| As hard-cutting materials, CFRP/ titanium alloy are widely used in aerospace field. In assembly process of aviation parts, large number of holes needs machining in CFRP/titanium laminated materials. So the efficiency and quality of holes waiting to be processed are very important for improving the efficiency of assembly process. Therefore it is necessary to study the hole machining processing and optimize the special tools. Based on the cutting mechanism of CFRP and titanium, this paper do some research on tool optimization and experimental study. Contents are as follows.The velocity of tool center point, axial feed and helical angle can be determined through the study of helical milling kinematics. Based on the cutting theory, the range of tool angle can be selected by finite element simulation. Then the tool parameter choice and optimization scheme are completed according to the cutting influence factors.On the basis of the parametric modeling theory of CAD system, tool model and three-dimensional part template are established. Tools can be completed rapidly by parameter driving. The stepladder design of tool edge part and tool neck can decrease the wear of machined surface. The double fillet of tool nose can enhanced the strength of basic-cutting edge. The unsymmetrical design of chip pocket is beneficial to chip removal.According to the design scheme of tool optimization, tool wear experiments for machining titanium, CFRP and CFRP/ titanium are completed. Cutting force, tool wear and hole qualities are also studied. The analysis of processing difficulties provides reference for the optimization of processing technology. |
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