M.S. Thesis Presentation by David Bell
Thursday, September 3, 1998

"A Predictive Model For the Concentration of Cutting Fluid That Escapes the Cutting Zone When Turning A Circular Cylinder On A Lathe"

Abstract

The use of cutting fluids has raised increasing concerns with regards to environmental intrusiveness and occupational hazards. It often produces mists, smoke, gases and other particles that are incompatible with the shop floor environment. Current NIOSH requirements for the cutting fluid concentration in a manufacturing environment is set at 0.5 mg/m3 total particulate as a permissible exposure level for personnel. To determine this concentration, current practice uses personal monitoring devices to detect particulate while machining takes place.

The goal of this study was to provide a methodology for predicting the concentration of cutting fluid that leaves the cutting zone when turning a circular cylinder on a horizontal lathe. A parametric model that relates the amount of cutting fluid escaping into the environment to fluid properties, part dimension, and machining parameters will be presented. The mechanisms that contribute to the loss of fluid that will be discussed include the evaporation of fluid due to high cutting temperature, spin-off of fluid from the workpiece due to rotational motion, and the splash due to the kinetic energy by fluid-workpiece impact.