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The following article was published in our article directory on February 16, 2012.
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Technical Issues Regarding Die Castings and Its Uses

Article Category: Business

Author Name: Castings Aluminum

Part Diecastings are like permanent mold casting, with the exception of the metal under high pressure (10-210 MPA) injected directly into the mold. The result would be a more uniform part, clean surface finishes complete with excellent dimensional accuracy, as better as 0.2% in precise diecasting dimensions. For the other diecasting parts, manufacturers wouldn't have to worry about post-machining anymore, since the whole procedure can now do without it.

The diecasting production process is accomplished using either the cold or hot chamber diecasting process. The cold chamber casting process is characterized by directly spoon feeding melted alloy into the tool for each shot. Here, there is considerably less exposure time of the melt making contact with the plunger walls, which comes in handy for important metals (aluminum, copper and all of their diecasting alloys) that would alloy with iron easily in high temperatures.

A hot chamber casting process on the other hand requires the pressure chamber to be connected directly to the tool cavity. This should make for a permanent immersion of the molten material used in the process. The pressurizing cylinder's inlet port would be uncovered for the plunger to move into open space freely. This development allows new molten die casting alloy charge to fill up the die cavity much faster than that of the cold chamber die casting process. This method is mainly used for those die casting metals with low melting points and higher fluidity characteristics (zinc, tin, and lead).

Diecasting tools are costly since they are made entirely from hardened steel, with the exemption of harder and stronger metals that cannot be diecast (steel, iron). Another factor would be the relatively long cycle periods needed in building these casting tool types.

Common metals used in the die casting process include aluminum, copper alloys and zinc. Pure aluminum on the other hand is used rarely because of its high shrinkage characteristic and vulnerability to hot cracking. It is alloyed instead with silicone, making for increased melt fluidity, significantly reducing its machine ability. Copper is another important element that increases hardness when alloyed. It has the ability to reduce ductility and corrosion resistance. Copper alloys are important components in plumbing and electrical applications where wear and corrosion resistance plays a fundamental role in the process.

Casting processes using magnesium are limited at 20 kg max, and up to 35 kg max for zinc. Large die casting operations normally suffer from greater porosity problems, most probably due to entrapped air that initiates the solidifying of the melt even before it gets a chance to extend to the edges of the diecasting die cavity. Manufacturers get side step this through vacuum part die casting.

Beginning at a design efficiency angle, it would be smart to design casting parts with uniformed thickness on the walls and its cores of uncomplicated shapes. The heavy sections of die castings pose some serious cooling problems, with trapped gasses wreaking havoc with the die casting part and causing porosity. Producers at www.castings-aluminum.com must see to it that all corners be radii with plenty of room just to avoid stress concentration.

Keywords: aluminum, castings, die castings, aluminum parts, automotive, lighting, hardware,

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