Theoretical Regulation of Delimitation of Metal Level Decrease in the Furnace in Case of Pneumatic Dosing Device of Metal

Ružbarský, Juraj; Majerník, Rastislav

doi:10.21062/ujep/x.2017/a/1213-2489/mt/17/1/84

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…1. low speed -laminar filling (up to 0.3 m.s -1 ) 2. medium speed -continuous turbulent filling (0.5 -15 m.s -1 ) 3. high speed -disperse filling (25 -30 m.s -1 ). Based on the aforementioned point of view of the final quality of casting, the speed of mould cavity filling determined the filling mode and the casting temperature influences the thermal model of the mould and the casting [Ruzbarsky 2017, Cho 2014.…”

Section: Pressing Speedmentioning

confidence: 99%

“…In the interval of alloy crystallization, it is the case of two properties -viscosity and initial stress [Miglierini 2004]. The following relation is applicable for the initial stress of alloy in the interval of crystallization [Ruzbarsky 2020]: The following relation is applicable for viscosity in the interval of crystallization [Ruzbarsky 2017]:…”

Section: Mould Cavity Filling Timementioning

confidence: 99%

“…Figure 3. Scheme of the flowing fluid layers according to Newton´s Law [Ragan 2006]The following is applicable for the fluids following the Bingham Law[Ruzbarsky 2017]:…”

mentioning

confidence: 99%

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Influence of Die Casting Speed on Properties of Casting Based on Al-Si Alloys

Ružbarský¹

2022

MM SJ

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The paper focuses on the research of the influence of chosen technological parameters of die casting on the selected mechanical properties of castings based on Al-Si alloys. The experiments conducted within the frame of the practical part examined the plunger pressing speed in the mould cavity influencing the mechanical properties of a casting which were represented by ultimate tensile strength and percentage share of porosity of Al-Si castings. Plunger pressing speed is closely related to mould cavity filling mode which affected the final porosity of casting. In the case of increased percentage porosity share, the ultimate tensile strength decrease was detected due to the reduction of the cross-section area of the casting. The increase in percentage porosity share in the casting was caused by the increase in plunger pressing speed. To achieve the desired quality of castings, higher production efficiency, and reduced occurrence of faulty pieces during production, an optimal set of technological parameters of die casting is inevitable.

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Section: Pressing Speedmentioning

confidence: 99%

Section: Mould Cavity Filling Timementioning

confidence: 99%

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Influence of Die Casting Speed on Properties of Casting Based on Al-Si Alloys

Ružbarský¹

2022

MM SJ

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“…According to Ragan [5] the resistance pressure influences the thin-walled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well [11,18].…”

Section: Fig 11 Detail Of Metallographic Structure Of the Thin-walled Cast From Alloy Al-si12cu1(fe) X 100 ηM A) Resistance Pressure Of 3mentioning

confidence: 99%

Possibilities of Pressure Die Casting of Iron Alloys

Ružbarský

Sitko

2019

Management Systems in Production Engineering

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The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thin-walled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.

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“…It is possible to reach by raising pressure of the machine working medium or lowering of the pressing piston diameter in the filling chamber. In both cases it is a danger of overcoming the die casting machine closing force (Ružbarský and Majerník, 2017). From it wastes that the value of the alloy viscosity it is not allowed to overcome the belonging frontier.…”

Section: Viscositymentioning

confidence: 99%

Properties of alloys in the crystallization interval

Ružbarský

2019

Multidisciplinary Aspects of Production Engineering

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In the contribution the high growth of viscosity and initial stress of alloys in the crystallization interval with undercooling against of the liquidus follows from theoretical analysis. At these alloys used in pressure die casting the permissible undercooling that does not endanger pressure die casting operation. The application of the device for die temperature regulation ensures the safe operation.

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Theoretical Regulation of Delimitation of Metal Level Decrease in the Furnace in Case of Pneumatic Dosing Device of Metal

Cited by 4 publications

References 7 publications

Influence of Die Casting Speed on Properties of Casting Based on Al-Si Alloys

Influence of Die Casting Speed on Properties of Casting Based on Al-Si Alloys

Possibilities of Pressure Die Casting of Iron Alloys

Properties of alloys in the crystallization interval

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