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Reprojeto de um dispositivo eletromecanico em uma abordagem de engenharia reversa integrada ao projeto para manufatura e montagem e à prototipagem rápida Redesign of an electromechanical device in a reverse engineering approach integrated to design for manufacturing and assembly and rapid prototyping  [cached]
Carlos Henrique Pereira Mello,Fabrício Oliveira de Toledo,Dóris Akemi Akagi,José Hamilton Chaves Gorgulho Júnior
Produ??o , 2011,
Abstract: O tema deste trabalho é o estudo da integra o do projeto para manufatura e montagem com a prototipagem rápida, em uma abordagem de engenharia reversa, como ferramenta de suporte ao reprojeto de produtos. A partir de uma fundamenta o teórica sobre esses conceitos, o presente trabalho visa analisar a aplica o de um modelo para a utiliza o integrada do projeto para manufatura com a prototipagem rápida em uma abordagem da engenharia reversa no processo de reprojeto de produtos eletromecanicos e analisar os resultados da aplica o do referido modelo para a redu o do tempo de produ o/montagem e dos custos de manufatura/montagem no reprojeto desse produto que está, há mais de 30 anos, no mercado. O método de pesquisa empregado foi a pesquisa-a o, uma vez que o pesquisador buscava resolver um problema identificado dentro do objeto de estudo em parceria com a equipe de profissionais da empresa. Os resultados das recomenda es para o reprojeto do produto apresentam uma redu o no tempo de montagem, do número de processos e de componentes e no custo-meta do produto, propiciando a oportunidade de melhorar a sua competitividade no mercado. The purpose of this work was the study of the integration between design for manufacturing and assembly with rapid prototyping, in a reverse engineering approach, such as some tools to support product redesign. Based on a literature review of these concepts, this paper aimed at examining the application of a model that integrates the design for manufacture and assembly with rapid prototyping in reverse engineering approach in the redesign of an electromechanical device. The objective was to analyze the results of the application of this model in order to reduce the time of manufacture/assembly and the cost of assembly in the redesign of the product, which has been marketed for more than 30 years. The research method employed was action-research, because the researcher wanted to address a problem identified within the object of study, in partnership with the company's research team. The results were recommendations for the redesigning of the product, which showed a reduction in the assembly time, in the number of processes and components, and also in the targeted cost of the product - providing the opportunity to improve the competitiveness of the company in the market.
Combination of Novel Virtual and Real Prototyping Methods in a Rapid Product Development Methodology / Kombinacija novih prividnih (virtualnih) i stvarnih postupaka proizvodnje prototipova i metodologija brzog razvoja proizvoda
Polimeri , 2012,
Abstract: The applicability of novel rapid prototyping methods and techniques for improving various stages of rapid product development is described in this study. In addition to the conventional prototyping, functional prototypes with various properties may be generated. Finite element simulations and novel experimental techniques are successfully used for improve the prototyping process both on a macroscopic and on a microscopic scale. The 2 component prototyping offers new options for 2k industrial component design and for biomodelling. / Ovaj rad opisuje primjenjivost novih postupaka brze proizvodnje prototipova i metoda za pobolj anje raznih stupnjeva brzog razvoja proizvoda. Osim konvencionalne proizvodnje prototipova mogu se na initi i funkcionalni prototipovi razli itih svojstava. Metode simuliranja s kona nim elementima i nove eksperimentalne metode uspje no se upotrebljavaju za pobolj anje proizvodnje prototipova na makroskopskoj i mikroskopskoj razini. Dvokomponentna proizvodnja prototipova nudi nove mogu nosti za 2k konstruiranje industrijskih dijelova i za biomodeliranje.
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.
Automated Tools for Rapid Prototyping
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 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.
Critical Parameters Effecting the Rapid Prototyping Surface Finish
Journal of Mechanical Engineering and Automation , 2011, DOI: 10.5923/j.jmea.20110101.03
Abstract: A component can be manufactured in several ways. Rapid Prototyping technique is one among the material adding manufacturing process, building up its unique potential in the present scenario. This technique helps manufacture a product from the basic design of the component, thus optimizing the iterative product development process time and creating geometrically complex parts to precise dimensions. In the Rapid Prototyping process, surface finish is critical as it can affect the part accuracy, reduce the post-processing costs and improve the functionality of the parts. This paper presents an experimental design technique for determining the optimal surface finish of a part built by varying Build Orientation, Layer Thickness and keeping other parameters constant using the Fused Deposition Modeling (FDM) process. The design investigates the effect of these parameters on the surface finish. Experiments were conducted using a fractional factorial design with two levels for Layer Thickness and three levels for Build Orientation factor. The results are statistically analyzed to determine the significant factors and their interactions. The significant factors, their interactions and the optimum settings are proposed.
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.
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.
Friction Induced Wear of Rapid Prototyping Generated Materials: A Review  [PDF]
A. Tsouknidas
Advances in Tribology , 2011, DOI: 10.1155/2011/746270
Abstract: Additive manufacturing has been introduced in the early 80s and has gained importance as a manufacturing process ever since. Even though the inception of the implicated processes predominantly focused on prototyping purposes, during the last years rapid prototyping (RP) has emerged as a key enabling technology for the fabrication of highly customized, functionally gradient materials. This paper reviews friction-related wear phenomena and the corresponding deterioration mechanisms of RP-generated components as well as the potential of improving the implicated materials' wear resistance without significantly altering the process itself. The paper briefly introduces the concept of RP technologies and the implicated materials, as a premises to the process-dependent wear progression of the generated components for various degeneration scenarios (dry sliding, fretting, etc.). 1. Introduction Rapid prototyping (RP) poses a promising alternative to conventional manufacturing techniques during concept evaluation, design optimization, rapid tooling, and lately for direct production of customer driven products. The comparative advantages of additive manufacturing are both cost and time related while RP facilitates the direct incorporation of functional characteristics into the final product. The basic concept of RP techniques relays on the conversion of 3D geometries, generated or processed by computer-aided design (CAD), into an STL file format. This is followed by the segmentation of the object in a series of overlaying layers, an essential step in the bottom-up approach of any additive manufacturing process. RP processes initiate with the construction of the objects’ base layer and progress upwards, with each layer being deposited/formed on top of the proceeding one, finally resulting in the desired 3D geometry. This approach circumvents limitations associated with conventional manufacturing methods, provides products with competitive strength characteristics, allows the fabrication of geometries of unequal complexity, while simplifying the incorporation of application specific features into the produced object [1]. Several industrial sectors (automotive, aerospace, and medical) have embraced, supported, and in some cases even dictated recent advances in RP, leading to customized, high added value products, whereas the implicated technologies can be easily extended to numerous other applications. Rapid prototyping technologies can be categorized into three main categories: solid based like fused deposition modeling (FDM), powder based as selective laser
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
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