Abstract
This paper deals analytically with improvement of the reduction effect of the transmissive force level on the hammering machine with the impact isolation anvil. In the case of light damping, drive frequency above a primary resonance of the hammer system and a long distant setting gap of the anvil head, the force from the hammer system gains in power more than that from the anvil system by increase of amplitude of the hammer's motion. Vibration interference is applied to improve of the reduction effect of the force level in addition to vibration isolation by means of the anvil mounted on an isolation spring. The two hammers are drived out of phase by the only one spindle. The twin type machine shows the efficient reduction effect in the above conditions in which the single type machine with the anvil is ineffective. Decrease of the reduction effect by disagreement of coefficient of restitution and mass of the work is small, but disagreement of the setting gap is influenced to some extent. The reduction effect was improved about 12 dB in experiment.
