混炼硅橡胶的配合技术(四)

介绍了几种胶辊用混炼硅橡胶的配制,包括低硬度胶辊用混炼硅橡胶、低环硅氧烷含量的胶辊用混炼硅橡胶、送纸胶辊用混炼硅橡胶及工业胶辊用混炼硅橡胶的配制。     

Investigation of TiAlN coated roller burnishing on Al-(B4C)p MMC workpiece material

Burnishing avoids the need for super finishing operations after the conventional turning process, to enhance the surface quality. This paper deals with the surface modifications of Al(B₄C)_p Metal Matrix Composites (MMC) workpiece material after burnishing with a TiAlN coated WC roller. The burnishing speed, lubrication type, burnishing passes, and coating were the input parameters. Surface hardness and roughness after the burnishing were studied. It was found that the coating on the WC roller had enhanced the hardness in the workpiece after burnishing in the case of Al-5?wt.% (B₄C)_p, under all conditions. The effect of the coating on the work piece surface hardness was not significant with Al-10?wt.% (B₄C)_p. While burnishing Al-5?wt.% (B₄C)_p, the minimum surface roughness combined with maximum surface hardness was obtained, during the third pass under dry condition using uncoated rollers. The number of passes to achieve the desired surface conditions reduced, on using coated rollers with kerosene as the lubricant.     

擦窗机悬挂轨道三维结构有限元分析

为探究某擦窗机悬挂结构的合理性,在AIP中创建其悬挂轨道的三维参数化特征模型,并根据轨道的结构、材料和特定工况受力等边界条件,建立悬挂系统的有限元模型,模拟计算2种有代表性的偏栽荷工况受力情况,得到悬挂轨道的三维应力分布、结构变形和安全因数．根据工程设计要求和初步分析结果,在保持边界条件和载荷条件不变的情况下,快速更新轨道结构参数,并通过比较分析确定塔楼悬挂轨道的最佳断面参数．该轨道及其固定间距、滑车滚轮和导向轮等构件均满足设计安全要求．     

面向薄带传输的电磁驱动纠偏辊数字控制设计与实验

描述了一种基于DSP、CPLD及计算机串口通信,针对薄带传输过程中出现的跑偏问题的电磁纠偏数字控制系统,并在理论分析基础上通过实验验证了该系统运行可靠、纠偏控制精度高。为电磁纠偏辊的进一步发展奠定基础。     

A research on the contact stress of roller bearing based on crowning analysis

According to elastic contact theory,contact model between roller and race is established.Compared with the Hertz results,the results are proved,based on which contact stress distribution of different crowning and initial contact length is given,then the appropriate value is derived.On the basis,inertia force and different radial force is given into consideration.Via analysis,it concludes that under balanced pure radial load condition the largest contact stress between roller and race increases along with crowning value increasing.With the same crowning value,the largest contact stress between roller and race decreases in the first and increases at the end along with initial contact length increasing.Contact stress between roller and outer race increases along with revolution speed increasing.     

收卷张力控制系统的设计与实现

以某载带生产线为例介绍一种收卷张力控制系统。首先介绍了收卷部分机械结构,介绍了张力传感器——跳舞辊的基本原理;接着提出一种新的张力闭环速度控制模式,分析其控制结构,其PID控制算法采用速度式PID算法,最后给出了启动和停止时的控制曲线。     

Φ840 mm自动轧管机回送辊的研制

介绍了Φ840mm自动轧管机回送辊的工况条件,该轧辊成分选择原则、铸造工艺、球化孕育处理工艺等。研制出的自动轧管机回送辊综合指标符合GB/T1504—91标准,轧辊的强韧性、耐磨性好,达到同类产品较好水平。     

中厚板热矫直机压下模型

矫直机压下模型主要由入、出口矫直辊的压弯量设定和矫直辊的弯辊量设定组成.根据梁的弹塑性弯曲理论,矫直辊的压弯量应该由作用在板材上的反弯挠度来确定,即通过确定弹复挠度、残余挠度而得到反弯挠度,从而得到矫直辊的压弯量;矫直辊的弯辊量由最大原始曲率及入口板件厚度的塑性变形层深度来确定.研究结果表明计算值与实际设定值较吻合.     

连铸小方坯辊道热送热装工艺优化

介绍了唐钢二炼钢从5号连铸机到棒材二车间辊道直供铸坯的生产实践，以及通过采取一系列技术措施，优化热送热装工艺，取得的显著效果。     

轧辊堆焊的研究

阐述了钢轧辊堆焊技术的发展状况和轧辊自动埋弧堆焊工艺,并针对27Cr3Mo2MnVWTi、3Cr13、35MnSi、及3Cr2W8V等堆焊材料的堆焊工艺、焊后热处理制度和焊后堆焊层的化学成分、稀释规律、显微组织、硬度、耐磨损及力学性能等,进行了试验研究和理论分析,提出了4种堆焊材料的适应性.