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Volume 35, Issue 410
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1969 Volume 35 Issue 410 Pages 139-145
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
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Work Hardening Behaviors of MetalsTeisuke SATO, Naoharu TAKAGI, Masahiro HIRATA1969 Volume 35 Issue 410 Pages 146-152
Published: March 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 the range of several decades or 100m/s.
High speed indentation involves numerous interesting prolAm3 from the view points of plasticity, metal physics and metallurgy. The high speed inlentaticn for a mild steel has been investigated using cylindro-conical punches of several cone angles.
This paper reports a comparison of Vickers' hardness distribution in dynamic indentation with that in static one. The high speed was obtained by firing the gun powder.
When the cone angle of punch is 30°, the indentation speel has little effect on the distribution of Vickers' hardness, whereas when the cone angle is 60° or more, the indentation speed is primarily influential on the distribution of Vickers, hardness. This means that in a high speed indentati3n, the isohardnes lines in front of the top of the punch are nearly straight and perpendicular to the direction of the punch movement, however in a static indentation, the isohardness lines become almost circular around the top of the punch.
Agreement of the distributions of strain and hardness has teen verified by recrystallizing the stress zone.View full abstractDownload PDF (1608K) -
On Edge Roughness by WearSadaji OKAMOTO, Sadamasa AMMI, Noritake YAMAZAKI1969 Volume 35 Issue 410 Pages 153-158
Published: March 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSApplication of ceramic tools is limited at present, because ceramics are comparatively weak against mechanical and thermal shocks. The wear mechanism of ceramic tools is also different from that metallic tools.
In this study, theoretical and experimental investigations on the relation between the roughness of initial cutting edge and that of worn cutting edge with alumina-based ceramic tools have been made.
The change of roughness of cutting edge at the initial stage of wear has been analyzed theoreticaly under such assumption that the wear of ceramic tool at the first stage of cutting is caused by cleavage and separation of alumina grains. And the result of the theoretical calculation has been confirmed by the orthogonal cutting tests of a steel.
The main findings are as follows :
(1) The experimental results on the behaviour of the roughness of cutting edge as the tool wear proceeds coincide qualitatively with those calculated.
(2) The roughness of worn tool edge becomes to be almost constant regardless of its initial state of finish, and the final value of roughness seems to be related with the grain size of alumina.View full abstractDownload PDF (1121K) -
1969 Volume 35 Issue 410 Pages 158
Published: 1969
Released on J-STAGE: November 19, 2010
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Sukemitsu ITO, Nobuo SHIKATA1969 Volume 35 Issue 410 Pages 159-163
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCarbon steel (S15C) and austenitic stainless steel (SUS27) were electrochemically machined by a square wave current. The effects of the duty factor and the frequency of the current on the machining characteristics of sodium chloride solution containing potassium nitrite as an inhibitor were experimentally examined. The main results are as follows.
(1) In the case of carbon steel (S15C) the surface finishes by square wave current within the ranges of frequency from 150 to 333.3c/s and duty factor from 35.7to 83.3% are better than those by direct current or single-phase half-wave rectified current.
(2) In the case of austenitic stainless steel (SUS 27) the surface finish is not affected by the variations of the duty factor and the frequency of the current. The concentration of potassium nitrite permissible to be added is less than that of single-phase half-wave rectified current but the surface finish is rather better.View full abstractDownload PDF (4531K) -
Akira YAMAMOTO, Simesu NAKAMURA1969 Volume 35 Issue 410 Pages 164-168
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the previous paper a cutting-beginning-model was experimentally proposed, in which chip formation begins when the end of contact of piled-up material at the rounded part of cutting edge reaches the same height as the center of that rounded part.
In this paper, the validity of the model is investigated by varying the rake angle of tool and utilizing the cutting force vector diagram. And then, the flow behavior is discussed from the variation of fractional friction force acting on the successively increased contact area with the advance of tool.
The main results as follows.
