scholarly journals Computer-Aided Design of Traditional Jigs and Fixtures

2021 ◽  
Vol 12 (1) ◽  
pp. 3
Author(s):  
Abdullah D. Ibrahim ◽  
Hussein M. A. Hussein ◽  
Ibrahim Ahmed ◽  
Emad Abouel Nasr ◽  
Ali Kamrani ◽  
...  
Keyword(s):  
Programming Language ◽  
Computer Aided Design ◽  
Feature Recognition ◽  
Visual Basic ◽  
Modern Technology ◽  
Heuristic Rules ◽  
Computer Aided ◽  
Jigs And Fixtures ◽  
Cylindrical Parts ◽  
Aided Design

Conventional design of jigs and fixtures has become unsuitable given the requirements of modern technology and complexity and diversity in the production with the rapid update of products. Computer-aided design (CAD) of jigs and fixtures is an effective solution in this direction. The current paper focuses on a computer-aided design of the traditional jigs and fixtures and developed a system containing tailor-made software, created using the Visual Basic programming language and installed on it the viewer screen to show the part. The developed system has been built by connecting Visual Basic programming language to the SolidWorks software on which the part is drawn and saved as STEP AP-203 file format, and the system reads and extracts the data from the STEP AP-203 file. Heuristic rules of feature recognition are pre-prepared for checking the extracted geometric data and deciding which data shape will represent the machining feature; then, the system provides the optimum design of the traditional jigs and fixtures for a group of hollow cylindrical parts that contain a group of cross-holes on the cylinder body, whether perpendicular or offset from the cylinder’s axis, (inclined or inclined offset, or blind or through, by applying pre-prepared heuristic rules for the design of traditional jigs and fixtures.

An oriented feature extraction and recognition approach for concave-convex mixed interacting features in cast-then-machined parts

2018 ◽  
Vol 233 (4) ◽  
pp. 1269-1288 ◽  
Author(s):  
Haichao Wang ◽  
Jie Zhang ◽  
Xiaolong Zhang ◽  
Changwei Ren ◽  
Xiaoxi Wang ◽  
...  
Keyword(s):  
Feature Extraction ◽  
Computer Aided Design ◽  
Feature Recognition ◽  
Freeform Surface ◽  
Layer By Layer ◽  
Computer Aided Process Planning ◽  
Computer Aided ◽  
Machined Parts ◽  
Aided Design ◽  
Interacting Features

Feature recognition is an important technology of computer-aided design/computer-aided engineering/computer-aided process planning/computer-aided manufacturing integration in cast-then-machined part manufacturing. Graph-based approach is one of the most popular feature recognition methods; however, it cannot still solve concave-convex mixed interacting feature recognition problem, which is a common problem in feature recognition of cast-then-machined parts. In this study, an oriented feature extraction and recognition approach is proposed for concave-convex mixed interacting features. The method first extracts predefined features directionally according to the rules generated from attributed adjacency graphs–based feature library and peels off them from part model layer by layer. Sub-features in an interacting feature are associated via hints and organized as a feature tree. The time cost is reduced to less than [Formula: see text] by eliminating subgraph isomorphism and matching operations. Oriented feature extraction and recognition approach recognizes non-freeform-surface features directionally regardless of the part structure. Hence, its application scope can be extended to multiple kinds of non-freeform-surface parts by customizing. Based on our findings, implementations on prismatic, plate, fork, axlebox, linkage, and cast-then-machined parts prove that the proposed approach is applicable on non-freeform-surface parts and effectively recognize concave-convex mixed interacting feature in various mechanical parts.

Autogenerating/Drawing Valid Arrays and Contracted Graphs With Pentagonal Links for Type Synthesis of Mechanism by Computer Aided Design

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Yi Lu ◽  
Hui Huang ◽  
Yang Lu ◽  
Nijia Ye
Keyword(s):  
Computer Aided Design ◽  
Visual Basic ◽  
Type Synthesis ◽  
Computer Aided ◽  
Aided Design ◽  
New Criteria ◽  
Synthesis Of Mechanism

A method for autogeneration/draw of valid arrays and contracted graphs by cad is studied in this paper. First, the concepts and relative new criteria of arrays and contracted graphs (CGs) are explained for the representation/generation of the CGs and the identification of the isomorphic/invalid CGs using the arrays. Second, a software is created in Visual Basic for automatically generating the arrays of the CGs with pentagonal links, identifying the isomorphic/invalid arrays, generating the valid arrays, and automatically drawing their CGs. Third, the interface of the software and the main functions of the compiled programs are explained. Finally, some examples are given to illustrate this software and method.

