Sheet Metal Die Forming Using Closed-Loop Shape Control
1982; Elsevier BV; Volume: 31; Issue: 1 Linguagem: Inglês
10.1016/s0007-8506(07)63290-9
ISSN1726-0604
AutoresDavid E. Hardt, R. D. G. Webb, N.P. Suh,
Tópico(s)Laser and Thermal Forming Techniques
ResumoThe shape of compound curvature sheet metal parts is determined primarily by the geometry of forming dies and secondarily by interfacial and other forming environment conditions. Consequently the die geometry design step is critical to successful part manufacture. Existing analytical techniques do not permit sufficiently accurate prediction of die shape because of the inherent complexity of the three dimensional plasticity problem, the difficulty of characterizing interface forces and the need to continuously recalibrate the model as material properties vary. In this paper the use of a variable configuration, discrete element die in a closed-loop shape control system is proposed as a solution to this problem. The system forms a workpiece by an iterative procedure involving forming, measuring, and die shape change until shape convergence occurs. A critical experiment was performed on such a system that confirmed the validity of this concept.
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