Vacuum Casting Stage: 2

Stage 2: Pattern Post-Processing stage

Following data preparation stage and after the master model is 3D printed or machined, the post-processing process starts. Post-processing of the master model is an essential stage in vacuum casting process. The purpose of this stage is to create identical parts to the master model for which some detailing is required. Furthermore, the master model must be flawless in order to make sure that there are no flaws in the duplicated parts. To this end, the master model needs to be post-processed according to what the client is expecting it to look like. The surface quality of the master model will be duplicated identically in the shots that are going to be acquired from the silicone mould. At this point, there are some specifications which depend on what the client demands. For instance, if the model needs to be glossy then it is polished. If a matte finish is desired then it is sandblasted. As PLG Engineering, we use our expertise to handle the post-processing phase with the use of lots of tools. When the surfaces are ready, the next step starts which is positioning the part in the frame. Our mould designer chooses an orientation and places the master model in this frame accordingly. At this point, there are some specific features that need to be taken into consideration. Among these features are the density, viscosity, characteristics and flow direction of the resin. Before silicone casting starts, it needs to have some runners and sprues which should be determined. The last stage is wrapping the master model with robust metal plates and pouring the liquid silicone into it. It is essential for the silicone to wait for 12 to 24 hours to get cured. When the curing is finished, the silicone demoulding process begins.

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