Process Parameters Of Micromilling

Nowadays,micro parts have been widely used in many areas such as aerospace,modern medicine,electronic industry,national defence industry and so on.Meanwhile,the requirement of structure function to micro parts has become more and more high.In the micro cutting processing technology field,micromilling has become the principle method in micro size processing owing to its process characteristic such as high-machining precision,high-efficiency,strong machining ability of three-dimensional,Wide applicable of workpiece materials and so on.Microscale milling is one of complicated surface shaping process.In the milling process,the side edge of cutter and the bottom edge of cutter take part in the milling process simultaneously.however,the milling of the two different edges is two entirely different ways of milling,and the impact that the two different ways of milling have on the surface quality of parts is also distinguishing.However,there are limited studies on only-side-edge milling and only-bottom-edge milling at present.In fact,the most practical purpose of the study of micro scale milling is to obtain the better surface quality and the higher machining efficiency.The surface quality of workpiece is affected by the combined action of side edge and bottom edge of milling cutter.Therefore,it is necessary and significance to respectively conduct research on side edge milling and bottom edge milling.Firstly,this project creates the three-dimension finite element model of only-side-edge milling and only-bottom-edge milling.There are two different craft ways in the side edge milling,one of that is radial depth of cut is equal or greater than radius of cutter and the other is that radial depth of cut is less than radius of cutter.The research and analysis of the finite element models are proceeded by using the software DEFORM.The critical milling parameters value of the minimum undeformed chip thickness(MUCT)is judged by analyzing variation trend of milling force in the simulation.Secondly,the milling test of only-side-edge milling and only-bottom-edge milling are carried out on the developed triaxial desk micro scale milling tool based on simulation result.The test has obtained the critical parameters value of the MUCT and verified the conclusion acquired in the simulationFinally,according to the critical parameters value which is acquired in the simulation and single edge milling test.The orthogonal experimental design method was used to conduct optimization experiment research.Milling force and surface roughness is counted as the judgment standard.The optimized milling parameters are obtained by analyzing the experiment result.This project has got the critical parameters value of the MUCT and the optimized parameters.It is significant to further enhance the precision of the micro scale parts.It also has scientific significance and practical value for the follow-up study of micro-scale milling technology.