JPH10309752A - Manufacture of weather strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable disposition of a holding member in a die molding part without splitting a hollow seal part after die molding, thereby to ensure quality and to attain improvement in the number of manufacturing processes, by extracting a core from the hollow seal part after the die molding part is formed in a state wherein the holding member is fitted to the core. SOLUTION: A holding member 24 is fitted to a core 32 and disposed in a molding die 30 in this fitted state, and after a die molding part is formed thereby, the core 32 is extracted. In more detail, the core 32 is fitted in the holding member 24 shaped like a slender tube, and in this fitted state, the opposite end parts of the core are inserted into hollow seat parts 14a in the end parts of extruded parts 20 and disposed in the molding die 30. In a state wherein the opposite end parts of the extruded parts 20, the core 32 and the holding member 24 are set in the molding die 30, rubber for forming a die molding part is injected and vulcanized. After the vulcanization is finished, a weather strip is taken out of the molding die 30, while only the core 32 is extracted from a core extraction hole 15 by using an operating arm 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a weather strip which is attached to an opening edge of a vehicle body or a door edge of a vehicle body such as a trunk portion of a motor vehicle or a door for getting on / off and seals the opening. About the method.

[0002]

2. Description of the Related Art Some automotive weather strips include a mounting base attached to an opening edge of a vehicle body or an edge of a door, and a hollow seal bulging from the mounting base. Conventionally, in such a weather strip, the ends of the extruded portions formed by extrusion are connected to each other by a molded portion formed by molding, and at this time, the hollow seal portion in the molded portion is formed by molding during molding. It is formed by placing a core in a mold.

In such a weather strip,
In order to maintain the shape of the hollow seal portion in the molded portion, that is, to maintain the shape having the effect of preventing interference between the door and the body due to overstroke when the door is strongly closed, holding the hollow seal portion made of sponge rubber or the like. A member may be provided.

Conventionally, when such a holding member is disposed, as shown in FIG. 8, after vulcanization molding of a molding portion 103 connecting the extrusion portions 101, 101, a hollow seal portion is formed at an end of the extrusion portion 101. 102, and the holding member 106 is inserted through the slit 105 to form the molded part 1
03 is provided in the hollow seal portion 104, and thereafter, the above-mentioned cutout 105 is bonded.

[0005]

However, in the above-mentioned conventional method, the hollow seal portion 102 is cut off to insert the holding member 106, or the hollow seal portion 1 is inserted after the insertion.
There is a problem in that it takes a lot of man-hours to bond 02. In addition, since the hollow seal portion 102 is bonded in this manner, there is a problem that a step is generated on the bonding surface or a hardness change is caused by the adhesive, thereby deteriorating the quality of the weather strip.

Accordingly, the present invention provides a weatherstrip in which a holding member can be provided in a molded portion without tearing the hollow seal portion after the molding, thereby ensuring quality and improving man-hours. It is an object of the present invention to provide a method for producing the same.

[0007]

According to a first aspect of the present invention, there is provided a method for manufacturing a weather strip having a hollow seal portion, wherein ends of the extruded portions formed by extrusion are formed by molding. Connected in a molding part, a hollow seal part in this molding part is formed by a core arranged in a molding die at the time of molding, and a holding member for holding a shape is arranged in the hollow seal part in the molding part. In the method for manufacturing a weather strip, the molding is performed by attaching the holding member to a core, forming a molded part in the attached state, and then removing the core from the hollow seal part.

As described above, the molded portion is formed with the holding member attached to the core, and the ends of the extruded portions are connected to each other.
Thereafter, by extracting the core, the holding member is disposed in a state of being integrally fixed in the hollow seal portion of the molded portion at the time of molding. Therefore, the holding member can be provided in the molded portion without tearing the hollow seal portion after the molding, so that the quality of the weather strip can be secured, and the number of manufacturing steps can be improved. .

According to a second aspect of the present invention, there is provided a weather strip having a hollow seal portion, wherein end portions of the extruded portions formed by extrusion are connected to each other by a molded portion formed by molding. In a method of manufacturing a weather strip, a hollow seal portion in a molding portion is formed by a core arranged in a molding die at the time of molding, and a holding member for holding a shape is disposed in the hollow seal portion in the molding portion. In molding, the holding member is inserted into the hollow seal portion of the extrusion portion, a molded portion is formed in this inserted state, the core is removed from the hollow seal portion, and then inserted into the extrusion portion. The holding member is moved to the molding part.

[0010] As described above, the holding member is inserted in advance into the hollow seal portion of the extruded portion, a molded portion is formed, the ends of the extruded portion are connected to each other, and after the core is removed, the inserted member is inserted. Since the held holding member is moved to the molding section, the holding member can be disposed in the molding section without tearing the hollow seal section after the molding. Therefore, the quality of the weather strip can be ensured, and the number of manufacturing steps can be improved. Further, according to this manufacturing method, by adjusting the position of the core removal hole and the length of the holding member provided in the hollow seal portion for extracting the core, the holding member moved after the die molding is used. Since the hole can be closed, the appearance of the weather strip can be improved.

