JP3950069B2 - Manufacturing method of weather strip for automobile - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method of manufacturing a weather strip provided with a welt having a U-shaped cross section sandwiched between opening edges of an automobile.
[0002]
[Prior art]
In the conventional method of manufacturing a weather strip, a welt 13 containing a core material 12 is first extruded in a flattened state as shown in FIG. 4, and then the welt 13 is U-shaped by bender processing as shown in FIG. It is bent into a shape. The core material 12 is a metal material or a resin material, and the welt 13 is made of a synthetic rubber solid material, and is provided with large and small holding lips 14 and 15 and an interior lip 16, and a hollow seal portion 17 of a sponge material. Is provided.
[0003]
[Problems to be solved by the invention]
However, when the welt 13 is bent and formed into a U-shaped section by bender processing as described above, the tip of the holding lip 14 enters and exits as shown by the dotted line as shown in FIG. It is difficult to become a fixed position that holds the desired distance C.
Further, as another manufacturing method, even when the welt is extruded while the core material 12 having a substantially U-shaped cross section is embedded in advance, and the welt is bent into a U-shaped cross section, both the holding lips 14 as shown in FIG. , 15, it is difficult to always maintain the desired distance C. Therefore, in any of the above cases, as indicated by a chain line in FIG. 5, there is a problem that insertability and retention of the opening edge of the automobile into the flange F are impaired.
Therefore, in view of such a conventional problem, the present invention makes it possible to always maintain the tips of both holding lips projecting on both side walls of the welt at a desired interval, thereby impairing the insertability and holding ability to the opening edge of the automobile. An object of the present invention is to provide a method of manufacturing a weather strip for automobiles that is prevented from being disturbed.
[0004]
[Means to solve the problem]
In order to achieve such an object, the present invention shown in FIGS. 1 to 3 is a method of manufacturing an automotive weather strip 1, 9 having a welt 2, 10 containing a core material 3, 11 having a U-shaped cross section. A state 6 in which both ends of the holding lips 4, 5 projecting from both inner wall surfaces 2 a, 2 b of the welt 2 are combined, or a state in which the tip of one holding lip 4 is connected to the opposing inner wall surface 2 b 6. Is a method for manufacturing a weather strip for automobiles, in which the holding lip 4 and the connecting portion 6 at the tip of the holding lip 4 are divided .
[0005]
【Example】
Hereinafter, embodiments of the first invention will be described in detail with reference to the drawings. As shown in FIG. 1, a method for manufacturing a weather strip 1 for an automobile is a method in which a welt 2 is extruded and molded into a U-shaped cross section while embedding a metal core 3 that is previously bent into a U-shaped cross section. . The welt 2 is a solid material made of synthetic rubber, and the tip of a long holding lip 4 projecting from one inner wall surface 2a of both side walls and the tip of one holding lip 5 projecting from a plurality of short walls to the opposing inner wall surface 2b. Are extruded in a combined state 6. In addition, the welt 2 is provided with an interior lip 7 and a hollow seal portion 8 made of a sponge material.
[0006]
After the extrusion of the weather strip 1, the joint portions 6 at both ends of the holding lips 4 and 5 of the welt 2 are divided by being thinned and torn or cut with a knife. Therefore, both ends of the holding lips 4 and 5 are always kept at a desired interval C. Therefore, it is expected that the weather strip 1 can always be easily inserted into the flange F at the opening edge and that the holding property is improved.
Further, unlike the case where both ends of the holding lips 4 and 5 are coupled as described above, as another embodiment, as shown in FIG. 3, the welt 2 couples the tip of one holding lip 4 to the opposing inner wall surface 2b. In some cases, it is extruded into a U-shaped cross section.
[0007]
FIG. 2 shows an embodiment of the second invention. In the welt 10 of the weather strip 9, a highly rigid thermoplastic resin core 11 having a substantially L-shaped cross section is lined inside a synthetic rubber solid material. In the state, it is extrusion-molded into a U-shaped cross section. At the beginning of extrusion, both ends of the holding lips 4 and 5 are in a combined state 6 as in the above embodiment.
Accordingly, the core material 11 is surrounded by a rubber material in a bag shape, and even when the temperature in the furnace becomes 200 ° C. or higher during rubber vulcanization, the heating is not directly transmitted to the core material 11 of the resin material. Does not soften and maintains a predetermined shape. The adhesive portions 6 at both ends of the holding lips 4 and 5 are then divided so that both ends are always maintained at a desired distance C, and good insertability and holding ability to the flange F at the opening edge of the weather strip 9 are expected. it can.
[0008]
【The invention's effect】
The automobile weather strip manufacturing method of the present invention has a cross-section U in a state where the tip of both holding lips protruding from both inner wall surfaces is joined, or the tip of one holding lip is joined to the opposing inner wall surface. Since it is extruded in the shape of a letter and then the joint portion is divided, the tip of the holding lip is always kept at a desired interval, and good insertability and holding ability to the opening edge of the weather strip are expected. The In addition, there is a feature that the weight of the welt core material is reduced by using a resin material.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first invention of a method for producing a weather strip for an automobile.
FIG. 2 is a sectional view showing a second aspect of the present invention.
FIG. 3 is a cross-sectional view showing another example of the above.
FIG. 4 is a cross-sectional view of a conventional method for producing a weather strip for an automobile.
FIG. 5 is a cross-sectional view showing a state where the weather strip is bendered.
[Explanation of symbols]
1, 9 Weather strip 2, 10 Welt 2a, 2b Inner wall surface 3, 11 Core material 4, 5 Holding lip 6 Joining portion C Desired spacing

Claims (1)

  In a method of manufacturing a weather strip for automobiles having a welt having a U-shaped cross section and containing a core material, both ends of the holding lip projecting from both inner wall surfaces of the welt are joined, or one holding lip A method for producing a weather strip for an automobile, comprising: extruding a U-shaped cross section in a state where the front ends are connected to opposing inner wall surfaces, and then dividing a connecting portion at the front end of the holding lip.

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