In the process of precision CNC Machining, surface pitting is a common problem, and its causes may involve many aspects. The following is an analysis of possible causes: 1. Material problems Material surface quality: There may be defects, bubbles, impurities, etc. on the surface of raw materials for precision CNC machining. These may be enlarged or exposed during processing to form pitting. Material properties: The hardness, toughness, thermal conductivity and other physical properties of different materials are different, and the response to the machining process is also different, which may lead to the generation of pitting. II. Tool and cutting parameters

Tool wear: The tool will gradually wear out during use. The worn tool may produce unstable cutting force during cutting, resulting in pitting on the machining surface. Improper cutting parameter setting: The parameters such as cutting speed, feed amount, and cutting depth are not set reasonably, which may lead to excessive cutting force and excessive cutting temperature, resulting in pitting on the machining surface. III. Machining environment and conditions Cutting fluid problems: Impurities, sediments or bubbles in the cutting fluid may affect the cutting effect, resulting in pitting on the precision CNC machining surface. The concentration, temperature, flow rate, etc. of the cutting fluid also need to be controlled within a suitable range. Machine tool accuracy and stability: The geometric accuracy, motion accuracy and stability of the machine tool have an important impact on the machining quality. Wear or loosening of the guide rails, screws and other components of the machine tool may lead to inaccurate machining position, resulting in pitting. IV. Process Design Clamping and Positioning Mode: Unreasonable clamping and positioning mode of the workpiece during machining may lead to vibration or deviation of the workpiece during the cutting process, resulting in pitting on the machining surface. Process Route and Sequence: Unreasonable design of the process route or improper arrangement of the machining sequence may also lead to pitting on the machining surface. V. Other Factors The skill level of the operator: The skill level of the precision CNC machining operator has a direct impact on the machining quality. Insufficient skill level may lead to problems such as improper setting of cutting parameters and unreasonable tool selection, resulting in pitting. Equipment maintenance and maintenance: Regular maintenance and maintenance of equipment, inspection and replacement of wearing parts, and maintenance of equipment cleanliness and accuracy are essential to reducing the generation of pitting.