therefore, conventionally, there is known a technique in which, after an article having a hollow portion over the entire length is formed by extrusion molding, a separate spacer is inserted into a part of the hollow portion of the article in the longitudinal direction to prevent abnormal deformation. Has been.

[0003]

By the way, it is troublesome and costly to insert a spacer in the middle of the hollow portion of an article having a hollow portion formed over the entire length, and at the same time, it is costly to the hollow portion. There is also a problem that the spacer is displaced.

In view of the above-mentioned problems, an object of the present invention is to provide a tubular main body having a hollow portion in the longitudinal direction and a longitudinal direction of the hollow portion of the main body so as to partially close the hollow portion of the main body. An object of the present invention is to provide an article manufacturing method capable of easily and inexpensively manufacturing an article provided with a solid portion provided in the middle of.

[0005]

In order to achieve the above object, the present invention is directed to a cylindrical main body having a hollow portion in the longitudinal direction and a hollow main body of the main body so as to partially close the hollow portion. A method for manufacturing an article having a solid portion provided in the middle of the hollow portion in the longitudinal direction, the method comprising: in an extrusion molding die, a main body leading to an extrusion opening having a cross-sectional shape corresponding to the cross-sectional shape of the main body. At the same time as feeding the first material such as resin or rubber to the molding path, the auxiliary molding path communicating with the upstream of the main molding path and having a cross-sectional shape corresponding to the cross-sectional shape of the hollow portion of the main body, By alternately feeding a second material such as resin or rubber that is incompatible with the first material and a third material such as resin or rubber that is the same as or compatible with the first material. A main body made of the first material, a removing body made of the second material, and a third material And in Li Cheng real part continuously formed extruded article of extruded elongated from the extrusion opening of the die,
Then, the extruded product is cut at a portion of the removed body to form a main body having a predetermined length dimension, and the removed body is removed from the cut portion to form a hollow portion in the longitudinal direction of the main body. To produce an article.

[0006]

In the method of manufacturing an article constructed as described above, since the third material forming the solid portion is compatible with the first material forming the body, the body and the solid portion are integrated. Be combined with. In addition, since the second material for forming the removal body is incompatible with the first material, the removal body can be easily removed from the cut portion of the main body, and the removal body can be removed in the longitudinal direction of the main body. A hollow part is formed well by removing the body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 showing a molding as an article in a perspective view and FIG. 2 showing a cross section, the molding 1 mainly includes a main body 2 and a solid portion 3.

The main body 2 is made of synthetic resin, rubber or the like and is formed into a cylindrical shape having a hollow portion 4 in the longitudinal direction by extrusion molding, and a core metal 5 made of a rigid flat metal plate, It is inserted parallel to the hollow portion 4 and over the entire length of the main body 2. A solid portion 3 having a desired length is formed in the longitudinal direction of the hollow portion 4 of the main body 2 so as to close the hollow portion 4. The solid portion 3 is made of the same material as or compatible with the main body 2 such as synthetic resin or rubber.
It is formed integrally with the inner peripheral wall of the hollow portion 4.

In a die device for extruding the molding 1 shown in section in FIG. 3 and in a perspective view in FIG. 4, the front side of the die 11 corresponds to the sectional shape of the main body 2 of the molding 1. A main molding path 13 having a cross-sectional shape and an extrusion opening 12 opening to the front side surface of the die 11 is formed.

Inside the die 11, a sub-molding path 14 and a core metal feeding path 15, which communicate with the upstream side of the main molding path 13, are formed vertically adjacent to each other.
Is formed in a sectional shape corresponding to the sectional shape of the hollow portion 4. Further, the die 11 is formed with a first material flow path 16 for guiding the first material P1 to the main molding path 13. Further, the die 11 is provided with a second material flow path 17 for guiding the second material P2 to the sub molding path 14 and a third material flow path 18 for guiding the third material P3 to the sub molding path 14. Has been formed. Furthermore, in the die 11, the switching shutter 20 can be switched between the first and second switching positions between the sub-molding path 14 and the second material flow path 17 and the third material flow path 18. Is installed in.

The switching shutter 20 is provided with first and second communication passages 21 and 22, respectively.
Then, as shown in FIG. 5 to FIG.
When the arrangement is switched to the first position, the second material flow path 17
Is communicated with the sub-forming passage 14 by the first communication passage 21, and the third material passage 18 is not communicated with the sub-forming passage 14,
The second communication passage 22 communicates with the second discharge passage 24.
Further, when the switching shutter 20 is switched to the second position as shown in FIGS. 9 to 12, the third material passage 18 is connected to the sub-forming passage 14 by the second communication passage 22, and
The communication passage 22 is connected to the first discharge passage 23 by the first communication passage 21 without being connected to the sub-forming passage 14.

Next, a method of manufacturing the molding 1 will be described together with an explanation of the operation of the die device configured as described above. A first material P1 made of, for example, PVC (vinyl chloride) such as synthetic resin / rubber for forming the main body 2 of the molding 1 is sent to the first material flow path 16 of the die 11. In the second material flow path 17, a removing body 6 is formed so as to form the hollow portion 4 of the main body 2 which is made of resin / rubber or the like which is incompatible with the first material P2, such as PP (polypropylene). The second material P2 for is sent. Further, a third material P3 made of, for example, PVC, such as resin or rubber having the same material or compatibility with the first material P1, is sent to the third material flow path 18.

As shown in FIGS. 5 to 8, the switching shutter 20
Is located at the first position, the second material P2 of the second material flow path 17 is the first material of the switching shutter 20.
It flows through the communication passage 21 to the auxiliary molding passage 14. And the second
The material P2 has a sectional shape corresponding to the space portion 4 of the main body 2 of the molding 1 in the sub-molding path 14 and flows toward the main molding path 13.

