橡胶胶囊硫化模具的结构设计

以硬质铝合金2A14-T6作原材料设计并制做了橡胶胶囊充气式硫化模具;使用电脑软件ANSYS-Workbench建立了硫化模具热力耦合模型,分析了力学强度、模具厚度和热膨胀变形量并利用相关理论校验了分析结果。结果表明,设计的三个半硫化模具有力保证了橡胶胶囊硫化成型过程中尺寸和厚度稳定;力学强度、模具厚度和热膨胀变形量校验结果符合技术要求;橡胶胶囊硫化模具满足用户使用要求。     

精密压塑模具逆向尺寸设计理论研究

论述了一种基于计算机数值模拟技术的精密压塑模具逆向尺寸设计理论,以快速、低成本地设计出精密压塑模具,并生产出无需二次加工的一次成型制品,同时提高模具开发效率、降低生产成本。本文采用了模拟和实验相结合的研究方法:借助计算机辅助设计和辅助分析软件,模拟了制品生产过程中的模具状态,对理想制品逆向加载成型条件,还原脱模前制品关键尺寸,对模具变形型腔进行拟合、修正,并通过实验验证了该设计思路的正确性。结果表明:该精密压塑模具尺寸设计理论具有可行性和精确性,对实际生产有一定的参考价值。     

三种不同类型注塑模具的特点与发展现状

分析了大型注塑、精密注塑、薄壁注塑的特点,发现由于其注塑工艺不同,对模具的要求也不相同。介绍了大型注塑模具、精密注塑模具、薄壁注塑模具的特点和国内研究现状,指出我国在注塑模具的设计理念、制造工艺等方面与国外还存在很大的差距,需要进一步创新。     

注塑模具冷却系统的关键技术及研究进展

介绍了注塑模具冷却系统的设计,并着重探讨了注塑模具冷却的前沿技术包括脉冲技术、CO2气体冷却技术、随形冷却技术及发展现状。叙述了我国注塑模具冷却系统的研究现状。最后对注塑模具冷却系统的发展前景进行了分析预测,结合现代先进制造方法,降低设计成本,加强理论成果的适用性等成为未来研究者的主要方向。     

保险杠无模脚结构注塑模具设计及校核

介绍一种创新型无模脚结构汽车保险杠模具的设计开发,并同步对该方案进行理论校核,该设计方案可以在保证模具强度及韧性的基础上,有效减重注塑模具2 t以上,降低模具高度200 mm以上。对于大型保险杠注塑模具的开发,有着重要的借鉴意义,目前该设计方案已经量产。     

精密体积成形模具的设计制造与模具寿命

论述了精密体积成形（精锻）模具的寿命与模具设计制造的关系。采用先进设计手段合理设计精密体积成型有件（精段件）、锻压工艺、模具结构，选择模具材料，制定模具钢的段造规范和热处理工艺以及合理确定机械加工工艺及加工精度，可大幅度提高模具寿命。     

基于Pro／E的模具快速设计

以Pro／E为基础，将“mold模具”功能、“Replace替换”功能和“Emx4”模块应用在模具开发过程中，实现了注塑模具的快速设计。免去了一些模具通用件（如导向件、复位支承件、浇口套、定位圈等等）重复绘图工作，使得模具开发周期大大缩短。让模具企业及时提供用户满意的产品，同时可使设计人员节省时间。减少绘图时间。把更多的时间和精力投入到创新设计中去。     

手柄包软胶注射模具设计

通过对手柄包软胶注射模工艺的分析，设计了一模一腔的塑料模具，详细叙述了模具成型零件的设计与加工工艺、浇注系统和其它结构的设计过程，以及模具工作过程。     

模具-产品问题的解决专家

作为一家拥有近40年经验的高端设备制造企业，意大利捷飞特公司在模具和自动化领域处于世界领先地位，可提供多型腔模具、热流道模具、高精度模具、高速模具等诸多塑料模具产品。这些模具大多数都是根据客户的具体要求，融入了独特的设计理念，属于独一无二的非标产品。     

提高耐火砖模具寿命的途径

论述了模具的设计、材料、加工和使用维护等因素对耐火砖模具寿命的影响，指出了提高模具寿命的途径。     

基于流固耦合的错位桨搅拌假塑性流体动力学特性

基于ANSYS Workbench分析平台,采用双向流固耦合计算方法,对错位六弯叶搅拌器）6PBT）和六弯叶搅拌器）6BT）的动力学特征进行了对比分析,根据桨叶与流体之间相互耦合运动特性,探讨了宏观流场的结构和搅拌功耗特性,分析了桨叶的变形和等效应力分布,并对6PBT桨在静态和预应力状态下的模态进行了对比研究。结果表明：同6BT桨相比,6PBT桨叶端部变形量增加了8%,端部应力提高了61%,而根部应力降低了6.7%,应力沿径向呈均匀化分布,这表明错位桨对流体的作用力更大,能够更快地传递能量,同时桨叶强度也得到相应提高;6PBT桨的静模态与预应力模态振型分布一致,在施加预应力后模态频率无明显改变,说明桨叶流场的流固耦合作用和预应力对桨叶模态的影响不大;随转速的增大,6PBT 桨的节能效果显现,体现出错位桨的优势。     

桥式起重机的整形加固

简述采用预应力拉杆加固桥式起重机的原因、加固件的设计计算方法、整形加大工作程序及在其他方面的应用，是一种颇具经济效益而值得推广的技术。     

Flat die geometry—A note

Linearly tapered coat hanger dies or T-dies are widely accepted. Nevertheless a newly proposed curvilinearly tapered coat hanger die has been shown to perform much better. It costs about the same as the other types of dies. This contribution is considered in terms of the recent literature.     

