Study On Micro-Milling Force And Processing Mechanism Of AZ31b Magnesium Alloy

With the concept of innovation in the industry 4.0,the manufacturing industry has been moving towards intelligence,automation,high precision direction development,emerging technology emerge in endlessly,which combines the traditional milling and micro machining of precision machining technology has become the research focus in the research community is very active today.Micro-milling has the advantages of high processing precision,high flexibility,high quality of processed surface,and can realize 3D processing.Therefore,it is widely used in aerospace,biomedicine,defense electronics and other fields.Magnesium alloy material as industrial field practical structure of the lightest metal,good thermal conductivity,shock resistance,dimensional stability and excellent machining performance,especially the relatively higher than strength and specific stiffness,make it fully suitable for precision processing fields such as automotive and aerospace,however,due to the low yield point and elastic coefficient,flammability also reduces the magnesium alloy materials in the actual use value in the process of machining,the machining properties related research is very necessary.Based on the existing microfabrication research,the micro-milling force and machining mechanism of AZ31 b magnesium alloy are studied by theoretical analysis and finite element simulation.The accuracy of the model is verified by the HAAS machine test platform.The influence of different cutting parameters on micro-milling force and machined surface quality was analyzed at the same time.According to the existing cutting theory and its improvement,and set up the AZ31 b magnesium alloy micro mathematical analytical model of milling force considering the cutting edge blunt radius,minimum cutting thickness,scale effect,the tool effective angle tool deflection and other factors of micro-cutting processing characteristics.The finite element simulation of the micro-milling process is carried out by using the Abaqus / Explicit explicit dynamic analysis module,and introduces the plastic strain gradient material micro milling constitutive model is set up,get a new calculation method of the real effective rake Angle,and the chip formation and the conditions are analyzed,at the same time explore the cutting thickness and the influence of the cutting tool parameters on cutting force and dynamic mechanical properties of materials in the manufacturing process of change;Created based on the method of arbitrary Lagrangian-eulerian(ALE)3d finite element simulation model and write a subroutine to visualize the basic setup parameters,and obtained the different cutting parameters on cutting force in the process of micro milling.The micro-milling test of AZ31 b magnesium alloy with single factor and orthogonal method was carried out by using Rijin ?0.1mm milling cutter.The milling force and machined surface of different cutting parameters under actual processing conditions were obtained.The results show that the simulation results are in good agreement with the finite element simulation results,and the accuracy of the theoretical analysis is verified.Finally,the empirical formula of the cutting force of ?0.1mm milling cutter is established,which can achieve a certain state of micro milling force prediction.