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[in Japanese]
1979 Volume 45 Issue 529 Pages
1-4
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese]
1979 Volume 45 Issue 529 Pages
4-5
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese]
1979 Volume 45 Issue 529 Pages
6-14
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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1979 Volume 45 Issue 529 Pages
14d
Published: 1979
Released on J-STAGE: November 19, 2010
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1979 Volume 45 Issue 529 Pages
14e
Published: 1979
Released on J-STAGE: November 19, 2010
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1979 Volume 45 Issue 529 Pages
14c
Published: 1979
Released on J-STAGE: November 19, 2010
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1979 Volume 45 Issue 529 Pages
14a
Published: 1979
Released on J-STAGE: November 19, 2010
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1979 Volume 45 Issue 529 Pages
14b
Published: 1979
Released on J-STAGE: February 16, 2010
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[in Japanese]
1979 Volume 45 Issue 529 Pages
15-22
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]
1979 Volume 45 Issue 529 Pages
23-33
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]
1979 Volume 45 Issue 529 Pages
34-39
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]
1979 Volume 45 Issue 529 Pages
40-50
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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[in Japanese]
1979 Volume 45 Issue 529 Pages
51-61
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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Studies on Heavy Grinding (3rd Report)
Heiji YASUI, Tetsuo MATSUO
1979 Volume 45 Issue 529 Pages
62-68
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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In the present research, the wear characteristic of grinding wheels in high-depth of cut wet grinding has been investigated by various experiments. In the experiments, the kind of conventional grinding wheels and cutting fluids, and the flux of cutting fluid, were varied. The main conclusions obtained are as follows:
(1) The wheel wear rate is inclined to decrease as the wheel becomes harder.
(2) In the range of theoretical metal removal rate
Zth in which the fracture of cutting edges is mainly related to the wheel wear rate, the wheels of fine grain give lower wheel wear rate than those of coarse grain.
(3) In such a range of
Zth, the large difference in wheel wear rate is not found among the wheels of A grain type employed in this research.
(4) The wheel wear rate when using several cutting fluid types becomes lower in the order of oil, emulsion, soluble, and solution types.
(5) The wheel wear rate is inclined to decrease to some extent as the flux of cutting fluid increases.
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Surface Roughness Generation by the Random Cutting Edges drawn from the Mutually Different Population
Motoyoshi HASEGAWA, Masao KOKUBU
1979 Volume 45 Issue 529 Pages
69-75
Published: January 05, 1979
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This paper deals with the generating mechanism of the ground surface roughness by random cutting edges drawn from the mutually different population. The mutually different population is defined by the grinding geometry. The statistical analyses are derived for the cumulative probability distribution, the probability density function and the root mean square roughness of the ground surface with the effect of the spark out. Good agreement was found between theoretically calculated and experimental results.
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Studies on the Bourdon Tube Pressure Gauge (7th Report)
Hiroshi KONO, Hiroshi FURUKAWA
1979 Volume 45 Issue 529 Pages
76-82
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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In case that we discuss the accuracy of the Bourdon tube pressure gauge, it is supposed that errors of the shape and dimension of the Bourdon tube which arise from manufacturing process, especially the errors of the radius and the thickness, are respectively one of a primary factor which has influence upon the accuracy. But the relation between these errors and the dynamic rigidity of the bender has not been found before. In this paper we regard the bender as a structure which consists of three rollers and the Bourdon tube, and by means of F. E. M. we analyzed how the dynamic rigidity of the roller system would have influence on the errors of the Bourdon tube in the manufacturing process. From the nature of the subject we also considered the Eigenvalue problem and its acceleration technique, especially the Origin Shift Method and estimation of initial values to the number of the Origin Shift, etc.
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Surface Temperature in Process of Oxidation
Suehisa KAWAMURA, Yukihiro IWAO, Shigeo NISHIGUCHI
1979 Volume 45 Issue 529 Pages
83-88
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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The thickness of the metal oxide layer formed on the ground surface is related to the oxidation rate law of the workpiece and the surface temperature in the grinding process. In the present research, the influences of the thermal characteristics of the workpiece and the grinding conditions on the surface temperature of the growing layer after get out of contact with the grinding wheel are studied. The results are as follows.
