Silicone has good simulation, strength and very low shrinkage. The use of the material to create flexible mold is simple, no special technology and equipment, just a few hours at room temperature can be made. Silicone mold can withstand repeated use and poor operation, to maintain the prototype parts and mass production of products, precision tolerances, and can directly process the shape of complex parts, eliminating the milling and grinding process, and stripping is very easy, greatly shortened product trial cycle, while mold modification is also very convenient. In addition, because the silicone mold has good flexibility and elasticity, for the complex structure, fine pattern, no demolition of the slope or with the inverted mold deviation and deep groove with the parts, the workpiece can be directly removed after casting , Which is unique to its other molds. Here to introduce the silicone mold making process

Shouban model prototype surface treatment
RP rapid prototyping prototype in its stacking section between the general existence of the step pattern or gap, need to be polished and anti-seepage and strengthening treatment, in order to improve the hand plate prototype surface smoothness and resistance to moisture and heat resistance. Only the hand plate prototype surface is smooth enough to ensure the production of silicone mold surface roughness, and thus ensure that the product has a higher surface quality and easy to remove from the silicone mold.

Production type frame and fixed hand plate prototype
According to Shouban prototype geometric size and the use of silicone mold design requirements of the shape and size of casting box, the size of the box should be moderate. Before fixing the prototype of the hand plate, it is necessary to determine the position of the parting surface and the gate, and the determination of the parting surface and the gate position is very important. It directly affects the quality of the pouring hand plate model and the good quality of the Shouban model. Bad. When the parting surface and gate selected and processed, they will be hand plate prototype fixed in the box.

Silicone metering, mixing and vacuum defoaming
The amount of silica gel should be measured according to the size of the box and the density of the silica. The measured silica gel is added to the appropriate proportion of hardening agent, stirring even after vacuum degassing. The defoaming time should be based on the degree of vacuum achieved.

Silicone casting and curing
The silica gel mixture is vacuum degassed and poured into a frame with a fixed prototype. In the casting process, should master a certain skill. After the silica gel pouring, in order to ensure that the cavity filling intact, again vacuum deaeration. The purpose of defoaming is to extract the gas during the pouring process and the gas enclosed in the prototype cavity. The time of defoaming should be longer than the defrosting time before pouring. The specific time should be based on the silica gel The material’s operating time and the size of the Shouban prototype. After defoaming, the silicone mold can be self-hardening or heating hardening. Heating and hardening can shorten the hardening time.

Remove the box, knife open mold and remove the Shouban prototype

When the silicone mold hardening, you can remove the type frame and remove the sprue and so on. With the reference to the prototype part of the mark to open the mold, the Shouban prototype removed, and the silicone mold cavity necessary cleaning, you can use the production of silica gel mold in a vacuum state of resin or plastic products manufacturing.