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Research Papers

Modification of Tool Orientation and Position to Compensate Tool and Part Deflections in Five-Axis Ball End Milling Operations

[+] Author and Article Information
M. Habibi

Manufacturing Automation Laboratory,
Department of Mechanical Engineering,
The University of British Columbia,
2054-6250 Applied Science,
Lane Vancouver, BC V6T 1Z4, Canada
e-mail: mohsen.habibi@ubc.ca

O. Tuysuz, Y. Altintas

Manufacturing Automation Laboratory,
Department of Mechanical Engineering,
The University of British Columbia,
2054-6250 Applied Science,
Lane Vancouver, BC V6T 1Z4, Canada

Manuscript received April 6, 2018; final manuscript received November 10, 2018; published online January 17, 2019. Assoc. Editor: Satish Bukkapatnam.

J. Manuf. Sci. Eng 141(3), 031004 (Jan 17, 2019) (9 pages) Paper No: MANU-18-1214; doi: 10.1115/1.4042019 History: Received April 06, 2018; Revised November 10, 2018

Tool-workpiece deflection is one of the major error sources in machining thin walled structures like blades. The traditional approach in industry to eliminate this error is based on modifying tool positions after measuring the error on the machined part. This paper presents an integrated model of cutting force distribution on the tool–blade contact, automatic update of blade static stiffness matrix without resorting to time-consuming finite element solutions as the material is removed, the prediction and compensation of static deflection marks left on the blade surface. The main focus of the paper is to compensate the deflection errors by respecting the maximum form errors, collision of tool/machine/workpiece, cutting speed limit at the tool tip, and ball end—blade surface contact constraints. The compensation has been carried out by two modules. The first module adjusts the tool orientation along the path to reduce the error by constructing an optimization problem. This module is computationally inexpensive and results in about 70% error reduction based on the conducted experiments. The modified tool path resulted from the first module is fed to the second module for further reduction of the form errors if needed at the violated cutter locations; hence it takes less computational time than the stand alone approach proposed in the literature. The proposed algorithms have been experimentally validated on five-axis finish ball end milling of blades with about 80% reduction in cutting force induced form errors.

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References

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Figures

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Fig. 1

Flowchart of proposed compensation method

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Fig. 2

Schematic view of ball end milling process: (a) deflected blade and cutter and (b) detailed view of the cutter and workpiece contact region

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Fig. 3

Cutting force prediction at φ = φcc

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Fig. 5

Illustration of the constraint implementation to prevent tool tip engagement with the workpiece

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Fig. 6

Schematic view of the experiment: (a) six passes helically wrapped around the blade and (b) surface error versus design variables at i = 402

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Fig. 7

Illustration of the experiment: (a) five-axis machining and (b) the machined part measurement by CMM

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Fig. 8

Tool orientation in (a) nominal path, (b) optimized path, and (c) tool axes map

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Fig. 9

Comparison of the measured, predicted, and compensated surface error for six passes shown in Fig. 6, predicted: predicted surface error for nominal NC code, measured: measured surface error for nominal NC code, module I: measured surface error for the modified NC code using module I, module II: predicted surface error for the modified NC code using module II. The total computation time for modules I and II is ∼11 min and ∼45 min, respectively.

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