关键词: 数控系统, 进给速度, 前瞻规划, 插补, 加减速

Abstract: To realize the look-ahead feedrate planning for continuous multi-type curve segments composed of lines,arcs and parametric curves,a look-ahead feedrate planning algorithm was proposed.The pre-reading tool path was taken as a planning unit to be divided into several continuous multi-type curve segments by segmentation rules.The critical feedrate constraints at the joint points were calculated by the confined geometrical errors and dynamic constraints.The cubic polynomial feedrate profile was utilized,and the feedrate parameters limited by curve length were solved by analytic methods to maximize the dynamic performance of machine tools.The backtrack re-planning strategy was utilized for global planning to keep the continuity of feedrate profile between curve segments.The compensation strategy was used to reduce the planning errors and improve the terminal accuracy.Experiment analysis showed that the algorithm could significantly improve the terminal accuracy,generate smooth feedrate profile and reduce the machining time.The feasibility and applicability of the proposed algorithm were verified,and the dynamic performance of machine tools could be maximized.

Key words: CNC system, feedrate, look-ahead planning, interpolation, acceleration/deceleration