The invention discloses a
deep hole machining method for a large boring and milling
machine, relates to the field of
metal material
machining, and discloses the method comprising the steps that S1, rough
machining is conducted on a hole
system in a workpiece according to product requirements; s2, before the workpiece is transferred to finish machining equipment from rough machining equipment, coordinate and error vector evaluation is conducted on the workpiece according to the form and location tolerance type, and coordinates (Xn, Yn and Zn) are obtained; s3, the workpiece is fixed to finish machining equipment for alignment and positioning of a finish machining hole datum, a coordinate
system is established according to the form and location tolerance type, coordinates (X'n, Y'n and Z'n) are obtained, and then coordinate
system deviation is obtained; s4, according to the form and location tolerance type, coordinate system deviation compensation is conducted on the machining equipment, and then corresponding calibration datum holes are designed in all the holes of the hole system; and S5, finish machining is started, the calibration frequency is set, and the calibration reference hole is detected and compensated regularly in the finish
machining process till finish machining is completed. The manufacturing precision is effectively improved, and meanwhile the machining efficiency and the quality stability of products are improved.