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For manufacturing twisted products, we proposed a new extrusion process using stepwise assembled dies that are divided the radial direction of billet. In this study, we tried to apply the proposed extrusion process to the production of a hollow shaft with a helical tooth on the outside/inside. Furthermore, we built an extrusion system whose various processing conditions are controlled by a personal computer. The fundamental characteristics are investigated by carrying out an extrusion test using a colour clay on a hollow shaft with a helical tooth produced by the proposed process. The twist depends on the flow angle of the material of the die aperture. The method successfully produces a tooth whose twist continuously changes in the extrusion direction of the extrusion system. These results show that the proposed extrusion process is effective in producing twisted products.

Development of Flexible Extrusion Process with Divided Diesfor Producing Hollow Shaft with Helical Tooth