JP2004314331A - Weather strip manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weather strip manufacturing method capable of drawing out a core mold without bringing about the lowering of the sealability or appearance quality of a weather strip or the like when the weather strip, in which an insert or the like is embedded, is manufactured. <P>SOLUTION: The rear lower corner part of the weather strip of a front door becomes a mold forming part 15. The mold forming part 15 is equipped with a base bottom part 31, the side wall part 32 extending to an outer peripheral side from the base bottom part 31 and the hollow seal part 33 integrally formed to the side wall part 32. The flat sheetlike insert 42 is embedded in the side wall part 32. At the time of molding of the mold forming part 15, the core mold for forming a hollow part 46 is drawn out from a position, which is almost opposed to the seal surface 33a with a partner member of the seal part 33 so as to hold the hollow part 46, being the non-embedded position of the insert 42 in the side wall part 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weather strip having a mold forming portion, and more particularly to a method of manufacturing a weather strip in which an insert or the like is embedded between a base portion and a seal portion.
[0002]
[Prior art]
Conventionally, a weather strip is attached to a peripheral portion of a door provided at an opening of a vehicle such as an automobile. When this type of weather strip is manufactured, the extruded portion is formed in a long shape by a known extrusion method. Then, the mold forming part is continuously connected and molded to the end surface of the extrusion forming part in a state in which the tip part of the extrusion forming part is set in the mold device for the mold forming part.
[0003]
The mold apparatus used for the connection molding of the mold molding part includes a fixed mold, a plurality of movable molds, and a core mold. The core mold includes a core body for forming a hollow portion and an extending plate extending from the core body. When forming the molded part, first, in a state where the molds are opened, the end of the extruded part formed by the extrusion molding method is set so as to fit into the core body, and the extruded part is set as a mold. Attach to the device. Next, each mold is placed at a predetermined position, and mold clamping is performed. At this time, a cavity for molding a molded part is formed by each mold. Then, unvulcanized rubber is injected into the cavity through a gate or the like (not shown) and filled. Thereafter, the unvulcanized rubber is vulcanized, each mold is opened, and the integrated core mold and vulcanized rubber (molded portion precursor) are removed. At this time, a slit is formed in the mold part precursor due to the presence of the extending plate.
[0004]
Then, by removing the core main body from the slit, a molded part precursor having a hollow part is obtained. Then, a die-molding part is obtained by joining the opening surfaces where the slits face each other with an adhesive at a plurality of locations. That is, a weather strip in which the mold forming portion and the extrusion forming portion are integrated is obtained.
[0005]
In conventional weather strip manufacturing methods, the relationship with the seal portion constituting the hollow portion, for example, because it is on the opposite side of the seal surface or is not visible when the weather strip is mounted, is usually A slit is formed in the base portion to be mounted on the door side mounting portion, and the core body is extracted therefrom (see, for example, Patent Document 1).
[0006]
[Patent Document 1]
JP-A-58-205749
[Problems to be solved by the invention]
However, in a weather strip in which an insert or the like is embedded between the base portion and the seal portion, it is difficult to extract the core body from the base portion. On the other hand, it is conceivable to remove the core body from the seal portion. In this case, however, there is a possibility that the sealing performance is deteriorated and the appearance quality is deteriorated.
[0008]
The present invention has been made to solve the above-described problems, and its object is to seal a weather strip when manufacturing a weather strip in which an insert or the like is embedded between a base portion and a seal portion. It is an object of the present invention to provide a weatherstrip manufacturing method capable of extracting a core mold without deteriorating properties and appearance quality.
[0009]
[Means for solving the problems and effects thereof]
In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.
[0010]
Means 1. Extrusion molding has a base portion that is attached to a mounting portion provided on a vehicle door, a side wall portion that is continuously formed on the base portion, and a seal portion that is integrally formed with the side wall portion to form a hollow portion. A molded part continuously connected to the extruded part by molding, and an insert is embedded in a side wall part of the molded part, which is a part different from the base part, A method of manufacturing a weather strip that is configured such that a portion of the seal portion that faces the mating member of the seal portion at the time of closing and a portion that substantially faces each other across the hollow portion is in contact with a part of the door,
The production of a weather strip, wherein a core mold for forming the hollow portion is extracted from a portion substantially opposed to the sealing surface across the hollow portion when forming the mold forming portion. Method.
