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Controller designs for constant cutting force turning machine control

Pitstra1, Pieper

  • 1Department of Mechanical Engineering, University of Calgary, AB, Canada.

ISA Transactions
|June 28, 2000
PubMed
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This study simulated metal turning control. A fixed-gain sliding mode controller matched complex adaptive controllers in performance for challenging nonlinear dynamics.

Area of Science:

  • Manufacturing Engineering
  • Control Systems Engineering
  • Materials Science

Background:

  • Metal turning processes present significant control challenges due to inherent nonlinearities and time-varying dynamics.
  • Achieving precise force control is crucial for part quality and process efficiency in manufacturing.
  • Existing control strategies require evaluation for robustness and adaptability in dynamic environments.

Purpose of the Study:

  • To simulate and compare the performance of various controllers for a constant cutting force metal turning process.
  • To evaluate the force tracking capability and flexibility of Proportional-Integral-Derivative (PID), adaptive, non-adaptive sliding mode, and model reference adaptive controllers.
  • To determine if simpler control strategies can achieve performance comparable to more complex adaptive methods.

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Main Methods:

  • Development of simulated implementations for PID, adaptive sliding mode, non-adaptive sliding mode, and model reference adaptive controllers.
  • Testing of closed-loop systems under a range of cutting conditions and specific machined part contours.
  • Verification of force tracking accuracy and control scheme flexibility through simulation results.

Main Results:

  • All simulated controllers demonstrated varying degrees of force tracking capability.
  • A carefully designed fixed-gain sliding mode controller with output feedback achieved performance comparable to more complex adaptive controllers.
  • The study highlights the effectiveness of sliding mode control in managing nonlinear and time-varying dynamics.

Conclusions:

  • Fixed-gain sliding mode controllers offer a viable and potentially simpler alternative to complex adaptive controllers for constant cutting force metal turning.
  • Effective controller design is paramount for achieving robust performance in challenging manufacturing processes.
  • Simulation provides a valuable tool for evaluating and comparing control strategies before physical implementation.