Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
Volume 28, Issue 187
Displaying 1-14 of 14 articles from this issue
  • Koyu MIYAZAKI
    1962 Volume 28 Issue 187 Pages 315-322
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    There are two cases for measuring true roundness of a cylindrical work ; the one for the work with two centre-holes on its sides and the other for that without centre-hole. For one of the latter cases, the author previously mentioned both the theory and experimental results of the method based on the chain rule in which he regarded the circumference of the work as a series of straight lines. In that case, measurement was performed with regard to a set of the finite points on the circumference, not performed with regard to other points, and so, if we take other sets of the finite points and superpose true roundness measured from these sets each other, we could expect to obtain more precise results. Thus, he calls this method the superposed chain rule, and in this paper, he gives both theory and experimental results of the method, and examines whether it is to be practically applicable, and makes it clear that the precise test of the true roundness can easily be performed by this method.
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  • Kiyoshi MATSUBARA, Makoto WATANABE
    1962 Volume 28 Issue 187 Pages 322-330
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In this paper, the dose dependence and the load dependence of friction, and also the relation between the coefficient of friction μ and S/P (S : shearing strength ; P : hardness or yield pressure), of linear polymers irradiated by cobalt-60 γ-ray, from 5×107 r up to 2.5×109 r, including non-irradiated specimens, are examined. The μ of crosslinking polymers of polyamide and high density polyethylene increases from two to four times, and that of low density polyethylene decreases gradually to about one half that of the non-irradiated specimen, with increasing radiation dose, and the increase of that of degradated polymers of fluorocarbons is less than above. The dose dependence curve of coefficient α, which is decided by μ∝W, is similar to the reversed curves of those of stiffness, hardness and shearing strength. The μ and S/P are nearly in accord qualitively, but not quantitatively.
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  • Akira ISHII
    1962 Volume 28 Issue 187 Pages 331-338
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    A new method of predicting the shape of the oil film cavity in the diverging region of a short journal bearing with a circumferential oil groove is presented. The first term of the Reynolds' equation was neglected for mathematical simplicity, thus simulating the infinitely short bearing. The pressure distribution, load capacity and attitude angle were also discussed. Some numerical calculations were made to predict the shape of the cavity, and some experimental observations were done to compare with the theory. The transparent bearings were made and the actual cavitation was observed. The experiments showed that there is a good agreement between the theory and the experiment.
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  • Noboru SHINOZAKI
    1962 Volume 28 Issue 187 Pages 339-349
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    Under severe cutting conditions of carbide face-milling operation, cracks first come out almost perpendicularly to the cutting edge on both rake and relief surfaces of blades, and next, cracks parallel to the cutting edge appear according to circumstances. These cracks have negative effects to durability of cutter and especially when cutting fluids are applied, they occur remarkably and the cutter is damaged in an early stage. Situations and circumstances under which cracks occur have three characteristic features. (1) Cracks occur easily when the rate of cooling is better or cutting condition is severe, namely the effect of thermal stress whick depends on temperature difference of cutter surface is large. (2) Occurrence of cracks has size effect. (3) Cracks occur as a saturation curve. It is reported that probability Pv of which cracks occur by one thermal tensile stress σ-T is given by the following equation and the features of crack occurence are explained qualitatively. [numerical formula] 2rm : thickness of carbide tip, Ldsecc : size of chip contact area, σ0 : strength const. of tip, K : const. depending on relative heat transfer coeff, m : material const.
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  • Akira ISHIBASHI
    1962 Volume 28 Issue 187 Pages 350-357
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In operating the gear generating machine with a leading screw and a worm gear, which gives regular rolling motion to the gear blank, the minute errors of the leading screw and the worm in one revolution is called the cyclic error. To what degree the cyclic errors manifested on the profile of generated gear tooth was studied, and the following results were obtained. The effect of cyclic errors on the profile of the generated gear tooth can be divided into two cases ; (a) the irregular motion caused by the cyclic errors appears comparable to the same degree as the profile errors of the generated gear tooth, and (b) the effect appears in a greatly decreased degree on the tooth. The author calculated the degree of the diminutive of the cyclic errors, and obtained graphs of nondimensional equations for general use.
