JP3154033B2 - Molding method of molding part to be joined with extrusion part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a molded part to be joined to an extruded part in an automotive rubber weather strip.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS.
Conventionally, as shown in FIG. 1, a molding die 10 used for transfer vulcanization molding of rubber has a hollow portion 11 forming a surface of a molded portion roughly ground and ground by a machine, and then has a number of 500 to 600. Although the final finishing is performed with a water-resistant paper of a certain degree, the surface of the molded part obtained by this mold 10 is glossy, giving a sense of incongruity with the joined extruded part, or the inside of the hollow part 11 during the molding. If the fluidity of the rubber at the time of molding is insufficient, or if the skin layer of the molded part is thin and twisted, a dent is formed on the surface, and the appearance of the molded part is deteriorated.
There is a problem that the hollow portion 11 is easily soiled.

As a countermeasure, a cavity 11 of a mold 10 is provided.
Spraying glass beads and sand on the surface of the
In some cases, a so-called shot blast-forming mold is used in which the surface is ground to form fine irregularities on the surface of the hollow portion 11 of the mold 10.

However, in the above-mentioned conventional mold, the glass beads and sand are circulated and used to spray and scratch the surface of the hollow portion 11 of the mold 10. Since the glass beads and sand contain broken glass beads, sand, and metal powder generated by grinding, the obtained irregularities are angular, and the mold 10 of the molding part is formed.
There is also a problem that the mold releasability is poor.

[0005]

[SUMMARY OF THE INVENTION] A problem to be solved is, the molding method of the conventional extrusion unit and the molded part for bonding, glass beads sprayed on the surface, the glass beads were destroyed in the sand , Sand, and metal powder generated by grinding, the resulting irregularities are angular, and the mold releasability of the molded part from the mold 10 is poor.

[0006]

A description will be given with reference to FIGS. 4 to 6. The present invention relates to a method for molding a molded part to be joined to an extruded part of a rubber weather strip for automobiles. A 30 micron spherical temple 15 is formed, and then subjected to hard chrome plating. Using a molding die 10 having a hard chromium coating 20 formed thereon, transfer vulcanization molding is performed to form a mold for joining with an extruded portion. It is characterized by forming a part.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described. Reference numeral 10 denotes a mold for transfer vulcanization molding of rubber, and reference numeral 11 denotes a hollow portion which forms a surface of a molding portion of the mold 10, and mainly forms a surface of the molding portion. The surface of the cavity portion 11 of the mold 10 is formed with fine irregularities in order to make it not glossy, and a surface treatment is performed as described below to form the fine irregularities. That is, first, the surface of the hollow portion 11 has a diameter of 10 to 10.
A spherical dimple 15 is formed at least on a surface of a predetermined portion by hitting a 30-micron spherical blast material at high speed and performing so-called shot peening. Next, the entire surface of the hollow portion is subjected to hard chromium plating within 3 hours so that oxidation and dirt do not occur on the surface on which the spherical dimples 15 are formed.
0 is formed.

The operation will be described. Since the spherical dimples 15 are formed on the surface of the hollow portion 11 of the mold 10, the releasability of the mold from the mold 10 is improved, and the mold is removed. The surface becomes dull, and there is no sense of incongruity with the extruded part to be joined thereto, and the appearance is improved. Further, if it is within 3 hours after the formation of the spherical dimples 15, hard chrome plating can be performed, and the hard chromium film 20 can be reliably formed.

[0009]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the releasability from the mold 10 of the molding portion joined to the extrusion molding portion of the rubber weather strip for automobiles is improved, and the molding portion is formed. Has a matte surface, does not feel uncomfortable with the extruded part to be joined thereto, and the appearance is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a conventional mold.

FIG. 2 is an enlarged image model diagram of a main surface of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a main surface of FIG. 1;

FIG. 4 is a perspective view showing a mold according to the embodiment of the present invention.

FIG. 5 is an enlarged image model diagram of a main surface of FIG. 4;

FIG. 6 is an enlarged cross-sectional view of a main surface of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Die 11 Hollow part 15 Spherical dimple 20 Hard chrome coating

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Claims (1)

(57) [Claims] A hollow part (1) of a mold (10).
A spherical blast material is hit on the surface of 1) at a high speed and the diameter is 10
After forming a spherical dimple (15) of about 30 microns, it is subjected to a hard chromium plating treatment to form a hard chrome coating (2).
An extruded part in a rubber weather strip for automobiles, wherein a molded part to be joined to an extruded part is molded by transfer vulcanization molding using a molding die (10) in which 0) is formed. The method of forming the molded part to be joined with the mold.