Cavitation S Peening TM

Cavitation S Peening ^TM Japanese

Cavitation S Peening^TM is a peening method as follows;

・Shotless peening － Peening without shots

・Shock wave peening － Peening by using shock wave induced by cavitation bubble collapse

・Dr. H. Soyama et al. invents Cavitation S Peening^TM.

Cavitation normally causes severe damages in fluid machinery such as pumps, turbines, valves,

screw propellers, and so on. In case of Cavitation S Peening^TM, cavitation is controlled by using

a cavitating jet (see Fig.1). Impact force of shock wave induced by cavitation bubble collapse peen

surface of materials as same as shot peening, and then Cavitation S Peening^TM improves fatigue

strength of materials (see Fig.2). Advantages of Cavitation S Peening^TM are as follows;

・Shots are not necessary, i.e. Shotless peening.

・Peened surface is extremely smooth (see Fig.3).

・It is easy to peen bottom of gear teeth and/or narrow region.

・There is no thermal effect to material surface.

・Expensive plunger pumps are not required, since the impact force of cavitation bubble was used.

・It is easy to control the peening area.

REFERENCES

・H.Soyama, J.D.Park and M.Saka, Use of Cavitating Jet for Introducing Compressive Residual

Stress, Journal of Manufacturing Science and Engineering, Trans. ASME, Vol.122, No.1, 2000, pp.83 - 89.

・H.Soyama, Improvement in Fatigue Strength of Silicon Manganese Steel SUP7 by Using

a Cavitating Jet, JSME International Journal, Ser.A, Vol.43, No.2, 2000, pp.173 - 178.

・H.Soyama and M.Asahara, Improvement of the Corrosion Resistance of a Carbon Steel Surface

by a Cavitating Jet, Journal of Materials Science Letters, Vol.18, No.23, 1999, pp.1953 - 1955.