钢丝夹级进模设计

分析了二种钢丝夹的冲压工艺特点，介绍了该零件级进模加工的排样设计，模具结构特点以及关键模具零件的设计制造。     

手柄落料冲孔级进模设计及制造

分析了手柄冲压成形的工艺特点，设计了一副落料、冲孔级进模；介绍了该模具的结构特点、设计思路以及装配和制造中应注意的问题。     

斜槽定子铁芯叠压焊接模

介绍了定子铁芯的制造工艺，把斜槽定子铁芯的扣片结构改为焊接结构，详细介绍了斜槽定子铁芯叠压模的设计要点。     

联接板冲孔落料级进模设计

分析了联接板的三种工艺方案，单工序、复合工序及连续工序，采用冲孔落料连续工艺，能提高工件的尺寸精度及生产率，降低生产成本。介绍了联接板毛坯的排样图、冲压力及压力中心的工艺计算，设计了联接板冲孔-落料级进模的模具结构。     

打火机防风罩多工位级进模设计

分析了打火机防风罩的结构特点及其冲压成形技术难点,叙述了打火机风防风罩级进模冲压工艺及排样,介绍了模具结构设计和制造要点,可为同类零件级进模设计提供参考。     

弹簧片级进模设计制造

通过对零件的加工工艺分析,优化排样设计,使模具能在高速冲压条件下加工;介绍了级进模模具结构及其主要特点、关键部件的设计制造,     

多用启瓶器的模具设计

本设计以提高生产率及材料利用率为出发点,采用两套模具进行该启瓶器的设计：第一套级进模完成冲孔、拉深和落料;第二套模具为楔块式弯曲模,用来完成两次弯曲成形。这样既可以保证较高的材料利用率和生产率,又能够使模具的结构得到简化。     

美的风扇壳体注射模设计与研究

通过对风扇前壳工艺的分析，设计了一模一腔的塑料模具。详细地叙述了模具成型零件的设计与加工工艺过程，浇注系统和其他结构的设计过程，以及模具工作过程。     

微电机端盖板高速连续级进模设计

根据制件的形状和生产要求，对RF-300C系列微电机端盖板的结构及工艺性进行了分析，介绍了一副轴承室深度和内径可调的端盖板高速连续级进模的排样设计和模具结构，分析了它的结构设计特点以及主要零部件的设计和制造；叙述了压凸包、整形、打麻点、落料复位等模具结构在高速连续级进模中的设计方法。实践证明该模具结构可靠，运行状态稳定，制件质量符合技术要求。     

空调器铜翅片专用模具设计与实验研究

通过对热交换器工作环境的分析和对其性能的研究，以铜翅片替代铝翅片既可以提高空调器制冷效率、又可增加防腐蚀能力。在参考国内铝翅片加工级进模研究理论的基础上，设计了铜翅片加工专用模具。整套模具采用子模分立式的设计方案，各凸、凹模采用分开加工方法，使相同结构尺寸的模具具有结构互换性，可降低加工成本且便于维护。同时进行了加工实验，验证了此模具结构的合理性和可行性，且具有“一模两用”的优点。     

组合在金属铆爪上具有自主适应功能定位挡块的设计

带有金属接头的橡胶软管总成产品是汽车十分重要,甚至是关键部件。为使该产品满足设计要求,有时就需对金属接头上铁套的铆合部位实行较为准确定位,同时还需解决因铁套在铆合过程中由于塑性伸长对定位挡块刚性破坏问题。为此,就需要一款能够自主适应铁套在铆合过程中的塑性伸长-组合在金属铆爪上的定位挡块,从而达到以铁套端面为定位基准铆合制作产品之目的。     

复合材料-铝合金碾铆与螺栓连接强度对比分析

通过碾铆连接和螺栓连接对复合材料-铝合金进行了连接实验,对两种连接方式的接头进行了静拉伸测试,对比分析了有无垫片和是否粘接两种因素对接头连接强度和能量吸收的影响。结果表明:添加垫圈后,两种接头的峰值载荷趋于一致,但螺栓连接接头的失效位移高于碾铆连接接头,且其能量吸收值比碾铆连接接头高16.29%,有更强的缓冲吸震能力;引入粘接对两种接头的抗拉伸强度影响不大,螺栓连接失效的峰值载荷略高于碾铆连接,两种接头的失效位移和能量吸收基本相同。     

纤维金属层板铆接损伤机理与预测的研究

纤维金属层板铆接损伤是连接件、被连接件以及铆钉等多个复杂结构的耦合损伤行为。为了预测纤维金属层板铆接损伤行为,采用Johnson-Cook失效准则预测金属层损伤,采用三维Hashin损伤准则预测复合材料层损伤,采用脱层失效理论预测层间开裂,理论预测模型的合理性通过了实验验证。通过损伤预测模型分别考察层板铺层数量、铆接预紧力、铝合金分数和结构几何对纤维金属层板铆接损伤行为及铆接刚度的影响,为FMLs铆接设计提供可行性建议。结果表明:铺层数量的增加加剧了层板自由端层间脱层剥离现象,从而降低了层板铆接强度;铝合金分数的增加能够提高层板的铆接强度,但铝合金分数大于50%时铆接强度和铆接比强度反而下降;预紧力的增大能够延缓纤维和基体的萌生,并且提升铆接刚度,使得纤维金属铆接承受更大载荷;随着横宽径比W/D和纵宽径比E/D的递增,铆接极限强度有所提高,当W/D≥3或E/D≥3时,铆接强度不再明显提高。     

基于FPGA的高精度自动调速步进电机控制器

针对现有步进电机控制器的不足,提出了一种基于FPGA的高精度步进电机控制器方案,实现了速度的自动调节和规划功能.其主控制器MCU设定运行距离、速度、启动速度以及减速距离等变量,该控制器将自动实现步进电机的速度控制和位置控制.     

