Tool selection and determination of cutting parameters in Disc Type Special Machine processing are completed in the human-computer interaction state, which is in stark contrast to ordinary machine tool processing, but also requires programmers to master the basic principles of tool selection and determination of cutting parameters, and fully consider the characteristics of CNC machining when programming. Able to correctly select the tool and cutting amount. CNC machining tools must adapt to the characteristics of high speed, high efficiency and high degree of automation of CNC machine tools, and generally should include universal tools, universal connection tool handles and a small number of special tool handles. The tool handle should be connected to the tool and installed on the machine tool power head, so it has been gradually standardized and serialized.

Tool selection is carried out in the human-machine interaction state of NC programming. The tool and handle should be correctly selected according to the machining capacity of the machine tool, the performance of the workpiece material, the processing procedure, the cutting amount and other relevant factors. The general principle of tool selection is: easy installation and adjustment, good rigidity, durability and high precision. On the premise of meeting the processing requirements, try to choose a shorter tool handle to improve the rigidity of the tool processing. When selecting the tool, the size of the tool should be adapted to the surface size of the workpiece to be machined. In production, end milling cutter is often used to process the peripheral outline of plane parts. When milling the plane, carbide blade milling cutter should be selected; High speed steel end mill is selected when processing convex and groove. Corn milling cutter with cemented carbide blade can be selected when machining blank surface or rough machining hole; Ball end milling cutter, ring milling cutter, conical milling cutter and disc milling cutter are often used for the machining of some vertical surface and variable bevel contour.

In the free-form surface (mold) processing, because the cutting speed of the end of the ball head tool is zero, so in order to ensure the processing accuracy, the cutting line spacing is generally used at the top, so the ball head is often used in the finishing of the surface. The flat head tool in the surface processing quality and cutting efficiency are better than the ball head knife, therefore, as long as the premise of ensuring but cutting, whether it is rough machining or finishing of the surface, the flat head knife should be preferred. In addition, the durability and accuracy of the tool and the tool price is greatly related, it must be noted that in most cases, the choice of a good tool although the tool cost increases, but the resulting improvement in processing quality and processing efficiency can make the entire processing cost greatly reduced.

On the machining center, various tools are respectively installed on the tool library, and the tool selection and tool change action are carried out at any time according to the program. Therefore, the standard tool handle must be used in order to make the standard tool for drilling, boring, expanding, milling and other processes quickly and accurately installed on the machine tool spindle or tool library. The programmer should understand the structural size of the tool handle used on the machine tool, the adjustment method and the adjustment range, so as to determine the radial and axial size of the tool when programming.

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