CUTTING FORCE DYNAMICS AS A TOOL FOR SURFACE PROFILE MONITORING IN AWJ

Abrasive waterjet cut surface is characterized using static and dynami c characterization techniques. A novel method of auto regressive movin g average model identification called model distance method is utilize d here for surface profile and dynamic force characterization. More in formation about the surface profile generating mechanism is derived th rough wavelength decomposition of the ARMA models. The dynamic workpie ce normal force in abrasive waterjet is influenced by process paramete rs such as fluctuations in water pressure, change in abrasive flow rat e, vibration of the positioning system, traverse speed, nozzle diamete r, etc. An attempt has been made in this paper to link the dynamics of the process to the quality of the generated surface. The feasibility of using the dynamic workpiece normal force as a parameter for on-line monitoring of the surface profile generated by abrasive waterjet is a lso investigated.