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 30, Issue 220
Displaying 1-9 of 9 articles from this issue
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  • Reaming on 18-8 Stainless Steel : Concerning the Surface Roughness and the Accuracy
    Minoru NISHIHACHIJO
    1964 Volume 30 Issue 220 Pages 1441-1449
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1441
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    This paper describes the conditions to get good surface roughness and the accuracy of reamed hole on 18-8 stainless steel. As the built-up edge affects much the finish and existence of built-up edge on 18-8 stainless steel was not clear, existence was investigated at low cutting speed before the experiment of reaming, and the built-up edge was recognized at such a low cutting speed on 18-8 stainless steel. So, it is neccessary for good finish to prevent the growth of built-up edge as small as possible at reaming on 18-8 stainless steel. For this purpose sulphurized oil is effective as the cutting fluid. Concerning reaming conditions, proper reamer angles, reamer dimensions, cutting speeds and feed speeds can be obtained.
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  • Study of Shear Spinning : 1st Report, Experimental Investigation
    Masujiro HAYAMA, Tadao MUROTA, Hiroaki KUDO
    1964 Volume 30 Issue 220 Pages 1450-1457
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1450
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    Many researchers have done some work on the analysis of shear spinning process. But they are limited to a certain extent. This paper deals with the experiment of shear spinning process on aluminum to find out the fundamental characteres in detail. The influence of the following working conditions are discussed ; roller position angle (δ), clearance between roller and mandrel (C), feed of roller (ν), cone angle (2α), speed of rotation of mandrel (N), roller corner radius (ρR), roller diameter (DR), blank thickness (t0) and blank diameter (D0). In addition, the deformation theory of simple shear, which is derived from the observation of the experiments, is checked about the tangential force Pθ. It is appointed that there are an optimum blank thickness ts, of which the calculated values agree with the experiments, and if the blank thickness is thinner then ts, the theoretical value is overestimated, but it is under-restimated the other way round.
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  • Study of Shear Spinning : 2nd Report, Theoretical Investigation
    Masujiro HAYAMA, Tadao MUROTA
    1964 Volume 30 Issue 220 Pages 1458-1466
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1458
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    This paper deals with a theoretical study of shear spinning process, which was clarified by the experiments described in the previous report. Assuming that tha deformation of shear spinning is divided into the three parts, which are redundant bending at the start line of contact, shearing and bending on the contact surface between the roller and the blank, the tangential force are evaluated from the total work of deformation in an infinitesimal time interval. The calculated results are checked not noly by the experimental results of the previous report, but the data of Spincraft, Cincinnati, and S.Kobayashi's reports. The state of contact between the roller and the blank are indicated numerically for several working conditions by introducing the contact factor m. In addition, it is indicated that the the axial and radial force components can be estimated apploximately by the optimum angles of frictional components υθ and υψ.
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  • Mechanism of Chip Formation in Machining Plastics
    Akira KOBAYASHI
    1964 Volume 30 Issue 220 Pages 1467-1475
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1467
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    Analysis of chip formation of several kinds of highpolymer has been conducted in order to establish the optimum cutting conditions in view of the background that ever increasing application fields of highpolymers necessitate various types of machining. The mechanical properties of highpolymers vary widely depending upon the types, that is, from rubber-like elasticity to glass-like brittleness, and are also affected by strain rate and temperature. Thus the behavior of chip formation of highpolymers differs from that of metals, namely, the types of chip formation are classified into continuous and discontinuous, moreover the former is subdivided into continuous flow* and shear, the latter into discontinuous simple shear, complex shear and crack. These types of chip depend not only upon the characteristics of the work material but also upon the magnitude and direction of stress or strain during cutting.
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  • On the Machining of the Polygonal Profile
    Susumu KASEI
    1964 Volume 30 Issue 220 Pages 1476-1485
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1476
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    Polygonal profiles used for couplings must be precise in shape. Therefore, the following conditions must be satisfied in the measurement of this kind of profile : a. The rotation angle must be precise in the range 0°∼360° ; b. The radius must be equally correct ; c. The same degree of precision is desirable for the measurement of the shaft and the boss. Taking into consideration of the above conditions, the author adopted the feeler method apparatus on the toolmakers' microscope. In this measurement, the roundness of the measuring edge has an effect upon the accuracy of the profile measurent. In this report, the author studied the theoretical values of error in reading of the lathe-turned profile and the ground profile. And based on the correction formula, the correction chart of profile measurement was prepared for the practical use. According to this chart, the results of the close examination for the experimental polygonal shafts were indicated.
