Preparation And Surface Gringding Of Composite Extrusion Roller

Composite material roll is a kind of extruder roll,which is made of nonwovens as the main material.Which assembed by cores and nuts.It is an important part in the post processing of cold rolled sheet production line.It is used to remove the rolling oil and small metal impurities on the surface of the rolled sheet.Improving the quality of cold rolled sheet products.At present,rubber rolls are mainly used as extrusion rolls in cold rolling production lines.However,rubber rolls are prone to aging and cracks,with general extrusion effect,inconvenient disassembly and low working life.Comparing with traditional rubber extrusion roll,composite roll not only has better oil removal effect and longer working life,but also can remove minor impurities on the surface of sheet metal to improve the quality of sheet metal due to its unique porous compressibility and self-healing property.The surface grinding of composite roll is the last step in the process and assembly of composite roll,and it is also a very critical step.The grinding quality not only determines the surface quality of the composite roll,but also affects the extrusion effect of the composite roll.Therefore,it is important to study the surface processing of composite roll for improving the performance of composite roll.On the basis of previous research,the material characteristics of nonwovens are combined.The surface grinding of composite roll is studied.The grinding force and temperature are the main factors to consider the grinding quality.Grinding force and grinding temperature are two basic physical quantities in grinding process.Grinding force originates from elastic and plastic deformation after grinding wheel contacting with workpiece and friction between abrasive particles and binder and workpiece surface.Grinding temperature is mainly produced by friction and chip deformation energy.For nonwovens of polymer materials,due to the formation mechanism of chip and metal material.Material is very different,so it is reflected in the grinding force and grinding temperature are also very different.The ABAQUS finite element analysis software was used to simulate the single particle grinding process.The effects of grinding speed,grinding depth and particle size on grinding force and temperature are obtained.The influence of several grinding parameters on grinding force and temperature is analyzed by orthogonal range method.Finally,the optimal grinding parameters are determined by grinding experiments on cylindrical grinders,and the surface roughness,fiber quality and surface porosity of rolls before and after grinding are measured.According to the grinding force curve,the influence of grinding depth,grinding speed and particle size on grinding force is obtained.For nonwovens,the influence of grinding depth and grinding speed on grinding force is not linear.The reduction of grain size will lead to the increase of grinding force.According to the grinding temperature field,the influence of grinding depth,grinding speed and particle size on grinding temperature is linear.The optimum grinding parameters are obtained by orthogonal analysis.The composite roll was grinded by a cylindrical grinder.The surface quality of the roll was measured by TR220 and scanning electron microscopy.The conclusion of finite element analysis was verified.It is concluded that the surface quality of roll surface is better and the surface porosity is better when grinding parameters are processed.It is proved that the grinding under conditions of the speed of grinding wheel is 750r/min,grinding depth is 10 um and abrasive particle size is 150~#can meet the requirements of enterprises and provide guidance for the preparation and processing of composite rolls.