Open AccessGeneration Method of Cutting Tool Paths for High-Speed and High-Quality Machining of Free-Form Surfaces
Author(s) -
Yuki Takanashi,
Hideki Aoyama,
Song Cheol Won
Publication year - 2021
Publication title -
international journal of automation technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.513
H-Index - 18
eISSN - 1883-8022
pISSN - 1881-7629
DOI - 10.20965/ijat.2021.p0521
Subject(s) - machining , numerical control , block (permutation group theory) , process (computing) , machine tool , line (geometry) , engineering drawing , computer science , controller (irrigation) , set (abstract data type) , cnc milling , computer aided manufacturing , mechanical engineering , algorithm , engineering , cad , geometry , mathematics , agronomy , biology , programming language , operating system
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.