基于CAE分析的塑料盖板注射模设计

分析了塑料盖板的结构特点,使用Moldflow软件对塑件的注射成型过程进行了CAE分析,确定了模具的浇注系统、冷却系统。在模拟分析的基础上,运用Pro/E软件完成了模具设计。     

基于CAE分析的铰链式塑料瓶盖注射模设计

分析了铰链式塑料瓶盖的结构特点,使用Moldflow软件对塑件注射成型过程进行了CAE分析,确定了模具的浇注系统及成型工艺。模具采用点浇口、自动脱螺纹结构,模具结构设计合理,生产效率高。     

基于CAE技术的网孔音响壳注射模设计

针对网孔音响壳成型中产生熔接痕的问题,利用Moldflow软件进行CAE分析,预测塑件产生熔接痕的位置;模具结构采用深入式浇口套的浇注方式,多点进浇以及快速排气装置排除型腔中的空气,并利用机械臂自动取件。结果表明:借助CAE进行模流分析的模具设计,塑件成型质量良好,生产效率高。     

基于CAB分析的铰链式塑料瓶盖注射模设计

分析了铰链式塑料瓶盖的结构特点,使用Moldflow软件对塑件注射成型过程进行了CAE分析．确定了模具的浇注系统及成型工艺。模具采用点浇口、自动脱螺纹结构,模具结构设计合理,生产效率高。     

基于CAE分析的底座注射模设计

分析了塑料天线底座的结构特点,使用Moldflow软件对塑件的注射成型过程进行CAE模拟分析,确定了模具的浇注系统、冷却系统。在模拟分析的基础上运用Pro/E软件完成了模具设计。模具采用潜伏式浇口、提升装置的抽芯机构及合理的冷却系统,模具结构合理。     

基于CAE分析的风筒壳后盖注射模设计

分析了风筒壳后盖的结构特点,用Moldflow软件对塑件的注射成型过程进行了CAE模拟分析,确定了模具的浇注系统、冷却系统。在模拟分析的基础上运用UGNX4.0软件完成了模具设计。模具采用潜伏式浇口、斜导柱侧抽芯及斜顶抽芯机构及合理的冷却系统,模具结构设计合理。     

基于CAE分析的汽车制动液罐注射模设计

分析了汽车制动液罐注射件的结构特点,使用Moldflow软件对制品的注射成型过程进行CAE分析,确定了模具的浇注系统和成型工艺条件。模具为三板式点浇口结构,采用嵌件抽芯、斜导柱抽芯和液压抽芯相结合的方式实现模具的抽芯要求,并在此基础上完成了模具设计。     

遮热架注射模设计

针对遮热架复杂的外部形状,介绍了复杂不规则件在模具设计中摆放方位的分析方法,通过对塑件内部结构特征的分析可知,塑件四周边凹凸不平的结构成型设计是本模具的设计难点。应用CAE模流分析技术确定了该塑件的浇注系统成型方案与冷却系统设计方案,预测了该塑件成型模具在注射生产时的成型工艺参数及潜在成型缺陷,模具设计中,采用斜导柱与滑块式的抽芯机构成型塑件在3个方向上的侧凹特征;采用T型块与滑块组合式的抽芯机构成型塑件另一方向上带倾斜角的侧凸凹特征;采用树脂闭合开模器与小拉杆的组合形式控制模具的3次顺利定距分型动作;采用推杆机构进行塑件推出,模具结构简单可行,节省了模具制造成本,为类似塑件的模具设计提供借鉴。     

基于Pro/E及Moldflow的汽车玻璃包边注塑模设计

应用CAD/CAE技术对汽车后三角窗玻璃包边注塑模进行设计。运用Moldflow对塑件进行成型仿真分析,采用Pro/E软件建立塑件实体模型和分型面设计,并利用EMX进行了模架调用与装配,最后拟定了模具结构。该方法有效地缩短产品的开发周期,降低了模具的设计和制造成本。     

CAE技术在气辅模具开发中的应用

在彩电前壳气辅模具设计中,应用注塑CAE技术对模具气道布置、冷却系统以及熔体充填形态、翘曲状况进行模拟分析,并优化了塑件壁厚。结果表明,运用CAE技术,能够显著提高模具试模和气辅成型技术应用的成功率,缩短模具开发周期,节省模具设计和制造成本。     

