详细介绍: 小模数尼龙齿轮一旦拥有,别无选择
          1.47kw的各种齿轮。预计到2015年,非金属齿轮的直径可以达到20inch、传输能力可以提高到12hp以上。日本树研工业公司开发了一种树脂齿轮,它是通过将碳纳米管、碳纤维等和聚丙烯等树脂材料混合注射成型制得的,由于混合了碳材料,该齿轮的强度得到提高同时摩擦阻力下降、润滑性提高。该树脂齿轮在拥有导电性的同时还具有屏蔽电磁波的功能。3工艺的先进性和材料的多样性许多先进的非金属齿轮成型方法正在不断被开发出来。例如采用二          酯(PBPET)。PBPET的LOI值可达37.0%,垂直燃烧达UL94V–0级,并且改性单体BHEEB的引入还能有效地改善聚酯燃烧时的熔滴行为。满足苛刻阻燃要求的环保阻燃增强PBT北京市化学工业研究院[45]采用双螺杆挤出机制备一种可同时满足UL94V–0级(0.8mm),750℃灼热丝接触材料30s内不起火且相比电痕化指数(CTI)达350V的环保阻燃GF增强PBT。当溴化环氧阻燃剂/三氧化二锑质量比为16/5、氮系阻燃剂用量为25份、磷系阻燃剂用量为15份、增韧剂用量            小模数尼龙齿轮一旦拥有,别无选择了测定材料的有关性能外,更重要的是测定成型后各种塑料件在正常和加倍劣化操作条件下工作时的各种数据,为此,作者设计了几种装置,测定了凸轮和凸轮单齿受力时的弯曲强度和形变,受冲击负荷时的冲击强度以及凸轮和齿轮的耐疲劳性和磨耗等。本文仅就塑料制件的摩擦与磨耗性能试验方法和结果进行初步的分析和讨论。齿轮和凸轮摩擦与磨耗试验的两种特殊仪一1滑动摩擦中,聚合物的磨耗是擦伤磨耗、粘附磨耗和表面疲劳三种损害综合作用的结                    合物表面首先产生弹性形变,井导致摩擦系数和摩擦热进一步增加。摩擦热足够高时,聚合物由软化开始熔融,并在很短时间中就产生了强烈的磨蚀。聚甲醛和尼龙在熔融前磨耗虽很小,但注意防止齿轮表面产生过高的摩擦热是其安全工作的必要条件。图5为在较高负荷和较快滑动速度下摩擦后纯聚甲醛试样断面的结构示意。试样的表层是无定型的,表明曾经发生过熔融的情况,表面并有损坏痕迹、裂纹以及粘附的磨损碎片。次表层也已经出现了部分熔融的      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小模数尼龙齿轮一旦拥有,别无选择算提供必要的数据。本文对MC尼龙斜齿轮动态力学性能及斜齿轮副啮合传动过程运用有限元分析软件ANSYS进行了计算机模拟分析,得到了一些有意义的结论。由于MC尼龙斜齿轮在传动过程中会产生热效应,而如果热效应不能很好的控制,那么MC尼龙斜齿轮将很难在工程实践中得到应用;另外,斜齿轮轮齿还可能发生应力疲劳失效等等,这些问题还有待进一步的研究和探讨。为了对MC尼龙斜齿轮进行更为全面的有限元模拟分析,以便更进一步地了解其      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S合金具有良好的涂饰性和对覆盖膜的粘附性,因此用PC/ABS合金制成的仪表板无需进行表面预处理,可以直接喷涂软质面漆或覆涂PVC膜。PC/ABS合金还可用来制造汽车仪表板周围部件、防冻板、车门把手、阻流板、托架、转向柱护套、装饰板、空调系统配件等汽车零部件。目前世界PC/ABS合金的产量约为7万t/a,每年以约10%的速度增长。(2)汽车外装件[10]PC/PBT合金和PC/PET合金既有PC的高耐热性和高耐冲击性,又有PBT和PET的耐化学药品性、耐磨性小模数尼龙齿轮一旦拥有,别无选择 |