Engineering Faculty Internship: Modeling of the Two-Dimensional Chip Breaking Process for Maching with a Grooved Tool Insert

工程学院实习：使用凹槽刀具进行加工的二维断屑过程的建模

• 批准号: 9311819
• 负责人: Ibrahim Jawahir
• 金额: $ 2.5万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311819&HistoricalAwards=false
• 关键词: Engineering; Faculty; Internship; Modeling; Two

This proposed work is to develop a new cutting force model for chip breaking in machining with a conventional grooved tool insert. This is expected to be accomplished using a recently established force model for machining with a flat-faced (non-chip forming) tool. The proposed work will involve analytical modeling of the process of chip breaking process for conditions requiring consideration of additional forces at the free-end of the chip as well as at the back-wall of the chip groove. Variable frictional conditions will be assumed at the chip/tool back-wall and chip/work surface contact points. The well known shear plane theory of metal cutting will be extended to include the effects of the above additional friction forces. Experimental work will include the use of a high speed filming camera system to study the varying chip curling and breaking patterns within a typical chip breaking cycle while continuously monitoring the cutting force variations with the use of a three-component tool dynamometer system. Based on the analytical simulations and the experimental work, it is expected to model the curled chip using the finite element modeling technique for continuously varying chip loading. The variation of mechanical properties such as the tensile strain which normally contribute to the chip breaking process will be estimated. The major objective of this work is to establish the most significant factors that influence chip breaking and to develop a new chip breakability criterion based on the new findings. It is hoped that the new findings anticipated in this project will help cutting tool manufacturers in designing new and innovative chip forming tool inserts.

本文提出的工作是建立一个新的切削力模型， 在用传统的带槽刀具刀片进行加工时断屑。 预计将利用最近建立的 平面切削力模型（无切屑成形） 工具. 拟议的工作将涉及分析建模的 断屑过程的条件要求 考虑到芯片自由端的附加力， 以及切屑槽的后壁。 可变摩擦 假设切屑/刀具后壁和切屑/工件处的条件 表面接触点。 著名的金属剪切平面理论 削减将扩大到包括上述影响 额外的摩擦力。 实验工作将包括使用 高速摄影摄像系统，以研究变化的芯片 在典型断屑循环中的卷曲和断裂图案 同时连续地监测切削力随 使用三分量工具测力计系统。基于 分析模拟和实验工作，预计 使用有限元建模对卷曲的切屑进行建模 用于连续改变切屑加载的技术。 的变化 机械性能，如拉伸应变， 对断屑过程的贡献将被估计。 这项工作的主要目标是建立最 分析了影响断屑的主要因素， 基于新发现的新的切屑破碎性标准。 是 我希望这个项目中预期的新发现将有助于 切削刀具制造商在设计新的和创新的芯片 形成工具插入件。