JPH0755543B2 - Weather strip molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is capable of lengthening the mold forming portion of a weather strip, has a small number of joint portions per one, and has a core die take-out hole portion. The present invention relates to a method for forming a weather strip for a sashless door automobile, which has a reduced number of bonding steps and is excellent in appearance.

<Prior Art> A description will be given with reference to FIGS. 6 to 10.

Weather strip for conventional ash doors 12
Includes a hollow seal portion 14b made of an elastic material of a polymer material such as rubber, which is attached to the opening frame 1a of the body 1 through a retainer (not shown). In forming the hollow seal portion 14b, a weather strip is used. Extruded parts that make up
Among the mold forming parts 13 and the mold forming parts 14, since the mold forming part 14 needs to extract the core mold enclosed therein after the molding, the length of one mold cannot be increased so much. In order to form the weather strip of the book, it is necessary to join a large number of pieces, the number of joints 15 increases,
There are problems that the bonding man-hours are increased and the joint portion 15 impairs the appearance.

It is also possible to increase the length of the die that can be removed from the core die by lengthening the shape of the core die take-out hole 17 as shown in FIGS. 9 and 10. It is possible, but it is necessary to bond the core-type ejection holes 17 with an adhesive after the core-type ejection, and to close the core-type ejection holes 17. The larger the length of the core-type ejection holes 17, the greater the number of attachment steps. There is a problem to say. Note that there are 18 mounting holes in the figure.

<Problems to be Solved by the Invention> Since the conventional weather strip molding method for a sashless door vehicle has the above-mentioned problems, the length of the mold per piece is increased and the number of joints is reduced. However, there is an increasing demand for a method of forming a weather strip with improved appearance.

An object of the present invention is to provide a method for forming a weather strip that solves the above problems.

<Means for Solving the Problems> An explanation will be given with reference to FIGS. 1 to 6. In order to achieve the above-mentioned object, a method for forming a weather strip according to the present invention is one in which a die forming portion 4 of an extrusion forming portion 3 and a die forming portion 4 constituting a weather strip is formed along a longitudinal direction. Dividing into two, inserting the first core mold into one of the mold forming portions 4 divided into two, and performing primary molding to form a primary molded portion having an opening over the entire length; and combining with the primary molded portion, and It comprises a step of holding the second core mold having a small cross section in the primary molding part, and simultaneously forming the other mold molding part in the secondary molding and at the same time joining it to the primary molding part to form the entire cross section.

<Operation> Since the present invention is configured as described above, it is possible to easily take out the core mold from the long opening of the primary molding portion after the primary molding, and by combining with the secondary molding, It becomes possible to manufacture a long weather strip part piece by using the mold, and the joint part 5 is reduced by the part piece for forming one weather strip,
By forming the entire cross-section on it, the number of man-hours for bonding the core die take-out holes is reduced and the appearance is improved.

<Example> An example will be described with reference to FIGS. 1 to 6.
Reference numeral 1 is a body of a car door, 1a is an opening frame portion of the body 1, 2 is a weather strip attached along the opening frame portion 1a through a retainer, and the extrusion molding portion 3 and the molding portion 4 are joined together. It was formed by. Among them, the extrusion-molded portion 3 is mainly arranged in the linear region, and the mold-molded portion 4 is arranged in the corner region / cross-sectional shape change region. In the molding of the mold-molded portion 4, it is possible to change the dividing method depending on the cross-sectional shape. For example, for both the AA cross section and the BB cross section, first, the mounting base 4a is first formed.
And a hollow seal portion 4b that abuts the glass 6 and seals between the body 1 and the glass 6 along the lengthwise direction, and divides the first die into an outer mold having the outer shape of the hollow seal portion 4b. It is arranged and primary molded, the first core mold enclosed inside is extracted, and then the second core mold and another outer mold are combined with the hollow seal part 4b which is the primary molding part thereof, and the other mounting base is mounted. 4a
Is secondarily molded and joined to the hollow seal portion 4b to form the entire cross section. In the secondary molding, since the hollow seal portion 4b of the primary molding portion holds the second core mold and it is easy to prevent the movement and deformation thereof, the second core mold having a small cross section By inserting the insert, there is no problem in molding, and it is easy to remove the second core mold after secondary molding. Manufacture a long weather strip part piece with a 1-set mold. It is possible to reduce the number of joints 5 due to the partial pieces for forming one weather strip, and by forming the entire cross section thereof, the man-hours for attaching the core die take-out holes are reduced and the appearance is reduced. The property is improved.

In FIG. 3, the dividing method is different, the primary molding part is a combination of half of the mounting base 4a and most of the hollow seal part 4b, and the remaining secondary molding part is the mounting base 4a.
The remaining half is combined with the portion of the hollow seal 4b that does not come into contact with the glass 5, but the division into two along the longitudinal direction is the same as in the above embodiment. In the figure, 7 is a core extraction hole, and 8 is a mounting hole.

<Effects of the Invention> Since the present invention is configured as described above, the molding portion 4 can be greatly extended, the number of joints 5 in the longitudinal direction is reduced, and the appearance thereof is improved.

It should be noted that the number of man-hours is increased by splitting in the longitudinal direction and molding twice, but the man-hours are increased by increasing the length of the core extraction hole 17 in the conventional integral molding. This is economical and significantly less than the number of steps for pasting and closing the core extraction hole 7 in the conventional method of increasing the length of the mold segment.

[Brief description of drawings]

FIGS. 1 and 2 are sectional views taken along the lines AA and BB in FIG. 5 showing a method of dividing a mold forming portion in an embodiment of the present invention, and FIG. 3 is a modified embodiment diagram of FIG. The drawing is a sectional view taken along line CC of FIG. 5 and shows an extrusion-molded portion. FIG. 5 is a perspective view showing one weather strip attached to the portion D in FIG. 6, and FIG. 6 is a side view of a ashless door vehicle.
FIG. 7 is a sectional view taken along line EE of a conventional example showing an extrusion-molded portion, and FIG. 8 is a front view showing one weather strip at the time of conventional integral molding, FIGS. 9 and 10. [Fig. 3] is a perspective view showing a die-molded portion thereof. 1 …… Body 1a …… Opening frame 2,12 …… Weather strip 3,13 …… Extrusion molding part 4,14 …… Mold molding part 4a, 14a …… Mounting base 4b, 14b …… Hollow seal part 5 , 15 …… Joint part 6 …… Glass 7,17 …… Core extraction hole 8,18 …… Mounting hole

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Claims (1)

[Claims] 1. An extrusion molding portion (3) and a molding portion (4) constituting a weather strip, wherein the molding portion (4) is divided into two along the longitudinal direction, and the molding is divided into two. A step of inserting the first core mold into one of the parts to perform primary molding and forming a primary molded part having an opening over the entire length, combined with the primary molded part, and having a small cross section in the primary molded part. A method for forming a weather strip, which comprises a step of holding a child die, secondary molding the other die molding portion, and simultaneously joining the primary molding portion to form the entire cross section.