Chip Breaking Mechanical Property Analysis In Processing Cylindrical Shell Material And Optimal Design Of Tool

With the development of refining industry and nuclear industry in the world,application of large components is wider and wider and the manufacturingtechnology is more and more advanced. Cylindrical shell material2.25Cr-1Mo-0.25V steel is the main used material in refining industry and nuclear industry,which belongs to difficult-to-cut material, and its process technology stands forthe level of the industry of a country. In heavy-duty cutting cylindrical shellmaterial process, the removal rate is high, machining condition is rough,adhering damage and impact damage phenomenon often happen to cutting tool.Because the viscosity of cylindrical shell material is big, the large chips are notprone to break, and wind the tool and workpiece which decreases the machiningefficiency. At present the technology of tool of heavy-duty at home is not mature,hence research and development of high performance tool suitable for heavy-duty condition is of great significance. In the article, aiming to difficult-to breakcharacteristic of heavy-duty, the generating, curling and breaking mechanism oflarge chips are studied, the breaking mechanical property of large chips isanalyzed and tool of heavy-duty cutting cylindrical shell material is designed.The main research contents in the article are followed:Firstly, the cutting performance experiment is carried out aiming tocylindrical shell material using different three-dimensional groove blades. Thebreaking scope figure is drawn and the influence of three-dimensional groove onbreaking effect is analyzed. The chips form of cutting cylindrical shell material issummarized. The cutting force and cutting temperature produced under differentparameters of different blades are compared and analyzed. And the groove of the best performance is optimized for providing basis for designing heavy-duty tool.Secondly, the form of large chips produced in actual processing field isanalyzed. The generating, curling and breaking of large chips are analyzed basedon FEM software. The breaking mechanical property of large chips is analyzedand mathematics model of breaking mechanical property is established, whichprovides theory basis for studying influence of groove on curling and breaking ofchips.Thirdly, based on above experiment and theory analysis, heavy-duty cuttingtool is researched and developed from the aspects of tool material, tool shape,cutting edge, geometry parameters and geometry structure of groove.At last, new designed heavy-duty tool in carried out three-dimensionalcutting simulation using Thirdwave AdvantEdge and Deform-3D. The chip-breakeffect is observed and cutting force and cutting temperature are analyzed toverify feasibility of new groove of tool.