注塑成型省喷涂显示器前框

论述从模具设备到成品加工过程中，实现省喷涂显示器前框塑料件的技术条件，并着重讨论了各工艺因素对产品质量的影响。     

阻燃聚烯烃注塑料的研制

研究了几种常用阻燃剂在聚丙烯（PP）、聚乙烯（PE）、高抗冲聚苯乙烯（HIPS）等聚烯烃材料的阻燃效果，选择出较佳阻燃改性配方，制得PP、PE、HIPS阻燃注塑料达到GB4609-84中的FV-2、FV-0级要求。     

大口径改型卡氏天线栅状反射面成型工艺研究

主要论述了大口径曲面栅状反射面的结构特点、反射面上高精度线条的制作及其关键制造技术，通过合理的模具设计，运用湿法成型和真空袋压相结合的工艺，成功研制了形面精度高、电气指标一致性好的天线反射体。     

A computer software for PID tuning by new frequency domain design method

A software package has been developed for the PID controller tuning introduced by Wang et al. using new frequency domain method. It is user friendly and is illustrated by two practical examples. The study includes the scope and limitations of new frequency domain design method.     

注射成形钕铁硼粘结磁体研究的现状及前景

论述了注射成形钕铁硼粘结磁体的特点及发展趋势，分析了其生产工艺中的四个关键因素。包括磁粉，粘结剂与耦联剂，注射过程，充磁过程，并对这四个关键因素的研究状况作了综合评述，认为今后对注射成形钕铁硼粘结磁体的研究开发将集中在四个主要的方面。     

Microstructures and degradation of heat sink very-thin quad flat package no-leads Pb-free Sn-Ag-Cu solder joints after thermal aging

Heat sink very-thin quad flat package no-leads (HVQFN) packages soldered with Sn-3.8Ag-0.7Cu on metallized laminate substrates have been put to thermal aging. Temperatures from 140°C to 200°C for times up to 30 weeks were applied. The solder joint microstructure develops intermetallic compound layers and voids within the solder. Due to this, the mechanical reliability of the HVQFN inner lead solder joints is degraded. The intermetallic layers are of the type (Cu, Y)₆Sn₅, with Y=Ni, Au or Ni+Au, as well as Cu₃Sn, and follow a power law with aging time: X=C·tⁿ, where n=0.4 to 1.9 depending on temperature. The voids within the solder are attributed to Sn depletion of the solder in favor of the growth of (Cu,Ni)₆Sn₅. They are more pronounced the less the solder volume is in proportion to the intermetallic diffusion area. The amount of voids is quantified as a percentage of the residual solder. The time to reach the failure criterion of 50%, i.e., t_50%, is related to the absolute temperature according to an Arrhenius equation with an activation energy E_a=0.95 eV. This equation is used for determination of the maximum allowable temperature at a certain required operating lifetime.     

工业决策支持系统的模型库接口的研究与实现

本文详细介绍了工业决策支持系统的模型库接口的两种模式，及如何运用COM组件和ADO软件包实现模型库与数据库系统的接口，并提供了实现过程和主要技术。     

Vent Location Optimization Using Map-Based Exhaustive Search in Liquid Composite Molding Processes

In liquid composite molding (LCM) processes, the resin is injected into the mold cavity, which contains preplaced reinforcement fabrics, through openings known as gates, while the displaced air leaves the mold through openings called vents. Under nominal conditions, the last points to fill are chosen as vent locations. However, due to imperfect preform cutting and placement, gaps and channels may form along the edges and curvatures in a mold, offering a path with less resistance for resin flow. The faster advance of resin through these gaps and channels, a common disturbance known as racetracking, will cause the last filled regions to vary, which complicates the vent selection process. In this study, probabilistic racetracking modeling is used to capture last-filled region distribution over the mold geometry. Success criteria for mold filling are defined in terms of dry spot tolerances, and vent fitness maps, which display potential vent locations, are created. Next, exhaustive search algorithm is coupled with vent fitness maps to determine optimal vent configurations. The map-based exhaustive search is demonstrated on three geometries and results are compared with existing combinatorial search results. The performance of the optimal vent configurations is evaluated in a virtual manufacturing environment. Sensitivity analyses are conducted to determine the influence of optimization parameters on the results.     

Effect of stitching and weave architecture on the high strain rate compression response of affordable woven carbon/epoxy composites

In this study, experimental investigations on stitched and unstitched woven carbon/epoxy laminates under high strain rate compression loading are discussed. Stitched/unstitched laminates are fabricated with aerospace grade plain and satin weave fabrics with room temperature curing SC-15 epoxy resin using affordable vacuum assisted resin infusion molding process. The samples are subjected to high strain rate loading using modified compression split Hopkinson’s pressure bar at three different strain rates ranging from 320 to 1149 s⁻¹. Results are discussed in terms of unstitched/stitched configuration, fabric type and loading directions. Dynamic compression properties are compared with those of static loading. Failure mechanisms are characterized through optical and scanning microscopy.     

Preparation of the Preform of Pure Carbon Reaction Bonded Silicon Carbide by In-situ Consolidation Molding Method

A new kind of in-situ ceramic eonsolidation molding process was imvestigated on the basis of the characteristics of stareh swelling in water and gelutinizing when heuted. The SiC ceramic snspension containing about 50wt% solids loading amt about 3wt% starch can be cast amt molded into various complex-shape SiC ceramic parts in a wuter-thermostat. The dry shrinkage of the green body was less than 1.0% when the solid volume fraction of SiC suspension was up to 52.5% . The density and pore size were homogeneously distributed insule the biscuits. Soaked with melt silicon in a vacuum are furnace, the biscuits were turn into SiC ceramic materiols with homogeneous structure and high performances.