The main reason is the geometric accuracy error of milling machine and the lack of rigidity of machine tool.
1. Geometric accuracy of milling machine:
The straightness error of the axis movement of the coordinate axis of the machine tool in the two moving directions of the workpiece;
The Perpendicularity Error of the special movement of the axis of the spindle and the two moving directions of the workpiece;
The axial movement of the spindle and the radial runout error of the taper hole of the spindle.
2. Machine tool stiffness:
The rigidity of the machine tool is insufficient. When machining a plane with a large cutter head, the deformation of the machine tool increases due to the increase of cutting force and spindle torque, resulting in an increase in the perpendicularity error between the spindle axis and the axis in the two moving directions of the workpiece;
3 other factors:
The workpiece clamping of milling machine is not reliable, and the workpiece movement and vibration during machining with large cutter head are belong to and vibration;
The workpiece itself is just insufficient, and the workpiece gives way to the cutter and vibrates when machining the large cutter head;
The rigidity of the cutting tool is insufficient or the clamping is not firm, and the cutter moves and gives way to the cutter during the large cutter head processing;
All the above factors can make the flatness of parts processed by milling machine out of tolerance.
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