Hollow-structure rubber and fabric composite sealing element and forming method thereof

Abstract

The invention discloses a hollow-structure rubber and fabric composite sealing element and a forming method thereof. According to the basic idea of the method, according to the section structure of the to-be-formed sealing element, the lower part of a hollow structure is used as a boundary, and a product upper half part mold and a product lower half part mold are designed for vulcanizing and forming a product upper half part and a product lower half part; and then the product upper half part and the product lower half part are integrally vulcanized and molded to form a hollow end-to-end closedstructure. According to the method, integral vulcanization and forming are adopted, the working surface of the sealing element is not in butt joint or lap joint, and the appearance quality is good; according to the method, a product is divided into the two parts to be formed respectively, the mold filling operation process is simplified, and the problem that a mold core cannot be taken out afterthe product is formed is solved; and according to the method, the problem that the hollow closed sealing element mold core cannot be positioned is solved, and the produced sealing element is uniform and controllable in size.

Description

technical field [0001] The patent of the invention belongs to the field of manufacturing rubber seals, and specifically relates to a composite seal made of rubber and fabric with a hollow structure and a forming method thereof. Background technique [0002] Silicone rubber seals are usually molded or extruded by hot air vulcanization. For rubber and fabric composite seals with complex shapes, extrusion molding is difficult in the prior art, and molding methods are usually used. Mold structure design is one of the most important factors in compression molding. The traditional method is one-time molding. This method is suitable for most products, but as a hollow closed rubber and fabric composite seal, it is difficult to mold one-time molding. The mold core must be designed for molding, and there are the following problems: first, the mold core cannot be positioned in the mold, which may easily cause the "eccentric" problem of the seal product; second, the mold core cannot be ...

AI Technical Summary

Problems solved by technology

Mold structure design is one of the most important factors in compression molding. The traditional method is one-time molding. This method is suitable for most products, but as a hollow closed rubber and fabric composite seal, it is difficult to mold one-time molding. The mold core must be designed for molding, and there are the following problems: First, the mold core cannot be positioned in the mold, which may easily cause the "eccentric" problem of the seal product; second, the mold core cannot be taken out after molding, and the product needs to be damaged if it is taken out

[0003] In the past, some products were molded by inflatable vulcanization, that is, the mold core was not used inside, and the pressure was applied by inflation. However, the molding process of this method is complicated and requires a special inflation device. At the same time, it has high requirements for the preparation process of semi-finished products. The quality and size are often difficult to achieve the desired goal, and the product qualification rate is low

Another molding method is to use a water-soluble "salt core" as the mold core for molding. After molding, inject water into the seal to dissolve the "salt core", but the rubber material will flow during the molding process. Extrusion deformation breaks, resulting in changes in the internal shape of the product, and the core cannot be positioned, prone to "eccentricity" phenomenon

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