Mold Technology: Silicone Rubber Mold Manufacturing Method and Notices
Rubber mould is one of the simplest methods in rapid tooling. Generally, RP prototype is replicated with silica gel, but its life is very short, only about 10-30 pieces! It has good elasticity and duplication performance. Silicone rubber duplicating die can be directly poured without considering the slope of drawing die, without affecting the dimensional accuracy, and has good partition. Then cut along the predetermined parting line and take out the master die.

Room temperature vulcanized silicone rubber can be divided into two types: additive and condensation.

The raw material and formula are made of special mold silicone rubber. The product is sold in double packaging. Component A is rubber and component B is catalyst. The room temperature, the strength and hardness of the die should be taken into account to determine the weight ratio of AB component.

At room temperature of 20-25 degrees, A:B = 100:1.5. When the ventricle is low (but not below 10 degrees), 0.1-0.3 copies of component B should be added appropriately. High room temperature reduced 0.1-0.3 copies in group B. The specific method is to determine the total dosage according to the die volume, and then weigh components A and B in proportion accurately, and mix them evenly in a vessel.

Moulding: The prepared material can be poured into the clean material to be imitated. In order to save material, a thinner die can be made, and it can also be painted in stages. In order to increase the pulling force of the die, the gauze can be pasted and so on. It can be cured into elastomer in 2 hours at room temperature of 20 degrees, and can be used in one day.