SWZ型万向接轴螺栓断裂原因分析

介绍了SWZ型万向接轴的结构及特点，通过分析螺栓结构和受力情况，认为接手键槽磨损、接轴运动特性影响螺栓寿命是造成螺栓断裂的主要原因，提出修复磨损键槽、定期更换螺栓、改进加工工艺等解决措施。     

谈轴伸清根槽和铁心台斜键槽

取消电机轴伸清根槽，增加轴肩圆角，消除清根槽引起应力集中的弊端。轴的铁心台平斜键槽以键长中点为中心两头扭斜，改善了槽形、减轻配合零件的啃伤、减轻装压吨位，提高了产品质量。     

轴类工件疲劳裂缝的超声波检测

设备上的各种轴类工件(齿轮轴、飞轮轴、连接轴、主轴等)承受着弯曲、扭转,拉伸、冲击等疲劳载荷,在长期高载荷、高速运转中,极易在轴上的台阶、拐角、键槽、油孔、螺纹等处附近产生疲劳裂缝及疲劳断裂。疲劳断裂是突然发生的脆性断裂,轻者造成停产事故,重者招致机毁人亡的灾难性事故。为了防患于未然,对有关轴类工     

冶金设备超大型壳体、法兰盘、端盖类工件同心圆及圆周等分孔的精密划线工具

超大型机械,例如冶金设备、矿山机械、化工设备、汽轮机、水轮机、发电机、重型机械、大型水泵……等的制造加工经常遇到在大或超大直径的已加工好的壳体、法兰盘、端盖类工件上划同心圆.然后还要划等分孔的工序.大或超大壳体法兰盘、端盖类工件孔或外圆的直径有的几米、十几米,不仅圆心难找,而且也没有大型的划规,本文介绍一种划大或超大型壳体、法兰盘、端盖类工件同心圆及其圆周等分孔的简单方法.该工具具有结构简单,使用方便,划线质量好,效率高等一系列优点.     

细长杆精密加工新工艺

冶金机械修造厂常常要加工二细长杆(轴)类工件(如无缝钢管厂的传动轴)。这类工件的加工难度较大(加工时易产生弯曲变形、锥度和椭圆等缺陷),尤其是精密加工更是老大难问题。为此,作者根据自己多年来的实践经验,从加工设备、工艺、刀具、夹具、附具、切削用量及操作方法等方面进行了改进,成功地加工出高精度和高光洁度的细长杆(轴)。详细地介绍了这一新工艺,可供有关冶金机械修造厂借鉴。     

轴类零件键槽对称度快速检测专用量具

测量轴类零件键槽对称度时,在游标卡尺的游标外测量爪内侧加装一把测量尺,使外测量爪一长一短,在不破坏原游标卡尺精度的情况下组装出的结构简单、精度高、拆装方便、测量快速的这种测量工具,解决了轴键槽对称度无法直接测量的难题,提高了工效。     

轴向角度键槽付的制造工艺方法

介绍了一种加工方法,它通过数控机床在转轴和转臂的一端工艺头上,根据轴向键槽的方向首先加工端面键槽。然而以其为工艺基准,分别加工各自的轴向键槽,其方法能够准确加工转轴和转臂上配对的角度键槽付,避免了装配键槽错位的问题。     

如何加工柔性轴

文章对柔性轴的加工特点进行了分析,针对柔性轴的加工特点并结合应用实例,介绍了在加工柔性轴时,应采取的相应措施,如何正确安装工件及选择刀具材料、切削液和切削参数．     

复杂形状硬质合金刀具金刚石涂层的制备及铣削特性研究

采用热丝化学气相沉积法,以平行布置热丝方式及优化的预处理和沉积工艺,在复杂形状硬质合金立式键槽铣刀表面制备出均匀的微米级金刚石薄膜。通过扫描电镜和拉曼光谱研究了金刚石薄膜的形貌和成分。以高体积分数(65%)SiCP/Al复合材料为工件材料进行铣削试验,对比考察了金刚石薄膜涂层铣刀和无涂层铣刀的铣削特性。结果表明:在相同的铣削用量条件下,金刚石涂层铣刀的铣削力比无涂层铣刀的降低20%~60%;涂覆的金刚石薄膜附着强度较好,有效减轻了刀具磨损,使其寿命提高3~5倍;加工初期,无涂层刀具加工工件表面质量较好,但加工中后期工件表面质量迅速恶化,而金刚石涂层刀具加工工件的表面质量较稳定。     

平键联接两个工艺问题的分析及解决

对平键联接中键槽尺寸的选取以及高精度深内孔键槽的加工进行工艺分析，提出解决措施。     

第二棒材连轧线工艺优化的实践

介绍了棒线厂自行设计和优化第二棒材连轧线的孔型系统、导卫系统和相关的工艺备件参数，使二棒和一棒、高线在最大程度上实现工艺备件共用，减少工艺备件库存和预装工作量20％～30％，同时通过创新车间组建模式和优化生产操作模式，使各岗位人员迅速掌握设备和工艺操作要求，实现快速达产。     

Increase of Process Stability of Sheet Metal Hydroforming due to Feed Back Control

Sheet metal hydroforming of single sheets is a deep drawing process. In contrast to deep drawing with rigid tools, an active fluid medium performs the forming operation. The process is chiefly influenced by the control of the clamping force against the increasing fluid pressure. Although the optimum force‐pressure progression is close to the sealing line, it is initially unknown and dependent on different system parameters. To perform the process at the ideal curve, the system parameters need to be detected online and led back to the feed back control unit. An optical system is used for the detection of the sealing state. The detection system is a CCD‐camera system that allows for the continuous recording of occurring leakages. Acquired data permit the application of different strategies to control the forming process along the sealing line. This paper provides an overview of this developed technology, advantages and problems with regard to the process stability and performance, the parts quality, and recent results comparing control strategies.     

