JP3197452B2 - Method of manufacturing weather strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip (including door opening trim, molding, etc.).
And a method for producing the same.

[0002]

2. Description of the Related Art In a weather strip of this type, when a weather strip having a hollow seal portion formed over the entire length of one side surface in a longitudinal direction of a base portion is mounted around an opening of a door, a hollow when the door is closed is formed. The reaction force based on the elastic deformation of the seal portion becomes excessive, and the door closes poorly. Further, when it is necessary to attach another component such as a garnish to the outside of the weather strip, the hollow seal portion of the weather strip may interfere with the attachment of the other component.

For this reason, as shown in FIGS. 9 and 10, conventionally, a hollow seal portion 1 extruded over the entire length of one side of a base portion 102 of a weather strip 101 in a longitudinal direction.
It is known that, among the parts 12, an unnecessary part is flattened by a roller to form a flat part 117. A weather strip (door opening trim) having such a structure and a method for manufacturing the same are disclosed in, for example, Japanese Patent Publication No. 3-71288.

[0004]

By the way, in the conventional case, as shown in FIG. 10, the apparent width W2 of the flat portion 117 formed by flatly crushing the hollow seal portion 112 has the hollow seal portion 112. The width W1 of the flat portion 117 is larger than the visible width W1, so that the appearance is deteriorated. In addition, when the garnish is mounted on the outside of the flat portion 117, a part of the flat portion 117 hits the garnish and hinders the mounting. It may be a thing. Further, as shown in FIG. 11, since the hollow chamber 113 of the hollow seal portion 112 becomes a closed chamber by the flat portions 117 on both sides thereof, when the hollow seal portion 112 is formed of vulcanized rubber mixed with a foaming agent, When the hollow seal portion 112 is vulcanized in the vulcanizing tank, the decomposition gas of the foaming agent is filled in the hollow chamber 113, and the gas pressure of the decomposition gas causes the hollow seal 113 to be hollow as shown by a chain line in FIG. A problem occurs in which the portion 112 is excessively expanded.

An object of the present invention is to provide a weather strip in which the appearance of the hollow seal portion and the flat portion can be made substantially the same in order to prevent the appearance from being deteriorated. An object of the present invention is to provide a manufacturing method that can be easily manufactured. Another object of the present invention is to solve the problem that the hollow seal portion is excessively expanded by the gas pressure in the hollow chamber of the hollow seal portion.

[0006]

According to a first aspect of the present invention, there is provided a method for manufacturing a weather strip, wherein a hollow seal portion and a flat portion are continuously formed in a longitudinal direction of a surface of a base portion. A method for manufacturing a formed weather strip, comprising: a base portion; one end portion integrally joined to one side of a surface of the base portion; and the other end portion being located on the other side of the base portion and being free. By forming a curved lip, which is an end and having a substantially curved cross-section, by extrusion, an extrusion molding step of integrally forming the curved lip, and pressing the free end side of the curved lip to the other side of the base portion to adhere the same. An attaching step of forming a hollow seal portion having a hollow closed cross section by the curved lip, and when attaching the free end side of the curved lip to the other side of the base portion, a portion corresponding to the flat portion in advance is used. Press the curved lip against the surface of the base By crimping while a shaping step of forming a flat portion by the curved lip, said curved Li
Removing the protruding portion on the free end side of the tip . Further, a method of manufacturing a weather strip according to the invention of claim 2 is a method of manufacturing a weather strip according to claim 1.
A manufacturing method, wherein a gas vent hole is formed in a hollow seal portion.
Hole drilling process. Further, according to the invention of claim 3,
The method for manufacturing a weather strip is a method for manufacturing a weather strip in which a hollow seal portion and a flat portion are continuously formed in the longitudinal direction of the surface of the base portion. And a curved lip having one end integrally joined to one side and the other end positioned on the other side of the base portion and serving as a free end and having a substantially curved cross-section. A forming step, and a sticking step of forming a hollow seal portion having a hollow closed cross-section by the curved lip by pressing and adhering the free end side of the curved lip to the other side of the base portion; When attaching the free end side of the lip to the other side of the base portion, the flat portion is pressed by the curved lip by pressing the curved lip against the surface of the base portion at a portion corresponding to the flat portion in advance. Shaping process to form And a, a punching step of forming venting holes in the hollow sealing portion. In addition, claim 4
The method for producing a weather strip according to the invention is described in claims 1 to 1.
The method for producing a weatherstrip according to any one of the above items 3
Pressure while pressing the curved lip against the surface of the base.
When forming the flat portion by attaching, the curved lip is attached to the base
The flattened part is formed by being pressed against the other side of the part.

