44 research outputs found
Multi-objective optimization in CNC turning of S45C carbon steel using Taguchi and grey relational analyses
No full textThere are various types of machining process that have been introduced long time ago and yet still be used until now. From time to time, researchers have never stop in seeking for an improvement for these processes in every aspect. One of the famous machining processes
that are commonly used is turning process. Interestingly, the optimization of single
performance measures has been successfully reported by many of the researchers.
However, the multi-objective optimization is more difficult and challenging to be studied
due to its complexity. This is because an improvement of one performance measure may
lead to degradation of other performance measure. In response to that, the study of multiobjective
optimization in CNC turning of S45C carbon steel by using Taguchi and Grey
Relational Analysis (GRA) method has been reported in this study. Based on grey
relational analysis, a grey relational grade (GRG) is computed to optimize the machining
parameters of CNC turning process with multiple performance measures which is surface
roughness, material removal rate (MRR), tool wear and power consumption of the machine.
In this study, two important parameters have been selected, namely spindle speed and feed
rate while the depth of cut was set at fixed value. A design of experiment methodology was
employed to determine the relationships between machining parameters with the
performances measures. Through this method, the best setting parameter was found at
spindle speed of 3000 RPM and feed rate of 0.2 mm/rev and results from ANOVA shows
that spindle speed is the main contributor to the change of performance measures with
almost 70% contribution. The findings from this study will benefit in term of knowledge
between the machining parameters with the performance measures
Design and implementation of a robotic model for Virtual Reality (VR) application
No full textAccess is limited to UniMAP community.In this project, a virtual robotic environment of the Flexible Manufacturing System (FMS) laboratory at Kg Wai, UniMAP has been developed. The virtual robotic
environment consists of two ABB robots and a conveyor system. The development of virtual environment integrates Autodesk Inventor 9.0 CAD system with 3D Studio Max and a Cortona VR player. Autodesk Inventor 9.0 is used to model and assembled the ABB robot components and the conveyor system. The 3D Studio Max is a tool to obtain a 3D graphics models for the manufacturing lines and is used in this project in order to transfer the CAD model into Virtual Reality Modeling Language (VRML) format. From the modeling in Autodesk Inventor, it must be convert to format file which is IGES file before import them to 3ds Max. In 3ds Max, that layout must be exported to another format file which is ‘.wrl’ or VRML. The VRML format is necessary for the VR environment simulation. The VR environment is simulated in the Internet Explorer (I.E) which is web browser via Cortona VR player plug-in by just drag the ‘.wrl’ files to window web browser. The simulation layout of Flexible Manufacturing System will appear in web page window and it can be analyzed
Experimental and analytical study of drilling hybrid glass/carbon fibre reinforced epoxy composite
No full textDoctor of Philosophy in Manufacturing EngineeringHybrid composites have become increasingly attractive in research and development activities in recent times due to the capabilities to tailor their mechanical performance or characteristics to specific needs. Current research and innovation in the field of hybrid composites include processing, development and testing of metal matrix hybrid composites as well as the synthetic
and natural fibre hybrid composites. Nonetheless, a number of complications arise in the manufacturing processes, particularly in machining such as drilling, of these multiphase laminated materials. The fact is that machining of composites or hybrid composites presents a great challenge due to anisotropic nature of the material, lack of plastic deformation and
abrasiveness of the fibre reinforcements. According to the previous statistic studies,
unqualified holes leads to approximately 60 % part rejections during the final assembly process.