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  • Shusaku OGINO
    1962 Volume 28 Issue 187 Pages 358-361
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    It is somewhat troublesome to handle the intermeshing equation of the involute spiral profile shifted gear. To this, Prof.T.Nakada has constructed an approximate formula by means of approximate geometry, but it has not been hitherto succeeded to evaluate the errors of the approximation. In this paper, the author gives an analytical explanation of Nakada's formula and a more detailed approximate solution of the intermeshing equation. Thus we can evaluate the errors resulted from the Nakada's formula.
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  • Toshiro KASAHARA
    1962 Volume 28 Issue 187 Pages 362-367
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In this report, regarding the eccentric circular cutter which rotates as well as revolves, I theoretically investigated a fundamental equation necessary for the actual working, about which I described in the 2nd and 3rd reports. And the interference due to the periphery of eccentric circular cutter is described. Then, basing upon the fact, I have determined the radius Rc' of the interference limit to be used for the design of this cutter.
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  • Toshiro KASAHARA
    1962 Volume 28 Issue 187 Pages 368-376
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    This report deals with the theoretical study of the shaft and hole fitting, belonging to K-profile, as the first application of the envelope obtained from the eccentric circular motion as mentioned in the first report to the eccentric circular cutter. I determined the necessary condition q=4q' in the case of the 2nd contact fitting, and induced theoretically the necessary condition that brings the relative clearance between the shaft and hole fitting to the minimum in addition to the fact previously mentioned (or based on the previous condition). Then, I found the fact that the shaft and hole by this cutting method show the various good characteristics for a coupling, and it is practically possible to obtain the accurate shaft and hole.
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  • Toshiro KASAHARA
    1962 Volume 28 Issue 187 Pages 377-384
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In this report, I tried to further develop the second report ; in the first place, I theoretically studied the problem of high-order contact fitting, in the second place, I theoretically investingated the new improved cutting method in order to bring the relative clearance between the shaft and the hole to zero as far as possible. Then, it was possible to attain easily the reasonable fitting by the use of the minute eccentric ellipse cutter, which I had proposed (can be obtained by inclining the eccentric circular cutter). In this paper, the improved cutting method is a new trial that can be also applied to the theory of the cutting spur gears with gear-shaper.
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  • Masasuke TUEDA, Yosio HASEGAWA, Yozi ISIDA
    1962 Volume 28 Issue 187 Pages 384-391
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In the present research, we measured the temperature rise in the work accurately by the work-constantan thermocouple method, spot-welding a 0.1 mmφ constantan wire to the work directly. By using this method of temperature measurement, we can record the fine variation of the temperature in the work precisely, and have obtained a result which shows the unequality of the cutting phenomenon on both cutting edges. The effects of the speed and feed of the drill on the temperature rise at a certain point in the work are tested also.
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  • Masasuke TUEDA, Yosio HASEGAWA, Yozi ISIDA
    1962 Volume 28 Issue 187 Pages 392-397
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    In the 1st report, we observed the temperature rise of the work experimentally. In the present report, however, we show the results of the theoretical analysis of the temperature distribution in the work by the use of a numerical method. The results obtained by the analysis show good agreement with the experimental results.
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  • Keiji OKUSHIMA, Katsundo HITOMI, Chukichi NODA, Migiwa MATSUSHITA
    1962 Volume 28 Issue 187 Pages 397-403
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    The mechanism of formation of discontinuous chip in metal cutting was analyzed theoretically with the concept of regional plastic flow in the flow region instead of the conventional concept of single slip along the so-called shear plane. The relationship between formations of continuous and discontinuous chips was reasonably explained. Theoretical expressions for inclination angles of the ending boundary line of the flow region, i.e., fracture surface, the starting boundary line of the flow region, and the shearing strain in the discontinuous chip fragment were deduced and ascertained to be in agreement with the experimental results for carbon steel. Moreover, the shearing stress-strain diagram in metal cutting was discussed and compared with that in static material tests.
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  • Keiji OKUSHIMA, Kazuaki IWATA
    1962 Volume 28 Issue 187 Pages 404-414
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    The machinability of free-cutting leaded steel was investigated from the viewpoint of chip formation. Orthogonal and conventional cutting tests were performed for 7 kinds of leaded steel and 4 kinds of nonleaded steel in order to determine the effect of lead contained in steel. The addition of lead to steel was found effective in improving the machinability and the area of shear region was smaller for leaded steels than for nonleaded steels. The chip classification was proposed for chip treatment in the case of leaded steels.
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  • Keiji OKUSHIMA, Kazuaki IWATA
    1962 Volume 28 Issue 187 Pages 414-419
    Published: March 25, 1962
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
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