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مقالات مستخرج از این رساله
1. Majid Lotfi Shahpar, Mohammad Meghdad Fallah, “Experimental and Numerical Study of Shaping Aluminum2024 and Steel304 Sheets Laminated with Laser Beam”
International Blind Peer Reviewed Journal, MAGNT RESEARCH REPORT, january,2015

Abstract

The process of forming by laser, in particular in recent years has been noticed broadly. In this process, with the radiation of laser ray over the sheet surface, which is accompanied by the creation of a fast sectional heating and following that, the cooling of the heated area, forming is performed. Though, the method of the emitted temperature distribution as a result of the laser beam radiation in a piece specifies the type of forming mechanism, but, the mechanism and method of the shape change of the sheet are different depending on the size of parameters affecting the process. In this connection, three mechanisms of temperature gradient, buckling and shortening have been introduced.In line with the objectives of this thesis, the study of the effect of different parameters on the bending angle has been predicted and studied. Then , the metal sheets bending by using the laser beam in form of thermal-mechanical couple in the soft ware of limited parts (ABAQUS) has been modeled and the simulation has been studied with the change of parameters such as diameter beam, beam pass speed , sheet thickness , laser power and the number of passes. The continuation of the performed researches has been in experimental form and based on the design of the presented test , five parameters ( laser power, the speed of laser beam pass, beam diameter, sheet thickness , number of passes) from the parameters effective on the process have been reviewed. Then in order to evaluate , the impact of laser power , the speed of laser beam pass and sheet thickness and the number of pass on the trend of bending angle increase have been studied ;using the diagrams and charts with the help of Design Expert software.The following study deals with the impact of pause time or cooling time period between the passes. The results of the studies showed that out of the mentioned variable, the number of passes and laser powers have direct relationship and the sheet thickness , beam diameter and scan speed have the reverse relationship with the bending final angle accordingly.

Key Words: Laser Forming Process , Forming Mechanisms , Effect of Process Parameters, Limited Element Method

ISLAMIC AZAD UNIVERSITY

JASB Branch

A Thesis Submitted in partial fulfillment of the requirements for the Degree of “M.Sc” in
Mechanical Engineering

Title
A Numerical and Experimental Study of the Aluminum Sheet Multi-Pass Laser Forming Process

Superviser:

Dr. Mohammad meghdad Fallah

By:

Majid Lotfi Shahpar

January 2015

1 Heat Affected Zone (H.A.Z.)
1 Temperature Gradient Mechanism (TGM)
1 Buckling Mechanism (BM)
1 Upsetting Mechanism (UM)
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