Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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A Study of Feedrate Optimization for Tolerance Error of NC Machining

NC가공에서 허용오차를 고려한 가공속도 최적화에 관한 연구

  • Lee, Hee-Seung (Dept. of Mechanical Engineering, Sogang University) ;
  • Lee, Cheol-Soo (Dept. of Mechanical Engineering, Sogang University) ;
  • Kim, Jong-Min (Sogang Institute of Advanced Technology, Sogang University) ;
  • Heo, Eun-Young (Sogang Institute of Advanced Technology, Sogang University)
  • Received : 2013.05.30
  • Accepted : 2013.10.04
  • Published : 2013.10.15
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Abstract

In numerical control (NC) machining, a machining error in equipment generally occurs for a variety of reasons. If there is a change in direction in the NC code, the characteristics of the automatic acceleration or deceleration function cause an overlap of each axis of the acceleration and deceleration zones, which in turn causes a shift in the actual processing path. Many studies have been conducted for error calibration of the edge as caused by automatic acceleration or deceleration in NC machining. This paper describes a geometric interpretation of the shape and processing characteristics of the operating NC device. The paper then describes a way to determine a feedrate that achieves the desired tolerance by using linear and parabolic profiles. Experiments were conducted by the validate equations using a three-axis NC machine. The results show that the machining errors were smaller than the machine resolution. The results also clearly demonstrate that the NC machine with the developed system can successfully predict machining errors induced with a change in direction.

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