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題名 | 木材雷射雕刻之影響因子=Factors Affecting the Characteristics of Wood Engraved by Laser |
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作者 | 蘇文清; 蔡孟欣; 楊創明; 王怡仁; Su, Wen-ching; Tsai, Meng Hsin; Yang, Chuang Ming; Wang, Yiren; |
期刊 | 林產工業 |
出版日期 | 20050300 |
卷期 | 24:1 2005.03[民94.03] |
頁次 | 頁45-55 |
分類號 | 436.18 |
語文 | chi |
關鍵詞 | 雷射雕刻; 熱傳導率; 熱化學分解; 雕刻深度; 色差; Laser evgraving; Thermal conductivity; Thermal chemical decomposition; Engraved depth; Color difference; |
中文摘要 | 本研究是以雷射輸出功率25W、20W、15W和10W,搭配進給速度比率100%、80%、60%和40%,分別雕刻杉木、硬槭、非洲紫檀與中密度纖維板,量測雕刻區表面加工溫度、色差和雕刻深度,以了解加工參數對雷射雕刻之影響。其後以雷射輸出功率25W和進給速度比率40%的加工條件,分別對5種不同含水率之硬槭和5種不同比重之樹種進行雕刻試驗,以探討含水率和比重對雷射雕刻之影響,最後以電子顯微鏡觀察雕刻區之表面性狀。由試驗結果得知,當含水率固定時,增加雷射輸出功率或降低進給速度,對材料雕刻區表面加工溫度並無明顯之影響,而材料雕刻區之色差則是隨之增加,尤其在低進給速度與高雷射輸出功率下,致使材料偏向褐色。而雕刻深度隨著雷射輸出功率增大或進給速度降低而加深。經計算雷射雕刻總功得知,無論是提高雷射輸出功率或是降低進給速度,皆會增加材料雕刻位置所受的功,進而增加雕刻深度。高比重材料因木材實質率高,加上熱傳導率較高,因此雕刻深度較低比重材料來的淺,而其雕刻區表面加工溫度並不會因比重不同而有顯著之差異。另外,當硬槭含水率改變時,雕刻區表面加工溫度並無明顯之差異,而雕刻深度則隨含水率變化而不同,含水率在11.2%至27.6%之間可獲得較深之雕刻。木材經雷射加工後其表面組織呈現熔化後再凝固的現象,與傳統加工之撕裂表面組織截然不同。 |
英文摘要 | In this study, China fir, hard maple, African padauk and MDF were engraved with laser powers of 25W, 20W, 15W and 10W in conjunction with feed speed ratios of 100%, 80%, 60% and 40%, respectively. To understand the effects of machining parameters on laser engraving of wood-based materials, the temperature of engraved zone was measured simultaneously during engraving. The ΔE values and the depth of engraving were measured after engraving. In order to explore the effects of moisture content on the performance of laser engraving, five kinds of moisture contents of hard maple were used. Another five wood speices with different specific gravities were engraved to study the effects of specific gravity. Finally, the engraved surface was observed by SEM. The results of the study showed that the temperature of engraved zone has no significant difference when increasing power under fixed feed speed or decreasing feed speed for fixed power under the same or different moisture contents. The ΔE values were increased under lower feed speed and higher power, and resulted in brownish color in engraved zone. Furthermore, the engraved depth became deeper for either higher laser power or lower feed speed. The total work per unit length was found to be increased either with the increase of laser output power or with the decrease of feed speed. Therefore, the engraved depth was increased with the increase of the total power. In addition, the engraved depth was shallower for higher specific gravity materials, because of the high ratio of wood substance and the accompanied greater thermal conductivity. The temperatures of engraved zone were insignificantly different under various specific gravities and under various moisture contents. The engraved depth was deeper in the moisture contents ranging from 11.2 to 27.6%. The melted and re-solidified phenomenon could be observed on the surface after laser engraving that is different from traditional machining. |
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