CUTTING TEMPERATURES OF CERAMIC TOOLS

CASE STUDY

VICKRAM.M

AIM OF THE CASE STUDY • AIM: The aim of this case study is to carry out

investigation into different factors which influence temperature distribution in ceramic tools.

CERAMIC MATERIALS INVESTIGATED: 1.AL2O3-TIC 2.case hardened AISI steel 3.nickel based super alloys (eg.inconel 718) SOFTWARE USED: Finite Element Pro(algor) is the software used

here for calculating temperature distribution.

STEPS INVOLVED &

EXPERIMENTS TO BE DONE

STEPS INVOLVED: 1.Temperature measurements of the tool rake face were

performed using a thermocouple based technique and 2.The obtained results are compared with finite element

analysis

EXPERIMENTS TO BE DONE:

Experiments were performed to study the effects of 1.Cutting parameters 2.Different tool geometries 3.Tool conditions and 4.Work piece materials on cutting edge temperatures.

RESULTS

1.It was found that there is an optimum value of rake angle where the cutting edge temperature was minimum.

2. Initialy the edge temperature reduced with a more negative rake angle from -6 degree to-20 degree to more negative values, temperatures would be increased again.

COMPARISON OF CUTTING DIRECTION STRESS(Mpa) WITH BAGCHI AND WRIGHT’S EXPERIMENT

ANALYTICAL RESULTS IN WORK PIECE

EL- WARDANY’S EXPLANATION• At -6 degree rake angle the air gap between the

tool’s clearance face and the cut surface is relatively small.

• Moving from -6 degree to -20 degree rake angle the tool gets rotated or lifted up away from the surface

• Then there is a great chance of cooling by convection • Eventualy the shearing of the material in the

secondary shear zone gets to be intense with more aggressively negative rake angles.

• Then the overall heat generated is larger and temperatures rise again.