Domnita Fratila

Universitatea Tehnica Cluj-Napoca, Klausenburg, Cluj, Romania

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Publications (7)12.99 Total impact

  • Domnita Fratila · Cristian Caizar ·
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    ABSTRACT: This paper outlines the Taguchi optimization methodology, which is applied to optimize the cutting parameters in face milling when machining AlMg3 (EN AW 5754) with HSS (high speed steel) tool under semi-finishing conditions in order to get the best surface roughness and the minimum power consumption. Beside the conventional flood lubrication, the investigations include the minimal quantity lubrication and the dry milling. These environment-friendly cutting techniques are considered two practical ways to the cleaner manufacturing in the context of the sustainable production. The parameters evaluated are the cutting speed, the depth of cut, the feed rate and the cooling lubrication techniques (cutting fluid flow). The appropriate orthogonal array, signal to noise (S/N) ratio and Pareto analysis of variance (ANOVA) are employed to analyze the effect of the mentioned parameters on the good surface finish (surface roughness). This paper illustrates the application of the techniques for single performance characteristics optimization, which employs the weighting factors to each of the S/N ration of the responses to obtain a multi-response S/N ratio for each trial of the orthogonal array and, finally, a single optimal process parameters setting. Using Taguchi method for the design of experiments (DOE), it is investigated the significant influence and the parameters interaction effect with minimum number of trials as compared with a full factorial design.
    Journal of Cleaner Production 04/2011; 19(6-7):640-645. DOI:10.1016/j.jclepro.2010.12.007 · 3.84 Impact Factor
  • Domnita Fratila ·
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    ABSTRACT: This paper focuses on investigating several aspects of the machining process from an ecological perspective, the result being a macro-level analysis. The analysis presented here considers not only the environmental impact of the material removal process itself, but also the impact of the associated processes such as the material preparation, and the scrap processing. A macro-level assessment of the comparative life cycle environmental performance of the near-dry machining (NDM) using TiN-coated carbide tools and the flood machining (FM) is performed by a case study referring to the gear milling. The assessment, using the SimaPro 7.1.5 software and the ecoinvent1.5 database, includes combined Life Cycle Assessment (LCA) of the workpiece material, the scrap processing, the use of lubrication, and the energy consumption.
    Journal of Cleaner Production 07/2010; 18(10-18):1031-1039. DOI:10.1016/j.jclepro.2010.01.017 · 3.84 Impact Factor
  • Domnita Fratila · Adrian Radu ·
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    ABSTRACT: The paper considers the thermal processes in gear machining being focused on comparison of several cooling and lubricating techniques used at gear milling. The study represents just a part of a complex research concerning the implementation of environment-friendly techniques to gear milling. The issues in the field of stationary heat transfer were conducted using finite elements analysis, a widely applicable method in engineering using Algor software. Modeling of steady thermal state in the gears at the end of the milling process has been done using the results of experimental researches and consisted of several steps: creation of gear model based on geometrical parameters; setting of boundary conditions; modeling of stationary thermal fields in the gear after processing by five different cooling methods; graphs of strains variation and heat stress; processing and interpretation of results. KeywordsGear milling-Minimal quantity lubrication-Thermal stress-Thermal displacements
    International Journal of Advanced Manufacturing Technology 04/2010; 47(9):1003-1012. DOI:10.1007/s00170-009-2238-x · 1.46 Impact Factor
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    Domnita Fratila ·
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    ABSTRACT: One of the main environmental pollution sources related to machine building industry is the huge amount of cutting fluids which are supplied during the machining processes. In order to avoid the problems induced by cutting fluids' usage, considerable progress has been recently made in the field of near-dry machining (NDM). Converting conventional processes to minimal quantity lubrication (MQL) methods imposes new tasks' classification within the tribiological system in order to guarantee the process safety and product quality. This paper gives an overview on some requirements to be considered for a successful MQL application into industrial practice. Its last part is focused on the evaluation of NDM effects on the gear milling process efficiency, with respect to hob wear, surface quality, cooling effect, and environment protection.
    Journal of Cleaner Production 06/2009; 17(9-17):839-845. DOI:10.1016/j.jclepro.2008.12.010 · 3.84 Impact Factor
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    ABSTRACT: This paper presents three different Microassembly examples. The first part of the paper presents a solution based on a laser system, next a contact-less microdispensing system and finally an innovative hot air stream joining system. One of the most remarkable differences between these methods is the different material requirements: meanwhile the laser system requires that one of the joint components is optically transparent, the other two systems do not have this constraint but require compatibility between glue and parts.
    4M2007 Conference on Multi-Material Micro Manufacture, Bulgaria; 10/2007
  • Domnita Fratila · Wemer Palfinger · Silvia Bou · Ana Almansa · Wolfgang Mann · C. Wogerer ·
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    ABSTRACT: Adhesive dispensing - transferring of correct quantity of adhesive to the correct locations on the substrate and ensuring the adhesive remains in location until hardened - is a key process in adhesive bonding. Single part adhesive can be applied directly. Multi-component adhesives need to be mixed either before or during application. The methods and degree of advanced technology employed vary considerably between industry and applications. In lower volume and craft based industries the adhesive is often applied manually directly from a cartridge (e.g. using a sealant gun, or using a tool) to transfer and place the adhesive. In other industries (e.g. packaging or automotive) automated dispensing is more common. Electronics provides one of the most challenging tasks for adhesive dispensing-small components must be bonded precisely in position at high production rates. Dispensing technology in the electronics industry is being developed to meet this need [DUN 03].
    Assembly and Manufacturing, 2007. ISAM '07. IEEE International Symposium on; 08/2007
  • Ana Almansa · Silvia Bou · Domnita Fratila ·
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    ABSTRACT: Mechatronic competences represent a strong component in Microsystems Technologies, but very especially in Microhandling and -assembly, a field with challenging requirements. The Research and Training Network Advanced Methods and Tools for Handling and Assembly in Microtechnology (ASSEMIC) addresses this research field at a European scale. This paper presents aspects of the ASSEMIC project and some results achieved in its frame. Full Text at Springer, may require registration or fee
    IFIP International Federation for Information Processing 08/2006; 198. DOI:10.1007/0-387-31277-3_31