汽車板金沖模的設計一般係於2D CAD的環境下進行圖面繪製，而此方式無法完整表達出3D空間結構，且修改圖面也須花費大量時間，無法達到零件尺寸間的連動關係，為改善此問題，本論文嘗試在Creo的3D CAD環境下進行汽車引擎蓋外板金之沖模設計，並利用軟體本身的內部功能，使用建立參數及關係式的方法，達到模座間的連動關係。
本論文首先建立引擎蓋外板金零件的3D CAD曲面模型，接著利用曲面模型規劃加工道次，並以複合模的方式建構模具，將數個加工道次合併，完成的沖壓模具包括：引伸模、沖孔與裁邊模、裁邊與折彎模共三副。在模具設計方面，本研究利用「共用模座」的概念，使模座在設計時能彼此共用，不但可達到縮短加工與設計模具的時間，同時也可以降低材料的浪費；在設計變更方面，本研究使用Family Table建構沖頭尺寸的參數表單，以利設變時的選取，並利用Top-down design的概念，藉著幾何模型的合併與繼承、抓取板金造型面的邊界線，以及參數與關係式的各種方式，使造型面與模座及沖頭之間具有幾何連動的關係，以達到設計變更的要求。

The design for the stamping dies of automobile panels is generally drawn and drafted under a 2D CAD environment. However, this approach cannot fully express the 3D spatial structure, and modifying the drawings requires considerable time by the designer. A 2D CAD environment is unable to achieve the interlocking relations between the parts’ dimensions. To address this problem, we attempted to apply a stamping die design on the outer panel of an automobile’s engine hood inside Creo’s 3D CAD environment and made use of the software’s internal functions by setting up parameters and relations to achieve the interlocking relationship between the mold bases.
First, we created a 3D CAD model for the free-form surface of the outer panel of the engine hood. The surface model was subsequently used to plan the manufacturing operations and construct the composite die of a stamping mold. By merging a number of manufacturing operations, the stamping die comprises three stages of molds: drawing mold, piercing and trimming mold, and trimming and flanging mold. For the job of mold design, we used a common mold base, which can be shared with the team during the design process. This approach not only shortens the time taken to machine and design the mold, but it can also reduce the wasted materials. For the issue of design change, we used a family table in Creo to set up the parameters for the dimensions of punch to facilitate the selections during the design change. We also made use of the concept of top-down design in Creo via the merge and inheritance of geometric models to find the boundary curves of the panel surface. Moreover, a variety of methods based on parameters and relations in Creo were used to ensure the geometric interlocking relationships between the panel surface and the mold base and the punch to meet the demands of design change.

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