Create the original prototype first using CNC machining or 3D printing. It is essential to ensure that the prototype is accurate, clean, and free of oils or contaminants.

Hang the master model in the casting box using plastic rods as gates and vents，pour liquid silicone around the prototype, ensuring no bubbles are trapped. Create a vacuum environment to remove any potential air pockets. Place the filled mold in an oven and cure it for 8 to 16 hours (depending on the mold's volume) at a temperature of 40°C. Once the silicone mold is fully cured, cut open the casting box, remove the prototype from the silicone, and the silicone mold is ready for use.

Select the appropriate casting material according to the requirements (such as polyurethane resin). Inject the liquid material into the silicone mold under a vacuum environment to ensure uniform filling and minimize air bubbles. Place the silicone mold into a constant-temperature oven, preheat it to 60-70°C, and cure for 30-60 minutes.

After curing, open the silicone mold and remove the prototype. Then proceed with post-processing operations, such as deburring, painting, or others. Repeat this process to obtain more parts.