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machining fixture for adaptive CNC machining process of near-net-shaped jet engine blade

Chinese Journal of Aeronautics 2020年第4期33卷 1311-1328页

作者： Dongbo WU Hui WANG Jinsong PENG Kaiyao ZHANG Jie YU Xuesong ZHENG Yunhai CHEN State Key Laboratory of Tribology Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and ControlDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China Yantai University Yantai 264005China AECC Xi’an Aero-engine LTD Xi'an 710021China BEIJING POLYTECHNIC Beijing 100176China

Low stiffness and positioning problems are difficulties and challenges in the precise machining of near-net-shaped *** paper aims to achieve high accuracy in manufacturing by fixture-and deformation-control in the adaptive CNC machining *** CNC machining technology is first analyzed,and new fixture-evaluation criteria and methods to evaluate the adaptive CNC machining process fixture design are ***,a machining fixture is designed and manufactured after analyzing its positioning scheme,clamping scheme,materials(PEEK-GF30),and structure ***,the designed fixture is analyzed by FEA and experimentally verified by a cutting *** results show that the deformation of the blade is an overall rigid-body displacement,the main deformation of the blade-fixture system occurs on the four clamping heads,and this fixture can effectively protect the blade from local *** proposed clamping-sequence method reliably and effectively controls the local maximum deformation of the *** system stiffness is increased by 20 Hz,with each clamping force increased by 200 *** high-and low-frequency displacement in roughing milling or finishing milling are acceptable relative to the accuracy demand of blade *** fixture and an adaptive CNC machining process can achieve high accuracy in blade manufacturing.

关键词： Adaptive CNC machining process Clamping force Clamping sequence fixture displacement response machining fixture Near-net-shaped blade

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