关键词: 规划单元, 微小直线段, 速度规划, 数控系统, 在线前瞻

Abstract: To improve the efficiency of feedrate planning algorithm and to deal with the cross-segment interpolation problem,the planning unit which contained some short line segments was proposed.According to the velocity constraints of planning unit's each control points such as acceleration constraint,error constraint and cross-segment interpolation constraint,the feedrate and end-position velocity of planning unit were calculated.To realize the continuous machining of short line segments,a real-time look-ahead algorithm was present,and a look-ahead buffer was established to store the pre-reading planning unit.The feedrate backtracking algorithm was utilized to guarantee the continuity of feedrate and to reduce feedrate fluctuation.The real-time look-ahead feedrate planning algorithm of short line segment was applied in CNC milling for tooth restoration,and the result showed that the proposed algorithm could satisfied the manufacturing requirements for high feedrate and accurate tooth restoration.

Key words: planning unit, short line segment, feedrate planning, computer numerical control system, real-time look-ahead