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Water soluble foundry binders with heat hardening
Vaverka, Jiří ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
This thesis is focused on water soluble foundry binders with heat hardening. The thesis comprises general description of moulding mixtures, the description of the most common methods used for heat hardening and primarily the list of current and alternative binders, which reduce negative environmental impact of foundries. Also their qualities, benefits and drawbacks are included.
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Water soluble foundry binders with heat hardening
Dratnal, Lukáš ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
With the increasing foundry requirements we are forced to develop new kinds of foundry binders, either organic or inorganic. There are several requirements for the molding composition and for the proper function. The sand mixture must exhibit appropriate technological, economic and also ecological characteristics. Many environmentally harmful wastes are created from the organic substances contained mainly in binders and catalysts used for molding of the mixture. A good application can be the water-soluble binder cured by heat. These binders allow easy and fast processing and a mixture recoverability.
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Comparison of technological, environmental and economical properties of various binder systems of mould sand mixtures
Ambrož, Ondřej ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
This bachelor thesis is focused on a comparison of technological, environmental and economical properties of various binder systems of mould sand mixtures. The thesis comprises basic overview of the systems used in foundry practice and the individual systems are described properties, advantages, disadvantages and applications. There are mentioned harmful substances which are generated during the preparation of the sand mixture and during casting. Requirements for ecological production castings are a prerequisite for the development of new methods which are environmentally friendly and are also characterized by favorable technological and economic characteristics.
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Water soluble foundry binders with heat dehydratation hardening
Šebesta, Pavel ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
Environmental pressure on foundries has forced manufacturers to develop new organic and inorganic binders. One of the options is water soluble binders that can be hardened by dehydration. In addition to tenacity characteristics and regenerability of the forming mixtures another considered aspect is the amount of emissions generated by casting. Use of these new binders does not require expensive modifications of the machines for work with the forming mixtures.
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Manufacture of centrifugal Castings
Minář, Martin ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
The main goal of this bachelor thesis is to collect basic information related to the production of castings by centrifugal casting. It is focused on horizontal and vertical centrigugal casting, casting of various metals and their alloys, such as zinc, aluminum, iron, steel and silumin. This technology is compared with other casting methods in terms of specific characteristics, amount of usage, production economics, advantages, disadvantages, the resulting quality of castings and other factors.
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Comparison of environmental and technological properties of various methods of manufacture of foundry moulds and cores
Dlouhá, Monika ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
The roots of foundry manufacture perhaps go back to 2000 BC. Since foundry production in its development has undergone four stages and each of them there was a qualitative jump. From 20 century, the chemicals used in foundry moulds and cores which is the cause producing harmful substances that have a negative impact on the environment. Major sources of harmful substances are just binders, hardeners and catalysts that are needed for bonding of moulding mixture. The third stage deals with the foundry physical processes that are not using today, even though they are most ecological. Nowadays the most used methods Cold-box, Warm-box and Hot-box.
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Foundry sands and their properties
Odložil, Jan ; Nezvalová, Hana (referee) ; Rusín, Karel (advisor)
Bachelor thesis describes advantages and disadvantages of base sands used in foundries. The most popular base sands are silicas for their economical and size fraction. They have also much defects as discontinued heat dilatation, acidit reaction and silicosis. Non-silica base sands have not this disadvantages, but they are more expensive. Some foundries have started applying new synthetic non-silica base sands in recent time, which are chemically neutral and the casting quality is high.
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