Zinc alloy die-casting mold develops excellent thermal conductivity
The development of zinc alloy die-casting molds has different names in different places, such as aluminum die-casting parts, die-casting aluminum parts, die-casting aluminum parts, die-casting aluminum, aluminum die-casting parts, and aluminum alloy die-casting parts. Since aluminum metal and aluminum alloy have good fluidity and plasticity, and the casting process is cast in a pressure die casting machine, the aluminum alloy die casting can make various complicated shapes and can also make higher precision. And the smoothness, thus greatly reducing the machining amount of the casting and the casting allowance of the metal aluminum or aluminum alloy, not only saving electricity, metal materials, but also greatly saving labor costs; and aluminum and aluminum alloy have excellent heat conduction Sex, small specific gravity and high processability.
Most of the former machine tool castings are gray cast iron. For the quality of gray iron castings, strict control of environmental zinc alloy die-casting mold development from chemical composition, raw material quality, batching, alloying, melting temperature, inoculation treatment and heat aging is required.
1. Melting session
1) Carbon equivalent. Higher carbon equivalents should be used, HT250 should be 3.95; HT300 should be 3.82; HT350 should be 3.76.
2) Silicon to carbon ratio. It is recommended to control the silicon to carbon ratio between 0.55 and 0.62.
3) Alloying control. The addition of alloying elements is beneficial to the improvement of casting properties, generally w (Cu) 0.4-0.6% or w (Cr) 0.2-0.4%.
2, ingredients
The amount of pig iron added is less than 10%. At the same time, high scrap steel and high carburizing process are adopted, so that the graphite quality is good.
3, the temperature of the molten iron
The high molten iron temperature refines graphite and is the basis for high carbon equivalent, high strength grey cast iron. When the temperature of the molten iron is 1500-1550 ° C, the oxidation of the molten iron is reduced, and the SiO 2 ash is remarkably lowered.
