The effect of gas permeability on the pressure of artificial resin-bonded core gases

Mádi, L; Varga, László

doi:10.1088/1757-899x/426/1/012033

Cited by 3 publications

(6 citation statements)

References 1 publication

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“…Figure 5. The effect of resin quality on the pressure of the released gases [11] The measurements prove that the gas pressure curves are strongly influenced by the resin quality. The first pressure peak can be observed less than 10 s after casting, in case of 720 °C casting temperature.…”

Section: Resultsmentioning

confidence: 89%

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The Pressure Characteristics of the Released Gases from Sand Cores

Mádi,

Budavári,

Varga

2020

IJEMS

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The core packages used for the production of castings are generally made from cores of different quality (no- bake phenol, HB-phenol, and HB-furan) and resin quantity, to meet the various requirements for the casting. In our research, the effect of the amount of resin on the pressure of the gases evolved from the cores was investigated. Experiments have shown that increasing the amount of resin has a different effect on different binder systems.

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Section: Resultsmentioning

confidence: 89%

“…The first pressure peak can be observed less than 10 s after casting, in case of 720 °C casting temperature. The pressure peaks vary between 4-14 mbar in case of the different resin qualities [11].…”

Section: Resultsmentioning

confidence: 99%

The Pressure Characteristics of the Released Gases from Sand Cores

Mádi,

Budavári,

Varga

2020

IJEMS

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“…The average grain size for the samples was calculated according to the Swedish standard and is presented in Table 2. The permeability of these samples was studied using a custom-made measurement system prepared at the School of Engineering of Jonkoping University [11]. The experimental setup is shown in Figure 3.…”

Section: Methodsmentioning

confidence: 99%

“…The permeability of these samples was studied using a custom-made measurement system prepared at the School of Engineering of Jonkoping University [ 11 ]. The experimental setup is shown in Figure 3 .…”

Section: Methodsmentioning

confidence: 99%

“…In foundry technology, several authors have aimed to study the grain size distribution and its effect on permeability. Madi et al [ 11 ] determined the grain size distributions of two commercially available silica sand. They studied the effect of varying resin quality on the evolution of gases from the sand cores at different casting temperatures.…”

Section: Introductionmentioning

confidence: 99%

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On the Relation between the Gas-Permeability and the Pore Characteristics of Furan Sand

Sundaram

Svidró

et al. 2021

Materials

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Furan sand is one of the most commonly used chemically bonded molding materials in foundries across the world. It consists of a furfuryl alcohol-based resin and an acid-based liquid catalyst. When the molding material comes in contact with the molten metal, it undergoes a thermal shock accompanied by a certain release of volatile gases. In order to evacuate these gases, molds and cores should have optimal gas permeability values and proper venting by design. If the volatile compounds are not appropriately evacuated, they are prone to enter the melt before the first layer of solidified metal is formed which can lead to the formation of gas-related casting defects. Standard gas permeability measurements are commercially available tools used in the industry to compare and to quality control different sands, however, they only provide reference numbers without actual units. Permeability in a standard unit, m2, provides uniformity and helps the comparison of results from difference sources. In this paper, a new method using Darcy’s law (prevalent in earth sciences), was adapted to measure the gas-permeability of furan samples made of silica sand with various grain size distributions. The effect of grain size distribution on the gas-permeability of furan sand samples was studied. Gas-permeability values in m2 were then correlated with mercury-porosity measurement results to bring new light on the relation between pore size, pore volume and the permeability of molding materials.

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The effect of sand quality on the bending strength and thermal distortion of chemically bonded sand cores

Gyarmati

Budavári

Fegyverneki

et al. 2021

Heliyon

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The quality of chemically bonded sand cores used during the manufacturing process of cast components is highly dependent on the properties of the sand, which constitutes the refractory base media of the core. One of the main advantages of the application of different types of sands as molding aggregates that after casting, they can be reclaimed and can be used again during core shooting. The properties of the sand, however, could be remarkably changed during the casting and reclamation processes. This study aims to investigate the effects of the properties of the base sand on the mechanical strength and thermal distortion properties of samples made from new and thermally reclaimed silica sand. For this purpose, particle size analysis, specific surface area, and loss on ignition measurements, as well as differential thermal analysis coupled with thermogravimetry, were executed on the base sands, and the sand grains were analyzed with scanning electron microscopy and X-ray diffraction. Test pieces were made with hot box and cold box technology for bending and hot distortion tests. It was found that by the utilization of reclaimed sand, cores with higher average bending strength and lower thermal deformation can be produced. These differences can be traced back to the more advantageous granulometric properties, lower impurity content, and lower thermal expansion of thermally reclaimed sand.

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The effect of gas permeability on the pressure of artificial resin-bonded core gases

Cited by 3 publications

References 1 publication

The Pressure Characteristics of the Released Gases from Sand Cores

The Pressure Characteristics of the Released Gases from Sand Cores

On the Relation between the Gas-Permeability and the Pore Characteristics of Furan Sand

The effect of sand quality on the bending strength and thermal distortion of chemically bonded sand cores

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