(1) The influence of the boring tool of CNC machine tool on the quality of the boring hole. The improper selection of the geometric angle of the boring tool will affect the processing quality of the hole. For example, if the rake angle is too small, it will cause the boring bar to vibrate; Premature wear of the cutting edge; too small arc of the tool tip will affect the surface roughness of the hole wall; improper selection of the edge inclination may cause machining vibration or premature damage to the tool tip. Another example is that the quality of the front has a great influence on the chip removal during boring, and the front surface is uneven and rough, which will increase the heat in the cutting and chip removal process, and affect the machining quality of the hole wall surface. The rigidity of the boring bar has a certain influence on the quality of the boring hole. The slender boring bar will cause vibration during processing. Therefore, when using the cantilever boring bar, the shorter and larger diameter boring bar should be selected as much as possible. When the boring tool is clamped on the boring bar, it should extend as little as possible, but it should be noted that the extended length of the cutting edge should meet the machining allowance and be conducive to chip removal. The tail protruding part of the boring tool should be smaller than the protruding part of the tool nose, otherwise it will affect the boring process. When choosing a carbide boring tool for CNC machine tools, you should pay attention to the grade of carbide, otherwise it will cause abnormal wear of the tool, resulting in rough hole wall or uneven hole diameter and taper.
(2) The influence of milling machine accuracy on the quality of boring, CNC machine tool spindle accuracy will affect the surface roughness, cylindricity and other machining accuracy of the hole. The perpendicularity of the vertical milling machine spindle to the table surface affects the cylindricity of the hole. The accuracy of the support bearing of the horizontal milling machine bracket will affect the rotation accuracy of the tool holder, thereby affecting the dimensional accuracy and cylindricity of the hole. The stability of the feed of the worktable will affect the surface roughness of the hole wall, and in severe cases it will affect the dimensional accuracy of the hole.