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1. 发明专利

JP2006346704A METHOD FOR MANUFACTURING NUT 审中-公开
公开(公告)号：JP2006346704A
公开(公告)日：2006-12-28
申请号：JP2005175062
申请日：2005-06-15
申请人： KATO SEISAKUSHO KK
发明人： KATO HIROYASU
IPC分类号： B21K1/64 , F16B37/02
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a nut, by which the nut can be manufactured from a metallic material having a thickness thinner than the length of a female screw, and can suppress an unnecessary waste of a material. SOLUTION: The method for manufacturing the nut comprises thickness increasing steps (a) to (c) for increasing the thickness of a metallic material 10 around a through-hole 11 formed therein by enlarging the diameter of the through-hole 11 by press work, and a female screw forming step for forming a female screw on the inside peripheral surface of the through-hole 11 enlarged in the thickness increasing steps. In the thickness increasing steps, the outside peripheral surface of the metallic material 10 is bound by means of a press die so as not to deform the outside peripheral shape of the metallic material 10. Further, in the thickness increasing steps, the portion around the through-hole 11 in one surface (a punch side surface 13) of the metallic material 10 is heaved by press work, and the other surface (a die side surface 12) of the metallic material 10 is restrained by means of the press die so as to become a flat surface. COPYRIGHT: (C)2007,JPO&INPIT

2. 发明专利

JP2006346703A PRESS WORKING METHOD 审中-公开
公开(公告)号：JP2006346703A
公开(公告)日：2006-12-28
申请号：JP2005175061
申请日：2005-06-15
申请人： KATO SEISAKUSHO KK
发明人： KATO HIROYASU
IPC分类号： B21J5/02 , B21D22/02
摘要： PROBLEM TO BE SOLVED: To provide a press working method by which a member having a shape having a projecting part having satisfactory height is accurately formed from a thin flat plate-shaped metallic base stock. SOLUTION: This method is provided with protruding stages (a)-(c) where the thickness in the outside portion is thinned and also the inside portion is protruded by making the material in the portion where the thickness is thinned thickness flow and projecting part forming stages (c), (d) where the projecting part 23 having a prescribed height is formed by pressurizing the portion where is protruded in the protruding stages by press working. The protruding stages have a plurality of press-working stage for successively reducing the outside diameter in the inward protruded part and successively raising the height of the protruded portion. Furthermore, the method is provided with a drawing stage for forming a cup-shaped member which has a shape having a tube part, a bottom part and a projecting part projected from the inside of the bottom part by drawing the thinned thickness portion in the surrounding of the projecting part formed in the projecting part forming stages. COPYRIGHT: (C)2007,JPO&INPIT

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