螺旋斜轧轧辊

自苏联学者采里柯夫提出的螺旋斜轧轧辊的节面是单叶旋转双曲面、轧辊与工件节面的接触线是单叶旋转双曲面的一条直母线后,一直沿用至今。笔者在实际设计轧辊时经理论推导,否定了上述论点;导出了轧辊节面及其接触线的方程式。证明轧辊节面是一个与轧辊倾角α,轧辊喉半径R_o、工件节圆柱半径r有关的旋转曲面;轧辊、工件节面的接触线是一条曲线。本文理论推导出的公式也适用于其它圆柱螺旋面的斜轧或斜切,如圆柱体的无心磨削、蜗杆及螺杆的轧制等。一、轧辊节面设o_1x_1y_1z_1为工件座标系,oxyz为轧辊座标系。两座标系分别在垂直于x轴且距     

基于知识的焊管轧辊设计系统

将KBE技术应用于轧辊设计中，建立了基于知识的轧辊设计系统的框架体系。运用基于规则的推理方法确定轧辊类型，根据面向对象的知识表示方法，阐述了轧辊的知识建模技术，有效地提高了轧辊设计的智能化程度，提高了设计的质量和效率，减少了设计对设计人员经验的依赖。     

轧辊磨床中心架的参数化设计

轧辊磨床用中心架品种繁多。本文介绍采用SolidWorks三维设计软件，以参数化设计的方法，建立轧辊磨床中心架的三维模型库。从而实现了轧辊磨床中心架的系列化设计，简化了设计过程，也为进一步优化设计建立了基础。     

基于V-Ti-Cr-Mo无限冷硬球墨铸铁轧辊的研究

提高轧辊自给率、降低轧辊消耗及充分利用资源优势，扩大钒钛生铁的应用范围，对提高企业的经济效益具有重要意义。为此，言语中以开发V-Ti-Cr-Mo无限冷硬球墨铸铁轧辊的生产技术为目的，分析了轧辊的使用特点，设计了轧辊的化学成分和生产工艺，并对试样进行了硬度和金相组织分析研究，显示了该轧辊的可行性。     

使用COSMOSWorks优化磨床中心架设计

1.轧辊磨床中心架的虚拟设计 随着轧钢行业的发展,轧辊的种类、规格越来越多。对于轧辊进行精加工的轧辊磨床其规格、品种也相应增多,（轧辊重量大,可达几十吨。为提高加工质量,一般在轧辊磨床上使用的中心架支撑工件）中心架也就品种繁多。虽然结构大同小异，但是设计的工作量很大。简化设计过程，优化设计，是设计人员迫切希望解决的问题。     

可变挠度中固系列轧辊的优化设计

对可变挠度中固轧辊的特点与应用进行了分析,探讨了中固系列轧辊的优化设计方法,简化了不同系列轧辊的设计过程,提高了设计可靠性,进一步挖掘了中固轧辊的使用潜力。     

冷弯型钢成型轧辊的设计方法

以理论分析为基础，结合实践经验论述了设计冷弯型钢轧辊应考虑的因素，介绍了参数选择方法，为合理设计成型轧辊提供了有效的方法。     

基于模糊可靠性理论高速线材轧辊优化设计的研究

高速线材轧辊工作时受交变应力作用，断裂问题时有发生。本文利用模糊可靠性理论，探讨在随机变量和模糊变量组合时轧辊的模糊可靠性设计方法；通过实例设计和生产实验证实了该方法的优化效果，轧辊使用寿命有了显著的提高。     

斜轧轧辊与轧件空间接触状态的理论分析

斜轧轧辊与轧件空间接触状态的理论分析，对于斜轧孔型设计的正确和工艺可行意义重大，借助数学手段对轧辊和轧件的空间接触状态进行了分析和讨论，得到了有意义的结论。     

精密异型材四辊组合孔型轧机设计

设计了一种精密异型材四辊组合孔型轧机。该轧机成功的将型材轧制与拉拔工艺相结合,可以加工制造多种类型的型材。设计的新型轧辊系统可实现轧辊的快速更换,节省了生产成本;设计了轧辊位置调整机构,包括轴向与径向的轧辊调整,通过两种调整机构的配合,可调整出多种孔型,满足不同需求;并实现轧辊利用率的最大化。通过产品试制,得到了满足要求的型材产品。     

Planetary ball transmissions: Strength calculations

The design of transmissions with intermediate rollers is considered. A structure for spherical planetary ball transmission is proposed. Formulas for the forces on the rollers are proposed, along with a method of calculating the strength of transmission components and an algorithm for determining the engagement coefficient.     

