Study of Ultrasonic Machining:Contact Angle, Machining Load and Penetrating Depth

概要

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Expressions of contact angle between tool and work surface, of impulsive load in machining and of penetrating depth of abrasive particles into the work surface were given from the analysis previously presented. By using experimental data the above mentioned factors are given numerically and also their correct relationship with the rate of material removal influenced by the variables involved in the machining process is obtained. The conclusions are as follows :<BR>(1) The contact angle, which is an important factor to decide impulsive speed, usually has the value from 30° to 180° and the suitable value corresponding to the suitable static pressure lies between 70° and 130°.<BR>(2) Machining load consists of damping mechanical resistance and restoring stiffness, and they must be considered separately in contact time and in noncontact time. The way of vibration depends on the state of four elements of machining load above mentioned. But the machining rate has little relationship with these factors.<BR>(3) Penetrating depth of abrasive particles into the work surface has close relationship with machining rate. From this fact it can be explained why machining rate depends on the kind of works and the size of abrasive particles and why the most suitable static pressure on machining rate exists.
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