層積竹材表面精細加工與刀尖磨耗

竹子為台灣特產，是世界竹林資源最豐富，種屬品種也最多的國家，以竹材生長速率快之特性，3～5年即可砍伐利用，且在相同比重下，竹材具有高於木材強度之特徵，合理利用竹材資源，實是重要課題。本研究擬以自行開發製作之二段式鉋光機鉋削層積竹材，並與手壓鉋鉋削面及砂磨面比較，期能取代砂磨作業，並將分析高速鋼刀片鉋削層積竹材之刀具磨耗情形。試驗結果顯示以斜交角15°或20°鉋削層積竹材之加工粗糙度明顯低於手壓鉋鉋削面及砂磨面，而層積竹材之垂直纖維方向之粗糙度高出平行纖維者約1倍多；至於壓鐵與刀尖間隙對加工面粗糙度及電能消耗之影響並不顯著，然就加工面之觸感而言，以靜摩擦係數測得之結果顯示鉋光機鉋削層積竹材之優良平滑感，本試驗以高速鋼刀片鉋削層積竹材時，其刀尖後退速度與鉋削硬槭相近，且在設定之切削長度1250m下，刀具磨耗尚未很顯著。

關鍵字

層積竹材；粗糙度；切屑；靜摩擦係數；刀尖磨耗

並列摘要

Bamboo broadly planted in Taiwan is a special local raw material. Bamboo grows quite fast which could reach maturity 3-5 years. The strength of bamboo is higher than wood in the same specific gravity. It is reasonable to use bamboo as an alternative of wood in Taiwan. The objective of this study was to plan laminated bamboo using two-set stationary surface planer. The planned surface will be compared with sanding surface with hopes to be alternative of sanding process. In addition, in order to understand the wear mechanism of cutting edge, the worn edge of cutting tool will be analyzed after planning laminated bamboo. Results indicated that the values of surface roughness (Rmax) when cutting laminated bamboo by oblique angle of 15° or 20° was smaller than planning and sanding surface. The roughness of machining surface for the measuring direction perpendicular to grain was larger than the measuring direction parallel to grain about 1 time. The clearance of bar and cutting edge was not significant affected on machining surface and power consumption. As for the tactility of machining surface, static coefficient of friction showed the excellent tactility when cutting laminated bamboo with surface planer. The edge recession was the same as hard maple when laminated bamboo was cut by high speed steel. Furthermore, the bluntness of cutting edge was not yet obvious at the cutting length of 1250m.

並列關鍵字

Laminated bamboo ； Roughness ； Chip ； Static coefficient of friction ； Edge wear

國際替代計量

層積竹材表面精細加工與刀尖磨耗

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