[0011]

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

FIG. 1 is a perspective view of an essential part of a weather strip at the time of molding in a method of manufacturing a weather strip according to a first embodiment of the present invention.

The weather strip 1 in this embodiment
Numeral 0 seals the vehicle body opening 1 in the trunk portion of the automobile shown in FIG. 5, and as shown in FIG. 4, a mounting base 12 having a substantially inverted U-shaped cross section and mounted to the body flange 2. A hollow seal portion 14 having a substantially circular cross section and bulging from the top of the base portion 12 and in contact with the edge of the door 3 is provided. Here, the mounting base 12 is made of solid rubber, and the insert metal 16 is embedded therein, while the hollow seal part 14 is made of sponge rubber. In addition,
Reference numeral 17 denotes a seal lip formed so as to protrude from the lower end of the mounting base 12, and is in contact with the body surface. Also,
Reference numeral 18 denotes a holding lip formed on the inner surface of the mounting base 12 to hold the body flange 2.

The weather strip 10 is formed by connecting both end portions of a single extruded portion 20 formed by extrusion molding with a molding portion 22 formed by molding and forming a ring shape. Are formed integrally over the entire circumference. Then, as shown in FIG. 5, the molded portion 22 is disposed at the lower edge of the vehicle body opening 1. The molded part 22 is formed to have substantially the same cross-sectional shape as the extruded part 20. here,
The hollow seal portion of the extruded portion 20 is designated as 14a, and the hollow seal portion of the molded portion is designated as 14b.

As shown in FIG. 4, a holding member 24 for holding the shape of the hollow seal portion 14 is provided in the hollow seal portion 14b of the molded portion 22. This has the effect of preventing interference between the door and the body due to overstroke when the door is strongly closed. The holding member 24 is a tubular member made of sponge rubber and having a circular cross section, and is disposed in the hollow seal portion 14 from the molded portion 22 to the end portions of the extruded portions 20 on both sides thereof.

When manufacturing the weather strip 10, first, in an extrusion molding step, an extruded portion 20 having the above-described cross-sectional shape is formed with a predetermined length. Then, it is put into a molding step, and both ends of the extruded section 20 are connected by a molded section 22. At that time, the molding part 22
The holding member 24 is disposed in the hollow seal portion 14b.

Hereinafter, this molding step will be described in detail.

As shown in FIG. 1, both end portions of the extruded portion 20 are arranged in a molding die 30 with the both end portions facing each other at a predetermined interval. At that time, the core 32 for forming the hollow seal portion 14 b in the molding portion 22 is placed in the molding die 30 with being inserted into both ends of the extrusion portion 20. In the drawings, reference numeral 21 indicates connection surfaces at both ends of the push-out portion 20.

As shown in FIG. 2 (b), the core 32 has an elongated cylindrical shape and has an operation arm 34 at one end. The operating arm 34 is inserted into the hollow seal portion 14a at one end of the push-out portion 20 from a core hole 1 provided therein.
5 to expose the outside.

In the present embodiment, the holding member 24 is attached to the core 32, and the holding member 24 is placed in the molding die 30 in the attached state to form the molded portion 22, and thereafter, the core 32
Of the holding member 24 in the molded part 22.
Is provided.

More specifically, a core 32 is inserted into an elongated tubular holding member 24 shown in FIG. 2A, and both ends of the core 32 are pushed out of the hollow sealing portion 1 at the end of the extruding portion 20 in this inserted state.
4a and 14a, and placed in the mold 30. The relationship between the length and thickness of the holding member 24 and the core 32 can be appropriately set according to the shape of the vehicle type and the required performance.

With the end portions of the extruded portion 20, the core 32, and the holding member 24 set in the molding die 30, rubber for forming the molded portion 22 is injected and vulcanized. . After the vulcanization is completed, the weather strip 10 is taken out of the molding die 30, and only the core 32 is pulled out from the core hole 15 using the operation arm 34.

As a result, as shown in FIG. 3, the holding member 24 is disposed in a state of being integrally fixed in the hollow seal portion 14b by the rubber forming the molded portion 22.

As described above, the holding member 24 can be installed in the hollow seal portion 14 from the molded portion 22 to the end portions of the extruded portions 20 on both sides thereof during the molding.
There is no need to cut the hollow seal portion as in the above-described conventional method, so that the quality of the weather strip can be ensured and the number of manufacturing steps can be improved.

FIG. 6 is a perspective view of a main part of a weather strip manufactured by the method of manufacturing a weather strip according to the second embodiment of the present invention.

