STEP-Based CAD CAPP CAM integration for product development system

Dissertant

al-Hadithi, Amjad Barzan Abd al-Ghafur

Thesis advisor

Ketan, Husayn Salim

University

University of Technology

Faculty

-

Department

Department of Production Engineering and Metallurgy

University Country

Iraq

Degree

Ph.D.

Degree Date

2010

English Abstract

The key to the success of the e-manufacturing is a seamless data flow in the CAD / CAPP / CAM integration, although CAD, CAPP and CAM technology has advanced greatly, the links between these systems are still weak and a gap exists between the integration systems.

Many integrated systems have been presented to solve CAD / CAPP / CAM integration problems, but the problems have not been fully solved yet.

Therefore, the main goal of the research has been to develop an integrated environment aims to integrate CAD, CAPP, and CAM systems based on STEP / STEP-NC standards across the whole product cycle.

More specifically to generate STEP-NC file to represent product data in form of neutral file by which data exchange and sharing can be realized in the integrated system to cover the information needed.

To solve the problems and realize the goals, a proposed methodology presented in this research involves design and development of CAD / CAPP / CAM integrated environment established according to STEP / STEP-NC standards, which provide a framework of collaborative product development and meet the data requirements for product information model that includes product and process data through standards STEP, AP203, AP224 and AP238.

In order to overcome the CAD / CAPP integration problem, a STEP based feature modeling is used to accomplish this task.

The research contributes to developing hybrid features modeling approach which combines the feature recognition and feature based design.

Developing of STEP-based feature modeling has been considered as design tool through developing 3D modeling environment based on (B-rep and CSG) technologies to represent 3D model design in any CAD environment in the STEP graphic standard.

The feature recognition algorithm is developed through data extracted from STEP AP203 stores in B-rep format and based on Edge-Loop approach to recognize the features for prismatic parts.

A STEP-based feature modeling presents high level 3D solid features which are used as the basic entities for prismatic design parts based on STEP AP224, providing a standard for manufacturing feature representations.

An object-oriented approach is used in developing the STEP based feature modeling and exporting the part design as a STEP AP224 Part21 data format as an application of CAM.

The proposed methodology in this research has been completely implemented by design and development of integrated system called STEP Feature Based Process Planning (ST-FBPP) system.

The ST-FBPP system consists of five functional modules which include; a features recognizer, a feature-based modeler, a process planner, tool path planner and a part program generator.

The ST-FBPP system implementation contributes to generating a digital process plan according to STEP-NC data model as output STEP Part21 file.

The whole ST-FBPP system is developed by using Visual C++ 6.0, and operated in Windows XP 3.0 on PC.

For handling STEP files, CAD system used for geometry processing solid modeling is CATIA software.

ST-Developer 12.0 software provides the integrated development tools related to STEP standards.

Moreover the EXPRESS complier and ROSE / C++ library are used in the developing and implementing of the ST-FBPP system.

This research work done by using ST-FBPP system is limited to prismatic parts and associated 2.5-axis milling and drilling operations.

Machining features explored in the research include ; pocket, slot, step, and hole features.

Finally, ST-FBPP system has been tested to carry out a case study to demonstrate the feasibility of the proposed methodology framework and the applicability of the developed system.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Data processing

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-304984