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Title:
CLOSED FORGING APPARATUS
Document Type and Number:
Japanese Patent JP2009106953
Kind Code:
A
Abstract:

To provide a closed forging apparatus capable of obtaining a desired closed state without breaking a die.

In a first die, a first uneven concavo-convex part is formed on the outer peripheral surface of a fixed die. In a second die, a second uneven concavo-convex part is formed on the outer peripheral surface of a movable die. On the outer peripheral side of the second die, an engagement mechanism including a plurality of split pieces and a case for holding the split pieces on the inner peripheral side is disposed. The case has a tapered shape such that the inner peripheral surface becomes smaller in diameter from the movable die to the fixed die. The split piece has a tapered shape such that the outer peripheral surface becomes smaller in diameter from the movable die to the fixed die. On the inner peripheral surface, a plurality of piece concavo-convex parts fitted in the concavo-convex parts of the first and second dies. At least one convex part fitted in the concavo part of the second die of the piece concavo-convex part is a come-off prevention means projecting toward the inside of the other convex part. The second die and the split piece are disposed in a state not to be parted, the split piece is moved along the inner peripheral surface of the case, and the concavo-convex parts of the split pieces are fitted in the concavo-convex parts of the first and second concavo-convex parts.


Inventors:
Matsui, Yasuzumi
Application Number:
JP2007000280281
Publication Date:
May 21, 2009
Filing Date:
October 29, 2007
Export Citation:
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Assignee:
MUSASHI SEIMITSU IND CO LTD
International Classes:
B21J13/03; B21J5/02
Domestic Patent References:
JP2002224787A