Effect of die design on die drool phenomenon for metallocene based LLDPE: Theoretical and experimental investigation

The effect of die design on the die drool phenomenon was investigated for metallocene based LLDPE. It has been found that die exit opening and the flared die design can significantly reduce the die drool phenomenon. Moreover, theoretical research has revealed that die drool onset can be explained by the negative/nonmonotonic pressure profile generated inside the die and/or at the die exit region. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

压力容器铆焊工艺生成软件的研究与开发

以V isual FoxPro 6.0作为开发平台,基于一些国家标准,开发出钢制压力容器铆焊计算机辅助部件规划(CAPP)系统。介绍了压力容器CAPP系统的设计与实现方法。     

A study of bubble nucleation in a mixture of molten polymer and volatile liquid in a shear flow field

Bubble nucleation in a mixture of volatile liquid and polymer melt under shear flow conditions was investigated, using a light scattering technique. In the study, a mixture of polystyrene and trichlorofluoromethane was extruded through a slit die having glass windows and bubble nucleation in the flow channel was observed optically. A He-Ne laser was used to illuminate the nucleating and growing bubbles. The light flux scattered by the growing bubbles at a fixed angle was detected by a photomultiplier with the aid of a high-voltage power supply. The bubble nucleating site in the flow channel was located using a computer controlled tracking system, which was designed to move the entire optical system automatically in the three dimensional space, and also had the ability to follow the software control command and cooperate with the data acquisition system. When the site of bubble nucleation was located, the coordinates of this site in the flow channel and the experimental conditions were automatically recorded on a floppy diskette by entering a software command. The pressure profile along the flow channel was measured by pressure transducers, with the aid of a microprocessor-based pressure reading system. It has been found that the site of bubble nucleation varies with the position in the direction perpendicular to the flow direction, which is attributed to the nonuniform velocity and stress distributions in the slit flow channel. The present investigation suggests that bubble nucleation can be induced either by flow and/or shear stress; specifically, flow-induced bubble nucleation is the dominant mechanism at positions near the center of the die opening, and shear-induced bubble nucleation is the dominant mechanism at positions near the die wall. It should be mentioned that the bubble near the die wall may also be generated by cavitation brought about by the surface roughness of the wall and also by thermal fluctuations due to the heat transfer between the metal (die wall) and the mixture of polymer and volatile component. The present study indicates that bubble nucleation in a shear flow field can occur at an unsaturated condition. This is in contrast to bubble nucleation under static conditions, where supersaturation is necessary.     

Development of an ionic polymer–metal composite stepper motor using a novel actuator model

A novel ionic polymer–metal composite (IPMC) actuated stepper motor was developed in order to demonstrate an innovative design process for complete IPMC systems. The motor was developed by utilizing a novel model for IPMC actuators integrated with the complete mechanical model of the motor. The dynamic, nonlinear IPMC model can accurately predict the displacement and force actuation in air for a large range of input voltages as well as accounting for interactions with mechanical systems and external loads. By integrating this geometrically scalable IPMC model with a mechanical model of the motor mechanism an appropriate size IPMC strip has been chosen to achieve the required motor specifications. The entire integrated system has been simulated and its performance verified. The system has been built and the experimental results validated to show that the motor works as simulated and can indeed achieve continuous 360° rotation, similar to conventional motors. This has proven that the model is an indispensable design tool for integrated IPMC actuators into real systems. This newly developed system has demonstrated the complete design process for smart material actuator systems, representing a large step forward and aiding in the progression of IPMCs towards wide acceptance as replacements for traditional actuators.     

Strength prediction of T-peel joints by a hybrid spot-welding/adhesive bonding technique

The need of joining methods that best meet the design requirements has led to the increased use of adhesive joints at the expense of welding, fastening and riveting. Hybrid weld-bonded joints are obtained by combining adhesive bonding with a welded joint, providing superior strength and stiffness, and higher resistance to peeling and fatigue. In the present work, an experimental and numerical study of welded, adhesive and hybrid (weld-bonded) T-peel joints under peeling loads is presented. The brittle Araldite® AV138, the moderately ductile Araldite® 2015 and the ductile Sikaforce® 7752 were the considered adhesives. An analysis of the experimental values and a comparison of these values with Finite Element Method (FEM) results in Abaqus® were carried out, which included a stress analysis in the adhesive and strength prediction by Cohesive Zone Models (CZM) considering failure simulation of both the adhesive layer and weld-nugget. It was found that the Sikaforce® 7752 performs best in the bonded and hybrid configurations. The good agreement between the experimental and numerical results enabled the validation of CZM to predict the strength of adhesive and hybrid T-peel joints, giving a basis for reducing the design time and enabling the optimization of these joints.     

轴流风机核心部件结构的优化设计

阐述了以带轴转子为嵌件,将其与风叶注射成型合为一体,改进了传统的铆压组合工艺,降低了成本、提高了生产率;为消除转子质量的影响,采用静平衡导轨架对纯粹风叶进行静平衡测试,有效避免了转子因素对修模所带来的平衡修正量误判;静平衡架结构简单,其实验结果对于去重法修正平衡量精准可靠。