Study on the Drilling Performances of Wood-based Materials

• Main Authors: Ting-Ho Tsai, 蔡庭荷
• Other Authors: Wen-Ching Su
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/88494566211398095756

碩士 === 國立嘉義大學 === 木質材料與設計學系研究所 === 102 === Drilling is an important and indispensable process for assembling the components of wood-based panel furniture. In the drilling process, if the drill type is inappropriate or the spindle speed and feed rate are unsuitable will cause the wood fibers not being cut incompletely. Defects such as burr, split and delamination around the entrance surface and exit surface of borehole will appear. In this paper, computer numerically controlled router was used to conduct the drilling investigation of grand fir(Abies grandis), poplar(Populus spp.) and MDF(Medium density fiberboard). Experimental variables are drill type, spindle speed and feed rate, there are 36 combinations. Furthermore, the instantaneous temperatures were measured at the touching and leaving of drill bit the sample. In order to investigate different machining conditions on the quality of these three wood-based materials, defect factors, roughness of borehole wall will be evaluated. The optimum conditions of drill type, spindle speed and feed rate during processing these three wood-based materials were suggested. Reduced defect rate will decrease the cost of labor and time. Experimental results revealed that in the case of machining grand fir, it is recommended to use brad-point drill, the ideal machining conditions were spindle speed 7250 rpm and feed rate 1000 mm/min; twist drill is for processing poplar, the ideal machining conditions were spindle speed 5250 rpm and feed rate 1000 mm/min; brad-point drill is for processing process MDF, the ideal machining conditions were spindle speed 5250 rpm and feed rate 1000 mm/min. To sum up, twist drill, spindle speed 5250 rpm and feed rate 1000 mm/min could get good quality for these three wood-based materials.