Composite sealing strip extrusion die and molding technology using same

Abstract

The invention relates to a composite sealing strip extrusion die and a molding technology using the composite sealing strip extrusion die. The extrusion die comprises a first flow channel piece, a second flow channel piece, a molding piece and a duckbilled piece, wherein the first flow channel piece, the second flow channel piece and the molding piece are connected into a whole; the duckbilled piece is formed by a connecting piece and a duckbill; the connecting piece is connected with the first flow channel piece; the duckbill penetrates through the first flow channel piece and the second flow channel piece; the centers of the connecting piece and the duckbill are respectively provided with a core material channel; the connecting piece is provided with a dense glue channel and a gelatin sponge channel around the duckbill; the first flow channel piece is provided with a first dense glue channel and a first gelatin sponge channel; the second flow channel piece is provided with a second dense glue channel and a second gelatin sponge channel; the molding piece is provided with a molding hole. When the extrusion die is used for molding, the core material is not needed to be pre-molded. The problems that the glue material covering the two sides of the core material is not uniform, the core material is missed and the like caused by the change of relative position of an opening die and the duckbill in the installation process can be effectively solved; the labor intensity of workers in the installation and disassembly processes of the opening die and the duckbill can be lightened, and the product switching time is shortened.

Description

technical field [0001] The invention relates to a mechanical mold and a molding process using the mold to produce products, in particular to a composite sealing strip extrusion mold and a molding process using the mold. Background technique [0002] Automobile sealing strip is one of the important parts of automobiles, widely used in doors, windows, body, engine box and trunk, etc. It has the functions of filling gaps, absorbing and reducing vibration, isolating noise, dustproof and waterproof, and ensuring ride comfort and other functions. The quality of the preparation of the sealing strip affects the protection of the passengers, electromechanical devices and accessories in the vehicle to a certain extent. [0003] See the sealing strip on the sheet metal of the car trunk figure 1 , which is a composite sealing product extruded from dense rubber, sponge rubber and core material. Its core is a low-carbon steel core material. . [0004] In production, three kinds of mat...

AI Technical Summary

Problems solved by technology

[0013] The die and duckbill used for the extrusion of existing composite sealing strip products are respectively fixed in the composite machine head through key connections. Since different products share a composite machine head for production switching, it is necessary to replace the dies and duckbills of different products every day. The process is cumbersome, and the work intensity of the production staff in the workshop is relatively high

[0014] Moreover, this structure is affected by the structure of the compound head of the extruder, and has high requirements for the relative position of the die and the duckbill.

After the die and the duckbill are installed and disassembled frequently, the flat keys that fix the die and the duckbill will loosen, and the keyway will be deformed, resulting in changes in the relative positions of the die and the duckbill, which will eventually lead to the rubber material and core of the extruded product. The shape of the cross-section of the product composed of different materials changes, and the core material is biased, and more seriously, the rubber material cannot fully wrap the core material, resulting in serious product defects such as core material leakage.

In order to improve the production quality, the core material must be preformed before composite extrusion molding, so the speed of the two extruders is set relatively low, and the temperature of the barrel is relatively high, which wastes energy. low production efficiency

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