WITHDRAWN: Optimization of Modular Fixture Layout by Minimizing Work-piece Deformation

Abstract

Machining fixtures are utilized to locate and restrain a workpiece during different manufacturing processes. The workpiece must be properly located and clamped in order to have it to be manufactured according to the prescribed dimensions and tolerance. The real motive of fixture design is to maximize locating accuracy and workpiece firmness while minimizing deformations. The purpose of this research work is to conduct a multi-objective optimization in order to minimize workpiece deflections due to clamping forces and optimized fixture layout by taking into consideration the boundary conditions and loads applied during a machining process. The locators are employed in a 3-2-1 fixture configuration. Then the empirical relations are used to calculate the machining forces and moments generated during drilling and milling processes and after that the workpiece is loaded to model those cutting forces. ANSYS parametric design language (APDL) code which made use of sub-approximation method is utilized to automatically optimize locator and clamp positions. Afterwards the clamping forces are being optimized using balancing force-moment method. Lastly, the maximum deformation of the workpiece against the optimum clamping forces is found by harmonic analysis.

Improved design of railway wagon underframe flipping machine

“…However, the current flipping machine sometimes has the danger of the underframe slipping when the underframe is flipped to around 90°. In addition, the excessive thrust of the hydraulic cylinder causes the underframe and clamping mechanism to deform greatly in some areas during the flipping process [4]. The above problems result in the poor stability of the current flipping machine, which has a serious impact on production efficiency.…”