Wyniki wyszukiwania - Biblioteka Nauki

1

Etapy kształtowania jakości odlewów z żeliwa szarego

100%

Siekański K. , Borkowski S.

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tom R. 2, nr 6

207-212

PL

W artykule zajęto się analizą całego procesu produkcji odlewniczej, przedstawiono model zarządzania jakością w odlewni żeliwa. Proces odlewania podzielono na etapy i w każdym z nich wskazano czynniki decydujące o tym, by wyrób końcowy procesu był jak najwyższej jakości. Omówiono także czynności kontrolne podejmowane na każdym z wyróżnionych etapów produkcji.

EN

In work it was presented analysis of each stages of casting process from the moment of batch preparation to the obtainment of finished product. The investigative object was the foundry in which are producing parts of machines for heavy industry. In analysis procedure it ascertained, that high quality of finished product decide mostly the stages of production connected with batch preparation, execution of moulds and dressing casting process.

2

Investment Casting vs Replicast CS Considered in Terms of the Ceramic Mould Making and Dimensional Accuracy of Castings

100%

Karwiński A. , Haratym R. , Biernacki R. , Soroczyński A.

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tom Vol. 14, iss. 1

45--48

EN

The article presents an analysis of the applicability of the Replicast CS process as an alternative to the investment casting process, considered in terms of the dimensional accuracy of castings. Ceramic shell moulds were based on the Ekosil binder and a wide range of ceramic materials, such as crystalline quartz, fused silica, aluminosilicates and zirconium silicate. The linear dimensions were measured with a Zeiss UMC 550 machine that allowed reducing to minimum the measurement uncertainty.

3

Ultradźwiękowa kontrola jakości odlewów z żeliwa

84%

Orłowicz W.

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2001

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tom R. 1, nr 1

211--226

PL

Badania nieniszczące są jedną z metod zminimalizowania kosztów zarządzania ryzykiem w nowoczesnej gospodarce. W referacie opisano sposób prowadzenia badań ultradźwiękowych odlewów żeliwnych.

EN

Non-destructive testing (NDT) is one of the methods to minimize costs of risk management in modern economy. The paper describes the manner of conducting the ultrasonic testing of iron castings.

4

Quality of automotive sand casting with different wall thickness from progressive secondary alloy

84%

Pastierovičová L. , Kuchariková L. , Tillová E. , Chalupová M. , Pastirčák R.

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2022

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tom Vol. 28, Iss. 2

172--177

EN

This paperwork is focused on the quality of AlSi6Cu4 casting with different wall thicknesses cast into the metal mold. Investigated are structural changes (the morphology, size, and distribution of structural components). The quantitative analysis is used to numerically evaluate the size and area fraction of structural parameters (α-phase, eutectic Si, intermetallic phases) between delivered experimental material and cast with different wall thicknesses. Additionally, the Brinell hardness is performed to obtain the mechanical property benefits of the thin-walled alloys. This research leads to the conclusion, that the AlSi6Cu4 alloy from metal mold has finer structural components, especially in small wall thicknesses, and thus has better mechanical properties (Brinell hardness). These secondary Al-castings have a high potential for use in the automotive industry, due to the thin thicknesses and thus lightweight of the construction.

5

Application of X-S Control Cards to Parameter Control in the Machining Process of Piston Castings for Internal Combustion Engines

84%

Krępa A. , Piątkowski J.

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tom Vol. 21, iss. 4

116--120

EN

This article discusses the possibility of using a two-track X-S control card on a Mesas device to control the production process parameters of piston castings for combustion engines. The research was carried out at the Federal-Mogul Gorzyce company. The basis for estimating the variability of the process results from the mean value (X) is the standard deviation (S). Thanks to specially designed measuring stations that use algorithms to calculate process indicators (Cp and/or Cpk) and their visualization, the cost of manufacturing products and the number of non-compliant products (scraps) are reduced. The process stability was investigated by measuring the key dimensions of the piston casting in a specific population and a given measurement cycle. Taking into account the precision of details, their technical condition, and surface quality, the production machines and cutting tools were optimally selected. It has been found that an important element of the effective use of Statistical Process Control (SPC) are trained/experienced operators who can correctly interpret the resulting control chart forms.

6

Analysis of influence of chemical composition of Al-Si-Cu casting alloy on formation of casting defects

84%

Dobrzański L. A. , Krupiński M. , Zarychta P. , Maniara R.

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tom Vol. 21, nr 2

53-56

EN

Purpose: A methodology of the computer-aided determining relationship between chemical composition of aluminium alloy and castings quality was presented in the paper. Design/methodology/approach: To resolve the problem artificial neural networks were used. Classification problems were evaluated by the consideration mainly the values of mistakes and correct answers of networks for test data. On the basis of data analyzed by the neural network, which has the best quality classification of chemical composition of tested material, the concentration of alloying elements range, which have an effect on formation casting defects, were developed to eliminate them in the future. Findings: Combining of all methods making use of chemical composition of aluminium alloy and neural networks will make it possible to achieve a better casting quality. Research limitations/implications: The presented issues may be use, among others, for manufacturers of car subassemblies from light alloys, where meeting the stringent quality requirements ensures the demanded service life of the manufactured products. Originality/value: The correctly specified number of chemical composition of aluminium alloy enables such technological process control where the number of castings defects can be reduced by means of the proper correction of the process.