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Volume 39, Issue 463
Displaying 1-13 of 13 articles from this issue
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[in Japanese]1973 Volume 39 Issue 463 Pages 774-780
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1332K) -
Kitao OKUSA, Ryozo KITAGAWA1973 Volume 39 Issue 463 Pages 781-785
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe tool/work thermocouple technique has been used to determine the temperatures reached by metal-cutting tools under various conditions. This method requires an exact calibration curve for the materials used. An earlier report showed that the calibration curve was affected by variations of the carbide mixture, the cobalt content, the size of the carbide tips and the others. However, the influence of the Co binder upon E. M. F. may be more essential than those factors. Because the lattice constant of Co binder is considered to be the main result due to the composition and manufacturing method of tungsten carbide. The various factors upon the E. M. F. output are examined using the specially prepared tungsten carbide tips.
The results obtained are as follows :
(1) The thermoelectric properties of the carbide tools are almost independent upon the variations of the carbide mixture, the cobalt content, and the size of the carbide tips, but strongly dependent upon the lattice constant of binder phase.
(2) The E. M. F. output of the alloys containing TiC is smaller than that of the WC-Co alloys on the same temperature.View full abstractDownload PDF (908K) -
External and Internal Gearings (2nd Report)Yoshikazu HORIUCHI, Kozo KISHI, Kunio YAMADA, Masahiro SESAKI1973 Volume 39 Issue 463 Pages 786-793
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper is intended to present the C. A. D. of general involute spur gears in case of external and internal gearings by "E0-method" using computers and X-Y plotters.
This paper deals with
(1) visualizations of the criterions of the existences of the proposed gears by "Diagram (I), "
(2) tracings of the meshing figures of the desired gears by the aid of "pseudo-gear tooth method, "
(3) checking the avoidance of trochoidal and trimming interferences from the graphs traced by X-Y plotters in case of internal gearings.View full abstractDownload PDF (1055K) -
Residual Stress in Plunge GrindingKenjiro OKAMURA, Toshikatsu NAKAJIMA, Youichi INOUE, Yoshiyuki UNO1973 Volume 39 Issue 463 Pages 794-800
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe cumulation phenomena in grinding lead to the existence of three distinct grinding states, a transient, a steady and a spark-out grinding state.
In this paper, the relation between the cumulation phenomena in grinding and residual stress has first been made clear, analyzing the cumulation process of the residual stress in the transient grinding state and the relief process of the residual stress in the spark-out grinding state.
The residual stress in the steady state has then been analyzed to point it out that the distribution patterns of the residual grinding stress are classified into three types of the distribution, depending upon a fundamental value which determines a geometrical chip shape, and to make clear the factors that affect the depth of stressed layer and the maximum residual stress.View full abstractDownload PDF (1183K) -
Sequencing a Set of Jobs to Minimize Mean Weighted Flow Time with Precedence RestrictionsKenjiro OKAMURA, Hajime YAMASHINA1973 Volume 39 Issue 463 Pages 801-808
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the following problem as a basic type of the scheduling of single stage production. "When one wants to schedule an n/1/F problem with precedence restrictions without setup, what sequence should one make out to complete all of the jobs in the minimum mean weighted flow time without disturbing the precedence restrictions ?"
By developing several useful theorems, it has been made clear that when precedence relations are imposed, it is more essential and important to consider Σ(processing time)/Σ(weighted coefficient) of the jobs related to each other instead of (processing time)/(weighted coefficient) of each job, and that there is still limitation in applying the above value to an arbitrary precedence graph. Instead of establishing more theorems by introducing complicated assumptions requiring time and pains for examining if the assumptions are satisfied, a method has been introduced by which an arbitrary precedence graph is changed into independent precedence relations to which the above value can be applied, and an effective new algorithm to minimize mean weighted flow time with precedence restrictions has been developed.View full abstractDownload PDF (1243K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1973 Volume 39 Issue 463 Pages 809-817
Published: August 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn order to clarify the effects of sulphur and phosphorus contents in steel on the tool life, a joint experiment program was planned and performed under the supervision of the technical committee on machinability in J. S. P. E.
The experimental design methods were used to plan the experiments and the data collected were statistically analyzed for searching optimum tool life models with three independent variables, i.e., the sulphur and phosphorus contents and cutting speed. The following conclusions were obtained from the analyses;
(1) The tool life models accepted by the statistical analysis were T=exp [b0+b2(100 P)]× (100 S)b1 Vb3 for the tool life evaluated by the crater wear and T =exp[b0+b1 (100S) +b2(100P) ]Vb3 as a first order approximation for the tool life evaluated by the flank wear.
