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

研究启动：计算机生成具有过程调整的计算机数控加工进给率

• 批准号: 9110747
• 负责人: Barry Fussell
• 金额: $ 6.5万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9110747&HistoricalAwards=false
• 关键词: Research; Initiation; Computer; Generated; NumericallyControlled

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.

这项研究工作集中在计算机系统上，用于自动生成进料率，以提高计算机控制（CNC）加工的效率。 通过处理进料率以处理材料特性和切割器几何形状变化，可以提高可靠性。 目标是通过以下方式实现的：（1）几何和机械末端铣削模型的整合，用于计算体积和自动选择用于铣削雕刻表面的进给率； （2）通过将实际切割力（功率）与预测力（功率）进行比较，对程序化进给率进行了进程。 可以自动选择复杂雕刻末端铣削切割的饲料率的程序，该程序将从实验验证的末端铣削过程的机械和几何模型中开发出来。 该计划将通过工业合作伙伴提供给研究团队提供的数值控制（NC）计划对实验进行测试。 这些程序用于加工盖章模具，用于复杂的雕刻表面。 在切割时间，公差和表面饰面方面的结果将与行业结果进行比较，该结果将手动设置为饲料和速度。 将在新罕布什尔大学CNC计算机上添加编程饲养额的在线调整能力，以提供一种使进料库适应不同工件材料和切割机磨损的方法。 该项目应导致最先进的四个进步：（1）改进的终端铣削过程的机械模型； （2）将机械和几何模型集成到一个系统中； （3）根据几何耐受性信息计算必要的末端铣削饲料率的方法； （4）一种经过实验证明的在线进给率调整方法。