The thermal scratch seriously affects the surface quality of the cold rolled stainless steel strip. Some researchers have carried out qualitative and theoretical studies in this field. However, there is currently a la...The thermal scratch seriously affects the surface quality of the cold rolled stainless steel strip. Some researchers have carried out qualitative and theoretical studies in this field. However, there is currently a lack of research on effective forecast and control of thermal scratch defects in practical production, especially in tandem cold rolling. In order to establish precise mathematical model of oil film thickness in deformation zone, the lubrication in cold rolling process of SUS410L stainless steel strip is studied, and major factors affecting oil film thickness are also analyzed. According to the principle of statistics, mathematical model of critical oil film thickness in deformation zone for thermal scratch is built, with fitting and regression analytical method, and then based on temperature comparison method, the criterion for deciding thermal scratch defects is put forward. Storing and calling data through SQL Server 2010, a software on thermal scratch defects control is developed through Microsoft Visual Studio 2008 by MFC technique for stainless steel in tandem cold rolling, and then it is put into practical production. Statistics indicate that the hit rate of thermal scratch is as high as 92.38%, and the occurrence rate of thermal scratch is decreased by 89.13%. Owing to the application of the software, the rolling speed is increased by approximately 9.3%. The software developed provides an effective solution to the problem of thermal scratch defects in tandem cold rolling, and helps to promote products surface quality of stainless steel strips in practical production.展开更多
The thermal scratch significantly influences the surface quality of the cold rolled stainless steel strip. In or der to establish a precise mathematical model of oil film thickness in deformation zone, the lubrication...The thermal scratch significantly influences the surface quality of the cold rolled stainless steel strip. In or der to establish a precise mathematical model of oil film thickness in deformation zone, the lubrication in cold rolling process of B443NT stainless steel strip was studied in the laboratory. According to the principle of statistics, a math- ematical model of critical oil film thickness in deformation zone for thermal scratch was built, with fitting and regres- sion analytical method, and then based on temperature comparison method, the criterion for deciding thermal scratch defect was put forward. Storing and calling data through SQI. Server 2005, a software on thermal scratch control was developed in the Microsoft Visual Studio 2008 environment by MFC technique for stainless steel in tandem cold roll- ing, and then it was used into the practical production. Statistical results demonstrated that the hit rate of thermal scratch arrives at 91.47%, the occurrence rate of thermal scratch is decreased by 87.81%, and rolling speed is in- creased by 7.3%. The developed software is of significance to the control of products quality of stainless steel strips, and the analysis and solution to the problem of thermal scratch defects in tandem cold rolling.展开更多
对150 mm×150 mm连铸坯轧制Φ12 mm SCM435合金冷镦钢(%:0.35C、0.98Cr、0.16Mo)盘条的工艺试验表明:采用1020℃加热,900℃轧制,吐丝温度控制在780～800℃,相变前冷却速度控制在1℃/s左右,该钢可以获得均匀的铁素体+珠光体组织和...对150 mm×150 mm连铸坯轧制Φ12 mm SCM435合金冷镦钢(%:0.35C、0.98Cr、0.16Mo)盘条的工艺试验表明:采用1020℃加热,900℃轧制,吐丝温度控制在780～800℃,相变前冷却速度控制在1℃/s左右,该钢可以获得均匀的铁素体+珠光体组织和良好的冷镦性能。展开更多
轧辊对冷轧产品的质量、成材率及轧制成本的高低起着至关重要的作用。轧辊高效管理功能是冷连轧线高效轧制、稳定运行的基础。针对带钢冷连轧生产线的快节奏特点,利用Microsoft Visual Studio 2008进行软件的语言开发,通过Oracle 10g实...轧辊对冷轧产品的质量、成材率及轧制成本的高低起着至关重要的作用。轧辊高效管理功能是冷连轧线高效轧制、稳定运行的基础。针对带钢冷连轧生产线的快节奏特点,利用Microsoft Visual Studio 2008进行软件的语言开发,通过Oracle 10g实现数据存储和调用,利用Hum In G.net技术进行软件的界面设计,实现了Microsoft Visual Studio 2008,Oracle10g和Hum In G.net技术的联合应用。进行轧辊管理数据结构和数据库表设计,完成了轧辊管理模块的主要功能设计,进而实现轧辊数据信息的高效处理,最终设计了适合于工业生产实践的轧辊管理功能模块。现场应用表明,该轧辊管理模块设计人性化,执行效率高,在线状态信息反馈更为及时和准确,有效地提高了轧制节奏和生产效率,满足自动化生产的需求,具有良好的实际应用价值。展开更多
