Research on the Dynamic Mechanical Characteristics of the Tool Life in the Excessively Heavy-Duty Cutting Process

Abstract

Basing the foundation on the cutting experiments of 2.25Cr-1Mo-0.25V steel which is the material of hydrogenated cylindrical shell, the dynamic mechanical characteristics of the excessively heavy-duty cutting were analyzed. Then through researching the influence that the dynamic mechanical characteristics had on tools failure in limited heavy-duty cutting process, and the model of dynamic shearing force in cutting area was established. However, the experimental results showed that the dynamic shear-flowing-stress in cutting area had great influence on tools fatigue, and the mainly damaged form of the heavy-duty cutting tool was shearing fracture. Analyzing the theory comprehensively, the critical condition of tools fracture which was under the terms of extreme loading had been established finally.

Research on Machinability of the Shell Materials and Tools' Failure

“…Large cylindrical shell material is high temperature and high strength steel with certain alloy content, and can obtain very high strength after modified treatment. The hardness is about HB235 and the tensile strength is more than 1GPa [1].The chemical constituents and physical properties are shown in table 1. The rough machining of shell is very difficult after modified treatment.…”