1. Alloy (alloy)
Die casting companies can purchase zinc alloys that are ready for melting and casting. Alternatively, you can buy pure zinc (special high-precision zinc in accordance with ASTM B6) rods, zinc ingots or zinc ingots and make zinc alloys. According to ASTM B327-98, the alloy components aluminum, copper and magnesium can be used alone or as standard alloys. Standard alloys are provided in the form of small balls, rods, ingots or large ingots. Generally, die casting operations must derive a lot of economic benefits from the manufacture of alloys. Other methods include the use of truncated EC (conductive) aluminum wire and pure magnesium.
If die-casting companies produce their own alloys, they must have equipment and train appropriate personnel. The equipment includes a separate furnace for melting zinc and mixed alloy components. Usually, pure zinc is melted first, and then standard alloys are added. Alloying elements can also be added, mainly magnesium. Use a long-handled, inverted and porous conical tool to dip the solid magnesium into the zinc furnace. The tool requires stirring, and the magnesium must be immersed under the surface of the molten metal until it melts.
Note: Any tool used to melt metal must be coated with a ceramic layer to ensure that the molten zinc does not touch the iron tool. If iron comes into contact with molten zinc, the iron will dissolve into the molten zinc bath.
The molten metal in the melting furnace must be placed in the melting furnace long enough to completely melt the metal and form an alloy. The molten metal must remain in the furnace to help transfer heat to the solid alloy ingot during the feeding process. This unused liquid metal should account for about 30% of the entire furnace. The alloy steps are:
Add pure zinc to the molten metal in the furnace and melt it.
Add standard alloys or alloying elements to the furnace to melt them.
Slowly stir in the melting tank to mix the mixture.
Let the melting tank stand for 15 minutes.
If necessary, degrease surface scum.
Check the alloy composition to make it meet the specifications.
For more information about manufacturing zinc alloys, please consult your metal supplier. It is always useful to obtain the appropriate ASTM specifications.
The alloy must be tested to ensure that it meets specifications. When testing the alloy, a part of the alloy is sc-out from the furnace and poured into a mold to make a sample. ASTM Standard E-634-78 "Sampling Standard Specification for Light Irradiation Spectroscopy Analysis of Zinc and Zinc Alloys, Mold Types and Actual Procedures for Manufacturing Samples"