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Volume 33, Issue 385
Displaying 1-11 of 11 articles from this issue
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Deformation Mode, Slip Line Field and HodographEiji USUI, Kazuyuki KIKUCHI, Takeaki KITAGAWA1967 Volume 33 Issue 385 Pages 77-85
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe visioplasticity technique which was presented in a concrete form in the previous paper is applied to the analysis of discontinuous and continuous chip formations.
The plastic deformation at the initial stage of discontinuous chip formation is essentially E.H. Lee's type pseudo-steady plastic flow although the flow does not last so long as to show any practical importance.
Variation of plastic deformation, slip line field and its hodograph with cutting time during a cycle of producing discontinuous chip segment are obtained with the aid of grid lines engraved on a side of the workpiece. The plastic flow, slip line field and its hodograph for continuous chip formation are also obtained using the same technique and compared with the results for discontinuous chip formation. The comparison shows a great resemblance in slip line field and hodograph as well for the both types of chip formation although the grid line deformations are entirely different. This means that instantaneous properties of the each plastic field are es sentially the same, and transition between the two types of chip formation appears to be quite smooth.
Under a very high friction condition on tool-face, built-up edge is sometimes formed from half-way of discontinuous chip formation. The possibility of the formation is discussed with the properties of slip line, and hodograph.View full abstractDownload PDF (9906K) -
On the Cross Hatch Angle and the Grain Depth of CutYukio TANAKA, Nobuo KUMAGAI1967 Volume 33 Issue 385 Pages 86-94
Published: February 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn order to make clear the grinding mechanism of the traversing cylindrical grinding by the cap type grinding wheel and make improvement of the cylindrical grinding operation, we took to the investigation on this grinding method.
In this report, an outline of the traversing cylindrical grinding by the cup wheel is described and the cross hatch angle of the cutting loci by the abrasive grains, the grain depth of cut and the chip length etc. are derived geometrically. Further, the investigation is carried out experimentally.
The results are as follws;
(1) In this finishing method, the grain depth of cut is smaller and the chip length is longer than that under the traversing cylindrical grinding by the straight wheel.
(2) The cross hatch angle of the cutting loci φ increases according to the decrease of the offsetting angle α [α=sin-1 (the offsetting amount/the semidiameter of the wheel)] and the traversing speed, and also to the increase of the surface speed of the work piece, and φ becomes near to 180°-2 α° for the increase of the wheel speed. moreover, the limits of the cross hatch angles become of a wide range and many directional cuttings are carried out, when the wheel diameter is smaller, and the wheel width and α are larger.
(3) In this finishing method, the up grinding and the down grinding are carried out at two contact parts of the grinding wheel, and the cuttings of the various cross hatch angles are carried out by a single grinding wheel.View full abstractDownload PDF (10852K) -
A New Torsional VibrometerGenrokuro NISHIMURA, Yasuo JIMBO, Masaharu TAKANO1967 Volume 33 Issue 385 Pages 95-102
Published: February 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn the last report, the authors found the fact that, solid friction existing in machine parts is diminished by applying the high frequency vibration to them and becomes equivalent to fluid friction.
In this report, the authors produced the long period torsional vibrometer of small size applied by this effect and buoyancy of liquid and observed the following facts;
When the displacement amplitude of high frequency vibration is small, the frictional surface cannot completely slip, and are elastically deformed, and moreover this elastic deformation acts as a spring to shorten the natural period of a pendulum system. This amplitude of high frequency vibration to make the frictional surface completely slip must become large according as the vertical load becomes large. Therefore, from the practical point of view of stability of the vibration system, it is desirable that the vertical load is made as small as possible by adopting a buoyancy method, and the friction due to the residual load is diminished by high frequency vibration.
Applying these effects, the authors obtained a torsional vibrometer with 100g weight pendulum and 13sec. natural period and with the sensibility of 10-4rad/mm.View full abstractDownload PDF (2947K) -
Loading of Grinding Wheels (IV)Hidemi SHIGEMATU1967 Volume 33 Issue 385 Pages 103-110
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSExperimental studies are carried out on the relation between the grinding wheels and the quantities of loading, and on the relation between the work materials and the conditions of loading.
It is concluded that the quantities and conditions of loading on the worked wheel surface change considerably by the kind of abrasive material, grain size, grade and structure of grinding wheel, and work material.View full abstractDownload PDF (6804K) -
On the False BeatsTakesi YANAGISAWA, Kijuro NAKAMURA1967 Volume 33 Issue 385 Pages 111-116
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSUp to the present, it is believed that beats of one string of piano are false beats (defined by W.B.White) caused by inharmonicity. This paper discusses particularly the relationship between false beats and inharmonicity for a certain piano.
It is shown from the experimental results that the beats of one string of a piano consist of false and true beats. The ratio of false to true beats is small, and it is 2/11 in this experiments. The false beats of a string do not exist in the soprano part, and the beats in the soprano part are the true beats. Deformation of a support of string decreases the false beat-rate.View full abstractDownload PDF (7509K) -
Effect of the Dielectric Fluid on the Stock Removal RateTadao TSUTSUI1967 Volume 33 Issue 385 Pages 117-123
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe dielectric fluid is necessary for generating pulse discharges and the machining efficiency depends on the appropriate selection of this fluid. So the stock removal rate of tungsten carbide (work piece) is studied experimentally with various fluids, and the results are as follows.
(1) The stock removal rate increases as the density of the fluid becomes larger, and decreases when the temperature of the fluid increaes.
(2) The removal rate is improved by mixing about 10 per cent of carbon tetrachloride (C Cl4) in transformer oil, but adding ethyl alcohol or toluene is not effective.
(3) Intermittent firing of the fluid in a spark gap does not practically impair the efficiency of machining under various electrical conditions.
(4) Chips produced from both tungsten carbide and cast iron wheel electrode are found in the shape of small spheres in the fluid.View full abstractDownload PDF (4041K) -
[in Japanese]1967 Volume 33 Issue 385 Pages 124-130
Published: February 05, 1967
Released on J-STAGE: February 16, 2010
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[in Japanese]1967 Volume 33 Issue 385 Pages 131-132
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
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[in Japanese]1967 Volume 33 Issue 385 Pages 133
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (214K) -
[in Japanese]1967 Volume 33 Issue 385 Pages 134-138
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (6176K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1967 Volume 33 Issue 385 Pages 139-147
Published: February 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (6518K)
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