Core Blowing Process - Assessment of Core Sands Properties and Preliminary Model Testing

Dańko, R.; Dańko, J.; Burbelko, A.; Skrzyński, M.

doi:10.2478/afe-2014-0006

Cited by 6 publications

(7 citation statements)

References 2 publications

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“…Dańko et al [9] studied the core properties prepared from core shooters using a custom method. Of the properties that were studied, the effect of shooting pressure, rate of filling, and the apparent density were the primary focus for different sand grain types.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Quantifying the Effect of the Density of Sand Cores on Their Gas Permeability

Sundaram

Svidró

et al. 2022

JCME

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The density of moulding mixtures used in the foundry industry plays a significant role since it influences the strength, porosity, and permeability of moulds and cores. The latter is routinely tested in foundries using different solutions to control the properties of the moulding materials that are used to make moulds and cores. In this paper, the gas permeability of sand samples was measured using a custom-made setup to obtain the gas permeability in standard units instead of the usual permeability numbers (PN) with calibrated units. The aim of the work was to explore the effect of density variations in moulding materials on their gas permeabilities. Permeability in this work is quantified in SI units, square metres [m2]. The setup works based on Darcy’s law and the numbers obtained from the measurements can be used to deduce the gas permeability, k, of a sample. Two furan resin bonded mixtures with the same grain size distribution were hand-rammed with varying compaction forces to obtain a variation in density. Cylindrical samples (50 × 50 mm) were prepared using a silica sand aggregate sourced from a Swedish lake. The results of the measurement provided the difference in gas permeability between the samples that have varying densities. The results of permeability were then extrapolated by modifying the viscosity value of the air passed through the sample. In order to find the effect of apparent density variation on the pore characteristics of the samples, mercury intrusion porosimetry (MIP) was also performed. The results were in line with the gas permeability measurements.

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Section: Introductionmentioning

confidence: 99%

A Novel Approach to Quantifying the Effect of the Density of Sand Cores on Their Gas Permeability

Sundaram

Svidró

et al. 2022

JCME

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“…This type of device can successfully work in the following technologies: hot-box, warm-box, cold-box and warm-air processes [2,3] or CO 2 [4], in the system of organic and inorganic binders [3,5,6]. The solutions combining the advantages of: a properly designed [1,5,7] shooting and venting system of the device with process modelling [8,9], simulation [1,10], selection and control of parameters of sandmix filling [5,[11][12][13], time of its storage in a core-box [3,5] with inorganic moulding mixtures are particularly interesting.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Stachowicz,

Pałyga,

Kępowicz

2019

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The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the corebox: 200, 250 and 300 °C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO 2 /Na 2 O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending R g U , apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.

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“…Due to the high strength and resistance of the cured moulding sand, this technology is used to produce the most responsible cores, such as cores used for detailed internal engine cooling parts. The shell-forming method for making thin-walled castings is still widely used, especially in the automotive industry [6][7][8]. Although the most popular version is based on organic resins, the inorganic technology developed on the basis on hydrated sodium silicate is gaining interest in companies as well as researchers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Grabarczyk¹,

Major-Gabryś²,

Dobosz³

et al. 2018

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The constantly developing and the broadly understood automation of production processes in foundry industry, creates both new working conditions -better working standards, faster and more accurate production -and new demands for previously used materials as well as opportunities to generate new foundry defects. Those high requirements create the need to develop further the existing elements of the casting production process. This work focuses on mechanical and thermal deformation of moulding sands prepared in hot-box technology. Moulding sands hardened in different time periods were tested immediately after hardening and after cooling. The obtained results showed that hardening time period in the range 30-120 sec does not influence the mechanical deformation of tested moulding sands significantly. Hot distortion tests proved that moulding sands prepared in hot-box technology can be characterized with stable thermal deformation up to the temperature of circa 320 o C.

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Core Blowing Process - Assessment of Core Sands Properties and Preliminary Model Testing

Cited by 6 publications

References 2 publications

A Novel Approach to Quantifying the Effect of the Density of Sand Cores on Their Gas Permeability

A Novel Approach to Quantifying the Effect of the Density of Sand Cores on Their Gas Permeability

Archives of Foundry Engineering

Archives of Foundry Engineering

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