Protocast Inc. offers rapid prototype to production castings for a range of industries. Specializing in non-ferrous alloys, we are a Denver Machine shop that is experienced in aluminum, zinc, and magnesium cast and CNC-machined parts for automotive, defense, aerospace, robotics, medical, and oil and…Read More
Rubber Plaster Mold Casting
USING A VARIETY OF TECHNIQUES (HARD TOOLING, WAX PATTERNS, SLA’S, OR CUSTOMER SUPPLIED PATTERNS) WE CREATE A SILICONE MASTER TOOL FOR THE PART. THE SILICONE TOOLING CAN THEN BE USED TO MAKE ANY NUMBER OF PLASTER MOLDS.
The durability of the silicone tooling will depend on a variety of factors but, in many cases, can be used to make hundreds of parts without degradation. After the plaster mold is heated and cured, metal is poured into the mold while it’s still hot. This allows is to fill thin walls and intricate geometry far more effectively than can be achieved in a sand mold. RPM casting is a natural fit for electronic enclosures that heat integrated heat sink fins, as well as lightweight and complex parts cast from aluminum and magnesium.
Advantages: Near Die cast surface finish; Zero to 1 degree of draft possible; Supports designs with thin walled features such as heat sinks and electronics enclosures
Ideal for running 5-250 parts. Requirements are .080” minimum wall thickness and radii in pull direction. This process is most often used for complicated geometries and thin wall sections. Also best process for replication to die cast parts.
Can run hundreds of parts off of 1 tool, but easy to pour a new silicone from the tool and costs are about ¼ of original tooling if doing multiple hundreds, but here too, at certain point in hundreds, no cost benefit to keep going if demand is still ongoing.