Journal of the Japan Society of Precision Engineering
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Volume 19, Issue 217
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1953 Volume 19 Issue 217 Pages 131-134
    Published: April 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.131
    JOURNAL FREE ACCESS
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  • On the Measurement of Thermal Diffusivity. (Ist Report)
    New Measuring Method and Some Results
    Harumi Asao, Takafuyu Ochi
    1953 Volume 19 Issue 217 Pages 135-138
    Published: April 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.135
    JOURNAL FREE ACCESS
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    Up to this time, in order to get the value of thermal diffusivity k, we have measured the values of heat conductivity K, density p and specific heat c of materials, and calculated from the equation K/cρ.
    But this method requires much labour and time, so we established a new method to measure them directly. By means of this method we can measure the value of K very esaily and accurately. In this paper we explain this new method and show some results obtained by this method.
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  • The Wear of Copper Alloys
    On the Wear of Brass
    Fusao Hayama, Teruhisa Watanabe
    1953 Volume 19 Issue 217 Pages 139-142
    Published: April 05, 1953
    Released on J-STAGE: February 16, 2010
    DOIhttps://doi.org/10.2493/jjspe1933.19.139
    JOURNAL FREE ACCESS
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    The Research on the wear of copper alloy bearings is, at present, being continued. This is a report on the wear of brass bearings.
    The results obtained were as follows:
    1. The effect of rubbing condition.
    At a comparatively high speed, wear was stable, but as a speed became lower, wear increased gradually and it was maximum at the velocity of 1-2mm/s. As to the rubbing pressure, wear was almost proportional to the pressure.
    2. The effecct of adding elements (Al, Si, Fe, Sn, Pb, etc.)
    By adding Al, Si, Ni, or Fe, brass bore wear-resisting property, but when Sn or Pb was added, wear increased remarkably.
    3. The effect of mechanical property.
    The impact value and the high temperature hardness (500°C) seemed to have relation considerably with wear, but these are still under experimentation.
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  • On the Blank-Diameter of Thread Rolling
    Makoto Masuda
    1953 Volume 19 Issue 217 Pages 143-148
    Published: April 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.143
    JOURNAL FREE ACCESS
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    A formula for blank-diameters of thread rolling is developed here from the calculation of the volume of one thread. The theoretical diameter is affected by the surface roughness of blank and the axial elongation during thread rolling. Such effects are able to be diminished by the blank-finishing and thread rolling method.
    The approximate distribution of the thread dimensions by rolling can be theoretically ditermined by the distribution of the blank-diameter, the thread rolling dies' form and the elastic deformation of the machine.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1953 Volume 19 Issue 217 Pages 149-154
    Published: April 05, 1953
    Released on J-STAGE: February 16, 2010
    DOIhttps://doi.org/10.2493/jjspe1933.19.149
    JOURNAL FREE ACCESS
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  • Theory of Grinding (Part 6)
    A Study of Heat and Temperature in the Process of Grinding
    Kenji Sato
    1953 Volume 19 Issue 217 Pages 154-160
    Published: April 05, 1953
    Released on J-STAGE: February 16, 2010
    DOIhttps://doi.org/10.2493/jjspe1933.19.154
    JOURNAL FREE ACCESS
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    In order to find the heat distribution in grinding, the mean chip temperature is measured by a water calorimetry method, and the work surface temperature by touching an Almel-Chromel thermocouple. Then, the temperature of wheel-work contact surfaces is calculated from the heat quantity conducted into the work through the contact area.
    The results are as follows:-
    1) The heat distribution in the process of grinding is found that about 85% of total energy is conducted to the work, 12% to the wheel, and only 3-5% of heat runs away with the chip.
    2) The heat conducted to the work in the process of grinding increases as the depth of cut increases, and also as the speed of table feed decreases.
    3) In grinding mild.steel by A36L-Vit 7'' wheel, the chip temperature measured is about 300-400°C, in case the wheel surface speed is 1140m/min, the work surface speed 60m/min. the table feed speed 100 mm/min and the depth of cut 0.012mm in radius without any grindiug fluid.
    4) The wheel work interface temperature iucreases in proportion to Δ0.63, where Δ is the depth of grind, and it reach-s easily over 1000°C in normal grinding conditions.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1953 Volume 19 Issue 217 Pages 161-163
    Published: April 05, 1953
    Released on J-STAGE: February 16, 2010
    DOIhttps://doi.org/10.2493/jjspe1933.19.161
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1953 Volume 19 Issue 217 Pages 165-169
    Published: April 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.165
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1953 Volume 19 Issue 217 Pages 170-172
    Published: April 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.170
    JOURNAL FREE ACCESS
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