In this paper, it is proposed how to calculate the metal surface property values during ultrasonic hammering, which has a lot of merits as the method of giving the plastic deformation of the metal surface, by the depth for the indentation and others in this working. Then the behaviours of the deformation of the metal surface during the hammering is examined.
The main results are as follows:
1. The surface stiffness and the rate of the elastic recovery can be calculated by the two arbitrary values from among those of the depth of the indentation, the contact time and the stationary load produced by the hammering on the metal surface with the vibrating tool.
2. The applicability of this calculating method is confirmed by the comparison between the calculated values of the depth of the indentation and the experimental results.
3. The depth of the indentation is affected by the repetition of the hammering on the same region of the surface. In the case of copper, the amount of the depth of the indentation increases a little by this repetition but in the case of S 15 C steel, hardly increases.
4. In the case of the low movement speed of hammering point, the nominal surface stiffness and the rate of the elastic recovery during working correspond with those given by the static and repeated indenting test.
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