Axial velocity distribution imparted on thin media transported by layered rolls

An investigation of the axial velocity distribution along a thin media that is transported between flexible rubber-coated rolls is presented. First, a finite element analysis of plane strain static contact between rubber-coated rolls with thin media in the nip is conducted to determine the relationship between coating indentation and normal load. The rubber coatings on each roll are modeled as incompressible, hyperelastic materials using a Neo–Hookean model. Where bearing torque is negligible and the size and angular speed of the rolls is small enough that inertia may be neglected, the static load-indentation relation is a reasonable approximation of the dynamic load indentation relation. Second, a numerical analysis of roll core bending under the applied pinching load is used to determine the axial distributions of load and coating indentation and the deformed shape of the roll axes. In this analysis, the roll cores are modeled as beams and the rubber coatings as springs using the relationship between spring load and rubber coating indentation that was determined in the previous analysis. Finally, assuming steady rolling and a negligibly small slip region in the contact interface, it is expected that the deformation resulting from static indentation at any cross-section is very similar to that for the dynamic loading condition. The deformation from static indentation solutions for various cross-sections along the axis are then used with the known velocity in the undeformed state to determine the average nip velocity at these axial locations. Experiments were used to determine the rolls’ nominal speed ratio as a function of skew angle, as well as to corroborate the numerical results of load and velocity distribution in the nip.     

包装胶辊用聚氨酯弹性体的研制

根据包装胶辊的使用要求选择合适的聚氨酯原材料,考察了合成预聚体中游离NCO含量、后硫化条件、粘合工艺对材料物理机械性能的影响。     

不同类型碳化物在基体中的分布对高速钢轧辊性能的影响

通过对具有不同组织的两种进口高速钢轧辊及一种国产辊环进行冷热疲劳试验及摩擦磨损试验,研究了不同类型碳化物在基体中的分布对高速钢轧辊性能的影响。结果表明,在晶界处分布的大块未溶共晶碳化物周围容易萌生裂纹,且大块的未溶共晶碳化物在经过多次冷热疲劳循环后容易碎裂并脱落,在磨损过程中,大块未溶共晶碳化物同样容易发生碎裂及脱落现象,大大影响耐磨损性能;裂纹容易沿晶界处分布的碳化物扩展,且晶界处分布大块的未溶共晶碳化物或碳化物联结成网状容易促进裂纹的扩展;晶界处M2C型碳化物与晶界成一定角度分布,具有一定阻碍裂纹扩展的作用;不同类型碳化物在基体中的弥散分布对于提高其耐磨性能具有很大作用。     

包装胶辊用聚氨酯弹性体的研制

对包装压花用聚氨酯胶辊进行了研究。根据胶辊的使用要求选择了合适的多元醇材料．并考察了预聚体中游离NCO含量、后硫化条件、粘合工艺对物理机械性能的影响。     

特大水平下调三辊卷板机底座有限元分析

本文采用PRO/E软件对特大型水平下调三辊卷板机底座进行建模,将三维模型导入ANSYS有限元分析软件,对底座进行受力分析和加载模拟,得到底座应力、应变模拟结果,根据模拟结果对底座进行优化设计,从而提高特大型卷板机设备的可靠性和降低其生产制造成本。     

再生塑料改性沥青防水卷材性能测试

按设定的配方制作了再生塑料改性沥青防水卷材并对其进行了评价。提供了再生塑料改性沥青防水卷材的耐热性、低温柔性、渗油性及热老化性能测定方法。     

提高食品饮料罐封口滚轮使用寿命的研究

采用9Cr18马氏体不锈钢制造实罐封口滚轮，在常规热处理工艺中增加预处理（锻造＋球化退火）及深冷处理工艺可有效地提高封口滚轮的使用寿命。     

Three-dimensional FE analysis of ring rolling by employing thermal spokes method

This paper investigates the performance of the “Thermal Spokes Method” in modeling the effect of the guide rolls on the ring rolling process. If the guide rolls are not included FE, simulation encounters problems such as tilting of the ring and process instability. Thermal spokes are introduced to withstand any unwanted moment of the resultant rolling forces at the roll gap and to maintain the ring in a centralized location in the mill. By employing the thermal spokes method, much closer predictions for the lateral spread and flow patterns are calculated. This method is able to predict the tilting of the ring with respect to the stiffness of the elements of the adjustment mechanism. It is also possible by this method to predict the point at which the ring changes its support from one guide roll to another one and to study the deformation mechanism outside the roll gap. To verify the validity of the proposed method, the predicted results from this method are compared with some available references. Since the proposed method considers the effect of the guide rolls and consequently offers much closer predictions, it is a very suitable method for ring rolling simulations.     

包钢薄板厂冷轧工作辊剥落失效分析

对包钢薄板厂5Cr锻钢冷轧工作辊连续发生的剥落事故进行分析,指出了裂纹是导致剥落的根本原因,而轧辊的材质、磨削工艺、检测手段是产生剥落的影响因素,同时针对所存在的问题在配辊管理、磨削制度、检测制度三方面提出了技术改进措施.     

三辊液压定心辊装置

利用特制的双行程液压缸为动力,在无缝管三辊联合穿轧生产过程可实现抱杆、抱管和打开三个动作,完全保证了钢管穿轧过程的轴向抛出管的配合要求.该项技术已在生产实际中稳定运行五年之久,可以在相关机组推广应用.