高效耐磨金刚石锯片的研制

采用正交实验的方法,对公路维修金刚石锯片胎体材料的有关参数进行了研究,实验对比了18种胎体配方的硬度及抗弯强度,选择几种优良胎体配方进行进一步的实验,对其性能及其稳定性进行比较,选择出优质胎体配方;在其中掺入金刚石,采用适当的烧结工艺制造出金刚石锯片,进行切割混凝土实验.综合分析实验结果,表明实验中加入适量低熔点金属和粗粒度金刚石提高了切割效率,加入细粒度金刚石可以有效地提高金刚石锯片的耐磨性,从而研制出高效耐磨金刚石锯片.     

灰铸铁泵壳粘砂缺陷的防止措施

介绍了灰铸铁泵壳铸件的结构及技术要求,详细阐述了该铸件的原生产工艺,针对原工艺存在的粘砂问题,对缺陷机理进行了分析,找出问题产生的根源,采取了以下措施:(1)型砂紧实率由32％～36％降至30％～32％;(2)型砂水分含量由3.2％～3.4％降至2.9％～3.2％;(3)湿压强度降低到0.15～0.17 MPa;(4)...     

Strength characteristics of copper/aluminium alloy friction welded joints

The susceptibility to hydrogen-induced cracking in hydrogen sulphide (H₂S) environment of welded API X80 steel was studied. The flux-cored arc welding process was employed with E71-T1 and E71-T8K6 wires. The welding parameters were kept constant, but the samples were welded using different preheat temperatures (room temperature and 100°C). The gapped bead-on-plate (G-BOP) test was used. The specimens of modified G-BOP tests were exposed to an environment saturated with H₂S, as recommended by the NACE TM0284 standard. The weld beads were characterized by optical microscopy and the level of residual hydrogen in the samples was measured. The fracture surface areas of hydrogen-induced cracking were calculated and the fracture mode was discussed. It was found that the preheating temperature of 100°C was enough to avoid cracking, even in the presence of H₂S. It was also found that the E71-T8K6 wire was more susceptible to cracking, and the typical mixed-mode fracture was predominant in all samples.     

常温固化环氧树脂金属防腐蚀底漆的研究

选用115、2015、NX-2045和2041四种胺类固化剂,并对固化后的环氧树脂涂膜进行比较试验,结果表明:使用NX-2045固化剂后涂膜的干燥速度、力学性能、耐盐雾性能都较优;但附着力和涂膜耐酸、耐碱能力仍有待提高。通过添加适量的(0.4%质量份)含氨基硅烷偶联剂A-1120,附着力与不加相比,从1级提高到0级,涂膜耐酸和耐碱能力都有提高。     

纳米结构对二硫化钼摩擦学性能的影响

目的探究二硫化钼结构以及尺寸对其宏观摩擦学性能以及滑移机制的影响。方法采用水热法制备了尺寸不同的二硫化钼微球花,并与购买的商业化块状二硫化钼以及单层二硫化钼进行对比,将四种二硫化钼粉末在乙醇中进行分散,采用喷涂的方式在硅基底上制备了四种二硫化钼涂层。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和透射电子显微镜(TEM)对粉末和涂层的形貌、结构进行了表征,并对比研究了涂层的摩擦学性能,通过光学显微镜观察了对偶的形貌,利用SEM和TEM对摩擦界面的结构和形貌进行了研究。结果四种二硫化钼材料均为层状结构的纳米片或微片组成,摩擦系数平稳且均小于0.05。块状二硫化钼寿命最短,摩擦界面覆盖了较少的润滑膜;单层二硫化钼摩擦系数平稳,且寿命最长,摩擦界面由大量纳米片组成,摩擦过程主要是单纯的物理剥离;二硫化钼微球花的寿命介于二者之间,微球花在摩擦力的作用下很容易发生剥离,在摩擦过程中起润滑作用的是剥离的二硫化钼纳米片,摩擦界面覆盖了较厚的致密润滑膜。二硫化钼微球花摩擦后,层间距由0.62 nm增至0.7 nm,层间距的增大有利于良好的润滑。结论尺寸对二硫化钼的滑移机制有影响,从而显著影响其耐磨寿命,层数和尺寸的减小有利于耐磨寿命的提升。     

