Abstract
To address the problem of debris accumulation in small-hole electrical discharge machine (EDM) and simplify the design of the spindle head, the paper proposes a novel composite motion design procedure integrated high frequency vibration and large stroke feed using one voice coil motor (VCM). Particularly, for the purposes of high servo accuracy and high frequency response of the composite motion, an improved zero-phase-error tracking controller (ZPETC) algorithm decoupled with the feedback controller is developed for the process control, in which the feedback parameter adjustment is very simple to reduce the computation complexity. At last, the proposed procedure is validated by the experimental study of the established VCM positioning table; the results verify the efficiency of the proposed method.
Highlights
Derived from normal electrical discharge machine (EDM), micro-EDM is one of the most widely used micro manufacturing techniques; it does not make direct contact between the electrode and the workpiece, eliminating mechanical stresses and chatter problems during machining [1, 2]
Shock and Vibration the existing processing form; large stroke feeding process and high frequency vibration of the tool electrode are driven by one voice coil motor (VCM); the composited motion design procedure makes the mechanical structure possible to be utilized in the vibration assisted small-hole EDM
The novelty of the work is proposing a composite motion design procedure using one VCM for vibration assisted small-hole EDM and developing an improved zero-phase-error tracking controller (ZPETC) method which offer an effective control strategy for the process control; the efficiency of the composite motion procedure is validated through experimental study of the established VCM positioning table
Summary
Derived from normal EDM, micro-EDM is one of the most widely used micro manufacturing techniques; it does not make direct contact between the electrode and the workpiece, eliminating mechanical stresses and chatter problems during machining [1, 2]. Shock and Vibration the existing processing form; large stroke feeding process and high frequency vibration of the tool electrode are driven by one VCM; the composited motion design procedure makes the mechanical structure possible to be utilized in the vibration assisted small-hole EDM. How to regulate the ZPECT parameters becomes a practical problem To overcome this challenge, an improved ZPETC decoupled with the feedback controller for small-hole EDM process is developed in the composite motion design procedure. The novelty of the work is proposing a composite motion design procedure using one VCM for vibration assisted small-hole EDM and developing an improved ZPETC method which offer an effective control strategy for the process control; the efficiency of the composite motion procedure is validated through experimental study of the established VCM positioning table.
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