牵引橡胶堆注射硫化成型工艺研究

采用一种牵引橡胶堆进行了注射模具设计,研究了注射硫化成型和注压硫化工艺及产品性能的区别。结果表明,随着新注射模具自动化程度的提高,注射硫化成型工艺的硫化时间较原注压工艺有所缩短,硫化内压提高,橡胶与金属粘合良好,疲劳性能较好,注射硫化成型工艺产品可以达到原注压硫化成型工艺产品性能水平。     

橡胶履带压注成型整体硫化工艺研究

由于目前传统的橡胶履带制造方法都存在需分段硫化且第一模需通冷却水及第二模橡胶接头部位硫化程度不致等问题,故很容易产生橡胶裂口等质量缺陷。本文介绍了橡胶履带压注成型整体硫化工艺,该工艺将外层胶、挤出挂胶钢帘线缠绕成的环状钢帘布与传动筋板等配件一起预成型于压注式圆形活络橡胶履带内模腔内,再用注塞模将外层胶从压注室经压注孔通过平板硫化机压注到模腔内,最后硫化成产品。该工艺成型后只需硫化一次就能出成品,橡胶履带带体胶料物性均匀一致,克服了传统工艺的缺点。     

注压硫化工艺在药用卤化丁基橡胶瓶塞中的应用

简单介绍了药用卤化丁基橡胶瓶塞用注压硫化工艺生产时对胶料配方、生产设备和模具的要求。以及工艺参数的调整原则和产品的特性等。     

日本KRV－60型橡胶注压机的应用

介绍了ＫＲＶ－６０型橡胶注压机的特性和应用及橡胶注压工艺的配方、主要技术参数和对胶料的要求。因橡胶注压工艺具有高温快速硫化、节省原材料及自动化程度高等优点，故以橡胶注压机代替平板硫化机是橡胶加工工业发展的方向。     

硫化机热工管路双排双抽改造

为解决硫化胶囊泄压慢导致硫化机无法开模以及轮胎过硫的问题,研究过热水硫化工艺硫化机热工管路改造方案。设计了3种改造方案:在硫化机进路增加0 MPa热水排,在硫化机进路增加抽真空,在硫化机进路同时增加0 MPa热水排和抽真空。结果表明:在硫化机进路同时增加0 MPa热水排和抽真空,泄压量明显提升,硫化机开模前硫化胶囊内的压力能够全部排净,改进效果最好;硫化机可以自动开模,单机生产效率提高,轮胎过硫问题得到解决。     

轮胎硫化胶囊和胶囊注射法生产（四）

介绍了轮胎硫化胶囊的结构和特点.详细总结和分析了轮胎硫化胶囊注射法生产的特点、制作工艺、胶囊注射硫化机基本结构与工作原理.总结论述了各种结构的特点及主要性能参数.另外还分析了注射法生产硫化胶囊的主要缺陷和解决方法.     

注射模硫化成型工艺在轨道减震器中的应用

研究注射模硫化成型工艺在轨道减震器中的应用,并与传统高压模硫化成型工艺进行对比。结果表明：与采用高压模硫化成型工艺相比,采用注射模硫化成型工艺可以缩短产品硫化时间,提高生产效率;增大产品内压,提高橡胶硫化均一程度,增大橡胶-金属粘合强度;减小产品疲劳试验后垂向静刚度、垂向动刚度和动静刚度比的变化,使用过程中产品性能更为稳定。     

注压式胶囊硫化机调查报告

调查了美国库珀轮胎橡胶公司胶囊生产的工艺条件,生产效率和废品率以及胶囊的使用次数。比较得出注压式胶囊硫化机比传统的模压式胶囊硫化机优越的结论。从经济角度和适用性考察,不值得花费巨资将模压式胶囊硫化机改造成注压式胶囊硫化机,还是购买新机合算。     

注射法生产轮胎硫化胶囊的效果、机理与展望

注射法生产轮胎硫化胶囊，具有生产能力高，成本低等优点。胶囊注射硫化成功的关键在注射阶段；在本文中介绍几种解决注射法生产胶囊质量问题的方法。现已可自制注射胶囊硫化机。     

一种橡胶厚制品硫化成型模具结构设计的探讨

以一种橡胶厚制品的硫化模具结构设计为例,探讨了注压模具和模压模具对工艺和产品性能的影响,论述了模具结构设计与优化方案。结果表明,两种模具结构各有特点,对所述的产品而言,更适合采用模压模具。     

常见注塑成型缺陷及解决办法

由于塑料制品使用时外观要求高、抗冲击韧件要好,而注塑成型加工过程是一个涉及多方面因素的复杂加工流程,在生产过程中会出现产品缺陷,本文分析了生产塑料件时常见缺陷产生的原因,并从成型工艺条件(温度、压力、时间、注射速度等)的调整、模具结构合理性的修改、原料使用前处理等方面提出了解决问题的措施与对策。     

注塑成型模拟技术在注塑工艺中的应用

注塑成型工艺已经发展成为塑料工业最重要的加工手段,注射模塑过程中需要选择和控制的压力包括塑化压力、注射压力和保压压力,它们直接影响塑料的塑化和塑件质量。通过对注塑过程中所涉及的工艺条件如何影响塑料制品的质量作了探讨,借助注塑工程分析软件对塑料制品的成型过程进行模拟,合理确定这些工艺参数,并分析了一个应用CAE技术优化工艺参数的实例,提出了比较切合实际并容易提高产品质量的注塑工艺方案。     

