Toyo Seikan Kaisha, Ltd.

Toshiki Okuda

Hidekazu Tomaru

Hayato Fukumoto

Syouta Tanaka

Hiromitsu Funatsuki

Susumu Sakamoto

A seamless can body in which the flatness of a center panel of a bottom of the thin can body can be stably maintained and the can body has high pressure resistance, high formability, and excellent properties for an internal pressure test. The seamless can body has a can bottom shape having a rim portion protruding to an outside of the can, an annular concave portion protruding to an inside of the can, and a flat center panel extending continuously from an inner peripheral side of the annular concave portion with a corner portion interposed therebetween. The curvature radius (R) of the corner section is in the range of 1.5 mm&#x3c;R&#x2266;6.0 mm, the depth of the annular concave section is from 1.5 mm to less than 3.0 mm, and the flatness (BSD) of the center panel is from &#x2212;0.15 to 0.15 mm.

Seamless can body

A stripper device for can drawing and ironing apparatus can remove a drawn and ironed can material from a punch without causing buckling (curl and wrinkle) on the material. Each finger () is split into three small fingers (), and an axial end of each small finger () is engaged with the lower part of a rocking arm () with an elastic member () in between. A head portion () of each rocking arm () is engaged with a cam portion () of a cam ring () to allow the finger () to be driven independently each other. Each rocking arm () is biased by an arm spring () in the direction of opening the small finger (), while the small finger () is biased by a finger spring () in the direction of its closure.

Growing community of inventors

Yokohama, Japan

Toshiki Okuda