(1) In the range of positive rake angle, rake angle has no effect on the cutting force and sliding length, before the cutting-beginning-point. After this point the cutting force changes in accordance with the magnitude of rake angle.
(2) The direction of cutting force vector at the cutting-beginning-point is constant irrespective of the magnitude of roundness radius, material hardness and rake angle. But, the magnitude of vector is proportional to roundness radius and material hardness.
(3) It is shown from the result of friction force analysis that the piled-up material begins to flow as a chip at the cutting-beginning-point.View full abstractDownload PDF (701K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1969 Volume 35 Issue 410 Pages 169-175
Published: March 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSMachinability of calcium deoxidized steel is studied in various machining processes and grinding process. It is found that the calcium deoxidized steel shows better machinability than silicium deoxidized steel in surface milling and in gun-drilling with carbide tools. On the other hand, the former steel has shorter tool life in drilling with a high speed steel tool and in grinding with an alundum wheel than the latter. It is also confirmed that the various mechanical properties, cold-formability and weldability of both steels show no significant difference.View full abstractDownload PDF (1140K) -
Masao TOMII1969 Volume 35 Issue 410 Pages 176-183
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, the relations between the individual errors of a gear and the angular position error of the gear are studied.
The angular position error of a gear can be expressed with a Fourier expansion formula, and the equation which expresses the relation between the pitch error and the angular position error is obtained. From the study following results are obtained.
1. In evaluating the angular position error from the individual errors, the essential errors are accumulative pitch error and the tooth profile error. The former is to be used to evaluate the lower harmonics components of the Fourier expansion of the angular position error and the latter is to be used to evaluate the higher harmonics components of it.
2. It is not advisable to obtain the maximum value of the accumulative pitch error from the measured values of the individual pitch error. As the measurement error in the individual pitch error measurements are also accumulated and maximum value has largely changed. The value is rather to be obtained from the measured value of z/2 pitch error measurement or from the value of run-out error measurement.View full abstractDownload PDF (1307K) -
Seiki MATSUI1969 Volume 35 Issue 410 Pages 184-188
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe superfinishing process of ferrite and soda glass was investigated experimentally. In this experiment, the stock removal, the superfinishing resistance and the surface roughness were measured.
The main results of experiments are as follows.
1) Under light loads the shape of scratched traces on ferrite and soda glass is similar to that on metal.
2) Silicon carbide wheels are more suitable for grinding of ferrite and soda glass than aluminum oxide wheels.
3) The superfinishing resistance of ferrite and soda glass is expressed as the sum of two terms, ploughing and frictional. The ploughing force is proportional to the stock removal. Under the conditions used, the experimental constant C' of ferrite and soda glass is about 0.4 and 3 respectively, where C' is equivalent to the coefficient of piling-up in metal superfinishing.
4) The value of surface roughness of ferrite and soda glass roughly superfinished is about 1μ Hmax and the value finely superfinished under about 1μ Hmax.
5) The mean value of surface roughness is proportional to (M/N1/2) 2/3, where M is the stock removal per unit area and N the load per unit area.
6) Superfinishing process of ferrite and soda glass is performed successfully in place of ordinary lapping process.View full abstractDownload PDF (922K) -
Yoshinobu TANAKA, Toshiaki UEGUCHI1969 Volume 35 Issue 410 Pages 189-194
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper concerns the cooling effect of wheel-work environment, comparing the grinding in vacuum. By choosing the glass as work piece with its low coefficient of thermal conduc; ivity, it has been shown that the wheel dces'nt grind the piece to be formed up to fragmented chips in vacuum, but in ordinary air. The low pressure in the environment of the order 10-5 mmHg should make the top layer of the piece to store rapidely grinding heat and flay it paralell to the ground surface in terms of the thermal shock. In additicin to the air cooling action, physical attacks by water vapour on fracture strength of brittle rieces, also vitrified tools, are discussed.View full abstractDownload PDF (1220K) -
[in Japanese]1969 Volume 35 Issue 410 Pages 195-198
Published: March 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (700K)
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