软皮辊纺纱工艺的生产实践

本文针对软胶辊纺纱工艺进行了生产实践和分析，为纺织厂的工艺参数优化提供参考依据。     

ANALYSIS AND DESIGN OF LOAD-UNIFORMING MANGLE ROLLERS WITH AXIALLY-STAGGERED CONTACT

It is desirable to get a uniform load distribution for the pressure rollers of the mangle.In thispaper,the load uniforming principle of the axially-staggered pressure rollers and the rules for theroller design have been analysed by the theory of bending of beams.The ratio of maximum tominimum value of the distributed load in the nip being taken as a useful index to describe the uni-formity of the load distribution,the performance of the so-called load-uniforming pressure rollerswith rubber covering,under various operation conditions,has been evaluated.As a result,it isproved that the load-uniforming pressure rollers with axially-staggered contact is a pratically use-ful means of uniformizing the load distribution,which ensures that the mangle will squeeze the ma-terial to be processed uniformly over its whole width under any technological load,and needs onlysome simple regulations.The conclusions obtained in this paper can easily be extended to the pressure rollers with anysupport conditions.     

用钢球滚压器滚压油缸工艺参量的探索

分析了钢球滚压器对工件的滚压过程 ,阐述了滚压的工作原理 ,并通过分析建立起滚压油缸的工艺参量的数学公式     

Study of Stress and Strain Distributions of First Pass Conventional Spinning Under Different Roller-trace

Based on simplified axisymmetrical forming model, a elasto-plastic FEM simulation system of multi-pass conventional spinning is developed. Taking the typical draw-spinning as the study object, and establishing reasonable mechanics model, research on the first pass of spinning process is carried out with FEM system developed. The distributions of the stress and strain are obtained by three types of roller-trace curves: straight line, involute curves and quadratic curves. The results are as follows: (1) The v...     

RCC Arch Dam Structure on the Taxi River and Water Storage Measure During Construction

IntroductionThe Taxi River Hydraulic Project is located in theShimen Gorge section in the middle section of theTaxi River in Manasi County,Xinjiang UygurAutonomous Region.The gorge is about3 5 0 mlong with a U- shape and is about70 80 m wide atthe bottom.…     

浅谈皮带机自移机尾螺旋滚筒的密封设计

介绍了ZY2700型皮带机自移机尾及螺旋滚筒在实际使用过程中存在的问题,并对螺旋滚筒的密封结构进行了优化设计,使其能得到较好的密封效果,从而保证螺旋滚筒长时间正常使用,自移机尾正常运行。     

滚轮滚压光整效果与滚压量关系的解析分析和试验验证

将滚轮滚压加工过程视为平面应变力学情形,利用Boussinesq-Flamant问题的求解根据Von Mises屈服准则得出了滚压局部发生微塑性变形的区域,根据Hertz接触理论得出了滚压接触压力分布,得出了滚压过程中工件和工具的应力分布.考虑零件的粗糙表面形态,得出了构成滚压量的各因素如机床变形,滚压工具变形,工件整体变形,工件滚压局部基体塑性变形和弹性变形以及粗糙表面变形的滚压力参数方程,然后根据参数方程得出了滚压光整效果与滚压量的关系.就单滚轮式外圆滚压和复合滚柱式内孔滚压两种最典型的滚压形式对预测结果与试验结果进行了对比,证明了推理假设和公式的有效性.     

圆柱滚子轴承的刚度计算

针对基于Hertz接触理论的轴承刚度计算方法在实际应用中存在较大局限性的问题,通过实验方法建立基于超声波的油膜刚度测试模型,并运用现代微观理论建立了滚子轴承的接触刚度分形模型,推导出油膜刚度和接触刚度与径向载荷的关系。研究分析表明随着径向载荷的增加,油膜刚度和法向接触刚度不断增大。为证明该方法的有效性,运用所建立的模型对某型圆柱滚子轴承进行实例分析,计算得出该滚子轴承的径向刚度。结果表明:油膜刚度与径向载荷成线性关系,随着径向载荷的增大,法向接触刚度增长速率变缓。     

辊压方式对圆锯片稳定性的影响

采用有限元法研究新的适张方法对圆锯片稳定性的影响.新适张方法为径向辊压和切向辊压,通过与环形辊压比较来研究其对圆锯片稳定性的影响.研究结果表明径向辊压产生的应力状态不利于提高锯片的稳定性,同时锯片辊压后平整性差,受轴向载荷作用时,端面变形量大;而切向辊压在锯片上形成的应力状态利于提高锯片的稳定性,同时锯片辊压后平整性好,受轴向载荷作用时,端面变形量小.结果证明切向辊压效果明显,是一种有效的辊压方式.     

高压辊磨机操作因素对粉碎产品粒度特性的影响

采用高压辊磨机破碎贫赤铁矿,分别研究了辊面速度、辊面压力、矿石含水率等操作因素对中料和边料产品粒度特性的影响.结果表明:增加辊面压力,中料和边料产品粒度变细,中料产品粒度分布更加集中,边料产品粒度分布更加均匀;提升一定的辊面速度,中料产品粒度变细,粒度分布更加集中,继续提升辊面速度,中料产品粒度特性无明显变化,辊面速度变化对边料产品粒度特性影响不明显;提高给料矿石的含水率,中料和边料产品细度变化不明显,中料产品粒度分布更加集中,边料产品粒度分布更加均匀.