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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.
Complicated surface machining is widely used in the mold industry.Due to the lack of a scientific selection tool for machining parameters, the feedrate for CNC machining is often set based on machining experience.Cutting volume models or vector force models typically have to be created to optimize the feed for each section of the toolpath In view of the two-dimensional machining often used in the roughing of the die cavity, a new strategy for establishing the cutting force surface model by orthogonal cutting test is proposed.It is based on the cutting force surface model, using the polynomial The fitting method builds the equations for the lateral depth of cut and feed rate of the tool under the allowable cutting force and calculates the feedrate at each tool point according to the established equation and writes it back to the original G code file. The typical mold cavity roughing test proved that this feed rate optimization strategy not only can shorten the processing time, but also make the machining load uniform.This strategy is more meaningful to the mold cavity high-speed machining which requires uniform cutting force load.