消失模铸造球墨铸铁件收缩缺陷计算机模拟的处理方法

本文主要讨论了初始温度场和铸型硬度对消失模铸造球墨铸铁件收缩缺陷的影响,用计算机数据采集系统测试了消失模和空腔铸造的初始温度场分布。结果表明,两者初始温度场分布仅有微小差别,不同真空度下消失模铸型硬度的测试结果表明,消失模铸型的硬度高于普通湿型砂铸型,并且硬度分布更均匀 ,这一特点可以减少球铁石墨化膨胀引起的型壁移动,根据上述测试,确立了球铁件消失模铸造收缩缺陷的计算机模拟及预测方法,模拟结果与实际生产铸件的解剖结果吻合较好。     

实型铸造技术的研究与发展

介绍了第六届亚洲铸造年会上发表的有关ＥＰＣ发展中的一些理论与实践问题,提出了发展实型铸造技术的一些思路。     

消失模铸造在生产密集小孔平板类铸件中的应用

介绍了采用消失模铸造方法生产带有密集细小孔平板类铸件的工艺方法。实践表明,该法具有独特优越性,生产出的孔板变形小、表面光洁;孔的内壁光滑、棱角清晰。     

ZSF合金抗钻性及复合韧化效果

研究了ＺＳＦ合金的显微组织及其抗钻削性和冲击韧性。结果表明,ＺＳＦ合金的显微组织是奥氏体＋共晶碳化物。该组织的硬度虽不很高（３５ＨＲＣ）却具有很强的抗钻削能力,其主要机制是钻削时加工硬化引起部分奥氏体转变成马氏体。该合金单体结构冲击韧性较低,与韧性好的Ｑ２３５Ａ钢焊接复合后抗冲击能力可明显提高。     

石油化工工程总承包项目中的设备采购管理及其案例分析

介绍了在石油化工工程设计、采购、施工（EPC）总承包项目中,采购部门在供货商的选择和管理、设备的催交和检验等方面应采取的一些做法;对与国外公司合作的某总承包项目的采购管理工作进行了分析。     

试述工程项目管理模式的发展趋势

介绍了国际工程项目管理流行的模式和特点,分析了国内工程公司面临的问题,提出了适应工程项目管理发展要求、创建国际工程公司的建议。     

A note on two process adjustment models

The idea of a process ‘adjustment’ has different connotations depending on whether one is talking from a statistical process control (SPC) or from an engineering process control (EPC) point of view. In SPC an adjustment implies the correction of some problem that has caused abnormal variation. The corrective action usually restores the process mean to a desired or ‘in-control’ level. In EPC an adjustment means the compensation of some observed deviation by manipulating a control variable. This paper analyses two models proposed for process adjustment useful for understanding these and other important differences. One model is based on assumptions common in EPC applications, the other is based on assumptions common in SPC applications. Adjustment policies for each model are presented and contrasted. © 1998 John Wiley & Sons, Ltd.     

Effects of energy performance certificates on investment: A quasi-natural experiment approach

Incomplete information may be one reason why some households do not invest in energy efficiency even though it would benefit them to do so. Energy performance certificates (EPCs) have been promoted to overcome such information shortages. In this paper, we investigate whether EPCs together with mandatory home energy audits make households more likely to invest in energy efficiency. Our study takes advantage of the mandatory nature of the EPCs to avoid the potential selection bias problem that typically applies to studies using voluntary energy audits as the treatment. Our treatment group consists of single-household houses in Sweden sold from 2008, i.e., when EPCs became legally required in connection with sales of residential buildings, to 2015; while the control group consists of houses sold between 2002 and 2008, i.e., without an EPC. The results show that there is no statistically significant treatment effect for most of the measures that a household can take to improve the energy performance of their house. The significant treatment effect that we do find concerns a few heating system-related measures.     

EPC管理模式的可行性分析

分析了我国工程项目管理的现状,阐述了EPC管理模式的可行性,分析了EPC模式的特点及实施EPC管理的要求,并指出了初期改制试点的主要工作,从而进一步完善EPC管理模式。     

覆盖件冲模实型铸造

简要论述了大型汽车覆盖件冲模铸铁件冷硬树脂砂实型铸造生产技术、缺陷分析和改进措施