The Experiment Of The Cutting Performances Of Chemical Mechanical Polished Carbide Blade

Carbide insert has high hardness, wear resistance, low expansion coefficient, good anti-adhesion and good mechanical properties, so that in the field of machining is widely used, changing the high-speed steel cutting tools domination. However grinding is the prime method of processing carbide tool at present. Meanwhile the grinding burn and cracks in the surface of carbide tool will occur if the grinding force and grinding temperature and surface roughness are not well manipulated. These flaws in the carbide tool insert will influence the cutting performance and life-time expectation. As one of precision and ultra precision machining method, chemical mechanical polishing(CMP) can not only avoid the surface damage and reduce the processing surface roughness, but also reduce the small heat effects. CMP is undoubtedly the important processing method of carbide inserts to obtain precision super-finishing operation, focusing on cutting performance of the CMP polished carbide inserts, the research has an important engineering application value and theoretical significance. Therefore this paper put the cutting performance of polished carbide insert as a research object. In the first place, the process parameters optimizations are investigated by synthetic utilization of the orthogonal experimental design and the Taguchi method and variance analysis. The rules of the cutting force, cutting life, surface roughness and surface-hardening degree were compared by the cutting performance of polished Carbide insert and the grinding Carbide insert. The parameters influences on comparative cutting test are also carried out i n this experiment. The cutting performance is compared based on the data of experiment. Concrete research works are summarized as follows:1)The preparation of CMP polished carbide insert. The multistep process planning is manipulated during the process of carbide-tipped tool insert. And the surface roughness is considered as the polishing quality evaluation index, the optimization of process parameters is conducted by the orthogonal experiment and the Taguchi method. A series of low roughness polished tool with optimal process parameters combination are obtained by this method, and the microscope and the surface roughness measuring instrument are used to observe the surface morphology and surface roughness.2)The effects of cutting parameters on cutting force are analyzed by using single factor method, the empirical formula are established by these experiment. And this formulation reveals the reason why polished tool has excellent cutting ability under the same cutting condition.3)The research on cutting life of CMP carbide tool.The wear conditions of rake face are under compared by using microscope and the life expectation curve of tool insert is fitted by the average flank wear value. After that the optimal polishing condition can be reached by life expectation curve.The analysis of surface quality with CMP carbide inserts. The surface integrity of turning specimen are investigated, the influence on surface integrity such as federate and cutting speed are analyzed in this paper. According to the comparison of test results, the influence of polishing carbide tool for turning surface quality is compared.In conclusion, the cutting theory of CMP carbide inserts are established according to t he research purpose.This process method has great influence on improvement of carbide-tipped tool insert cutting efficient, prolong carbide-tipped tool life expectation, lower manufacture cost and turning surface integrity.