基于ANSYS的铁水罐倾翻吊钩结构优化设计

利用ANSYS自带的／OPT优化模块及ANSYS提供的零阶优化方法,对一种铁水罐倾翻吊钩进行结构优化设计。根据吊钩的使用要求,将吊钩的厚度和圆孔半径作为优化变量,以吊钩自重为目标函数,达到减轻吊钩自重的目的,并对优化后的吊钩作出结构上的安全性评价。     

倾翻装置轴承损坏原因分析与结构改进设计

倾翻装置是阳极编组生产线中关键设备之一,工作时不能出现任何故障,否则将导致整条生产线停产。而在生产中倾翻装置的带座轴承却频频损坏,经过受力分析,采用COSMOSWorks对轴承座进行应力分析计算,找出了故障原因,经优化改进结构,消除了故障,延长了产品的使用寿命。     

热轧带钢控制冷却新技术-UFC

对热连轧带钢生产线上超快速冷却（UFC, ultra fast cooling）技术的发展过程、冷却原理、设备组成、布置形式、应用实例做系统介绍。     

热轧带钢层流冷却控制系统及控制方法

介绍带钢热连轧机层流冷却控制系统的现状、冷却策略及控制技术难点,对热轧带钢层流冷却控制方法进行实例分析。     

一起叉车倾翻事故原因分析及思考

通过对一起叉车倾翻事故原因的分析,提出防止事故发生的思考,认为叉车的作业安全主要取决于司机的即时操作,实现场（厂）内专用动机车辆使用安全,应着重增强司机安全责任意识和自我保护意识,将车辆安全操作规范,转化为司机掌握的自觉的操作技能,才能避免可能诱发风险的误操作。     

一起叉车纵向倾翻事故的原因分析及预防措施

对一起叉车纵向倾翻事故,通过现场勘查、现场测量进行原因分析。事故原因是驾驶员超载作业,叉车达到了倾翻力矩的极限,进而失去纵向稳定性向前倾翻,未可靠固定的平衡重向前脱落砸向驾驶员。对此提出了预防措施,以避免类似事故再次发生。     

热轧带钢生产状况分析及发展趋势预测

介绍了国内外热轧带钢的生产情况，对目前国内外热轧宽、窄带钢市场需求进行分析，预测未来我国热轧板带钢的发展方向和趋势。     

某型重卡板簧支架结构优化设计

针对某型重卡底盘系统结构整体改进后,车架安装孔位的变化致使板簧支架固定约束减少以及制造工艺的需改进等问题,企业要求在保障原有结构的使用功能和使用精密铸造工艺的基础上,对板簧支架进行更优的结构设计,并且不能增加其质量。首先根据原有模型的结构以及安装孔位的变化,确定其基本的结构模型;以此结构为优化对象,在极限工作的状况下,以降低结构质量为目标,以结构强度为约束,对支架结构进行拓扑优化设计;依据拓扑优化的结果,应用铸造工艺和设计经验进行再次设计,可得到最后的优化设计结果。优化后结构,在满足原有功能的前提下,设计出精密铸造的优化模型,达到了企业需求目标,这对重卡新型支架类零件的结构优化设计有重要的参考价值。     

热轧带钢轧辊破坏原因分析

分析了热轧带钢轧辊的破坏形式，并针对产生的原因提出了相应的解决措施，这些措施有利于提高轧辊的使用寿命。     

Plane strain hot rolling of slab and strip

A numerical solution of the steady-state plane strain hot rolling problem with maximum friction is found in the range from the thick slab to the thin strip rolling geometries. The problem is kinematically determinate, and it is solved on the physical and hodograph planes using the finite-difference approximation of hyperbolic differential equations of the plane strain rigid–plastic flow theory. A sequence of the boundary value problems defined by the slipline field mode is treated as a non-linear vector equation which is solved by Broyden’s secant method. Six versions of the FORTRAN PC programs are written for a wide range of the slab/strip rolling geometries. The solution for the thin strip rolling with large roll radius and small strip thickness reduction is approached to Prandtl’s thin plastic layer with homogeneous velocity field.     

Mathematical model for cold rolling and temper rolling process of thin steel strip

A mathematical model for cold rolling and temper rolling process of thin steel strip has been developed using the influence function method. By solving the equations describing roll gap phenomena in a unique procedure and considering more influence factors, the model offers significant improvements in accuracy, robustness and generality of the solution for the thin strip cold and temper rolling conditions. The relationship between the shape of the roll profile and the roll force is also discussed. Calculation results show that any change increasing the roll force may result in or enlarge the central flat region in the deformation zone. Applied to the temper rolling process, the model can well predict not only the rolling load but also the large forward slip. Therefore, the measured forward slip, together with the measured roll force, was used to calibrate the model. The model was installed in the setup computer of a temper rolling mill to make parallel setup calculations. The calculation results show good agreement with the measured data and the validity and precision of the model are proven.     

