JP2000025085A - Method for molding weatherstrip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate occurrence of a step on a connecting surface of an extrusion molding part to a mold molding part. SOLUTION: In the method for molding a weatherstrip molded integrally with a mold molding part having an outer shape continued to a sealing wall 14 at an end of a roof panel side extrusion molding part 6 having a groove 28 formed between a bent edge 26 and a wall face disposed at a vehicle inside to seal a door glass edge by folding the wall 14 for constituting a hollow seal 16 in a substantially S-like sectional shape; a protrusion 38 extended to cross a boundary between the molding part 6 and the mold molding part at a sectional position adjacent to the edge 26 and bulged from a profile line of a free state of the wall 14 to its inside is provided at a wall of a mold 36, and a part adjacent to the edge 26 of the wall 14 is compressed between the protrusion 38 and a core 42 arranged in the seal 16 of the molding part 6, and molding in the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a weatherstrip in which a molded portion is integrally formed by molding a terminal of an extruded portion.

[0002]

2. Description of the Related Art In a corner portion of a weather strip of an automobile, it is known that a molded portion is integrally formed with the extruded portion by die molding at an end of the extruded portion. For example, when a lip-shaped seal portion is provided in the extruded portion, the molded portion is formed so as to have an outer shape continuous with the seal portion.

[0003]

However, the cross-sectional shape of the end of the above-mentioned extruded portion is apt to vary, especially when the extruded portion is provided with a lip-shaped seal portion. When a gap is formed between the wall surface of the mold holding the terminal and the seal portion, a step, a dough flow, or the like occurs at the boundary between the seal portion of the extrusion molding portion and the molding portion continuous to the seal portion. As a result, there is a problem that the sealing performance of the sealing portion is reduced.

[0004]

According to a first aspect of the present invention, an end of an extruded portion extruded into a cross-sectional shape having a projection serving as a seal portion is set in a mold, and the mold is formed. In the method of forming a weatherstrip, wherein a molded portion having an externally shaped protrusion continuous with the protrusion is formed integrally with the extrusion-molded portion, the molding strip is positioned at a cross-sectional position adjacent to the protrusion. A convex portion extending across the boundary between the extruded portion and the molded portion, and bulging inward from the free outline of the extruded portion is provided on the wall surface of the mold, and the convex portion The molding is performed in a state where a portion of the extruded portion adjacent to the protruding portion is compressed. With this, even if the cross-sectional shape of the protruding portion serving as the sealing portion varies, during the molding, the protruding portion of the extruded portion ends with the compression of the portion adjacent to the protruded portion of the extruded portion. It can be pressed against the wall without any gap.

According to a second aspect of the present invention, a seal wall constituting a hollow seal portion is folded back into a substantially S-shaped cross-sectional shape, and a window glass edge is provided between a bent edge on the outside of the vehicle and a wall located on the inside of the vehicle. The end of the extruded portion formed by forming an extruded portion comprising a groove for sealing is set in a mold, and the mold is formed. In the method of forming a weather strip, wherein the molded portion is formed integrally with the extruded portion, the molded portion is located at a cross-sectional position adjacent to a bent edge on the outside of the vehicle, and the extruded portion and the molded portion are A convex portion extending across the boundary and bulging inward from the outer shape line of the seal wall in the free state is provided on the wall surface of the mold, and the convex portion and the hollow seal portion at the end of the extruded portion are provided. Between the core and It is characterized by performing molding in a compressed state portion adjacent to the vehicle exterior side of the bent edge of Le wall. Thereby, even if the cross-sectional shape of the bent edge on the outer side of the vehicle varies, the molding of the seal wall adjacent to the bent edge on the outer side of the seal wall is accompanied by the compression of the portion of the end of the extruded portion at the time of molding. The bent edge can be pressed against the mold wall without any gap.

According to a third aspect of the present invention, in the second aspect of the present invention, a continuous groove is provided in the convex portion so as to cross a boundary between the extruded portion and the molded portion, and a rib connecting the two is formed by the groove. It is characterized by being molded. A concave portion is formed on a wall surface of the molded portion that is continuous with a cross-sectional position adjacent to the bent edge on the outside of the vehicle by a convex portion provided on the mold. Thereby, the rib is formed in the concave portion, and the rigidity of the concave portion can be increased.

According to a fourth aspect of the present invention, an end of an extruded extruded portion having a tongue-shaped seal lip is set in a mold, and the mold is formed to form an outer shape continuous with the seal lip. In the method of forming a weatherstrip, wherein the molded portion is formed integrally with the extruded portion, the molded portion is located at a cross-sectional position adjacent to the tip of the seal lip, and the extruded portion and the molded portion are A convex portion extending across the boundary of the mold and bulging inward from the outline of the seal lip in the free state is provided on the wall surface of the mold, and the convex portion compresses a side surface near the tip of the seal lip. It is characterized in that the molding is performed in the state. Thereby, even if the cross-sectional shape of the seal lip varies, the tip of the seal lip of the end of the extruded portion is clogged with the wall surface of the mold due to the compression of the side surface near the tip of the seal lip during molding. It can be pressed without.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a corner portion 4 of a weatherstrip 2 of a hard-top vehicle according to the present invention.

