Silicone cnc prototype production steps

The characteristics of the silicone prototype model are: the viscosity of the silicone is thin, easy to operate, no deformation, no shrinkage, easy to remove the mold, the surface of the mold is smooth, and the simulation effect is good. 1. Silica gel is a flowing liquid, component A is silica gel, and component B is curing agent. The amount of curing agent added is usually 2% -3%. For example, take 100 grams of component A silica gel, 2 grams of solidification agent, add the curing agent to the silica gel, and stir evenly. (Note: The ratio of the silica gel to the curing agent must be accurately weighed on the electronic scale. According to the local temperature, the curing agent can be added according to this ratio at around 25°C). If the local temperature is 10°C, the amount of curing agent can be added to 5%. If the local temperature is around minus 5°C, no matter how much curing agent you add, it will not react with the silica gel, and it will not cure for a long time; if the local temperature is 38-45°C, the same quality silica gel, the same curing agent, and the addition of curing agent 1% is fine. 2. First of all, you have to deal with the original model or the product to be copied. Silicone hand model, because the product or model you copied has not been polished or polished, in fact the model or product itself is not smooth or perfect, the mold you made with column layer silicone is not good enough, and the actual poured product is not smooth enough. 3. Operation method of split mold or sheet mold: apply the vacuumed silica gel to the construction by brushing or pouring. Before painting, first apply a layer of release agent or release agent to the product or model you want to copy, and then paint the silicone on the product (note: it must be painted evenly). After waiting for 30 minutes, paste the surface A layer of gauze or glass fiber weft cloth to increase the strength, and then apply a second layer of silica gel and other silica gel to dry, and then make the outer mold. The outer mold can use materials such as gypsum or resin. 4. The operation method of filling mold or pouring mold: filling mold or pouring mold is used for relatively smooth or simple products, that is, to surround the product or model you want to copy with plastic board or glass plate, and pump it Vacuum silica gel is directly poured on the product, after the silica gel is dry and formed, take out the product, and the mold is formed (Note: the perfusion mold is usually made of soft silica gel, which is easier to demould and will not damage the inside of the silica gel mold products), the above is the whole process of the use and operation of hand-made silicone. 5. Vacuum treatment, according to a certain ratio, mix the silica gel and curing agent evenly, and then carry out vacuum treatment. Because the time of mixing the silicone and the curing agent will produce air bubbles, if the air bubbles are not vacuumed, the silicone mold made will have many pores, the mold itself will reduce the tension, the number of times of turning over the mold is less, and the mold itself will not be smooth. , directly affect the quality of the product.