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COB119 PROBLEMAS NA INTEGRAÇÃO DE SISTEMAS CAD/CAE/CAM NO PROCESSO DE INJEÇÃO DE PLÁSTICO/ SYSTEMS INTEGRATION PROBLEMS ON CAD/CAE/CAM IN THE PLASTIC INJECTION PROCESS

Carla Cristina Amodio Estorilio & Kazuo Hatakeyama

Departamento de Pós-graduação em Tecnologia/PPGTE, Núcleo de Pesquisa em Engenharia Simultânea/NUPES, Centro Federal de Educação Tecnológica do Paraná - CEFET/PR

CEP 80230-910 Curitiba - PR , Brasil - E-mail amodio@nupes.cefetpr.br - E-mail kazuo@nupes.cefetpr.br

Permanently changing markets situations require quick and flexible reactions on the part of companies. This calls for new strategies and new manufacturing philosophies. At the same time, however, these characteristics of flexibility and innovation increased the complexity of managing work processes.

This paper reviews important aspects of the evaluation of technological innovation. It presents the systems evaluation CAD/CAE/CAM that can be used in order to access the degree of technological innovation for any given project.

This computational tools with; Computer Aided Engineering (CAE), numerical simulations and computational tools are incorporated in the productive process through the establishment of a multidisciplinary environment (concurrent engineering) with adequate task management.

Keywords: new strategies, new manufacturing philosophies, concurrent engineering, Computer Aided Engineering (CAE), numerical simulations, computational tools. / novas estratégias, nova filosofia de manufatura, engenharia simultânea, simulação numérica, ferramentas computacionais.

COB124 DESENVOLVIMENTO DE UM BANCO DE DADOS DE TOLERÂNCIAS VISANDO A INTEGRAÇÃO COM UM SISTEMA "CAD" / DEVELOPMENT OF A TOLERANCE DATABASE TO BE INTEGRATED TO A CAD SYSTEM

Nilson L. Maziero, João Carlos E. Ferreira & Everton Gubert

Universidade Federal de Santa Catarina, Departamento de Engenharia Mecânica, GRUCON

Caixa Postal 476, 88040-900, Florianópolis, SC - E-mail: jcf@grucon.ufsc.br

This paper decribes a methodology used for organizing and maintaining a tolerance database, and its integration to a CAD system. The information search can be carried out by the user either through the CAD system or independently, and he/she has the following options : (i) from examples of couplings applications, (ii) from the specification of fit and precision of the coupling; and (iii) as a function of the specific components. The retrieved information can be automatically transferred to the graphical representation of the CAD software.

Keywords: Tolerâncias, CAD/CAM, Projeto para a Manufatura e Montagem / Tolerances, CAD/CAM, Design for Manufacturing and Assembly

COB359 DETERMINAÇÃO AUTOMÁTICA DOS PARÂMETROS DE USINAGEM E GERAÇÃO DO PROGRAMA NC NUM SISTEMA CAD/CAPP/CAM / AUTOMATIC DETERMINATION OF MACHINING PARAMETERS AND NC PROGRAM GENERATION IN A CAD/CAPP/CAM SYSTEM

João Carlos E. Ferreira, César R. K. Stradiotto & Adilson U. Butzke

Universidade Federal de Santa Catarina, Departamento de Engenharia Mecânica, GRUCON

Caixa Postal 476, 88040-900, Florianópolis, SC - E-mail: jcf@grucon.ufsc.br

Described within this paper is a technique for determining the optimum machining parameters for turned components modeled in a CAD/CAPP/CAM system. This technique considers initially the area of good chip control, given by a pair of values of feed and depth of cut, which is usually found in catalogs of tool manufacturers. Then, the restrictions for machining, such as cutting forces, clamping rigidity and spindle power are considered within the area of good chip control. The pair which leads to the minimum machining cost is selected as the optimum machining parameters. Finally, the NC program for machining the given part is generated through a commercial CAM software.

Keywords: CAM, Parâmetros de Usinagem, Otimização, CAPP, "Features"/CAM, Machining Parameters, Optimization, CAPP, Features

COB379 simpronc - simulador de programas nc: edição e simulação gráfica/SIMPRONC - nc PROGRAM SIMULATOR: EDITION AND GRAPHIC SIMULATION

Alberto José Álvares, Fabricio Rossi Fernandes Lima

GRACO - Grupo de Automação e Controle, Departamento de Engenharia Mecânica, Faculdade de Tecnologia, Universidade de Brasília, CEP 70.910-900, Brasília, Brasil., alvares@enm.unb.br, fabricio@enm.unb.br,

This work presents a simulation system of NC program developed in GRACO. The simulator is called SIMPRONC and is composite of routines of program edition, graphics simulation and report forms. The simulation is executed on screen and the draw can be printed. Some data of process planning can be found in the report forms, like cutting speed, rpm, time elapsed and tools changes.