Temperature fields in extruder dies with circular,annular, or slit cross-section

Viscous dissipation causes significant temperature increases in polymers while they are flowing through extruder dies. The development of the temperature field has been studied numerically using the dimensionless parameters Na and Gz. With the annular geometry (parameter: ratio of radii κ) the well known developing temperature fields in capillaries could be compared with the developing temperature fields in an annulus and in a plane slit. The shear dependence of the viscosity is described by a “power law” and the temperature dependence by an exponential function. A simple graphical method is suggested for estimating temperature fields in extruder dies, making use of the fully-developed temperature field for very long dies as a reference state. For the demonstration of results, a power law exponent n = 0.4 has been chosen.     

Pressure drop through tapered dies

A simple method is presented for calculating the pressure drop for the flow of power law liquids in dies with a wide slit profile and with vertical and/or lateral tapers, as well as in dies with the shape of a circular truncated right cone. Tapered dies are known to give improved extrudate quality and/or higher output rates without encountering extrudate defects which occur in dies with parallel channels at similar extrusion pressures. A possible ultimate optimization of the extrusion process—as far as die design is concerned—is discussed. It is suggested that this be based upon an extension of the method from dies with a rectilinear convergent taper to dies with a curvilinearly converging channel aspect the generation of which latter is indicated.     

静压预应力混凝土管桩在工程应用中的研究

针对城市锤击送桩噪音控制,使静压桩得到广泛的应用。为此对静压预应力混凝土管桩的应用情况进行研究,采用静载试验+PDA高应变检测,对常用的φ400、φ500静压预应力管桩,在不同地质条件、不同歇后恢复时间、不同施工控制参数下的极限承载力进行试验研究。经统计分析后提出主要土(岩)层桩的极限端阻力和极限侧阻力指标,并根据工程实际情况,提出静压预应力混凝土管桩施工控制参数、质量检测等要求。     

Improved interfacial surface generator for the co‐extrusion of micro‐ and nanolayered polymers

Two dies for polymer co‐extrusion layer multiplication are evaluated experimentally and computationally in terms of pressure drop and layer uniformity. The first design is that of the original die, is compact, and has successfully been used to co‐extrude low elasticity polymers with closely matched rheological properties. The second die design, the one that is being modified, achieves a more balanced flow path with constant cross‐sectional area. Flow visualization experiments and computational simulations show matched performance between the dies when layering similar viscosity materials and better layering performance of rheologically dissimilar materials with the improved dies compared to the original die design. Furthermore, the improved die has a much lower pressure drop. This facilitates decreased energy consumption or the allowance of additional multiplier dies to be added resulting in an increased total number of layers. POLYM. ENG. SCI., 54:636–645, 2014. © 2013 Society of Plastics Engineers     

A COMPARATIVE STUDY SHOWING THE POSSIBILITIES OF SILLIMANITE FOR USE IN EXTRUSION DIES1

This article sets forth the results obtained on the use of sillimanite for extrusion dies. A comparison of the relative length of life of various metal dies and sillimanite dies shows that sillimanite is very resistant to abrasion and has possibilities for use in dies.     

New way of using rheometers in scanning mode for the cure of rubbers

Rheometers, especially the moving die rheometer (MDR), is used under isothermal conditions for the cure of rubbers. Thus, at least three experiments are necessary at different temperatures selected within a rather narrow temperature window, for determining the kinetic parameters of the cure. Moreover, it takes some time for the sample to attain the selected temperature, and for a high temperature of the dies, the reaction takes place before thermal equilibrium has reached. With this new way of using the rheometer, the dies with the rubber samples in them are heated from the room temperature up to the selected final temperature, with a constant heating rate. Calculations have been done for evaluating the performances of this method. The kinetic parameters such as the activation energy and the pre-exponential factor, as well as the order of the overall reaction, are obtained from only one experiment. The temperature in the sample is constant and nearly the same as that of the heating dies. The profiles of temperature and of the state of cure developed through the sample thickness are rather flat during all the processes. The parameter of interest, with the value of the heating rate, should be between 2 and 10°C/min, and perhaps much better between 2 and 5°C/min.     

带预应力混凝土桁架转换层结构模型的拟动力试验研究

通过一榀1:10比例带预应力混凝土桁架转换层框架模型的拟动力试验和理论分析,对带桁架转换层框架结构的弹性地震反应进行了研究,并探讨了拟动力试验中隐式数值积分方法。试验和分析结果表明:带桁架转换层框架呈局部弯剪型的变形特性。