Hollow structure rubber and fabric composite seal and its forming method

Abstract

The invention discloses a hollow structure rubber and fabric composite seal and a molding method thereof. The basic idea of ​​the method is to design the upper part of the mold and the mold according to the cross-sectional structure of the seal to be formed, with the lower part of the hollow structure as the boundary. The lower half of the product mold is vulcanized to form the upper half of the product and the lower half of the product, and then the upper half of the product and the lower half of the product are integrally vulcanized to form a hollow end-to-end closed structure. The method of the invention adopts integral vulcanization molding, the working surface of the seal is not butted or overlapped, and the appearance quality is good; the method divides the product into two parts for molding separately, which simplifies the molding operation process and solves the problem that the mold core cannot be damaged after the product is formed. The problem of taking out; the method solves the problem that the mold core of the hollow closed seal cannot be positioned, and the size of the produced seal is uniform and controllable.

Description

technical field [0001] The patent of the invention belongs to the field of rubber seal manufacturing, and specifically relates to a hollow structure rubber and fabric composite seal and a molding method thereof. Background technique [0002] Silicone rubber seals are usually formed by molding or extrusion 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 molding. The traditional method is molding at one time. This method is suitable for most products. However, as a hollow closed rubber and fabric composite seal, it is difficult to mold at one time. The mold core must be designed for the part to be formed. There are the following problems: First, the mold core cannot be positioned in the mold, which may easily cause the "eccentricity" 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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