多层电容器冷挤模设计

由于多层电容器的壁很薄，薄壁之间的间距小，环形的凹槽深，设计该零件的冷挤压模，若采用整体凸-凹模和固定凹模结构，则凸-凹模难以加工制造，且工件难于脱模。给出的多层电容器冷挤压模，采用镶套式组合凸-凹模和浮动凹模结构，不仅解决了型腔制造和工件脱模问题，而且改善了模具的填充、排气性能。     

管村无凹模冲孔变形机理分析与有限元模拟

通过对管材无凹模冲孔后废屑以及管件断面的分析,得出了无凹模冲孔变形机理以及无凹模冲孔断面示意图;Deform-3D软件对冲孔过程的应力应变进行了分析,为无凹模冲孔的工艺优化提供依据。     

探讨冲载凹模工作部分结构形成应用

本文介绍了冲裁凹模工作部分的结构组成。对各种冲裁凹模工作部分的结构形式进行分析,探讨凹模结构形式在模具设计和制造中的应用。     

一种新形深拉成形模具的设计与试验

在大批量生产金属板料杯形零件时，深拉深成形是一项很重要的成形工艺。在拉深成形过程中，有许多可变化的因素直接影响着拉深的效果和拉深件的质量，如坯料形状、凸模和凹模的圆角半径以及坯料材料的可成形性能等。特别是在深拉成形过程中，为了获得最佳的产品质量，坯料和凹模的形状对拉深成形影响较大。文章对五种类形压料板和凹模型状的影响情况进行了重点试验和分析，并在拉深凸模和凹模的圆角半径保持不变的条件下，依据金属板料的拉深比（即拉深系数d／D的倒数，用β表示），测量压料板压力的分布情况。由试验研究得出，在深拉成形工艺过程中，坯料和凹模问的夹角α直接影响着压料板压力的分布和拉深比。     

注塑模型腔壁厚计算公式讨论

凹模安装在定模上、凸模安装在动模上的注塑模结构,其凹凸模的受力情况与凹模安装在动模上、凸模安装在定模上不同,因此注塑模型腔壁厚的计算公式也不同．针对凹模安装在定模上、凸模安装在动模上的注塑模结构．对矩形型腔模具进行了受力分析和型腔壁厚计算。     

硅线石莫来石化材料在液态模锻模具中的应用

将硅线石莫来石化材料用于制作液态模锻模具中的凹模，并进行了铝合金液态模锻试验。尽管在实际比压值未达到材料的许用比压值时，凹模即遭到破坏，但所获得的铝合金制作表观良好，这说明用硅线石莫来石化材料作为液态模锻的模具材料是可行的。在试验结果的基础上，对试验中的不足进行了认真地分析，并提出了具体的解决措施。     

电冰箱门外壳冲压工艺及模具设计

通过对电冰箱门外壳的工艺分析，制定了一种合理的冲压方案，提高了工件的质量和生产效率，介绍了一种活动式凸模和活动式凹模的斜楔式复合成型模结构，并对模具的设计要点进行了介绍。     

一套模具成型两种制品的组合模具

本文设计出一种ＳＭＣ组合模具，它可利用中凹模翻转１８０°，实现一套组合模具压制成型两种不同形状的ＳＭＣ制品。     

模具浇注系统对PA66转子精密注射成型的影响

利用注射充模CAE软件，对精密注射成型PA66转子叶片模具浇注系统进行了优化设计，使PA66转子叶片在精密注射成型中质量分布均匀，并对优化前后两种方案的充模结束时的压力、充模结束时的温度、熔接线强度、填充情况、顶出时体积收缩率、缩痕指数、总体翘曲变形进行了比较，最后利用可视化实验对转子是否符合工作要求进行了验证。     

拉深模具复合电刷镀(Ni-P)-纳米TiB2

0引言 模具拉深过程中,凹模一般要受到压边圈产生的压应力、工件拉深时材料滑动产生的摩擦力、工件材料收缩变形时对凹模的形变力的综合作用.因此,拉深模具受力最大最复杂的部分是凹模,尤其是凹模的圆弧部位.凹模圆弧部位的磨损是导致工件拉伤和拉裂的主要原因.电刷镀最大的优点是能够对模具的磨损部位或易磨损的部位进行局部的修复及强化.     

浅谈如何提高电机转子压铸模寿命

本文以电机转子压铸模为例，简要介绍了电机转子的技术要求及工艺分析，详细阐述了提高电机转子压铸模寿命的方法，希望对相关压铸模技术人员有一定的帮助和借鉴作用。     

Influence of the steel core of composite squirrel cage rotor on motor performance

Since the critical whirling vibration frequency of high speed built‐In type motor spindle systems is dependent on the rotor mass of the built‐In motor and the spin‐die specific bending modulus, the rotor and the shaft were manufactured using magnetic powder contained epoxy and high modulus carbon fiber epoxy composite, respectively. In order to enhance the magnetic flux of the composite squirrel cage rotor of an AC induction motor, a steel core was inserted into the composite rotor. The motor parameters of the developed composite rotor system were obtained from the no‐load and blocked rotor tests and the effect of thickness of the steel core on the motor performance was investigated. From the magnetic analysis, the optimal steel core size for the dynamic characteristics of the rotor system mounted on the carbon fiber epoxy composite spindle was determined.     

