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Optimalization of properties of moulding sands in water core of cylinder heads
Hlavsa, Petr ; Malec, Silvestr (referee) ; Rusín, Karel (advisor)
Submitted thesis deals with the change of existing binding system for the Hot–Box method for hardening serving for manufacturing of shell cores the water space of cylinder heads comprise of. Objectives for proposing new binding system for Warm–Box method of hardening under heat are to achieve reduction in creation of condensates and gas substances in binding material compared with existing binding system. Further the thesis is aimed at achieving optimal operating hardness the cores have by reduced batches of binding system and by reduced temperatures of cores in scope reflecting manufacturing conditions in the company Nemak Slovakia s.r.o. While resolving issues there were used methods for evaluating quality of opening materials, core mixtures and cores, further methods for evaluating quality of melt, casts and basic methods for statistical processing of results.
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Accelerate handling strength in 2K PUR adhesives
Slatinská, Jana ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This paper is devoted to accelerating the time to obtain the handling strength of two-component polyurethane adhesive, which was newly purchased by the company Magna Exterios (Bohemia) and had to be tested. In order to speed up the analysis of the problem, methods of IR emitters and temperature chambers were selected to be compared with curing using only the ambient atmosphere. In the second part of this paper, the maximum strength of the bond which withstand the test without damage was measured. The results show that the method of accelerating curing process using an IR emitter is the fastest, but the economic side of things must be taken into account, because it is also the most expensive option of acceleration. The temperature chamber is almost twice as slower, but cheaper. At the end of the thesis, the economic efficiency of the new adhesive line solution is evaluated and how much money can be ideally saved.
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Accelerate handling strength in 2K PUR adhesives
Slatinská, Jana ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This paper is devoted to accelerating the time to obtain the handling strength of two-component polyurethane adhesive, which was newly purchased by the company Magna Exterios (Bohemia) and had to be tested. In order to speed up the analysis of the problem, methods of IR emitters and temperature chambers were selected to be compared with curing using only the ambient atmosphere. In the second part of this paper, the maximum strength of the bond which withstand the test without damage was measured. The results show that the method of accelerating curing process using an IR emitter is the fastest, but the economic side of things must be taken into account, because it is also the most expensive option of acceleration. The temperature chamber is almost twice as slower, but cheaper. At the end of the thesis, the economic efficiency of the new adhesive line solution is evaluated and how much money can be ideally saved.
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|
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Optimalization of properties of moulding sands in water core of cylinder heads
Hlavsa, Petr ; Malec, Silvestr (referee) ; Rusín, Karel (advisor)
Submitted thesis deals with the change of existing binding system for the Hot–Box method for hardening serving for manufacturing of shell cores the water space of cylinder heads comprise of. Objectives for proposing new binding system for Warm–Box method of hardening under heat are to achieve reduction in creation of condensates and gas substances in binding material compared with existing binding system. Further the thesis is aimed at achieving optimal operating hardness the cores have by reduced batches of binding system and by reduced temperatures of cores in scope reflecting manufacturing conditions in the company Nemak Slovakia s.r.o. While resolving issues there were used methods for evaluating quality of opening materials, core mixtures and cores, further methods for evaluating quality of melt, casts and basic methods for statistical processing of results.
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