基金Supported by National Natural Science Foundation of China(Grant Nos.51174057,51274062)National High Technology Research and Development Program of China(863 Program,Grant No.2012AA03A503)
文摘The thermal scratch seriously affects the surface quality of the cold rolled stainless steel strip. Some researchers have carried out qualitative and theoretical studies in this field. However, there is currently a lack of research on effective forecast and control of thermal scratch defects in practical production, especially in tandem cold rolling. In order to establish precise mathematical model of oil film thickness in deformation zone, the lubrication in cold rolling process of SUS410L stainless steel strip is studied, and major factors affecting oil film thickness are also analyzed. According to the principle of statistics, mathematical model of critical oil film thickness in deformation zone for thermal scratch is built, with fitting and regression analytical method, and then based on temperature comparison method, the criterion for deciding thermal scratch defects is put forward. Storing and calling data through SQL Server 2010, a software on thermal scratch defects control is developed through Microsoft Visual Studio 2008 by MFC technique for stainless steel in tandem cold rolling, and then it is put into practical production. Statistics indicate that the hit rate of thermal scratch is as high as 92.38%, and the occurrence rate of thermal scratch is decreased by 89.13%. Owing to the application of the software, the rolling speed is increased by approximately 9.3%. The software developed provides an effective solution to the problem of thermal scratch defects in tandem cold rolling, and helps to promote products surface quality of stainless steel strips in practical production.
基金Sponsored by National Natural Science Foundation of China(51174057,51274062)National High Technology Research and Development Program of China(2012AA03A503)
文摘The thermal scratch significantly influences the surface quality of the cold rolled stainless steel strip. In or der to establish a precise mathematical model of oil film thickness in deformation zone, the lubrication in cold rolling process of B443NT stainless steel strip was studied in the laboratory. According to the principle of statistics, a math- ematical model of critical oil film thickness in deformation zone for thermal scratch was built, with fitting and regres- sion analytical method, and then based on temperature comparison method, the criterion for deciding thermal scratch defect was put forward. Storing and calling data through SQI. Server 2005, a software on thermal scratch control was developed in the Microsoft Visual Studio 2008 environment by MFC technique for stainless steel in tandem cold roll- ing, and then it was used into the practical production. Statistical results demonstrated that the hit rate of thermal scratch arrives at 91.47%, the occurrence rate of thermal scratch is decreased by 87.81%, and rolling speed is in- creased by 7.3%. The developed software is of significance to the control of products quality of stainless steel strips, and the analysis and solution to the problem of thermal scratch defects in tandem cold rolling.
文摘在实验室对SUS430不锈钢进行了冷轧润滑实验研究,建立了变形区油膜厚度数学模型.根据统计学原理,利用回归拟合方法给出了热滑伤变形区临界油膜厚度模型,进而提出了基于比厚度法的热滑伤缺陷判定准则.在Visual C++6.0环境下,通过SQL Server 2005实现数据存储和调用,采用MFC技术开发了不锈钢冷连轧表面热滑伤预报与控制软件,并实现了软件的在线应用.统计结果表明:在线使用该软件的热滑伤命中率达到87.74%,现场不锈钢卷热滑伤发生率下降83.81%,不锈钢卷轧制速度提高9.3%.该软件对不锈带钢表面质量控制、分析和解决冷连轧热滑伤缺陷问题具有重要意义.
文摘轧辊对冷轧产品的质量、成材率及轧制成本的高低起着至关重要的作用。轧辊高效管理功能是冷连轧线高效轧制、稳定运行的基础。针对带钢冷连轧生产线的快节奏特点,利用Microsoft Visual Studio 2008进行软件的语言开发,通过Oracle 10g实现数据存储和调用,利用Hum In G.net技术进行软件的界面设计,实现了Microsoft Visual Studio 2008,Oracle10g和Hum In G.net技术的联合应用。进行轧辊管理数据结构和数据库表设计,完成了轧辊管理模块的主要功能设计,进而实现轧辊数据信息的高效处理,最终设计了适合于工业生产实践的轧辊管理功能模块。现场应用表明,该轧辊管理模块设计人性化,执行效率高,在线状态信息反馈更为及时和准确,有效地提高了轧制节奏和生产效率,满足自动化生产的需求,具有良好的实际应用价值。
