Green sand castings and resin sand castings


When casting in green sand metal from the blast furnace is poured into moulds to make the casting (the piece to be manufactured).


The model is used to create the hollow cavity of the refractory material that will be used for casting the metal. The shape is made by inserting the mould and compacting the foundry sand into the boxes, known as flasks


For each object that has to be manufactured two halves of the mould must be created. After compaction, the pattern is extracted and the mould is finished off during the core assembly phase.


Following this, the filled moulds are cooled down and transported to the shake-out area where they are placed on vibrating grids that open the flasks.


The casting in resin sand differs from that in green sand by the components used and by the mixing time of the latter, which occurs before the mould is created.


This technique uses urea-phenolic or furan resins which when in contact with a chemical catalyst makes the sand harden and retain the shape created by the mould.

Manual casting

Manual sand casting


Manual sand casting allows castings of all sizes and even individual pieces to be manufactured.


This method comprises the following steps:

  • To mould the first half, place the iron flask above the pattern;
  • Using the hopper, fill it with sand;


  • Use the pressing bracket of the hoist positioned on the ground;
  • The mould for the other half is created in the same way.
  • With the hoist or overhead crane the two halves are joined manually.

 

Permanent mould casting machines

Permanent mould castings

Permanent mould castings guarantee pieces with absolute precision because they are made from steel or cast iron moulds.

Friber has 4 gravity die casting machines which are able to create small castings or castings weighing several kilos.

The largest gravity die casting machine has a maximum die opening of 1200 mm.

 

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