Wyniki wyszukiwania - BazTech

1

Application of contemporary engineering techniques and technologies in the field of dental prosthetics

Budak I, Kosec B., Sokovic M.

Journal of Achievements in Materials and Manufacturing Engineering

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2012

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Vol. 54, nr 2

233--241

EN

Purpose: During the last couple of decades, development of medical science has been marked with an ever more pronounced interdisciplinary character which, in part, can be attributed to various engineering applications. Rapid development of computer-aided technologies, which completely transformed production engineering, also left an indelible mark on dental prosthetics. Striving towards its primary goal - primum non nocere (’Above all, do not harm!’), the area of dental prosthetics has introduced numerous novel technologies and methods which allow manufacture of precision, custom-made, optimal dental replacements. Design/methodology/approach: The aim of research - to contribute to integration of modern engineering technologies and computer-aided systems into dental prosthetics with special emphasis on efficient manufacture of dental replacements with precision which allows clinical applicability. The subject scope of the paper comprises modelling, manufacturing with special emphases on materials, quality inspection and environmental impact assessment (cleaner production). Findings: In the industrially developed countries, efforts have been concentrated towards advancement of modelling and manufacture of dental replacements by introducing modern computer equipment and state-of-the-art materials and machining technologies. However, in countries in transition, dental replacements are predominantly manufactured in a traditional, manual way prone to errors. The reasons for this situation are various. Practical implications: It is expected that this trend will have a significant impact on the further development of production engineering techniques and technologies in the near future. Originality/value: The paper evolved on the premise that there is a room for more intensive co-operation between the two disciplines - dental prosthetics and engineering, with a prospect for success of the development of novel, original solutions. In that sense, this paper should serve to both professions - production engineers and dentists.

2

Industrialisation of Easy Boom

Justin R., Sokovic M.

Archives of Materials Science and Engineering

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2011

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Vol. 47, nr 2

110-116

EN

Purpose: Reason for writing the paper is to present the project of design and industrialization of floating containment boom made of PVC material, which was successfully finished in 2010. This project was supported by Savatech d.o.o. Kranj. Design/methodology/approach: Research methodology of floating containment boom made of PVC has focused on a comprehensive analysis of this type of booms, which are used around the world. Based on this knowledge and over 25 years of experiences with rubber booms, a new type of PVC boom was developed. Findings: The result of the project was the design and implementation of a new type of floating containment boom. The new boom is light weight, highly stable with no inflation system required. Boom has small volume when packed for transport and is simple and quick to deploy. It is made of UV and oil resistant material. Practical implications: The new type of oil boom was tested in clean water and is available for application in oil spill accidents. Also calculations for salt water were made. Boom is suitable for closed waters, rivers and streams, harbours, canals, etc. Originality/value: Product of research and development is an original Slovenian PVC floating containment boom marked as Easy Boom.

3

Shipbuilding pipeline production quality improvement

Buksa T., Pavletic D., Sokovic M.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 40, nr 2

160-166

EN

Purpose: The pipeline production is one of major processes in shipbuilding industry. Quality improvement and risk assessment in this process can yield significant savings, both in terms of internal quality costs as well as in terms of customer satisfactions. Design/methodology/approach: Shipbuilding pipeline production quality improvement has been carried out by application of FMEA (Failure Mode and Effect Analysis) method. For the successful implementation of FMEA method it is necessary to identify process failure modes or possibility of the appearance of non-compliance, as well as their possible causes. For qualitative analysis of key input variables of the process, in the paper is used Ishikawa diagram and p-chart. Findings: It is shown that proposed approach to risk assessment in shipbuilding pipeline production is applicable to real casa scenario. The analysis has identified the points in the process with the highest probability of occurrence of nonconformities, or the highest risk for error. Research limitations/implications: As the experimenting has been conducted in shipyard, within production process, research schedule must have been set in accordance with production pace. Also, due to character of production process the data collecting was adopted to the production plan in that particular moment. Practical implications: Dealing with causes of potential nonconformities in the process can significantly contribute to the reliability and robustness of the process. Corrective actions that have been taken based on results of analysis significantly contributed to the level of quality in the pipeline production process. Originality/value: The pepper is dealing with a well known method applied in different production environment that are mostly conservative in production approach. It was shown that successful application of proposed approach can yield benefits especially in improved quality of produced pipelines within shipbuilding industry.