螺旋孔型斜轧连接颈应力的研究

针对螺旋孔型斜轧球墨铸铁的轧制缺陷之一——连接颈的早断 ,分析了连接颈部分所受外力的分布状况及其数学式 ,并以 3 0 mm的球墨铸铁磨球为例进行了计算 ,给出了在三种情况下的连接颈应力变化曲线 ,由此判断最大应力发生的部位 ,而且分析了轧辊直径对连接颈应力的影响曲线。分析轧制产品可知 ,计算结果比较令人满意。最后 ,给出了轧制 3 0 mm磨球时轨辊直径的选取范围     

A study on the fault diagnosis of roller-shape using frequency analysis of tension signals and artificial neural networks based approach in a web transport system

Rollers in the continuous process systems are ones of key components that determine the quality of web products. The condition of rollers (e.g. eccentricity, runout) should be consistently monitored in order to maintain the process conditions (e.g. tension, edge position) within a required specification. In this paper, a new diagnosis algorithm is suggested to detect the defective rollers based on the frequency analysis of web tension signals. The kernel of this technique is to use the characteristic features (RMS, Peak value, Power spectral density) of tension signals which allow the identification of the faulty rollers and the diagnosis of the degree of fault in the rollers. The characteristic features could be used to train an artificial neural network which could classify roller conditions into three groups (normal, warning, and faulty conditions). The simulation and experimental results showed that the suggested diagnosis algorithm can be successfully used to identify the defective rollers as well as to diagnose the degree of the defect of those rollers.     

双盘直槽研磨圆柱滚子稳定自转条件分析与试验

为解决双盘直槽研磨方法中圆柱滚子稳定自转问题,对研磨状态下的圆柱滚子的自转运动进行理论分析,计算获得滚子实现稳定自转运动的条件。设计了一种电磁研磨盘,引入电磁力以增大驱动滚子自转的摩擦力矩,改善滚子的自转条件。对电磁研磨盘的磁路进行参数化设计和电磁仿真优化,并制作出电磁研磨盘实物,仿真分析和试验结果都表明所设计的电磁研磨盘能够对圆柱滚子提供足够大且分布均匀的电磁吸力。在自制的试验台架上对12 mm×18 mm圆柱滚子进行研磨试验,验证了自转条件的正确性。经过60 min研磨,圆柱滚子的圆度误差由2.55 μm减小到0.63 μm,形状精度得到显著提升。     

航空自润滑关节轴承的内锥面滚铆工具设计

依据航空标准的规定要求,研究了一种新型的翻边固定的滚铆工具,以实现滚轮纯滚动、表面质量好、对轴承启动力矩影响小的质量目标。根据速度合成定理研究了滚轮实现纯滚动的条件,设计了内锥面的滚轮;以滚铆MS14101-9关节轴承为例,研究了两种滚轮对轴承外圈座圈之间的贴合度、轴承内外圈等效应力、轴向推出力、翻边表面质量的影响;最后,通过虚拟正交试验,以航空标准规定的轴承启动力矩范围为约束,以翻边固定后的轴承内圈外球面位移变化量为优化指标,研究了内锥面滚轮的滚铆工具的翻边载荷和公转转速的参数优化。研究结果表明：内锥面滚轮的工具可实现良好的工艺质量;当翻边工具的翻边载荷4000 N、公转转速200 r/min时,可以保障翻边固定后工艺质量指标和轴承启动力矩在航空标准规定范围内。     

On The Dynamic and Thermal Performance of a Zero Clearance Auxiliary Bearing(zcab) for a Magnetic Bearing System

