1. The function of screw
A lead screw is a mechanical element that converts rotational motion into linear motion. It consists of threaded belts, guide rails, guide nuts and other components. The function of the screw is to use the mutual cooperation of the guide rail and the guide nut to realize the conversion of rotary motion and linear motion. In addition to converting rotary motion into linear motion, the screw can also convert linear motion into rotary motion.
2. Application fields of screw

   Machine tool industry：
In machine tools, lead screws are used to control the movement of workpieces on the machine tool. The machine tool industry has high requirements for the accuracy, quality and service life of the screw, because the performance of the screw is directly related to the accuracy of the machine tool.
   Aerospace field：
In aerospace, screws are mainly used to drive steering gear and adjust the height and direction of the aircraft.
    Automobile industry：
In the automotive industry, screws are mainly used in suspension systems, braking systems and regulating valves. The use of screws can improve the accuracy and reliability of automobile parts and components, and further improve the performance and quality of the entire automobile.
   Other fields：
In addition to the above fields, screws are also widely used in other fields, such as shipbuilding industry, instrumentation, medical equipment and other fields. These applications all reflect the characteristics of high precision, high sensitivity and high reliability of the screw.

In short, the screw is a very important mechanical component and it is widely used in various fields. The function of the screw is to convert rotary motion into linear motion, or linear motion into rotary motion. At the same time, the quality, accuracy and service life of the screw have very high requirements for specific application fields.