Surface roughness modeling of thread workpieces in whirlwind milling considering material deformation
Surface roughness has an important influence on wear resistance,fatigue strength and contact stiffness of the workpiece.In the process of metal cutting,the surface roughness is greatly affected by the deformation of the workpiece material.An elastic recovery height model for workpiece material deformation was established based on the Hertz elastic contact theory,and a plastic deformation height model for workpiece material deformation was proposed based on the calculation principle of friction and wear.A residual height model of the workpiece surface was established by analyzing the contact motion between the tool and the workpiece.A theoretical model for surface roughness of ball screw whirlwind milling was established based on the influence of workpiece material deformation and residual height.The surface roughness model was validated through whirlwind milling experiments,and results showed that the theoretical model values were in good agreement with the experimental values.The influence of cutting parameters(cutting speed,maximum cutting depth,and number of tools)on surface roughness was analyzed.The relationship between deformation of workpiece materials and surface roughness was revealed.
NETL
NSTL
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