Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
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Volume 25, Issue 158
Displaying 1-11 of 11 articles from this issue
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  • Recent Trends in Welding
    Hiroshi MIKAMI
    1959 Volume 25 Issue 158 Pages 961-962
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.961
    JOURNAL FREE ACCESS
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  • The Vibration Tool Caused by the Formation of the Discontinuous Chip
    Shizuo DOI, Hazime MORI
    1959 Volume 25 Issue 158 Pages 963-971
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.963
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    In β brass-cutting operation the chip is formed by the shear fracture, which occurs intermittently and the vibration of cutting edge frequently occurs. The motions of the cutting edge and workpiece were measured simultaneously by the optical method. The amplitude of vibration increases and the frequency decreases as the thickness of chip increases. The frequency increases proportionally to the increase of cutting speed. The shape of segmental chip shows nearly the similar figure, even if the thickness of chip is changed. When the cutting angle 90° is used the amplitude of vibration is smaller than the case in which the cutting angle 70° is employed. The cause and the character of this forced vibration completely differ from that of chatter which is self-excited. The vibration is effectively prevented by the decrease in the tool length.
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  • On the Behaviour of Chip at Steel Cutting : Part 2, In the Case of Parallel Type Chip Breaker
    keiji OKUSHIMA, Tetsutaro HOSHI, TAkashi FUJINAWA
    1959 Volume 25 Issue 158 Pages 972-978
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.972
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    This paper describes the behaviour of chip at steel cutting by lathe tools with parallel-type chip breakers, which is a most fundamental type of chip breakers. The first half describes the curling radius of chip bent by chip breakers. We introduce here our new equation about the curling radius. The latter half describes the chip breaking action of chip breakers. Using the above equation of curling radius, we succeeded in an equational representation of the conditions, in which chip is properly broken. On the basis of this equational representation, a monograph was drawn up for the design of chip breakers.
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  • The Effect of the Relative Displacement between the Grinding Wheel and the Work on the Wheel Depth of Cut in Grinding Operation
    Susumu SHIOZAKI
    1959 Volume 25 Issue 158 Pages 979-987
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.979
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    The displacement of the relative position of the grinding wheel and the work at grinding operation is investigated. The true and the equivalent wheel depth of cut, the decrease of work radius, and the cutting residue are computed under the following assumptions. (1) The effect of the vibration is ignored. (2) The relative displacement between the grinding wheel and the work is elastic and proportional to grinding force. (3) The parallel movement of the work and the grinding wheel caused by the grinding force is assumed, respectively. (4) The wear of the grinding wheel is ignored. The analysis shows that the equivalent wheel depth of cut is equal to the amount of the wheel-head advance at each pass when the number of passes is increased.
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  • Crater Wear of Carbide Cutting Tools
    Toshio SATA
    1959 Volume 25 Issue 158 Pages 988-995
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.988
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    A fundamental relation for crater wear of carbide cutting tools is proposed by considering the mechanism of metal wear and the speciality in the friction process on the tool face. Tool-life tests of carbide cutting tools in machining of Cr-Mo steel are carried out by varying the tool feed, cutting speed and rake angle of cutting tools in wide range, and cutting temperature is estimated in each case. These results ascertain the validity of fundamental relation for crater wear proposed, meaning that depth of crater wear is in proportion to the specific wear of tool material, shear stress on the rake face and rubbing distance by chips, and that the specific wear of tool material depends only on the tool-face temperature. Lastly, the methods of improvement in tool-life for crater wear are discussed in the light of these results obtained.
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  • On Fretting Corrosion : Part 1, Nature of Fretting Corrosion
    Norimune SODA, Akira AOKI
    1959 Volume 25 Issue 158 Pages 995-1004
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.995
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    A special wear testing apparatus is designed in which the slider with spherical surface reciprocates axially on the surface of rotating cylinder. Amplitude of the reciprocation of slider can be varied from 0.5 to 2.0 mm, and its frequency from 100 to 2400 cpm. The cylinder can be rotated at a low speed of 0.003 rpm. The cylinder surface can be heated up to 150°C by electric heater under the surface. Effects of load, velocity, amplitude, frequency, temperature, humidity and other factors on the volume of the wear are studied, and the relation [numerical formula] is obtained experimentally, where L is the volume of the worn away material and W the load.
