METHOD FOR MULTI-STATGE MOLDING OF DEEP-DRAWN STEEL SQUARE CAN; DEEP-DRAWN STEEL SQUARE CAN

• Main Authors: NOBA KAZUNORI, YAMADA TERUAKI, YOSHIDA TORU, KOINO MICHIHIRO, KAWAI MASATAKA, ISOGAI EIJI
• Format: Patent
• Language: English
• Published: 24.03.2011
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PROBLEM TO BE SOLVED: To provide a method for multi-stage molding of a deep-drawn steel can having excellent surface property and to provide a deep-drawn steel can. SOLUTION: The method for multi-stage molding does not substantially include an ironing step in all the drawing steps other than at least the final drawing step after a first drawing step, wherein the maximum value ΔHmax of an increment of the height of a drawn can at every position from the long side of the drawn can to the short side thereof is set at ≤40% in a second drawing step and a variation width of ΔH at every position is ≤20%, and a shape of a blank 10, a contour 2 of a punch per drawing step and a contour 1 of a dice are set so that ΔHmax is ≤25% and the variation width is ≤15% in all the drawing steps after the third drawing step. Thus, drawing is conducted without ironing processing. COPYRIGHT: (C)2011,JPO&INPIT