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13
Content available remote Special non-leaded brasses for permanent mould casting
63%
EN
Purpose: Leaded brasses are most commonly used Cu alloys, especially for home fixture. High toxicity of lead to human caused tendency to eliminate this additions from these alloys. In this work a discussion of solutions to this problem is shown and possibilities of leaded brasses replacement with multi-component non-leaded brasses. Design/methodology/approach: In this work general properties of multi - component brasses are investigated (mechanical, technological and operating properties) as well as its structure and their correlation with chemical composition. Some interactions of additions are shown with physical and mathematical model of its influence on properties. Findings: It was found that in a complex of additions (closed system) the interactions can be described by physical model and mathematical equations showing properties in function of chemical composition can be used to optimize chemical composition for engineering alloys with known properties. Research limitations/implications: However introducing new elements to the system (chemical composition) will disturb the created models (physical and mathematical). It must be said that for investigated alloys optimal properties can be ensured using presented models. Practical implications: Presented approach enables optimization of alloy properties for particular application. Properties can be introduced to the mathematical model which with use of optimization methods will return needed chemical composition. Originality/value: Alloys engineered with use of presented approach have properties close to leaded brass with low increase in total production costs.
EN
In this work authors showed selected results of simulation and experimental studies on temperature distribution during solidification of composite skeleton casting and mould filling process (Fig. 4, 5, 6). The basic subject of the computer simulation was the analysis of ability of metal to fill the channels creating the skeleton shape and prepared in form of a core. Analysis of filling for each consecutive levels of the skeleton casting was conducted for simulation results and real casting. The skeleton casting was manufactured according to proposed technology (Fig. 5). Number of fully filled nodes in simulation was higher than obtained in experimental studies. It was observed in the experiment, that metal during pouring did not flow through the whole channel section, what enabled possibilities of reducing the channel section and pointed out the necessity of local pressure increase.
17
Content available remote Warunki wytwarzania i postać geometryczna odlewów szkieletowych
51%
PL
Przedstawiono dobór geometrii odlewu szkieletowego przeznaczonego do badań modelowych, symulacji zalewania i krzepnięcia oraz własności mechanicznych. Porównano wpływ ciśnienia metalostatycznego stopu aluminium i żeliwa na zapełnianie wnęki formy odlewniczej. Przedstawiono różnice w technologicznych własnościach badanych stopów na wypełnienie wnęki formy. Wykazano wpływ innych czynników poza ciśnieniem na uzyskanie odlewu szkieletowego.
EN
In this work geometry selection for model skeleton casting was shown. This model was used for properties investigation and numerical simulation. Comparison of metalostatic pressure was conducted for Al alloy and cast iron. Influence of technological properties of studied alloys on cavity filling and skeleton casting creation was indicated.
19
Content available remote Method of thermal derivative gradient analysis (TDGA)
51%
EN
In this work a concept of thermal analysis was shown, using for crystallization kinetics description the temperature derivatives after time and direction. Method of thermal derivative gradient analysis (TDGA) is assigned for alloys and metals investigation as well as cast composites in range of solidification. The construction and operation characteristics were presented for the test stand including processing modules and probes together with thermocouples location. Authors presented examples of results interpretation for AlSi11 alloy castings with diversified wall thickness and at different pouring temperature.
20
Content available remote Eliminacja ołowiu z armaturowych stopów miedzi z cynkiem
51%
PL
W artykule przedstawiono stosowane do tej pory metody eliminacji ołowiu ze stopów miedzi. Szczególną uwagę zwrócono na możliwości zastąpienia mosiądzów armaturowych stopami wieloskładnikowymi. Omówiono metodykę prowadzanych badań i ich wyniki. Porównano w-iaściwości nowych stopów z właściwościami klasycznych mosiądzów ołowiowych.
EN
In this work lead elimination methods from fixture brasses were described. Special attention was pointed on possibility of leaded brass replacement with multi-component brass. Studies methodology was shown with some results. The properties of new multi-component alloys were compared with traditional leader brass CuZn39Pb2.
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