Shenzhen prototype factory detailed the whole process of silicone mold production

detailed explanation of Shenzhen prototype factory the whole process of making silicone molds

prototype model prototype surface treatment

the prototype made by RP rapid prototyping method generally has step lines or gaps between its laminated sections, polishing and anti-seepage and strengthening treatment are required to improve the surface smoothness and moisture resistance and heat resistance of the prototype. Only the surface of the prototype is smooth enough to ensure the surface roughness of the silicone mold made, which in turn ensures that the converted product has a high surface quality and is easy to remove from the silicone mold.

make frame and fixed prototype

design the shape and size of the pouring frame according to the geometric size of the prototype and the silicone mold use requirements, the size of the frame should be moderate. Before fixing the prototype, it is necessary to determine the location of the parting surface and the gate. The location of the parting surface and the gate must be very important, it directly affects whether the pouring prototype model can be demoulded smoothly and the pouring quality of the prototype model is good or bad. When the parting surface and gate are selected and processed, the prototype is fixed in the type box.

silicone metering, mixing and vacuum defoaming

The amount of silica gel should be accurately measured according to the size of the frame made and the density of silica gel. Add the measured silica gel to the appropriate proportion of the hardening agent, stir evenly and then vacuum defoaming. The defoaming time should be mastered according to the vacuum degree reached.

silicone pouring and curing

silicone mixture is poured into the fixed prototype box after vacuum defoaming. In the pouring process, some skills should be mastered. After pouring the silicone, in order to ensure that the cavity is filled well, vacuum defoaming is carried out again. The purpose of defoaming is to extract the gas incorporated into the silica gel during the pouring process and the gas enclosed in the prototype cavity. The defoaming time should be appropriately longer than the defoaming time before pouring, the specific time should be based on the operational time of the selected silicone material and the size of the prototype. After defoaming, the silicone mold can be hardened by itself or heated. Heating hardening can shorten the hardening time.

removing the frame, cutting the mold and removing the prototype

when the silicone mold is hardened, you can remove the frame and remove the gate rod. Refer to the mark of the prototype parting surface to split the mold, remove the prototype, and clean the cavity of the silicone mold as necessary, the silicone mold can be used to make resin or plastic products in vacuum.

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