Analysis of Technology Potential of a Metal-based Latent Heat Storage for Backup Process Steam Supply

An analysis of technology potential of a metal-based high temperature latent heat storage for the application of process steam backup for industrial parks in Germany was carried out. To investigate the integration of the storage into a process steam network, dynamic process simulations were performed. Furthermore, the analysis includes ecological and economical calculations for various fuel types of industrial power plants, plant sizes and auxiliary fuels. Basis of all calculations is an extensive research conducted on the industrial parks in Germany with a dedicated power plant and process steam utilization.     

Speed Stroke Grinding of γ-Titanium Aluminides

This paper describes the developments to implement the innovative technology of speed stroke grinding for machining γ-titanium aluminides. These are difficult to cut materials with high application potential in the aeronautics industry. In a first step, a holistic process model is developed, which considers the tool wear and the mechanical and thermal energy balances at high table speeds as well as the crack formation mechanisms. In a second step, the theoretical process model of speed stroke grinding is verified and extended by experimental investigations. In addition to the analysis of the tool wear mechanisms crucial points of the grinding investigations are the analysis of the grinding temperatures and the structure of the workpiece surfaces with special regard to crack and residual stress formation.     

拜耳法助滤剂研制

拜耳法氧化铝生产中。溶出矿浆经重力分离沉降槽液固分离后。溢流溶液中仍然合有一定的浮游物杂质．在分解之前。需要对溢流进行二次净化，以脱除其中的浮游物。国内拜耳法氧化铝厂目前采用的二次净化方法一般是用凯利叶滤机过滤。受溢流溶液的物理化学性质的影响，叶滤机产能常常会受到溢流溶液过滤速率的限制。铝酸三钙既能加快拜耳法溶液的过滤速率，又能降低滤液的浮游物含量。本文论述了合成铝酸三钙的技术条件对其助滤性能的影响。研究表明，合成温度、钙铝摩尔比、碱浓度会影响助滤剂铝酸三钙的粒度分布、晶体结构及组成，继而影响其助滤性能。控制适宜的合成条件。可以制备出助滤性能优良的铝酸三钙。     

HSi80-3硅黄铜船用舵盖铸件精铸工艺的凝固模拟

运用Procast软件对HSi80-3硅黄铜船用舵盖零件在两种浇注工艺方案下的凝固过程进行模拟计算,在此基础上分析探讨了该铸件可能产生缩孔或缩松的部位。模拟显示第一种浇注工艺会在零件主体部位产生严重缩孔,而第二种浇注工艺则能自下而上顺序凝固,避免缩孔或缩松的产生,据此确定了第二种铸造工艺方案,并采用试验进行验证。结果表明,此浇注工艺没有产生技术要求缺陷,证明了凝固模拟的可行性。     

ERW直缝焊管内毛刺清除装置的发展

简述了ERW直缝焊管清除内毛刺的方法及设备构成;重点介绍了内毛刺清除装置尤其是刀架的发展进程,在使用过程中经常会发生的问题及消除方法;同时还指出了未来发展方向。     

耐候钢连铸工艺的改进

分析耐候钢连铸出现的问题,认为凝固时应力过大和磷铜元素偏析造成晶界脆化是出现铸坯纵裂的主要原因;结晶器中喂稀土丝恶化保护渣性能,影响结晶器与坯壳间的润滑与传热,并使热流不均匀是连铸漏钢的主因。采用钙处理代喂稀土丝工艺,以及减缓连铸一、二次冷却强度,改进保护渣后,连铸缺陷获得极大改善。     

冲模模架及装配技术

分析了冲模模型的基本类型，讨论了冲模模架的技术要求，介绍了标准模架的装配工艺，并指出了模架装配时的注意事项。     

激光切割加工中CAPP系统的设计与研究

介绍了一种激光切割加工中CAPP系统工艺数据库设计与开发，该系统可以提供激光切割加工的各种加工方法和工艺参数的选择，实现激光切割工艺标准化，并为智能化工艺设计提供了基础。     

消失模样性能对铝合金液充型速度及间隙压力影响的数值计算

采用计算机模拟技术研究了聚苯乙烯模样汽化潜热及发气性对消失模铸造铝合金液充填速度及金属液／模样间隙压力的影响。结果表明，模样汽化潜热与发气性均严重影响铝合金液的充型速度及间隙压力。