双金属墙地砖模具的研制

通过大量试验探索了提高墙地砖陶瓷模具使用寿命的途径。试验表明,用双金属材料完全可以取代 Cr12MoV 钢来制造优质模具,其使用寿命为Cr12MoV 钢的两倍。     

数控铣加工模具零件工艺改进策略

分析数控铣加工模具产生误差的原因,提出数控铣加工模具零件的工艺处理方法,提高模具零件加工精度。     

现代冲压模具在机械零件精加工中的应用探讨

对现代冲压模具在机械零件精加工中的应用进行分析。主要分析了现代冲压模具应用优势、现代冲压模具在机械零件精加工中的应用方法、现代冲压模具在机械零件精加工中的应用形式和现代冲压模具在机械零件精加工中的注意事项,希望能为现代冲压模具应用与机械零件精加工技术处理提供参考。     

烟包模具的机械精度要求与维修要点分析

模具是烟包印刷中成形工序的关键工作单元,从结构入手,分析其机械精度要求,探索维修要点,控制维修过程关键参数,达到用好模具、延长使用寿命的目的。     

液压缸常见故障诊断

液压缸是液压机械的主要元件,常因爬行、冲击、推力不足、泄漏、噪声等原因造成液压缸不能正常工作,严重影响液压缸的使用寿命.本文叙述了液压缸故障的判断及处理故障的方法措施.     

压力机模具快速移动台板

在大中型压力机中安装模具,一直被看作笨重、危险、劳动强度大的工作。而汽车工业、机械工业所需模具数量多、尺寸大,吊装次数也多,尤其是模具中心要与压力机中心同心,才能符合压力机的使用要求,延长压力机和模具的使用寿命。为此,笔者设计了一种模具安装快速移动台板,在250t双点压力机上使用。     

渡槽伸缩缝漏水的原因及处理措施

针对宁夏扶贫扬黄灌溉工程渡槽运行中出现的伸缩缝漏水问题,介绍了目前渡槽伸缩缝止水主要采用的结构形式,分析了渡槽伸缩缝漏水的原因及存在的不足之处,介绍了渡槽伸缩缝漏水处理方法及运行管护措施,解决了渡槽伸缩缝漏水问题;有效延长了其使用寿命。     

GCr15钢双细化处理在冷镦模上的应用研究

本文根据螺钉冷镦模的工作条件和生产特点,提出了 GCr15钢双细化处理工艺;研究了预处理及最终热处理工艺参数对组织和性能的影响。未溶碳化物可细化到0.5μm 左右,晶粒细化为10～11级。经双细化处理的 GCr15钢制M3螺钉冷镦模较原 T10A 钢制常规处理者其使用寿命提高2倍。     

模具工业技术的发展动向

本文论述了模具技术所需要的知识结构,国内外模具技术发展现状及动向,我国模具工业发展战略及前景。     

采煤机滚筒截齿失效分析及应对

截齿是采煤机的重要构件之一,其使用性能和使用寿命直接关系着工作面正常回采工作。本文分析了截齿的失效形式和机理,并对其失效造成的影响作了阐述。最后,就提高截齿的使用寿命提出了具体措施。     

潜油电泵泵轴寿命可靠性分析

统计了大庆油田近五年应用的4123套潜油电泵机组，针对248件失效泵轴的寿命进行分布检验分析，验证了其符合威布尔分布规律,并进行了可靠性评定。应用编制的工程软件可计算不同样本下泵轴寿命的概率分布规律，确定其可靠性指标，实现对泵轴使用可靠性的定性分析和定量评定，为进一步开展潜油电泵机组可靠性研究提供必要的基础数据和数据处理手段。     

A Review of: “PROFITABILITY AND ECONOMIC CHOICE” by Paul H. Jeynes The Iowa State University Press 1968 622 pp. $13.50

Semisolid die casting (SSDC) is a newly developed technology to improve the quality of products and to reduce the costs of liquid die casting process. We assessed the gas-induced semisolid process (GISS), which generates a semisolid metal for die casting, in this comparison of the costs per unit between a traditional liquid die casting process and the semisolid die casting process. A process-based costing model (PBCM) was created to estimate the production costs. In principle, the PBCM consists of three submodels: process model, operation model, and financial model. This study indicates that three main factors, namely cycle time, rate of waste, and die life, affected the unit production costs. The production cost estimates decreased by approximately 13% when the process was switched from a liquid to a semisolid one.     

