Micropositioning in the Turning Process Via Magnetostrictive Actuation
 
 

William L. Kanizar | MS | 1996

ABSTRACT:

Turning is one of the most common processes used in industry. Any part with a cross section that is circular, and some that are non-circular, can be turned. The surface finish of a turned part is primarily generated from process parameters such as feed, tool geometry, and cutting speed: however process vibrationscan have deleterious impact on surface quality. Process variables (feed, speed, etc.) are often selected to provide high quality, often at the sacrifice of productivity.

The focus of this work is the development of micropositioners that can be used to actively control the turning process. Two systems are studied, the first system being a one degree of freedom system that actively controls the tool position in the radial direction. A magnetostrictive actuator, using Terfenol-D, is used to provide the motion. Two controllers are developed separately: a PID controller for positional control for noncircular cutting, and a rate feedback controller for vibration abatement. cutting experiments are used to verify the systems ability to interact with the turning process.

The other system consists of two magnetostrictive actuators thta are in the feed and radial direction. The system is modeled and simulations are conducted. The ability to control two directions simultaneously is demonstrated through the use of an open loop controller. The model adequacy is verified through experimentation.

If you have any comments or suggestions please e-mail jwsuther@mtu.edu.