Research Initiation: Computer Generated Computer NumericallyControlled Machining Feedrates with In-Process Tuning

这项研究工作的重点是计算机系统， 自动生成进给速度，以提高 计算机数控（CNC）加工。 可靠性 还通过在加工过程中调整进料速率来进行改进， 材料属性和刀具几何形状发生变化。 这些目标 （1）几何与几何的结合， 用于体积计算的机械端铣模型， 自动选择铣削复杂曲面的进给速度; (2)通过比较程序设定的进料速率进行过程中调整 实际切削力（功率）与预测力（功率）的比值。 一个程序来自动选择进给速度复杂 雕刻端铣刀是从实验发展 验证了端铣的机械和几何模型 过程 该计划将进行实验测试，使用 提供给研究团队的数控（NC）程序 一个工业合作伙伴。 这些程序用于加工 用于复杂雕刻表面的冲压模具。 中的结果 切割时间、公差和表面光洁度将 与行业结果相比， 手工 可在线调整编程进给速度 将添加到新罕布什尔州大学的数控机床， 提供了一种方法，以适应不同的工件的进给速度 材料和刀具磨损。 该项目将导致四个国家的进步- （1）改进的立铣加工机理模型; (2)机械模型和几何模型的一体化 系统;（3）计算所需立铣刀的方法 基于几何公差信息的进给速度;（4） 实验证明在线进给速度调整方法。

This research effort is focused on a computer system for automatic generation of feedrates for improving the efficiency of Computer Numerically Controlled (CNC) machining. Reliability is also improved by in-process adjustment of the feedrates to handle material property and cutter geometry changes. The goals are to be accomplished through: (1) integration of geometric and mechanistic end milling models for volume calculations and automatic selection of feedrate for milling sculptured surfaces; (2) in-process adjustment of the programmed feedrate by comparing the actual cutting force (power) to the predicted force (power). A program to automatically select the feedrates for complex sculptured end milling cuts is to be developed from experimentally verified mechanistic and geometric models of the end milling process. The program will be experimentally tested using Numerically Controlled (NC) programs supplied to the research team by an industrial partner. The programs are used for machining stamping dies for complex sculptured surfaces. The results in terms of cutting time, tolerances, and surface finish will be compared to industry results, where feeds and speeds are set manually. On-line adjustment capability of the programed feedrates will be added to the University of New Hampshire CNC machine to provide a method to adapt the feedrates to different workpiece materials and cutter wear. This project should lead to four advances in the state-of-the- art: (1) an improved mechanistic model of the end milling process; (2) integration of mechanistic and geometric models into one system; (3) method to calculate the necessary end milling cutting feedrates based on geometric tolerance information; (4) an experimentally proven on-line feedrate adjustment method.