Mathematical model for comprehensive error analysis of NC machine tool machining process

Inhalt:
Aiming at the geometric errors that affect the machining accuracy of CNC machine tools and the errors caused by cutting forces, the homogeneous coordinate transformation matrix of each component with errors relative to adjacent components is derived by using the principle of homogeneous coordinate transformation, and 21 geometric error elements and 35 cutting force error elements in the machining process of three-axis CNC milling machine are identified. Because the NC machine tool in the process of machining can be regarded as a new transmission chain, one end of the chain is the tool of the machine tool, and the other end is the workpiece to be machined. According to the relationship that the coordinates of the theoretical cutting point of the workpiece and the theoretical cutting point of the tool are the same in the basic coordinate system of the machine tool, the mathematical model of the comprehensive error in the machining process of the NC machine tool including geometric error and cutting force error is derived.