Development of wood forming method with high hydrostatic pressure that achieves large deformation and high strength

开发实现大变形、高强度的高静水压木材成型方法

• 批准号: 22K04773
• 负责人: 梶川 翔平
• 金额: $ 2.66万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K04773/
• 关键词: 木材・木質材料; 塑性加工; 静水圧効果; 大変形; 金型

2022年度は，密度が異なる2種類の材料（スギ，ウリン）に対して簡易金型を用いた鍛造加工実験を行い，鍛造加工時における静水圧状態が小型容器の成形性に及ぼす影響を調査した．また，高静水圧プレス金型の設計および製作を行った．主な実績は以下の通りである．(1) 鍛造加工時において，内部に空隙が多いスギ材と比べ，高密度なウリン材の場合に流動変形が生じやすい傾向を示した．スギの場合，圧密変形量は大きいものの，圧密完了後の流動変形が生じにくい．(2) プレス方向に対する木材の年輪方向によって，変形挙動は大きく変化した．繊維方向に圧縮する場合，繊維間の剥離が生じやすく，パンチが接触する部分のみが圧密され，高密度化しやすい．一方，半径方向に圧縮する場合，材料全体が圧密・高密度化しやすい傾向を示した．特に，加工初期から高密度なウリン材の場合，半径方向圧縮の場合において，高密度化からの流動変形が生じやすいことがわかった．(3) 形状が異なる種々のパンチを用いることによって，鍛造加工時における材料の静水圧状態を変化させた結果，静水圧が高いほど型の端部まで充填しやすく，成形品密度も向上した．一方で，型端部にて材料を十分に圧密するためには，金型・木材間の摩擦の低減も必要であることが示唆された．(4) 高静水圧プレス金型の設計を行った．本金型を用いることによって，下部から背圧を加えた状態で，木材をプレスし，変形させることができる．簡易金型を用いた鍛造加工実験の結果に基づき，必要となる背圧や，金型の表面処理の検討なども完了した．

In 2022, は, density is different, 2 types of materials (スギ, ウリン), に対して simple gold type を is forged with いたProcessing is carried out, and the influence of the static water pressure state on the formability of small containers during forging processing and its influence are investigated.また, high static water pressure プレスGold type design および production を行った. Mainly the following の通りである. (1) During the forging process, there are many internal voids and the material ratio is high. In the case of high-density materials, the flow and deformation tendencies are not obvious. In the case of スギの, the amount of pressure and density is large, and the amount of pressure and density is large, and the flow and shape after the density is completed is じにくい. (2) The direction of the trees is the direction of the growth rings of the wood, and the direction of the growth rings of the wood is the direction of the growth rings. In the case of shrinkage in the 1-dimensional direction, peeling off between the 1-dimensional planes, contacting parts of the 1-dimensional space, densifying the parts, and densification. On the one hand, when there is no pressure shrinkage in the radial direction, the tendency of the overall material to become denser and denser is shown. Special features include high-density なウリン materials in the early stages of processing, radial compression in the radial direction, and high-density flow and reshaping. (3) The shape is different and the material is in a still water pressure state during forging processing. The result of を変化させた, the static water pressure is high, the end part is filled, and the density of the molded product is high. On one side, the material at the end of the mold is very dense, so it is necessary to reduce the friction between the metal mold and the wood. (4) High static water pressure プレスGolden designの行った． The main gold type is made of いることによって, the lower part is から back pressure を plus えた condition で, the wood is をプレスし, and the shape is させることができる. The simple metal type is made by forging and processing, and the result is the base. The necessary pressure is the back pressure, and the surface treatment of the gold type is finished.