JP2006044286A - Weather strip and manufacturing method for weather strip or stopping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weather strip having partially a hollow form part in a certain shape having the hollow form part of a constant form even if the hollow form part has a diameter no more than the predetermined value, and provide a manufacturing method for such a weather strip or a stopping through a simple procedure, accurately, and with good reproducibility. <P>SOLUTION: The weather strip 4 having partially a hollow seal part 4c includes an intermediate body consisting of a molding where a circumferential part forming the hollow form part is opened partially, wherein the hollow seal part 4c is formed by joining the open end of the intermediate body with the molding. The inside of the hollow form part is filled with the stopping F having a hollow part partially so as to hold the hollow form. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a weather strip and a method for manufacturing a weather strip or a filling, and more particularly, to a weather strip mounted on a sunroof or a door of an automobile, and a method for manufacturing a weather strip or a filling.

  In the automobile M shown in FIG. 1, various weather strips are attached to the peripheral edges of the sunroof S and the door portion D.

  Specifically, as a weather strip mounting structure that is mounted on the peripheral edge Sa of the sunroof S, for example, a structure as shown in FIG. 7 is known (see, for example, Patent Document 1). As shown in FIG. 8, a structure is known that is arranged continuously over the roof side rail and the front pillar of the vehicle body and seals the door D and the vehicle body opening as exemplified in FIG. reference). In any case, by having a hollow-shaped portion in part, flexibility and elasticity can be secured, and the improvement of the sealing property and the reinforcing effect can be utilized.

As a method of manufacturing such a weather strip, an extrusion molding method has been conventionally used, and products having various shapes according to specifications are used. At this time, in the production of a weather strip having a hollow part in part, the cross-sectional shape is likely to change in the hollow part after extrusion, and suppressing such deformation was an important issue. On the other hand, for example, (1) a method of changing the extrusion discharge amount by changing the number of revolutions of the extrusion screw, (2) a movable part is installed as an accessory in the extrusion die, and the movable part is moved by moving the movable part. Many proposals have been made, such as a method of changing the cross section, and (3) a method of dividing the extruded product immediately after the outlet of the extrusion die into a product shape and surplus by providing a second movable die. Has been applied to products. Specifically, as illustrated in FIG. 9, in extruding the molded body through the product openings 11a, 11b, and 11c of the extrusion die at the tip of the extruder, the change in the back pressure accompanying the change in the cross-sectional shape of the weather strip, A back pressure adjusting opening 12 is provided apart from the product opening, and the shape and area of the back pressure adjusting opening 12 are the same shape and area as the product opening changing portion 11c, and are linked to each other. For example, there is a method in which the same amount is reversed and held constant (see, for example, Patent Document 3).
JP 2002-219947 A JP-A-9-150855 JP-A-5-154890

  However, in the conventional method, when the hollow shape portion has a predetermined diameter or less, it is very difficult to maintain the shape, and for example, a special method illustrated in FIG. 10 is adopted. was there. That is, it is a method of forming the hollow portion by providing the core 22 in the die portion 21 of the extruder. However, even in such a method, for example, when the inner diameter is 3 mm or less, it is difficult to withstand the strength because of the necessity to make the core 22 thinner, and it is difficult to form a certain hollow shape. That is, a method for forming a hollow-shaped portion by extrusion molding that can be applied even when the hollow-shaped portion has a predetermined diameter or less has been a big problem.

  In particular, the hollow portion is indispensable not only in the case where a hollow shape portion is provided in a part of the weather strip but also in order to ensure the flexibility and elasticity of the filling inserted for the purpose of reinforcing the hollow shape portion. There has been a demand for processing of a hollow portion having a small diameter with high accuracy.

  Therefore, the present invention provides a weather strip having a hollow shape portion having a certain shape even when the hollow shape portion has a predetermined diameter or less in a weather strip having a hollow shape portion in part. It is another object of the present invention to provide a method for forming a weather strip or a filling having a good accuracy and reproducibility by a simple method.

