Shock Isolation Type Hammering Machine with Elastically Suspended Anvil Characterizing by Repetitive Counterblow (3rd Report)

The Case of Two Independent Impact Followers

Abstract

This paper analytically deals with development of a hammering machine contained in function of shock isolation with a work operating manipulator. The isolation method is called “Elastic suspension with synchronously repetitive counterblow”. A body of the machine keeps to set rigidly and an anvil and a work holder are suspended elastically for shock isolation. An operating arm necessitates very low stiffness to the impact direction for isolation of impulsive force and high stiffness to the orthogonal direction for keep good moval responsibility. If the setting position of the arm takes place the position that the work contacts to the anvil head without press together and the ratio of the damped natural half period to the period of excitation is 2 to the anvil system and 2/5 to the work holding system, respectively, the hammer and the anvil collide to the work from upper and under direction as counterblow at the static equilibrium position of the work. Then change of the work thickness doesn't perturbed the counterblow. Feeling of the work operation becomes as good as that of the rigidly setting anvil. The mass ratio of the anvil and the work to the hammer take place more than about 15 and less than about 1 for control of reduction of the impact activity, respectively.