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At its core, a solenoid is an electromechanical device that converts electrical energy into linear motion. It typically consists of a coil of wire wound around a cylindrical metal core. When an electric current passes through the coil, a magnetic field is generated, causing the metal core, or plunger, to move. This movement can be harnessed to perform various functions, such as opening valves, locking mechanisms, or even activating switches.

The die casting process begins with the preparation of the die, a mold made from steel or other robust materials that can withstand high pressures and temperatures. The choice of metal is crucial, with aluminum, zinc, magnesium, and copper being the most commonly used alloys due to their favorable properties such as strength, light weight, and corrosion resistance.