JP2004284234A - Mold for molding corner part, molding method and weather strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold and a molding method which are capable of forming a corner part free from a crease by conducting hot setting of an extruded article, and a weather strip molded thereby. <P>SOLUTION: The whole of the weather strip 1 for an automobile having a hollow seal part 2 fitted to a fitting base part 3 is formed by extrusion. The extruded article E thus formed is set in a state wherein a part thereof is curved, and the corner part C is formed by the hot setting. In this mold, a pressing-in split part 16 to be pressed into the root part 2a of the hollow seal part 2 positioned inside the corner part C is shaped in an almost rectangular section, while the wall thickness T of the split part 16 is set to be large enough to prevent formation of the crease W in the hollow seal part 2, so that a region 2c continuous to the root part 2a of the hollow seal part 2 be raised. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding die and a molding method for molding a corner portion of an automobile weather strip having a hollow seal portion, and a weather strip formed by these.
[0002]
[Prior art]
Conventionally, a weather strip 20 for an automobile having a hollow seal portion 21 is formed by extruding a straight portion and forming a corner portion C by molding (see FIG. 5). In this case, a connection mark (line) S is formed at the boundary between the extruded product E and the molded product M, which is not preferable in appearance. Further, since the hollow seal portion 21 is formed by using the core, it is necessary to form the core hole 22 in the hollow seal portion 21 (see FIG. 6). An operation for closing the hole 22 with an adhesive is required. Further, since it is necessary to form both the extruded product E and the molded product M, the molding operation is troublesome.
[0003]
For this reason, a means has been devised in which the whole is formed by an extruded product E, and the corner portion C is heated in a molding die and is so-called hot-warped.
The molding die 40 used for this means is composed of a first split die 41, a second split die 42, a third split die 43, a fourth split die 44, and a fifth split die 45. A press-fit split mold portion 46 for press-fitting into the base portion 31a of the hollow seal portion 31 is provided at the distal end portion (see FIG. 7). The thickness t of the press-fitting split mold portion 46 is lower than the height of the hollow seal portion 31 (approximately 1/7 in the case of FIG. 7) so as to easily press-fit the base portion 31a. Is set to
[0004]
[Problems to be solved by the invention]
However, when the extruded product E is hot-warmed using the conventional molding die 40, wrinkles are generated in the hollow seal portion 31 when the extruded product E is set in the molding die 40. Then, the product has a wrinkle W (see FIG. 8).
[0005]
Accordingly, it is an object of the present invention to provide a molding die and a molding method capable of forming a corner portion free from wrinkling by subjecting an extruded product to a heat treatment, and a weather strip formed thereby. It is to provide.
[0006]
[Means for Solving the Problems]
To achieve the above object, a corner forming die (10) according to claim 1 of the present invention comprises a weather strip (2) for a vehicle having a hollow seal portion (2) mounted on a mounting base (3). This is a molding die for forming the whole of 1) by extrusion molding, setting a part of the extruded product (E) in a curved state, and applying hot stiffening to form a corner portion (C). Then, the press-fitting splitting portion (16) to be press-fitted into the root portion (2a) of the hollow seal portion (2) located inside the corner portion (C) has a substantially rectangular cross section, and the press-fitting splitting portion (16) is formed. The thickness (T) of (16) is set thick enough to prevent the wrinkles (W) from being generated in the hollow seal portion (2), and the portion (2) connected to the base (2a) of the hollow seal portion (2) ( 2c) is lifted.
[0007]
The size at which the wrinkle (W) does not occur in the hollow seal portion (2) cannot be strictly limited, but at least the thickness (t) of the press-fitting split portion (46) of the conventional molding die shown in FIG. About two to three times larger.
[0008]
The corner part forming die (10) according to the second aspect of the present invention has a thickness (T) at the center of the corner part (C) of the press-fitting die part (16), and a thickness at the start of the corner part (C). It is characterized in that it is set so as to gradually increase from the thickness.
[0009]
Furthermore, in the corner part forming die (10) according to claim 3, the thickness (T) of the press-fitting split mold part (16) is reduced at least at the center of the corner part (C). The height is set to about 1/2 of the height of.
[0010]
According to a fourth aspect of the present invention, there is provided a corner portion forming method, wherein an entire weather strip (1) for a vehicle having a hollow seal portion (2) attached to an attachment base (3) is formed by extrusion molding, and the extrusion molding is performed. 4. A method of forming a corner portion (C) by setting a part of an article (E) in a curved state and applying a heat treatment to form the corner portion (C), wherein the forming of the corner portion (C) is performed. Of the molding die (10) according to any one of the above.
[0011]
Still further, a weather strip (1) for an automobile according to claim 5 is a corner molding die (10) according to any one of claims 1 to 3, or a corner according to claim 4. It is characterized by being formed by a part forming method.
[0012]
Symbols in parentheses indicate corresponding elements or matters described in the drawings and the embodiments of the invention described later.