Therefore, this research study pursues an experimental and analytical approaches to extend the
fundamental knowledge in drilling hybrid fibre reinforced polymer (FRP) composites. Prior to
the drilling tests, the evaluations of the mechanical performance of hybrid FRP composite have
been attempted. Specifically, the hybrid effect of the plain woven carbon and E-glass fibres
hybrid composites within an epoxy polymer matrix was experimentally evaluated. It was
evident that the physical properties and mechanical strength of monolithic fibres composite
were enhanced 48 % by hybridising carbon fibres into the glass FRP composites. In addition,
theoretical analysis through the rule of mixture reveals that the hybrid FRP composites have
exhibited a positive hybrid effect in term of tensile and flexural behaviors. Even though
fabrication technology for the hybrid FRP composites has well advanced in the production of
near-net shape components, the secondary machining process is vital for completing the postmanufactured
of these materials. Thus, the desired setting for minimising the delamination
damage and surface roughness were determined using the Taguchi methodology and statistical
analyses
Using Pattern Matching technique for feature recognition of STEP file
No full textAccess is limited to UniMAP community.This project utilizes the pattern matching technique for feature recognition of STEP file. It is proposed as an input for automatic feature recognition in the Computer
Aided Design and Manufacturing (CAD/CAM) application. The project explores the
pattern matching technique for feature recognition of part especially from B-Rep data structure. This method accomplish their task based on recognition of features as pattern made up topological entities such as face, edges, and vertices. It will easily recognize isolated features and simple interacting features. That technique used standard for the exchange of product information (STEP) formats for geometrical data extraction representation to matching that the coordinate from the STEP file to decide the correct surface part in the design
Design of Fuzzy Logic Model for the Prediction of Tool Performance During Machining of Composite Materials
No full textAbstractComplexity of the machining process, the nonlinear relationship between parameters, and the random variations of material properties make the prediction of tool life during machining of composite material a challenge. Therefore, this article reports on the application of fuzzy logic technique for modelling of the useful life of the end mill cutter while machining under the aforesaid process. Dry end milling experiments were conducted to gather experimental data, followed by the design of Mamdani fuzzy inference system (FIS) so as to perform fuzzy logic correlation between the employed machining conditions with the tool life. Results showed remarkable prediction of tool life when compared to the experimentally determined values. Confirmation tests of randomly selected conditions were also undertaken to further demonstrate the effectiveness of the proposed model
Multi-objective optimisation of machining fibre reinforced composites
No full textLink to publishers homepage at http://scialert.netSince the inception of their wide use in the 1960s, advanced composite materials such as Fibre Reinforced Polymer (FRP) composites have seen an exponential growth in application for various engineering fields. FRP composites are normally produced near to net-shape, yet they are often subjected to final machining processes in order to meet the required geometric features and dimensional accuracies. Hence, this paper describes the use of Taguchi orthogonal array coupled with the Grey relational analysis to facilitate the optimisation of multiple machinability characteristics during end milling of Glass Fibre Reinforced Polymer (GFRP) composites. Based on the results of Taguchi experiments, the Grey relational grade was determined from the Grey analysis to solve the multiple machinability characteristics of tool life, machining forces and surface roughness. The results suggested that feed rate have the most significant influence on the multiple machinability characteristics. Confirmation test revealed that the Taguchi-Grey analysis can be effectively used to determine the multiple machinability characteristics and consequently improve the end milling of GFRP composites
Green Biocomposites for Packaging Applications
No full textIn recent years, research on environmentally sustainable packaging has been gaining momentum, primarily driven by consumer ecological consciousness. Green biocomposites play an important role in novel and innovative materials for the emerging sustainable packaging industry, being intrinsically biobased and biodegradable. Therefore, the following chapter is aimed to make an overview of the main trends on green biocomposites study and development, their environmental impact and their importance in future production systems. A revision of the polymeric matrices and fillers most widely used for green biocomposites and bionanocomposites manufacture is done, and the results of the latest investigations on the subject are discussed. Besides, their role in active and intelligent packaging is reviewed as well as their implementation for 3D printing technologies. Finally, the relevance of these materials study and development in terms of environmental impact is herein considered, remarking the importance of adequate life cycle assessment of the developed green biocomposites in comparison to conventional materials used for similar packaging applications.Fil: Versino, Florencia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentina. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; ArgentinaFil: Lopez, Olivia Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: García, María Alejandra. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentin
Damage to Carbon Fiber Reinforced Polymer Composites (CFRP) by Laser Machining: An Overview
No full textCarbon fiber reinforced polymer or CFRP composite is the most sort-after material for aircraft manufacturing today and commercial aircraft manufacturers are critically attempting to solve the delamination problem as well as other damages. On the other hand, implementation of laser technology in cutting and drilling composites is now becoming more important as an alternative solution for machining of composites. The major obstacles in laser machining of composites for industrial applications are typically related to inferior kerf width (due to tapered cut), heat-affected zone (HAZ), charring, matrix recession, protruding fibers and potential delamination. Therefore, it is desirable to optimize the machining parameters in order to control the level of heat-induced in machining of CFRP composites. Currently, no comparative study has been conducted between the effects of ring shape and spiral trepanning, which this study might be the potential to apply on drilling thick CFRP composites. High powered lasers are also important in drilling thick CFRP composites. This article reviews the experimental progress in laser machining of CFRP composites, which is intended to help readers to obtain the latest views in order to develop the appropriate machining parameters
Analytical study of critical thrust force for on-set delamination damage of drilling hybrid carbon/glass composite
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