Structural and thermal analysis of a zero clearance auxiliary bearing (ZCAB) for magnetic bearing systems is presented. The ZCAB consists a series of rollers whose centers are initially placed on a circle. At the open condition all rollers have an initial clearance about the rotating shaft. As the shaft drops on the ZCAB rollers, either due to failure of the magnetic bearing system or a transient shock, the centers of the rollers move circumferentially along a curve path and after eliminate the initial clearance by closing around the shaft and re-centering it. This is known as the closed condition. The overall stiffness of the ZCAB will then depend on the stiffness of each single roller and the initial clearance between the rollers and the shaft. This is affected by the number of rollers that will touch the shaft which will also vary the load applied on the rollers. The low shaft-rollers traction coefficient and overall dynamic support characteristics obviate the possibility of backward whirl, however this traction and the generated heat in the rolling element embedded in the rollers are sources of heat generation. This paper presents the results of a transient analysis for the ZCAB structural stiffness. A preliminary thermal model of the ZCAB and comparison between the predictions and test results are also discussed. Some design guidelines are presented to help improve the performance of the ZCAB in the case of high temperature working conditions.     

Experimental and theoretical investigation of running-in

In this paper, the running-in and steady-state wear in the mixed-EHL line contact problem are analytically and experimentally studied. An experimental apparatus is designed and built to investigate the transient wear process during the initial stage of contact of two rollers with fresh surfaces as well as the contact of broken-in surfaces, when wear rate becomes steady. Seven experiments are conducted with five running-in experiments on fresh rollers and two steady-state experiments on the run-in rollers. The results of experimental tests and a series of simulations of an analytical model that uses the load-sharing concept and accounts for plastic deformation of asperities during the running-in stage are presented. The comparison of experimentally measured wear weight, wear depth, surface roughness, friction coefficient, and surface temperature of these seven experiments are shown to be in good agreement with the simulation results.     

The role of spherical particles as friction reducers in sliding contact

Micron-sized spherical particles in sliding contact are found to reduce the static coefficient of friction, as with the case of larger-sized balls and rollers in bearings.     

喷水减温阀离心喷嘴雾化性能的优化研究

为了探索喷水减温阀喷嘴结构参数变化对其雾化效果的影响,优化喷嘴结构参数,根据Fluent软件VOF模块对喷水减温调节阀的离心喷嘴进行气-液两相仿真分析。以喷嘴出口直径、旋流槽倾斜角、旋流室收缩角作为优化因素,以雾化锥角、流量系数作为雾化性能的评价指标,进行正交实验设计。基于响应面法建立雾化锥角和流量系数的代理模型,再运用粒子群优化算法对代理模型进行寻优,得到一个最优结构参数。结果表明:当出口直径为2.55 mm,旋流槽角度为40°,旋流室角度为110°时,雾化性能得到最优,雾化锥角比原模型增大17.7％,流量系数增大32.53％,为喷嘴的设计提供了一个新的方案。     

Influence of the size,geometry, and material of the rollers on EHD traction

The influence of the parameters relating to the rolling elements on traction in EHD contacts is experimentally studied on a two-roller machine, in which experiments with point contacts are conducted for two paraffinic mineral oils, a synthetic naphthene, and a synthetic ester. Firstly, it is shown that the same traction curves are obtained in both internal and external contacts when the effective radius in rolling direction of the rollers is equal. The effect of an increase in the size of the rollers is to increase the film thickness and this results in a gentle decline in the maximum traction coefficient. As the effective radius in transverse direction is increased, so the traction decreases for a paraffinic mineral oil, while that for a synthetic naphthene remains constant independent of the geometry of the rollers. Finally, the effect of the material of the rollers is studied, employing rollers made of steel, ceramics, phosphorus bronze, brass, and aluminium alloy. The traction obtained under an identical normal load can be arranged according to the effective elastic modulus of the rollers for each oil. However, under identical contact pressure the same maximum traction curve is obtained independent of the material, but the decline in traction in the thermal region is slightly steeper with the ceramic than with the steel rollers because of the difference in the temperature rise of the fluid film.