Toyo Seikan Kaisha, Ltd.

Toyo Kohan Co., Ltd.

Toyo Seikan Group Holdings, Ltd.

Hidekazu Tomaru

Norihito Saiki

Toshiki Okuda

Etsuro Tsutsumi

Shinichi Taya

Hayato Fukumoto

Junichi Tanabe

Masahiro Kai

Mitsuhiko Aoyagi

Nobuhisa Okabe

Hiromitsu Funatsuki

Hironori Oonishi

Susumu Sakamoto

Syouta Tanaka

The present invention provides a deep-drawing method and a forming die therefor which can prevent the occurrence of cup side wall wrinkles and the collapse of the bottom during the process of deep-drawing a blank and which can increase the drawing ratio. A wrinkle pressing surface of a pressure pad () or an upper surface of a draw die () includes a flat inner edge surface (), a tapered surface () which becomes deeper as the surface advances from the flat inner edge surface toward an outer circumference, a deepest flat surface (), and a flat outer edge surface (), which are provided in that order from an inner edge through which a draw punch passes toward an outer edge.

Deep-drawing method and forming die therefor

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 method of drawing and ironing a resin film laminated metal sheet for forming a can body having a bottom portion, a can wall portion and a flange-forming portion by drawing the resin film laminated metal sheet obtained by laminating at least one surface of a metal sheet with an organic resin film, followed by ironing by using a punch and a plurality of dies neighboring each other. The can wall is effectively prevented from being broken by a decrease in the thickness of the can wall, and drawn and ironed cans are efficiently formed having a thickness which is decreased as designed.

Method of drawing and ironing a resin film laminated metal sheet and resin film laminated drawn and ironed can using the same method

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.

Stripper device for can drawing and ironing apparatus

A method and a device for manufacturing a synthetic resin coated metal can body capable of drawing and ironing the synthetic resin coated metal can body with a large processing quantity without causing can body breakage. First and second ironings are conducted to the side wall of a redrawn can () formed by drawing a thermoplastic resin-coated aluminum sheet () on both surfaces by a first ironing die () and a second ironing die () in that order according to the pressing-in of a punch () with such processing quantities that sheet thickness reduction ratios from an original sheet thickness come within the rages of 35 to 55% and 60 to 75% respectively for manufacturing a metal can body. Since the coated layer of a thermoplastic resin acts on a metal body in a direction for preventing the metal body from being broken (ruptured), processing conditions for ironing are relieved, and even if an ironing with a high sheet thickness reduction ratio is performed, an ironing capable of maintaining quality is allowed without causing the can body breakage in a first step can () and a second step can ().

Method and device for manufacturing synthetic resin coated metal can body

Growing community of inventors

Yokohama, Japan

Hidekazu Tomaru