In this embodiment, in the molding step, before the extruded portion 20 is set in the molding die 30, the holding member 24 is inserted into the hollow seal portion 14a at one end thereof.
Is inserted, the molded part 22 is formed in this inserted state, and after the core 32 is extracted from the hollow seal part 14b, the holding member 24 inserted into the extruded part 20 is hollowed in the molded part 22. It is characterized in that it is moved to a predetermined position in the seal portion 14b.

More specifically, as shown in FIG. 7A, one end of the extruded portion 20 is located at a position in the hollow seal portion 14a which is shifted from a portion arranged in the molding die 30.
The holding member 24 is inserted in advance. And the extrusion unit 2
The core 32 is set in the molding die 30 with the cores 32 inserted at both ends, and rubber for forming the molded part 22 is injected and vulcanized. After the vulcanization is completed, the weather strip 10 is taken out from the mold 30 and the core 32 is pulled out from the core hole 15 using the operation arm 34. Then, FIG.
As shown in (b), the holding member 24 inserted in advance is used.
Is moved to the molding section 22 by air or the like, and fixed at a predetermined position using an adhesive or the like.

As a result, as shown in FIG. 6, the holding member 24 is installed in the hollow seal portion 14 from the molded portion 22 to the ends of the extruded portions 20 on both sides thereof. As described above, since the holding member 24 can be installed in the hollow seal portion 14 without cutting the hollow seal portion 14,
We can ensure the quality of the weather strip,
The manufacturing man-hour is also improved.

In this case, as shown in FIG. 6, the length of the holding member 24 and the position of the core hole 15 are adjusted so that the core hole 15 is closed by the holding member 24. Is preferred. That is, in this embodiment, the core hole 15 is smaller than that of the first embodiment.
Is set in the vicinity of the connection surface 21 of the pushing section 20. In this way, the appearance of the weather strip 10 can be improved by closing the core hole 15 with the moved holding member 24.

In each of the above embodiments, the case where both ends of one extruded portion 20 are connected has been described. However, the present invention is also applicable to the case where the ends of two extruded portions are connected. It is possible.

Further, the molded portion 22 is not limited to the straight portion at the lower edge of the vehicle body opening 1 and may be set at a corner portion. In the present invention, the molded portion 22 is provided below the vehicle body opening. It is preferable to set at an edge or a corner.

[0032]

According to the method of manufacturing a weather strip of the present invention, the holding member can be disposed in the hollow seal portion of the molded portion without cutting the hollow seal portion. Can be secured, and the number of manufacturing steps can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a weather strip at the time of molding according to a first embodiment of the present invention.

FIG. 2A is a perspective view of a holding member according to the embodiment, and FIG. 2B is a perspective view of a core according to the embodiment.

FIG. 3 is a perspective view of a main part of the weather strip manufactured by the manufacturing method of the embodiment.

FIG. 4 is a cross-sectional view of the weather strip according to the embodiment when the vehicle is mounted on a vehicle body.

FIG. 5 is a perspective view showing a trunk portion of the automobile.

FIG. 6 is a perspective view of a main part of a weather strip manufactured by a manufacturing method according to a second embodiment of the present invention.

FIGS. 7A and 7B are schematic plan views of a weather strip at the time of molding according to a second embodiment, wherein FIG. 7A shows a state where the weather strip is arranged on a molding die, and FIG. 7B shows a state where a holding member is moved after vulcanization. Are respectively shown.

FIG. 8 is a perspective view of a main part showing a conventional method for manufacturing a weather strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Weather strip 14 ... Hollow seal part 14a ... Hollow seal part in an extrusion part 14b ... Hollow seal part in a molding part 20 ... Extrusion part 22 ... Formation part 24 ... Holding member 30 ... Forming die 32 ...

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Claims (2)

[Claims] 1. A weather strip having a hollow seal portion, wherein ends of an extruded portion formed by extrusion molding are connected to each other by a molded portion formed by molding, and the hollow seal portion in the molded portion is formed during molding. In a method of manufacturing a weatherstrip in which a holding member for maintaining a shape is provided in a hollow seal portion of the mold forming portion, the holding member being formed by a core arranged in a mold, A method for manufacturing a weather strip, comprising: mounting, forming a molded part in the mounted state, and then removing a core from the hollow seal part. 2. A weather strip having a hollow seal portion, wherein ends of extruded portions formed by extrusion are connected to each other by a molded portion formed by molding, and the hollow seal portion in the molded portion is formed during molding. In a method of manufacturing a weather strip, which is formed by a core disposed in a mold, and a holding member for maintaining a shape is provided in a hollow seal portion in the molded portion, a mold is formed in a hollow seal portion in an extruded portion. Inserting the holding member, forming a molded portion in this inserted state, removing the core from the hollow seal portion, and then moving the holding member inserted into the extrusion portion to the molded portion. A method for manufacturing a weather strip, comprising: