Abstract
A knowledge of the amount of friction present at the die/ workpiece interface and the basic yield characteristics of a workpiece material are fundamental requirements for any metal-forming analysis to have a useful practical application Coincidentally the property of a ring under compression provides a reliable means of sensing and measuring friction and of determining the basic yield characteristic of the workpiece material under bulk plastic deformation.
However, the application of the ring technique requires measurement of axial as well as diametral displacements which - for ease of application and saving on material — should be made continuously, especially for high temperature application.
Towards taking maximum advantage of the ring technique, this work presents a design of a special diametral displacement transducer consisting of four cylindrical variable area capacitors for continuous measurement of external diametral displacement of a ring under compression. The transducer, capable of automatically recording the mean of two orthogonal diametral displacements was used at elevated temperature.
Get full access to this article
View all access options for this article.