基于石膏模的压力注浆工艺研究

以石膏模具为基础，研究了注浆压力、时间、泥浆性能等工艺条件对坯体性能的影响。提出了基于石膏模压力注浆工艺制度，为石膏模压力注浆机的研制提供了依据。     

Morphology evolution during injection molding: Effect of packing pressure

Injection molding is one of the most widely employed methods for manufacturing polymeric products. The final properties and then the quality of an injection molded part are to a great extent affected by morphology. Thus, the prediction of microstructure formation is of technological importance, also for optimizing processing variables. In this work, some injection molding tests were performed with the aim of studying the effects of packing pressure on morphology distribution. The resulting morphology of the moldings was characterized and it was compared with previous results gathered on samples obtained by applying a lower holding pressure. Furthermore, the molding tests were simulated by means of a code developed at University of Salerno. The results obtained show that on increasing holding pressure the molecular orientation inside the samples increases, and simulations show that this is due mainly to the increase of relaxation time caused by the higher pressures. On discussing the simulation results, some considerations are made on the effects of pressure on crystallization kinetics and on rheology.     

注射成型EPDM/PP热塑性硫化橡胶的制备及性能研究

研究了注射成型EPDM／PP热塑性硫化橡胶的配方及共混设备对性能的影响。结果表明：采用双螺杆挤出机制备,硫化剂用量为3份时,制得的EPDM／PP的性能较好;注射成型试样的拉伸性能好于模压成型试样。     

充填时间及材料性质对注射压力的影响

本文介绍用数值模拟方法模拟注塑成型过程充填时间及材料性质对注射压力的影响，并以实实详细讨论了各因素对注射压力影响的原因，给出出充填时间的估算公式。     

注塑成型保压阶段的分析

本文主要研究二维矩形模腔的非等温、可压缩无定形聚合物的保压阶段。流体是广义牛顿型的，可压缩行为服从Ｔａｉｔ的ｐ—ｖ—Ｔ状态方程。本文在展示保压阶段速度、压力的分布，密度沿着厚度方向的变化的基础上，讨论了保压阶段压力和密度的分布对最终产品的内应力、收缩和翘曲的影响。研究结果表明，保压阶段是注塑成型过程中一个非常复杂的阶段，其压力、温度、速度、密度的变化强烈地依赖于熔体的粘度和模腔的边界条件     

倒置式潜油电泵机组井下增压注水技术在B15井的应用

涠12-1N油田为注水开发油田,地饱压差小,为满足注采要求,必须进行增压注水。但由于受平台空间的限制,地面增加设备非常困难。本文提出了将潜油电泵机组＂倒置＂在注水井井筒中,将14M Pa注水源增压至21M Pa来实现增压注水的方案,并在W 12-1-B15井获得应用成功。该方法不仅满足了注水要求,而且这一工艺填补了国内海上油田倒置式潜油电泵机组井下增压注水技术的空白。     

Impact of biodiesel bulk modulus on injection pressure and injection timing. The effect of residual pressure

As the demand for energy rises fossil fuel reserves are depleted daily, increasing the interest in alternative fuels. Biodiesel is one of the best candidates in this class and its use is expected to expand rapidly throughout the world. Numerous researchers have been investigating how biodiesel affects combustion, pollutant formation and exhaust aftertreatment. There is general agreement that its combustion characteristics are similar to those of standard diesel fuel, except for a shorter ignition delay, a higher ignition temperature, and greater ignition pressure and peak heat release. Engine power output is similar with both fuels. As regards emissions, reductions in particulate matter (PM) and carbon monoxide (CO) and increases in nitrogen oxides (NOx) are described with most biodiesel blends. The latter is referred to as the ‘biodiesel NOx effect’. The vast majority of researchers who explored the effect of biodiesel did so in mechanical injection engines. They found that the primary mechanism by which biodiesel increases NOx emissions is by an inadvertent advance in the start of injection timing, caused by a higher modulus and viscosity. However, more recent studies show that NOx emissions also increase in biodiesel-fuelled common rail engines, and that in some cases they actually decrease in engines with mechanically controlled fuel injection systems. This cannot be explained solely by differences in compressibility and remains an open question. The present study provides a contribution to the discussion in this field by describing a new method to evaluate the injection advance in engines with mechanically controlled pumps. The experimental data show that the advances in the start of injection timing, using biodiesel rather than mineral diesel, are smaller than those calculated with standard methods and may even not occur at all, depending on injection system design. In addition, they demonstrate that, contrary to common belief, injection pressure does not always increase when using biodiesel. These data may help explain why some researchers have found similar or even reduced NOx emission also with mechanical injection systems.     

面罩镜片注塑制品及工艺条件对比优化设计

本文针对一面罩镜片缶以及注射机的工艺条件进行了优化对比设计，通过定注射机，工艺条件下，对比不同种类性能相似的材料找出最适合注塑材料；定材料，工艺条件下，对比不同锁模力注射机找出最适宜注射机，利用“可行注射工艺窗”找出最小制品厚度，利用“优化注射工艺窗”设计较佳的注射温度和注射压力，通过优化冷却条件制定冷却时间和适宜模具温度，并由材料ＰＶＴ关系设计合理浇口尺寸，保压压力和保压时间等工艺参数。