螺杆轴向振动挤出成型装置的设计及振动特性仿真

首先,提出了一种新型的机械式螺杆轴向振动挤出成型装置,分析了螺杆轴向振动的工作原理;其次,基于包络线理论,导出了凹凸激振曲面的数学模型,据此建立了螺杆轴向振动挤出成型装置的三维模型;然后,基于受力分析,建立了螺杆轴向振动物理模型,并对关键参数的求解进行理论推导;最后,运用ADAMS软件对螺杆轴向振动挤出成型装置的振动特性进行动力学仿真.仿真结果表明,该振动挤出成型装置的振动波形符合规定的简谐振动规律,波形失真度小,振动较为稳定,说明该装置是可行和有效的.     

A strategy to obtain a high-density and high-strength zirconia ceramic via ceramic injection molding by the modification of oleic acid

Despite its unique high efficiency and good environmental compatibility, the water-soluble binder system still encounters problems achieving a desired sintered part via ceramic injection molding because of the poor compatibility and the powder-binder segregation between ceramic powders and binders. The objective of this study was to obtain a sintered part with excellent properties by introducing a small quantity of oleic acid to the surface of zirconia powders before the mixing process. As opposed to many previous investigations that focused only on the rheological behavior and modification mechanism, the sintering behavior and densification process were systematically investigated in this study. With the modified powders, debound parts with a more homogeneous and smaller pore size distribution were fabricated. Also, a higher density and greater flexural strength were achieved in the sintered parts fabricated using the modified powders.     

双向回流微型自吸泵的研究

本文针对微型自吸泵自吸性能差的缺点,首先采用了双向回流结构,从而大大提高了微型自吸泵的自吸能力,使泵的自吸高度由通常的3～4米提高到7米。文中对双向回流结构自吸原理进行了定性与定量分析,对回流量与储水量的计算及回流量与储水量之间关系的论述,充实了自吸泵设计理论,对指导自吸泵的设计有实用价值。     

国内连续铸造球铁管的现状及发展前景

本文概述了近年来国内连铸球铁管的试制、生产、存在的问题及发展前景。     

容积式机器的概念创新设计方法研究

从三种容积式机器实例出发，分析了此类机械中空间密闭容腔的一般组成原理和形成容积变化的顶层方法。采用图模型对若干典型容积式机器的空间密闭容腔组成和容积变化机理进行了抽象描述，包括容腔构件的运动特征、自由度以及构件之间的共轭运动副特征，并从中归纳出可行的创新途径。创新设计实例证实了上述创新设计原理的有效性。     

火电厂高铬铸铁件的生产及质量控制

介绍了合金元素和显微组织对高铬铸铁性能的影响,高铬铸铁件的生产、质量控制的关键问题及其解决方法.     

连铸坯保温快速输送装置的研制

叙述了国外连铸坯保温输送装置的进展，所研制的保温快速输送装置的概况，以及沈阳钢厂在我国首次实现连铸连轧试生产线的试验状况，试验表明，本装置设计合理，结果简单，安全可靠，使用效果良好，经济效益显著，应当推广应用。