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IJAT Vol.15 No.4 pp. 521-528
doi: 10.20965/ijat.2021.p0521
(2021)

Paper:

Generation Method of Cutting Tool Paths for High-Speed and High-Quality Machining of Free-Form Surfaces

Yuki Takanashi*,†, Hideki Aoyama*, and Song Cheol Won**

*Keio University
3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan

Corresponding author

**UEL Corporation, Tokyo, Japan

Received:
January 10, 2021
Accepted:
March 26, 2021
Published:
July 5, 2021
Keywords:
CNC machine tool, free form surface, high speed and high accuracy machining, acceleration/deceleration, CAM system
Abstract

In general, NC programs for machining free-form surfaces using a computer numerical control (CNC) machine tool are generated using a computer-aided manufacturing (CAM) system. The tool paths (CL data) generated by a CAM system are approximated straight-line segments based on tolerance (allowable error). As a result, the tolerance affects the machining accuracy and time. If the tolerance is set to a small value, the lengths of the segments are shortened, and the machining accuracy is improved. The process in which a CNC machine tool reads and analyzes an NC program and controls the motors requires a minimum processing time of an NC program block (block-processing time). Therefore, if the lengths of the approximated straight-line segments are too small, it will be impossible to reach the indicated feed speed, and the machining time will be longer. In this study, by identifying the block-processing time of a CNC controller and deriving the appropriate length of the approximated straight-line segment based on the block-processing time, a CL data creation method that is capable of high-speed and high-accuracy free-form surface machining is proposed. In addition, experimental verification tests of the method are conducted.

Cite this article as:
Yuki Takanashi, Hideki Aoyama, and Song Cheol Won, “Generation Method of Cutting Tool Paths for High-Speed and High-Quality Machining of Free-Form Surfaces,” Int. J. Automation Technol., Vol.15, No.4, pp. 521-528, 2021.
Data files:
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Last updated on Nov. 25, 2021