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  • Roughness Tester Using Diaphragm Type Air-Micrometer
    Yasutoshi NAKAYAMA, Hideo ENDO
    1964 Volume 30 Issue 220 Pages 1486-1492
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1486
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    Two types of roughness testers using a "diaphragm type air-micrometer" were made for trial ; one was designed for measuring the roughness of the inner surface of the engine cylinder installed on a vehicle, and the other was so designed as to be able to measure the roughness of both vertical and horizontal surfaces of large size vehicle parts. The mechanism of this tester is as follows : The displacement of the tracer point which scans over the surface to the measured is changed into a pressure indicated by an air-micrometer and this pressure acts on air chambers. A small magnetic needle rotates correspondingly with an action of the air chambers. The torque of the magnetic needle is amplified by means of an air type torque amplifier coupled with the magnetic needle magnetically. Thus roughness is recorded with a recording pen operated by the air type torque amplifier. With the surface profile assumed to be sinusoidal, the characteristics of this tester were discussed. Various tests show that roughness can be accurately recorded by this tester.
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  • Wear Property of the Sulfurizing and the Liquid Nitriding Treatment
    Takashi DAIKOKU, Akio KANESAKI
    1964 Volume 30 Issue 220 Pages 1493-1507
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1493
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    Recently, the sulfurizing treatment and the liquid nitriding process (Tufftride process) have attracted much attention and have been extensively employed in practice. The authors found the most suitable treating condition from the results obtained in the fundamental study on these processes and investigated the effect of these processes on the improvement in wear and seizure properties of cast iron and steels, such as low carbon steel, low alloy steel (Cr-Mo steel) and nitriding steel, using the rotaing wear tester and the automatic seizing-pressure tester. Moreover, this paper presents the some information to obtain a good performance and the appearance of the change of surface roughness by the application of the above-mentioned two processes.
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  • Noise of Camshaft Timing Gears and Characteristics of Raw Material, Phenolic Resin, Influencing on It
    Yoshiro MASUDA
    1964 Volume 30 Issue 220 Pages 1508-1515
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1508
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    The noise of the timing gears treated in this paper is one of rhythmic but objectionable shock noises which are apt to arise at low speed in the 4-cylinder engine after short using. It was shown by calculations and experiments that the torque driving camshaft had fluctuations due to reactive forces of valve springs, and the direction of driving torque turned back cyclically, then tooth-faces of gears struck each other, and it was the cause of this noise. This noise level was mainly related to the amount of backlash of the gears and became to grow distinguishable when the amount was over 0.2 mm. The amount of backlash varies widely owing to the characteristics, especially sensitive contractilities and expansibilities in soaking conditions, of phenol resin as raw material of the camshaft timing gear. The variation has been possible to be minimized by appropriate selection of material and pretreatment which successfully prevented the timing gear from arising this kind of noise.
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  • Noise of Ball Bearing : 5th Report, Generating Mechanism of Noise
    Teruo IGARASHI
    1964 Volume 30 Issue 220 Pages 1516-1524
    Published: December 25, 1964
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.30.1516
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    Although the generating mechanism of the ball bearing noise has been discussed frequently, it has not been made clear till the present time. So, the author analyzed the experimental results on the noise of the ball bearing, made some experiments, and was able to make clear the generating mechanism of the ball bearing noise as follows : - There is a circumferential waviness, of which height is continuously with number of wave-length to the circumference, at the race and the ball surfaces of the ball bearing. Then, as soon as the ball bearing rotates, a minute alternating change in the normal spring, which is due to the elastic contact between the race rings and the ball, occurs. Therefore, a vibrating force imposes on the race rings, they generate their bending natural vibrations ; these vibrations are transmitted to the air, and the ball bearing noise generates.
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