Vibration Drill (I)

Abstract

Vibration drill is an apparatus which wages drilling by a vibrant tool. The tool is disposed to be a part of the mass which turns a vibrator and the main part of the mass is provided with a rotor which is able to do a torsional vibration of sinusoidal type by the action of a stator of special windings when it is supplied with a constant alternating current. The restitutive moment of this torsional vibration system of the drill is given by four piano rods of the same length. The paper treats the theoretical analyses of the motion of the vibrant tool in its working state, and moreover confirms the reasonableness of these analyses by comparing with the experimental results. Both of static and dynamic characteristics of the drill are pursued to see that it has sufficient functions and adequate performances as a dynamic drill. Assuming that the material of the work during the operation of the vibrant tool may turn uniformly a certain yield state of pressure, the drilling mechanism of the drill is studied by an analytical method to obtain a good solution for clarifying the experimental facts of the vibration drilling.