In the corner portion 2, a rubber roof panel side extruded portion 6 for sealing an upper edge portion of a door glass (not shown) and a rubber center pillar side for sealing a rear edge portion of a door glass (not shown) are provided. The extruded part 8 is connected to a rubber molded part 10 which is substantially L-shaped. In addition, the code | symbol M has shown the joining surface used as the boundary of the roof panel side extrusion molding part 6 and the molding part 10.

The roof panel side extruded part 6 includes a base 12
And a hollow seal portion 16 formed of a seal wall 14 bulging from the base portion 12 to the inner peripheral side of the door opening.

The base 12 is fitted to a retainer 18 having a substantially U-shaped cross section made of a thin metal fixed along the opening of the vehicle body door. In addition, the hollow seal portion 16
The hollow portion is divided into two by an internal wall 20 provided in the hollow seal portion 16.

A tongue-shaped sub-lip 24 that covers the outer surface of the inner side wall 22 of the retainer 18 is integrally provided on the inner side of the hollow seal portion 16.

On the vehicle outside of the hollow seal portion 16, the seal wall 14 is folded back into a substantially S-shaped cross section. A groove 28 formed between the outer bent edge 26 of the seal wall 14 serving as a protruding portion of the seal portion and the seal wall 14 located on the inner side of the outer bent edge 26. The upper edge of the door glass (not shown) is sealed. The outer seal wall 30 that is continuous from the outer bent edge 26 to the base portion 12 is in contact with the inner side wall 32 of the retainer 18.

[0015] The above-mentioned molded portion 10
It is formed so as to be continuous with the outer shape of the roof panel side extruded portion 6. And, the above-mentioned outer seal wall 30
A concave portion 34 having a substantially rectangular cross section is formed on the wall surface of the molded portion 10 which is continuous with the mold. The concave portion 34 is provided with the retainer 1.
8, the cover 8 is covered by the outer side wall 32 of the retainer 18 so as not to be exposed to the outside.

On the other hand, as shown in FIG. 2, a convex portion 38 is formed on a wall surface of a mold 36 used for molding the corner portion 4. The protrusion 38 is located at a cross-sectional position adjacent to the outer bent edge 26, that is, at a wall surface of the mold 36 abutting on the outer seal wall 30, extends across the joint surface M, and The outer sealing wall 30 is formed so as to bulge inward from the outer shape line of the free state.

The core 42 and the protruding portion 38 provided in the hollow seal portion 16 of the roof panel side extruded portion 6 are provided.
The molding is performed in a state where the outer seal wall 30 is compressed. In the mold at the time of molding, FIG.
As shown in FIG. 7, a continuous concave portion 34 is formed in the roof panel side extruded portion 6 and the molded portion 10 across the joint surface M. Since the concave portion 34 is restored in the roof panel side extruded portion 6 after the mold 36 is removed, as shown in FIG.
Only in this case, a concave portion is formed.

When the mold is formed using the mold 36 provided with the convex portion 38 as in the above embodiment, the shape of the end of the roof panel side extruded portion 6 varies from the expected shape. Also in this case, as shown in FIG. 5, as the outer seal wall 30 of the roof panel side extruded portion 6 is compressed, the bent edge 26 on the outer side of the mold has no gap between the wall surfaces of the molds 36 and 40. Pressed.

Therefore, on the joint surface M at the time of molding, the bent edge 2 on the vehicle exterior side of the roof panel side extruded portion 6 is formed.
6 and the outer shape of the molded portion 10 continuing to the outer bent edge 26 can always be made the same shape. There is no step or material flow between the edge 26 and the molded portion 10 continuing to the bent edge 26 on the outside of the vehicle, and the appearance is good and the seal is prevented from being broken. The desired sealing property can be reliably obtained at the joint surface M. In addition, the broken line shown in FIG. 5 is a cross-sectional shape of the seal wall 14 in a natural state.

Next, a second embodiment of the present invention will be described with reference to FIGS.
Shown in The roof panel extruded part 6 and the molded part 10 have substantially the same shape as the first embodiment, but in the second embodiment, a groove is formed in the convex part 38 formed on the mold 36. Is formed. The groove portion is formed so as to cross the connection surface M between the roof panel side extrusion molding portion 6 and the molding portion 10, and the concave portion 34 is formed in the molding portion 10 when the mold 36 is removed. A rib 46 is formed at a position corresponding to the groove in the recess 34.

According to the second embodiment, the rigidity of the concave portion 34 of the molded portion 10 having a reduced thickness can be increased by the rib 46.

Next, a third embodiment of the present invention is shown in FIG.
In the third embodiment, the extruded portion 48 has a substantially U-shaped cross section between the hollow seal portion 50 and the hollow seal portion 50.
And a tongue-shaped seal lip 54 bulging from the hollow seal portion 50 so as to form a U-shaped groove 52 and having a tip as a seal surface. Then, by setting the end of the extruded portion 48 to the mold 56 and performing the molding, the unillustrated molded portion continuous with the hollow seal portion 50 and the seal lip 54 is formed by the extrusion. It is formed integrally with the forming part 48.

