Preparation process of multifunctional SMD (Surface Mount Device) active piezoelectric buzzer

The invention belongs to a sound production component in the electroacoustic field, and particularly relates to a multifunctional SMD active piezoelectric buzzer preparation technology which comprises a shell upper cover, a high-temperature-resistant buzzing piece, a miniature packaged special piezoelectric buzzer driving integrated circuit, two miniature pagoda springs, a metal lead frame and a shell base. The high-temperature-resistant buzzer is characterized in that the high-temperature-resistant buzzer is installed at a step of the shell upper cover and is sealed and fixed through silica gel, a sounding hole is formed in the shell upper cover, a sounding cavity is formed between the high-temperature-resistant buzzer and the shell upper cover, and the metal lead frame and the shell base are integrally formed through die pressing. The metal lead frame and the top of the shell base form a plane, a connecting rib of the metal lead frame extends to the outside of the shell base and is bent downwards to form a