  As a result of intensive studies, the present inventors have found that the above object can be achieved by the following method for producing a weather strip and a weather strip or filling, and have completed the present invention.

  The present invention relates to a weather strip having a hollow part in a part thereof, wherein a molded body in which a part of a circumferential part forming the hollow part is opened is used as an intermediate body, and an open end of the intermediate body is used as a molded body. It has the hollow shape part formed by joining to.

  That is, when the hollow shape portion has a predetermined diameter or less, it is not a single extrusion molding by a combination with the die portion or the core of the extruder, but a part of the revolving portion that first forms the hollow shape portion by the extruder It was devised that a weather strip having a hollow-shaped portion can be provided in a part with high accuracy and reproducibility by preparing an open intermediate and further forming a hollow shape based on the intermediate. is there. By forming the hollow shape through these two steps, it has become possible to arbitrarily form the shape or inner diameter of the hollow shape portion that meets the specifications. Moreover, this invention is applicable not only to a weather strip but the filling inserted in the weather strip mentioned later.

  The present invention is the above-mentioned weather strip, characterized in that the hollow shape portion is sealed with a filling part having a hollow portion in part to hold the hollow shape.

  Maintaining a hollow shape in a part of the weather strip is effective in securing a sealing property with a body such as a door or a sunroof, and the hollow shape portion plays an important role. On the other hand, in the corner portion and the like, the hollow shape portion is deformed together with the main body, and therefore it is effective to enclose the filling to maintain the hollow shape. In particular, it has been devised that, by making the filling body a hollow body, the filling itself has predetermined elasticity and flexibility, and is effective in ensuring the sealing performance of the hollow seal portion.

  The present invention relates to a method for producing a weatherstrip or filling, comprising: (1) extruding rubber from an extrusion mold, and molding an intermediate body that is partially opened to form a revolving part when completed; (2) the resin It is characterized in that it comprises a step of pressing a part of this part against another part by a roller, (3) forming a hollow shape part, and (4) vulcanizing.

  In producing a weather strip or filling having a hollow shape as described above, in order to ensure a stable predetermined shape even when the hollow shape portion has a predetermined diameter or less, a plurality of hollow shape portions are molded. It has been devised that it is effective to carry out in this step. In other words, an intermediate body having an open end is extruded from the mold in the first stage, and the open end is pressed against the main body and fixed in the second stage. Can be formed. Further, by vulcanizing the hollow-shaped portion formed in an unvulcanized state in the next stage, it becomes possible to produce a weather strip or a filling having a small-diameter hollow-shaped portion with high accuracy and reproducibility.

  The present invention is the above-described method for producing a weather strip or filling, characterized in that the shape of the roller corresponding to the pressing portion has a concave portion in the central portion.

  As described above, in the second stage of the weatherstrip or filling production method, when the open end is pressed against the main body to form the hollow shape portion, the shape of the roller to be pressed has a recess in the center, and the open end is It has been found that a hollow portion having a small diameter can be formed accurately and reproducibly by being positioned in the recess. That is, since the pressing position is fixed by the concave portion, even a hollow portion having a very small diameter can be manufactured accurately and with good reproducibility.

  As described above, according to the present invention, it is possible to provide a weather strip having a hollow shape portion having a certain shape even when a weather strip having a hollow shape portion having a predetermined diameter or less or a filling is produced, and a simple method. It is possible to provide a method for forming a weather strip or a filling that is accurate and reproducible.

Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 illustrates an automobile M having a sunroof S and a door D to which a weather strip according to this embodiment is attached. First, an explanation will be given focusing on the case where the weather strip according to the present invention is attached to the sunroof S.

