Toyota Boshoku Kabushiki Kaisha

Kouhei Ushida

Shirou Fujimura

Takuma Watanabe

A shear punching die assembly having first and second die units in which a material is punched to form a work while the material is clamped between the first and second die units is taught that preferably include a main punch contained in the first die unit and having a cross-sectional shape corresponding to a shape of the work, an ejector contained in the second die unit and positioned axially opposite to the main punch, an ejector biasing member normally biasing the ejector toward the main punch, an ejector retaining device that is capable of acting on the ejector when the first and second die units are in a closed condition, thereby retaining the ejector in a predetermined position, and an ejector releasing device that is capable of acting on the ejector retaining device when the first and second die units are opened over a desired distance, thereby releasing the ejector.

Shear punching die assemblies

Methods are taught for manufacturing a work having a peripheral flange by pressing a sheet material may include half die cutting the material so as to simultaneously form inner and outer circumferential surface of the peripheral flange while the peripheral flange is simultaneously subjected to isostatic pressures that are directed from the flange inner surface to the flange outer surface or from the flange outer surface to the flange inner surface.

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Toyota, Japan

Kouhei Ushida