Modeling of instantaneous cutting force for large pitch screw with vibration consideration of the machine tool

The instantaneous cutting force is the key indicator to impact surface quality of the workpiece and processing performance. In this article, from the point of view of machine tool processing system, the instantaneous vibration is decomposed into the effect of the structure of the machine tool feed system and the theoretical cutting force on the tool vibration. The instantaneous cutting forces of the large pitch screw turning process predicted the left and right edge cutting, and the precision machining experiments are carried out by turning large pitch screws of different materials, pitches, and diameters. The results show that the experimental cutting force and the predicted instantaneous cutting force error are within a reasonable range (≤ 15%). It should be noted that the feasibility of the established large pitch screw finishing instantaneous cutting force method is proved.