(1) Theoretical temperature distributions which are calculated by assuming a linear heat source strength with a maximum at the front of the contact zone and zero at the rear, agree with the experimental results.
(2) The relation between the exit, temperature θ
r at the rear end of the contact zone and the maximum temperature θ
m is given by θ
r=0.693θ
m, and the subsequent surface temperature θ
a is expressed as θ
a=θ
r(ντ/ι)
-α, where ι, ν and τ are the semilength of the heat source, the table speed and the lapse of time, respectively.
(3) The value of the cooling coefficient a is about 0.454 and it is almost independent on the thermal characteristics of the workpiece and the grinding conditions.
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Kenichi TANAKA, Hiroshi YANO
1979 Volume 45 Issue 529 Pages
89-94
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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In precision measurements, the major portion of error is frequently identified as personal error. Such personal error is remarkably seen for example in the measurement of indentation by Vickers indentation measuring equipment, in which the diagonal distance of the magnified image of the indentation must be measured by visual detection of the coincidence of the corner of the image with a reference line. It is the purpose of this paper to derive the theory on the primary causes of the personal error in the detection of the coincidence and to confirm this theory by experiments. In this theory, the error is expressed mathematically using two parameters; minimum noticeable threshold and minimum resolving threshold. A simulator is designed and manufactured in order to prove the theory and to study the characteristics of the personal error in the coincidence measurements. The simulator must satisfy the following requirements: the true touch point can be detected independently of the coincidence measurements and operating procedure is the same as that of actual measurement. Through the series of experiments and studies with two typical coincidence methods, we have reached the conclusion that the error in the coincidence method is to be caused by the personal difference in the above-mentioned threshold values.
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Kouji TOYODA, Yoshimasa SAKURAI
1979 Volume 45 Issue 529 Pages
95-99
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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An experimental study for high precision digital angle measurement by using a He-Ne ring laser is described. The triangular ring laser, which is composed of an invar framework with a cavity length of 180 cm and two plasma tubes filled with 14 : 1 : 1 mixture of He : Ne
20 : Ne
22 discharged with current-stabilized power supplies is used. Angles (30°) of twelve sides constituting a polygon are measured applying the principle that the integral of beat signal of the ring laser is directly proportional to the angle of rotation of the ring laser. The dispersion of the measured values is found to be 10"-45" for 30°. It has become clear that it is important to supress fluctuation of cavity length much less than the present level and to operate on stable single mode for better accuracy.
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Dynamic Characteristics of Supporting Mechanism
Mikio AMAYA, Isao KONDOU, Masakatsu HORIE
1979 Volume 45 Issue 529 Pages
100-105
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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This paper deals with a newly developed pin electrodes array supporting mechanism for the high speed electrostatic printer using a dielectric drum. A gap between the dielectric drum and the pin array shoud be maintained 30 μm at a printing speed of 80 cm/s in order to achieve high quality printing. The supporting mechanism has two guiderollers on both sides of the pin array and has two springs which push these rollers to the dielectric drum. The main conclusions are as follows. The resonance frequency of the supporting mechanism which is calculated with the spring constants of the guiderollers and the mass of supporting bed must be designed at much higer frequency than the dielectric drum rotating frequency. Moreover the fluctuation of the driving torque of the dielectric drum must be very small, because this fluctuation induces a secondary critical speed in the drum shaft driving.
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Experiment and Comparison between Experiment and Analysis
Sadakatsu FUCHIZAWA, Hisao TAKEYAMA
1979 Volume 45 Issue 529 Pages
106-111
Published: January 05, 1979
Released on J-STAGE: June 30, 2009
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This paper deals with the experimental study on thin-walled cylinder of finite length subjected to hydrostatic internal pressure and axial load. Annealed aluminium, copper and 70/30 brass tubes are used. The outside diameter of these tubes is 40 mm and the wall thickness is 1 mm. Experimental results such as strain distribution, relation between the internal pressure and the center radius, bursting pressure, critical expanding radius (radius at the center of the cylinder when it bursts), etc. are obtained. These results are compared with the analytical ones by the strain incremental theory (2nd Report) and the logarithmic total strain theory (1 st Report). In general, the experimental results agree with the analytical ones by the strain incremental theory except for the critical expanding radius of short cylinders.
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