What are the commonly used fixtures for CNC lathes?

　1. Three-claw chuck: The three-claw chuck is the most commonly used universal lathe clamp. The biggest advantage of the three-claw chuck is that it can automatically center, has a large clamping range, and has fast clamping speed. However, there are errors in the centering accuracy and it is not suitable for secondary clamping of workpieces with high coaxiality requirements.

　　2. Hydraulic power chuck: It has sensitive action, fast and convenient clamping, can achieve large pressing force, can improve productivity and reduce labor intensity. However, the clamping range changes slightly, and the claw position needs to be readjusted when the size changes greatly. CNC lathes with a high degree of automation often use hydraulic self-centering chucks, which are especially suitable for batch processing.

　　3. Adjustable jaw chuck: It takes more time to clamp and align parts than other types of chucks. Therefore, this chuck is rarely used on CNC lathes, which are crucial to improving productivity. Adjustable jaw four-jaw chuck is generally used to position and clamp parts with non-concentric or structurally symmetrical surfaces. When using four-jaw chucks, faceplates, angle irons (bent plates), etc. to clamp irregularly heavy workpieces, a counterweight must be added.

　　4. High-speed power chuck: In order to improve the production efficiency of CNC lathes, higher and higher requirements are placed on their spindles to achieve high-speed and even ultra-high-speed cutting. Some CNC lathes now even reach 100,000r/min. For such high rotational speeds, ordinary chucks are no longer suitable, and high-speed power chucks must be used to ensure safe and reliable processing.

　　Preliminary preparation

　　To determine the process requirements of typical parts, the batch size of processed workpieces, and to formulate the functions that the CNC lathe should have is to make preliminary preparations. The prerequisite for rational selection of CNC lathes is to meet the process requirements of typical parts.

　　The process requirements of typical parts are mainly the structural dimensions, processing range and accuracy requirements of the parts. The control accuracy of the CNC lathe is selected according to the accuracy requirements, that is, the dimensional accuracy, positioning accuracy and surface roughness of the workpiece. Choose based on reliability, which is the guarantee for improving product quality and production efficiency.

　　The reliability of CNC machine tools means that when the machine tool performs its functions under specified conditions, it can run stably for a long time without failure. That is to say, the mean time between failures is long. Even if a failure occurs, it can be restored and put back into use in a short time. Choose machine tools that are reasonably structured, well-made, and have been mass-produced. Generally, the more users there are, the higher the reliability of the CNC system.