スギ大圧縮強化円筒パネル成形の可能性

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Nowadays, Sugi (Japanese cedar, Cryptomeria japonica D. DON) accounts for half of the wood resources planted in Japan and is highlighted as a sustainable wood resource. However, the efficient use of Sugi harvests is limited, because the strength of Sugi is considerably lower than those of hardwood, such as Buna (Japanese beech, Fagus crenata BE.) and Keyaki (Zelkova serrata MAKINO), commonly used in the manufacture of furniture. Here, we report the possibility of a closed-die forging method which can convert low-strength lumber from Sugi plantations into high strength panels. Green wood specimens cut from a Sugi log were boiled and large compressed into cylindrical panels using closed die forging operations. The cylindrical panels were then permanently fixed using a steaming treatment. The deformation behavior, forming limit and strength properties were investigated experimentally. It was found that the proposed closed die forging method is comparable to the conventional bending method in terms of the forming limits. The limiting ratio of the radius of curvature to the thickness was about 12 for the modified closed die forging method using the Thonet-type technique, which prevented cracking, although the limiting ratio is about 30 for the conventional bending method. Furthermore, results showed that the strength of the cylindrical panels can be improved by the closed-die forging method; the bending strength of the cylindrical panel with 0% moisture content was the same as that of aluminum, and with 15% moisture content, increased by approximately 25% over those of Buna and Keyaki lumber panels at the same moisture content. It was, therefore, concluded that the proposed method for producing high strength panels could be considered to be a promising process from the viewpoint of the efficient use of harvested Sugi.
一般社団法人日本機械学会の論文
1997-12-25

スギ大圧縮強化円筒パネル成形の可能性

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