[0011]
According to the above means 1, the core mold is extracted from a portion that is substantially opposed to the seal surface of the seal portion across the hollow portion, that is, a portion opposite to the seal surface of the counterpart member and different from the base portion. It has become. In the structure of the weather strip, the positional relationship between the base portion and the seal surface is different from the positional relationship in the conventional weather strip. In other words, the base portion is not provided in a portion substantially opposite to the sealing surface with the mating member, and the portion that was one side surface of the sealing portion in the conventional weather strip is the back surface (sealing surface of the mating member) It is equivalent to the part which is substantially opposed to. Therefore, even if the core mold is removed from a portion substantially facing the sealing surface of the weather strip with the mating member across the hollow portion, the weather strip sealing performance and appearance quality are not deteriorated. The core mold can be extracted from the weather strip in which the insert is embedded.
[0012]
Mean 2. Extrusion molding has a base portion that is attached to a mounting portion provided on a vehicle door, a side wall portion that is continuously formed on the base portion, and a seal portion that is integrally formed with the side wall portion to form a hollow portion. A molded part that is continuously connected and molded by molding to the extruded molded part, and an insert is embedded in the side wall part of the molded part, and the side wall part is in contact with a part of the door A weatherstrip manufacturing method, comprising:
A method of manufacturing a weather strip, wherein a core mold for forming the hollow portion is extracted from a non-embedding position of the insert in the side wall portion when the mold forming portion is formed.
[0013]
According to the said means 2, it becomes the structure which extracts the core metal mold | die for forming a hollow part from the non-embedding position of the insert in a side wall part. Therefore, the core mold can be extracted from the weather strip in which the insert is embedded without deteriorating the sealing performance or appearance quality of the weather strip.
[0014]
Means 3. The weather according to claim 2, wherein the extraction position of the core mold is a position substantially opposite to the sealing surface of the seal portion with the mating member when the door is closed with the hollow portion interposed therebetween. Strip manufacturing method.
[0015]
According to the means 3, the same effect as the means 1 can be obtained.
[0016]
Means 4. 4. A weatherstrip manufacturing method according to any one of means 1 to 3, characterized in that the extraction position of the core mold is a position facing a part of the door when the weatherstrip is mounted. .
[0017]
According to the above means 4, since the core mold extraction position is a position facing a part of the door, the portion becomes invisible after the weather strip is mounted. As a result, it is possible to suppress deterioration in the appearance quality of the weather strip.
[0018]
Means 5. The mold forming portion corresponds to a corner portion of the door, and the seal portion is formed along a peripheral portion of the door, and the base portion and the side wall portion are formed on an inner peripheral side thereof. The method for producing a weather strip according to any one of means 1 to means 4, wherein:
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment will be described with reference to the drawings. As shown in FIG. 1, an automobile 1 as a vehicle in the present embodiment has a front door 2 and a rear door 3, and the doors 2 and 3 are so-called “open doors”. That is, the front door 2 is supported so as to be able to be opened and closed at the front part of the opening for getting on and off formed in the automobile body 4, and the rear door 3 is supported so as to be able to be opened and closed at the rear part of the opening. In the present embodiment, the opening of the rear door 3 is allowed only when the front door 2 is in the open state. Further, the closing of the front door 2 is allowed only when the rear door 3 is in the closed state. In this way, for the convenience of opening both doors 2 and 3, the rear lower corner portion of the front door 2 and the front lower corner portion of the rear door 3 are each substantially rectangular in plan view (side view). . For this reason, the rear lower part of the opening defined when the rear door 3 is in the closed state and the front door 2 is in the open state also forms a substantially square shape.
[0020]
Now, in the present embodiment, since the door weather strip mounted on the front door 2 has a feature, the following description will focus on the door weather strip.
[0021]
As shown in FIG. 2, a door weather strip (hereinafter simply referred to as “weather strip”) 11 attached to the front door 2 is mainly made of a rubber material such as EPDM (ethylene-propylene-diene copolymer rubber) or the like. Made of thermoplastic elastomer such as TPO or their foamed material, three extruded parts 12, 13, and 14 and three molded parts (parts with dotted pattern) 15, 16, and 17 I have. That is, the extrusion molding parts 12, 13, and 14 are formed in a long shape by an extrusion molding machine (not shown). Further, the mold forming parts 15, 16, and 17 are formed by a predetermined mold apparatus so as to connect the end parts of the adjacent extrusion molded parts 12, 13, (13, 14), (14, 15). Yes.
