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Studies on the Process Parameters of Rapid Prototyping Technique (Stereolithography) for the Betterment of Part Quality  [PDF]
Raju Bangalore Singe Gowda,Chandra Sekhar Udayagiri,Drakshayani Doulat Narendra
International Journal of Manufacturing Engineering , 2014, DOI: 10.1155/2014/804705
Abstract: Rapid prototyping (RP) has evolved as frontier technology in the recent times, which allows direct transformation of CAD files into functional prototypes where it tremendously reduces the lead time to produce physical prototypes necessary for design verification, fit, and functional analysis by generating the prototypes directly from the CAD data. Part quality in the rapid prototyping process is a function of build parameters such as hatch cure depth, layer thickness, orientation, and hatch spacing. Thus an attempt was made to identify, study, and optimize the process parameters governing the system which are related to part characteristics using Taguchi experimental design techniques quality. The part characteristics can be divided into physical part and mechanical part characteristics. The physical characteristics are surface finish, dimensional accuracy, distortion, layer thickness, hatch cure, and hatch file, whereas mechanical characteristics are flexural strength, ultimate tensile strength, and impact strength. Thus, this paper proposes to characterize the influence of the physical build parameters over the part quality. An L9 orthogonal array was designed with the minimum number of experimental runs with desired parameter settings and also by analysis tools such as ANOVA (analysis of variance). Establishment of experimentally verified correlations between the physical part characteristics and mechanical part characteristics to obtain an optimal process parameter level for betterment of part quality is obtained. The process model obtained by the empirical relation can be used to determine the strength of the prototype for the given set of parameters that shows the dependency of strength, which are essential for designers and RP machine users. 1. Introduction Due to the advances in electronics and computers, there has been a significant growth in communication, information technology, and worldwide networking, which leads to globalization and opening of markets [1, 2]. Thus in product development, rapid prototyping (RP) and rapid product development have turned out to be the key instruments to save time and money with respect to the development of innovative products [2, 3]. Stereolithography (SLA) is one of the RP techniques, which involve fabrication of intricate shape of a plastic monomer directly from computer aided design (CAD) data by depositing material layer by layer by photopolymerization process [4]. The SLA process involves the following steps: conversion of the CAD model to the standard triangulation language (STL) file format; slicing
Automated Tools for Rapid Prototyping
Pan,Jinping
计算机科学技术学报 , 1991,
Abstract: An automated environment is presented which aids the software engineers in developing data processing systems by using rapid prototyping techniques.The environment is being developed on VAX station.It can render good support to the specification of the requirements and the rapid creation of prototype.The goal,the methodology,the general structure of the environment and two sub-systems are discussed.
Rapid prototyping in Maxillofacial Surgery and Traumatology
Rosa, Everton Luis Santos da;Oleskovicz, César Fernando;Arag?o, Bruno Nogueira;
Brazilian Dental Journal , 2004, DOI: 10.1590/S0103-64402004000300015
Abstract: review of the literature from 1991 to 2002 on the use of rapid prototyping in the biomedical area emphasizes the applicability of this technique to aid diagnosis and planning in maxillofacial surgery and traumatology. a case report in which a tmj ankylosis relapse was treated using rapid prototyping (selective laser sintering) for surgery planning is presented. after one year, the patient's buccal opening was 45 mm. transitory paralysis of the facial nerve disappeared totally in six months.
ADVANCEMENT OF RAPID PROTOTYPING IN AEROSPACE INDUSTRY -A REVIEW
Vineet Kumar Vashishtha,,Rahul Makade,,Neeraj Mehla
International Journal of Engineering Science and Technology , 2011,
Abstract: Rapid prototyping technology have emerged a new innovation to reduced the time cost of moulds fabrication by creating 3D product directly from computer aided design thus the designer is able to perform design validation and accuracy analysis easily in a virtual environment as if using a physical model. The primary aim of this paper is to give the reader an overview of the current state of the art in rapid prototyping technology .The paper also deal with feature’s of rapid prototyping in Aerospace industry and some of the existing problem’s of rapid rototyping.
Virtual Assembly Rapid Prototyping of Near Net Shapes
Lim, Theodore;Medellin, Hugo;Sung, Raymond;Ritchie, James;Corney, Jonathan;
Ingeniería mecánica, tecnología y desarrollo , 2009,
Abstract: virtual reality (vr) provides another dimension to many engineering applications. its immersive and interactive nature allows an intuitive approach to study both cognitive activities and performance evaluation. market competitiveness means having products meet form, fit and function quickly. rapid prototyping and manufacturing (rp&m) technologies are increasingly being applied to produce functional prototypes and the direct manufacturing of small components. despite its flexibility, these systems have common drawbacks such as slow build rates, a limited number of build axes (typically one) and the need for post processing. this paper presents a virtual assembly rapid prototyping (varp) project which involves evaluating cognitive activities in assembly tasks based on the adoption of immersive virtual reality along with a novel non-layered rapid prototyping for near net shape (nns) manufacturing of components. it is envisaged that this integrated project will facilitate a better understanding of design for manufacture and assembly by utilising equivalent scale digital and physical prototyping in one rapid prototyping system. the state of the art of the varp project is also presented in this paper.