4

Quality Improvement Methodologies - PDCA Cycle, RADAR Matrix, DMAIC and DFSS

Sokovic M., Pavletic D., Kern Pipan K.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 43, nr 1

476--483

EN

Purpose: of this paper is to introduce the reader to the characteristics of PDCA tool and Six Sigma (DMAIC, DFSS) techniques and EFQM Excellence Model (RADAR matrix), which are possible to use for the continuous quality improvement of products, processes and services in organizations. Design/methodology/approach: We compared the main characteristics of the presented methodologies aiming to show the main prerequisites, differences, strengths and limits in their application. Findings: Depending on the purpose every organization will have to find a proper way and a combination of methodologies in its implementation process. The PDCA cycle is a well known fundamental concept of continuous-improvement processes, RADAR matrix provides a structured approach assessing the organizational performance, DMAIC is a systematic, and fact based approach providing framework of results-oriented project management, DFSS is a systematic approach to new products or processes design focusing on prevent activities. Research limitations/implications: This paper provides general information and observations on four presented methodologies. Further research could be done towards more detailed study of characteristics and positive effects of these methodologies. Practical implications: The paper presents condensed presentation of main characteristics, strengths and limitations of presented methodologies. Our findings could be used as solid information for management decisions about the introduction of various quality programmes. Originality/value: We compared four methodologies and showed their main characteristics and differences. We showed that some methodologies are more simple and therefore easily to understand and introduce (e.g. PDCA cycle). On the contrary Six Sigma and EFQM Excellence model are more complex and demanding methodologies and therefore need more time and resources for their proper implementation.

5

Quality tools - systematic use in process industry

Paliska G., Pavletic D., Sokovic M.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 25, nr 1

79-82

EN

Purpose: The paper is dealing with one segment of broader research of universality systematicness in application of seven basic quality tools (7QC tools). The research was carried out in different areas that include power plant, process industry, government, health and tourism services. The aim of the research was to show on practical examples that there is real possibility of application of 7QC tools. Furthermore, the research has to show to what extent are selected tools in usage and what reasons of avoiding their broader application are. The simple example of successful application of one of quality tools are shown on selected company in process industry. Design/methodology/approach: In the research each of 7QC tools have been tested and its applicability in the frame of selected business has been shown. Systematic approach is explained on the example of selected company in process industry which is ISO 9000:2000 certified. Findings: Conducted research has shown that there is possibility of systematic application of all of the 7QC tools in the frame of companies' overall quality management system. The research has also shown that 7QC tools are not so wide spread as expected, although they are quite simple for application and easy to interpret. The further investigation should be carried out in order to find reasons for such condition, and, in accordance, to define appropriate corrective actions to eliminate or minimize that problem. Practical implications: The partners in research were from different area of business, as stated above. To each partner has been shown in what manner can quality tools are applied and how formal quality management system can help in process improvement on day-to day basis. Originality/value: The main value of conducted research is, in author's opinion, to show to each partner in research that all of 7QC tools can be successfully applied within their own business. Also, the correlation between formal quality management system and 7QC tools has been research and shown that formal quality management system has positive influence and is supportive to application of 7QC tools.

6

Identification of scanning errors using touch trigger probe head

Sokovic M., Cedilnik M., Kopac J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

383-386

EN

Purpose: Creation of a mathematical model, which combine ball tip radius error and small tilt of the stylus to determine translational motion (in two directions) of the stylus ball centre, due to the surface slope. Design/methodology/approach: First error is described on two dimensional model, thus is very simple. Second model is based on 3D-mathematical model, which is a basis to determine (and plot) translational movement of the stylus ball according to surface slope. Findings: Accurate scanning process on freeform surface with touch trigger probe head could not be performed, due to number of reasons connected to the stylus ball and trigger probe head errors. Research limitations/implications: According to nature of this problem, 4D, 5D and 6D-graphs could not be plotted, which would define translational motion of the stylus ball centre at any slope surface. Practical implications: Understanding the physical model for described error is a basis to create mathematical compensation error model. Originality/value: No such mathematical model to determine translational motion (in two directions) of the stylus ball centre was published in any paper before.

7

Failure and surface temperature analysis of working surface of die-casting die

Kosec B., Sokovic M., Kosec G., Bernetic J.

