杉木壓縮木材二次元切削之研究

人工林針葉樹材之材質較闊葉樹材鬆軟，且其春秋材間之物理與機械性質差異明顯而成為加工利用上之缺點。惟此一缺點可藉壓縮木材之製造技術獲得改善。此等壓縮木材之比重與強度隨壓縮率之增大而增加，而木材之切削抵抗常隨木材之比重與強度之增加而增大，因此為提高壓縮木材在家具、建材與木材工藝等各方面之應用，有必要探討其切削加工性能。本試驗以蓮華池分所杉木造林木為試材，經製成不同壓縮率之壓縮木材，然後進行二次元縱切削試驗，測定切削力之水平分力及垂直分力，其結果顯示：切削力之水平分力隨壓縮率之增加而明顯增加；熱處理材切削力之垂直分力隨壓縮率之增加而有增大之趨勢；比切削力隨切削深度之減小而增大，隨壓縮率之增大而增大；切削摩擦係數與壓縮率無明顯關係，但隨切削深度之減小而增大。

關鍵字

壓縮木材；二次元切削；切削力；摩擦係數

並列摘要

Softwood is, in general, softer and lighter than hardwood. The distinguished physcial and mechanical properties of softwood between early wood and lat e wood often become the cause of defects during processing. But this weakness can be improved by a conversion to compressed wood. It ca n be expected that the density and strength of compressed wood increase with the increase of compression set, and also the cutting resistance. Therefore, it is necessary to know the machinability of compressed wood, which is important for its utilization. In this study, plantation China-fir (Cunninghamia lanceolata) green wood was compressed in the radial direction for various compression sets, and then orthogonal cutting parallel to the grain was applied. The results showed that the parallel cutting force increased with the increase of compression set, the normal cutting force of heat treated wood incr eased with the increase of compression set. The specific cutting force increased with the decrease of the depth of cut and increased with the increase of compression set. There was no clear relationship between cutting coefficient of friction and compression set, but it increased with the decrease of the depth of cut.

並列關鍵字

Compressed wood ； Orthogonal cutting ； Cutting force ； Coefficient of friction

國際替代計量

杉木壓縮木材二次元切削之研究

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