自硬砂铸造工艺技术及装备的研究和应用

本文介绍了自硬砂铸造生产中砂处理工艺特点及相关工艺装备的技术特征.在其基础上研究设计适用于不同自硬砂铸造生产要求的工艺方案和工艺装备.其目的提高铸造砂处理再生能力,降低成本、促进环保、提高资源再利用.     

V法与消失模铸造生产线

对V法铸造与消失模铸造进行了比较,介绍了这两种铸造方法的异同点:介绍了生产中选择这两种铸造方法的原则;介绍了这两种铸造方法所选铸造工艺装备以及生产线的布置方案.对生产实践有一定指导意义.     

铸造工艺装备建设

阐述了铸造工艺装备分类,铸造工艺装备准备过程,论述了铸造工艺装备在铸造生产过程中的重要作用,并针对铸造工艺装备准备存在的问题提出了对策和建议。     

铸造工艺装备建设

阐述了铸造工艺装备分类,铸造工艺装备准备过程,论述了铸造工艺装备在铸造生产过程中的重要作用,并针对铸造工艺装备准备存在的问题提出了对策和建议。     

用树脂砂生产转轮

作者论述了对冲击式水轮机转轮的技术要求,铸造工艺方案的制定和操作要点。提出了采用呋喃树脂砂组芯造型新工艺,辅以保证尺寸精度的工艺装备和合理的操作方法,最后生产出达到国际先进水平的优质转轮。     

薄壁ZL114A铝合金锥件的铸造工艺改进

ZL114A铝合金材质的锥件属于细长型薄壁铸件,采用熔模铸造工艺生产。针对原铸造工艺方案容易出现缩松和夹渣问题,进行了工艺改进,通过浇注系统凝固顺序模拟及采用真空浇注等措施,找到了一种可行的铸造工艺方案。生产结果表明,该工艺方案解决了铸造中出现的缩松、夹渣缺陷,生产出优质的薄壁ZL114A铝合金锥件。     

破碎机定颚的铸造生产工艺

分析了定颚铸件的结构特点和工艺难度,依据理论知识并结合实践经验,确定铸造工艺方案和铸造工艺参数,通过加强工序质量控制,最终生产出高品质的合格铸件。     

移动式冷床主摇杆的铸造生产工艺

通过对移动式冷床主摇杆铸件结构分析,找出铸造难点,依据理论知识,并结合实践经验,确定出合理的铸造工艺方案和铸造工艺参数,通过加强质量控制,最终生产出高质量的合格铸件,该工艺对同类铸件的生产有一定参考价值。     

中华人民共和国标准 铸件名词术语

6．工艺设计及工艺装备6．1工艺设计6．1．1铸造工艺设计mold design根据铸件结构特点、技术要求、生产批量、生产条件等,确定铸造方案和工艺参数,绘制图样和标注符号、编制工艺卡和工艺规程等。     

石油装备钩体的铸造工艺改进

钩体属于石油装备关键零部件。针对原工艺容易出现的严重缩松和夹渣问题,根据生产经验,提出三种工艺改进方案,借助计算机模拟技术,找出了一种合理的工艺方案。实践表明,该方案不仅解决了缩松、夹渣问题,而且铸件质量稳定。     

Design and Development of High-Velocity Slurry Erosion Test Rig Using CFD

Slurry erosion (SE) is commonly observed in almost all kinds of components and machineries involved in fluid (liquid) transfer and delivery. During design and development phase of these components, test rigs are usually required to evaluate their performance; however, only few detailed designs of test rigs are available for SE investigations. Among the existing designs of SE test rigs, most of them belong to rotary type. In the present study, design of a new type of SE test rig has been proposed, which is simpler in construction and working. This newly designed test rig could possibly eliminate some of the limitations (velocity-concentration interdependence and lack of acceleration distance) found in the existing set-ups. Calibration of the test rig was done for jet velocity and erodent concentration. Commissioning of the rig was undertaken by evaluating the effect of operating parameters (concentration and impingement angle) on the erosion rates of aluminum and cast iron. Results show that the rig was able to capture the traditional responses of ductile and brittle erosion behaviors being observed for these materials. Repeatability of the test rig was ensured, and the results were found to be within the acceptable error limits.     

FeNi合金镀铁缸套的摩擦磨损性能

采用对置往复式摩擦磨损试验机,选用CKS活塞环为配副,以摩擦因数、磨损量、断油摩擦时间为表征参数,以BP合金铸铁缸套为参照对象研究FeNi合金镀铁缸套的摩擦磨损性能,探索FeNi合金镀铁缸套的磨损机制。逐级加载的磨损试验表明:FeNi合金镀铁缸套的摩擦因数较BP合金铸铁缸套增大11%~20%;而磨损量则降低了11%;贫油试验表明两种缸套拉缸时间均随载荷增大而缩短,在40 MPa时FeNi合金镀铁缸套的拉缸时间较BP合金铸铁缸套延长了约6.5倍。与BP合金铸铁缸套的磨损机理为基体碾压平台在反复接触应力作用下脱落,以及犁削/切削形式的磨粒磨损不同,FeNi合金镀铁缸套的磨损机理主要是网状裂纹周围镀铁层的疲劳剥落。     

