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research-article

Dynamics of Multi-point Thread Turning, PART I: General Formulation

[+] Author and Article Information
Mohammad Khoshdarregi

Assistant Professor, ASME Member, Intelligent Digital Manufacturing Laboratory (IDML), Dept of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada, R3T 5V6
m.khoshdarregi@umanitoba.ca

Yusuf Altintas

Professor, Fellow of ASME, Manufacturing Automation Laboratory (MAL), Dept of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada V6T 1Z4
altintas@mech.ubc.ca

1Corresponding author.

ASME doi:10.1115/1.4038570 History: Received June 28, 2017; Revised November 18, 2017

Abstract

This paper formulates the generalized dynamics and stability of thread turning operations with custom multi-point inserts. The closed loop chip regeneration mechanism is modeled by evaluating the effect of the current vibrations and the vibration marks left from the previous tooth. Using the developed chip discretization method, the dynamic cutting and process damping forces are obtained at each point along the cutting edge by projecting the three-dimensional vibrations of the tool and workpiece in the direction of local chip thickness. The equation of motion is derived in both physical and modal spaces, and stability is analyzed in frequency domain using Nyquist criterion. An iterative process optimization algorithm has been developed to maximize productivity while respecting machine tool's torque and power limits. Extension of the model to thin-walled workpieces along with the validating experiments on real scale oil pipes are presented in Part II of this article.

Copyright (c) 2017 by ASME
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