The invention discloses a precision compensation method of a composite
numerical control machine tool, and particularly relates to the technical field of precision control of the
numerical control machine tool, which comprises the following steps: synchronously acquiring temperature, vibration and force information under the driving of a unified
clock through multiple types of sensors deployed at key nodes of the
machine tool, and generating a synchronous multi-source
sensing data set with aligned timestamps; inputting the
data set into a multivariable
coupling error model obtained through data driving training, and calculating and generating a comprehensive space volume error predicted value of a tool
nose point of the tool; performing inverse calculation based on a
machine tool kinematic chain model, and generating a multi-dimensional micro-compensation
instruction set containing the compensation amount of each motion axis and the sequential relationship; and finally, dynamically writing the
instruction set into a
servo control ring of the
numerical control system through a real-
time data interface, and driving each motion shaft to execute synchronous compensation motion. According to the method, comprehensive compensation of multi-
physics field
coupling errors such as temperature, vibration and force load is achieved, and the
machining precision and stability of the numerical control
machine tool under complex working conditions are improved.