Affiliation:
1. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China
Abstract
Aims:
An inverted XY-3-RPS hybrid mechanism was designed to apply ultraviolet-induced
nano-particle colloid jet machining to polish the complex surface.
Background:
The hybrid mechanism has been widely used in the ultra-precision polishing field for installing
different polishing tools on the moving platform to meet different machining requirements because
of its wide working space, good dynamic performance and large bearing capacity.
Objective:
The main objective of this study is to establish an inverted XY-3-RPS hybrid mechanism for
UV-induced nanoparticle colloid jet machining, to realize the ultra-precision polishing of complex surfaces
by UV-induced nanoparticle colloid jet machining.
Methods:
The three-dimensional model of the inverted XY-3-RPS hybrid mechanism was established,
and the kinematics and dynamics were analyzed. The Jacobian velocity matrix of the inverted XY-3-
RPS hybrid mechanism is derived by vector construction and differential methods, and the dexterity index
under different proportional parameters is optimized and simulated. The output Jacobian matrix and
stiffness matrix are obtained using the virtual work principle, and their static analysis is carried out.
Based on Lagrange dynamics theory, the dynamic mathematical model of the inverted XY-3-RPS hybrid
mechanism is established, and its kinematics is verified by software joint simulation. Through dynamic
simulation, the variation curves of motion, force and kinetic energy of the mechanism are obtained,
which provides a theoretical basis for applying the hybrid mechanism in complex curved surface
polishing.
Results:
The analysis shows that it has the best dexterity index when the ratio of moving and the fixed
platform is 2:1. The kinematic simulation results show that the hybrid mechanism moves reliably under
the given trajectory. The dynamic simulation results show that the force analysis of each kinematic pair
and the kinetic energy change curve of each part changes smoothly, and the dynamic performance is
stable under different trajectories.
Conclusion:
The parameter design and structural design of the inverted XY-3-RPS hybrid mechanism
meet the requirements of ultra-precision polishing of complex surfaces.
Funder
National Natural Science Foundation of China
Publisher
Bentham Science Publishers Ltd.
Subject
General Materials Science