Do you know the way to do low temperature metal casting

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Do you know the way to do low temperature metal casting

Post  megan2008 on Mon Nov 11, 2013 3:49 am

In the lost foam casting manufacturers,lost foam casting (LFC) is an economical type of metal casting in the long run.Unlike other methods, it does not require very expensive equipment.The only drawback is that for metals that can be poured at low temperature,the size of the piece is limited. But it can be used for just about any type of metal,ferrous or nonferrous.Spin casting is another method of low-temperature metal casting.It is good for pewter and zinc alloys.

Evaporative Pattern or Lost Foam Casting

Make a polystyrene foam pattern of the part to be cast. Polystyrene foam is the same material that foam coffee cups are made of.It can be carved or molded.A gate,which is the opening the metal will be poured through,and feeders, which are reservoirs of extra molten metal that will enter the mold to replace any of the metal that is lost because of shrinkage, must also be added.Dip the pattern into a semi-liquid ceramic mix.The mix can also be poured over or sprayed on the form.

Let the mixture dry.This will form a shell around the pattern. Support the mold on a bed of unbonded casting sand on a vibration table.A vibration table ensures that the mold will compact evenly.

Pour in the molten metal,which will make the form compact. The metal will replace the form and make a copy of the form down to the smallest details.

Finish the piece by cutting off,grinding,heat-treating (which involves heating and cooling until it is satisfactory), straightening and then blasting.

Spin Casting

Make a mold out of uncured silicone rubber by placing the pieces to be cast on top and cutting the shape into the silicone.Cut the mold in half horizontally to form two halves. The mold must be sprayed with mold parting compound and joined together with acorn nuts.

Make sure the rubber is vulcanized so it will have the necessary strength to survive the process. It sets the shape of the mold, cures the silicone and forces it into all the crevices of the pieces.Grate and vent the mold to prevent the buildup of gases.

Put the mold into the machine.Start the machine and pour in the molten metal, and it will be forced into the mold by centrifugal force.Remove the parts from the mold by breaking the gates,runners and vents by hand. The pieces will come out clean and be ready to finish.

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megan2008

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