低磨损HDPE饮料瓶盖压塑成型模具设计

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Aiming that the sliding friction structure in the inner lining sleeve and the screw thread core of the traditional beverage bottle cap pressing forming mould caused the friction surfaces to nap, blocking, easy wear etc., the rolling friction technology with wear small, small movement resistance was applied to the compression molding mould. Whether a rolling member was inserted between the inner bushing and the screw thread core in place of the original sliding friction was discussed.The relationship between the sliding friction, rolling friction and the wear speed was established, a ball retainer ring was added between the inner bushing and the screw thread core. The original sliding friction was changed into the rolling friction, thereby reducing wear and improving the life of the mould. The mould structure, manufacturing technology, economic benefits etc. were evaluated on the mould life and the cap quality. New structure of compression molding mold was designed and manufactured, and the long term test was developed on the original cap making machine. Research results show that, the mould wear is very little. Cap quality is better than before. The mould service life is raised one time above compared with the conventional compression molding mould.针对传统饮料瓶盖压塑成型模具中存在的内衬套与螺纹型芯采用滑动摩擦结构，摩擦表面容易拉毛、卡死，模具容易磨损等问题，将磨损小、运动阻力小的滚动摩擦技术应用到压塑成型模具中，开展了能否在内衬套与螺纹型芯之间加入一个滚动部件代替原来滑动摩擦的分析，建立了滑动摩擦、滚动摩擦与磨损速度之间的关系，提出了在内衬套与螺纹型芯之间加入一个钢球保持圈，将原来的滑动摩擦改为滚动摩擦的方法，以达到减少磨损、提高模具寿命的目的。在提高模具寿命、瓶盖质量上，对模具的结构、制造技术、经济效益等方面进行了评价。开展了新结构压塑成型模具的设计、制造工作，并在原制盖机上进行了长期试验。研究结果表明，该模具磨损非常小，瓶盖质量比以前更好；且与传统的压塑成型模具相比寿命可提高1倍以上。