Archives of Materials Science

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2007

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Vol. 28, nr 1-4

63-68

EN

Die-casting is the most cost efficient and technical easy method of casting sophisticated and accurate aluminium alloys parts in great-scale series. Aluminium alloys die-castings require little machining prior the final installation. Die-casting dies for casting of aluminium alloys fail because of a great number of different and simultaneously operating factors. Die design, material selection, and thermal stress fatigue generated by the cyclic working process, as well as to low and inhomogeneous initial die temperature contribute to the failures and cracks formation on/in dies for die-casting of aluminium alloys. In the frame of the presented investigation work the intensity and homogeneity of the temperature, fields on the working surface of the testing die were checked through thermo graphic measurements, and failures and cracks on the working surface of the die were analysed with nondestructive metallographic examination methods.

8

Design approach in management toward to business excellence

Bobrek M., Majstorovic V., Sokovic M.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 16, nr 1-2

184--189

EN

Purpose: The main aim of this paper is to elaborate using design approach to building Integrated Management Systems (IMS) of organization to trace their own and dependable way to business excellence. Design/methodology/approach: The basic theories used to achieve the aim are: system engineering and architecting, system integration by managing of the interactions among its elements and the social model of management. The theoretical scope of this paper is to find appropriate model of integration based on main principles of mentioned modern management disciplines. Findings: At the beginning of design process of IMS lays Quality Management System (QMS) structured in accordance with ISO 9000 which allows organizations to use recognizable management practice and select properly quality tools for improvement of their core business processes. Research limitations/implications: There are different ways and concepts of integration on the road to business excellence. Design approach enables organizations to find their own road to improvement of business performances by selecting properly tools and methods. Practical implications: As outcome, the authors recommend the graphical presented concept to organizations that have the ambition to join the path of business excellence. Originality/value: Results of this paper are intended for designers of management systems. Presented model sets framework of methodology for design process of IMS which is mainly new for managers.

9

Case of introduction of new ecologically safe material

Kosec B., Sokovic M., Kosec L., Bizjak M., Kampus Z.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

85--88

EN

Purpose: In European Union countries by January 1st 2007 at the latest, all articles and products containing cadmium will either have to be withdrawn from sale or an appropriate substitute for this heavy metal will have to be found. Design/methodology/approach: The present technology of production of fuses in Slovenian firm ETI Elektroelement and the action thereof are adapted to the existing ecologically harmful alloy of tin and cadmium SnCd20, which ought to be replaced by one or more ecologically safe alloys with technological and application properties as similar as possible to the existing ones. Findings: In the frame of our common investigation work we have found that the stated problems can be successfully solved by the low melting alloy of tin, bismuth and antimony named ETI-Sn-Bi-Sb. Research limitations/implications: Alloy is ecologically safe, and by its technical and physical properties corresponds to the requirements of the use for fusible elements of low voltage fuses. Practical implications: Practical implications of this work is in introduction of new ecologically safe material for fusible elements, without cadmium in the existing technology of low voltage fuses. Originality/value: Originality and high value of our engineering work is confirmed by two Slovenian national patents and European Union patent for the ecologically safe low melting alloy ETI-Sn-Bi-Sb, which received Slovenian firm ETI Elektroelement and authors of this paper.

10

Surface and surface coating quality

Sokovic M.

Tribologia

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2000

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nr 1

76-89

PL

Inżynieria powierzchni traktowana jest obecnie jako dziedzina umożliwiająca technologii z większym powodzeniem, bardziej efektywnie i skuteczniej wykorzystać materiały w praktyce inzynierskiej. Jako że zastosowanie powłok staje się coraz powszechniejsze, to istnieje potrzeba doboru jakości wytrzymałości tych powłok zarówno ze strony dostawców jeżeli chodzi o monitorowanie procesu, jak i ze strony użytkowników, jeżeli chodzi o dobór właściwości powłok do określonych zastosowań. Aby móc wytwarzac takie powłoki i metody obróbki powierzchni, dające się zastosować na przykład w przemyśle, istnieje potrzeba ustalenia, oszacowania i spełnienia odpowiednich procedur zapewnienia jakości.

EN

Surface engineering , now recognized as an enabling technology of major importance in the successful, most efective, and efficient exploitation of materials in engineering practice. As the use of surface coatings becomes widespread, the need to assess the quality and reliability of these films becomes more important, both for coating suppliers as a means of process monitoring and for users as a means of identifing whether the properties of the coating are suitable for the intended application. In order to produce such coatings and surface treatments acceptable for us in, for example, the manufacturing industry, there is need to establish, evaluate, and implement appropriate quality assurance procedures.