铸件三维有限差分网格剖分技术研究

在分析三维STL文件格式数据结构的基础上，详细介绍了网格剖分技术。在处理奇异点方面采用了合理的方法来避开，所生成的三维直角六面体网格为金属凝固数值模拟采用有限差分法计算提供了铸件和铸型实体的空间位置信息，并给出适用于任意复杂铸件形体的三维网格剖分程序，通过实际应用证明了程序的实用性。     

铸造镍基合金K-3的热腐蚀及防护研究

用光学显微镜、X 光衍射、扫描电镜、能谱分析和化学分析等多种手段,对经热腐蚀后的K-3合金试样及渗铝的 K-3合金涡轮叶片进行了分折研究。结果表明叶片失效的原因是硫化及熔盐引起的热腐蚀;低铬、富难熔金属的 K-3合金的热腐蚀机制是硫化、碱性熔解和酸性熔解的综合作用。用 RFL 燃气腐蚀装置对不同的保护涂层进行抗热腐蚀性能的对比试验表明:渗铝的防护效果并不理想,而富硅的扩散型和融烧型料浆铝硅涂层则具有良好的抗热腐蚀性能。     

球墨铸铁微观组织形成过程数值模拟研究

基于球墨铸铁发生固态相变之前的热动力学和凝固原理建立了数值模拟的物理数学模型,提出局部单元替代放大算法,并编制程序对试样进行了数据模拟计算。得到的计算结果与试验值吻合得较好。同时,编制程序对微观组织的形成过程进行了二维动态显示。     

An Analysis of Selected Properties of ZA Alloys

Zinc-aluminum (ZA) alloys are a relatively new family of zinc foundry alloys having superior melting and casting characteristics and attractive mechanical properties. The ZA-8 and ZA-12 alloys are moderate to high strength materials while ZA-27 is a high-strength alloy. All can be sand cast, permanent molded and pressure die cast. An extensive characterization program is being implemented to develop appropriate and reliable engineering data for designers. Property development in all aspects of ZA metallurgy is welladvanced. The data available on selected physical and mechanical properties of ZA alloys is compared here with the properties of traditional casting alloys.     

ZL201铝合金底板铸造工艺和性能研究

在普通红砂湿型、手工造型条件下,确定了合理的铸造工艺方案,铸造出合格的ZL201铝合金底板铸件。铸件实现均衡凝固,避免了气孔和疏松的产生。测试了铸件的力学性能并进行了金相组织观察,铸件的力学性能Rm=250 N/mm2、A=4%,满足使用要求。     

Cast Maraging Steel Evaluated

The results of a program to investigate 18%-Ni cast maraging steel are presented and discussed. Notched and elevated-temperature tensile tests and fatigue and drop-weight impact tests, in addition to standard tensile and charpy impact tests, were performed on both heavy and light sections. Experiments to identify or eliminate severe embrittlement of cast heavy sections—with suppression of this effect found by extending the homogenizing time at 2100°F— are described.     

A Fractional Factorial Design Study of Reciprocating Wear Behavior of Al-Si-SiC<Subscript>p</Subscript> Composites at Lubricated Contacts

The lubricated reciprocating wear behavior of two composites A319/15%SiC_p and A390/15%SiC_p produced by the liquid metallurgy route was investigated by means of an indigenously developed reciprocating friction wear test rig using a fractional factorial-design approach. The main purpose was to study the influence of wear and friction test parameters such as applied load, sliding distance, reciprocating velocity, counter surface temperature and silicon content in composites, as well as their interactions on the wear and friction characteristics of these composites. Two output responses (wear loss and coefficient of friction) were measured. The input parameter levels were fixed through pilot experiment conducted in the newly developed reciprocating friction and wear test rig. The counter surface material used for the wear study was cast iron having Vickers hardness of 244 HVN. It had been demonstrated through established equations that A390/15%SiC_p composite is subjected to low wear compared to the A319/15%SiC_p composite. The experimental results indicate that the proposed mathematical models suggested could adequately describe the performance indicators within the limits of the factors that are being investigated. The applied load, sliding distance, reciprocating velocity, counter surface temperature, and silicon content in composite are the five important factors controlling the friction and wear characteristics of the composite in lubricated condition. Moreover, the two factor interactions have a strong effect on the wear of composites. The results give a comprehensive insight into the wear of the composites.     

天然气纯氧回转化铁炉的应用

总结了天然气纯氧回转化铁炉在减少铁烧损和提高炉衬寿命等两方面的技术进展和经验,包括通过提高天然气的加热功率、造稀渣以减少铁烧损的经验,包括采用中性耐火材料、严格执行筑炉和烘炉的工艺规范、提高炉衬烧结温度、控制炉膛温度、优化加热程序等以提高炉衬寿命的经验,同时介绍了笔者公司所研制的回转炉在灰口铸铁机床床身、球墨铸铁管件、...