創新式無模薄殼熱成形製程研發

The development of the Moldless Thermal Forming Process and its thin sheet application

林瑞龍(Jui-Lung Lin)

指導教授 ： 汪家昌

國立臺北科技大學/機電學院/製造科技研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00265

摘要

目前對於2.5D的曲面薄殼之製程，多需要先製作模具，而對極少的原型需求，則都無法滿足所需的經濟性，因此有開發新製程的需求。如何開發出一製程技術，使能達到無模熱壓成型的效果，且能快速又低成本，將會具有市場的前景，且可取代傳統塑膠真空熱壓模具製程。
有別於傳統高分子薄板熱成型大多都需要模具的製程，本研究主旨在於研究無模的快速2.5D曲面薄殼工件原型製程及其設備，利用高分子塑膠材料加熱軟化可塑性變形的特性，使用高功率光源為加熱源，先在高分子塑膠薄板上繪製輪廓線，進行變形區定義，利用光學中黑色吸收輻射能的原理，讓輪廓線處能在短時間內吸收輻射能而達到玻璃轉化溫度軟化；成形過程中利用壓力差來控制加工變型方向，使高分子塑膠板能產生塑性變形，而成為欲加工的成品；進而將此方式應用在人臉的輪廓及圖像上，做出人臉的立體曲面薄殼，最後以客製化人臉浮雕為製程的驗證。

關鍵字

曲面薄殼 ； 無模成型 ； 人臉浮雕

並列摘要

Currently, for fabricating a 2.5D thin shell with curved surface, most of them require to manufacture a mold in advance. Such mold can not fulfill the requirement of the cost for a small amount of prototypes. Therefore, developing a new process, which can obtain a result of automatic hot-pressing shaping and can replace the process of the traditional plastic vacuum hot-pressing mold, is indispensible.
The aim of this research is to study the process and apparatus for thin sheet moldless thermal forming. The deformation is based on the physical property change of plastic material above the glass transition temperature which the material will turn from rigid glass like to soft rubble like. Before heating the polymer thin sheet, it is needed to draw the black contour line at the polymer thin sheet to define the deformation zone. Due to the radiation of light can be absorbed by black object, to make the black contour line reach its glass transition temperature quickly. During the shaping process, to use air pressure to make the polymer thin sheet be deformed. The example application of customized human face 2.5D thin shell has been applied based on the proposed innovative process. By the concept of layer manufacturing in rapid prototyping, the process of shaping by layer deformation without mold can replace the traditional vacuum hot-pressing shaping of the polymer plate.

並列關鍵字

Curved surface ； moldless thermal forming ； customized human face 2.5D thin shell

參考文獻

[6] 邱聖翔，以熱塑性薄板為基材之快速2.5D曲面薄殼工件原型製程研發，碩士學位論文，國立臺北科技大學，台北，2008。

[24] 朱曉英，「透明塑膠面具」，物理治療學會雜誌，第11卷，pp.22~24，1986.

[11] J. Kopac ∗, Z. Kampus, “Incremental sheet metal forming on CNC milling machine-tool,” Journal of Materials Processing Technology, 2005.

[15] 謝明哲，動態光罩微快速原型系統開發，博士學位論文，國立臺北科技大學，台北，2008。

[16] 魏宏樺，微快速原型系統之霧化鋪層技術研究，碩士學位論文，國立臺北科技大學，台北，2005