Journal of the Japan Society of Precision Engineering
Print ISSN : 0374-3543
Volume 29, Issue 339
Displaying 1-8 of 8 articles from this issue
  • [in Japanese]
    1963 Volume 29 Issue 339 Pages 271-276
    Published: April 05, 1963
    Released on J-STAGE: February 16, 2010
    JOURNAL FREE ACCESS
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  • Analytical Research on Cutting Mechanics of Metals
    Kazuo TANIGUCHI
    1963 Volume 29 Issue 339 Pages 277-288
    Published: April 05, 1963
    Released on J-STAGE: February 16, 2010
    JOURNAL FREE ACCESS
    (1) It is one of the essential ploblems to consider how the shear plane is determined in orthogonal machining.
    In this report the process to determine a shear plane is explained by means of plastic dynamics.
    The shear plane of orthogonal machining is treated as a plain strain problem, and the angle θf between the direction of principal stress and the rake surface of a tool is calculated mathematically from the normal stress and the shear stress on the rake surface of a tool.
    The primary shear angle φ1 is expressed as follows :
    φ1=45°-θf
    (2) On the other hand, Mohr's stress circle and the diagram of a shear plane are shown for the orthogonal machining of lead.
    From Mohr's circle of lead the following relation is obtained experimentally.
    p/k=1.72.0
    p : mean stress-p=1/3(σxyz)
    k : shear yield stress of chip.
    Lee-Shaffer assumes that one of the principal stress in the plastic zone of chip is zero.
    i.e. σx=-p+k=0 ∴p/k=1
    This assumption is not sufficient for the practical cutting process, and is considered as one of the reasons why Lee-Shaffer's formula of a shear angle shows the different value from the experimental shear angle.
    (3) The stress-strain curves of material are seemed to be useful to investigate the relation between the sum of shear strains γt and the total mean value of shear stresses τt which are explained in Report 3.
    Loizou and Sims have performed high speed compression tests for lead by using the cam plastometer under the conditions of various strains, strain rates and temperature.
    From those results the following experimental fomula can be obtained, assuming that the temperature is constant at room temperature.
    σij=3.8·εi0.23·εj0.033
    σij : compression stress for εi and εj (kg/mm2)
    εi : compression strain
    εj : compression strain rate.
    (4) The cutting tests of lead are performed at the room temperature and very slow cutting speed 50mm4, 000mm/min.
    The mean temperature rises so little in those cutting tests that the effect of temperature on the shear yield stress of chip is negligible. According as the increase of rake angles ranging from 20° to 40°, γt decreases but τt increases a little.
    The increase of τt is presumed that the strain rate increases according to the increase of rake angles, and hardend the chip.
    As the results of calculation by the experimental formula of σij, the mean strain rate γt showed the order of 102104 sec-1.
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  • Study on the Electrolytic Process of Nozzling Micro-holes in Metals
    Akira NANNICHI
    1963 Volume 29 Issue 339 Pages 289-296
    Published: April 05, 1963
    Released on J-STAGE: June 30, 2009
    JOURNAL FREE ACCESS
    An electro-nozzle is able to cause a feeding operation through its fundamental mechanism.
    The fundamental mechanism of electro-nozzle given in the previous reports, with the feeding operation, can be endowed with a working ability in making a deep hole and completing an unfinished hole.
    Set forth in this report are the experimental results and the discussions thereon concerning a micro-hole nozzling which has been made with an iron plate to show an example of several procedures to come from this electro nozzle mechanism.
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  • Practical procedure of the measurement of the ball center locus diameter
    Zenzaburo MURASE
    1963 Volume 29 Issue 339 Pages 297-303
    Published: April 05, 1963
    Released on J-STAGE: February 16, 2010
    JOURNAL FREE ACCESS
    In this part 4, a series of approximate equations for correction values on the measurement of the "ball center locus diameter"-the diameter of the imaginary cylinder, on which the center of a ball traces as the ball has screw motion contacting with a screw surface-, the practical measuring procedures and new measuring devices are reported. From the examples of calculations deduced from the exact equations, it is proved that the approximate methods are good enough for practical use.
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  • Keiji OKUSHIMA, Katsundo HITOMI
    1963 Volume 29 Issue 339 Pages 304-309
    Published: April 05, 1963
    Released on J-STAGE: June 30, 2009
    JOURNAL FREE ACCESS
    The cutting mechanism under conditions of progressive flank wear was analyzed theoretically. General expressions for depth of cut and stock removal rate were derived, taking variation of tool forces into consideration.
    Ferritie nodular cast iron was machined with carbide and ceramic cutting tools, and variation of tool forces associated with progress of flank wear was investigated. It was found that tool forces increased with an increase in flank wear in almost linear relationship, and that the rate of increase in feed cutting force was greater than that in principal cutting force.
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  • Boring by Special Cathode
    Toshikazu SATO
    1963 Volume 29 Issue 339 Pages 310-317
    Published: April 05, 1963
    Released on J-STAGE: June 30, 2009
    JOURNAL FREE ACCESS
    The machining methods of boring the work by the electrochemical dissolution are studied experimentally. In these methods the work is taken as an anode and an electrolytic solution flows between the electrodes.
    A carbon steel is used as the work, and the aqueous solution of hydrochloric acid as an electrolytic solution. The cathode is a hollow cylinder, having many holes at its base and its outside is coated with an insulating film.
    The cathode is fed into the work according to the machining speed, and a gap between electrodes is manually controlled in accordance with the voltage between electrodes.
    Although the protrusions are produced on the base of machined surface, these protrusions are reduced with the increase of the ratio of the flow rate of electrolytic solution to the machining current, and machining accuracy also is improved with the increase of these ratios.
    When the feeding speed is smaller than the machining speed, the protrusions vanish, but the machining clearance increases remarkably. The protrusions decrease with the size of holes which are made in the base of the cathode, but the cathode utilizing the metallic filter makes the base of machining surface flatter than the cathode having holes.
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  • [in Japanese]
    1963 Volume 29 Issue 339 Pages 318-328
    Published: April 05, 1963
    Released on J-STAGE: June 30, 2009
    JOURNAL FREE ACCESS
    Download PDF (3877K)
  • 1963 Volume 29 Issue 339 Pages 334-335
    Published: April 05, 1963
    Released on J-STAGE: June 30, 2009
    JOURNAL FREE ACCESS
    Download PDF (417K)
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