Three-Dimensional Kernel Development With Parasolid for Integral Sheet Metal Design With Higher Order Bifurcations

2009 ◽  
Author(s):  
Thomas Rollmann ◽  
Anselm Schu¨le ◽  
Reiner Anderl ◽  
Youssef Chahadi
Keyword(s):  
Product Design ◽  
Programming Languages ◽  
Sheet Metal ◽  
Three Dimensional ◽  
3D Models ◽  
Higher Order ◽  
Boundary Representation ◽  
Generation Process ◽  
3D Cad ◽  
Metal Design

The technology of linear flow splitting to produce bifurcated sheet metal structures is researched by the collaborative research center 666 since 2005. So far the product design process is supported by 3D-CAD models on the basis of User-Defined-Features in standard 3D-CAD systems. This paper now presents a new approach for generating 3D-models of integral sheet metal design products with higher order bifurcations based on a low-level 3D-kernel. The emphasis is placed on two aspects, namely the processing of the model’s topology and geometry as well as the software implementation. First, a methodology for the generation and manipulation of the geometry and topology of the Boundary Representation (B-Rep) structure is proposed. This methodology is integrated into an algorithm-based product design approach, which enables engineers to plan and design their complete draft for bifurcated sheet metal parts in an automated, computer aided way. Further functionalities to support the subsequent manufacturing process are developed and integrated. The idea is then implemented by developing a 3D-CAD application using the B-Rep CAD-kernel Parasolid. The programming framework. NET has been chosen for the development of the software on a Windows NT platform using the object-oriented C++ and C# programming languages. The work presented here has significant implications on the quality, accurateness and efficiency of the product generation process of sheet metal products with higher order bifurcations.

Collaborative Design System for Electromechanical Products

1996 ◽  
Author(s):  
Noboru Narikawa ◽  
Kazuo Takahashi
Keyword(s):  
Collaborative Design ◽  
Three Dimensional ◽  
3D Models ◽  
Information Management System ◽  
Design System ◽  
3D Cad ◽  
Cad System ◽  
Essential Components ◽  
Electromechanical Products

Abstract This paper gives an overview of a collaborative design system (CDS) for electromechanical products. To reduce design costs and to manufacture high-quality products, it is well known that concurrent engineering (CE) is a very efficient approach. Three-dimensional (3D) CAD system and engineering database system are essential components of CE. The CDS is an environment to realize CE. By creating 3D models in a computer and performing some simulations such as mechanical, electronic, software simulation and integrated simulations, it is possible to estimate functions, assemblability, manufacturability and so on, before making prototype models. In this paper, we outline the CDS and mainly discuss the total information management system (TIMS) which makes an important role of the CDS. This paper describes the implementation experience of some functions of the TIMS.

METHDOS OF EFFECTIVE DESIGN FOR CREATING OF PARAMETRIC 3D-MODELS OF PRODUCTS USING THE INTERNAL CAPABILITIES OF CAD-PROGRAMS

2020 ◽  
Author(s):  
E. A. Petrakova
Keyword(s):  
Programming Languages ◽  
3D Model ◽  
Three Dimensional ◽  
3D Models ◽  
Parametric Modeling ◽  
Effective Control ◽  
Model Parameters ◽  
Internal Capabilities ◽  
Program Components ◽  
Effective Design

It is known that the development of a three-dimensional parametric model is a creative process, since the same 3D-model can be built in various ways. In the article the methods for effective design of parametric 3D-models with the help of internal capabilities of CAD-program without the use of programming languages (macros) is developed. Using the methods and recommendations discussed in the article on the example of Autodesk Inventor functionality will allow the engineer to design parametric three-dimensional products in CAD-programs in the most rational way, reducing the number of errors. Recommendations for effective control of 3D-model parameters during creating of Assembly parts and 2D-drawings are given. Using the functionality discussed in the article will be useful for engineers using parametric modeling methods to create typical products, optimization and analysis of structures, development of their own database of standard products that are not in the library of CAD-program components.

scholarly journals CALS Technologies in Mechanical Engineering Using the Example of Developing Three-Dimensional Models of Typical Products

2020 ◽  
Vol 26 (4) ◽  
pp. 637-649
Author(s):  
A. A. Popova ◽  
◽  
I. N. Shubin ◽  
R. E. Aliev ◽  
◽  
...  
Keyword(s):  
Complex Structure ◽  
Three Dimensional ◽  
3D Models ◽  
Machine Building ◽  
The Body ◽  
Body Parts ◽  
3D Cad ◽  
Cad System ◽  
Dimensional Models ◽  
Three Dimensional Models

Three-dimensional models of the body parts were developed using the basic 3D modeling operations (rotation, extrusion, threading, etc.) of the T-FLEX CAD 3D CAD system, which made it possible to significantly simplify the work with assembly 3D models representing a complex structure consisting of a large number of parts. During the trial operation, the advantages of using the T-FLEX CAD 3D CAD system have been proven when working with complex 3D models. The advantages of using the program in the machine-building cluster are shown.

