IV型储氢瓶塑料内胆滚塑旋转工艺的选择  

Selection of rotational molding process for plastic inner liner of type IV hydrogen storage bottles

作　　者：温原 唐宇航 王修磊 谢鹏程[2] WEN Yuan;TANG Yuhang;WANG Xiulei;XIE Pengcheng(Zhejiang Rutoun Plastic Technology Co.,Ltd,Ningbo 315300,China;College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]浙江瑞堂塑料科技有限公司,浙江宁波315300 [2]北京化工大学机电工程学院,北京100029

出　　处：《工程塑料应用》2024年第5期95-100,共6页Engineering Plastics Application

摘　　要：塑料内胆尺寸精度对IV型储氢瓶的服役性能有重要的影响,壁厚均匀度不佳会直接导致内胆变形、直线度变小,进而导致缠绕工艺不良,储氢瓶开裂、耐压能力下降。而滚塑作为一种重要的内胆成型方法,在控制内胆壁厚均匀性方面具有挑战,其核心原因是滚塑过程工艺对内胆尺寸精度的影响机理缺失,业内较少研究工艺因素对壁厚的影响细节。采用ROTOSIM软件,分析了8种常见滚塑工艺对塑料内胆的壁厚均匀性的影响。结果表明,生产典型尺寸的储氢瓶内胆时,壁厚均匀度随旋转速度的加快而变好,但太快会导致粉末抛物流影响壁厚均匀度;旋转速比应避免为整数或半整数以防止粉末轨迹重复,摇摆机或旋转机L臂内胆竖放模式要优于旋转机L臂内胆平放模式和旋转机直臂模式;更重要的是,旋转中心是否与内胆轴心重合对壁厚均匀度影响较小,为一机多模生产方式提供了理论依据。作为本研究优化方案,当摇摆机旋转速度为1 r/min,摇摆速度为6.5次/min时,塑料内胆的壁厚变异系数为9%,为研究范围内的最小值。The dimensional precision of plastic liners has a significant influence on the service performance of type IV hydrogen storage tanks.Poor uniformity of wall thickness can directly lead to deformation and reduced straightness of the inner liner,resulting in poor winding process,cracking of hydrogen storage bottles,and decreased pressure resistance.Rotational molding,as an important liner molding method,has challenges in controlling the wall thickness uniformity of the liner,due to the missing mechanism of the effect of rotational molding process on the dimensional accuracy of the liner.There is relatively little research in the industry on the impact of process factors on wall thickness in detail.In this work,the effect of eight common rotational molding processes on the wall thickness uniformity type was analyzed by using ROTOSIM software.The results show that when producing typical-sized hydrogen storage tank liners,the uniformity of wall thickness improves with the increase of rotation speed,but too fast can cause powder scattering to affect the uniformity of wall thickness.The rotation speed ratio should be avoided as an integer or half integer to prevent duplicate powder trajectories.The use of the swing machine or rotary machine L-arm liner vertical placement mode is superior to the rotary machine L-arm liner horizontal placement mode and the rotary machine straight-arm mode.More importantly,whether the rotation center coincides with the inner liner axis has a relatively small impact on the uniformity of wall thickness,providing a theoretical basis for the one machine multi mode production method.As an optimization plan for this study,when the rotation speed of the rocking machine is 1 r/min and the rocking speed is 6.5 times/min,the coefficient of variation of the plastic inner liner wall thickness is 9%,which is the minimum value within the research range.

关 键 词：滚塑成型 壁厚均匀度 储氢瓶塑料内胆 旋转工艺 速比 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业] TK91[动力工程及工程热物理]