Modeling the Frictional Contact Geometry in Machining Using Fractals

使用分形对机械加工中的摩擦接触几何进行建模

• 批准号: 0140557
• 负责人: Shivakumar Raman
• 金额: $ 13.5万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-15 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140557&HistoricalAwards=false
• 关键词: Modeling; Frictional; Contact; Geometry; Machining

This grant will research friction at the tool-chip interface in machining and will attempt to quantify the extents of seizure and sliding islands. Preliminary analysis conducted through a prior exploratory grant will be extended to better examine the non-Euclidean nature of frictional contact. The role of cutting conditions, tool and work materials, tool preparation and atmospheric oxidation will be determined in evaluating map areas and perimeters. The primary objective of this research is to develop a fractal model of the frictional contact geometry at the tool rake face in machining. The physics and mathematics of friction will be investigated using a fractal geometric approach, to determine relationships for cutting variables such as area of contact, cutting forces, energy consumed, tool temperatures and wear, extending on preliminary work. These models will be validated and improved with data obtained from conventional as well as specialized experiments. Seizure will be examined at a fundamental level and the role of physical mechanisms in its creation and extinction at the interface quantified. Seizure will be studied by varying tool surface preparation, oxidation, controlled tool coatings, work material prior processing and tool wear. The material and cutting conditions leading to different fractal dimensions will be physically modeled and validated experimentally. Issues of similarity, scaling and stationarity will be suitably studied to develop predictive models of the cutting process.This project is expected to lead to improved models of the cutting process and consequently to its imminent automation. This research will be useful in cutting tool design, tool coating evaluation, and process optimization. The scalability of frictional models to finer scales of machining will also result from this treatment.

该基金将研究加工中刀具-切屑界面的摩擦，并试图量化卡滞和滑动岛的程度。 通过先前的探索性资助进行的初步分析将被扩展，以更好地研究摩擦接触的非欧几里得性质。切削条件、刀具和工件材料、刀具准备和大气氧化的作用将在评估地图区域和周长时确定。 本研究的主要目的是建立切削过程中刀具前刀面摩擦接触几何的分形模型。 摩擦的物理和数学将使用分形几何方法进行研究，以确定切削变量之间的关系，如接触面积，切削力，消耗的能量，刀具温度和磨损，扩展到前期工作。 这些模型将得到验证和改进，从传统的以及专门的实验获得的数据。 癫痫发作将在一个基本的水平和物理机制的作用，在其创建和灭绝的接口量化检查。将通过改变刀具表面处理、氧化、受控刀具涂层、加工前的工件材料和刀具磨损来研究咬合。 材料和切削条件导致不同的分形维数将物理建模和实验验证。 将适当研究相似性、缩放和平稳性问题，以开发切割过程的预测模型。预计该项目将导致切割过程的改进模型，从而实现其即将实现的自动化。 本研究对刀具设计、刀具涂层评价和工艺优化具有一定的指导意义。摩擦模型的可扩展性，以更精细的加工尺度也将导致从这种处理。