Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 6, Issue 12
Displaying 1-6 of 6 articles from this issue
  • [in Japanese]
    1973 Volume 6 Issue 12 Pages 1-10
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Download PDF (1009K)
  • Masamitsu TSUCHIYA
    1973 Volume 6 Issue 12 Pages 11-27
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    This paper presents the method, which improved the efficiency of the electric discharge grinding very much, and results of experiments for recognition of the effects of the method. This method of the electric discharge grinding is performed by the compound grinding effects of the multi-circuit electric discharge and the abrasive grains.
    The experimental results got by using the 30-circuit apparatus and the compound grinding apparatus applied this method are as follows:
    (1) The grinding speed of the 30-circuit electric discharge grinding is 24-27 times in case of RC circuit, and 26-29 times in case of transistor pulse circuit, as large as that of a usual single-circuit system.
    (2) The relation between the total grinding speed (M1) of multicircuit and the number of circuits (n) can be shown by the experimental equation Mn=naM1, where (M1) shows the grinding speed of a singlecircuit and values of constant (a) varies according to the grinding conditions.
    (3) The compound grinding effect enables the roughness of the grinding surface to decrease.
    (4) Compounding the abrasive grains has made it easy to control an automatic feeding of the electric discharge grinding, in addition to which the compressible grinding has made possible without an automatic feeding.
    Download PDF (12047K)
  • On the Repeated Hydrospark Forming
    M. OMORI, T. INOUE, H. TSUCHIYA
    1973 Volume 6 Issue 12 Pages 28-34
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    It is popular to give the energy by a great number of hydrosparks to the specimen in the repeated hydrospark forming like the forming by a great number of intermediate heat treatments in the plastic working. In this paper, the deformation of the specimen formed by one hydrospark of larger energy was compared with it of the specimen formed by the repetition of hydrospark of smaller energy.
    It was found that the specimen was in danger of breaking at the corner when the energy by one hydrospark was relatively larger. It was found that the product formed by the repetition of hydrospark of smaller energy was better than the one formd by one hydrospark of larger energy, and that the former forming method had a effect that decreased the number of intermediate heat treatment.
    Download PDF (2220K)
  • Mamoru KUBOTA, Yuji TAMURA
    1973 Volume 6 Issue 12 Pages 35-42
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Four types of wire-cut electromachining with a reciprocating wire electrode are studied and their machining characteristics are found out experimentally. Owing to the restricted electric current which can be fed in the working area through a fine wire, the higher voltage machining is more rational to feed much working energy. From this point of view the electrodischarge wire cutting is preferred to the other methods which use electrochemical reaction.
    Electrochemical wire cutting does not bring about a good result when the electrolyte flow is slow. Electrolytic wire sawing with free abrasives has a rather good performance and it may be used in the multisawing of hard metals.
    Electrodischarge machining with sodium silicate water solution makes a fine cut and yet a removal rate is lower because of the low working current.
    Download PDF (665K)
  • Machining Characteristics with energy supply forme
    Yoshitsugu MUKOYAMA, Shinpachi NOZAWA
    1973 Volume 6 Issue 12 Pages 43-54
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    As the supply forme of machining energy are varied with the machining circuits, machining characteristics and optimum energy supply forme should be investigated in connexion with defference energy formes.
    The present paper discribed the result of evaporation and molten depth on electrode which are calculated from the thermal conduction in many energy formes.
    The following become clear after these investigations, the energy supply forme that were piled up another forme on the rectangle forme or slope control forme contributes to improving the thermal effect of electrode compared to the rectangle forme.
    Futher to obtain better machining characteristics, it is consider that the condition should be combined to the effect of the impulse force.
    Download PDF (1765K)
  • Kiyohito HASHIGUCHI, Takehisa YAMAMOTO
    1973 Volume 6 Issue 12 Pages 55-67
    Published: March 31, 1973
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    This paper describes an experimental study of the process in energy conversion at the Electrical Discharge Forming (EDF), in which the electrical energy in the transient arc discharge is transformed into mechanical energy which impinges on the work piece. Such process of its phenomena are recognized by using the high speed camera and so-called pin-contactors.
    As the results, this confirmes that the mechanical energy comprisis two forms: The one takes the form of shock wave as well known. The other is the kinetic energy of the sudden flow of the liquid displaced by the expansion-contraction and the translational motion of the bubble produced by the transient arc discharge underliquid. Within the limits of the small-scale experiments, this sudden flow of the liquid plays an important role of impulsive force at the EDF.
    Download PDF (7137K)
feedback
Top