Fiber orientation in multilayer tubes processed by a conical extruder

A new extruder design has been developed for the coextrusion of two-layer annular sections. The extruder consists of a conical stator-rotor-stator assembly, which performs extrusion from each side of the rotor. Flow within this assembly is fully three-dimensional, with helicoidal streamlines in the vicinity of the rotor and the die entry region. Fiber orientation is created in a circumferential direction by these helicoidal streamlines; close to the inner and outer surfaces of the tube, the fibers are parallel to the main extrusion direction, whereas in the mid-thickness, they are oriented in the circumferential direction. It is demonstrated that the amount of orientation depends on rotor speed and die design. When using a short die and high rotor speed, an increased fraction of fibers are oriented in the circumferential direction. Polym. Compos. 25:331–341, 2004. © 2004 Society of Plastics Engineers.     

自动叠装马达铁芯级进模设计

分析了马达铁芯的工艺特点及传统的加工工艺缺陷，设计了转子和定子同模套冲、自动叠装的级进模，确定了排样方案、模具总体结构，重点阐述了自动叠装技术的设计要点。该模具自2004年投入生产，表现出了效率高、运行稳定、刃磨寿命长等特点，对电机行业马达铁芯模的开发有较强的指导意义。     

Evaluation of the mixing performance for one novel twin screw kneader with particle tracking

In this article, a novel continuous twin‐screw kneader was proposed. The end‐cross section of the screw rotor consists of convex arcs and cycloidal curves and the rotors profiles were presented. The mixing performance of the novel twin screw kneader was simulated using finite element method (FEM) combined with mesh superimposition technique (MST). Statistical analysis was carried out for flow field using particle tracking technique to research the effect of geometry parameters and working parameters on the mixing performance. To study the dispersive mixing performance, specifically the maximum shear rate, maximum shear stress, maximum mixing index, residence time distribution (RTD) and RTD density function of tracer particles, and dispersive mixing is evaluated using the mixing index in combination with the shear stress. The results show that the changes of centre distance between female and male rotor have little influence on dispersive mixing performance, the lead of rotor has little effect on maximum shear stress and maximum shear rate, while it has an obvious effect on mixing index, cumulative RTD, and RTD density function. The rotor speed has obvious influence on mixing performance, and average residence time of material decreases greatly and the mixing ability is weakened, while the self‐cleaning performance of rotor improved obviously with the increasing of rotor speed. POLYM. ENG. SCI., 54:2407–2419, 2014. © 2013 Society of Plastics Engineers     

停放时间对于两段式串联混炼工艺的影响

采用串联式密炼机,分别研究停放时间对啮合型转子和剪切型转子对混炼胶质量的影响。实验结果表明,停放时间对于啮合式转子串联式混炼的影响要大于剪切型转子的串联混炼的影响,经综合分析混炼胶料的各项物理机械性能,可知胶料停放时间3小时为最佳值。     

冲料及断料对转子定量给料机的影响分析

通过应用数学分析工具并结合转子定量给料机的数学模型,对物料的流量及其稳定性与称重传感器测量值的关系进行了讨论和分析计算。得出结论为:转子定量给料机内物料的总重量及流量与称重传感器测量值之间存在非线性关系,冲料及断料对转子定量给料机的瞬时流量及物料的累积量的计量精度有较大影响,从而直接影响到转子定量给料机的配料精度,为正确使用转子定量给料机提供了初步的理论依据。     

新型共流转子与啮合转子构型对混炼胶料性能的影响

本文串联式密炼机中下游转子分别采用自行研发的新型共流转子和啮合型转子,对比两种不同转子构型的混炼机理以及混炼过程,利用传统全钢子午胎胎面胶配方,设计正交试验得到不同的工艺参数进行实验研究。通过对胶料性能测试实验数据的对比分析,探究新型共流转子相对于啮合转子在串联式混炼恒温反应式下混炼对胶料性能的影响。     

ZZ2转子的三维造型与有限元结构分析

使用三维CAD软件SolidWorks对ZZ2转子进行三维实体造型,利用SolidWorks中的有限元分析模块COSMOS对ZZ2转子在混炼过程中的受力情况进行模拟分析,对转子的应力、位移和安全系数等进行模拟计算,提高了转子受力分析的准确性,给转子设计提供参考,提高设计效率。     

Design and analysis of a dual-cavity coat-hanger die

A method for the design and analysis of a dual-cavity coat-hanger die is presented in this paper. A macroscopic material balance and a microscopic flow analysis using the finite element method are combined to simulate polymeric fluid flow inside the die. Leonard's macroscopic procedure was adopted to include inertial, gravitational, and viscous effects, and the finite element method was then applied to estimate the contributions of inertial and viscous terms. In addition, the flow patterns in the outer cavity were computed by the finite element method so that the appearance of an undesirable vortex could be predicted. The residence time distributions for flow in the die were approximated by a simple, statistical approach. It was found through a case study that a dual-cavity coathanger die can effectively reduce the flow non-uniformities caused by fluid inertia and viscosity variations.