1992 Fiscal Year Final Research Report Summary
Development of Sequential Powder Extrusion Process and Its application to Production of Functionally Gradient Materials
| Project/Area Number |
03555149
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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 |
金属加工(含鋳造)
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
YAMAGUCHI Katsuhiko Kyoto Inst.Tech. Dept. Mech. & Professor, 工芸学部, 教授 (90027805)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAKURA Norio ibid. Instructor, 工芸学部, 助手 (40163183)
IMATANI Shoji Kyoto Inst. Tech. Dept. Mech. & System Eng. Associate Professor, 工芸学部, 助教授 (70191898)
NISHIDA Toshihiko Kyoto Inst.Tech. Dept. Chem. & Associate Professor, 工芸学部, 助教授 (30027809)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Powder extrusion / Sequential extrusion / Optimal die angle / Functionally gradient material / Tube extrusion / Rod and tube |
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| Research Abstract |
A new extrusion process is proposed to facilitate the production of long rods and tubes by using metal powders as starting materials. In this process, the supply of small amount of powder into container and subsequent extrusion in short stroke is repeated one after another. As a model material, atomized aluminum powder is used and is directly extruded without canning and without blending with any binders and lubricants.
(1) It is confirmed that rods and tubes with relative density of 98-99 % and tensile strength of 80-90 % of solid aluminium can be produced without any problems. The optimal semi-die angle for powder extrusion exists around 30-40 degree, while 5-10 degree for the extrusion of solid metals.
(2) The strength of a rod produced by the hot extrusion is somewhat larger compared with that by the cold powder extrusion. However, the surface condition of extruded rods is not good due to the occurrence of galling.
(3) The axial stress and density distributions are calculated by the analysis using slab method together with the plasticity theory of porous materials proposed by Oyane and Shima. The analytical results show good agreement with the experimental ones.
(4) An attempt is made to produce so-called functionally gradient materials by the sequential powder extrusion, and the possibility is discussed.
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Research Products
(4 results)
