CAJ | 학술논문

复杂曲面加工广泛应用于模具行业. 由于加工参数缺乏科学的选择工具,数控加工的进给率常根据加工经验设定. 通常必须创建切削体积模型或矢量力模型来优化刀具路径各段的进给率. 鉴于模具型腔粗加工常采用2.5维加工,提出一种通过正交切削试验建立切削力曲面模型用于模具型腔粗加工进给率优选的新策略. 基于切削力曲面模型,采用多项式拟合的方法构建刀具在许可切削力下的侧向切深和进给率的方程,根据建立的方程计算每个刀位点处的进给率并反写到初始的G代码文件中. 通过典型模具型腔的粗加工试验验证,证明该进给率优化策略不仅可以缩短加工时间,而且可以使加工载荷均匀. 该策略对切削力载荷要求尽量均匀的模具型腔高速加工更有意义.
복잡곡면가공엄범응용우모구행업. 유우가공삼수결핍과학적선택공구,수공가공적진급솔상근거가공경험설정. 통상필수창건절삭체적모형혹시량력모형래우화도구로경각단적진급솔. 감우모구형강조가공상채용2.5유가공,제출일충통과정교절삭시험건립절삭력곡면모형용우모구형강조가공진급솔우선적신책략. 기우절삭력곡면모형,채용다항식의합적방법구건도구재허가절삭력하적측향절심화진급솔적방정,근거건립적방정계산매개도위점처적진급솔병반사도초시적G대마문건중. 통과전형모구형강적조가공시험험증,증명해진급솔우화책략불부가이축단가공시간,이차가이사가공재하균균. 해책략대절삭력재하요구진량균균적모구형강고속가공경유의의.
Sculptured surface machining is a critical process commonly used in die and mold industries. Since there is a lack of scientific tools in practical process planning stages, feedrates of NC machining are selected based on previous experiences. Usually, volumetric models or vector force models used for optimization of feedrate must be created to get the variable feedrate along the tool path. Considering the die-cavity roughing being a 2.5D cutting, a novel cutting force surface model is created based on orthogonal cutting tests. Based on the cutting force surface model, a polynomial equation of side cutting depth and feedrate is created to calculate the feedrate of each CL data and the calculated feedrate value is written out with the G-code position data block to an updated version of the die-cavity. The model is tested by a typical die-cavity roughing, and shortening machining time and balancing cutting-load can be attained. The presented feedrate scheduling characterized by balancing the cutting-loads in die-cavity roughing will be more significant in high speed machining.