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2 2015

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Zmniejszenie udziału czasów przezbrajania w dostępnym czasie pracy maszyn

Żywicki K., Chabowski P., Dworczak P.

Zarządzanie Przedsiębiorstwem

2015

Vol. 18, nr 3

35--40

The article presents an analysis of three options to reduce the share of changeovers time in the available time of working machines. The first option concerns the reduction of the number and share of changeover times by grouping them in the production schedule by technologically similarity. The similarity is understood as production of products using the same settings of machines or using the same equipment. For the purpose of such approach patterns of clustering and queuing production orders in work schedules machines are formed. This enables the rapid and substantial reduction in the share of changeovers in the available working time of machine without interfering with the retooling process itself. By only knowing the structure of retooling and extract these essential elements, which by pooling and templates queuing can be avoided. In this case, increase the efficiency of the machine is achieved, however, at the same time stocks of both semi-finished and finished products increases and extends the duration of the customer contracts internal or external. The second variant is related to the analysis of the effect of shortening changeover times on the availability of machines. This approach was applied to organizational changes of retooling of machines in accordance with SMED method. This requires the involvement of all people involved in the process and examine depth of the whole process of retooling. At the same time this allows for a significant improvement in the efficiency of the machine without increasing inventory and maximizing production orders. The third analysis includes the simultaneous application of queuing pattern of production orders for individual products in the schedules of the machine and to shorten setup times. This approach allows for rapid improvement of the equipment with relatively low effort and cost.

Mineralogia hałd wietrzeniowych złoża Miedzianka (Góry Świętokrzyskie)

Swęd M., Urbanek P., Krechowicz I., Dworczak P., Wiecka P., Mleczak M., Tobys P.

Przegląd Geologiczny

2015

Vol. 63, nr 6

363--370

The paper presents new data on the weathering zone in Miedzianka, Holy Cross Mountains (Poland), including macroscopic, microscopic and chemical investigation, using scanning electron microscope (SEM) with energy dispersive spectrum (EDS). The deposit contains sulphide mineralization (e.g. chalcopiryte, chalcocite), and carbonates with hydroxyl (malachite and azurite) in the weathering zone. Additionally, arsenic – bearing sulphosalts of the tennantite – tetrahedrite group and Ba-sulphate were found. Moreover, cracks are observed on a macro- and micro-scale, filled with new minerals that formed during the weathering.