Large circular forgings for jet-engines have been produced by press or hammer involving many heatings. However, such production equipment is usually required to have a forging capacity above 10,000 tf, and the products qualities and material yields leave room for improvement. In order to solve the above problems, a rotary forging process was introduced into the working of Ti alloy materials. Prior to actual trial production, on model tests (1/8.8 scale) the design of the process and profiles were carried out using lead and Ti-6 Al-4 V. According to a 10 inclining upper die of an actual press, temperature drop of the material surface in contact with the rotary dies decreased, and actual cup-shape engine disks (715 x 280 h) were successfully formed without cracks, underfilling or other problems. These samples had thin alpha-casings (nearly 0.15 mm) and high material yields (nearly 70 %), and showed as good and homogeneous mechanical properties as those produced by the conventional forging process.
Rotary forging of Ti alloy products for airplane engine
Drehschmieden von Ti-Legierungsprodukten fuer Flugzeugmotor
Titel japanisch
Sumitomo Metals (Sumitomo Kinzoku) ; 41 , 1 ; 27-Wit
1989
10 Seiten
Article (Journal)
Japanese
French rotary airplane engine uses a variable stroke
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