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A typical magnesium alloy smelting system consists of several key components designed to ensure safe and efficient melting. The process begins with a preheating furnace that raises the temperature of the magnesium ingot to over 1500°C, preparing it for the melting stage. An ingot feeding device is then used to transfer the preheated material into the melting furnace. The melting system itself typically includes a molten metal bath, often made from medium carbon steel or heat-resistant stainless steel, to withstand high temperatures.
The furnace is equipped with a lid to maintain thermal efficiency and prevent contamination. It also features essential systems such as temperature sensors, level control mechanisms, and a shielding gas system to protect the molten metal from oxidation. Additionally, there are inspection and cleaning ports for maintenance purposes, as shown in Figure 12-1.
If the process involves pressure casting, the molten metal must be transferred to a die casting machine. This can be done using various methods, including manual ladling, siphoning, air pumps, piston pumps, or even electromagnetic pumps, depending on the scale and requirements of the operation. Each method has its own advantages and is selected based on factors like precision, speed, and safety.