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How to understand the rubber molding process

Compression molding is an attempt and a real method of manufacturing simple rubber parts. The process is similar to that produced by Waffle - unvulcanized rubber is placed into the mold cavity, which is then closed and heated for a given amount. When the parts have cured, they are removed from the mold.
Intermediate precision of compression molding production, which is defined as meeting the following quality criteria:
Rubber Manufacturers Association, RMA-A2
RMA Class A O Ring Tolerance
ISO3601-1 seal tolerance
ISO3601-3 level N and S tolerances
Compression moulds can produce the widest range of part sizes. Parts can range in size from 0.024 inches to 30 inches in diameter.
Compression molding process
Compression molding includes several steps:
The uncured rubber compound is formed into an appropriate shape and size based on the final part structure. This uncured rubber is called a preform - it is ready to be formed, or molded. Each mold will have different shapes and sizes of prefabricated pieces of the best. When an optimal preform is determined, it has two dimensions and its shape tolerances in order to correctly ensure the form of the part is important. Too much material is a waste, and may cause the flash to become too thick, while too little material may cause some voids.
The preform is placed in the cavity of a heated mold. The mold is then closed. Heat and pressure are applied to the compression press. The presses used in production use programmable logic controllers to monitor and control key parameters such as temperature, pressure, and time to ensure that forming takes place in a predetermined tolerance window.
Then open the mold. The cured rubber piece is removed along with its flash.
It can then include trimming, post-curing, automatic inspection, and packaging by moving through the manufacturing operations.

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