针对我国钢铁企业轨梁生产线设备负荷不均、生产调度响应迟缓、新产品调试困难等问题,提出了一种基于组件技术的钢轨梁生产线物流仿真系统。建立了其体系结构,并对开发中的三个关键技术进行了论述,包括:建立设备组件库实现生产线全线建...针对我国钢铁企业轨梁生产线设备负荷不均、生产调度响应迟缓、新产品调试困难等问题,提出了一种基于组件技术的钢轨梁生产线物流仿真系统。建立了其体系结构,并对开发中的三个关键技术进行了论述,包括:建立设备组件库实现生产线全线建模;通过Drag and Drop机制实现仿真生产线的动态定义;基于Time-Unit Advance时钟推进实现复杂生产线的动态运行。最后,开发的仿真系统在某钢铁企业进行了应用实施,证明了其有效性。展开更多
The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock （mils, wheels and tyres） shows that ...The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock （mils, wheels and tyres） shows that one of the main factors determining their reliability and service life is the structural-phase state of steel, which is formed in the process of its producing. Complication of service conditions leads to the more severe requirements, specified by the consumers, where the high level of strength and hardness should be combined with high values of ductility and toughness. Realization of these requirements is possible only at the integrated approach to the improvement of technology of their production on the basis of profound knowledge in kinetics of austenite decay processes of structure formation and its contribution to the mechanical properties. With the formation of mainly bainite-martensite structures in the HAZ （heat-affected zone） metal of welded joints of these steels and saturation of this region with diffusive hydrogen their susceptibility to the cold cracking is increased. In this connection this work presents the results of investigations of effect of the WTC （welding thermal cycles） on the nature of structural transformations, hardness, static strength and resistance to the formation of cold cracks in HAZ metal of high-strength carbon rail steel M76. For this purpose, the structure and kinetics of transformation of an overcooled austenite was studied using the advanced methods of physical materials science by the modeling of phase transformations in the Gleeble 3800 unit. It was found that the cause of reduction in mechanical properties of welded joints of steel M76 is the formation of regions with a completely martensite structure in the amount of up to 5%. Results of investigations will be applied for the optimizing the technology and conditions of FBW of the advanced rail steels. 10 Ref., 4 Tables, 11 Figures.展开更多
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.70501036)重庆市自然科学基金(the NaturalScience Foundation of Chongqing City of China under Grant No.CSTC2006BB2243)
文摘针对我国钢铁企业轨梁生产线设备负荷不均、生产调度响应迟缓、新产品调试困难等问题,提出了一种基于组件技术的钢轨梁生产线物流仿真系统。建立了其体系结构,并对开发中的三个关键技术进行了论述,包括:建立设备组件库实现生产线全线建模;通过Drag and Drop机制实现仿真生产线的动态定义;基于Time-Unit Advance时钟推进实现复杂生产线的动态运行。最后,开发的仿真系统在某钢铁企业进行了应用实施,证明了其有效性。
文摘The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock （mils, wheels and tyres） shows that one of the main factors determining their reliability and service life is the structural-phase state of steel, which is formed in the process of its producing. Complication of service conditions leads to the more severe requirements, specified by the consumers, where the high level of strength and hardness should be combined with high values of ductility and toughness. Realization of these requirements is possible only at the integrated approach to the improvement of technology of their production on the basis of profound knowledge in kinetics of austenite decay processes of structure formation and its contribution to the mechanical properties. With the formation of mainly bainite-martensite structures in the HAZ （heat-affected zone） metal of welded joints of these steels and saturation of this region with diffusive hydrogen their susceptibility to the cold cracking is increased. In this connection this work presents the results of investigations of effect of the WTC （welding thermal cycles） on the nature of structural transformations, hardness, static strength and resistance to the formation of cold cracks in HAZ metal of high-strength carbon rail steel M76. For this purpose, the structure and kinetics of transformation of an overcooled austenite was studied using the advanced methods of physical materials science by the modeling of phase transformations in the Gleeble 3800 unit. It was found that the cause of reduction in mechanical properties of welded joints of steel M76 is the formation of regions with a completely martensite structure in the amount of up to 5%. Results of investigations will be applied for the optimizing the technology and conditions of FBW of the advanced rail steels. 10 Ref., 4 Tables, 11 Figures.
