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Volume 16 (1966)
- Issue 6 Pages 282-
- Issue 5 Pages 217-
- Issue 4 Pages 169-
- Issue 3 Pages 113-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 16, Issue 4
Displaying 1-8 of 8 articles from this issue
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Kiyoshi Murayama1966 Volume 16 Issue 4 Pages 169-170
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (386K) -
Seiki NISHI, Takeo SHINODA1966 Volume 16 Issue 4 Pages 171-174
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe equilibrium diagram of Al-Be binary alloys, containing less than 5% (wt.) of Be, was investigated by thermal analysis and microscopic examination.
It was concluded that the diagram showed peritectic reaction, not the eutectic reaction which has hitherto been reported. The peritectic reaction at 646°C was represented as follows:
Liq.+β_??_αView full abstractDownload PDF (794K) -
Mamoru IMABAYASHI, Kohei TOMITA, Harero IWAMURA1966 Volume 16 Issue 4 Pages 175-181
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSStudies were made on the variation of hydrogen concentration in molten aluminum with holding time. Pure aluminum was melted under various melting conditions and some molten baths different in initial concentrations of hydrogen were obtained. The hydrogen ion concentrations of the molten metals were measured at regular intervals being held in the ordinary atmosphere.
The results of the experiment were summarized as follows: Equilibrium concentration of hydrogen widely varied with melting conditions and it did not correspond to a linear function of partial pressure of water vapor in the atmosphere.
The following conclusions were drawn from the above results of the experiment.
(1) The rate of hydrogen evolution from the molten metal depended upon the diffusivity of hydrogen through the oxide film.
(2) Equilibrium concentration of hydrogen was varied with hydrogen diffusivity and water vapor permeability through the oxide film as well as with the thickness of the film.View full abstractDownload PDF (863K) -
Shigeo MUROMACHI, Shizuo TADA1966 Volume 16 Issue 4 Pages 182-187
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSFundamental studies on the machinability of aluminum and its alloys were carried out for 12 kinds of Al, Al-Cu, Al-Mg, and Al-Si alloys which are commonly used. On the other hand, the effects of heat-treatment such as general stabilizing, annealing, and T4 and T6 treatment on the machinability of heat-treated alloys were also examined.
The results obtained were summarized as follows.
1) Al-Cu alloys showed lower cutting hardness than others; especially, the hardness of 11S was the lowest. Al-Mg-alloys showed the 2nd in ascending order of the hardness.
2) Most of alloys showing low cutting hardness had a large amount of intermetallic compounds in their structure.
3) The tendency of machinability in drilling was almost the same as that in turning.
4) The appearance of cutting face was very excellent in T4 or T6 treated samples, for example, in which fine intermetallic compounds are uniformly dispersed.View full abstractDownload PDF (864K) -
Kensuke KURIHARA, Shosaku KIKUCHI1966 Volume 16 Issue 4 Pages 188-193
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSFor the purpose of investigating the machinability of aluminum in comparison with other metals, following experiments were performed under the same conditions for all samples. Cutting tests were conducted on 4 sorts of metals; i.e., aluminum (99.5%), copper (99.6%), magnesium (99.9%), and carbon steel (C 0.25%) (in the above metals, each figure of % represents its purity) under the conditions of cutting speed of 100-400m/min., feed of 0.04-0.32mm/rev., and depth of cutting of 1.3mm by means of SHOUN KSA Type cutting dynamometer, dynamic strain meter, and electric recorder.
The following results were obtained.
(1) The increasing order of the measured values of cutting force was arranged as follows: Hg<Al<Fe_??_Cu (in which copper was the largest).
(2) It was observed that cutting force in copper or aluminum decreased with the increase of cutting speed or the decrease of feed; however, the force in magnesium was scarcely affected by cutting speed or feed.
(3) It would be estimated that the value of cutting force was less than a half of that of copper or nearly twice as great as that of magnesium.
(4) The increasing order of cutting ratio was arranged as follows: Al_??_Cu<Fe<Hg (in which aluminum was the smallest).View full abstractDownload PDF (839K) -
Shigeo ZAIMA, Susumu KAMO, Hideshi KAWAMATSU1966 Volume 16 Issue 4 Pages 194-199
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is supposed that there will be considerable variation in the mechanical properties (especially in machinability) of low pressure die castings according to their casting conditions such as temperature of dies, casting temperature, casting pressure, etc. In this paper, there is reported on the experiments pursued for the purpose of observing the practical state of the machinability of low pressure die castings and also examining the effects of casting conditions (especially, the casting pressure) on their mechanical properties. Lautal and copper silumin were used for the specimens for cutting tests. The machinability was discussed by cutting resistance, roughness of finished surface, and chip formation in turning and drilling.
As the results, the low pressure die castings of lautal and copper silumin showed good machinability from the viewpoint of cutting resistance in turning; especially, the latter showed much better results. The cutting resistance seemed to be slightly larger at the higher casting pressure, but the roughness of finished surface was not so good owing to troublesome for mation of built-up edges under some conditions. However, the surface of copper silumin showed better results than that of lautal. The machinability in drilling was also examined and it was found that the results in drilling were corresponding to those in turning.View full abstractDownload PDF (983K) -
Toshimi YAMANE, Jitsuhiko UEDA1966 Volume 16 Issue 4 Pages 200-205
Published: July 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSMechanical properties such as tensile strength, hardness, elongation, and Charpy impact value, as well as optical microstructures and thin foil electron microstructures of a commercial pure titanium plate were investigated to find the cause of ductility deterioration at the temperatures below 550°C.
The following results of experiments were obtained.
(1) Densities and figures of deformation twins and dislocations caused by rolling at room temperature were different from those of at high temperatures.
(2) Cell structures and twin-like figures were observed in specimens rolled at 250 and 400°C by transmission electron microscopy.
(3) The cause of ductility deterioration at between room temperature and 550°C was considered to correspond to the relation of the occurrence of slip and deformation with temperature in various systems.View full abstractDownload PDF (2059K) -
1966 Volume 16 Issue 4 Pages e1
Published: 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (27K)
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