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Volume 31, Issue 12
Displaying 1-9 of 9 articles from this issue
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Kyoichi IKEMURA1981 Volume 31 Issue 12 Pages 759-760
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
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Hiroshige MURATA, Tsuneo TAKAHASHI1981 Volume 31 Issue 12 Pages 761-768
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of the viscosity of lubricating oils on the deep drawability of 1100-H18, H24 and 0 thin sheets and on the surface condition of deep drawn cups were studied. The limited drawing ratio increases with increasing the viscosity of lubricating oils particularly at low drawing speed. H24 sheets have the maximum LDR. 2.15. The amount of metal transfer by adhesion of the deep drawn sheets especially H18 and 0 to die surfaces increases at low drawing speed and decreases remarkably at high drawing speed. The use of high viscosity oils results in roughening the cup surface particularly of the O-sheets up to 4μm in maximum roughness.View full abstractDownload PDF (2009K) -
Ikuo HAGINOYA, Tatsuichi FUKUSAKO1981 Volume 31 Issue 12 Pages 769-774
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe internal oxidation temperature, a criterion for oxidation supressivity, of a molten Al-10%Mg alloy rises in the atmosphere containing CO2 15% or more and attains the maximum at about 70% of CO2. The oxide film on the alloy is composed of fine particles 0.1 to 0.3μm in size independently of atmosphere. If oxidation is supressed, the oxide film wrinkles at intervals of several microns. Lowering the internal oxidation temperature in the atmosphere containing CO2 more than 70% is caused by pinholes formed in the oxide layer at its forming stage. The internal oxidation temperature of molten Al-5%Mg alloy rises in the atmosphere containing CO2 10 to 70%, but is not so susceptible to the CO2 concentration. The internal oxidation temperature of molten Al-10% Mg alloy containing 0.001 to 0.004% Be riese drastically in the air and further rises in the air-30% CO2 atmosphere. The alloy containing Be 0.002% or more is unsusceptible to the atmosphere.View full abstractDownload PDF (2014K) -
Kazuo TACHIHARA, Tatsumi TOZAWA, Eiichi SATO1981 Volume 31 Issue 12 Pages 775-779
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAn acoustic emission technique was used to investigate galvanic corrosion between 6063-T5 alloy and various metals such as Cu, Ni, stainless steel and Zn in 0.5M NaCl aqueous solution. Pits are found in the alloy coupled to Cu, stainless steel and Ni which have nobler potentials than 6063-T5, and acoustic emission is also detected. The number of pits on the alloy and the activity of acoustic emission are reduced by annealing the alloy. The addition of Cu ions to the 0.5M NaCl solution promotes pitting corrosion and the activity of acoustic emission. The occurrence of acoustic emission is attributed to hydrogen gas generated by pitting corrosion. The acoustic emission technique is available for monitoring the corrosion reaction.View full abstractDownload PDF (665K) -
Shigeo ZAIMA, Masashi SUZUKI, Shigeru YAMADA1981 Volume 31 Issue 12 Pages 780-786
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAvailability of CBN tools for dry and wet cutting of hypereutectic Al-Si alloys was examined. In low speed dry cutting at a cutting speed 2m/s, the tool deposit adheres to the tool flank and the plateau is formed. Particularly in cutting of the Al-16%Si alloy, the grooving wear occurs on the cutting edge portion which corresponds to the depth of cut owing to scratching of Si particles in the chip. If the Si content increases, the grooving wear is lightened and the width of flank wear reduces. The CBN tool may be applicable to a certain extent to low speed dry cutting. But the CBN tool causes heavy tool wear in low speed wet cutting and wet dry high speed cutting at a cutting speed 10m/s, and is unapplicable.View full abstractDownload PDF (1170K) -
Shigeo ZAIMA, Masaji IIO, Ying Chih HUANG, Kozo ARAI, Ichizo TSUKUDA1981 Volume 31 Issue 12 Pages 787-792
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA new type of free cutting alloy was developed which is basically of an anticorrosive and surface treatable Al-Mg-Si system and contains Pb, Sn and others for machinability. Its drilling machinablity was compared with those of a free cutting aluminum alloy 2011, afree cutting brass and a free cutting steel. The drilling machinability was examined on 5056 alloys having different compositions for different usages and processing and on high strength 2017 alloy. The developed alloy has good drilling machinabilities such as reduction of drilling time and easy chip treating next to 2011. The 5056 alloys having different compositions have nearly the same and inferior drilling machinabilities.View full abstractDownload PDF (838K) -
Shigenori HORI, Shigeoki SAJI, Akira TAKEHARA1981 Volume 31 Issue 12 Pages 793-797
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe structure in Al-Zr alloys solidified under various cooling conditions were investigated. A relation between crystallization of the metastable Al3Zr and grain sizr of solidified crystals is discussed. A complete solid solution is attained in the alloys solidified at a high cooling rate or in the alloys containing smaller amounts of Zr. The metastable phase Al3Zr with L12 type crystal structure or the equilibrium phase Al3Zr with DO23 type crystallizes primarily with decreasing cooling rate and with increasing Zr content. The metastable Al3Zr grows into fine dendritical shape followed by solidification of α-aluminum. An angular structure is, therefore, observed within a grain. The dendritical metastable Al3Zr grows in the <111> Al3Zr (=Al) direction differently from aluminum. The average grain size of angular structure decreases with increasing cooling rate. The number of grains including the angular structure increases, and the average grain size of solidified crystals decreases with increasing Zr content at the same cooling rate. The dendritical metastable Al3Zr acts as an effective nucleus for crystallization of α-aluminum and has a grain refining effect.View full abstractDownload PDF (1517K) -
Yoshikatsu HAYASHI, Toshio SUZUKI1981 Volume 31 Issue 12 Pages 798-804
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
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Masao TAKAHASHI, Kenichiro OHTA1981 Volume 31 Issue 12 Pages 805-819
Published: December 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2204K)
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