A novel piezo-actuated compliant mechanism is developed to obtain triaxial translational motions with decoupled features for nanocutting. Analytical modeling of the working performance followed by Pareto-based multiobjective optimization conducted determining dimensions mechanism. Finite element analysis on designed verifies accuracy model, accordingly demonstrating effectiveness optimal design process. Open-loop test prototype shows that proper strokes low coupling and high natural...

Fast/slow tool servo (FTS/STS) diamond turning is a very promising technique for the generation of micro-lens array (MLA). However, it still challenge to process MLA in large scale due certain inherent limitations this technique. In present study, novel ultra-precision cutting method, as end-fly-cutting-servo (EFCS) system, adopted and investigated large-scale MLA. After detailed discussion characteristic advantages processing MLA, optimal toolpath strategy EFCS developed with consideration...

This paper presents a novel two-dimensional vibration-assisted compliant cutting system (2-D VCCS) to be used on conventional machines for generating textured surfaces with uniform and accurate topography. The proposed is specifically designed capable of delivering high-amplitude vibrations decoupled guidance at the tool tip, while keeping high resistance forces during texturing process. matrix-based compliance modeling method adopted dynamic 2-D VCCS. With optimized structural parameters,...

This paper presents the methodology for design and control of a high-stiffness fast tool servo (FTS) system practical application in diamond machining freeform surfaces. The electromechanical model FTS is established by combining piezoelectric actuator flexure hinge mechanism formulation methodology. In order to accommodate nonlinearity, cutting force disturbances as well realize accurate tracking designated path required surfaces, novel adaptive terminal sliding mode (NATS) strategy capable...

This article reports on the mechanism design, dimension optimization, closed-loop control, and practical application of a piezoelectrically actuated fast tool servo (FTS) for diamond turning microstructured surfaces. With mechanism, finite-element based analytical model is developed to theoretically relate working performance with its structural dimensions. Considering micro/nanocutting, dimensions are deliberately determined through evolutionarily optimizing comprehensive objective. To...

In the newly proposed rotary spatial vibration (RSV)-assisted diamond cutting system, a piezoelectrically actuated monolithic compliant vibrator (CSV), generating three decoupled translational vibrations with high working bandwidth, is deliberately designed to work on rotating spindle of machine. Using matrix-based compliance modeling method and Lagrangian principle, complete system dynamics models CSV are formulated. The analytical results further validated by comparison obtained through...

Fast tool servo/ slow servo (FTS/STS) diamond turning is a very promising technique for the generation of freeform optics. However, currently adopted constant scheme azimuth sampling and side-feeding motion possesses no adaptation to surface shape variation, leading non-uniform quality low machining efficiency. To overcome this defect, paper reports on novel adaptive (ATS) which essentially based two-degree-of-freedom (2-DOF) FTS/STS. In ATS, interval are actively controlled at any cutting...

High-bandwidth and long-range nanoprecision motion is crucially required by many advanced instruments robotic systems, which rely on the nanopositioners. However, traditional nanopositioners suffer from their fixed stiffness can only obtain performance, leading to narrow applications. Here, a novel nanopositioner called normal-stressed electromagnetic-driven stiffness-tunable (EDSTN) presented, consists of three parts: A electromagnetic actuator generate actuation force, high-stiffness...

Abstract The position-dependent feature in current vat photopolymerization-based additive manufacturing leads to challenges controlling the dimensional accuracy of printed components. To overcome this intrinsic limitation, we propose a time-dependent dynamic laser writing (DLW) approach for precise volumetric printing complex-shaped lenses. In DLW-based printing, formed surface is generated by accumulating material growth functions (MGFs) on scanning path, where MGF created direct...

In this paper, a novel pseudo-random diamond turning (PRDT) method is proposed for the fabrication of freeform optics with scattering homogenization by means actively eliminating inherent periodicity residual tool marks. The strategy accurately determining spiral toolpath vibration modulation deliberately explained. Spatial geometric calculation employed to determine in consideration cutting geometries, and an iteration algorithm further introduced enhance computation efficiency. Moreover,...

This paper reports on the development of a piezo-actuated nanometric ultra-fast tool servo (NU-FTS) for nanocutting. For motion guidance, flexure mechanism is especially designed using novel kind generalized hinges with notch profiles described by rational Bezier curve. Both kinematics and dynamics properties are comprehensively modeled through finite beam modeling method. With this model, hinge divided into set serially connected beams constant cross sections. The equivalent stiffness...