An Algorithm for Similar 3D Model Difference Examination Using Geometric Matching

2018 ◽  
Author(s):  
Yue Yin ◽  
Lianshui Guo
Keyword(s):  
3D Models ◽  
Boundary Representation ◽  
Similarity Coefficients ◽  
Optimal Matching ◽  
3D Cad ◽  
Geometric Matching ◽  
Type Area ◽  
Wide Range ◽  
Attribute Information ◽  
Surface Similarity

In this paper, a new algorithm for similar 3D CAD model difference examination based on geometric matching is presented. Firstly, using the boundary representation (B-rep) method, the two 3D models are decomposed into two sets of surfaces, each with an attributed adjacency graph (AAG) which is established using adjacency relationship of corresponding surfaces. The vertices of the AAG are set as the geometric information about surfaces (i.e. surface type, area). The edges of the AAG present the adjacency between surfaces, and the attribute information (i.e. the type and length of edges, the angle between two adjacent surfaces) is also stored in the AAG. Secondly, the surface similarity between two models is calculated according to their types, areas, composition edges and topological relationships. At the same time, the similarity matrix which stores the surface similarity coefficients is generated to find the geometric and topological optimal matching surfaces. Then, in the AAG, with the corresponding vertices of the optimal matching surface pair as the center, the remaining surfaces of two models are quickly and optimally matched according to the topological connections and similarity coefficients while the unmatchable ones are defined as added or deleted surfaces. Finally, differences between the two models are evaluated by analyzing and comparing the geometric attribute information about the matched surfaces. In order to validate the effectiveness and feasibility of the proposed algorithm, a software prototype for similar model difference examination has been developed. The effectiveness and feasibility of the algorithm have been verified by engineering applications through the industrial needs. The results show that this algorithm can effectively compare the differences among different design iterations and demonstrate its potentials for a wide range of engineering design iterations examination problems.

A Virtual Engineering System for Electromechanical Products

1995 ◽  
Author(s):  
N. Narikawa ◽  
T. Kuroiwa ◽  
T. Fujinuma ◽  
S. Sekimoto
Keyword(s):  
Three Dimensional ◽  
3D Models ◽  
Database System ◽  
Engineering System ◽  
3D Cad ◽  
Cad System ◽  
Virtual Engineering ◽  
Engineering Database ◽  
Essential Components ◽  
Electromechanical Products

Abstract This paper gives an overview of virtual enginecring (VE) system for electromechanical products. To reduce design costs and to manufacture high-quality products, it is well known that concurrent engineering (CE) is very efficient approach. Three-dimensional (3D) CAD system and engineering database system are essential components of CE. VE system is an environment to realize CE. By creating 3D models in a computer and performing some simulations such as mechanical, electronic, software simulation and integrated simulations, it is possible to estimate functions, assemblability, manufacturability and so on, without making prototype models. In this paper, we outline the VE system and mainly discuss the engineering database system which makes an important role of the VE system. This system is developed by applying the object oriented technology.

Triangular Mesh and Boundary Representation Combined Approach for 3D CAD Lightweight Representation for Collaborative Product Development

2018 ◽  
Vol 19 (1) ◽  
Author(s):  
Cong Hong Phong Nguyen ◽  
Young Choi
Keyword(s):  
Product Development ◽  
Computer Aided Design ◽  
Large Scale ◽  
Three Dimensional ◽  
Original Data ◽  
Triangular Mesh ◽  
Boundary Representation ◽  
Collaborative Product Development ◽  
3D Cad ◽  
Cad Models

The lightweight representation of three-dimensional computer-aided design (3D CAD) models has drawn much attention from researchers as its usefulness in collaborative product development is vast. Existing approaches are mostly based on feature depression or mesh-based simplification. In this article, a new approach for 3D CAD lightweight representation based on combining triangular mesh representation and boundary representation (B-rep) is proposed. The corresponding data structure as well as the conversion method from original data given in B-rep was developed. Considered as an essential application in collaborative product development, a case study on the visualization process of large-scale assembly models represented in the proposed lightweight representation was also conducted. The validation of the approach was performed via experiments with 3D CAD models in SAT format and by benchmarking with the conventional all-faceted approach with the same level of mesh resolution.

scholarly journals A Graphics Processor Unit-Accelerated Freeform Surface Offsetting Method for High-Resolution Subtractive Three-Dimensional Printing (Machining)

