A Flexible Solid 3D Model Reconstruction System for Mechanical CAD /CAM Systems (original) (raw)

3D Model Generation From the Engineering Drawing

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2010

The contribution deals with the transformation of engineering drawings in a paper form into a 3D computer representation. A 3D computer model can be further processed in CAD/CAM system, it can be modified, archived, and a technical drawing can be then generated from it as well. The transformation process from paper form to the data one is a complex and difficult one, particularly owing to the different types of drawings, forms of displayed objects and encountered errors and deviations from technical standards. The algorithm for 3D model generating from an orthogonal vector input representing a simplified technical drawing of the rotational part is described in this contribution. The algorithm was experimentally implemented as ObjectARX application in the AutoCAD system and the test sample as the representation of the rotational part was used for verificaton.

3D Solid Reconstruction from 2D Orthographic Views

2020

Three-dimensional computer-aided design (CAD) models are widely used by designers because of their useful applications in the areas of CAD/CAM/CAE/CAQ. A desirous trend to create this model, which has long been studied by scientists around the world, is a 3D model reconstruction from 2D orthographic views. With this method, it is easy to enter geometric information as well as use 2D drawings that have already existed. Most of the previous works used three views, but many of the mechanical parts needed only two views. An advanced 3D solid reconstruction system using only two orthographic views is the subject of this chapter. The proposed method has been implemented and verified reliability by an ObjectARX program plugged into AutoCAD 2018. The 3D models have been checked for their compatibility with 3D CAD/CAM systems. This chapter presents principles, algorithms, databases, programming for the advanced reconstruction system, and some of its technical applications.

Interactive 3D Reconstruction: New Opportunities for Getting CAD-ready Models

2015

A multitude of image-based 3D reconstruction and modeling techniques exist, which have achieved significant success in recent years. However, these techniques still lack certain abilities. For example, current 3D reconstruction techniques cannot decompose an object into its individual subparts. Thus, a printed model will consist of one single monolithic piece, which does not allow composing or decomposing parts, does not allow movable or flexible parts, and does not allow manufacturing the model from multiple different materials like wood, metal, or plastic. I reviewed the work in the research area of 3D reconstruction and provide an analysis of neglected research objectives and current drawbacks. Furthermore, I propose a mock-up of an interactive tool as a guideline for future research which describes a possible architecture, user interfaces, and processing pipeline, to overcome existing drawbacks of 3D reconstruction techniques.

Automated CAD Conversion with the

The Machine Drawing Understanding System (MDUS) is an experimental CAD conversion system aimed at realizing the entire process of understanding mechanical engineering drawings, from scanning to three-dimensional (3-D) reconstruction. This paper describes the structure, algorithms and current performance of MDUS. The modular structure of the system provides for further improvements and makes it an ideal workbench for researchers wishing to test their own algorithms and incorporate them into the system.

Three dimensional computer vision for computer aided design and manufacturing applications

Advances in Structural and Syntactical Pattern Recognition, 1996

Our work focuses on the problem of automatic generation of viewpoint invariant geometric surface models from range data to be used in CAD/CAM systems. We developed two methods for recovering the surface. First is on the base of Shape from Shading method and second is on the base of Facet method. A comparison between the results obtained using the 2 methods is made. We also offer new techniques for the representation and CNC processing of the surfaces.

Reconstruction of 3D Part Models for Flexible Technology Systems

Robotica & Management, 2018

The essay proposes to realize theoretical and experimental research in the field of three-dimensional scans, as well as in the field of reverse engineering to 3D printing. The idea of the theme has left the engineer responsible for different types of electrical / electronic equipment and has to recreate / rebuild CAD models for a number of parts of the equipment configuration, parts that fail after a certain operating time.

3D CAD Model Retrieval and its Application: A Review

International Journal of Analytical, Experimental and Finite Element Analysis, 2023

The use of this model is particularly important, especially in the aerospace, shipbuilding, automotive, and other fields that are producing more and more three dimensional CAD models, as most existing 3D model retrieval methods such as are based on multilevel extraction, 3D CAD model semantics. Existing model retrieval methods are limited to the retrieval between similar models,granularity as the foundation for retrieving similarities The majority of these methods begin by extracting 3D model features, compare similarity based on those attributes, and subsequently accomplish retrieval goals. applications for retrieving 3D CAD models are numerous. One crucial aspect of product development that must be addressed before product realisation is the retrieval process. Different assembly joint information (liaison), including geometric and non-geometric information, is required in order to choose the most appropriate joining procedure. An active tool must be used to capture, represent, and reuse this knowledge across domains in order for the effective selection of model retrieval to take place.The designer needs ontology-based information to analyse these multiple design requirements, functional requirements, and production requirements for the choice of joining technique. This article suggests some uses for 3D CAD model retrieval.

A New Method for Extracting 3D Solid Models of Objects Using 2D Technical Drawings

Mathematical and Computational Applications, 2007

In this study, a new method called "3D-Space" have been developed to obtain 3D models of prismatic machine parts using 2D technical drawings. The algorithm basicaly works in the following manner: 3 basic views (i.e. top, front, left side) of an object are supplied as inputs while the output is a 3D solid view of corresponding object. To start with a raw bounding box spatially big enough to contain the complete final object is taken. Following the operations executed on it, the result is the 3D solid view of the 2D drawings. The basic views of the object are used to determine the nature of the operation to be applied on the raw entity. A feedback mechanism is also incorporated into the system to check the correctness of the final product. The results show that in most of the cases the algorithm works as expected. However there are some restrictions which are given in the text.

A multiple-view CAD representation for product modelling

Shape Modeling International, 1997

With the advent of Concurrent Engineering (CE), the engineering product design process has c h g e d substantially. Different factors of the product life cycle, such as the manufacturing process, part assembly and quality control, can now all be simultaneously involved in the design phase. To achieve CE traditional Computer-Aided Design systems are inadequate. Cooperative product design needs more powerful modelling techniques and geometric representation schemes than those offered by actual commercial CAD systems. I n this paper a multiple-view CAD representation, called Intermediate Model, is presented. The Intermediate Model has been defined with the aim to upgrade a traditional CAD system to a feature-based modelling system which allows to represent different context dependent views of the product.