Investigations on Peen Forming : 1st Report, On the basic features of this process

概要

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Peen forming has been utilized in the special field of the airplane industry. The authors conceive independently the principle of this process and intend to develop this as a general forming process of sheet metals. Suitable selection of peening conditions such as the diameter or the velocity of a shot enables bulging of a disc and bending of a strip. Successful conditions in these formings depend on the peening energy of a grain of shot and there exist a lower and an upper limit of the energy. When the upper limit is exceeded, the disc sinks and the strip bends in the opposite direction. So, the intended forming cannot be attained. Peening brings about a strengthening through work-handening and a roughening of the products. This process is applied successfully to strong brittle materials which are difficult to form because it has a feature of forming under compressive stresses.
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