Research Initiation: Thermomechanical Treatment of Moving Metal Strips in Rolling Processes

研究启动：轧制过程中移动金属带材的形变热处理

• 批准号: 8809167
• 负责人: Jim Chen
• 金额: $ 7.04万
• 依托单位: Temple University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8809167&HistoricalAwards=false
• 关键词: Research; Initiation; Thermomechanical; Treatment; Moving

A combined experimental and numerical research program is proposed to study the thermo-mechanical treatment (TMT) of moving metal strips in rolling processes. TMT using controlled cooling has been adopted to improve product quality and to reduce production cost. However, very little information is available on the heat transfer behavior of the cooling process. Therefore, this research is initiated to study the thermal behavior of strip rolling. Particular emphasis is placed on the measurement of the local convective heat transfer coefficients for jet boiling on moving strips. Three cooling systems will be investigated and compared: spray cooling, laminar jets, and water curtains. Surface thermocouples and thin film heat flux gages with fast response times (on the order of microseconds) will be used to measure the instantaneous surface temperatures and heat fluxes. Finite difference methods will be developed using Eulerian and Lagrangian approaches to analyze data and to predict strip temperatures in rolling conditions. The effect of strip material, strip temperature, and moving speed as well as the jet velocity and jet configuration on the local heat transfer coefficients will be investigated. Controlled cooling technology has recently been developed to perform on-line thermo-mechanical treatment (TMT) of the strips on the run out tables of hot-strip-mills. The result is a continuous process for producing high quality products in the as- rolled conditions. At present, however, the cooling system design is primarily based on a trial-and-error approach because the heat transfer behavior is not well understood. A better understanding of thermal and mechanical behavior of the strip cooling processes as described in the proposed research is needed.

提出了一个实验和数值相结合的研究方案， 研究移动金属带的热机械处理（TMT）， 轧制工艺 采用控制冷却的TMT已被采用， 提高产品质量和降低生产成本。 可是 很少有关于热传递行为的信息， 冷却过程。 因此，本研究旨在研究 带钢轧制热行为 特别强调 局部对流换热系数的测量 在移动的带上的喷射沸腾。 三个冷却系统将 研究和比较：喷雾冷却、层流射流和水 窗帘 表面热电偶和薄膜热通量计 快速响应时间（微秒级）将用于 测量瞬时表面温度和热通量。 有限差分方法将使用欧拉和 分析数据和预测条带的拉格朗日方法 轧制条件下的温度。 带材的影响， 钢带温度、移动速度以及喷射速度和 射流配置对局部换热系数的影响 研究了 控制冷却技术最近已经发展到 对带材进行在线热机械处理（TMT） 在热带米尔斯轧机的工作台上。 其结果是一个 生产高质量产品的连续工艺， 滚动条件。 目前，冷却系统 设计主要基于试错法，因为 热传递行为还没有被很好地理解。 更好的 了解带材的热性能和机械性能 在拟议的研究中所描述的冷却过程是 needed.