Development of sacrificial support fixture using deflection analysis

International Conference on Recent Advances in Materials & Manufacturing Technologies

Ramteke, Ashwini M.^1 ; Ashtankar, Kishor M.^2

Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur

440010, India^1

Department of Mechanical Engineering, Visvesvaraya National Inst. of Technology, Nagpur

440010, India^2

关键词: Axis of rotation;    Clamping plates;    Cnc machining;    Customized parts;    Deflection analysis;    Fea analysis;    Fixture design;    Manufacturing time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/346/1/012072/pdf
DOI  :  10.1088/1757-899X/346/1/012072

来源: IOP

【 摘 要 】

Sacrificial support fixtures are the structures used to hold the part during machining while rotating the part about the fourth axis of CNC machining. In Four axis CNC machining part is held in a indexer which is rotated about the fourth axis of rotation. So using traditional fixturing devices to hold the part during machining such as jigs, v blocks and clamping plates needs a several set ups, manufacturing time which increase the cost associated with it. Since the part is rotated about the axis of rotation in four axis CNC machining so using traditional fixturing devices to hold the part while machining we need to reorient the fixture each time for particular orientation of part about the axis of rotation. So our proposed methodology of fixture design eliminates the cost associate with the complicated fixture design for customized parts which in turn reduces the time of manufacturing of the fixtures. But while designing the layout of the fixtures it is found out that the machining the part using four axis CNC machining the accurate machining of the part is directly proportional to the deflection produced in a part. So to machine an accurate part the deflection produced in a part should be minimum. We assume that the deflection produced in a part is a result of the deflection produced in a sacrificial support fixture while machining. So this paper provides the study of the deflection checking in a part machined using sacrificial support fixture by using FEA analysis.