Research on the Tools' Strength in the Condition of Uncommonly Dynamic Heavy-Duty Loads

摘要

Introducing the machining-ability of the surface of hydrogenated cylindrical shell's blank, and the analysis showed that one of the main macroscopic factors which caused the tool to be broken early was forging defect. According to researching on both failure mechanisms and rules of the heavy-duty turning tool's fracture, the conclusions that the dynamic load led into the crack then made the tool to be broken could be drawn. Then, the finite element simulation was utilized to analyze the tool's working state under dynamic load condition, and the simulation results verified the correctness of the conclusion. For improving production efficiency and providing a reference for the prediction of tool breakage, finally, the critical time model of tool breakage under the condition of dynamic cutting was built, and the measures of preventing tool's premature failure were developed.