The Different Types of Casting Processes Used to Manufacture a Variety Materials

Cast moulding technology is used where liquefied material is poured into the cavity of a specifically designed mold and allowed to harden. After solidification, the work piece is separated from the mould to go through various finishing treatments so that it can be used as a final product.

Casting manufacturing is typically used to create intricate solid and hollow shapes, and thus can be used to obtain products including automotive components, aerospace parts and cast moulding contact lenses.

Cast Moulding Process

Undoubtedly, casting is one of the oldest yet finest techniques used rigorously in a wide range of applications and products involving manufacturing contact lenses. And along with the modern advancement in casting technology- there’s an upsurge in the development of a broad array of specialized casting methods. Hot forming processes like die-casting, investment casting, plaster casting, and sand casting each method offers unique manufacturing benefits to cast products effectively.

Getting to know about a variety of casting processes can help in choosing the method best suited for a given production type.

The Common Types of Casting Processes

Sand Casting: It usually depends upon silica-based materials including synthetic or naturally-bonded sand. Sand casting typically consists of finely ground, spherical grains that are tightly packed together into a smooth moulding surface. This type of casting prevents tearing, cracking, or other flaws by allowing a moderate degree of flexibility and shrinkage during the cooling phase of the process.

Investment Casting: Investment or low-wax casting uses a disposable wax pattern for each cast part. The wax is injected into a mold, removed, and then coated with refractory material and a binding agent used to build up a thick shell.

Plaster Casting: Plaster is casting is similar to the sand casting process which uses a mixture of gypsum, strengthening compound, and water. This plastic pattern is coated with an anti-adhesive compound to prevent it from sticking.

Die Casting: Die casting is used to mold materials under high pressure and usually involves non-ferrous alloys and metals. It is bound to deliver high component dimensional consistency which is bound to deliver uniform design.

Permanent Mold Casting: Permanent mold casting is similar to die casting and centrifugal casting. These molds can be made using steel, graphite, lead, zinc or aluminium. As the molds rotate through a variety of stations- they get successively coated, closed, filled or opened.

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