光亮碱性Zn-Al合金电镀工艺研究

在碱性锌酸盐镀锌液中加入铝盐，研究成功了一种光亮碱性锌铝合金电镀工艺。采用霍尔槽试验探讨了镀液成分和工艺条件对镀层质量的影响，检测了镀液和镀层性能。研究结果表明：镀液阴极电流效率达到80%以上，镀液分散能力和复盖能力好，镀层中铝含量为1．5％左右，所形成的Zn-Al合金镀层结晶细致、光亮度好、结合力好、耐蚀性优良，适用于作高耐蚀性镀层。     

Deposition and characterization of flame-sprayed aluminum on cured glass and basalt fiber-reinforced epoxy tubes

An oxy-acetylene flame spray torch was used to deposit thin layers of aluminum onto cured glass and basalt fiber-reinforced epoxy tubes. The composite specimens were fabricated by filament winding. Surface coatings embedded in composite laminates were produced. The composite substrates were grit blasted to promote adhesion of the molten aluminum particles. It was found that adhesion increased significantly when the composite substrate was lightly grit blasted, with no adhesion on smooth composite surfaces. The number of passes of the flame spray torch was varied to change the coating thickness and uniformity over the substrate. The electrical resistance of the coatings was measured to assess the suitability of a coating as a conductor. It was found that uniform, electrically conductive coatings were produced with a minimum of two torch passes. Optical images were captured to characterize the coating microstructure and thickness. This investigation did not reveal any visible evidence of damage to the composite substrate. To assess possible degradation effects from the grit blasting and flame spraying processes, the tube specimens were subjected to mechanical testing by applying internal pressurization with hydraulic oil. The tests indicated that the grit blasting and flame spraying processes must be carefully executed to mitigate degradation of the strength of the composite material substrate.     

树脂锚杆钢筋的生产工艺优化

介绍了树脂锚杆钢筋的产品特点和生产难点，分析了生产过程中出现的尺寸不合格、性能不合格的原因，及对此采取的措施，从而使钢筋尺寸不合格率降至0.05%以下，成材率提高至97.8%。     

Shot lining of magnesium alloy with hard powders

To improve the surface properties, lining of magnesium alloys with hard powders by shot peening was carried out in order. The hard powders were tried to bond to the workpiece surface due to the collision of many shots. In order to fix the hard powders to the surface of the workpiece, the powders were set on an uneven surface. To easily facilitate fixing of powders, lining of the workpiece with the powder sandwiched between two aluminum foil sheets was also attempted. In this experiment, a centrifugal shot peening machine with an electrical heater was employed. The workpieces were magnesium alloys AZ31B and AZ91D, and the hard powders were commercial cemented carbide, alumina, and zirconia. The joinability of hard powders near the lined surface was observed by a optical microscope. The wear resistance was also evaluated by a wear test. The hard powders were successfully bonded to the surface of workpieces by the shot lining process. The results show that the present method is effective in wear resistance of the magnesium alloys.     

酸轧2 GPa热成形钢焊缝断带原因分析及对策

针对某企业生产2 GPa热成形钢酸轧后焊缝断带的问题,利用金相显微镜和扫描电镜对断带试样进行了分析,并通过对焊接及酸轧工艺过程的调查,确定了焊缝断带的原因:带钢焊缝二次回火不充分,存在回火马氏体脆性组织;由于带钢强度高,圆盘剪易崩刃,切边质量较差,在轧制过程中形成边裂缺陷,当边裂缺陷处于焊缝时,诱导存在回火马氏体脆性组织的焊缝解理开裂,在张力的作用下撕扯开裂并贯穿整个焊缝而造成。为此,对焊缝二次回火工艺参数进行了优化,提高了加热功率和降低了带钢速度,以保证焊缝充分回火得到回火索氏体组织,避免了回火脆性组织;同时,通过优化圆盘剪工艺参数及加强剪切带钢边部质量检验,避免了酸轧后的边裂缺陷,杜绝了轧制时2 GPa高强带钢由于边裂缺陷诱发焊缝撕裂而造成的断带事故。