Impact of Silica Sand Granulometry on Bending Strength of Cores Produced by ASK Inotec Process

Conev, M.; Vasková, Iveta; Hrubovčáková, Martina; Hajdúch, Peter

doi:10.21062/ujep/x.2016/a/1213-2489/mt/16/2/327

Cited by 3 publications

(6 citation statements)

References 2 publications

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“…Maximum strength is reached at a 60:40 mix, but high strength is also reached at 70:30, 40:60, and 30:70 ratios. This was already explained by examining the grain size distribution in the work of [9].…”

Section: Bending Strengthmentioning

confidence: 86%

“…According to the author´s previous research work [9], combining fine and coarse silica sands in specific ratios results in an increase of compaction and strength. Within this work, a wider choice of sands and properties were examined.…”

Section: Sieve Analysismentioning

confidence: 95%

“…For all mixtures, the amount of liquid binder was 2.0 wt.% and the amount of powder additive was 0.9 wt.%. Preparation of the mixture was done accordingly: Samples for measurement of bending strength (170 mm × 22.5 mm × 22.5 mm) were produced using the Benetlab laboratory core blower (Benetlab s.r.l., Passirano, Italy) ( Figure 3) according to blowing and curing parameters published in the work of [9]. The measurement of bending strength is done as a basic characteristic property for molding materials; it depends on the binder system used and its dosage, as well as on the base material used and its properties (chemical, mineralogical, grain shape, grain size).…”

Section: Bending Strengthmentioning

confidence: 99%

“…AFS grain fineness number is a measure of average grain size and represents the number of openings per inch of a sieve that would pass the average size calculated from the sieve analysis. MK represents calculated average grain size from sieve analysis [9]. In order to cover a wide variety of sand properties, four different fine sands with a comparable grain size distribution, but with different properties such as grain shape, average grain size, and chemical and mineralogical composition were selected.…”

Section: Introductionmentioning

confidence: 99%

“…Dry mixing of sands for 60 s; • Dry mixing of sands with powder additive for 60 s; • Mixing with liquid part of binder for 60 s; • Storage of prepared mixture in closeable container in order to prevent drying during samples production.Samples for measurement of bending strength (170 mm × 22.5 mm × 22.5 mm) were produced using the Benetlab laboratory core blower (Benetlab s.r.l., Passirano, Italy) (Figure 3) according to blowing and curing parameters published in the work of[9].…”

mentioning

confidence: 99%

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Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Vasková

Varga

Prass³

et al. 2020

Metals

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The automotive industry is one of the most important customers for the foundry industry. In particular, casting of engine parts for combustion engines is one of the most demanding areas of casting technology. New generation of engine blocks and cylinder heads are getting geometrically more complicated in order to maintain or even increase performance. With the increased complexity, the strain for the casting molds is growing and the widely used technology of core making with standard silica sands is, for several applications, no longer reaching the demanded results. Furthermore, in last decade, there has been an effort in using inorganic binders in core making process, which brings along some additional technological challenges. In order to cope with these challenges, in this paper, silica and non-silica sands with round and angular grains as well as with fine and coarse grains are examined using an inorganic binder for strength, permeability, and thermal stability. The results shall provide useful information about the possibilities of application and combining different types of foundry sands, both silica and non-silica. With their impact on the selected sand core properties, they can help in solving problems in the core making process as well as reaching a high quality of the final product-casting.

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Section: Bending Strengthmentioning

confidence: 86%

Section: Sieve Analysismentioning

confidence: 95%

Section: Bending Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Vasková

Varga

Prass³

et al. 2020

Metals

Self Cite

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Influence the Composition of the Core Mixture to the Occurrence of Veining on Castings of Cores Produced by Cold-Box-Amine Technology

Hrubovčáková¹,

Vasková²,

Conev³

et al. 2017

Manufacturing Technology

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Method of cold-box-amine is widespread and frequently used technology for the production of cores. [1] Characteristic defect castings of ferrous alloys, which often accompanies the use of amine -Cold box cores are veining . Survey , it was found that 77 % of those surveyed foundries have problems with veining, 71 % foundries solves this problem ( or try to tackle ) anti veining ingredients in nuclear and molding compounds , but only 29 % considered their " antiveining " method for successful and favourable. [2] Article discusses the possibilities of elimination veining. Ingredients called additives lower the temperature at which the SiO2 begin to soften and form a melt at the surface of the grains, reduce the reactivity and increase the temperature of transition to a tridimit and cristobalit. These passages encourage increased tensions subsurface sand and reduce stress for the formation of veining on the surface of the core or mold. Experiments were performed to assess the impact of silica sands and the impact of additives on the quality of the casting surface.

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Archives of Foundry Engineering

Hudák,

Gyarmati,

Varga

2020

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Foundry sand is the main element of sand mixtures from which molds or sand cores are made. Due to the continuous development of coremaking technologies, the selection of the right type of base sand becomes more and more important. The major features of foundry sand are determined by the following factors: chemical and mineralogical composition, sand grain size, grain size distribution, sand grain shape, and surface quality. The main goal of our research was to develop a qualification method that can be used to predict the characteristics of sand cores made from different sand types. Samples made from different types of foundry sand were used during the research whose properties were examined with a new qualification system, and then its connection with the gas permeability of sand cores was analyzed.Based on the research results, a strong correlation could be established between the suggested quality indicators: CQi (Core Quality Index), CG (Coefficient of Granulometry), and permeability.

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Impact of Silica Sand Granulometry on Bending Strength of Cores Produced by ASK Inotec Process

Cited by 3 publications

References 2 publications

Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Influence the Composition of the Core Mixture to the Occurrence of Veining on Castings of Cores Produced by Cold-Box-Amine Technology

Archives of Foundry Engineering

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