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  • On Fretting Corrosion : Part 2, Analysis of the Mechanism of Wear
    Norimune SODA, Akira AOKI
    1959 Volume 25 Issue 158 Pages 1005-1010
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1005
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    An analysis of the mechanism of wear is given and a general formula for the relation between the volume of the worn away material and the load is obtained. In this analysis the number of contacts of small protuberances in the surface is assumed to be xm/h, where x is the depth of deformation of the surface, h the mean distance between protuberances and m a constant. The general formula obtained is as follows : [numerical formula] where L' is the volume of the worn away material per unit length, W2 the load and y, m, p constants. This formula coincides well with the experimental relation L∝W0.7 which is mentioned in the first report. Discussions are given on the process of developing the oxide dust between the surfaces.
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  • Theory of Grease Lubrication of Cylindrical Roller Bearing
    Tokio SASAKI, Haruo MORI, Norio OKINO
    1959 Volume 25 Issue 158 Pages 1011-1018
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1011
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    The lubrication theory on the substances of rheological behaviour as grease is a recent theme. In particular, as the grease is often used for the lubrication of rolling bearing, it is important to establish a theory of grease lubrication for rolling bearings. In this paper, considering the grease as a Bingham plastic, a theory of grease lubrication for cylindrical roller bearing has been deduced. That is, the special core formation in grease film, the frictional resistance of rolling bearing, the pressure distribution and the load capacity of grease film entrapped between roller and race of cylindrical roller bearing have been researched. In addition, the above grease lubrication theory is compared with the oil lubrication theory.
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  • Rotating Characteristics of the Needle Bearing
    Tokio SASAKI, Tetuzi NOTO, Seigi ITO
    1959 Volume 25 Issue 158 Pages 1018-1026
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1018
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    Skewing of needle rollers and it's influences on rotating characteristics of the needle bearing are investigated theoretically and experimentally, and the results obtained are summarized as follows. (1) There are two states of skew angle θ. For θ<θ1, rollers can rotate normally, and θ of each roller is not allways constant. When θ exceeds θ1, θ increases rapidly up to θ2, and the pressure between rollers and friction moment increases extreamely. As the inner-race contacts nearer the roller-end, θ becomes to this state more easily. (2) Circumferential clearance C.C. and diametrical clearance D.C. have not any direct relations to θ for θ<θ1. But, to extend operating condition free from extreme temperature rise and failure of the bearing, it is profitable to make C.C. small and θD.C.max larger than θC.C.max. Where, θD.C.max and θC.C.max are max. skew angles calculated for D.C. and C.C. respectively. (3) It is presumed that rollers having long effective length and large end diameter are profitable. (4) The thrust force is induced by skewing of rollers and linearly proportional to the bearing load.
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  • Noise of Ball Bearing : 1st Report, Case of Simple Ball Bearing
    Teruo IGARASHI
    1959 Volume 25 Issue 158 Pages 1027-1034
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1027
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    There are many researches on the noise of the ball bearing, and their conclusions about noise source can be divided into two main opinions ; one is due to the elastic vibrations of the outer ring, the other is the vibrations of the cage or ball. However, these conclusions are only based on a hypotheses. So, first, the auther measured the noise of three kinds of the simple single raw deep groove ball bearings, analyzed about the peak value of the frequency spectrum, and obtained the results as follows : - 1) The noise of a simple ball bearing is due to the vibrations of the outer ring. 2) In the above vibrations, there are radial and axial bending ones, and they have the first and second modes respectively. 3) On the axial load, another vibration exists and its vibratory system which was found by Mr. Tanaka, consists of the mass of the outer ring and the stiffness of the ball bearing for axial direction.
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  • A Dynamic Theory of Piston-Ring Lubrication : 2nd Report, Experiment
    Shoichi FURUHAMA
    1959 Volume 25 Issue 158 Pages 1034-1043
    Published: October 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1034
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    An experimental study was made on the dynamic theory of piston-ring lubrication, which was introduced in the 1st. report. The apparatus used in this investigation had a stationary piston and a moving cylinder, the speed of which could be accelerated to 2000 rpm, and a constant or varied load was applied to the piston-ring by means of a rubber tire, which was pushed out by the compressed fluid. When the speed, load, temperature, and the phase of the varied load being changed, a frictional force of the piston-ring is measured by an electronic device which consisted of an elastic diaphragm, movable anode tube and oscillograph. These experimental results gave a good agreement both qualitatively and quantitatively with the theoretical value.
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