解读上海滩花园

在上海新城市空间的变革中,“老南市”的空间再造成为一道连接过去记忆和未来畅想的时空走廊。作为“黄浦江沿岸综合开发计划”的一部分,华润置地上海滩花园在上海住宅建筑的历史舞台上,怎样在厚重的文化积淀中重新诠释精英文化,诠释商业开发和文化传承的并行模式,成为一种超越设计的独特现象。     

Numerical simulation of friction stir-assisted incremental forming with synchronous bonding of heterogeneous sheet metals

Friction stir-assisted incremental sheet forming with synchronous bonding is developed as a novel variant of incremental sheet forming, by which the two sh     

Influences of gap pressure on machining performance in radial ultrasonic rolling electrochemical micromachining

Microdimples as a typical surface texture has been widely used for improving the properties in tribology and heat transfer fields. Ultrasonically assisted     

Experimental research on the MRR of ultrasonic vibration aided electric discharge milling of ceramic materials using deionized water as processing medium

Abstract

Electric Discharge Milling Machining (EDMM) simplifies the electrode manufacturing process and reduces the cost. However, the introducing of new parameters, such as the three-dimensional motion and the electrode rotation speed, results in a periodic change of control state that can reduce the control performance and processing efficiency. In this work, ultrasonic vibration of tool electrode was used to improve the processing efficiency of ceramic materials. The effect of ultrasonic vibration on the EDMM process was analyzed by comparing the experimental findings. The results have shown that the ultrasonic vibration can improve the material removal rate, and a treble processing efficiency was achieved. The effect of processing parameters on the material removal rate, such as the open voltage, the peak current, the pulse during time and the pulse off time, was analyzed. When aided with the ultrasonic vibration, the best processing efficiency was achieved at 220?V for the open voltage, 10?A for the peak current and 15?μs for both the pulse during time and pulse off time.     

薄壁弱刚性钛合金结构件制造工艺

随着新型材料冶金技术的发展与进步,钛合金作为“崛起的第三代金属”已完全替代了铝镁合金和钢构件,成为航天飞行器上应用范围最广的材料之一。从某新研制航天飞行器外部结构件用钛合金材料的特性及切削特点入手,针对薄壁弱刚性钛合金结构件在实际加工过程中遇到的诸多难点,提出了相应的解决办法,并重新设计了零件工装。结果表明,改进措施不仅保证了零件质量,而且提高了零件加工效率,使单件零件的生产周期缩短了近10h。     

Box-Behnken试验设计法分析激光诱导金刚石石墨化后材料去除深度研究

金刚石的加工制备一直以来被学术界和工业界高度关注。针对金刚石的高效去除方法——激光加工,研究激光参数对金刚石去除量的影响,并采用Box-Behnken试验设计法建立金刚石去除深度与各激光参数之间的拟合关系式,实现金刚石激光加工的可控去除及预测。     

45号钢垫圈断裂的原因分析和改进措施

针对45号钢垫圈在装配后发生断裂的情况,对45号钢垫圈进行断口形貌分析、力学性能分析、化学成分分析和金相组织分析。宏观形貌显示内孔存在加工台阶和明显刀痕,能谱测试发现断裂起始处存在锌元素,金相组织分析确认内孔加工面存在微裂纹。结合加工工艺分析,确认45号钢垫圈的断裂原因,并提出改进措施。     

努力适应新形势 积极迎接新挑战──论当前房地产市场的现状与发展

本文在分析当前房地产市场现状的基础上,探讨如何注重居住环境的品质;优化户室结构的多种类型;积极发展小高层建筑;塑造别致独特的形象;留意住宅建设的可持续性发展。     

铝纤维吸声板的材料

铝纤维吸声板是一种新型吸声材料。具体介绍其吸声特性、物理和力学性能、耐候特性及耐腐蚀性。该材料特别适合高温、潮湿以及露天声屏障中使用。