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Open casting molding and urethane wheels

Views: 60 Update date: Dec 01,2020

  urethane_rubber_wheelsUrethane wheels give full play to the characteristics of urethane, such as high load-bearing capacity, wear resistance, high torsion modulus, and good adhesion to metal. Some PU rubber wheels have metal and non-metal cores in the middle, and some do not. Depending on the usage, the processing and molding method can be normal pressure casting or compression molding. Mass production of urethane wheels generally uses normal pressure casting. Then mechanical processing is carried out, and the problems that should be paid attention to in the processing process are similar to those in processing PU rubber rollers.

  Open casting molding is the simplest and most commonly used molding method. In this method, the mixture of prepolymer and chain extender is poured into an open mold preheated to 80-120°C and coated with a release agent. After normal pressure vulcanization reaches the strength, it can be demolded and transferred to the post-vulcanization process. When pouring, you must be careful not to get air in to avoid air bubbles in the molding. It is better to use a pouring machine. For products with strict size requirements, the products need to be cut after molding. The shrinkage of elastomer needs to be considered when designing the mold. Larger products can also be poured by manual batch method if skilled. The mold strength requirement of this method is not high, and it can be processed and manufactured with soft metals such as aluminum, and it can even be processed with reinforced plastics. Urethane rubber rollers and wheels and other products are commonly produced by this method.

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