板带热轧三维有限元热力耦合仿真分析

采用更新的Langrange方法及大变形热力耦合有限元法对热轧过程进行了热力耦合仿真分析,经过多道次轧制仿真后,得出了轧件的温度场和轧制力分布以及每道次轧件入口与出口温度大小及轧制力的大小,并进行了现场工业实验对仿真结果进行了验证,计算结果表明,仿真所得结果与实测结果误差很小,均在5%之内,从而证明模型是正确的,能够很好的运用于热轧过程的参数计算和研究,并对以后热轧工艺参数匹配规律研究以及板形控制研究提供重要的分析平台和起到重要的指导作用.     

Genetic based sensorless hybrid intelligent controller for strip loop formation control between inter-stands in hot steel rolling mills

Safe operating environment is essential for all complex industrial processes. The safety issues in steel rolling mill when the hot strip passes through consecutive mill stands have been considered in this paper. Formation of sag in strip is a common problem in the rolling process. The excessive sag can lead to scrap runs and damage to machinery. Conventional controllers for mill actuation system are based on a rolling model. The factors like rise in temperature, aging, wear and tear are not taken into account while designing a conventional controller. Therefore, the conventional controller cannot yield a requisite controlled output. In this paper, a new Genetic-neuro-fuzzy hybrid controller without tension sensor has been proposed to optimize the quantum of excessive sag and reduce it. The performance of the proposed controller has been compared with the performance of fuzzy logic controller, Neuro-fuzzy controller and conventional controller with the help of data collected from the plant. The simulation results depict that the proposed controller has superior performance than the other controllers.     

Guided local search algorithm for hot strip mill scheduling problem with considering hot charge rolling

This study investigates the hot strip mill scheduling problem which is one of the most important planning problems in the steel industry. The problem is formulated using the prize collecting vehicle routing problem. The new proposed formulation considers more details and more realistic constraints than those used in previous studies. The hot charge technique leads to considerable savings in energy and other benefits in the process of steel production. In our proposed formulation, the necessary provisions required for obtaining an initial level of hot charge have been taken into consideration. A search algorithm has been developed that consists of three major phases including separation of slabs that can be scheduled, generation of an initial solution, and improvement of the solution. Generation of the initial solution is accomplished using a greedy constraint satisfaction algorithm and solution improvement through a guided local search. Proposed model and search algorithm have been tested on random and collected instances from practical production data in Mobarakeh Steel Complex. The experimental results show the high accuracy and efficiency of the proposed model and search algorithm.     

Investigation of interfacial behaviors between the strip and roll in hot strip rolling by finite element method

A finite element (FE)-based approach is presented for the precision analysis of the interfacial thermo-mechanical behavior of the roll and strip in the entire tandem mill during hot strip rolling. The validity of the proposed model is examined through the comparison with measurements. Then, the effect of various process parameters on the detailed aspects of interfacial thermo-mechanical behavior of the roll and strip is investigated via a series of process simulations.     

Analysis of tribological feature of the oxide scale in hot strip rolling

In this paper, the effects of the flow stress of the scale and steel, and the friction coefficients at the scale-steel and the roll-scale interfaces on the final surface roughness have been studied. The surface roughness increases for both oxide scale and steel with an increasing friction coefficient at the roll-scale interface. However, the roughness increment is limited. The calculated roughness is close to the measured value. The temperature affects the scale roughness transfer, and the maximum difference is about 25% when the temperature is 850-1025 °C for rolling speeds 0.12-0.72 m/s. The developed model is applicable in hot strip mills.     

热带钢连轧生产线的辅助设备切头飞剪

介绍滚筒式切头飞剪设备组成、结构特点及用途。     

Integration of batching and scheduling for hot rolling production in the steel industry

This paper investigates the hot rolling production scheduling problem in the steel industry and proposes a new mixed integer programming model for this problem based on the monolithic modeling strategy that integrates batching and scheduling. Using this strategy, the new model can simultaneously schedule multiple turns and simultaneously determine the production timetable of these turns in a global optimal view. A long-term tabu search heuristic using frequency-based memory is developed to obtain near-optimal solutions for this problem. Three kinds of speed-up strategies are developed to accelerate the search procedure of the proposed tabu search. A practical scheduling system combining the proposed mathematical model and the tabu search heuristic has been developed and tested on instances collected from practical production data. The experimental results show that the proposed mathematical model and the tabu search heuristic outperform both the current manual scheduling method and the traditional serial method.     

热连轧机夹送辊的表面堆焊工艺

阐述热连轧机夹送辊采用药芯焊丝堆焊的工艺过程,经实际产品生产与检验表明,该工艺能够满足产品的生产制造,避免了产品返修,取得了良好效果。