Abstract
In this paper the influence of vibration on reflectivity is
systematically analyzed. A three-dimensional topography model of a
machined surface considering vibration is established first. Based on
the three-dimensional morphology model, the reflectivity of a diamond
turned surface is calculated by a rigorous coupled wave method. The
influences of cutting parameters on the diffraction effect of a
diamond turned surface are discussed. The predicted and experimental
results reveal that as the vibration intensifies with an increase in
cutting depth and feed rate, the peak–valley (PV) roughness of the
machined surface increases, which yields an increasing diffraction
effect, i.e., resulting in a decrease in reflectivity. When the
spindle speed is low, the tool and workpiece have a small sliding
velocity, causing a great deal of friction, which amplifies the
deformation of the workpiece surface. In this case, the PV value of
the machined surface roughness is large, leading to a greater
diffraction effect and bad reflectivity. With the increment of spindle
rotation speed, the friction is relieved quickly, but the vibration is
intensified, which produces increasing reflectivity. When the spindle
speed is set to about 1200r/min, the reflectivity reaches the maximum
value. When the spindle speed is larger than 1200r/min, the increase
of vibration is dominant, resulting in a gradual increase in PV
surface roughness and a decrease in reflectivity.
Funder
Science Challenge Project
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering