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Development Of Nano Modified Ceramet Cutter And Its Digital Design For The Geometical Parameters

Posted on:2004-09-24Degree:DoctorType:Dissertation
Country:ChinaCandidate:F XieFull Text:PDF
GTID:1101360122455076Subject:Mechanical Manufacturing and Automation
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Ti(C,N)-based cermet is a new kind of tool material and was developed in 1970's. Because it owns many excellent properties such as low density, higher hardness and red-hardness to carbide, chemical stability, good inoxidizability, less friction coefficient to steel, higher thermal expansion to carbide, and contains no or less resource-limited and expensive WC and Co, it is applied to industrial production to promote work efficiency and decreases the cost. Therefore, Ti(C,N)-based cermet is studied deeply home and abroad, and has wide use in metal cutting as a new type of cutting tool's material. Its disadvantage is that it has less strength and toughness, so the problem for raising its strength and toughness has been paid attention by material and metal-cutting researchers.It is this problem that is studied in this dissertation. The author develops a new kind of tool material of nano-TiN modified TiC-based cermets by nano technology, then researches the cutting properties for using this cutter and analyzes its wearing reasons, approaches its wearing rules, in the end simulates the 2-D metal-cutting process adopting finite element method (FEM), gets the stress distribution in the developed cutter body, and optimizes its geometrical parameters.Main study and creative work include the following parts:Chapter One firstly overviews the development of cermet cutter and its general situation in research, analyzes its material's and structure 's characteristics, states its applications in industry, introduces the inherent properties owned by nano-technology and nano-material, especially represents the mechanisms and researching status on nano-modification technology (modifying the material's properties by adding nano-powder in conventional material). In the following part it summarizes the application and update development of FEM in metal-cutting principle. Finally, the backgrounds of the research project in this dissertation, purposes and main jobs of the project are given.In Chapter Two, in order to develop excellent Nano-TiN modified TiC-based cerment cutter, the dispersion process and suitable dispersing mediator are studied,7and its fabricating technique is also explored and specified to exploit the advantages of nano-powder modification effect. Using the developed dispersing and making process, the author researches the properties of TiC-based cermet cutter material when nano-TiN was added solely and mixed with M-m-TiN, discovers that both of the two nano-powder modifications can make its mechanical properties better to some extend, finds the optimal amount of the additive nano-TiN powder by experiments, in the same time analyzes the fundamentals for promoting the toughness of developed cutter by adding nano-powder. In the end the nano-TiN modified TiC-based cermet cutter is fabricated to utilize the optimized dispersing process and additive amount of nano-powder, and the mechanical properties of the developed cutter are also tested and analyzed.In Chapter Three, various cutting tests are done using developed cermet cutter. Depending on the present study situation at home and abroad, the reasonable matching of developed cutting tool with workpiece materials and its wearing mechanism when machining are discussed fully. The experiment results show that the developed cermet cutter is suitable to machine plastic materials and shows excellent cutting properties, but it has no advantage when machining brittle materials such as gray cast iron. Besides, through cutting tests the life's pattern of the cermet cutter which is affected by three cutting parameters is gotten when they are used for cutting normalized 45 steel, and the causes to generate the cutter's wear are also discussed.In Chapter Four, after the deforming principle of metal-cutting process is sufficiently investigated, the finite element model for the two-dimensional metal-cutting process is built and simulated through using the international large-scale universal FEM software. Some problems met in the simulation are also discussed such...
Keywords/Search Tags:TiC-based cermet, nano-TiN modification, cermet development, metal cutting, tool's life, tool's wear, finite element method, metal-cutting process simulation, optimization of geometrical parameters of cutting tool
PDF Full Text Request
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