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Mohammad M. Hossain ◽  
Chandra Nath ◽  
Thomas M. Tucker ◽  
Richard W. Vuduc ◽  
Thomas R. Kurfess
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Boundary Representation ◽  
Numerical Control ◽  
Freeform Surface ◽  
Generation Process ◽  
Graphics Processor ◽  
Computer Aided ◽  
Processor Unit ◽  
Graphics Processor Unit

Machining is one of the major manufacturing methods having very wide applications in industries. Unlike layer-by-layer additive three-dimensional (3D) printing technology, the lack of an easy and intuitive programmability in conventional toolpath planning approach in machining leads to significantly higher manufacturing cost for direct computer numerical control (CNC)-based prototyping (i.e., subtractive 3D printing). In standard computer-aided manufacturing (CAM) packages, general use of B-rep (boundary representation) and non-uniform rational basis spline (NURBS)-based representations of the computer-aided design (CAD) interfaces make core computations of tool trajectories generation process, such as surface offsetting, difficult. In this work, the problem of efficient generation of freeform surface offsets is addressed with a novel volumetric (voxel) representation. It presents an image filter-based offsetting algorithm, which leverages the parallel computing engines on modern graphics processor unit (GPU). The compact voxel data representation and the proposed computational acceleration on GPU together are capable to process voxel offsetting at four-fold higher resolution in interactive CAM application. Additionally, in order to further accelerate the offset computation, the problem of offsetting with a large distance is decomposed into successive offsetting using smaller distances. The performance trade-offs between accuracy and computation time of the offset algorithms are thoroughly analyzed. The developed GPU implementation of the offsetting algorithm is found to be robust in computation, and demonstrates a 50-fold speedup on single graphics card (NVIDIA GTX780Ti) relative to prior best-performing algorithms developed for multicores central processing units (CPU). The proposed offsetting approach has been validated for a variety of complex parts produced on different multi-axis CNC machine tools including turning, milling, and compound turning-milling.

scholarly journals Machining feature recognition based on deep neural networks to support tight integration with 3D CAD systems

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Changmo Yeo ◽  
Byung Chul Kim ◽  
Sanguk Cheon ◽  
Jinwon Lee ◽  
Duhwan Mun
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Deep Learning ◽  
Deep Neural Network ◽  
3D Models ◽  
Boundary Representation ◽  
Machining Features ◽  
3D Cad ◽  
Machining Feature ◽  
Tight Integration

AbstractRecently, studies applying deep learning technology to recognize the machining feature of three-dimensional (3D) computer-aided design (CAD) models are increasing. Since the direct utilization of boundary representation (B-rep) models as input data for neural networks in terms of data structure is difficult, B-rep models are generally converted into a voxel, mesh, or point cloud model and used as inputs for neural networks for the application of 3D models to deep learning. However, the model’s resolution decreases during the format conversion of 3D models, causing the loss of some features or difficulties in identifying areas of the converted model corresponding to a specific face of the B-rep model. To solve these problems, this study proposes a method enabling tight integration of a 3D CAD system with a deep neural network using feature descriptors as inputs to neural networks for recognizing machining features. Feature descriptor denotes an explicit representation of the main property items of a face. We constructed 2236 data to train and evaluate the deep neural network. Of these, 1430 were used for training the deep neural network, and 358 were used for validation. And 448 were used to evaluate the performance of the trained deep neural network. In addition, we conducted an experiment to recognize a total of 17 types (16 types of machining features and a non-feature) from the B-rep model, and the types for all 75 test cases were successfully recognized.

PML in Application: An Example of Integral Sheet Metal Design With Higher Order Bifurcations

2008 ◽  
Author(s):  
Reiner Anderl ◽  
Jochen Raßler ◽  
Thomas Rollmann ◽  
Zhenyu Wu
Keyword(s):  
Product Development ◽  
Sheet Metal ◽  
Process Modeling ◽  
Object Oriented ◽  
Higher Order ◽  
Modeling Languages ◽  
Product Modeling ◽  
Complex Product ◽  
Development Processes ◽  
Metal Design

Processes are very important for the success within many business fields. They define the proper application of methods, technologies, tools, and company structures in order to reach business goals. Not only manufacturing processes have to be defined from the start point to their end, also other processes like product development processes need a proper description to gain success. For example in automotive industries complex product development processes are necessary and defined prior to product development. Over the last decades several product modeling languages have been developed moving to object oriented modeling languages, such as UML, but the used process modeling languages are still procedural. The paradigm shift caused by object oriented description within product modeling languages has to be transferred to process modeling languages. This paper describes an object oriented approach for process modeling, referred to as PML and its application to a complex product development and production process for integrated sheet metal design of higher order bifurcations. Using UML as a starting point an object oriented process modeling method is differentiated. The basic concepts which are needed for process modeling are put into an object oriented context and are explained. The paper gives an outlook, what can be achieved by the new approach.

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