23 Types of Milling Operations—(13–16)

13. Over-milling is a precision process that uses two side cutters to simultaneously machine two or more parallel, perpendicular surfaces. This method allows for the machining of full grooves or large-area surfaces in a single setup, improving machining consistency and efficiency. It requires the use of high-precision CNC milling machines to ensure that multiple cutting tools remove material from both sides of the workpiece synchronously and accurately. Common Applications Groove Milling: Machining grooves on parts Key and Keyway Machining: Manufacturing keys and keyways for part assembly in the automotive and aerospace industries Connecting Rods and Other Parts: Machining multiple symmetrical contours in mechanical parts Process Advantages High Efficiency: Simultaneous machining of two parallel surfaces reduces total machining time Good Consistency: Uniform machining quality across multiple workpieces meets high-standard production requirements

14. Contour milling is a process for precision machining the outer contours of parts, typically performed using CNC equipment to ensure tight tolerances and the machining of complex shapes. Depending on the contour requirements, end mills or face mills can be used, making this method suitable for machining precision and complex structures. Common Applications: Aerospace components: Parts requiring precise contours and lightweight designs, such as airframe structures. Automotive parts: Machining of complex-shaped and functional components, such as engine blocks. Decorative and functional parts: Machining of decorative and functional components in furniture and fixture manufacturing. Process Advantages: High precision: Capable of machining complex shapes and fine structures with high accuracy. High degree of customization: Capable of producing customized parts that meet specific design requirements.

15. Vertical milling is a general-purpose milling process that uses an end mill as the cutting tool. The tool rotates around its own axis while moving perpendicular to the workpiece’s axis. This process can machine various features such as slots, cavities, and contours, and is suitable for both vertical and horizontal milling machines. Tool materials include high-speed steel or cemented carbide. Common Applications: Groove Cutting: Machining grooves and recesses in metal parts; Complex Part Production: High-precision machining of complex parts such as gears and precision frames; Prototype and Mold Manufacturing: Machining prototypes and molds that require high precision and attention to detail. Process Advantages: High Versatility: Capable of machining a wide variety of shapes and features to meet diverse project needs; High Precision: Excellent machining accuracy and surface finish, suitable for complex designs.

16. Saw-milling uses circular saw blades for cutting, differing from the milling method employing traditional rotating cutters. This method is particularly suitable for long, straight cuts or slot machining in materials. Saw-milling equipment is equipped with high-power motors, enabling heavy-duty cutting and ensuring smooth, precise cuts. Common Applications Longitudinal Cutting: Cutting long pieces of sheet material in the woodworking industry. Material Cutting to Size: Slitting large metal sheets in metal fabrication. Groove Machining: Groove machining for various building materials. Process Advantages High Speed: High material cutting efficiency, significantly shortening the production process. High Precision: Straight, precise cuts with excellent surface finish.