Study on Factors Affecting Springback and Application of Data Mining in Springback Analysis

Springback of sheet metal induced by elastic recovery is one of major defects in sheet metal forming processed. Springback is influenced by many factors including properties of the sheet material and processing conditions. In this paper, a springback simulation was conducted and comparisons between the results based on different processing variables were illustrated. The discovery of knowledge of the effects of geometry and process parameters on springback from FEM results becomes increasingly important, as the number of numerical simulation has grown exponentially. Data mining is an effective tool to realize knowledge discovery in simulation results. A datamining algorithm, rough sets theory (RST), was applied to analyze the effects of process parameters on springback in U-bending.     

增压柴油机使用要点

增压柴油机与自然吸气柴油机在日常使用中的区别主要是：要确保增压器转子轴承的压力润滑。增压器的转子组件，在工作时的额定转速高达每分钟十万转以上，在这样高的转速下，任何滚动轴承已无法正常工作。所以，增压器所采用的是用压力油把转轴托浮起来的液压轴承。保持一定压力的润滑油，在特殊设计的轴承压力室中，产生一个向中心的力，保持轴与套不产生金属接触磨擦。     

一种快捷简便的磷化处理测试方法

根据磷化膜的形成的电化学原理，通过测量磷化过程的电势与时间曲线，探索了磷化液线元和工艺参数对成膜过程影响的快捷简便的测试方法。     

金属内部近表缺陷深度的定量化检测新方法

通过对脉冲加热红外热成像无损检测的一维理论模型及实验结果的研究给出了一种估测金属材料内部近表缺陷深度的新方法，并给出测试结果。     

金属催化臭氧化预处理含酚农药废水的研究

含酚农药废水由于其具有较强杀菌能力，在自然界中直接生物降解较难。采用TiO2,NiO,MnO2金属催化臭氧化预处理含酚农药废水，提高其可生化性。研究表明：TiO2,NiO,MnO2金属催化臭氧化可提高农药废水的COD去除率。当TiO2含量为1.5g/L，反应时间为1h，COD去除率为75．2％，BOD5／COD值由开始的0．18升至0．32。另外，溶液的pH值，臭氧含量等因素对农药废水COD去除有影响，当pH为9．5，臭氧含量为13．63mg/L，反应时间为1h,COD去除率为64．3％。     

超临界流体技术用于能源、环境和电子学的新进展——第四届超临界流体技术用于能源、环境和电子学国际会议简介

1大会概况 “第四届超临界流体技术用于能源、环境和电子学国际会议”（The 4^th International Syrnposlum on Supercritical Fluid Technology for Energy，Environmeht and Electronics Applications）于2005年11月20至23日在中国台北市台湾大学召开。本次大会由台湾大学、台湾超临界流体协会、台湾金属工业研究发展中心和台湾工业技术研究院环境与安全卫生技术发展中心主办；同时得到了台湾清华大学、逢甲大学、义守大学等方面的大力支持。     

陶瓷/金属梯度热障涂层圆筒的传热与热应力有限差分分析

推导了多层陶瓷梯度涂层圆筒模型的温度和热应力分布，对变物性材料的差分解法进行了分析，并与实际的工程模型进行了对比计算，有限差分解和有限元解能够很好地吻合。     

Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding

Powder segregation induced by mold filling is an important phenomenon that affects the final quality of metal injection molding （MIM）. The prediction of segregation in MIM requires a bi-phase flow model to describe distinctly the flows of metallic powder and polymer binder. Viscous behaviors for the flows of each phase should hence be determined. The coefficient of interaction between the flows of two phases should also be evaluated. However, only viscosity of the mixed feedstock is measurable by capillary tests. Wall sticking is supposed in the traditional model for capillary tests, while the wall slip is important to be taken into account in MIM injection. Objective of the present paper is to introduce the slip effect in bi-phase simulation, and search the suitable way to determine the viscous behaviors for each phase with the consideration of wall slip in capillary tests. Analytical and numerical methods were proposed to realize such a specific purpose. The proposed method is based on the mass conservation between the capillary flows in mono-phase model for the mixed feedstock and in bi-phase model for the flows of two phases. Examples of the bi-phase simulation in MIM were realized with the software developed by research team. The results show evident segregation, which is valuable for improving the mould designs.     

涡流检测中金属内部磁场测量的研究

根据涡流试验相似律，研制一种金属内部磁场的测量装置。研究结果表明，该装置的磁场测量值与理论计算结果有较好的一致性。