Effect of sand dilation on distortions and pattern allowances during steel sand casting

Galles, D.; Beckermann, C.

doi:10.1080/13640461.2017.1290909

Cited by 13 publications

(3 citation statements)

References 16 publications

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“…These models can reduce calculation in stress field simulation, but results in large accuracy loss in prediction deformation in investment casting [4]. Galles and Beckermann [15] investigated the impact of shell on pattern allowance in sand casting, identify the importance of dilation and gives a quantified model. Yan et al [16] took the deformation of shell into consideration with FDM simulation, resulting in agreement with practical cases in slot-board material.…”

Section: Introductionmentioning

confidence: 99%

Semi-solid plasticity and deformation control of superalloy investment casting

Ding

Wang²,

Guan³

et al. 2023

Preprint

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The deformation in superalloy investment casting under thermal-mechanical coupled stress is causing huge waste of materials and energy. Mechanical models of both alloy and shell are essential to predict the deformation of castings accurately. The elastoplastic behavior of superalloy in semi-solid zone is critical to the deformation during solidification. In this paper, the deformation of ring-to-ring castings with Ni-based superalloy K4169 is researched. To obtain the thermal-mechanical behavior of K4169 from solid region to semi-solid zone, physical simulated uniaxial compression is performed. Yield stress and plastic modulus from the measurement are imported into the database for numerical simulation. Different thermal-mechanical models of both alloy and shell are compared. With elastoplastic model for alloy, considering the deformability of shell with elastic model, the accuracy of prediction is within CT4 level, with a maximum error of 0.39mm. The deformation of reaches the minimum when the initial temperature of alloy and shell are 1500℃ and 900℃. The research on semi-solid performance of alloy and thermal-mechanical models can provide theoretical guidance for deformation prediction. The method of this research is promising in dimensional control of castings, and can be transported to dimensional control problems upon solidification process with different kinds of materials and castings.

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Section: Introductionmentioning

confidence: 99%

Semi-solid plasticity and deformation control of superalloy investment casting

Ding

Wang²,

Guan³

et al. 2023

Preprint

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“…The transition processes are accompanied by thermal expansion because at higher temperatures more open crystal structures are favoured. Expansion properties of different types of foundry sands and the effect of various additives and bonding agents on the thermal expansion of moulds and cores are common topics of foundry research [3][4][5][6][7][8][9][10][11]. Some reports also mention the partial investigation of specific size ranges of silica sands.…”

Section: Introductionmentioning

confidence: 99%

The origin of thermal expansion differences in various size fractions of silica sand

Svidró

Diószegi

Svidró

2020

International Journal of Cast Metals Research

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In this study, thermophysical properties of a commonly used silica sand were investigated and their relation to its granulometric and chemical composition was studied. Thermal expansion and differential scanning calorimetry tests were performed on individual fractions of the silica sand together with X-ray fluorescence measurements to determine their constituents. It was found that the various size fractions of silica sand exhibit different levels of thermal expansion based on the differences in SiO 2 content. The expansion behaviour of two additional silica samples and a recycled olivine sand was also investigated in relation to its grain size to justify the findings.

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“…The effects of carbon on the solidification of nodular cast iron are significant for environmental conservation and if properly controlled the emissions of poisonous gases can be reduced [1]2017.The Dust and fumes pollutes the environment and sand dilation on distortions and pattern allowances have a considerable effect on these emissions [2]2017.The beehive matrices analysis and ant biodiversity were employed to study heavy metal pollution impact on environment of foundry using Spinola 1806 as bio indicator [3]. Graphite expansion during eutectic solidification of cast iron plays an important role for emissions of carbon dioxide during casting solidifications.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

IJET

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The large amount of flue gases produced by cast iron foundries using Coke fired cupolas for melting, contains injurious elements like SO 2, CO 2, CO, H 2 S, NOx, SPM etc. which damages the environment and are dangerous to all living beings. The emissions of SO 2, CO 2, CO , H 2 S , suspended particles, dust and grit have not been found within the pollution control limit as set down by central pollution control board of India. Therefore all the foundries in Taj Trapezium Zone (TTZ) have been ordered to be closed down by a recent order of the Honourable Supreme Court of India. It is not only the problem of India but is a global one. As per instructions of Hon'ble Supreme Court of India the cleaner technology should be used instead of cupola furnace. The author conducted a series of experimental investigations on the rotary furnace, installed at industries at Agra. These experimental investigations on the rotary furnace revealed that by reducing rpm from 2 to 1 not only the fuel consumption and emission levels were drastically reduced but its performance was also significantly improved

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Effect of sand dilation on distortions and pattern allowances during steel sand casting

Cited by 13 publications

References 16 publications

Semi-solid plasticity and deformation control of superalloy investment casting

Semi-solid plasticity and deformation control of superalloy investment casting

The origin of thermal expansion differences in various size fractions of silica sand

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