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Qingdao Antai Import and Export Co.,Ltd

Different Casting Process

Sand Casting

Sand Casting is the most common metal casting process. In this process molds are made of sand and mixed with a bonding agent such as clay, then compacted around the three-dimensional pattern.

This approach is suited to all kinds of ferrous and nonferrous alloys, as light as 100 grams (0.2 lbs) with little or no weight limitations.

 

Die Casting 

Die Casting is a process whereby liquid metal is forced into the cavity of a mold. The negative-form mold (the die) is made of alloy steel (usually Chromium steel), chosen for its ability to withstand the molten metal’s heat.

Logical Option for:

 

  • Minimums of 500 up to 100,000 units

  • Small to medium size pieces

  • Variety of non-ferrous metals

  • The most commonly used alloy is A 380 due to its optimal combination of material properties and production workability. Especially suitable for uses in the following sectors:

  • Electronic & communication devices

  • Automotive parts

  • Structural components

  • Furniture parts

  • Alternative aluminum alloys and other metals are available.

  • Unit Cost efficient method based on larger quantity production runs.

  • Good surface finish

  • Provides dimensional consistency

High-pressure die casting:

  • Suitable for series runs of 100,000 or greater annual units

  • Good surface finish (N8 or better)

  • Tight dimensional tolerances

  • Provides lower unit costs by offering a significant economy of scale

Gravity or low-pressure die casting:

Each of the above methods has its own specific advantages particularly with regard to low-porosity potential, small grain size, and minimal waste.

  • Suitable for small to medium size parts

  • Most cost effective for runs of 500 units or greater

Gravity: Produces the highest quality structure with decreased grain size.

 

Low-pressure: Provides the better surface finish and approaches high-pressure’s very thin wall-thickness capabilities.

Shell Molding 

Shell Molding is a high-grade version of sand casting, producing the highest quality of casting available with modern technology. In contrast to sand casting, in shell molding the sand is heated, so that when the resin sand touches the pattern, it creates a thin “shell” around it. This shell becomes the negative pattern forming two pieces. These two pieces are then mated to create a mold, into which molten metal is poured. The cast part is then retrieved by breaking the shell away from it.

 

  • Suitable for medium to large series runs or as few as 1,000 units.

  • Offers high dimension accuracy and stability (comparative to water glass investment casting).

  • High quality surface finish.

  • High production efficiency.

  • Competitive unit pricing.

Investment Casting

The investment casting process begins with a precise model (pattern) of the end product. For centuries this pattern has been made out of wax, however currently there are a variety of materials that are used. The model is then covered with a ceramic slurry which hardens to create a mold. The original model is then dissolved (for example, wax is melted and drained), and molten metal is inserted in its place. Once cooled and the mold removed (divested), you are left with the finished piece.


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