(2) The effect of the sulphur content on the tool life varies with the combination of the work material, tool material and the wear adopted as the criterion, while the tool life decreases with the increase in the phosphorus content.
(3) The tool life data showed statistically significant variation by the locations where experiments were made.View full abstractDownload PDF (1711K) -
Eiichi MUTO, Michio NAKANO, Tsuneo IDE1973 Volume 39 Issue 463 Pages 818-824
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes the behaviors of rotational vibrations of gears rotating under such load as the tooth deformation can be ignored. The souces of excitation of vibrations considered here are, 1. the torque variation ΔTf due to tooth friction, 2. the torque variation ΔTε due to the first derivative of transmission errors ε with time, and 3. the torque variation ΔTε due to the second derivative of ε with time. The first and the second torque variations (ΔTf, ΔTε) are obtained experimentally by measuring the torque variations of gears rotating in especially low speed. The third torque variation ΔTε is obtained by differentiate ΔTε with time. In this way, the all terms of excitation of the equation of vibration are determined, and the wave forms of vibrations are obtained by using analog computer. The wave forms obtained by above method are compared with that of experimental results, and it is found that they are closely consistent each other.
The behaviors of the three components of vibration (Δθf, Δθε, Δθε) as the responses of the three excite forces (ΔTf, ΔTε, ΔTε)are as follows; 1. when the meshing frequencies of gears are in the range of lower frequencies than natural frequency of the gear system, the vibration consists mainly of two components Δθf and, ΔTε, 2. when the meshing frequencies are in the range of higher frequencies than natural frequency, the vibration consists of only, ΔTε>.View full abstractDownload PDF (3048K) -
Kunio UEHARA, Fumiyata KIYOSAWA, Hideo TAKESHITA1973 Volume 39 Issue 463 Pages 825-829
Published: August 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA new method for in-process measurement of the flank wear of cutting tools is contrived and examined experimentally. In this method, a fine electric resistor is printed on the clearance surface of the cutting tool which is insulated by thin layer of heat resisting paint. The length of this resistor will decrease with the progress of the flank wear and this decrease is measured as the change of the electric resistance continuously.
The performance of this method would be affected by following factors; (1) materials of the insulator and the resistor, (2) voltage imposed to the resistor and (3) the value of the electric resistance. In this paper, recommended combination of these factors are studied According to the experiment, it is shown that this method of in-process measurement is promising.View full abstractDownload PDF (990K) -
Keiichi HANADA1973 Volume 39 Issue 463 Pages 830-835
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA new wall attachment type pure fluid oscillator was developed by means of inverse feedback loops. These loops are generally called positive feedback loops between right outlet and left control inlet and between left outlet and right control inlet. This inverse feedback oscillator itself is not self-excited, but needs one trigger pulse in order to begin oscillation.
The principle of the oscillation of the inverse feedback oscillators was studied theoretically and experimentally. It was found that their frequencies were about twice as much as that of the conventional feedback oscillator. The pulse width of the inverse feedback oscillations was decided by the phase lag between two cycles, right to left cycle and left to right cycle. If these two cycles are different from each other, the oscillation will soon be stopped as the oscillation continues. However, these two cycles were experimentally found to be the same and the stable oscillation did not stop even when the device was asymmetrical. The reason why these two cycles were the same was studied and the stable conditions for the pulse width were discovered.View full abstractDownload PDF (2113K) -
Akira KYUHSOJIN, Akira TOYAMA, Kouichi KUSAMA, Masahiro KIKUCHI1973 Volume 39 Issue 463 Pages 836-839
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of this paper is to show a new method of accurate measurement of the circular dividing error. In this method, a pair of circular scales are calibrated at a time without any standard, by means of relative measurement of these two scales. First, a pair of circular scales which have the same number of graduations are arranged concentrically, and a series of measurements of the little angles between the corresponding graduations of these scales are made. Then, one of the pair is turned at a certain angle so as to change the relative angular position between two scales properly, and a series of measurements of the little angles between the new corresponding graduations of these scales are made samely. The accuracies of the scales are estimated from two series of measurements. This method is applicable to the measurements of graduation errors of circular scales and other similars. Here, the applications are made to the measurements of facet angle errors of polygon mirrors with the accuracy of the measurement 0.2 seconds of arc, pitch errors of spur gears with the accuracy 1.5 seconds and indexing errors of worm gears with the accuracy 2 seconds transforming the angle to the time, dynamically.View full abstractDownload PDF (7254K) -
[in Japanese]1973 Volume 39 Issue 463 Pages 840-846
Published: August 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (2545K) -
[in Japanese]1973 Volume 39 Issue 463 Pages 847-851
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (872K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1973 Volume 39 Issue 463 Pages 852-856
Published: August 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (6114K)
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