Title:
METHOD FOR MANUFACTURING DEFORMED STEEL BAR AND LEAD FRAME
Document Type and Number:
Japanese Patent JP3798299
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve forming accuracy of a deformed steel bar by preventing the generation of burrs and uneven wall thickness at the time of blanking and to curtail manufacturing costs at the same time.
SOLUTION: A metallic plate bar stock 2 having a fixed thickness made of copper alloy whose softening temperature is 250°C to 600°C is fed for rolling by pinching the metallic plate bar stock 2 with a die 1 and a roll 4, by which a thick thickness section 14 and a thin thickness 12 section are formed and the deformed steel bar 12 is obtained. No annealing is performed and a product of the deformed steel bar is obtained.
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| JPH0199701 | METHOD FOR ROUGH ROLLING H SHAPE |
Inventors:
Tomiie Masayuki
Sukumo Shun Shun Green
Toshio Hirabayashi
Sukumo Shun Shun Green
Toshio Hirabayashi
Application Number:
JP2001338524A
Publication Date:
July 19, 2006
Filing Date:
November 02, 2001
Export Citation:
Assignee:
Mitsubishi Shindoh Co., Ltd.
International Classes:
B21B1/08; B21B3/00; B21B13/18; B21H8/00; C22C9/00; C22C9/02; H01L23/48; (IPC1-7): B21B1/08; B21B3/00; B21B13/18; B21H8/00; H01L23/48; //C22C9/00; C22C9/02
Domestic Patent References:
| JP8174128A | ||||
| JP1133603A | ||||
| JP3243737A | ||||
| JP11080862A | ||||
| JP1309219A | ||||
| JP7018353A | ||||
| JP2000317523A |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama