208.5um,且可在不同位置直接成形。
2. 實驗發現,在成形機制上,不同的製程參數下的溝槽,會出現塑性區,
造成二種結構,影響溝槽粗糙度及形貌。
3. 本研究不銹鋼薄管經由冷軋加工後,硬度升高,經過雷射輔助氣壓成形 後,相較母材平均硬度330.28(Hv),在熔融區內平均硬度為237.34(Hv),
明顯降低。
71
4. 在不銹鋼薄管變形的區域內外側,均可發現明顯的氣孔。經掃描式電子 顯微鏡觀察,推斷是因為熔融時並且未使用惰性保護氣體造成氣孔的缺 陷。
5. 利用能量散佈光譜儀分析後,在試片的五個區域及表面中,並沒有特別 的成份變化,但表面有高鉻的氧化物產生。
5.2 建議
本研究雖成功利用無模成形方式製作出微米尺度的溝槽,但仍有一些問 題值得細究與改善,以下根據溝槽缺陷與表面粗糙度、最佳成形參數及散熱 管材效率,提供後續研究參考:
1. 溝槽缺陷與表面粗糙度:在本研究中,或因製程參數、材料限制等因素 而有缺陷產生,而溝槽中的表面粗糙度亦可視為一項重要參數,可針對 影響缺陷產生的因素及表面粗糙度的參數設定,進行探討。
2. 最佳成形參數:可以利用田口實驗法,找出最佳化之成形參數。
3. 散熱管材效率:使用其他熱傳導系數佳的材料進行雷射無模成形,探討 散熱元件的效率。
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