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What is Vacuum Casting/Silicon Molding?

Vacuum casting dedicated to the exquisite production process model and low-volume manufacturing , widely used in plastic products proofing preview. Vacuum casting commonly used plastic materials are ABS,PC,PMMA,PP and PA, color and intensity with highly flexibility of silicone molding parts, very suitable for product designers to customized rapid prototype.

If you want to make product in small quantity to save high molding cost, you may do Vacuum Casting. This is special process by silicone molding.Starting from a model obtained through CNC machining or SLA 3D Printing master, we could duplicate a small series of parts in polyurethanes or other polymers by vacuum casting in silicon moulds.

Vacuum Casting (Silicon Molding) is ideal choice for low volume manufacturing of plastic (ABS,PC,PMMA,PP,PA+GF etc)and rubber parts.Using silicon mould instead of steel mould.It has greatly reduced the cost of product development. Regularly one silicone mold can be duplicated about 15 to 25 pieces of parts, depending on complexity, painting or original color, size and such other factors as material considerations. It is especially suitable for low volume production of 10 - 200 pieces of small batch of plastic products.

Nowadays,the production process of mould churn out millions of products each year.But what if you only need to produce 1,000, 100, or even 10 per year? Low-volume manufacturing is fairly common in the medical device industry, for instance, as new concepts are tested in pilot markets or in clinical trials before larger volumes are necessary. Vacuum casting is one of most economical method to produce the products.Vacuum casting is a widely used technology capable of producing polyurethane (PU) resins and molded nylon parts for copying and replacing engineering polymers for prototyping and low-volume production.

There are some design recommendation for Vacuum casting:

1.The size of the product should be taken into account in the design process (it is recommended that the weight of a single piece of parts be within 2.5 kg, When using vacuum casting to make a product. The larger the volume of the product, the larger the proportion of cooling shrinkage and the longer the time taken.

2.Avoid sharp product modeling as much as possible.Some sharps are actually too thin for silicon molding draft.

Features of Vacuum Casting :

1.The use of digital display automatic control technology, It has automatic control system for easy operation.

2.The use of vacuum technology bilevel positive, gas performance is stable and hard-wearing .exchangeable operations it can a machine with multi - use.

3. the worktable uses the frame type steel frame structure, the effective enhancement vacuum degree, durable. exchange table, can carry out a box of many pieces of veneer, to achieve a more than one machine.

4. Unique far infrared constant temperature heating system.It’s save energy and time & power safe as shifting to use. Heating evenly, thus reducing product deformation, wrinkling, degumming and other phenomena.

5. The key components of the electronic control system with high temperature and high insulation material configuration with safe and reliable operation

Advantage Of Vacuum Casting

1)Faster delivery time than CNC milling(What's the difference between CNC Machining and 3D Printing?) of small consumer products,prototype can be ready in a few days once the plastic master model has been created.

2) Good for testing complex structural rapid products.

3)Color can be customized by casting to meet your color requirements.For instance,rubber,ABS material.

4) Low cost for low volume production before injection molding of mass production.

5)More reasonable price compared with CNC machining and 3D printing for some parts.

6)We provide overmolding service, so that different types of plastic can be molded together into a single unit.

This is special process by silicone molding.Here are the manufacturing process details:

1.We need to create a master before making silicone molds, then, use the master to duplicate the product with limited quantity. The master can be used more common ABS materials made by CNC machining or 3D printing.

2.Put the master into the container, and inject the silicone liquid.

3.Curing. After 30-60 minutes of curing at a thermostat at 60-70 degrees, it can be removed. If necessary, two times for 2-3 hours in a thermostat at 70-80 degrees.Heat the container into the machine and the temperature reached certain value.Let cool completely,then the formation of silicone mold.

4.Removed the curing silicone mold .

5.Cutting silicone mold and separated two pieces.

6.Remove the prototype from the silicone mold.

7.Exhaust air then seal and the curing agent and liquid gum material into silicone mold.

8.Heat the container into the machine and the temperature reached certain value.Let cool completely,then the formation of cast prototype silicone mold.

9.Cutting silicone mold and separated two pieces.

10.Remove the cast prototype from the silicone mold.

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