研發動向



					2008年2月15日		第 33 期

研發動向

讓手機金屬殼圖紋更細緻--板件電磁成形技術

　　藉由電磁脈衝能產生近均壓之高速成形力，對於微細幾何圖案的複製與回彈問題的改善有極大的幫助；而電磁成形在10~100μsec間即完成，使得材料本身產生超塑性的現象，大幅提升材料的延展性，此外其非接觸式之成形方式，可以有效延長模具的壽命。
本計畫利用電磁成形的高速成形特性，搭配線圈與集磁塊的設計，探討鋁合金以及不鏽鋼板材在高速成形下對精微特徵尺寸的壓印成形能力。以液壓成形結合電磁成形兩道次製程，開發表面具有精緻紋路圖案之手機金屬殼件。

　　Through electromagnetic forming process, material can be stretched to much higher strains at high velocity versus conventional quasi-static stretching. We refer to this extended ductility in high velocity condition as hyper-plasticity.
The spatial distribution of forming pressure in electromagnetic forming can be controlled by the configuration of the coil and field shaper. Via EMF process, impact between sheet metal and a tool can create very large compressive stresses and these can be used to emboss micro-features in metal.
In this work many of these concepts were attempted on a variety of materials including aluminum alloys and stainless steel, with the intent of producing technologies capable for producing cell phone cases.

金屬形狀亦能隨設計起舞--複雜曲面機殼成形開發

　　由於近年來環保和再回收議題的盛行，可攜式電子產品構件的金屬化已是趨勢，如鋁、鎂等輕金屬材質就已經廣泛地使用在可攜式電子產品的構件或殼件上。為因應次世代可攜式電子產品的發展，新型式材質的應用與需求日益迫切，本計畫即是運用特殊板材，如不銹鋼、鈦金屬等難成形材，以及不銹鋼/鋁、鈦/鋁等雙層複合板，發展次世代具有特色之高質感金屬板材產品，並且利用板材液壓成形技術具有提高材料成形性、快速開發、簡化模具設計與成形道次、產品尺寸精度佳(回彈量小)及高表面品質等優點，以及藉由銲接技術的研發，解決後續雙層複合板與相關金屬鎖扣件之接合問題，將可提供業界完整的解決方案，並協助業者發展特殊金屬與複雜曲面或造型之高附加價值產品，以進一步帶動相關產品與產業朝向高值化方向發展。

　　Since environmental concern and recycling is prevalent, the development of metallic structure parts for portable electronic devices becomes the future focus. Accordingly Al and Mg metals used to be extensively applied to structural components or casings for such devices. The project pinpoints R&D of sheet metal forming of particular materials, such as SUS, Ti, and SUS/Al, Ti/Al clad metals, which may conform to the future demands from new generation electronic devices. Besides we will also engage in the development of sheet hydroforming technology, we expect to enhance the material formability, reduce the forming stages, make products with higher dimensional precision(small springback) and excellent surface quality. Moreover welding technology is to be investigated to solve the bonding problems between dissimilar metals and its attached elements. The project execution can assist the forming capabilities of particular metals and products with 3D complicated and curved shape. Additionally domestic related industry can develop toward value-added heightening through those technologies setup and introduction.