[0007]

In the method for manufacturing a weather strip according to the present invention configured as described above, in the extrusion molding step,
The base portion and the curved lip with the other end being a free end are integrally formed, and in the attaching step, a hollow seal portion is formed by attaching the free end side of the curved lip to the other side of the base portion. You. In the shaping step, a flat portion is formed by pressing the curved lip while pressing the curved lip against the surface of the base portion. Therefore, unlike the conventional manufacturing method in which the flat portion is formed by flattening and pressing the hollow seal portion flat, the curved lip having the free end at the other end is pressed and pressed against the surface of the base portion to flatten. By forming the portion, the problem that the appearance width of the flat portion in appearance becomes excessively large as compared with the appearance width of the hollow seal portion and the appearance deteriorates does not occur. Also,
A process for removing the protruding portion on the free end side of the curved lip
Step so that the free end side of the curved lip is
The problem of protruding from the part is eliminated. Also, by providing a hole forming step of forming a gas vent hole in the hollow seal portion,
Gas in the hollow chamber of the hollow seal portion is discharged to the outside through the vent hole. Also, bring the curved lip to the other side of the base
Bending by forming a flat part by crimping
The lip 11 is pressed against the surface of the base 2 without wrinkles.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 5 to 8, a weatherstrip 1 used as a door opening trim of a vehicle.
Is mainly composed of a base portion 2 and a hollow seal portion 12 integrally formed by extrusion molding. The base 2 is made of synthetic resin, rubber, or the like in which the metal core 3 is inserted.
For example, it is formed of vulcanized rubber such as EPDM and has a substantially U-shaped cross section which is inserted into the flange 6 of the vehicle body 5 at the door opening. A required number of retaining lips 4 are formed which are pressed into engagement with one another.

In the longitudinal direction of the surface of the base portion 2, a hollow seal portion 12 made of foamed vulcanized rubber and rich in elasticity is provided.
And the flat portion 21 of the same material as the hollow seal portion 12 are continuously formed. In this embodiment, FIGS.
As shown in FIG. 2, flat portions 21 are formed at both ends in the longitudinal direction where the garnish 7 is assembled, and the hollow seal portion 12 is formed between the flat portions 21. The hollow seal portion 12 is provided with a gas vent hole 14 for opening the hollow chamber 13 of the hollow seal portion 12 to the outside. The hollow chamber 14 is vulcanized when the hollow seal portion 12 is vulcanized in the vulcanizing tank 30. Decomposed gas generated in 13 is discharged outside through the gas vent hole 14.

Next, a method of manufacturing the weather strip of the above embodiment will be described with reference to FIGS. 1 to 4. In this embodiment, the weather strip is formed by an extrusion step, a sticking step, a shaping step, and a punching step. A strip 1 is formed. That is, as shown in FIG. 1, the base 2 and the curved lip 11 are integrally extruded from an extrusion port 25 formed in the extrusion die 24. The curved lip 11 is for forming the hollow seal portion 12 and the flat portion 21 continuously in the longitudinal direction, and one end of the curved lip 11 is on one side of the surface of the base portion. The other end of the curved lip 11 is opposed to the other side of the base portion 2 with a slight gap and is a free end, and has a substantially curved cross section.

In front of the extrusion port 25 of the die 24, above the curved lip 11, a shaping roller 26 which comes into contact with and separates from the curved lip 11 is disposed so as to be able to move up and down, and FIGS. As shown in FIG.
Affixing roller 27, cutting roller 28
And a drilling machine 29 are provided respectively. And
The free end portion of the curved lip 11 extruded from the extrusion port 25 of the die 24 and formed integrally with the base portion 2 is pressed and adhered to the other end surface of the base portion 2 by the attaching roller 27. The curved lip 11 forms a hollow seal portion 12 having a hollow closed cross section.

The free end of the curved lip 11 is
At the time of sticking to the other side end surface, the length portion corresponding to the flat portion 21 in the longitudinal direction of the curved lip 11 is pressed against the surface of the basic portion 2 by the lowering of the shaping roller 26 in advance, and this is pressed. Thereby, a flat portion is formed.

In this embodiment, in order to press the curved lip 11 against the surface of the base portion 2 without wrinkles by the shaping roller 26, the shaping roller 26 is, as shown in FIG. The curved lip 11 is pressed against the surface of the base portion 2 while being moved toward the other side of the base portion 2 based on the lowering of the shaping roller 26 when the shaping roller 26 is lowered. And crimped. In other words, as the shaping roller 26 descends,
And the shaping roller 26 causes the curved lip 11
Of the base part 2 because the root side is faster and the free end side is slower
And pressed. This allows the curved lip
11 is pressed on the surface of the base 2 without wrinkles.

As described above, the curved lip 11 extruded integrally with the base portion 2 from the extrusion port 25 of the die 24 passes through the shaping roller 26 and the sticking roller 27, whereby the surface longitudinal direction of the base portion 2 is Then, the weather strip 1 having the hollow seal portion 12 and the flat portion 21 continuously is formed. FIG.
(B), when the curved lip 11 is pressed against the surface of the base portion 2, a flat portion 21 is formed, and
Since the free end side of the curved lip 11 protrudes from the one side end surface of the base portion 2 by a predetermined length, the protruding portion 11a
Is cut off by the cutting roller 28.

Thereafter, a gas vent hole 14 is formed in the hollow seal portion 12 of the weather strip 1 by the punch 29, and the hollow chamber 13 of the hollow seal portion 12 is filled with the gas vent hole 14
Through to the outside. After that, the weather strip 1 is vulcanized in the vulcanizing tank 30, then is taken by a take-off device 31 and cut by a cutting device (not shown), so that a single weather strip 1 as a product is manufactured.

