Research On Formation And Prediction Of Sticking Failure For Carbide Tool In Cutting2.25Cr1Mo0.25V

In recent years, with the rapid development of science and technology, thedomestic petrochemical and coal chemical industry is rapidly expanding. As a keycomponent of the industry, the thermal-wall hydrogenation reactor tube section hasincreased the high temperature resistance, corrosion resistance and high temperatureductile of equipment. However, when the Tube Section Material2.25Cr1Mo0.25Vwas cutting, it will cause the cutting force to become larger and the cuttingtemperature to become higher in the cutting process. In that case, there will beserious failure in the tool and the tool life will also be significantly reduced, whilethe cutting efficiency is difficult to guarantee. That is the bottleneck of carrying outefficiently cutting tube section materials. Relying on the National Natural ScienceFoundation of China "Study on the sticking failure mechanism of tool when cuttingthe tube section materials with high efficiency and heavy duty"(ProjectNo.51075109). This paper aims at to reveal the sticking failure formation processand to forecast the sticking failure in the2.25CrlMo0.25V cutting process with theresearch methods of tool-chip relative sliding velocity and stress characteristics andthe cutting thermal simulation.First, by the sticking failure cutting experiment, the sticking failure tools whichwas the most serious was obtained, and the cutting force values when sticking failureoccurs will be studied. Base on the study of tool-chip contact state in the cuttingprocess, the relative sliding velocity of tool-chip and stress distributioncharacteristics on rake face of tools will be achieved.Secondly, based on the establishment of heat density function, the heatdistribution on tool surface and the maximum sticking failure depth position of toolwill be obtained. The cutting temperature measure by the infrared thermometer isused to analyze the influence of the cutting parameters on the temperature distribute. Through the finite element analysis of the temperature distributed field, thetemperature values on the rake face of tools will be sought and compared with theexperiment results.Finally, the formation conditions and process of sticking failure of tool were putforward through analyzing the impact of temperature and the element diffusion onsticking failure depth of tool, and the impact of the stress on the cracks as well as thecriterion of crack facture. Considering the factors as relative sliding velocity andstress distribution of tool-chip, temperature distribution on the rake face and elementdiffusion rate, a prediction model of sticking failure was built which was based onthe previous studies. The prediction result and the experiment result were validated.