Open Access

ARTICLE

Analysis and Experiment on Incremental Forming Process for the Spiral Plate of Continuous Screw Conveyer

by S. Gao¹, K. Nakasa², K. Nogi³, L. Huang⁴

1 Iwaki Meisei University, Iwaki, Fukushima, Japan
2 Hiroshima Kokusai Gakuin University, Aki, Hiroshima, Japan
3 Worm Japan Co. Ltd., Iwaki, Fukushima, Japan
4 AUT, School of Engineering Reception, Auckland Central, New Zealand

Computers, Materials & Continua 2011, 22(1), 39-54. https://doi.org/10.3970/cmc.2011.022.039

Abstract

An incremental press-forming method was newly developed for the fabrication of spiral plates of a continuous screw conveyer, boring screw, screw pump and so on. In this method, a pair of V-shaped punches and dies with two opposite inclined edges are used instead of punch and die with spiral surfaces. The experiments on incremental forming were carried out on aluminum alloy and steel disks with a hole and a slit, and the deformation process of the plate during and after the press-forming was simulated by a finite element method (FEM). The press-forming shows that the spiral plate has a correct shape and smooth surface, i. e. the gradient of the surface along the internal, central, and external spiral curves of the deformed disk is constant. In addition, the spiral pitch and the amount of spring back obtained by the FEM simulation agree well with the experimental values for the different die or punch angles, the disk thicknesses and the disk materials. The FEM calculation also indicates that the equivalent stress during the press forming as well as the residual stress after the spring back takes a maximum value at an internal diameter position where the die or punch makes first contact to the disk.

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