Study On The Influence Of Machining Surface Quality Based On Vibration State Of Motorized Spindle

The motorized spindle is a new type of spindle that can realize high-speed machining.However,in the actual cutting process,the spindle itself has a certain amount of unbalance and is affected by the cutting force.The spindle will vibrate during the cutting process.The phenomenon that the surface roughness of the workpiece has not reached the standard is seriously affected,so it is important to study the influence of the vibration state of the motorized spindle on the surface quality of the machined surface.For the problem of 2738 mold steel roughness not met by Tianrui Precision Machinery corporation,this paper designs the milling test of 2738 die steel,and studies the unbalanced response of the spindle and the Law of influence of spindle vibration state on surface roughness through test data induction and analysis,mathematical model establishment,theoretical analysis and prediction model establishment,and predicts the roughness,which provides a theoretical basis for the control of roughness in the actual production process.First,the solution process of the transfer matrix is described,the transfer matrix method is used to analyze the unbalanced response generated by the spindle under unbalanced quantity,the damping of the bearing is determined,and the bearing damping is added to the calculation process.The influence law of the unbalance on the spindle on the front end of the tool holder is obtained and analyzed.Second,the theoretical model of surface roughness is established,and the influencing factors on the surface roughness of the machined surface is explained.the single factor test of 2738 die steel milling is designed and completed,the influence law of the spindle's rotation vibration on the surface roughness was studied.The machining surface was scanned by super depth of field microscope and the surface roughness influence law was analyzed,the prediction curve for the "critical value" of the spindle's rotation vibration value is established to analyze whether the rotation vibration will affect the surface roughness.Third,the cutting process was simulated to study the influence of cutting parameters on the cutting force.the single factor test of 2738 die steel milling is completed,and the influence of the spindle's cutting vibration on the roughness under three different roughness values is studied,the surface roughness influence law was analyzed.The influence of the cutting vibration value on the machining roughness is analyzed by the prediction curve for the "critical value" of the spindle's cutting vibration value.Finally,the orthogonal test is designed and completed,and the test data is analyzed.The related parameters of BP neural network prediction model are designed.The BP neural network method were used to establish the prediction model of surface roughness about the spindle's rotation vibration,cutting vibration and feed rate,and the prediction models were verified,with the established prediction model,the problem of roughness non-compliance in the production process can be effectively solved.