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1
Content available remote Gas pressure in sand mould poured with cast iron
100%
Chojecki A. , Mocek J.
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2011
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tom Vol. 11, iss. 1
9-14
EN
The results of measurements of gas pressure in foundry moulds made from sands bonded with bentonite, sodium silicate and furan resin were disclosed. It was found that the maximum pressure during pouring of mould with metal occurs in the case of bentonite sands, especially with the addition of coal dust. The effect of this pressure on the formation of surface defects in castings was examined.
2
Content available Kinetics of Gas Emission from Heated Moulding Sands Together with the On-line Assessment of H2 and O2 Fractions - New Investigation Method
100%
Zych J. , Mocek J.
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3
Content available remote Changes of gas pressure in sand mould during cast iron pouring
100%
Mocek J. , Samsonowicz J.
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2011
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tom Vol. 11, iss. 4
87-92
EN
The paper presents a test method developed to measure changes of gas pressure in sand moulds during manufacture of iron castings. The pressure and temperature measurements were taken in the sand mould layers directly adjacent to the metal - mould interface. A test stand was described along with the measurement methodology. The sensors used allowed studying the fast-changing nature of the processes which give rise to the gas-originated casting defects. The study examined the influence of binders, clays and refining additives on the nature of the gas evolution process. The effect of the base sand type - quartz or olivine - on the nature of pressure changes was compared. The test stand design ensured the stability of technological parameters in the examined mould elements, and a repeatable process of making pilot castings. The main outcome was classification of sand mixtures in terms of pressure occurring during pouring of iron castings. The obtained results confirm the usefulness of the described method for testing gas pressure occurrence in a sand mould.
4
Content available remote Evolution of the gas atmosphere during filing the sand moulds with iron alloys
100%
Mocek J. , Chojecki A.
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2009
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tom Vol. 9, iss. 4
135-140
EN
Evolution of atmosphere of the mould cavity when pouring the cast iron has been analyzed. It was find that in dry sand mold the cavity is filled by air throughout the casting time. In green sand the air is removed by the water vapor the hydrogen or carbon oxides formed in contact with the liquid metal. The theoretical results have been confirmed experimentally.
5
Content available remote Gas evolution rate from heated moulding sands bonded with organic binders
80%
Siewiorek A. , Nowak R. , Chojecki A. , Mocek J.
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2011
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tom Vol. 11, iss. 1
87-92
EN
This study is continuation of research on gas evolution rate from heated moulding sands used in the manufacture of foundry moulds. The first stage of the study described in [1] included bentonite-bonded sands. At the second stage, sands bonded with organic binders were tested. The composition of gases, evolved at a given temperature using mould heating system that simulates the process of mould pouring with molten metal, was determined. Metal was not used in these studies to prevent its reaction with gases formed as a result of moulding sand heating, since this effect would significantly impede the gas identification or even make it totally impossible.
6
Content available Gases Emission From Surface Layers of Sand Moulds and Cores Stored Under the Humid Air Conditions
80%
Kaźnica N. , Mocek J. , Zych J.
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7
Content available Kinetics of Gases Emission from Surface Layers of Sand Moulds
80%
Zych J. , Mocek J. , Kaźnica N.
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8
Content available Thermal Conductivity of Moulding Sand with Chemical Binders, Attempts of its Increasing
41%
Jamrozowicz Ł. , Zych J. , Mocek J. , Snopkiewicz T.
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