[0013]
According to the corner forming die according to claim 1 of the present invention, the press-fitting splitting portion that is press-fitted into the root portion of the hollow seal portion inside the corner portion has a substantially rectangular cross-section, and has a wall thickness. The hollow seal portion is set to a size that does not generate wrinkles (about 2 to 3 times the size of the conventional one), and the portion connected to the root of the hollow seal portion is lifted, so that the occurrence of seal wrinkles is reduced. It is possible to provide a weatherstrip for an automobile which is prevented beforehand and has excellent appearance.
[0014]
That is, by setting the thickness of the press-fitting split portion to be about two to three times as large as that of the related art, the hollow seal portion can be bent along the corner portion in a state where the root portion is extended. Therefore, since the stretched portion only returns to the original state and avoids the contracted state, it can be considered that the occurrence of wrinkles can be prevented.
[0015]
Since the weather strip formed by this molding die is an extruded product as a whole, no trace of connection is formed between the extruded product and the molded product as in the prior art. No holes are formed. Therefore, the appearance is excellent and the molding operation is easy.
[0016]
According to the corner portion forming die of the second aspect, in addition to the effects of the first aspect, the thickness of the center of the corner portion of the press-fitting split mold portion at the start of the corner portion is reduced. According to the corner portion forming die according to claim 3, the thickness of the press-fitting split mold portion is set to be gradually increased from the wall thickness, and the height of the hollow seal portion is at least at the center of the corner portion. Is set to about １ ／, the occurrence of wrinkles can be more reliably prevented.
[0017]
According to the method for forming a corner portion according to the fourth aspect, the corner portion is formed by the molding die according to any one of the first to third aspects. It is possible to provide a weatherstrip for an automobile which does not generate and has an excellent appearance. Further, since the weather strip formed by this forming method is an extruded product as a whole, no connection trace is formed, and no center hole is formed. Therefore, the appearance is excellent and the molding operation is easy.
[0018]
Furthermore, according to the weatherstrip according to the fifth aspect, the corners are formed by the corner part forming die according to any one of the first to third aspects or the corner part forming method according to the fourth aspect. In addition, no wrinkles occur in the hollow seal portion, and the appearance is excellent. Further, since the whole is an extruded product, no connection trace is formed, and no center hole is formed. Therefore, the appearance is excellent and the molding operation is easy.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to FIGS. 1 and 2, a corner forming method according to an embodiment of the present invention, which is performed using the corner forming die 10 according to the first embodiment of the present invention, will be described. FIG. 1 is a perspective view showing a molding die 10 according to a first embodiment of the present invention and a corner portion C of a weather strip 1 formed by a molding method, and FIG. 2 is a molding view according to a first embodiment of the present invention. It is sectional drawing which shows the metal mold | die 10. The same parts as those shown in the conventional example are denoted by the same reference numerals.
[0020]
The corner forming method according to the first embodiment of the present invention is used for forming an automotive weatherstrip 1 having a hollow seal portion 2 and a mounting base 3 having a substantially U-shaped cross section. The hollow seal portion 2 is attached to the attachment base 3 via bases 2a and 2b.
In this molding method, first, the entire weatherstrip 1 is molded by extrusion molding. Next, a part of the extruded product E is set in a molding die 10 in a state of being curved, and is heated to approximately 180 ° C. to 210 ° C. to perform a heat treatment, thereby forming a corner portion C. Although the weather strip 1 is made of EPDM in the present embodiment, the weather strip 1 is not particularly limited.
[0021]
Here, it is assumed that the molding die 10 to be used for the hot setting has a press-fitting splitting portion 16 for press-fitting into the base 2a of the hollow seal portion 2 located inside the corner portion C. 16 has a substantially rectangular cross-section, and the thickness T of the press-fitting split mold portion 16 is set to a thickness large enough to prevent the wrinkles W from being generated in the hollow seal portion 2. The portion 2c connected to the base 2a of the hollow seal portion 2 is lifted by the thickness T of the press-fitting split mold portion 16.
Note that, in the present embodiment, the thickness T is substantially equal to the height of the second split mold 12 described later at the center X of the corner portion C at a size approximately half the height of the hollow seal portion 2. It is set and gradually decreased toward both ends Y and Z, which are the start of the corner C that changes from a straight line to a curve. This reduction in size may be set linearly (FIG. 3A) or may be set curved (FIG. 3B).
[0022]
The molding die 10 according to the present embodiment includes a first split mold 11, a second split mold 12, a third split mold 13, a fourth split mold 14, and a fifth split mold 15, and the outer shape of the weather strip 1. It is modeling. The press-fitting mold 16 is provided at the upper end of the fifth mold 15.
[0023]
As shown in FIG. 1, the weather strip 1 according to the present embodiment has a thickness T of a press-fit split mold portion 16 that is press-fitted into a root portion 2 a of a hollow seal portion 2 inside a corner portion C, and Since the molding is performed by the molding die 10 according to the above-described embodiment which is set to a thickness that does not cause the wrinkles W, the appearance does not have the wrinkles W and the appearance is excellent.
[0024]
Further, since the weather strip 1 is an extruded product E as a whole, no connection trace S is formed between the extruded product E and the molded product M, and the center hole is not formed. Not formed. Therefore, it has an excellent appearance and is easy to mold.
[0025]
Next, a corner forming die 10 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing the corner portion forming die 10.
