Design and Analysis of Multi-Point System for Forming Three Dimensional Free-Form Surfaces
Multi-point Sheet metal forming is a flexible technique in which a discrete punches are used to generate the continuous 3-D surface . The proposed die comprises a set of matrices of a closely stacked discrete punches arranged to form a cavity in which a free form surface can be formed .The working surface of the multi-point die are modeled by a uniform B-spline and constructed by adjusting the height of each punch manually. Finite element simulation for the process was performed to study the effect of punch number on the shape error and thickness variation. Experimental work include the building of multi-point die to form the aluminum sheets. The effect using rubber interpolators on dimpling defect were also studied . The results revealed that thickness variation error between the numerical and experimental results is equal to 5% .
Prof. Adrian Olaru
A. K. J. Kadhim and R. A. Neama, "Design and Analysis of Multi-Point System for Forming Three Dimensional Free-Form Surfaces", Applied Mechanics and Materials, Vol. 841, pp. 9-14, 2016