影响拉丝模使用寿命因素分析及改进的措施

通过多年来的实践总结,从拉丝模模芯选用与热装配钢套的精度,拉丝模工作区的几何尺寸设计,拉丝模工作区的加工,拉拔钢丝的质量和润滑方面分析了影响拉丝模使用寿命的因素。通过分析知道要保证拉丝模有很好的使用寿命,就必须要从拉丝模选材、设计、加工等方面综合考虑,从而提高产品质量,降低成本消耗。     

谈如何提高预决算质量及有效控制造价

简要总结编制施工图预算的步骤和经验,指出影响施工图预算准确性的因素,阐述施工图结算超预算的原因,提出有效控制工程造价的方法。     

从施工图预算的角度浅谈工程造价的控制

详细论述了施工图预算的编制方法和依据，以及审核施工图预算的技巧，并从施工图预算的角度对工程造价进行了较为详细的分析，指出合理地进行施工图预算是控制工程造价的重要手段。     

Working memory and individual differences in comprehension and memory of text.

Attempted to determine whether working memory processes measured by the Reading Span Test would be strongly associated with the ability to integrate information from different parts of a passage to infer an idea not explicitly stated in the passage. The study also assessed the influence of working memory processes on ability to encode explicitly stated and inferred information into long-term memory. 29 undergraduates were administered a letter span test and a reading span test. The ability to store and process information in working memory was shown to be positively related to (a) scores on a standardized reading comprehension test, (b) long-term memory encoding and retrieval of explicitly stated text information, and (c) integration of text information for the purpose of drawing inferences. Variations in only the storage capacity of working memory were not related to these measures. It is concluded that the ability to coordinate storage and process functions in working memory may be an important determinant of text processing skill, especially with respect to encoding information into long-term memory. (12 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于B/S的钨矿企业设备与图档管理信息系统的设计与实现

本系统是针对钨矿企业设备与图档管理的特点研究开发的。把备件管理与设备管理相结合,图档管理与设备管理相结合,使企业在设备维修中能快速、精确地查找设备相关的图档和备件,更好地了解设备状况,实施有效和快速维修,提升企业的管理水平和生产效率。     

Reliability of spinal displacement analysis of plain X-rays: a review of commonly accepted facts and fallacies with implications for chiropractic education and technique

BACKGROUND: Current medical, biomechanical, and chiropractic literature indicates that X-ray line drawing analysis for spinal displacement is reliable, with high Interclass Correlation Coefficients (ICCs) found in most studies. Normal sagittal spinal curvatures are being accepted as important clinical outcomes of care; however, just the opposite is taught in many chiropractic college radiology courses. OBJECTIVE: To review the current literature on X-ray line drawing reliability and abnormal static lateral positions. DATA SOURCES: Searches were performed on Medline, Chiro-LARS, MANTIS, and CINAHL on X-ray reliability, normal spinal position, and sagittal spinal curvatures as clinical outcomes. RESULTS: X-ray line drawing analysis for spinal displacement was found to have high reliability with a majority of ICCs in the .8-.9 range. The reliability for determining X-ray pathology was found to be only fair to good by both medical doctors and chiropractors and by both chiropractic and medical radiologists, with a majority of ICCs in the range .40-.75. Muscle spasms, facet hyperplasia, short pedicles and patient positioning errors have not been shown to alter sagittal plane alignment. The sagittal spinal curves are desirable clinical outcomes of care in surgery, physical therapy, rehabilitation and chiropractic. These results contradict common claims found in the indexed literature. CONCLUSION: X-ray line drawing is reliable. Normal values for the sagittal spinal curvatures exist in the literature. The normal sagittal spinal curvatures are important clinical outcomes of care. Patient positioning and postural radiographs are highly reproducible. When these standardized procedures are used, the pre-to-post alignment changes are a result of treatment procedures applied. Chiropractic radiology education and publications should reflect the recent literature, provide more support for X-ray line drawing analyses and applications of line drawing analyses for measuring spinal displacement on plain radiographs.     

提高硬质合金拉丝模寿命的研究进展

如何提高使用寿命是硬质合金拉丝模研究的重要方向.而模芯材质、内孔涂层和内孔结构设计是影响硬质合金拉丝模寿命的重要因素.由于硬质合金拉丝模存在耐磨性较差、寿命较短的缺点,本文从基体材质优化、涂层处理、内孔结构优化三个方向,介绍了提高其寿命的研究进展.通过以下方法可以有效地提高硬质合金拉丝模的使用寿命:低钴超细晶硬质合金,...     

电塑性加工技术及其工程应用

研究了电塑性加工技术在冷拔钢丝领域的应用，探讨了电塑性加工改变冷加工材料性能的机制。试验结果表明，电塑性加工技术，可有效地降低钢丝生产中的拉拔力，降低钢丝的强度，提高塑性。