| Project/Area Number |
63460082
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械工作
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| Research Institution | Shizuoka University |
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Principal Investigator |
NAKAMURA Tamotsu Shizuoka University, Faculty of Engineering, Professor., 工学部, 教授 (70023322)
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| Co-Investigator(Kenkyū-buntansha) |
IMAIZUMI Haruki Shizuoka University, Faculty of Engineering, Technical Officer., 工学部, 教務員
HIRAIWA Masashi Shizuoka University, Faculty of Engineering, Assistant., 工学部, 助手 (70022027)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Powder Forming for High Density / Metal Matrix Composite / Muti-Ram Hydraulic Press / Compacting of Powder / Dissimilar Metal sheets / Sintering / Thin-Walled Cup / Strip-Foil / 高強度複合材料 / 焼結底付き薄肉缶 / 中空薄肉管 / 薄板 |
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| Research Abstract |
(1) A multi-ram hydraulic press was designed and made for investigating the tribo-forming processes of a thin-walled cup and a strip-foil.
(2) The forming and cladding of dissimilar metal sheets have been investigated by the tribo-extrusion process of thin-walled cup. The cladding cups for various combinations of dissimilar metal sheets could be formed with the reduction in area Re=90 % and the punch pressure less than about 2.4 GPa.
(3) The compacting pressures for the green density d_o=90 % were about 0.3, 0.7, 0.8 and'O.9 GPa for an aluminium, a titanium, a copper and an iron, respectively, The thin-walled cups of aluminium and titanium could be formed with the relative density of 98 %.
(4) The tribo-thinning process for producing a strip-foil from aluminium powder was investigated. The very thin aluminium foil of about 0.05 mm in thickness could be formed at the extrusion ratio R=200 with a considerably low punch pressure. The ultimate tensile strength of the foil strips formed at R=10-200 were about 250-300 MPa, which were rather higher than the value of that formed from the solid block by the tribo- thinning process.
(5) The aluminium powder mixed with the alumina powder of 10, 20 and 30 wt% were compacted into the relative density of about 90 % into the cylindrical green parts and could be formed into the thin-walled cups by the conventional backward extrusion and the tribo-extrusion. The cylindrical parts which the powder mixtures of aluminium and alumina were compacted and sintered at 600ﾟC could be formed into the thin- walled cups by the both extrusion processes. The relative density of thin-walled cups formed by both the extrusion processes was increased up to about 100 % in the case of pure aluminium powder, but the density for mixture powder of aluminium and alumina could not be increased enough.
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