1. Engine System: Machined parts like pistons and crankshafts precisely cooperate to achieve energy conversion, ensuring the efficient and stable operation of the engine, which directly affects the vehicle's power performance.
2. Transmission System: Precision - machined parts such as gears and drive shafts guarantee the accuracy and smoothness of power transmission, being crucial to the vehicle's handling experience and driving safety.

II. Aerospace Field

1. Aircraft Structure: Large machined parts like aircraft beams and wing skeletons have high strength and precision. They support the aircraft's structure, withstand various loads during flight, and ensure flight safety.
2. Aero - engine: Key parts such as blades and turbine discs require extremely high machining accuracy to adapt to high - temperature, high - pressure, and high - speed environments, being the core guarantee of the engine's performance.

III. Electronic Equipment Field

1. Heat Dissipation Components: The radiators of computers, mobile phones, etc., are mostly machined aluminum alloy parts. They use their good thermal conductivity to efficiently dissipate the heat generated during equipment operation, maintaining stable operation of the equipment.
2. Internal Structural Parts: Precision - machined metal frames and connection parts provide stable support and reliable connection for electronic components, ensuring a reasonable internal layout and stable operation of the equipment.

IV. Industrial Equipment Field

1. Machine Tools: Machined parts such as lead screws and guide rails determine the accuracy and stability of machine tools, affecting the processing quality of workpieces and serving as the basic guarantee for the manufacturing industry.
2. Automated Production Lines: Various transmission and positioning parts ensure the precise operation of each link in the production line, enabling efficient automated production.