For plastic, as most plastic materials can be injected, in the molding process the plastic chips are molten down, fed into the molding machine and injected into a steel mold.
Zamak ingots are molten down into a melting pot within the molding machine. The molten material is then pressed into a steel mold where it goes back to solid state in the shape of the final products.
By using specific milling machines, some materials can be mechanically shaped: among them are brass, steel, aluminum as well as some other metallic materials.
Metal Injection Molding is a complex molding process suitable for stainless steel. It consists of three phases:
- Molding – similar to plastic molding, raw steel and plastic chips are molten down into a mold to get the so-called “green”.
- Water debinding – the “green” parts are treated to partially eliminate the plastic content and get the so-called “brown”. Within MTWH Group, no chemicals are used in this phase.
- Sintering – this is the final stage where, to get the final steel product, the “brown” part needs to be cured in a high-pressure atmosphere at a temperature of over 1000°C.
A brass billet is heated up until it gets to its softening point, it is then smashed into a steel mold by a forging machine. The process is completed by cutting the exceeding burs.
This is the most suitable technique for producing particular shapes of brass or aluminum items, especially round ones.
Conceived as a jewelry-dedicated technology, when it comes to brass it is actually the go-to technique for complicated shapes that cannot be obtained through standard molding. It is also suitable as a prototypal technique.