Title:
【発明の名称】熱交換器用フィンの金型装置
Document Type and Number:
Japanese Patent JP2790999
Kind Code:
B2
Abstract:
The die set manufactures a heat exchanging fin by the steps of: forming a projected section in a thin metal plate; drawing the projected section, once or a plurality of times, to reduce the diameter thereof and to form the projected section into a cylindrical section; and piercing and barring the cylindrical section to form into a collar section through which a heat exchanging pipe is pierced. The die set comprises: a lower die; an upper die having a die hole whose diameter is shorter than the bottom diameter of the projected section not drawn; a punch being provided in the lower die; and a lifter being provided in the lower die, the lifter being biased toward the upper die by elastic means, the lifter having a through-hole through which the punch passes and an accommodating space for accommodating a slackened section of the projected section, which is formed in the vicinity of a base thereof while drawing the projected section.
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Inventors:
YAMADA MAMORU
Application Number:
JP8502096A
Publication Date:
August 27, 1998
Filing Date:
April 08, 1996
Export Citation:
Assignee:
HIDAKA SEIKI KK
International Classes:
B21D19/08; B21D24/00; B21D24/04; B21D35/00; B21D53/04; F28F1/32; B21D53/08; (IPC1-7): B21D53/08; B21D19/08; B21D24/00; B21D24/04; F28F1/32
Domestic Patent References:
| JP50153386A | ||||
| JP4123828A |
Attorney, Agent or Firm:
Takao Watanuki (1 outside)