On the other hand, the first material P1 in the first material flow path 16 flows into the main forming path 13 and the core metal 5 in the core metal feeding path 15 is formed.
Is also guided to the main forming path 13.

In the main forming path 13, the first material P1
On the other hand, the second material P2 is inserted and merged, and the first material P1 has the cross-sectional shape corresponding to the cross-sectional shape of the main body 2 and is extruded from the extruding opening. Further, the main body 2 into which the core metal 5 is inserted and the removing body 6 made of the second material P2 are gradually formed.

When the switching shutter 20 is in the first position, the third material P3 in the third material flow path 18 is in the second position of the switching shutter 20 as shown in FIG.
It is guided to the second discharge passage 24 through the communication passage 22 and discharged to the outside of the die 11.

After a predetermined time elapses after the switching shutter 20 is arranged at the first position, the switching shutter 20 is arranged at the second position as shown in FIGS. 9 to 12. Then, the third material P3 of the third material flow path 18 flows through the second communication path 22 of the switching shutter 20 into the sub-shape path 14 to form a cross-sectional shape corresponding to the hollow portion 4 of the main body 2, while the second material P3 is formed. The second material P2 in the flow path 17 is guided to the first discharge path 23 through the first communication path 21 of the switching shutter 20 and discharged to the outside of the die 11.

Therefore, when the switching shutter 20 is in the second position, the third material P3 is inserted and merged with the first material P1 in the main molding path 13, so that the first material P1 is joined. The main body 2 made of P1 and the solid portion 3 made of the third material P3 which is made of the same material as the main body 2 and has mutual properties are integrally formed and gradually formed.

In this way, the switching shutter 20 is switched between the first position and the second position in a predetermined synchronization,
The main body 2 made of the first material P1 is continuously formed from the extrusion opening 12 of the die 11, and the remover 6 made of the second material P2 and the third material P are formed in the longitudinal direction inside the main body 3.
The solid parts 3 made of 3 are alternately formed, whereby a long extrusion molded product 1'is formed.

The extruded product 1'is taken by a take-up device (not shown) arranged in front of the die 11,
By cutting the extruded product 1 ′ at the portion of the removing body 6, a main body 2 having a desired length dimension is formed as shown in FIG. 13.

Thereafter, as shown in FIG. 14, the removing body 6 is removed from the main body 2 to form a hollow portion 4 in the longitudinal direction of the main body 2 as shown in FIG. 1, and the molding 1 is obtained with this. . Since the removing body 6 is formed of a material having incompatibility with the main body 2, the removing body 6 is
Can be easily removed.

In the manufacturing method of the above-described embodiment, by appropriately changing the sectional shapes of the main molding path 13, the sub-molded article 14, the core metal feeding path 15, the core metal 5, etc., as shown in FIG. It is also possible to manufacture the belt molding 1 for a vehicle door. However, even in this case, the hollow portion 4 is formed in the longitudinal direction of the main body 2 by the removing body, and the solid portion 3 integrally coupled with the main body 2 is provided on the way of the hollow portion 4 of the main body 3. It is formed.

[0023]

As described above, according to the present invention,
Simultaneously with extrusion of the main body, a solid part can be integrally formed in the middle of the hollow part of the main body in the longitudinal direction, and the removal body can be easily removed from the cut part of the main body to lengthen the main body. The hollow portion can be favorably formed in the direction. Therefore, an article having a solid portion midway in the longitudinal direction of the hollow portion can be easily and inexpensively manufactured.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a die device for extrusion molding of a molding.

FIG. 4 is a perspective view showing the same die device.

5 is a cross-sectional view taken along line VV of FIG. 3 in a state where the switching shutter is arranged at the first position.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

9 is a cross-sectional view taken along the line IX-IX in FIG. 3 with the switching shutter arranged in the second position.

10 is a sectional view taken along line XX of FIG.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIG.

FIG. 13 is a perspective view showing a state in which an extruded product is cut at a portion of a removed body.

FIG. 14 is a perspective view showing a state in which a remover is removed from the main body.

FIG. 15 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding (article) 2 Main body 3 Solid part 4 Hollow part 6 Removal body 11 Die 12 Extrusion opening 13 Main molding path 14 Sub molding path 20 Switching shutter P1 1st material P2 2nd material P3 3rd material

Claims (1)

[Claims] 1. A tubular main body having a hollow portion in the longitudinal direction, and a solid portion provided in the longitudinal direction of the hollow portion of the main body so as to close a part of the hollow portion of the main body. A method of manufacturing an article, comprising: a resin / rubber for an extrusion molding die, which has a cross-sectional shape corresponding to the cross-sectional shape of the main body and has an extrusion opening opening on the front side surface of the die. At the same time as feeding the first material such as, for example, to the sub-forming path communicating with the upstream side of the main forming path and having a cross-sectional shape corresponding to the cross-sectional shape of the hollow portion of the main body, the first material is not The second material such as a compatible resin / rubber and the same material as the first material or a third material such as a compatible resin / rubber or the like is alternately fed to form the first material. The die includes a main body, a remover made of a second material, and a solid portion made of a third material. Continuously extruding from the extrusion opening to form a long extruded product, and then cutting the extruded product at the portion of the removed body to form a main body of a predetermined length dimension, and from the cutting portion. A method for producing an article having a hollow portion in the longitudinal direction, which comprises forming a hollow portion in the longitudinal direction of the main body by removing the removing body.