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Volume 39, Issue 9
Displaying 1-11 of 11 articles from this issue
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Kimiyoshi KITAZAWA, Mutsumi TSUJIDE, Masaru KOBAYASHI1989 Volume 39 Issue 9 Pages 609-615
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe curling behavior in aluminun was investigated to clarify the condition for curling during the tube end spherical flaring. The influence of die radius R, lubricant, ratio of the tube wall thickness to diameter t0/d0, work hardening exponent n and forming speed V on the condition for curling was investigated in the aluminum tubes. It was found that the curling took place when the apparent die angle α' at the initial contact point of a tubular specimen to the hemispherical die was larger than the critical die angle αS with the conical die. Furthermore, the multi- and single-stage methods to prevent the curling in the case of the conical die were proposed and experimentally examined. The curling mode was prevented under the proposed preventing condition. Thus, these results suggested that the curling mechanism in the hemispherical die was similar to that in the conical die.View full abstractDownload PDF (1518K) -
Mitsugu MOTOMURA, Takeo SHIROTORI, Hiroshi ONO1989 Volume 39 Issue 9 Pages 616-620
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSRecently, topics of CAD systems have been partial to an achievement of difficulties. For example, some Artifical Intelligence CAD systems are only focused on an accomplishment of Artifical Intelligence techniques, but they may not consider what systems will be wanted in the practical field. We researched how CAD systems in the aluminum forging companies should be, and developed the CAD systems for them. The developed systems perform the billet estimate, drawings (CAD) and the die analysis with the slab method by a personal computer. This paper reports an example showing that more fundamental techniques greatly improve the designings.View full abstractDownload PDF (592K) -
Koichi HATANAKA, Masanobu FUKUI, Yoshikazu MUKAI, Kikuo TOYOSE1989 Volume 39 Issue 9 Pages 621-626
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe organic-coating adhesion after drawing was investigated in relation to the pretreatment of aluminum. Chromate phosphate conversion coating showed good organic-coating adhesion after drawing in the case of Cr of about 10mg/m2. Much more Cr, however, resulted in the deterioration of the adhesion property by heat treatment before the organic-coating. Anodizing produced high adhesion strength on the flat plate. However, drawing caused microcracks and the organic-coating delaminated from the side wall of the drawn cup. On the other hand, the organic primer showed good adhesion property even after drawing. The interface of delamination was investigated by SEM and XPS. The deterioration of the adhesion property by drawing was due to the cohesive failure of pretreated films and the change in the surface morphology. These results indicated that the pretreatment for drawing was required to produce high formability as well as high adhesion property.View full abstractDownload PDF (1396K) -
Hiroshi ONO, Mitsugu MOTOMURA, Katsuya INANA1989 Volume 39 Issue 9 Pages 627-633
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSA free shape forging process is suitable for making products with various shapes and dimensions. This forging apparatus consists of a die and some punches applying loads to a specimen individually to vary the die configuration. In this paper, the deformation and load properties were investigated in case of applying this forging process to the axisymmetric extrusion-forging of hot aluminum specimen. In the experiments, three types of the lower dies having cylindrical hole or concentric ring hole in their bottom and the upper die set composed of three punches of the shape of two concentric rings and one cylinder were prepared. One of the punches applied a quasi-static load, one at a time, to a hot aluminum specimen. Dimensions of the specimen and load were measured during forging. The maximum load and the final shape of the specimen in this forging process were compared with these in the conventional forging process. In result, it was shown that this forging process was able to forge the products of the various shapes by one set of dies. The effects of both the configuration of the lower dies and control procedure of the punches on the deformation pattern were discussed. The maximum load of this forging process was smaller than that of the conventional forging process.View full abstractDownload PDF (985K) -
Yuji KATSUMURA, Masaru YAGI, Hisashi SUZUKI1989 Volume 39 Issue 9 Pages 634-638
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSSintered WC, WC-2 and 4%Co compacts were used as substrate. The cobalt content near substrate surface and the surface roughness of substrate were varied. The diamond deposited cemented carbide tools were prepared by CVD and the cutting performance was studied for Al-18%Si alloy. The adhesion between substrate and diamond film was improved with decreasing the cobalt content near substrate surface and with increasing surface roughness. The cutting performance of diamond deposited tools became excellent as the adhesion between substrate and diamond film was improved.View full abstractDownload PDF (1291K) -
Minoru ICHIMURA, Yasushi SASAJIMA, Mamoru IMABAYASHI1989 Volume 39 Issue 9 Pages 639-645
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSHydrogen solubility (S(10-2cm3g-1atm-0.5)) in Al-(0-50mass%) Cu alloys were measured by a desorption technique for the thermally gas-charged cylindrical samples which were solidified unidirectionally in the pure nitrogen gas flow (sample ND). The solubility was compared with that in samples melted and cast in vacuum (sample VM) and with that in samples melted in air and cast into a metal mould (sample AM). Since the solubility S (ND) was almost equal to S(VM), samples ND were found to have no voids of gas defects such as porosity and cavity. In the region of α-solid solution (Cu<5.7mass) S (ND) was independent of copper content, therefore, the hydrogen solubility in the α-solid solution with the maximum Cu solubility (Cu=5.7mass%) was equal to that of pure aluminum (Sα=S (Al)). When the copper concentration was higher than 5.7mass%, S (ND) increased linearly with the increase in the volume fraction of the θ-phase (fθ) and got to the higher hydrogen solubility in the θ-phase (Sθ), according to the equation S (ND)=Sα(1-fθ)+Sθfθ. S (AM) was greater than S (ND) due to the trapped hydrogen gas in the voids. In the alloy of teh eutectic composition (33 mass%Cu) which had little voids, S (33AM) was smaller than S (33ND). This was attributed to a non-equilibrium or suppressed charging of hydrogen due to the trapping of hydrogen in a finer metallic structure of a sample AM.View full abstractDownload PDF (1566K) -
Committee Of Chemical Analysis / SC2 Japan Light1989 Volume 39 Issue 9 Pages 646-650
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
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Hideo YOSHINAGA1989 Volume 39 Issue 9 Pages 651-659
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
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Hiroshi TOKISUE1989 Volume 39 Issue 9 Pages 660-663
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (476K) -
Masato FUJITA1989 Volume 39 Issue 9 Pages 664-683
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
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Toyoji USHIODA1989 Volume 39 Issue 9 Pages 684-686
Published: September 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (302K)
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