[0022]
4 is a cross-sectional view taken along line JJ of FIG. As shown in the figure, the extrusion molded portion 12 (13, 14) is fitted into a retainer as a mounting portion (not shown) of the front door 2, or as a mounting portion corresponding to the substantially outer periphery of the front door 2. A base portion 21 that is attached to the mounting surface 2a with a clip at a predetermined interval, a side wall portion 22 that extends from the base portion 21 to the outer peripheral side, and a hollow seal portion 23 that is integrally formed with the side wall portion 22. I have.
[0023]
In addition, the mold parts 15, 16, and 17 have a base part, a hollow seal part, and the like, as in the case of the extrusion parts 12, 13, and 14, although the shapes are different. In particular, the mold forming portion 15 corresponding to the rear lower corner portion having a specific configuration in the present embodiment will be described. The mold forming portion 15 includes, as shown in FIGS. A side wall part 32 extending from the base part 31 to the outer peripheral side and a hollow seal part 33 formed integrally with the side wall part 32 are provided.
[0024]
The front door 2 corresponding to the mold forming portion 15 has a mounting surface 2a (see FIGS. 5, 6, and 7) substantially parallel to the outer peripheral surface of the front door 2. Corresponding to the mounting surface 2a, as shown in FIG. 3, the base portion 31 of the molded portion 15 is also formed in a curved shape. And the base part 31 of the shaping | molding part 15 is attached by the clip 41 being stopped for every predetermined interval in the state contact | abutted to the attachment surface 2a. On the other hand, the seal portion 33 of the mold forming portion 15 is formed in a substantially rectangular shape so as to correspond to a substantially rectangular sheet metal shape in a plan view (side view) of the rear lower portion of the front door 2. Since the sealing portion 33 is formed in a substantially square shape as described above, the sealing portion 33 is sufficiently spread around the outer periphery of the front door 2, and thus the sealing performance in the closed state of the front door 2 is sufficiently secured. ing.
[0025]
In other words, the weather strip 11 has the longest distance between the base portion 31 and the seal portion 33 at the corner portion of the corner portion (the side wall portion 32 is the longest). Therefore, it can be said that the distance from the clip 41 is longer as the seal portion 33 is closer to the corner portion. In this regard, in the present embodiment, the following configuration is adopted in order to ensure the stability of the mounting state at the corner portion of the seal portion 33 and in the vicinity thereof.
[0026]
That is, an insert 42 having a flat plate shape (substantially triangular plate shape or home base plate shape) is embedded in the side wall portion 32 corresponding to the corner portion. The insert 42 is made of a resin material having relatively high rigidity, for example, polyamide. Clip holes 43 are formed at a plurality of locations corresponding to the inserts 42, and the side wall 32 is inserted into the clip holes 43 by inserting clips 44 (see FIGS. 6 and 7) as attachment means. Is attached to the sheet metal portion of the rear lower corner of the front door 2.
[0027]
In addition, before the molding of the mold molding unit 15 is completed (when it is extracted from the mold apparatus), the side of the side wall 32 facing the sheet metal part (substantially abuts) is slit by extracting a core mold described later. 45 is formed along the seal portion 33 (see FIGS. 5 to 7). However, the slit 45 is closed with an adhesive or the like when the molding of the mold forming portion 15 is completed. The formation position of the slit 45 (the extraction position of the core mold) is the non-embedding position of the insert 42 in the side wall portion 32, and the sealing surface 33a and the hollow portion of the seal portion 33 with the mating member when the front door 2 is closed. The positions are substantially opposed across 46.
[0028]
Next, a mold apparatus 51 for forming the mold forming portion 15 corresponding to the rear lower corner portion of the weather strip 11 will be described. FIG. 8 is a partial cross-sectional view showing a mold apparatus 51 used for forming the mold forming portion 15. The mold apparatus 51 includes, for example, a fixed mold 52 located on the lower side of the figure, and a plurality of movable molds (first movable mold 53, second movable mold 54, third movable mold 55, and fourth movable mold). 56). A core mold 57 is provided between the fixed mold 52 and the fourth movable mold 56. The first to fourth movable molds 53 to 56 and the core mold 57 are provided so as to be movable relative to the fixed mold 52 by a cylinder or the like (not shown). The core mold 57 includes a core body 58 and an extending plate 59 that extends integrally from the core body 58.