On the other hand, a projection 58 is provided on a wall surface of a mold 56 used for molding.

The convex portion 58 is located on the wall surface of a mold 56 which is in contact with the side surface of the seal lip 54 facing the U-shaped groove 52, and is formed between the extruded portion 48 and a not-shown molded portion. The seal lip 54 is formed so as to extend across the joint surface and to bulge inward from the outline of the seal lip 54 in the free state.

According to the third embodiment, the mold 56
Since the concave portion of the molded portion (not shown) formed by the convex portion 58 provided in the U-shaped groove 52 is located in the U-shaped groove 52, it is possible to prevent the appearance from being impaired without being exposed to the outside.

At the boundary between the extruded portion 48 and a not-shown molded portion, the seal lip 54 of the extruded portion 48 is formed.
There is no step or material flow between the tip and the seal lip tip of the not-shown molded part, and the appearance is good and the seal can be prevented from being broken. It is possible to reliably obtain the initial sealing property.

[0027]

According to the first to fourth aspects of the present invention, by providing a projection on the wall surface of the mold, the sealing portion of the extruded portion and the sealing portion of the molded portion can be formed at the time of molding. The outer shape can always be the same, and at the boundary between the seal part of the extruded part and the seal part of the molded part, there is no step or dough flow, and the appearance is good. In addition to this, the seal can be prevented from being broken, and the desired sealing property can be reliably obtained.

In particular, by providing a groove in the convex portion formed on the wall surface of the mold, a rib is formed in the concave portion of the thin molded portion, and the rigidity of the concave portion is enhanced. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view of a corner portion of a weather strip using a weather strip forming method according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a mold using the method for forming a weather strip according to the present invention.

FIG. 3 is a perspective view showing the outer shape of a weatherstrip in a mold using the weatherstrip molding method according to the present invention.

FIG. 4 is a perspective view of a weather strip using the weather strip forming method according to the present invention.

FIG. 5 is a sectional view showing a deformed state of a seal wall in a mold.

FIG. 6 is a perspective view of a weather strip in a mold according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a weather strip according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a main part of a mold according to a third embodiment of the present invention.

[Explanation of symbols]

 14 ... seal wall 26 ... bent edge 28 ... groove 36 ... mold 38 ... convex

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D024 AA02 AB04 AB17 AB21 AB25 AB41 AB57 3D127 AA11 CB05 DE07 DE20 DE22 EE15 GG08 GG09 4F207 AG06 AG21 AH23 AJ08 KK04 KL62 KL74 KL83

Claims (4)

[Claims] 1. An end of an extruded portion extruded into a cross-sectional shape having a protruding portion serving as a seal portion is set in a mold, and the die is molded to form an outer shape protruding portion continuous with the protruding portion. In a method of forming a weatherstrip in which a molded portion provided with a portion is molded integrally with the extruded portion, the molded portion is located at a cross-sectional position adjacent to the protruding portion, and the extruded portion and the molded portion are A protrusion is provided on the wall surface of the mold that extends across the boundary of the mold and swells inward from the free-form outline of the extrusion-molded portion, and the protrusion is adjacent to the protrusion of the extrusion-molded portion. A method for forming a weatherstrip, wherein the forming is performed while the part to be compressed is compressed. 2. The seal wall constituting the hollow seal portion is substantially S-shaped.
The end of the extruded portion formed by forming a groove that seals the edge of the window glass between the bent edge on the outside of the vehicle and the wall surface located on the inside of the vehicle is folded back into a V-shaped cross-sectional shape. , And forming a mold, a molding section having an outer-shaped molding sealing section continuous with the sealing wall is molded integrally with the extrusion molding section by a weather strip molding method. At a cross-sectional position adjacent to a bent edge on the outside of the vehicle, extends so as to cross the boundary between the extruded portion and the molded portion, and bulges inward from an outer shape line of the seal wall in a free state. A convex portion is provided on the wall surface of the mold, and between the convex portion and a core disposed in the hollow seal portion of the end of the extrusion molding portion, adjacent to the bent edge on the vehicle exterior side of the seal wall. Molding with the part compressed Molding method of a weather strip according to claim and. 3. The protrusion according to claim 2, wherein a continuous groove is provided so as to cross the boundary between the extruded part and the molded part, and a rib connecting the two is formed by the groove. Method of forming a weatherstrip. 4. An end of an extruded extruded portion having a tongue-shaped seal lip is set in a mold, and the mold is formed to form an externally shaped molded portion continuous with the seal lip. In the method of forming a weatherstrip integrally formed with the extruded portion, the weatherstrip is located at a cross-sectional position adjacent to a tip of the seal lip, and crosses a boundary between the extruded portion and the molded portion. And a convex portion bulging inward from the outer shape line of the seal lip in the free state is provided on the wall surface of the mold, and the convex portion presses the side surface near the tip of the seal lip to form the mold. A method for forming a weatherstrip.