應用於3C產品(隨身碟)之多功能塑膠樞紐機構設計及改良研究

Mechanical Design Improvement and Research of Multi-Function Plastic Hinge for Portable Pen Driver

王明清(Ming-Ching Wang)

指導教授 ： 陳夏宗 ； 翁輝竹

中原大學/工學院/機械工程研究所/碩士(2012年)

https://doi.org/10.6840/cycu201200053

摘要

目前市面上大部份的3C產品(如手機，數位相機數位攝影機及筆記型電腦，電子翻譯機，等等…)都是使用金屬樞紐(Hinge)來作為旋轉輔助結構，但因其體積過大，重量也過重而零件成本相對也較高。本論文(技術報告)目的在於改善前述幾項缺點及達到具有與金屬樞紐有著相同功能，進而研究設計一款專門應用於隨身碟(Pen Drive)產品上之小型塑膠樞紐結構來取代現行的金屬樞紐結構。
研究的方向是希望此塑膠樞紐在結構上必需具備有0~164度自由度旋轉的功能，而當做旋轉動作時需有磨擦力(Friction)的結構來使其作動較平穩不易有搖晃情形發生。然後當隨身碟產品在打開金屬鋁蓋到固定角度使用及闔上金屬鋁蓋蓋住印刷電路板(PCB)時的相對位置都需具備有止動器(Lock)的功能，而其最重要的是為了導引使用者讓其能更便利的來操作及使用隨身碟。而最終目標是希望能將此機構設計概念實際應於其它產品結構上，以達到其能被順利導入量化。
利用Pro-e/Engineer、Solidworks等CAD軟體進行組件的分件作業，然後完成所有細部的機構設計，接著利用ADAMS、Moldflow等CAE 軟體進行機構作動模擬及開模前的模流分析作業。最後再進行可產品靠度的驗證作業，項目包括旋轉磨擦力(Friction)、折彎(Bending)、耐用性(Duration)等等測試。由最終的分析及驗證結果證實：
(1)當測試力矩達到0.528 N˙m (牛頓˙公尺)時，塑膠樞紐已經不會有被往外撐開及脫離的現象產生。
(2)將上蓋卡槽與塑膠樞紐之組裝間隙從原先的0.05mm修改為只有0.02mm後，組裝驗證完後的開口尺寸也只有(1.8-1.55) = +0.25mm(公差範圍為+0.3mm)。
(3)當金屬鋁蓋被旋轉到任意角度時已經有明顯磨擦力(Friction)產生而不會有旋轉晃動及落下的情形發生。

關鍵字

聚縮醛 ； 塑膠樞紐 ； 射出成型製程 ； 模流分析

並列摘要

Currently most of 3C products such as mobile phone, digital camera, digital video, notebook and electronic dictionary and so on are all used metal hinge as a rotation structure in the market, Due to its volume is too big and weight is a little heavy so that cost is higher as well. The purpose of this thesis (technical report) is in order to improve these defects and achieve the same function like metal hinge, therefore research and design a kind of pen driver with a compact plastic hinge instead of current metal hinge.
The direction of research in this mechanism of plastic hinge must have rotation function from 0 to 164 angles, and it will also need the friction structure to make rotation action more stable without shaking problem when swiveling. Then its lock function is the most significant to guide users to know how to operate it conveniently when metal cover of pen driver is opened and swiveled to the immovable angle for using and it is swiveled to cover the PCB(Printed Circuit Board). The final goal in this concept of mechanism design can be applied for other products actually and can be produced in mass production smoothly.
Will use CAD softwares of Pro-e/Engineer and Solidworks to do the mechanical design for details which include part separation and assembly, then use CAE softwares of ADAMS and Moldflow to do the mechanical motion and moldflow simulation before tooling is fabricated. The last step is to do some reliability test which includes rotation friction、bending and duration and so on. According to the final analysis and verification result：
(1)Plastic hinge has not opened and dropped out from body when the moment of force was more than 0.528 Newton˙Meter.
(2)Modified the assembly gap between the notch of top case and plastic hinge from 0.05mm to 0.02mm, the dimension of the assembly between metal cover and plastic main body is under 0.25mm (tolerance =0.3mm) after doing the verification again.
(3)There is obviously friction and will not have rotation shake and drop situation when metal cover is swiveled to random angle.

並列關鍵字

Plastic Hinge ； Moldflow Analysis ； Injection Molding Process ； POM(Polyformaldehyde)

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