Microstructure Feature Recognition for Materials Using Surfacelet-Based Methods for Computer-Aided Design-Material Integration

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Namin Jeong ◽  
David W. Rosen
Keyword(s):  
Computer Aided Design ◽  
Feature Recognition ◽  
Computational Method ◽  
Geometric Features ◽  
Material Microstructure ◽  
Control Material ◽  
Computer Aided ◽  
Aided Design ◽  
And Control ◽  
Material Information

With the material processing freedoms of additive manufacturing (AM), the ability to characterize and control material microstructures is essential if part designers are to properly design parts. To integrate material information into Computer-aided design (CAD) systems, geometric features of material microstructure must be recognized and represented, which is the focus of this paper. Linear microstructure features, such as fibers or grain boundaries, can be found computationally from microstructure images using surfacelet based methods, which include the Radon or Radon-like transform followed by a wavelet transform. By finding peaks in the transform results, linear features can be recognized and characterized by length, orientation, and position. The challenge is that often a feature will be imprecisely represented in the transformed parameter space. In this paper, we demonstrate surfacelet-based methods to recognize microstructure features in parts fabricated by AM. We will provide an explicit computational method to recognize and to quantify linear geometric features from an image.

A CAD Mapping Study Based on a VB Blasting Crater

2011 ◽  
Vol 99-100 ◽  
pp. 195-198
Author(s):  
Hong Xing Liu ◽  
Qun Ying Fu ◽  
Zhi Qiang Meng
Keyword(s):  
Computer Aided Design ◽  
Rock Type ◽  
Visual Basic ◽  
Mapping Method ◽  
Minimum Amount ◽  
Charge Weight ◽  
Mapping Study ◽  
Computer Aided ◽  
Aided Design

Charge weight is an important consideration when calculating for the blasting crater. The main parameters affecting the blasting crater are the rock type, minimum amount of chemicals consumed, and resistance lines. Although only a few parameters influence the blasting crater, calculating and speadsheeting require a large amount of work and furnish results that are not intuitive. Moreover, the calculation of blasting crater parameters takes time. The current study calculated the parameters using Visual Basic to illustrate a fast spreadsheeting and mapping method using Computer-Aided Design, the design for the charge until the supporting role.

Feature modeling using a grammar representation approach

2005 ◽  
Vol 19 (4) ◽  
pp. 245-259 ◽  
Author(s):  
E. OSTROSI ◽  
M. FERNEY
Keyword(s):  
Computer Aided Design ◽  
Feature Recognition ◽  
Logical Structure ◽  
Feature Modeling ◽  
Second Phase ◽  
Third Phase ◽  
Computer Aided ◽  
Feature Based ◽  
Aided Design ◽  
Intelligent Computer

In intelligent computer-aided design the concept of intelligence is related to that of integration. Using feature-based computer-aided design models is thought to make a complete integration. This paper presents a feature recognition approach based on the use of a feature grammar. Given the complexity of feature recognition in interactions, the basic idea of the approach is to find the latent and logical structure of features in interaction. The approach includes five main phases. The first phase, called regioning, identifies the potential zones for the birth of features. The second phase, called virtual extension, builds links and virtual faces. The third phase, called structuring, transforms the region into a structure compatible with the structure of the features represented by the feature grammar. The fourth phase, called Identification, identifies the features in these zones. The fifth phase, called modeling, represents the model by features. The feature modeling system software is developed based on this approach.

scholarly journals Integration of Computer Aided Design and Manufacturing at Second Year level in Undergraduate Program

2011 ◽  
Author(s):  
Christopher Laing ◽  
Subramaniam Balakrishnan
Keyword(s):  
Real World ◽  
Computer Aided Design ◽  
Mechanical Design ◽  
Learning Experience ◽  
Modern Technology ◽  
Numerical Control ◽  
Computer Aided ◽  
Production Stages ◽  
Second Year ◽  
Aided Design

Computer Graphics for Mechanical and Manufacturing Engineering at the University of Manitoba has evolved from a generic first year program to a second year design course that simulates real world experience through the development of a team based project. This challenging and comprehensive program integrates two separate course into one, CAD (Computer Aided Design) and Computer Aided Manufacturing (CAM) Concepts. The latter provides a framework to the process of computer-controlled manufacturing with an emphasis on use of advanced computerized machines. The CAD portion is taught in three stages; the first stage builds proficiency in 3D modeling techniques to create working virtual models. The second stage focuses on the language and communication of mechanical design, and the third stage develops practical skills on a host of modern technology, including CNC (Computer Numerical Control) and rapid prototyping equipment. The second part provides a series of lectures establishing the link between CAD and CAM and culminates in a design project that links the two modules. These complementary programs work hand in hand to provide the necessary theory and practical skill for the students to work in teams, to develop and conclude the term with a working device that they designed, fabricated and tested in one of the two production laboratories allocated to this course. At the conclusion of this program, each device is authenticated to ensure that it has met the criterion which validates both the design as well as the student’s learning experience. This paper will endeavour to be candid in sharing our experiences with you. We will cover everything from looking at the history behind this program, to the challenges we met. Most notably, the number of students compared to the equipment available in both the learning and production stages of this course. We will also explore the principals and thinking that constituted the curriculum with the goal that each facet of learning, both in its theory and application directly relates to real world practice that would contribute to the student’s field of study and their preparation for industry.

Sign in / Sign up

Export Citation Format

Share Document