Study On Friction And Wear Characteristics Of Milling Tool For High-Silicon Aluminum Alloy CE11

High silicon aluminum alloy,as taking the largest share in the aluminum market,it has a series of advantages such as small specific gravity,low thermal expansion,and good thermal conductivity.Therefore,it boasts a promising future of development.However,the increasing of silicon makes machinability of this kind of material reducing which results in high silicon aluminum alloy becomes a hard processing material.The existing literature shows that the use of carbide,PCD,diamond-coated cutting tool or high-speed machining technology can advantageously improve the high silicon aluminum alloy machinability.But considering the limitations of the overall domestic business equipment,the backwardness of operation systems and the gain of economic efficiency,the research on wear characteristics of carbide tool machining high silicon aluminum alloy can resolve the problems of serious wear and poor surface quality in the process of machining high silicon aluminum alloy,which has a more practical significance.This paper studied the tribological behavior of processing high-silicon aluminum alloy CE11 with carbide milling tool.By means of the force measuring system and infrared thermal image,the cutting forces and the temperatures of contact surfaces were measured in the process.Then the average friction coefficient was calculated by the cutting forces data gained.This average friction coefficient firstly provide data support to the simulation tool wear in the analog processing of high silicon aluminum alloy CE11.Secondly,the friction coefficient can be used to analyze the effects of spindle speed on friction characteristics,that is,i)the greater the spindle speed,the smaller the friction coefficient;ii)Friction coefficient showed a trend of decreasing first and then increasing over time in the course of friction;iii)The temperature of high silicon aluminum alloy changed little in the milling process while the friction coefficient was inversely proportional to temperature,i.e.when the temperature was highest,the friction coefficient was minimum.A model of single tooth milling cutter was established based on finite element simulation software Deform 3D.Then FEM(finite element method)was scheduled by orthogonal test method to simulate the process of tool wear in the simulation course of carbide tools milling high silicon aluminum alloy CE11 and analyze the impact of milling parameters on tool wear characteristics.In order to verify the validity and reliability of the simulation data,the experiments of tool wear were conducted in CNC machining center and the tool wear was measured by use of optical microscope.By contrast and analysis of the experimental results and simulation results,it can be concluded that the FEM can be used to simulate the milling process of high silicon aluminum alloy.