1994 Fiscal Year Final Research Report Summary
Research on the development of harvester with the delimbing function of broad leaved tree
| Project/Area Number |
05556022
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Hokkaido University |
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Principal Investigator |
MINATA Katsuyuki Hokkaido Univ., Fac.Agr., Univ.Forests., Lecturer, 農学部・附属演習林, 講師 (20001505)
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| Co-Investigator(Kenkyū-buntansha) |
TERAI Akio Komatsu-Zenoa Co., Head Tec.Official, 研究開発センター, 技監
YOSHIDA Shigeich Hokkaido For.Res.Inst., Head Research Worker, 主任研究員
HIRAI Takuro Hokkaido Univ., Fac.Agr., Professor, 農学部, 教授 (20173205)
OHSATO Shoichi Tokyo Univ., Fac.Agr., Univ.Forests., Professor, 農学部・附属演習林, 教授 (30011935)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Forest machine / Delimbing knife / Trip-edge angle / Cutting strength / Broad leaved tree / Harvester |
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| Research Abstract |
Harvester is a logging machine that have functions of the highly efficient and the meny process. But until the present, machines with the delimbing function of the broad leaved tree are not made. Therefore, we have ccontinued research that attaches a delimbing function of the broad leaved tree to harvestor, from the fiscal year 1993. The structure for delimbing equipment was discussed at the first year. As a result of examination, we corresponded with the improvement of Knife.
Some Knives which had different front bevel angles and escape angles were made at the first stage. Delimbing ability of those knives were with Betula species. As the result, it was cleared that knives which formed 23 degree front bevel angle and 3 degree escape angle was proper.
In the fiscal year 1994, the development of the parcical knives was aimed from former results. That is, endurance and attaching method of the knives with its forms was discussed. As the result, the two-storied and flexibility knives were adoped.
7 types were estimated, the points of the estimation were as follows ; successfulness of cutting, length of residual branch, cutting strenghth. The application of the knives was discussed by those data. It was realized in the case of regular edge 23 degree was optirimal.
In this study, it was concluded that the improvement of the knives would enable the delimbing of broad leaved tree, especially in the secondary forest of betula species which have high stand density and straight stems.
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