Keywords: 1- CNC, 2- Graphic Simulation, 3- CAD/CAM, 4- G Code, 5- NC Program, 1- CNC, 2- Simulação Gráfica,

3- CAD/CAM, 4- Código G, 5- Programa NC

COB473 A CAD System to Conceptual Phase of Design

Cristiano Machado & Franco G. Dedini

Departamento de Engenharia Mecânica, Faculdade de Engenharia Mecânica - Unicamp - Campinas, CEP 13083-970 Campinas, Brasil - E-mail: juca@fem.unicamp.br

This work is concerned about the conception of computer programs to aid the process of mechanical design. Today it urges the development of systems that works further than the traditional areas dedicated by CAD systems (Computer Aided Design) that are the area of draft. CAD systems must aid in the conceptual phase of design. This paper presents the development of a software system as a solution to this problem in design field. This program uses design methodologies that are presented in literature. It was developed in visual object oriented language, and it was split into 3 modules with tasks of: design process management, requirements determination and conception development. This system is directed towards educational application, working as a auxiliary tool in undergraduated courses in mechanical design field.

Keywords: Conceptual Phase of Design, Product Design, Computer Aided Design, Expert Systems

COB547 IMPLEMENTAÇÃO DE UM SISTEMA COMPUTACIONAL PARA OTIMIZAÇÃO DO CORTE DE RETÂNGULOS / implementation of a computational system for the rectangles cutting optimization

Raimundo Ricardo Matos da Cunha & Altamir Dias

Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina - UFSC

CEP: 88040-900 - Florianópolis - SC - Brasil, E-mail: ricardo@emc.ufsc.br, altamir@emc.ufsc.br, dias@vt.edu

This work presents a proposal of procedure to solve the optimization problem involved in unidimensional and bidimensional cutting of rectangle pieces from large stocks. It tries to define one algorithmic structure of an interface where the definition and solution of cutting pattern can be reached and applied to the production line.

Keywords: CAD & CAM, Computational System, Cutting Stock Problem, Optimization, Encaixe, Otimização, Problema da Ordenação de Cortes, Sistema Computacional

COB569 2D DIMENSION-DRIVEN DESIGN SYSTEM BASED ON THE HISTORY OF OPERATION EXECUTION USING AN ATMS SYSTEM

Fábio Kawaoka Takase & Marcos de Sales Guerra Tsuzuki

Escola Politécnica da Universidade de São Paulo, Departamento de Engenharia Mecânica/Mecatrônica

Av. Prof. Mello Moraes, 2231, CEP:05508-900, São Paulo, SP, Brasil, E-mail: fktakase@usp.br mtsuzuki@usp.br

In this paper we present a 2D parametric CAD system that uses the execution history of geometric modelling operations and the dependency among these operations to provide the system the capability of obtaining an solution even when the set of geometric constraints is not complete. This can be achieved using the implicit information that are present in drawings as default values. The execution history of operations gives the precedence order of values to the system, which is an essential information to decide whether or not to replace a chosen value. The system stores information about the dependencies among the executed operations in an Assumption-based Truth Maintenance System (ATMS) avoiding problems with cyclic dependencies and allowing the visualisation of model modifications due to operations changes. In the first section an overview of different approaches to the dimension-driven design is given and after that basic concepts and the system description is presented.

Keywords: computer-aided design, parametric CAD, dimension-driven design, geometric constraints, truth maintenance systems

COB570 Modelador de Sólidos CSG Paramétrico Utilizando Dimensões Relativas / Parametric CSG Solid Modeler using relative dimensions

Marcos de Sales Guerra Tsuzuki

Departamento de Engenharia Mecânica/Mecatrônica, Escola Politécnica da USP

CEP 05.508-900 São Paulo, Brasil - E-mail: mtsuzuki@usp.br

A complex solid, according to a CSG representation, is represented by a combination of several primitive solids. When a complex solid is created, it is necessary to apply transformations - translations and rotations - for positioning the solids such that the desired configuration will be obtained. It is possible to modify this solid modifying the value of a primitive solid’s dimension. However, the transformations used for positioning will be maintained constant. In this work we will propose a parametric representation based on relative dimensions for representing the positioning transformations. We will define relative dimensions and an algorithm to validate the relative dimensions will be presented. We will present some relative dimension’s properties that will allow the definition of some heuristics for the solution searching in the parametric problem.

Keywords: Parametric CAD, Solid Modeling, CSG, Dimension Representation, Assembling.

COB573 SISTEMAS CAD/CAM APLICADOS ENTRE DIFERENTES FORNECEDORES / CAD/CAM SYSTEM IN DIFFERENT SUPPLIERS

Claudemir Gimenez & Geraldo Nonato Telles

Departamento de Engenharia de Materiais, Faculdade de Engenharia Mecânica - UNICAMP

13.083-970, Campinas, SP, Brasil, E-mail: {claude, geraldo1}@fem.unicamp.br

Traditionally the western companies buy its components, parts, and so on in a lot of suppliers. These suppliers are based in the same country which companies or no. In recent years the global sourcing concept have been discussed like a great innovation against the traditional supplier concept. During last years, "keiratsu", the Japanese concept has been discussed. The suppliers are organized in hierarchy in "keiratsu" concept. The new Brazilian VW truck and bus factory allow that the suppliers work within the company. Of a total 1,400 workers when the factory reaches full speed, just 200 will be VW employees. This article study data interchange in traditional and new VW system and propose the use of STEP (STandard for the Exchange of Product data model) and Simultaneous Engineering.

Keywords: STEP, CAD/CAM, Global Sourcing, Suppliers, Simultaneous Engineering / STEP, CAD/CAM, Fornecimento Global, Fornecedores, Engenharia Simultânea.

COB584 INDICADORES DO GRAU DE AUTOMAÇÃO DA MANUFATURA / AUTOMATION MANUFACTURING FOREFINGERS

Rogério Monteiro & Geraldo Nonato Telles

UNICAMP Faculdade de Engenharia Mecânica FEM - Departamento de Engenharia de Materiais, DEMA campus UNICAMP CP 6051 CEP 13083-970 Campinas - SP - Brasil, E-mail: monteiro@fem.unicamp.br

The large technologic advance permitted at the enterprises to use recourses more developed strategies increasing the flow velocity in Manufacturing Systems. Nowadays, factories are gaining a profile very flexible,.with capacity to produce greater variety of products as in little quantity, because the enterprise improves it`s agility. We observe increase competition too, in the international market where small competition advantages are fundamental to insure the organization survive. This increase competition together with fast changes environment requiring the businessman to get the maxim information about process and as all organization. Actually, grow the interest by indicators capable to show the level of organization of enterprise, the degree of automation of activity and the level of flexibility the manufacturing systems. The objective this article is present various models of automation and to compare their characteristics and applicability in real environment.

Keywords: Manufacturing Flexible Systems, Indicators of Automation, Flexibility, Productivity.

Sistemas Flexíveis de Manufatura, Indicadores de Automação, Flexibilidade, Produtividade.

COB603 APLICAÇÃO DE UM SISTEMA CAD PARA GERAÇÃO E SIMULAÇÃO DE PROGRAMAS PARA FRESADORAS CNC / CAD SYSTEM GENERATION AND SIMULATION FOR CNC MILLING MACHINE PROGRAM

Alexandre Dias da Silva, Fábio Manuel Sá Simões, Fábio Ferreira Guimarães & Alonso Andrade de Paula

Departamento de Engenharia Mecânica, Universidade Federal de Uberlândia - UFU

CEP38400-902 Uberlândia -MG ;E-mail: fmssimoes@ufu.br ; adiass@ufu.br

This work presents the development of a system that racionalizes the program generation for CNC Milling Machine, being capable of simulating the cutting process. The interface consist basicaly of routines elaborated with Autolisp language, utilizing a very popular CAD platform (Autocad). It is possible to integrate the project phase of a product with the automatic generation of the program for the machine in a single environment. By simulating the relative movement between the part and the cutting tool, it is possible to have a 3D visualization of generation of the projected elements solid model before its manufacturing.

Keywords: Integração CAD/CAM; Máquinas CNC; Usinagem; Simulação 3D / CAD/CAM Integration; CNC Machine; Machining; 3D Simulation

COB1040 GERAÇÃO DE SEQÜÊNCIAS DE USINAGEM A PARTIR DE GEOMETRIAS CRIADAS EM CAD / TOOL PATH GENERATION FROM GEOMETRIES CREATED IN CAD

Leandro Costa de Oliveira, Álvaro Michellotti, Élvio Lima & Rodrigo Pivetta

Depto. de Fabricação e Projeto de Máquinas, Centro de Tecnologia, Universidade Federal de Santa Maria

CEP 97105-900 Santa Maria - RS, Brasil - E-mail: leandro@inf.ufsm.br

With the purpose optimizing programming of Computer Numerical Controlled lathes, the development of a system for automatic generation of CNC programs based in CAD/CAM concept was performed. Thus, the software AutoCAD was chosen on account of its extensive use in industry and academics. In this software, using AutoLISP language, its was developped a routine that selects entities in the drawing that determines the contour to be executed, was realized. Next, the same routine saves the data of selected entities in DXF format. Starting from this data, another program, implemented in Turbo Pascal, analyses the drawing geometry and produces the CNC program automatically. In this step are distinguished two types of pieces treated in different forms for two algorithms: the growing-geometry pieces and the diverse-geometry pieces. After generation of programs, they are verificated in a simulator for later use in the lathe. In this work, two examples are presented in details, verificated in a simulator and tested in lathe EMCO Compact 5 CNC, of NAFA - CT, UFSM. The results obtained prove the eficiency of system in the face of proposed problem.

Keywords: CAD/CAM, Programação CNC, Usinagem CNC / CAD/CAM, CNC Programation, CNC Machining