◆◆ Product Information
◪ The vacuum casting technology uses a prototype of the product (rapid prototype, CNC prototype) to make a silicone mold under a vacuum, and uses a PU material to be poured under vacuum, thereby cloning the same replica as the prototype.
◪ The vacuum casting technology can be applied to change the material of the prototype, assemble the prototype or carry out small batch production of the product to meet the requirements of performance testing, marketing, inspection and approval in the product development process.
◆◆ Detailed
Two pieces of silicone mold are turned over with a single piece of the finish product.
Combine the two pieces of silica gel mold prepared in advance and place them in the environment of 65°-70°. The two pieces of silicone mold joints will melt until they are seamlessly connected.
The air in the silicone mold is evacuated, and the drain tube is poured into the liquid PUR until it fills the cavity. Cooling (45 minutes - 4 hours)
Cut two pieces of silicone mold, remove the finished product, wait for trimming and sanding
◆◆ Steps
◎ The cost is low and the production cycle of the product is relatively short.
Less waste and processing costs are much lower than CNC machining and 3D printing.
Then mix silicone with a curing agent. The appearance of Vacuum Casting is a flowing liquid, component A is Silicone, component B is a curing agent.
◎ Vacuum evacuations
After the silicone and curing agent are mixed evenly, vacuum evacuation is performed. The time for vacuuming should not be too long. Under normal circumstances, do not exceed 10 minutes. If the vacuum is too long, the silicone will cure immediately. The cross-linking reaction was produced so that the silica gel became one piece and could not be painted or poured.
◎ Brushing or operation process
Pull the evacuated silicone on the sample by brush or pour. (Note: The product or model to be copied need to use release agent before pouring the silicone). Then brush the silicone on the top of the product, brushing must be uniform, after 30 minutes, paste a layer of gauze fiber weft cloth to increase the strength and tensile of silicone.
◎ Outer mold production
Generally used methods and materials are surrounding the mold by a plastic sheet or wood, then fill mold cabinet with plaster. Another method is to brush a layer of resin then paste a layer of the glass fiber cloth, then brush and then paste, repeated two or three layers can complete the mold outside.
◎ Filling or pouring mold operation method
Filling or pouring mold is used for relatively smooth or simple products, no mold line saves time and labor.
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