Hammering Machine based on Vibration with Collision (2nd Report)

Optimum Design Method

Abstract

This paper presents the design method with the optimum impact conditions on the machine. In the conditions, the optimum setting gap of an anvil and frequency ratio are selected for production of strong impact. There are two following problems about the design. The first is the design procedure for a new machine. Given values are impulse and repetitive impact frequency. It decides finally mass of the hammer, stiffness of the suspension spring, setting gap of the anvil and amplitude of drive by displacement. The other is the method of improving for a manufactured machine. The method includes the problem which should be decided the optimum driving frequency and should be get mass of a new hammer or stiffness of a new spring in the structurally restricted maximum hammer displacement. An elementary condition for high ratio of impulse and input power is small losses of friction in a hammer guide and a suspension spring. In the case of use of the optimum conditions which give the maximum impulse or the maximum total amount of impulse per second, O_m or O_m' point, special attention should be paid to decrease the friction loss.