[0029]
The fixed mold 52 and the movable molds 53 to 56 are respectively formed with molding surfaces corresponding to the outer shape of the mold molding portion 15. The core body 58 is for forming the hollow portion 46 of the seal portion 33 and is installed in the center of the space surrounded by the fixed die 52 and the movable dies 53 to 56. A cavity 60 for forming the mold forming portion 15 is formed by the molding surface and the outer surface of the core body 58.
[0030]
Next, the manufacturing method of the weather strip 11 having the above-described configuration and the operation and effect in manufacturing will be described. First, the extrusion molding parts 12, 13, and 14 are molded by a known extrusion molding method using an extrusion molding machine (not shown). By this molding, the base part 21, the side wall part 22 and the seal part 23 of the extrusion molding parts 12, 13, and 14 are formed.
[0031]
Next, the mold forming part 15 is formed as follows. First, in a state where the respective molds 52 to 57 are opened from each other, the end portions of the extruded portions 12 and 13 are fitted and set to both longitudinal ends of the core body 58 of the core mold 57, and the insert 42 is set as described above. The movable molds 53 to 56 and the core mold 57 are arranged at predetermined positions with respect to the fixed mold 52 and are clamped. Thereby, the extrusion molding parts 12 and 13 are attached and fixed to the mold apparatus 51.
[0032]
From this state, as shown in FIG. 9, EPDM in a plasticized state is injected into the cavity 60 from a gate (not shown) and filled. Thereafter, the EPDM is vulcanized and solidified, and after the solidification is completed, the movable dies 53 to 56 are sequentially opened to form a molded rubber member (hereinafter referred to as “molded portion precursor”) together with the core mold 57. The mold is released from the fixed mold 52.
[0033]
Next, the extended plate 59 is grasped and pulled out in a state where the mold forming portion precursor is separately supported. At this time, the core main body 58 is extracted from the slit 45 of the molded part precursor. And by this extraction, the hollow part 46 is formed in the inside of the seal part 33. And the shaping | molding part 15 is obtained by joining the opening surfaces which the slit 45 opposes in several places with an adhesive agent. In addition, although description is abbreviate | omitted, the other shaping | molding parts 16 and 17 are also formed by using a predetermined die apparatus. In this way, the weather strip 11 including the extrusion molding parts 12, 13, and 14 and the mold molding parts 15, 16, and 17 continuously connected to the extrusion molding parts 12, 13, and 14 is provided. can get.
[0034]
As described above, the formation position of the slit 45 (the extraction position of the core mold 57) is the non-embedding position of the insert 42 in the side wall portion 32, and the mating member of the seal portion 33 when the front door 2 is closed. The seal surface 33a and the hollow portion 46 are positioned substantially opposite to each other. That is, the core mold 57 is extracted from a portion opposite to the seal surface 33 a and different from the base portion 31. In the configuration of the mold forming portion 15, the positional relationship of the seal surface 33a between the base portion 31 and the mating member is different from the positional relationship in the conventional weather strip. That is, the base portion 31 is not provided at a portion substantially opposite to the seal surface 33a, and the portion that was one side surface of the seal portion 33 in the conventional weather strip is the back surface (the seal surface) of the seal surface 33a with the mating member. 33a). Therefore, even if the core mold 57 is extracted from a portion (side wall portion 32) substantially opposed across the sealing surface 33a and the hollow portion 46, the insert 42 is embedded without causing deterioration in sealing performance or appearance quality. The core mold 57 can be extracted from the weather strip 11 to be removed.
[0035]
In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.
[0036]
(A) In the above embodiment, the door weather strip 11 attached to the outer periphery of the front door 2 is embodied. However, the door weather strip 11 attached to the outer periphery of the rear door 3 may be embodied.
[0037]
(B) In addition to the rear lower corner portion of the front door 2, the rear upper corner portion (molded portion 16) has a structure in which the insert is embedded as described above, and is molded in the same manner as the mold molded portion 15. A method may be adopted.