Rapid prototyping for sling design optimization  [PDF]
Nermina Zaimovic-Uzunovic,Samir Lemes,Damir Curic,Alan Topcic
Computer Science , 2014,
Abstract: This paper deals with combination of two modern engineering methods in order to optimise the shape of a representative casting product. The product being analysed is a sling, which is used to attach pulling rope in timber transportation. The first step was 3D modelling and static stress/strain analysis using CAD/CAE software NX4. The slinger shape optimization was performed using Traction method, by means of software Optishape-TS. To define constraints for shape optimization, FEA software FEMAP was used. The mould pattern with optimized 3D shape was then prepared using Fused Deposition Modelling (FDM) Rapid prototyping method. The sling mass decreased by 20%, while signifficantly better stress distribution was achieved, with maximum stress 3.5 times less than initial value. The future researches should use 3D scanning technology in order to provide more accurate 3D model of initial part. Results of this research can be used by toolmakers in order to engage FEA/RP technology to design and manufacture lighter products with acceptable stress distribution.
DETERMINING THE INFLUENCE OF LAYER THICKNESS FOR RAPID PROTOTYPING WITH STEREOLITHOGRAPHY (SLA) PROCESS
Raju.B.S,,Chandrashekar.U,Drakshayani.D.N,Chockalingam.K
International Journal of Engineering Science and Technology , 2010,
Abstract: Stereolithography is a Rapid prototyping technique, which allows direct transformation of CAD files into epoxy resin parts for building the physical models, these are built from photo-curable thermosetting resins. Part quality in the Stereolithography process is a function of the build parameters such as hatch cure depth, layer thickness, orientation and hatch file. This paper attempts to identify and study the various process parameters governing thestereolithography system, specifically the influence of layer thickness related to the part characteristics. The part characteristics can be divided into part physical characteristics and mechanical characteristics. The part physical characteristics are surface finish, dimensional accuracy and distortion where as mechanical characteristics are flexural property, ultimate tensile strength and impact strength. Thus paper proposes to study the influence of the layer thickness (build parameters) over the part quality. The study is conducted on the test samples of SL 5530, which were built on SLA5000 machine, under different sets of process parameters and tested under ASTM specified test conditions. The results have been analyzed to achieve an optimal layer at which the mechanical properties are high with minimum dimensional instability, which is found to be 100 micron layer thickness. To obtain an optimallayer thickness for the SLA parts is the end result of the paper.
Rapid Prototyping of wax foundry models in an incremental process  [PDF]
B. Kozik,G. Budzik,T. Dziubek,M. Grzelka
Archives of Foundry Engineering , 2011,
Abstract: The paper presents an analysis incremental methods of creating wax founding models. There are two methods of Rapid Prototypingof wax models in an incremental process which are more and more often used in industrial practice and in scientific research.Applying Rapid Prototyping methods in the process of making casts allows for acceleration of work on preparing prototypes. It isespecially important in case of element having complicated shapes. The time of making a wax model depending on the size and the appliedRP method may vary from several to a few dozen hours.
How Rapid is Rapid Prototyping? Analysis of ESPADON Programme Results  [cached]
Brigitte Saget,Mark Thomas,Hans Schurer,Denis Aulagnier
EURASIP Journal on Advances in Signal Processing , 2003, DOI: 10.1155/s1687617203212129
Abstract: New methodologies, engineering processes, and support environments are beginning to emerge for embedded signal processing systems. The main objectives are to enable defence industry to field state-of-the-art products in less time and with lower costs, including retrofits and upgrades, based predominately on commercial off the shelf (COTS) components and the model-year concept. One of the cornerstones of the new methodologies is the concept of rapid prototyping. This is the ability to rapidly and seamlessly move from functional design to the architectural design to the implementation, through automatic code generation tools, onto real-time COTS test beds. In this paper, we try to quantify the term ¢ € rapid ¢ € and provide results, the metrics, from two independent benchmarks, a radar and sonar beamforming application subset. The metrics show that the rapid prototyping process may be sixteen times faster than a conventional process.
An Open Framework for Rapid Prototyping of Signal Processing Applications  [cached]
Maxime Pelcat,Jonathan Piat,Matthieu Wipliez,Slaheddine Aridhi
EURASIP Journal on Embedded Systems , 2009, DOI: 10.1155/2009/598529
Abstract: Embedded real-time applications in communication systems have significant timing constraints, thus requiring multiple computation units. Manually exploring the potential parallelism of an application deployed on multicore architectures is greatly time-consuming. This paper presents an open-source Eclipse-based framework which aims to facilitate the exploration and development processes in this context. The framework includes a generic graph editor (Graphiti), a graph transformation library (SDF4J) and an automatic mapper/scheduler tool with simulation and code generation capabilities (PREESM). The input of the framework is composed of a scenario description and two graphs, one graph describes an algorithm and the second graph describes an architecture. The rapid prototyping results of a 3GPP Long-Term Evolution (LTE) algorithm on a multicore digital signal processor illustrate both the features and the capabilities of this framework.
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