Research On Cutting Force Modeling And Surface Quality Of Glass Materials In Ultrasonic Assisted Grinding

Glass materials(such as sapphire glass,quartz glass and microcrystalline glass)have been paid more and more attention due to their good mechanical,optical,thermal and stable chemical properties.With the development of glass crystal manufacturing technology and the decreasing of the cost of preparation,the application of glass materials has been greatly expanded.At present,the removal of glass materials mainly uses grinding.However,due to its high hardness and brittleness,it is easy to break,edge collapse and sub-surface damage.Therefore,it is difficult to realize the processing efficiency and ideal surface quality.Based on the above problems,the ultrasonic assisted high efficiency grinding technology and method of sapphire glass,quartz glass and glass ceramics are studied.The cutting force model of plastic brittle transformation is constructed,the mechanism of plastic embrittlement transformation is explored,and the surface roughness and surface morphology of glass material are studied experimentally.The specific work is as follows:(1)The cutting force modeling of ultrasonic assisted grinding of glass materials is carried out.A cutting force model which can consider both the transformation mechanism of plastic and brittle and the shape of different grinding particles(triangle and rectangle grinding)is proposed.The relationship between the average cutting depth and critical cutting depth is established in the plastic and brittle areas respectively,and the cutting force expression in the plastic and brittle areas is substituted Finally,the cutting force expression of two regions is replaced in the final cutting force model.(2)The experiments of ultrasonic grinding and non-ultrasonic grinding of sapphire glass,quartz glass and microcrystalline glass were carried out.The single factor experiment was verified and multi factor experiment was optimized,and the differences between the three were compared.The results show that the cutting force of three kinds of glass decreases with the increase of spindle speed,increases with the increase of feed speed and cutting depth,and the cutting force decreases greatly compared with non-ultrasonic.The three glass,whether ultrasonic or non-ultrasonic,are the least cutting force under high speed,low feed and low cutting depth through multi factor experimental analysis.(3)The surface roughness test and surface morphology experiment of three kinds of glass were carried out.The differences existed before comparison in the micro angle were carried out.The conclusion is that the improvement of speed has the effect of improving the surface roughness and the appearance.The increase of cutting depth makes the ultrasonic effect weaker,which is not conducive to the improvement of roughness and surface morphology.The ultrasonic can make the scratch on sapphire glass disappear or become shallow,and the surface of quartz glass is broken in large area and the surface Scorch is improved,and the small area of glass ceramics surface is gradually reduced.(4)The ultrasonic and non-ultrasonic grinding experiments of three kinds of glass with different grain size were carried out to study the differences of cutting force,surface roughness and surface morphology of the three kinds of glass with the change of grain size diameter.The following conclusions were drawn: the cutting force of three kinds of glass fluctuated with the increase of grain size,but showed a decreasing trend;quartz glass fluctuated the most with the increase of surface roughness,The results show that the fluctuation of sapphire glass is the smallest,and the surface morphology of three kinds of glass changes irregularly under ultrasonic,but compared with nonultrasonic,the surface quality is improved to a certain extent.