Tula State University (Tula, Russia):

V. B. Protasyev, Dr. Eng., Prof., e-mail: avprotasev@mail.ru

Plekhanov Russian University of Economics (Moscow, Russia):

S. V. Yudin, Dr. Eng., Prof., e-mail: svjudin@rambler.ru

It is shown that the existing methods for assessing the labourintensity of manufacturing engineering products, in particular tools designed for machining steels and alloys, are not optimal in small-scale and piece production. Based on personal experience and analysis of literature data, the authors propose to use the “signal-to-noise” criterion and loss function introduced for this purpose into scientific phrase by G. Taguchi, the Japanese quality assessment specialist. For this purpose, single-type tools or any other products are isolated and the main structural elements are revealed in them. Using the methods of qualimetry and based on an expert survey, the weight of each element is determined. A base product containing all structural elements is selected, the labor-intensiveness of which is known. Relative scores of each structural element of the manufactured product are calculated. The relative labour-intensity indicator is calculated taking into account the weights of all structural elements as the average value of the relative scores. To assess the absolute labour-intensity, the G. Taguti`s parabolic loss function is used. The authors affirm that the labour-intensity of manufacturing products can be considered as losses. A technique to determine the parabola parameter is presented. An example of calculations to determine the labour-intensity of manufacturing a spherical conic mill is considered. This example shows that the proposed method does not require specific knowledge and skills, can be easily automated. The technique can be extended to any product, including rolled products in metallurgy. A corresponding example is considered.

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