POMINI夹送辊小铜套易损分析及改进

分析了意大利POMINI夹送辊小铜套易损的原因，并对其结构进行了改进，问题得到了解决。     

Modeling and Simulation of Radial-Axial Large Ring Rolling

Finite element model is constructed according to the principle and characteristics of radial-axial large ring rolling technology. Dynamic explicit finite element method is used to simulate the rolling process. An effective modeling method of guide roller is proposed. Simulation indicates that high quality ring product could be obtained when rational rotational speed of rollers and feed rate in the radial and axial rolling are assigned.     

Slab analysis of asymmetrical sheet rolling

In this paper, a theoretical model based on slab method of analysis for plane strain asymmetrical rolling is presented. In this model the non-uniformity of the normal and shear stresses in deriving of the governing equations are considered. This model can predict the required external loading to the plate at entry to keep the plate horizontal. The analytical rolling force, torque and pressure of this model were compared with the experimental and analytical results of other investigators. Numerical and experimental results are shown to be in good agreements.     

热轧终轧温度对冷轧无取向电工钢析出物的影响

研究了热轧终轧温度对低碳低硅无取向电工钢热轧带中第二相析出物的影响。结果发现，在高温γ相区终轧卷相后，析出物的直接较大，析出物体积分数较高；在α γ两相区终轧卷相后，析出物的直径也较大，但析出物体积分数较小；在α相区终轧卷取后，析出物的直径较小，析出物体积分数较小。     

Effect of residual stress on ACFM crack measurements in drill collar threaded connections

The drill collar threaded connection of the type used in hydrocarbon exploration is a critical component of the drillstring that is highly susceptible to fatigue damage. In an attempt to reduce costly downhole failures the connections are cold rolled to introduce compressive residual stress, and when in service the connections are routinely inspected. The Alternating Current Field Measurement (ACFM) technique is an increasingly popular method of thread inspection, however, results have indicated that the ACFM defect sizing capability may be compromised when it is used to inspect recently cold rolled connections. If a connection is cold rolled without first being defect free, subsequent inspections may under estimate crack depth with the standard interpretation. Inspection before rolling is therefore necessary.     

不对称异径轧机单辊传动咬入条件的探讨

用力的平衡法推导出了不对称径单辊传动二辊轧机和四辊轧机的咬入条件公式。     

探边测试技术在楚28断块滚动开发中的应用

本文总结了楚28断块滚动开发过程中,充分利用探边测试资料进行滚动井位布置。重点论述了利用实际地层倾角来校正油水界面,利用试油、试采的动态资料与测试资料相互印证,对原滚动设计方案进行了修改,从而节约了开支,取得了可观的经济效益。     

1+1热轧机组中凸度控制技术

试验以解决带材中凸度过大为目的,制定了把带材中凸度控制在1%以下的试验目标。重点关注两点:弯辊调整对板形中凸度的影响和不同工作辊凸度对板中凸度的影响。     

中厚板表面“黑点麻坑”的形成机理研究

针对南钢中厚板表面麻坑缺陷较严重的问题,结合实际生产工艺研究了该缺陷的形成机理.结果表明,该缺陷是热轧时形成的氧化皮破碎后压入钢板表面造成的,形成于精轧后部道次.通过优化实际生产中的热轧和除鳞工艺,有效提高了产品表面质量,降低了生产成本.     

Numerical Simulation Analysis of Influence Factors to Shearing Force of Rolling Shear

The calculation results show that relative cut-in depth at the moment of maximum shearing force decreases with the increase of steel plate thickness; along with blade clearance increasing, shearing for...