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Volume 35, Issue 409
Displaying 1-10 of 10 articles from this issue
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Velocity, Resistance and MicrostructureTeisuke SATO, Naoharu TAKAGI1969 Volume 35 Issue 409 Pages 74-80
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSRecently, high energy rate forging has been developed.
In a high speed stamp forging, the indentation velocity reaches to the range of several decades or 100m/s.
High speed indentation involves numerous interesting problems from the view points of plasticity, metal physics and metallurgy. The high speed indentation for mild steel test piece has been investigated using cylindroconical punches with several cone angles.
High speed was obtained by firing the gun powder.
This paper deals with the comparisons on the velocity, resistance and microstructure in both cases of dynamic and static indentations. The results obtained are as follows.
1) High speed indentation gets deeper depth than that of static one.
2) The zone of the microstructure deformed by the high speed indentation is smaller than obtained in the static case.
3) Mechanical twins are observed in the case of high speed indentation.
4) The coefficient of friction in the high speed indentation seems to be smaller than that of static one.View full abstractDownload PDF (7013K) -
Eiichi SUGANUMA1969 Volume 35 Issue 409 Pages 81-86
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes an experimental investigation of the electrolytic grinding process of copper. Some results of experiments are presented with current-potential characteristics, electrochemical removal amount and surface state of copper in several electrolytes and the anodic behaviour of copper is discussed about the selection of electrolyte for the process. Data are presented on the relation of electrolytically ground stock removal on copper to current densities for KCl and NaNO3 5% aqueous solutions. Finished surfaces were examined opitically and by electron microscopy of replica taken from selected areas. The Faraday current efficiency of the process with KCl electrolyte was found to be over 100%. This is thought to result from the effect of chlorine ion which attacks the surface of copper. It was found that copper could be finished at relatively low current densities (3 amps per sq cm at most) by means of electrolytic grinding process with equal 5% mixture of KCl and NaNO3 and that the stock removal rate was 25mg/amp·min.View full abstractDownload PDF (5722K) -
A Study on High Pressure Mechanical Seal (3rd Report)Masahiko YAMAMOTO1969 Volume 35 Issue 409 Pages 87-93
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe thermal deformation of the sliding surfaces, as well as the pressure deformation, may greatly influence to the seal performance of a high pressure mechanical seal. This paper describes about the calculating method of the transient temperature distribution and the thermal deformation.
And also, the followings are obtained.
1) In any actual boundary conditions, the sliding surfaces are deformed to convex shapes. So the outside type seal shows unstable seal characteristics, on the other hand the inside type seal shows stable one for full film lubrication.
2) The thermal deformation depends on the axial temperature gradient rather than the radial one.
3) The sliding speed and the seal pressure have an effect to the increasing of the surface temperature.
4) On general outside type mechanical seal at the transient condition, the rotor deforms by 0.02-0.05μ/°C and the stator deforms by 0.01-0.04μ/°CView full abstractDownload PDF (6336K) -
Keiji OKUSHIMA, Norihiko NARUTAKI1969 Volume 35 Issue 409 Pages 94-100
Published: February 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSTurning test was performed by a carbide tool on several carbon steels having various carbon contents and the worn surface of the tool and its cross-section were surveyed by the electron probe X-ray micro-analyzer in order to estimate the wear mechanism of carbide tools. Relation among the tool wear, cutting temperature, thickness of the diffused layer and the hardness of work material was investigated through the experimental findings concerning the decrease of cobalt content on the tool surface, the diffusion of carbon, and the weakening of tool.
It is found that the tool wear is caused mainly by the diffusion of carbon from the carbide constituents of the tool material into the work steel, which changes the structure of carbides and weakens the tool crystals.
From both the experimental data and the theory, it is proved that the wear velocity of carbide tool is resticted by the diffusion velocity of carbon through the matrix of the tool. And the thickness of the diffused layer beneath the tool surface increases as the cutting temperature is raised such that the hardness of work material is decreased, and as the carbon content of the work material is decreased.View full abstractDownload PDF (3066K) -
The Formation and the Effect of the Tool Wear in the Vinyl Resin and Paper Laminated Phenol ResinAkio KAMOGAWA1969 Volume 35 Issue 409 Pages 101-106
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe first half of this study has clarified some effects of rake angle on cutting resistance, finished surface roughness, flank wear, and cutting temperature in the orthogonal cutting of Vinyl choloride resin.
1) As cutting time elapses, flank wear, horizontal force, vertical force and cutting temperature increase.
2) A larger rake angle makes the cutting temperature higher.
3) The rake angle (0 deg.) shows higher horizontal force than the one (-10 deg.)
4) The rake angle (0 deg.) shows better surface roughness than the one (-10 deg.)
The second half of this study has clarified some effect of tool materials on cutting resistance, flank wear and cutting surface roughness in the orthogonal cutting of paper-laminated phenol resin.
1) As cutting time elapses, flank wear, horizontal force, vertical force, and cutting surface roughness increase.
2) Horizontal force, flank wear, and surface roughness, depended upon tool materials.View full abstractDownload PDF (4663K) -
Ichiro IDA, Makoto SUZUKI, Mitsuo KAJITA1969 Volume 35 Issue 409 Pages 107-115
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn machining GaAs as a mirror-finished surface without damage for the use in ultra high frequency semiconductor device, the optimum method should be established together with a deeper understanding of worked layers, leading to the trial making of an ultramicroscratching hardness tester with a specified scratching direction. This tester having been used, hardness is estimated on polished, chemically polished and epitaxially grown surfaces. The results are summarized as follows : (1) Microscratching is realized under loads of 10300mg with an accuracy of orientation for less than 1°. (2) Along [110] on (100) of GaAs surfaces, the constant hardness is obtained from each worked surface when the depth is more than 1500Å. (3) While hardening for a metallographically polished surface and softening for an optically polished surface are recognized, the tendency of softening is found on an epitaxially grown surface whose surface texture is wavy. Also, a chemically polished surface exhibits the tendency of softening generally. (4) The origination of slip lines correlates with the kind of worked surfaces concerning scratching load.View full abstractDownload PDF (14918K) -
On the Possibility and the Types of ChipYasuo NASU1969 Volume 35 Issue 409 Pages 116-121
Published: February 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn this report, it is experimentally studied by observing the types of chip whether there is a possibility of the following phenomenon, that a change from a cutting process to the other cutting one takes place, which is due to a change in the friction mechanism at the tool-chip interface being affected with the temperature and the force system in the shear region and its interface. The experiments were performed cutting industrial pure iron (0.012%C) in the as-received condition with carbide tools (S2) under various cutting conditions; cutting speed of 10150m/min, feed of 0.0340.134mm/rev, and depth of cut of 0.10.5mm.
As the result, it is revealed that the phenomenon occurs with two kinds of cutting process appearing alternately and that it is affected by cutting conditions, especialy by the cutting speed, as shown in the test performed at about the cutting speed of 3070m/min, and also it is revealed that when it occurs, two new type chips are found, both of them are consisted of two part, one of which is a flow type chip and the other is either a flow type chip or one element of shear type chip.View full abstractDownload PDF (7410K) -
[in Japanese]1969 Volume 35 Issue 409 Pages 122-128
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (3179K) -
[in Japanese]1969 Volume 35 Issue 409 Pages 129-134
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (8676K) -
1969 Volume 35 Issue 409 Pages 135
Published: February 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (233K)
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