油膜轴承倾斜承载对冷连轧机启动的影响

针对某CVC带钢冷连轧机启动阶段支持辊油膜轴承静压承载能力不足的问题,应用流体润滑理论,建立了轴承倾斜工作下静压承载能力的全润滑系计算模型,分析了轧机压下倾斜、油泵功率和节流器液阻对轴承静压承载性能的影响.计算结果表明,压下倾斜过大会造成轴套与衬套的轴线出现倾斜,进而导致轴承的静压承载能力急剧下降,是造成轴承寿命缩短、连轧机启动频繁失败的根本原因.在实际生产中,限定了轧机压下倾斜设定值上限,增大了润滑油黏度,从而有效提高了轴承的承载能力,机组启动成功率显著提高.     

Operation of water-recycling systems for rolling mills

Krivorozhstal' Combine. Translated from Metallurg, No. 4, p. 35, April, 1989.     

Reduction mills in helical rolling

The use of helical reduction mills is considered. Their scope in terms of rolling speed and deformation is assessed. The design and application of such mills is analyzed. A refined method is proposed for determining the width of the contact surface and the energy parameters. Experimental data are presented.     

Benefits of Steckel mills in rolling

The development of Steckel mills is reviewed, along with their advantages and disadvantages. In recent years, mills with heated coiling units have been widely adopted for the production of an extensive range of hot-rolled sheet and strip. New mechanical and organizational approaches are considered. Steckel mills are found to be expedient for use in mini mills and in casting and rolling systems.