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Open access

M. Brzeziński, A. Stawowy and R. Wrona

Abstract

Systemic approach to design of factories requires that engineering, organisational and economic aspects should be considered concurrently. That prompts the need to develop a solution, based on the state-of-the-art IT technologies, to enable us to solve the problems associated with foundry production planning. The paper outlines a methodology of creating the simulation model of a virtual foundry, as a tool for foundry design. An integrative approach is suggested for development of a complete foundry model, enabling the design of more efficient production systems. The underlying principles of such models are discussed, the basic stages involved in the methodology are outlined and the range of its applicability is defined.

Open access

Z. Górny, S. Kluska-Nawarecka, D. Wilk-Kołodziejczyk and K. Regulski

Abstract

Decisions regarding appropriate methods for the heat treatment of bronzes affect the final properties obtained in these materials. This study gives an example of the construction of a knowledge base with application of the rough set theory. Using relevant inference mechanisms, knowledge stored in the rule-based database allows the selection of appropriate heat treatment parameters to achieve the required properties of bronze. The paper presents the methodology and the results of exploratory research. It also discloses the methodology used in the creation of a knowledge base.

Open access

J. Michalczyk, M. Nabiałek and M. Szota

REFERENCES: [1] V.V. Dewiatov, H.S. Dyja, V.Y. Stolbow: Modeling mathematical and optimization processes extrusions, Częstochowa 2004. [2] V.V. Dewiatov, J. Michalczyk: The method production sleeves deep from bottom. Polish Patent 206468. [3] V.V. Dewiatov, J. Michalczyk, Z. Potęga: Determination of methodology internal stresses for example calibration bar. Technical education and informatics. Scientific work - Academy. Jan Długosz in Częstochowa (2008). [4] A.A. Il’jushin: Mehanika sploshnoj sredy. Moskwa 1978. [5] Ju. I. Njashin, V

Open access

M. Sangeetha and S. Prakash

Abstract

Aluminium based metal matrix composites are widely used in automobile components such as cardan shaft of Chevrolet corvette, disc brake and engine push rod. In this experiment a Hybrid Metal Matrix Composites (HMMC) are fabricated and drilled. Drilling is the process of making slots in disc brake and thread in the engine parts. The surface quality of the drilled specimen depends on the speed, feed, drill type and the thrust force. Thrust force plays the major role in drilling the specimen. In this experiment HMMCs are fabricated using two processes-called, sonication and casting. Sonication is the process of coating the carbon nanotubes over the silicon carbide particles (SiCp). Semisolid stir casting is used to reinforce the coated SiCp in the LM 25 alloy. A drilling process is performed on HMMC to analyse the extent to which the input parameters influence the thrust force and Ovality. The tools used for drilling are solid carbide tools of three different diameters. Taguchi’s experimental design is adopted for the drilling operation. A mathematical model is used to determine the influence of input parameters on the outputs thrust force and ovality. This paper proves the combination of N3, f1 and d1 of the carbide tool results in the lowest value of thrust force and ovality while drilling HMMCs. In this work the HMMC is prepared by coating the abrasive nature, silicon carbide particle and there is a good interfacial bonding between the reinforced particle and matrix and the drilling process becomes smoother. The new being of this article is the treated ceramics, SiCp with carbon nanotubes. This HMMC shows the improved mechanical properties compared to other metal matrix composites surveyed in the literatures.

Open access

M. Nowak, Z. Nowak, R.B. Pęcherski, M. Potoczek and R.E. Śliwa

Abstract

In the present paper a finite element model was used to investigate the mechanical properties such as Young’s modulus of open-cell ceramic foam. Finite element discretization was derived from real foam specimen by computer tomography images. The generated 3D geometry of the ceramic foam was used to simulate deformation process under compression. The own numerical procedure was developed to control finite element mesh density by changing the element size. Several numerical simulations of compression test have been carried out using commercial finite element code ABAQUS. The size of the ceramic specimen and the density of finite element mesh were examined. The influence of type and size of finite element on the value of Young’s modulus was studied, as well. The obtained numerical results have been compared with the results of experimental investigations carried out by Ortega [11]. It is shown that numerical results are in close agreement with experiment. It appears also that the dependency of Young’s modulus of ceramic foam on density of finite element mesh cannot be ignored.

Open access

M. Popławski, A. Kwiatkowska and A. Piasecki

Abstract

Borided layers are mainly produced during the process of heat-chemical treatment as a result of reactive diffusion of boron inside the material. The borided layers are particularly useful in difficult exploitation conditions. Generally, the borided layers are characterized by the increased hardness, heat resistance and good corrosion resistance. It is commonly known that the major disadvantage of X-ray microanalysis with EDS method is the difficulty in light elements analysis such as boron.

However, due to the appropriate formation of source region and taking measurements during a definite period of time, the microanalysis of boron is possible. The obtained results are characterized by relative accuracy and precision.

SEM Vega 5135 Tescan, detector of Si(Li) in Prism 2000 PGT spectrometer and the PGT software Spirit 1.06 were used. The model specimen was made from cubic boron nitride (c-BN). The estimated parameters of the analysis were verified on 42CrMo4 steel and borided Armco Iron, with satisfactory results having been obtained.

Open access

J. Trzaska

low alloy steel products, in: D.V. Doane, J.S. kirkaldy (Ed.), Hardenability Concepts With Applications to Steel, The Metallurgical Society of AIME (1978). [15] B. Smoljan, J. Mater. Process. Tech. 175 , 393–397 (2006). [16] B. Smoljan, D. Iljkić, H. Novak, Journal of Achievements in Materials and Manufacturing Engineering 46 , (2), 175-181 (2011). [17] L.A. Dobrzański, J. Trzaska, Mater. Sci. Forum 437 , (4), 359–362 (2003). [18] J. Trzaska, Methodology of the computer modelling of the supercooled austenite transformations of the

Open access

T. Bajor, H. Dyja and K. Laber

This study presents the results of physical modelling of the processes of metal forming of bars made of magnesium alloy (AZ61) obtained using two research methodologies. The study employed the Gleeble 3800 testing system for simulation of metallurgical processes and a torsion plastometer. Depending on the research methodology used, the examinations were carried out in the temperature range of 200 ÷ 400°C and strain rate of (0.1 - 10 s-1). The results obtained in the study were used to determine the value of yield stress for AZ61 alloy for different strain procedures and different temperatures and strain ratios.

Open access

M. Rywotycki

Abstract

The paper presents a heat transfer model between two surfaces which are in contact under an external force. The developed heat transfer boundary condition model has been obtained using a new methodology for determining heat flux transferred between two solid surfaces. The methodology consists of two parts: experimental and numerical one. The experimental part involves measurements of temperature at specific points in two samples brought into contact. The numerical part uses an inverse method and the finite element method to calculate the heat flux at the interface.

The effect of uncertainty of input parameters for the calculation of heat transfer coefficient has been analysed. These have included: thermal conductivity, specific heat and location of thermocouples. Verification calculation with new value of input parameters for their impact on the accuracy of the solution has been done.

The calculations have been performed using original software which uses the inverse method and FEM.

Open access

K. Regulski

Abstract

The process of knowledge formalization is an essential part of decision support systems development. Creating a technological knowledge base in the field of metallurgy encountered problems in acquisition and codifying reusable computer artifacts based on text documents. The aim of the work was to adapt the algorithms for classification of documents and to develop a method of semantic integration of a created repository. Author used artificial intelligence tools: latent semantic indexing, rough sets, association rules learning and ontologies as a tool for integration. The developed methodology allowed for the creation of semantic knowledge base on the basis of documents in natural language in the field of metallurgy.