The molding die 10 is characterized in that a press-fitting concave portion 16a into which a lower end portion inside the corner portion C of the hollow seal portion 2 is press-fitted is formed in the press-fitting split mold portion 16, and the upper end is hook-shaped. By forming the press-fitting recess 16a, the gap G between the inner lower end portion of the hollow seal portion 2 and the mounting base 3 can be made substantially the same as that of the portion other than the corner portion C. Therefore, it is possible to provide the weather strip 1 having more excellent appearance. In the present embodiment, the gap G is set to approximately １ ／ of the thickness T of the press-fitting split mold portion 16.
[0026]
【The invention's effect】
According to the corner forming die according to the first aspect of the present invention, the thickness of the press-fitting split mold portion that is press-fitted into the root portion of the hollow seal portion inside the corner portion and the wrinkle W is formed on the hollow seal portion. Since the thickness is set to a size that does not occur, a weather strip for automobiles having excellent appearance can be provided.
Further, since the weather strip formed by this molding die is an extruded product as a whole, no connection trace is formed between the extruded product and the molded product as in the related art, and No holes are formed. Therefore, the appearance is excellent and the molding operation is easy.
[0027]
According to the corner portion forming die of the second aspect, in addition to the effects of the first aspect, the thickness of the center of the corner portion of the press-fitting split mold portion at the start of the corner portion is reduced. According to the corner portion forming die according to claim 3, the thickness of the press-fitting split mold portion is set to be gradually increased from the wall thickness, and the height of the hollow seal portion is at least at the center of the corner portion. Is set to about １ ／, the occurrence of wrinkles can be more reliably prevented.
[0028]
According to the method for forming a corner portion according to the fourth aspect, the corner portion is formed by the molding die according to any one of the first to third aspects. It is possible to provide a weatherstrip for an automobile which does not generate and has an excellent appearance. Further, since the weather strip formed by this forming method is an extruded product as a whole, no connection trace is formed, and no center hole is formed. Therefore, the appearance is excellent and the molding operation is easy.
[0029]
Furthermore, according to the weatherstrip according to the fifth aspect, the corners are formed by the corner part forming die according to any one of the first to third aspects or the corner part forming method according to the fourth aspect. In addition, no wrinkles occur in the hollow seal portion, and the appearance is excellent. Further, since the whole is an extruded product E, no connection trace is formed, and no center hole is formed. Therefore, the appearance is excellent and the molding operation is easy.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main portion inside a corner portion of a weather strip according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a molding die according to the first embodiment of the present invention.
FIG. 3 is a view showing a change in the thickness of a press-fitting split mold portion of a molding die according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view illustrating a molding die according to a second embodiment of the present invention.
FIG. 5 is a perspective view showing a main part inside a corner portion of a weather strip according to a conventional example.
FIG. 6 is a perspective view showing a main portion outside a corner portion of the weather strip shown in FIG. 5;
FIG. 7 is a cross-sectional view showing another molding die for a weather strip according to a conventional example.
FIG. 8 is a perspective view showing a main part outside a corner portion of another weather strip according to a conventional example.
[Explanation of symbols]
1 weather strip 2 hollow seal 2a root (corner side)
2b Base 2c Site 3 connected to base 2a Mounting base 10 Molding die 11 First split mold 12 Second split mold 13 Third split mold 14 Fourth split die 15 Fifth split die 16 Press-fit split die 16a Press-fit recess 20 Weather strip 21 Hollow seal portion 22 Center hole 30 Weather strip 31 Hollow seal portion 31a Root portion 31b Root portion 40 Molding die 41 First split die 42 Second split die 43 Third split die 44 Fourth split Mold 45 Fifth split mold 46 Press-fit split mold part C Corner part E Extruded product G Gap M Molded product S Connection trace T, t Thickness W Fold wrinkle X Center Y, Z end

Claims (5)

The entire automotive weatherstrip having a hollow seal portion attached to the mounting base is formed by extrusion molding, a part of the extruded product is set in a curved state, and hot-sealed to form a corner portion. A forming mold to be formed,
At the base of the hollow seal portion located inside the corner portion, the press-fitting splitting portion to be press-fitted has a substantially rectangular cross section, and the thickness of the press-fitting splitting portion is such that no breakage wrinkles occur in the hollow seal portion. A corner portion forming die, which is set thick in size and lifts a portion connected to a root portion of the hollow seal portion. 2. The corner part forming die according to claim 1, wherein a thickness of the center of the corner part of the press-fitting split part is set to be gradually larger than a thickness at a start of the corner part. The corner part molding according to claim 1, wherein the thickness of the press-fitting split part is set to at least about の of the height of the hollow seal part at least at the center of the corner part. Mold. The entire automotive weather strip having a hollow seal portion attached to the mounting base is formed by extrusion molding, and a part of the extruded product is set in a curved state, and then subjected to hot stiffening to form a corner portion. In a molding method for forming
A method of forming a corner portion, wherein the forming of the corner portion is performed by a molding die according to any one of claims 1 to 3. A weather strip for an automobile, formed by the corner forming die according to any one of claims 1 to 3, or a corner forming method according to claim 4.

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