Measuring and managing customer relationship risk in business markets

There have been repeated calls from top management and marketing academics for greater accountability in marketing so that the financial returns of marketing investments can be more robustly evaluated. These are coalescing around the issue of whether or not marketing delivers shareholder value. One promising line of enquiry explores customer lifetime value and the profitable management of these relationships. Although helpful, this approach fails to make the final link with shareholder value since customer lifetime value is still essentially a profit or cash flow measure and does not fully account for customer risk. This paper describes empirical research which explores differing approaches to measuring customer risk and the creation of shareholder value through customer relationship management (CRM). We develop a customer relationship scorecard which proves an innovative tool for managers to use in determining the risks in their customer relationships and developing risk mitigation strategies. The scorecard is then used to forecast retention probabilities, from which a risk-adjusted customer lifetime value is calculated. Both the scorecard and the calculations have an impact on the CRM practices of the customer relationship managers. From a theoretical perspective, an enhanced consideration of customer risk and returns is an important additional step towards demonstrating that marketing creates shareholder value.     

Linking customer lifetime value with shareholder value

The measurement of customer lifetime value has become a key issue for developing and maintaining long-term profitable customer relationships. It plays a significant role in customer acquisition and retention decisions. Given the growing importance of creating value for shareholders, market strategies have to be evaluated by their capacity to achieve this goal. Accordingly, both the acquisition and maintenance of customers must result in superior cash flows and augmented shareholder value. However, little attention has been paid to the link between customer lifetime value and shareholder value. The authors of this paper provide a conceptual framework for linking customer lifetime value to shareholder value. It is argued that customers have to be treated as assets that increase shareholder value by accelerating and enhancing cash flows, reducing cash flow volatility and vulnerability and increasing the residual value of the firm.     

基于隔离和免疫的蠕虫传播模型及稳定性分析

网络蠕虫已经对网络基础设施和因特网服务造成了巨大的影响,为有效防御蠕虫病毒的入侵,提出了基于隔离和免疫的蠕虫传播SEIQV模型。利用SEIQV模型,得到了蠕虫是否灭绝的阈值,并从理论上证明了模型在无感染平衡点保持全局稳定性,在地方病平衡点保持局部稳定性,同时分析了其他参数对模型的影响,为蠕虫病毒的控制和预防提供了理论基础。     

溶剂对荧光喷墨油墨发光性及其他性能的影响

荧光喷墨油墨由溶剂、树脂、荧光粉、助剂等组成,其中溶剂是荧光喷墨油墨的主要组分之一,对其发光性能有着重要的影响。为了探讨溶剂对荧光喷墨油墨发光性能的影响,制备了含有不同溶剂的荧光喷墨油墨样品,测试其荧光强度,计算了油墨样品的荧光量子产率,探讨了油墨样品的荧光寿命。实验结果表明：溶剂对荧光喷墨油墨样品的发光强度和荧光量子产率影响很大,对荧光寿命影响较小;同时,当其他组分固定不变时溶剂的表面张力和黏度直接影响着荧光喷墨油墨的表面张力和黏度。     

基于RP技术的模具快速制造

快速原型(RP)技术是20世纪末在制造业领域诞生的一门高新技术,该技术将计算机辅助设计(CAD),计算机辅助制造(CAM),计算机数字控制(CNC)、精密伺服驱动和新材料等先进技术集于一体。作为一种新颖的加工方法,该技术已经受到工业界的高度重视。本文阐述了RP的工艺原理、特点及其在模具制造中的应用,并就各种快速制模方法进行了比较,指出了RP在模具制造中的应用前景。     

用神经网络对开式冷挤压极限变形程度的预测

给出了基于 BP网络的极限变形程度预测的分析方法 ,得到了开式冷挤压εmax神经网络计算结果 ,与实验结果比较 ,其精度较高 ,证明了神经网络模型在开式冷挤压工艺中应用的可行性。