Influence of reinforcement on composite gear metrology
Influence of reinforcement on composite gear metrology
复制标题
强化对复合材料齿轮计量的影响
DOI：
10.1016/j.mechmachtheory.2007.09.002
复制
发表时间：
2008
影响因子：
5.2
通讯作者：
R. Gnanamoorthy
中科院分区：
文献类型：
--
作者：
S. Senthilvelan;R. Gnanamoorthy
注塑成型聚合物复合材料齿轮被用于许多动力和运动传输应用中。为了扩大增强聚合物在精密运动传动和低噪声应用中的应用，应提高模制齿轮的质量或精度。由于注塑成型齿轮质量受材料收缩行为的显著影响，因此需要了解纤维取向对部件收缩行为的影响，从而影响齿轮质量。在实验室中注射成型了未增强和20%短玻璃纤维增强的尼龙6/6直齿轮，并进行了齿轮制造的计算机辅助模拟。齿轮制造的模流模拟的结果与实际的纤维取向和测量的成型齿轮的取向参数相关。利用光学显微镜观察了齿轮成型过程中，在齿形、熔接线区域和注塑点附近纤维的实际取向。纤维沿齿廓沿着排列，抑制了收缩，引起各向异性收缩，显著减小了渐开线齿形参数与设计值的偏差。嵌在模制蒙皮表面中的纤维增加了齿轮齿廓形状和导程形状偏差。纤维在齿轮齿截面上的不对齐增加了齿厚、齿间距和径向跳动偏离设计值。
Injection molded polymer composite gears are being used in many power and motion transmission applications. In order to widen the utilization of reinforced polymers for precision motion transmission and noise less applications, the quality or accuracy of molded gears should be increased. Since the injection molded gear quality is significantly influenced by the material shrinkage behaviour, there is a need to understand the influence of fiber orientation on part shrinkage behaviour and hence the gear quality. Unreinforced and 20% short glass fiber reinforced Nylon 6/6 spur gears were injection molded in the laboratory and computer aided simulations of gear manufacturing was also carried out. Results of the mold flow simulation of gear manufacturing were correlated with the actual fiber orientation and measured metrological parameters of the molded gears. Actual orientation of the fibers near the tooth profile, weld line region and injection points of molded gears were observed using optical microscope. Fiber alignment along the tooth profile restricts shrinkage and induces anisotropic shrinkage, which significantly decreases the deviation of involute profile parameter from the design value. Fibers embedded in the molded skin surface increases the gear tooth profile form and lead form deviations. Non-alignment of fibers across the gear tooth section increases the tooth thickness, tooth-to-tooth spacing and radial runout deviations from design values.