In the vulcanizing tank, the hollow seal portion 12 of the weather strip 1 is foamed by heating with a foaming agent mixed in the hollow seal portion 12. At this time, the decomposition gas of the foaming agent is also generated inside the hollow chamber 13 of the hollow seal portion 12, but the decomposition gas generated in the hollow chamber 13 is discharged to the outside through the gas vent hole 14, so that the hollow seal Part 1
This eliminates the problem that the fuel cell 2 is excessively expanded by the gas pressure of the decomposition gas. The base 2 is closed from the cross-sectional shape at the time of extrusion shown in FIG. 1 to the product shape shown in FIG. By manufacturing the weather strip 1 as described above, as shown in FIG. 6, the apparent width W1 of the hollow seal portion 12 and the apparent width W2 of the flat portion 21 are made substantially the same. Can be.

In the above-described embodiment, the case where the curved lip 11 is formed of a vulcanized rubber mixed with a foaming agent has been exemplified. However, the present invention is not limited to this, and may be a solid vulcanized rubber. It may be formed of a synthetic resin, an elastomer, or the like. In this case, the gas vent hole 1 is formed in the hollow seal portion 12.
4 need not be formed.

[0018]

As described above, according to the present invention,
It is possible to easily manufacture a weatherstrip in which the appearance width of the hollow seal portion and the flat portion is substantially the same in appearance and the deterioration of appearance can be prevented. In addition, by providing a drilling step, it is possible to prevent a problem that the hollow seal portion is excessively expanded by the gas pressure in the hollow chamber of the hollow seal portion, and a hollow seal portion having a desired size and shape is provided. The provided weather strip can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a front view of a die for extruding a weather strip according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a production line for a weather strip.

FIG. 3 is a plan view showing a main part of a production line for a weather strip.

FIG. 4 is a view similar to IV (A) -IV (A) and IV of FIG.
It is sectional drawing based on each (B) -IV (B) line.

FIG. 5 is a side view showing the weather strip.

FIG. 6 shows IV (A) -IV (A) and IV of FIG.
It is sectional drawing based on each (B) -IV (B) line.

FIG. 7 is an explanatory view showing a state where the weather strip is attached to a door opening of the vehicle.

FIG. 8 is a sectional view based on the line VIII-VIII of FIG. 7;

FIG. 9 is a side view showing a conventional weather strip.

FIG. 10 shows X (A) -X (A) and X of FIG.
It is sectional drawing based on each (B) -X (B) line.

FIG. 11 is a side view showing the weather strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weather strip 2 Base part 12 Hollow seal part 13 Hollow chamber 14 Gas release hole 21 Flat part 24 Extrusion molding die 25 Extrusion port 26 Shaping roller 27 Sticking roller 28 Cutting roller 29 Drilling machine 30 Vulcanizing tank

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29D 31/00 B29C 47/02 B29C 69/00 B60R 13/06

Claims (4)

(57) [Claims] 1. A method for manufacturing a weather strip in which a hollow seal portion and a flat portion are continuously formed in a longitudinal direction of a surface of a base portion, wherein the base portion and one side of the surface of the base portion are closer to one side. An extruding step of integrally forming a curved lip, one end of which is integrally joined and the other end of which is located on the other side of the base portion and has a substantially curved cross section as a free end, An adhering step of forming a hollow seal portion having a hollow closed cross section by the curved lip by pressing and adhering a free end side of the curved lip to the other side of the base portion; and a free end of the curved lip. When the side is adhered to the other side of the base portion, the curved lip is pressed against the surface of the base portion at a portion corresponding to the flat portion in advance, so that the flat portion is formed by the curved lip. Process and the curved lip Work to remove the protruding part on the free end side
And a method for manufacturing a weatherstrip. 2. The production of the weather strip according to claim 1.
Method for forming a gas vent hole in a hollow seal portion.
A method for manufacturing a weather strip. 3. A method of manufacturing a weather strip in which a hollow seal portion and a flat portion are continuously formed in a longitudinal direction of a surface of a base portion, wherein the base portion and one side of the surface of the base portion are closer to one side. An extruding step of integrally forming a curved lip, one end of which is integrally joined and the other end of which is located on the other side of the base portion and has a substantially curved cross section as a free end, An adhering step of forming a hollow seal portion having a hollow closed cross section by the curved lip by pressing and adhering a free end side of the curved lip to the other side of the base portion; and a free end of the curved lip. When the side is adhered to the other side of the base portion, the curved lip is pressed against the surface of the base portion at a portion corresponding to the flat portion in advance, so that the flat portion is formed by the curved lip. Process and the hollow seal Weather strip manufacturing method characterized by comprising a boring step of forming a gas vent hole, to. 4. The method according to claim 1, wherein
A method of manufacturing an estrip, in which a curved lip is pressed and pressed against the surface of the base to flatten it.
When forming the portion, the curved lip is attached to the other side of the base portion
It is characterized by forming a flat part by crimping while bringing it together
Of manufacturing weather strips.