The Geometric Angles of Cutting Tools and the Types of Their Reference Systems in Precision Parts Processing
There are two types of geometric angles of tools in precision parts processing: one is that the tool is regarded as a geometric entity, which is used to determine the angle of the geometric position of the cutting edge and tool face relative to the positioning datum of the tool during manufacturing, grinding and measurement, which is the angle marked on the tool working drawing, and this kind of angle is called the static angle or marked angle of the tool;
The other is used to determine the geometric angle of cutting edge and cutter face relative to the tool in the cutting process, which is the actual geometric angle in the process of tool working. This angle is called the tool working angle.
In order to define the working angle of the tool, a reference system consisting of two sets of corresponding planes must be established for the tool in precision part machining. One is the static reference system that defines the static angle of the tool, and the other is the working reference system that defines the working angle of the tool. Its constituent planes should be defined according to the direction of the composite cutting force and the direction of the feed movement in the actual cutting process.
When establishing the static reference system, it is necessary to assume that the tool is in a certain working state, and the assumed main motion direction and assumed feed motion direction of the tool are perpendicular to the milling cutter axis. Tool static angle and static reference are widely used, while tool dynamic geometric angle is more complex.
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