  FIG. 2 exemplifies the overall structure of the weather strip according to the present invention formed so as to fit the shape of the sunroof S, and has two mold forming portions K and two core punched holes C. . In the four corners, a filling F is enclosed as a reinforcing material, and the shape is maintained. In the case of using a weather strip, a passage hole may be provided in the weather strip to drain rainwater that has entered the vehicle. However, in order to secure the workability of the through hole or the drainage channel, the mold forming part K is provided with a through hole. It is preferable to provide a through hole. Further, when the weather strip is mounted on the automobile M, the mold forming portion K is disposed so as to be the lowest, so that rainwater that has flowed into the vehicle has its own weight through holes, a hollow seal portion and a cored hole C described later. It can be drained outside the vehicle.

  FIG. 3 shows a cross-sectional structure of a rubber weather strip 4 according to the present embodiment, which is a weather strip 4 in which a filling F is enclosed, and has a hollow shape portion formed through the above intermediate, A filling F having a hollow portion formed through the intermediate is inserted.

  Specifically, the groove portion of the solid rubber base portion 4b is fitted into the weather strip mounting portion 2a of the stay 2, the tip portion of the lip seal portion 4a is elastically contacted with the indoor side surface of the sunroof lid 3, and the hollow seal portion 4c is formed. The sunroof S has a waterproof function by elastically contacting the opening end of the body 1. A filling F having a hollow main body portion is inserted into the hollow seal portion 4c at each corner, and the hollow shape is maintained while maintaining a state with little deformation against bending. The water guide valve portion 4d has a function of guiding rainwater in the space 5 to a through hole (not shown) by being elastically contacted with the stay 2 in a plane, and the rainwater is discharged through the through hole. . The water guiding valve portion 4d is not necessarily required all around the weather strip 4. If rainwater can be guided by its own weight, it may be provided only on a part of the weather strip 4 or may be omitted all around the weather strip 4. Is possible.

  Here, the weather strip 4 is continuously manufactured by a later-described extrusion method using a rubber material such as polychloroprene rubber or ethylene propylene rubber (EPDM) that is generally used. The lip seal portion 4a, the hollow seal portion 4c, and the water guide valve portion 4d illustrated in FIG. 3 are preferably formed of foamed rubber. In addition, since the filling F is required to have a predetermined strength and elasticity, the filling F is continuously manufactured by an extrusion method described later with a rubber material such as polychloroprene rubber or ethylene propylene rubber (EPDM). Is preferred.

  The lip seal portion 4a is attached to the stay 2 with the weather strip 4 and assembled to the sunroof lid 3 so that the lip seal portion 4a is elastic with the lower surface (interior surface) of the sunroof lid 3 as shown in FIG. It comes into contact and exhibits sealing properties. According to this configuration, the lip seal portion 4a and the lower surface of the sunroof lid 3 are in line contact and have excellent sealing properties. Further, the spring elasticity of the elastic contact between the lip seal portion 4a and the lower surface of the sunroof lid 3 can be easily set by changing the thickness of the lip seal portion 4a. Note that the lip seal portion 4a has an example in which the cross-sectional shape is a "<" shape, but at least the tip portion is inclined toward the end portion with respect to the sunroof lid 3, and the tip portion of the sunroof lid 3 is closer to the tip portion. The shape is not limited as long as it can be elastically contacted to the end side.

  The hollow seal portion 4c is formed in a loop shape having a cavity inside, and a space capable of maintaining a sealing property is widened between the hollow seal portion 4c and the automobile body 1 to be elastically contacted. That is, even if the sunroof lid 3 is contracted when closed, the hollow seal portion 4c follows the contracted function and the sealing performance is maintained. The size of the hollow seal portion 4c is set to a size that can be sufficiently sealed even if the dimensional change of the sunroof lid 3 occurs.

