Structure Design And Analysis Of Machine Tool Column With Truss Stiffeners

As we all know,the vibration of the machine tool has a destructive effect on the metal cutting process.It will not only reduce the machining accuracy of the equipment,but also affect the surface quality of the product,even more shortened the life cycle of machine tools.Therefore,how to attenuate the vibration and decrease the noisy has become a hot issue that researchers have long been concerning and making efforts to solve.In this paper,the important support parts of machine tool column as the research object.In order to enhance the static stiffness of machine tool column as well as promoting dynamic behavior,the study come up with a novel approach to redesign interior structure of machine tool’s column.It is difference from the original ordinary style,the new designed was no longer composed of ordinary thin plates,but using sandwich panel with periodic distribution of unit cell truss structure.Because the truss and sandwich structure has many excellent character like higher specific strength and stiffness,lower relative density,and better shock resistance.Firstly,the research set up three difference unit cell structure models of sandwich plate and calculated the equivalent thickness of ordinary thin plate with same weight,then,analyzed the bending and torsion stiffness of sandwich panel as well as the ordinary thin plate with same weight,to make sure whether sandwich panel can meet the stiffness requirement of machine tool column.The result shows that the capacity of the three kinds of sandwich panels to resist bending and torsion is better than that of ordinary plates with same weight.Next,intuitively compared the bending and torsion resistance performance of machine tool column,which is composed of sandwich plates and thin plates.The result shows that the sandwich column with truss structure can greatly improve the torsion and bending resistance in some directions.Besides,the first ten modal frequency of the sandwich columns with truss structure are obviously higher than those of the ordinary thin plate columns.Finally,this study has referenced vibration transmission properties of phononic crystals,try to fill a certain volume of rubber material in the micro-truss sandwich panel,and the modal analysis and harmonic response analysis has carried out by finite element software ABAQUS for machine tool column before and after filling rubber.Dynamic response change of the column after filling rubber has studied when assigned different elastic modulus value of rubber material,and the influence of elastic modulus of the filler on the vibration performance has also analyzed.As the result shows that it is better to avoid the resonance of the machine tool in the low frequency by using the micro-truss sandwich structure.After filling rubber material,the amplitude response of the column under the same harmonic load excitation has improved to a certain extent,and the amplitude displacement response increases with the increase of the elastic modulus of the filler in a certain range.