Computer Aided Manufacturing System for Sheet Metal Parts

  • Masatsugu Okada


This paper describes a computer aided manufacturing system developed practically for small size variously shaped sheet metal parts. The system mainly consists of hardware, such as the central computer, the data stations, the modems which connect between them, NC machines and their controllers, with software which was specially built for this system.

Sheet metal parts, mainly used as structural parts in electrical communications equipment, have been produced by skilled personnel in the following sequence. First, the necessary number of various shaped blanks are cut from the material sheet. Second, holes are punched in each blank as required. It would be very difficult to use an automatic system in these operation, because of the multikind, small quantity production. However, an automatic system was realized in this CAM system by inverting the operation sequence. First, holes are punched in each part whose template has already been arranged on standard size material sheet with many other differing parts. Next, the parts are cut one by one from the sheet.

Process Planning, from parts template arrangement on the material stock, to cutting after punching holes, is all processed by the central computer to minimize material waste, number of tool changes and total tool movement path length, without interruption by a human operation.

In addition, computerization, in which a designer can make free use of his creativity and the easily input operation of his design information by use of the data station, unless it disturbs or troubles production, should be closely considered for this system.

Using the newly developed system brings about a 60 % reduction in machining manhours and a 30 % savings in materials.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    N. Kurochi, M. Shimozono, M. Okada, M. Takahashi and N. Okino, (Z) Computer-Aided Design and Manufacturing System for Sheet Metal Structural Parts, Proc. 3rd Int. Conf. Production Eng., p. 29.Google Scholar
  2. [2]
    M. Shimozono, M. Okada, H. Kobayashi and K. Tanabe, (1978) Computer Aided Manufacturing System for Sheet Metal Parts, NEC R&D, 49, p. 76.Google Scholar
  3. [3]
    N. Kurochi, M. Shimozono, M. Okada, T. Watanabe and N. Okino, (1979) CAD/CAM System for Sheet Metal Structural Parts (Development and Implementation), Bull. Japan Soc. Prec. Eng., 13, 3, p. 111.Google Scholar
  4. [4]
    Y. Kakazu, M. Furukawa and N. Okino, (1976) The Optimum Trimming of Rectangular Plates, Bull. Japan Soc. Prec. Eng., 9, 5, p. 127.Google Scholar
  5. [5]
    K. Iwata, (1976) Present Status and Problems of CAD/CAM System in Manufacturing, Journal of the J.S.M.E, 79, 692, p. 618.Google Scholar
  6. [6]
    R.C. Swanson, (1979) Computer Programs for Mounting-piate Manufacture, The Western Electric Engineer, 23, 1, p. 33.Google Scholar
  7. [7]
    Oil. B.G. Madsen and Bendt G. Christensen, (1976) On Optimal Cutting Problems, IX Int. Symposium Math. Programming, Budapest, Hangary.Google Scholar
  8. [8]
    M. Krejcrik, (1969) Computer-Aided Plant Layout, Comput. Aided Des., 2, 1, p. 7.CrossRefGoogle Scholar

Copyright information

© The Department of Mechanical Engineering, University College of Swansea 1981

Authors and Affiliations

  • Masatsugu Okada
    • 1
  1. 1.Transmission DivisionNippon Electric Co. LtdJapan

Personalised recommendations