Collaborative Research: Full Field Measurement of Cutting Tool Surface Temperatures

合作研究：切削刀具表面温度的全场测量

• 批准号: 1000764
• 负责人: Michael Graham
• 金额: $ 6.93万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-03-15 至 2013-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1000764&HistoricalAwards=false
• 关键词: Collaborative; Research; Full; Field; Measurement

The objective of this project is to measure the temperature distributions along the tool-chip interface and along the tool-workpiece interface, through transparent cutting tools, during the machining of hard to machine alloys. Two non-contact optical thermography techniques, namely, infrared thermography and two-wave laser induced fluorescence, will be used for full-field, high resolution measurements of the temperature fields along the surfaces of cutting tools. Transparent cutting tools of two designs will be used to optically access the rake and flank faces. Tool coatings made of temperature sensitive phosphors will be applied over transparent tools to enable fluorescence thermography. A newly developed split-optic will be used to simultaneously measure the infrared intensity in two wavelengths. The spatial resolution of the measurements will be from one to ten micrometers. With two-wave laser induced fluorescence, temporal resolution as low as one microsecond can be achieved. These capabilities will represent a major improvement over the current state of the art. The development of thin film sensors for high speed, full field, surface temperature measurements will be of use in a variety of applications requiring non-contact temperature monitoring. This study will be the first application of fluorescence thermography to study cutting temperatures and will lead to the first direct observations of the flank face temperature of new and worn tools. Measurement of the variation of the temperature distribution through the thickness of the workpiece will help improve our understanding of the plane stress to plane strain transition. The measured temperatures will help validate finite element simulations of machining, and lead to improved material constitutive models, friction models and tool wear models. Research results and methods will be incorporated into academic courses. A partnership will be formed with the McNair scholars program at Wichita State University to attract underrepresented students.

本项目的目标是通过透明刀具测量在难加工合金加工过程中沿刀具-切屑界面和沿刀具-工件界面的温度分布。两种非接触式光学温度成像技术，即红外热成像和两波激光诱导荧光，将用于全场、高分辨率地测量刀具表面的温度场。将使用两种设计的透明刀具对前刀面和后刀面进行光学接触。由温度敏感的荧光粉制成的工具涂层将被涂覆在透明工具上，以实现荧光热成像。一种新开发的分光镜将用于同时测量两个波长的红外强度。测量的空间分辨率将从1微米到10微米。利用两波激光诱导的荧光，可以获得低至1微秒的时间分辨率。这些能力将代表着对当前技术水平的重大改进。用于高速、全场、表面温度测量的薄膜传感器的开发将在需要非接触式温度监测的各种应用中使用。这项研究将是第一次应用荧光热像仪来研究切割温度，并将导致第一次直接观察到新的和磨损的刀具的后刀面温度。测量温度分布随工件厚度的变化有助于加深对平面应力向平面应变转变的理解。测量的温度将有助于验证加工的有限元模拟，并导致改进的材料本构模型、摩擦模型和刀具磨损模型。研究成果和方法将纳入学术课程。将与威奇托州立大学的麦克奈尔学者项目建立合作伙伴关系，以吸引代表性不足的学生。