Concurrent STEP-based assembly planning for prismatic products

Dissertant

Khalil, Asil Jamil

Thesis advisor

Ketan, Husayn Salim

University

University of Technology

Faculty

-

Department

Department of Production Engineering and Metallurgy

University Country

Iraq

Degree

Master

Degree Date

2012

English Abstract

Assembly planning is one of the important steps during product development.

Product data exchange and interfacing between different CAD/CAM systems are of great importance to the development of concurrent integrated design environments and computer integrated manufacturing systems.

This research introduces the concept of STEP (STandard for Exchange of Product model data) an ISO standard as a neutral format for exchange of CAD model data between different CAD/CAM systems and how STEP AP 203 data is stored and how the feature information can be extracted and recognized from STEP file, and presents the research effort on designing an assembly sequence planning system that allows the user to automatically generate an assembly sequence plan from STEP CAD file.

Different proposed algorithms are used in this research to achieve the CAD/CAAP integration.

This research work contains three main parts; the first part is to extract geometric data from STEP file.

STEP AP203 format of models is taken as the geometric data input and then recognition and extraction of parts form features will be done.

This problem was address by proposing an algorithm, which is considered an effective approach for recognition and extraction the form features for prismatic parts.

The proposed algorithm is based on the Attribute Adjacency Graph (AAG) and Attribute Adjacency Matrix (AAM).

The second part is recognition and extraction of assembly features, through using proposed algorithm based on matching form features and mating relations.

Assembly features have been exploited as the link between design and assembly planning.

The third part is to automate assembly planning tasks through generating assembly information which is represented by assembly sequence plans, and selecting the best assembly sequence plan.

The proposed methodology in this research has been completely implemented by designing an integrated system called STEP-based Assembly Sequence Planning (ST-ASP) system.

The (ST-ASP) system consists of three functional modules which include; design module, assembly features module, and assembly planning module.

The (ST-ASP) system is built by using Visual Basic 6.0 supported by Autodesk Mechanical Desktop 2009 package and implemented on (HP Pavilion dv6) PC.

The (ST-ASP) system is directed to 3D prismatic products.

The form features explored include; pocket (through and blind), slot, rib, step, rectangular boss, cylindrical boss and hole (through and blind), while mating relations include; against, fit, and insert.

The system has been tested to demonstrate the feasibility of the proposed methodology, where it generates 180 feasible assembly sequence plans for the tested case study.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-418849