  Further, the shape of the filling F is not limited as long as the hollow shape inside the hollow seal portion 4c can be maintained, but the body portion Fa having the hollow portion Fc as shown in FIG. It is preferable to be formed by a protrusion Fb having a predetermined length connected to it. By being formed by the body portion Fa having the hollow portion Fc, even if the inner surface of the hollow seal portion 4c is in close contact with the outer surface of the filling F, the hollow portion Fc maintains a hollow shape having a function such as a drainage channel. Can do. In addition, by having the protrusion Fb of a predetermined length connected to the main body part Fa, it is possible to maintain a smooth drainage function without closing the outlet of the hollow seal part 4c side of the through hole, and the protrusion Fb. By setting the length, the filling F can be set at an arbitrary position inside the hollow seal portion. For example, it is possible to use a filling F in which a main body part Fa has a cylindrical body with an outer diameter Ra = 5 mm and an inner diameter Rb = 2 mm, and a projection part Fb has a plate-like body with a length L = 5 mm and a thickness T = 2 mm. It is.

  As for the shape of the filling, specifically, if emphasis is placed on workability, the form as shown in FIG. 4A is preferable, but various forms as shown in FIGS. 4B to 4J are applicable. is there. That is, the shape of the main body portion Fa is not limited to a cylindrical shape, and may be an elliptical columnar shape or a polygonal columnar shape as shown in FIG. 4 (B), but the unevenness Fd is further formed on the outer surface as shown in FIG. 4 (C). If it has a shape, the inner surface of the hollow seal portion 4c and the convex portion Fd are in contact with each other, and a hollow state can be formed between them, and the localization of the drainage flow path is prevented and accumulation of dust and the like is prevented. Is excellent in terms of In addition, the hollow portion Fc does not need to be circular, and in the present invention, it is mainly used to be provided at the corner portion. Therefore, an elliptical shape that is long in the bending direction as shown in FIG. Further, the protrusion Fb is generally plate-shaped as described above, but is not limited to this, and various shapes can be applied as shown in FIGS. is there. In each case, the shape was devised in consideration of workability or strength while maintaining a hollow state.

  Next, a method for producing a weather strip or filling having a hollow part in a part according to the present invention will be described. Here, although the simplest shape of the filling will be described in detail, it goes without saying that this method can be applied as a method of forming a hollow shape portion even in a complicated shape in an actual weather strip or filling.

  The method for producing a weather strip or filling according to the present invention includes the following steps: (1) a step of extruding rubber from an extrusion mold, (2) a step of pressing a part of the resin against another part by a roller, (3) It has the process of forming a hollow shape part, (4) It is characterized by having a vulcanization | cure process.

(1) Step of Extruding Rubber from Extrusion Die As shown in FIG. 5 (A), by extruding rubber from the extrusion port 7 of the extrusion die 6, a part forming the circular portion is opened when completed. The intermediate body 8 having the open end 8a can be molded. Extrusion speed and temperature conditions need to be arbitrarily set depending on the shape or material of the intermediate body 8, but if a shape body such as the EPDM filling F shown in the figure is formed in an unvulcanized state, The extrusion speed is usually about 5 to 30 m / min, preferably 10 to 20 m / min, and the temperature is preferably 60 to 110 ° C.

(2) Step of pressing a part of the resin against another part with a roller As shown in FIG. 5B, the roller 9 is pressed against the open end 8a of the intermediate body 8 and gradually the other part of the intermediate body 8 is pressed. By pressing against 8b, a revolving part as shown in FIG. 5C can be formed. At this time, it is preferable that the open end 8a and the other portion 8b have a shape as shown in FIG. 5 (D) or (E). That is, in order to form a hollow portion having a predetermined strength, it is effective to increase the contact area between the open end 8a and the other portion 8b as shown in FIG. This is because, in order to form the hollow portion, it is effective to fix the pressing position as shown in FIG.

(3) Step of forming a hollow shape portion In the case of FIG. 5C, the formed circular portion forms the hollow seal portion 4c as it is. However, in the case of a complicated shape or when high dimensional accuracy of the hollow seal portion 4c is required, the hollow seal portion 4c corresponding to the specification is formed using the shaping jig from the other side in addition to the roller 9. It is also possible. Specifically, when the weather strip 4 as shown in FIGS. 3 (A) and 3 (B) is manufactured, the roller 9 is placed below the open end 8a of the intermediate body 8 as shown in FIGS. 5 (F) and 5 (G). The hollow seal portion 4c having a more preferable shape can be formed by using a jig that supports or presses the open end 8a from the left side of the drawing as well as pressing.

