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首页> 外文期刊>Journal of Applied Polymer Science >Motion control for uniaxial rotational molding
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Motion control for uniaxial rotational molding

机译：单轴旋转成型的运动控制

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摘要

Motion control parameters of rotational molding can affect process efficiency and product quality. Different motion control schemes will lead to varied powder flow regimes exhibiting different levels of mixing and temperature uniformity. The change in nature of powder flow during a molding cycle suggests that varying the rotational speed could improve the powder mixing and temperature uniformity, therefore potentially reducing processing time and energy consumption. Experiments completed investigating powder flow under uniaxial rotation show that savings of up to 2.5% of the heating cycle time can be achieved. This validates the hypothesis that altering the rotational speed to maintain the ideal powder flow throughout the heating cycle can be utilized to reduce the time taken for all the polymer powder to adhere to the mold wall. The effect of rotational speed on wall thickness uniformity and impact strength were investigated and discussed. Results show a strong influence of rotational speed (and powder flow) on the wall thickness uniformity of the moldings with wall thickness uniformity deviations of up to 50% found (within the 2-35 RPM speed range tested).
机译：旋转成型的运动控制参数会影响工艺效率和产品质量。不同的运动控制方案将导致不同的粉末流动状态，表现出不同程度的混合和温度均匀性。成型周期内粉末流动性质的变化表明，改变转速可以改善粉末混合和温度均匀性，因此可能减少加工时间和能耗。研究单轴旋转下粉末流动的实验表明，可以节省高达2.5%的加热循环时间。这验证了一个假设，即在整个加热循环中改变转速以保持理想的粉末流动，可以减少所有聚合物粉末粘附到模具壁上所需的时间。研究和讨论了转速对壁厚均匀性和冲击强度的影响。结果表明，转速（和粉末流动）对模塑件的壁厚均匀性有很大影响，发现壁厚均匀性偏差高达50%（在测试的2-35 RPM转速范围内）。

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