Accession Number:

ADA242686

Title:

Self-Directed Control of End Milling

Descriptive Note:

Final rept. May 89-Oct 90,

Corporate Author:

NEW HAMPSHIRE UNIV DURHAM

Personal Author(s):

Report Date:

1991-11-01

Pagination or Media Count:

35.0

Abstract:

Self-directed control is a closed-loop control philosophy using qualitative techniques to achieve real-time generation of a process control cycle. One such instance of self-directed control is Qualitative Process Automation QPA. This report presents the results of applying QPA to the end milling machining process to maximize feed rates while avoiding the undesirable cutting events of excessive tool deflection, tooth overload and cutter shank overload. QPA is a real-time controller with its control output based on process events and not on temporal relationships as are classical machine tool control systems. Various procedures for detecting machining events with sensor data were investigated and used with QPA to develop a controller for the end milling process. The QPA controller used cutting force, spindle speed and feed rate data to predict and avoid excessive tool and tooth loads and to maintain part tolerance with the highest possible feed rate. Simulation cutting results, using an experimentally validated end milling model showed the QPA system to be successful in controlling and milling cuts for step changes in the radial and axial depths of cut on aluminum workpieces. Experimental cutting results validated potential of QPA.

Subject Categories:

  • Fabrication Metallurgy
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE