Wyniki wyszukiwania - Biblioteka Nauki

1

Reusing of dust collector material as a green sand additive

100%

Bednářová V. , Mikšovský F.

Archiwum Odlewnictwa

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2004

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tom R. 4, nr 13

13--18

EN

Possibilities of reusing materials from dry and wet dust collector systems to the green moulding sand. Results of dusts testing active bentonite, pH, lustrous carbon, sieve analysis, fines, hazardous components i.e. Reusing of dust as a green moulding sand additive – laboratory testing and pilot plant experiences – technological properties of such moulding sand and the quality of produced castings.

PL

W artykule opisano badania dotyczące możliwości wykorzystania pyłów pochodzących z odpylania stanowisk sporządzania mas, wykonywania form i wybijania odlewów. Pyły te w składzie mają bentonit i dodatki substancji zawierających węgiel. Pyły zostały wykorzystane do sporządzania mas z bentonitem. Wykonane, w formach sporządzonych z tych mas, odlewy posiadały dobrą powierzchnię. Próby przeprowadzono dla odlewów żeliwnych o grubości ścianek 10, 20 i 30 mm.

2

Advances in Technology of Soluble Cores for Die Castings

80%

Jelínek P. , Adámková E. , Mikšovský F. , Beňo J.

Archives of Foundry Engineering

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2015

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tom Vol. 15, iss. 2

29--34

EN

A number of technologies is developed that substitute simple metal cores in the high-pressure casting technology. Soluble cores, namely on the salt basis, represent the highest prospect. The contribution gives the results of the production of salt cores by high-pressure squeezing and shooting with using a binder. Special attention is paid to the shape of NaCl salt crystals with additives and the influence on strength properties of cores. A technology of bonding the salt cores is developing. Salinity of circulating water is studied and it is checked with the aid of electrical conductance.

3

Efficiency of additives of the polysaccharide type on physical properties of bentonite mixtures

80%

Beňo J. , Jelínek P. , Špirutová N. , Mikšovský F.

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2011

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tom Vol. 11, iss. 1

5-8

EN

The addition of polysaccharide additives generally aims at improving some important physical properties of bentonite mixtures, above all the stability of moulds against the water loss and prevention of surface defects of castings. Polysaccharide products of inland and foreign production were checked in mixtures of two bentonites of the Czech provenance with the same montmorillonite content. The attention was paid in particular to the abrasion resistance of mixtures during storing them under constant climatic conditions. Conclusions have shown the substantial influence of: the amount of the added additive, the kind and structural composition of the additive (pH of the water extract, electric conductance).

4

Changes in kinetics of hardening the furan-chromite mixtures exposed to extreme temperatures

80%

Mikšovský F. , Jelínek P. , Pluháček J.

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tom Vol. 11, iss. 1s

41-44

EN

In foundries of metallurgical character it is difficult to ensure an acceptable climatic working environment during winter season. It is connected with explosing the raw materials (binders, hardeners) and mixtures to extreme temperatures. The contribution deals with kinetics of harding the furan-chromite mixtures in the temperature range of +20 - -6oC, changes during storing, following fast heating (during drying the moulds), the mixture moisture and the action of water coatings, and also the changes of binding effects of furan binders when storing them under down to - 16oC.

5

Reclamation of Self-Setting Mixtures with Olivine Bound with Alkaline Resols

80%

Jelínek P. , Beňo J. , Duda J. , Mikšovský F.

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6

Reclamation of self-setting mixtures with olivine bound with alkaline resols

80%

Jelínek P. , Duda J. , Mikšovský F. , Beňo J.

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tom Vol. 12, iss. 1

47-52

EN

For the reasons of environmental problems connected with the use of furan binders the attention is increasingly paid to self-setting mixtures with alkali resols. A resol binder stabilized with KOH, NaOH is hardened by liquid esters with the formation of alkaline salts. The increase of their concentration affects the shortening of the mixture bench life, it decreases strength, abrasive wear of moulds and cores is growing, and it results in uneconomical dilution of the reclaim with expensive new base sand. Length of life (bench life) of mixtures plays an important role just in manufacture of huge and voluminous moulds and cores in self-setting mixtures. This contribution aims at analyzing the function of reactive alkaline salts in the reclaim, it monitors consequences of its thermal exposure on properties of self-setting mixtures, and it deals with development of methods evaluating its qualities.

7

Alternative Evaluation of the Properties of the Silica Sands

70%

Beňo J. , Mikšovský F. , Jelinek P. , Konečná K. , Smysl P.

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2014

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tom Vol. 59, iss. 2

735--738

EN

For the evaluation of silica sands, which belongs to the most employed sands of foundry molding mixtures, there are a number of methods and techniques to characterize their quality. This implies good knowledge of their strengths and weaknesses. However, a small proportion of published results are dedicated to the impact of transport on transport routes in the foundry and the processes of dry reclamation on the properties of the silica sands, in particular on changes to the granulometry and the formation of undesirable dust sands shares, which significantly affect the properties of the sand mixture. The aim of this contribution is the evaluation of inclination of the silica sand to crush (the formation of dust, change the granulometry) according to the newly developed methodology with regard to its nature of sand (genesis, the shape of the grains, the character of the surface).

PL

Piaski kwarcowe stanowią podstawowe tworzywo na osnowę mas formierskich i rdzeniowych. Stąd istnieje bardzo wiele metod charakteryzujących ich jakość, co umożliwia poznanie ich zalet i wad. Mało jest jednak prac opisujących wpływ systemów transportowych odlewni oraz systemów suchej regeneracji mas na zmianę ich składu granulometrycznego oraz zawartości frakcji pylastych na właściwości mas. Celem niniejszej pracy jest ocena skłonności piasku kwarcowego do rozkruszania, (tworzenia frakcji pyłowych i zmianie granulometrii) według nowo opracowanej metodyki uwzględniającej charakterystyczne cechy piasku wynikające z jego pochodzenia, kształty ziaren i charakteru powierzchni.