Zinc Die Casting Manufacturing Technique and Related Attributes. Aluminum die cast manufacturing is one of the many known metal casting processes being utilized in the metalworking industry today. Other than zinc, other alloys use other materials as well, which includes the following – lead and magnesium. Each of these casting metals has its own unique attributes that make them pretty useful.
For instance, among these said metals, magnesium is the one that is easiest to machine and it has a pretty good ratio between its weight and strength. On the other hand zinc is very easy to cast. It also has high impact strength and is really cost saving when manufacturing small parts.
Zinc Die Casting Metal Working Technique and Related Attributes
The technique of metal die casting involves injecting liquefied molten metal into steel molds that are otherwise known as die cast tooling. Certain characteristics of aluminum alloy make it well suited for certain uses. First off, this metal alloy is corrosion resistant unlike iron that is prone to rust and quick decay. The materials that are created using aluminum metal tend to be lightweight and easier to transport.
There are other characteristics of aluminum alloys that make them very useful. Its high dimensional stability works very well for manufacturing thin walls and very complex figures. It also has great mechanical properties and it can remain very sturdy in spite of high temperatures. This metal alloy is also a good conductor of electricity and heat.
Accepted as the traditional method of aluminum die casting manufacturing is also called high pressure diecast manufacturing. This method of diecast manufacturing has four consecutive steps – die preparation, filling, ejection, and finally shakeout. The preparation stage incorporates spraying lubricant into the cavity of the die, which helps make it easier to remove the aluminum metal. Lubrication also helps in temperature control.
After the die is lubricated and prepared, molten aluminum alloy is injected into the enclosure using very high pressure, which is where the name of this method was taken. The pressure in the die usually ranges from 1,500 psi to 25,400 psi, which is maintained until the metal alloy solidifies.
Once the alloy inside have solidified then the dies are opened and the shot is ejected. The final step in the traditional method of aluminum die cast manufacturing is called the shakeout, simply because the scraps are removed or shaken off the casting. Manufacturers utilize a trimming die that is mounted on a power or a hydraulic press in the final step in the entire process.
Better or Worse – Therefore a huge amount of pressure is used to fill the die, the cavity that needs to be filled by the cast is easily filled before any part or portion of the molten metal solidifies. This basically solves the initial problem of discontinuity in the casting. The drawback to this method is that air gets entrapped pretty easily thus producing small pockets or pores.
Regarding the amount of porosity in the center of the cast alloy part, vents are incorporated into the die. These vents are usually placed along the parting lines. Other finishing processes such as plating, hole-tapping, and buffing are utilized in order to obtain the best output in Aluminum die casting manufacturing.
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