Study on Development of Low Noise Plastic Gear and Injection Control

注塑成型塑料齿轮广泛用于旋转和动力传递。通常，变形层容易出现在齿轮的齿面中。从齿轮强度的角度出发，要求变形层薄。因此，使用变形层的建议对于注塑塑料齿轮的静音是有用的。假设一个帮助开发一个优秀的塑料齿轮在沉默中，变形层产生的注射成型塑料齿轮的牙齿制造的结晶树脂表明，厚度和机械性能的影响，成型条件。本课题选用两种聚缩醛树脂，在不同的成型条件下制备了注塑塑料齿轮。本研究以偏光显微镜观察及硬度测试分析不同成型条件下所制造之塑胶齿轮。此外，还对齿轮的噪声进行了测试， ...更多信息 实验研究了齿轮动力运转检查机对变形层厚度的影响。研究结果表明：（1）树脂与模具的温度差对牙齿的硬度和表层厚度有影响。(2)噪声水平变得如此之低，以至于齿轮齿产生的变形层很厚。(3)在气缸与模型温差较小的工况下产生的齿轮噪声水平比在大温差工况下产生的齿轮噪声水平有升高的趋势。(4)齿轮的磨粒磨损受齿面变形层厚度的影响，齿轮的寿命可以从噪声异常升高的时刻来考虑。(5)变形层较薄的聚甲醛共聚物齿轮磨损量较小，而聚甲醛均聚物齿轮的磨损量没有变化趋势。通过选择合适的注射成型工艺条件，给出了一种低噪声塑料齿轮的成型方法。少

The injection molded plastic gears are widely used for rotation and power transmission. Generally, the deformed layer appears easily in the tooth surface of the gear. The thin deformed layer is demanded from the viewpoint of gear strength. Therefore, the proposal to use the deformed layer is useful for the silence of the injection molding plastic gear. To assume a help of the development of an excellent plastic gear in silence, the deformed layer generated to teeth of the injection molding plastic gear manufactured by crystalline resin showed that the thickness and mechanical properties were influenced on the molding conditions. Two kinds of polyacetal resins were chosen in this problem, and the injection molding plastic gears were manufactured under various molding conditions. In this study, the polarization microscope observation and hardness examination of the plastic gear manufactured under various molding conditions were analyzed. Furthermore, the noise of the gear was examined ex … More perimentally on the influence of the deformed layer thickness by a gear power operation examining machine. The results obtained in this study were as following : (1) The temperature difference of melted resin and the mold influences the hardness and the skin layer thickness of tooth. (2) The noise level becomes so low that the deformed layer produced for the gear's tooth is thick. (3) The noise level of gear that was produced on conditions of the low temperature difference of cylinder and model is in a higher tendency than the gears produced on the conditions of the large temperature difference. (4) The abrasive wear of gear is affected by the thickness of the deformed layer of the tooth, and the life of gear can be considered the moment when a noise level rose abnormally. (5) The amounts of wear in the polyacetal copolymer gears with the thin deformed layer were little, but that of polyacetal homopolymer gears didn't become the same tendency. The molding method of a low noise plastic gear was able to be shown by selecting a proper injection molding conditions. Less