English 
Tool selection is carried out under the human-computer interaction state of CNC programming. Precision parts processing – a variety of accessories widely used in automobiles, communications, medical clocks, mobile phones, computers and other industries. Unlike ordinary parts, precision parts are more precise and more suitable for industries that have high requirements for precision. Fixtures are a very convenient and fast auxiliary tool during the processing of workpieces. Therefore, it is even more important to design suitable fixtures and fixtures for small-volume and diverse processing methods.
The material removal manufacturing process of mechanical parts processing ((10) m <0) The material removal manufacturing process is to remove excess material from the workpiece in a certain way to obtain parts of the required shape and size. This type of process requires the surface of the workpiece to be sufficiently polished. According to the processing capacity of the machine tool, the performance of the workpiece material, processing technology, cutting parameters and other related factors, the correct selection of tools and handles.
The general principles for tool selection are: easy installation and adjustment, good rigidity, high durability, and high precision. Under the premise of meeting the processing requirements, try to choose a shorter tool holder to improve the rigidity of the tool.
When selecting a tool, make sure that the size of the tool corresponds to the surface size of the workpiece to be machined:
End mills are often used to process the peripheral contours of planar parts;
When milling planes, carbide blade milling cutters should be selected;
When processing bosses and grooves, high-speed steel end mills are used;
When machining the blank surface or rough machining holes, the corn milling cutter with carbide blade can be selected;
Three-dimensional surface and variable cone contour processing, commonly used ball end milling cutters, arc milling cutters, cone milling cutters and disc milling cutters.
When machining a free-form surface, since the cutting speed at the end of the ball-end milling cutter is zero, in order to ensure the machining accuracy, the distance between the cutting lines is generally very close, so the ball-end milling cutter is often used for the finishing of the curved surface. Flat cutters are superior to ball-nose milling cutters in terms of surface finish quality and cutting efficiency.
It is worth mentioning that the durability and accuracy of knives have a lot to do with the price of knives!