(4) Vulcanization process After the hollow-shaped portion is formed, a vulcanization process is performed to fix the shape of the weather strip 4 or the filling F. The vulcanization conditions need to be arbitrarily set depending on the shape or material of the weather strip 4 or the filling F, but when vulcanizing a shaped body such as the EPDM filling F shown in the figure, the temperature is 200 to 270. Heat treatment at 0 ° C. is preferred.

  As described above, the intermediate body 8 having the open end 8a is extruded from the extrusion die 6 in the first stage, and the open end 8a is pressed and fixed to the main body intermediate body 8 in the second stage, and further, unvulcanized. By vulcanizing the hollow seal portion 4c formed in the state in the next stage, it is possible to manufacture the weather strip 4 or the filling F having the hollow seal portion 4c with a small diameter accurately and reproducibly by a simple method. Become. In particular, even when the hollow seal portion 4c is equal to or smaller than a predetermined diameter, it is possible to form a hollow shape portion having a stable predetermined shape by making the plurality of steps.

  Moreover, it is preferable that the shape of the said roller 9 has the recessed part 9a in the center part. That is, as illustrated in FIG. 6, the shape of the roller 9 to be pressed has a concave portion 9a in the center, and the open end 8a is positioned in the concave portion 9a, so that the hollow seal portion 4c having a very small diameter is obtained. Can be produced accurately and reproducibly. In particular, when it is desired to accurately form the hollow seal portion 4c in a desired shape, the accuracy can be further improved by making the shape of the concave portion 9a the same.

  The above has described weather strips or fillings used for sunroofs or doors, but the same technique can be applied to members that can be opened and closed other than sunroofs or doors, and is not limited to the above. Needless to say.

1 is a perspective view of an automobile to which a weather strip mounting structure according to the present invention is attached. Overall view of weather strip according to the present invention Sectional drawing of the attachment state of the weather strip which concerns on this invention Explanatory drawing which illustrates the form of the filling of the weather strip which concerns on this invention Explanatory drawing which illustrates the manufacturing process of the filling of the weather strip which concerns on this invention Explanatory drawing which illustrates the roller for hollow shape part formation which concerns on this invention Sectional view of the mounting state of a conventional weatherstrip used for sunroof Sectional view of the mounting state of a conventional weatherstrip used for the door Explanatory drawing of the extrusion molding apparatus of the weather strip 1 of a prior art Explanatory drawing of other extrusion molding apparatus of prior art weather strip

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 2 Stay 2b Weather strip mounting part 3 Sunroof lid 4 Weather strip 4a Lip seal part 4b Solid rubber base part 4c Hollow seal part 4d Water guide valve part 5 Space 6 Mold 7 Extrusion port 8 Intermediate body 8a Open end 9 Roller 9a Concave part D Door part F Filling Fa Body part Fb Projection part K Molding part M Car S Sunroof

Claims (4)

  A weather strip having a hollow part in a part thereof, wherein a molded body in which a part of a circumferential part forming the hollow part is opened is an intermediate body, and an open end of the intermediate body is joined to the molded body. A weather strip having a formed hollow portion.   The weather strip according to claim 1, wherein the hollow shape is retained by sealing a filling part having a hollow part in the hollow shape part.   A method for producing a weatherstrip or filling according to claim 1 or 2, wherein (1) rubber is extruded from an extrusion mold, and an intermediate body that is partially opened to form a revolving part when completed is formed, 2. A method for producing a weather strip or filling, comprising: 2) pressing a part of the resin against another part with a roller, (3) forming a hollow shape, and (4) vulcanizing. 4. The method of manufacturing a weather strip or filling according to claim 3, wherein the roller corresponding to the pressing portion has a concave portion in the center.

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