Title:
中空なラックバーの製造方法および装置
Document Type and Number:
Japanese Patent JP3995182
Kind Code:
B2
Abstract:
In production of hollowed rack bars from steel tubes (3) for use in steering equipment for automobiles and so on, a part of length of the steel tube to be processed and its adjacent parts is held in split dies (5, 6) encircling a whole circumference of the tube except for the dies having a hole coinciding with the part of the tube to be processed. Then, a punch (9) is inserted into the hole at a state of the dies closed for flattening the part of the tube, and then mandrels are pushed into an inside of the tube for ironing from the inside to form a rack pattern, at a state of a rack forming die being inserted into the hole and held in contact with the flattened part of the tube (Fig.1).
Inventors:
Kazutomi Oka
Tetsuichi Fukuhara
Tetsuichi Fukuhara
Application Number:
JP37008699A
Publication Date:
October 24, 2007
Filing Date:
December 27, 1999
Export Citation:
Assignee:
Neturen Co., Ltd.
International Classes:
B21K1/76; B62D3/12; B21D17/02; B21D22/02; B21D51/16; B21D53/84; B21K1/12
Domestic Patent References:
| JP10296373A | ||||
| JP6246379A | ||||
| JP60221143A | ||||
| JP9175412A |
Attorney, Agent or Firm:
Yasuhiro Hagiwara