Study On High Heat Conductity Ceramic Bond CBN Grinding Wheel For Grinding Titanium Alloy

Titanium alloy with its superior performance in the field of aerospace,engine and other special material filed has been widely used.But the workability of titanium alloy is very poor due to its own characteristics.In the process of machining,titanium alloy will appear severe adhesion,high temperature,big grinding force and surface quality difficult to be guaranteed.For this problem,this paper designs a special CBN grinding wheel for titanium grinding,which is used by high hardness and sharp CBN grits,whose binder is used by ceramic bond with good chemical stability and corrosion resistance,and choosing the high heat conductivity of graphite as the additives according to the principle of material.Through the analysis of the effect of graphite for ceramic bond about refractoriness,liquidity and flexural strength,and the composite spline microstructure changes was analyzed after adding graphite.Through the comprehensive consideration,design a new type of high heat conductivity ceramic bond CBN grinding wheel.In addition,this paper does simulation about signal particle grinding titanium alloys based on abaqus,analyses the process of single particle grinding chip formation,the change of the grinding force,the change of grinding temperature,does enough theory research.Finally,through compare self-made the grinding wheel of high heat conductivity purchased general grinding wheels,to explore the advantage of high heat conductivity grinding wheel.Research shows that:with the increase of graphite content,a dramaticly rise in the refractoriness of ceramic bond,ceramic bond liquidity presented decrease trend,bending strength decline trend.From the composite spline microstructure analysis,with the increase of graphite content,degree of composite spline vitreous ceramic bond gradually becomes poor,abrasive parcel gradually decline,binder bridge of abrasive become fracture seriously.When the graphite content is 2%,refractoriness of ceramic bond fell not seriously,liquidity is more reasonable,porosity of composite spline and rate of containing scrap also increases,has advantage for titanium alloys grinding.Through analysis.produce the high heat conductivity ceramic bond CBN grinding wheel.In this paper,using abaqus simulates chip formation process.When grinding grain began to cut into the workpiece,the workpiece starts deformation by extrusion,the area contacting with grinding blade has larger stress,grinding temperature of the workpiece focus on second deformation area,abrasive grinding heat is mainly on the cutting edge area.With the grinding going on,the first deformation area appear large deformation and stress concentration belt,produce high shear heat.grid deformation of second deformation area in workpiece is bigger,shows serious friction that Proving this area brush seriously slide and big plastic deformation.abrasive grinding heat is mainly due to wipe role is focused on the rake face of slide.In this paper,through contrast experiment found that high heat conductivity CBN grinding wheel is better than general wheel in grinding temperature,grinding force,surface roughness and surface quality.Under the condition of high speed grinding,titanium alloy does not appear burns after self-grinding wheel grind,the surface adhesion is reduced and the surface more smooth.