Method for manufacturing a forging
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United States of America Patent
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-
Feb 14, 2017
Grant Date -
Jul 2, 2015
app pub date -
Oct 30, 2014
filing date -
May 22, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for manufacturing a forging includes forming a bi-material billet by enclosing a core material other than steel in a steel cylinder with a cylindrical wall and steel end caps. The cylindrical wall is heated. The method includes a first forging blow on the heated billet or on a disk-shaped rough forging forged from the heated billet with a first closed blocker die to produce a forging preform, and a second forging blow on the preform with a second closed blocker die to produce a netshape forging. An evacuation hole is formed in a steel shell of the netshape forging and the core material is removed from the netshape forging via the hole. At least 85 percent of the core material is in a liquid phase during the first and second forging blows, and removal of the core material.
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