The metal materials such as stainless steel, copper and aluminum are processed by
Die casting, Stamping and Cold forging to form a preform of the lamp body casing.
Die casting is a metal casting process characterized by the use of a mold cavity to apply high pressure to the molten metal. Molds are usually machined from higher strength alloys, some of which are similar to injection molding.
Stamping is a method of forming a workpiece (stamping part) of a desired shape and size by applying an external force to a plate, a strip, a pipe, a profile, and the like by a press and a die to cause plastic deformation or separation.
Cold forging is a forming process below the recrystallization temperature of the material, and is forging at a temperature below the recovery temperature. Cold forging materials are mostly aluminum and some alloys, copper and some alloys, low carbon steel, medium carbon steel and low alloy structural steel with less deformation resistance and good plasticity at room temperature.