[0038]
(C) The portion provided at a position substantially opposing the sealing surface 33a with the counterpart member across the hollow portion 46 is not limited to the side wall portion 32, and may be, for example, one side portion of the sealing portion 33. Good. That is, the core mold 57 may be extracted from one side portion of the seal portion 33 that is substantially opposite to the seal surface 33a and the hollow portion 46.
[0039]
(D) In the above embodiment, the insert 42 is made of polyamide. However, the insert 42 is not particularly limited to polyamide as long as it is a material having higher rigidity than the weather strip 11 or a hard material. You may comprise by the die-cast goods, such as these thermoplastic resin materials, sheet metal, and aluminum alloy. However, when the molded part is formed of a rubber material, it is desirable that the material does not melt during rubber vulcanization.
[0040]
(E) In the above embodiment, EPDM is used as the material of the weather strip 11, but in addition to that, styrene butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene propylene copolymer rubber, acrylic The weather strip may be formed of various types of rubber such as rubber, or a synthetic resin material having rubber-like elasticity (in this case, such a synthetic resin material is also included in the category of the rubber material).
[0041]
(F) In the above-described embodiment, the case where the front door 2 and the rear door 3 are “folded apart” is embodied. However, the front door 2 and the rear door 3 are not necessarily “folded apart”.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a schematic configuration of an automobile according to an embodiment.
FIG. 2 is a schematic diagram illustrating a schematic configuration of a door weather strip.
FIG. 3 is a diagram showing a portion of a weather strip that mainly corresponds to a rear lower corner portion.
4 is a cross-sectional view taken along line JJ of FIG.
5 is a cross-sectional view taken along the line KK in FIG. 3;
6 is a cross-sectional view taken along line LL in FIG.
7 is a cross-sectional view taken along line MM in FIG.
FIG. 8 is a partial cross-sectional view showing a mold apparatus for molding a molded part.
FIG. 9 is a partial cross-sectional view of the mold apparatus showing a state in which a cavity is filled with a rubber material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automobile as a vehicle, 2 ... Front door, 2a ... Mounting surface as an attachment part, 3 ... Rear door, 4 ... Automobile body, 11 ... (Door) Weather strip, 12, 13, 14 ... Extrusion molding part, 15 , 16, 17 ... mold forming part, 31 ... base part, 32 ... side wall part, 33 ... seal part, 33a ... sealing surface, 42 ... insert, 45 ... slit, 51 ... mold apparatus, 52 ... fixed mold, 53- 56 ... movable type, 57 ... core mold, 58 ... core body, 59 ... extension plate.

Claims (4)

Extrusion molding has a base portion that is attached to a mounting portion provided on a vehicle door, a side wall portion that is continuously formed on the base portion, and a seal portion that is integrally formed with the side wall portion to form a hollow portion. A molded part continuously connected to the extruded part by molding, and an insert is embedded in a side wall part of the molded part, which is a part different from the base part, A method of manufacturing a weather strip that is configured such that a portion of the seal portion that faces the mating member of the seal portion at the time of closing and a portion that substantially faces each other across the hollow portion is in contact with a part of the door,
The production of a weather strip, wherein a core mold for forming the hollow portion is extracted from a portion substantially opposed to the sealing surface across the hollow portion when forming the mold forming portion. Method. Extrusion molding has a base portion that is attached to a mounting portion provided on a vehicle door, a side wall portion that is continuously formed on the base portion, and a seal portion that is integrally formed with the side wall portion to form a hollow portion. A molded part that is continuously connected and molded by molding to the extruded molded part, and an insert is embedded in the side wall part of the molded part, and the side wall part is in contact with a part of the door A weatherstrip manufacturing method, comprising:
A method of manufacturing a weather strip, wherein a core mold for forming the hollow portion is extracted from a non-embedding position of the insert in the side wall portion when the mold forming portion is formed. 3. The wafer according to claim 2, wherein the extraction position of the core mold is a position substantially opposite to a sealing surface of the seal portion with a mating member when the door is closed with the hollow portion interposed therebetween. The strip manufacturing method. 4. The weather strip according to claim 1, wherein the core mold is extracted at a position facing a part of the door when the weather strip is mounted. 5. Production method.

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