Electromagnetic Forming Process (EMF) is advanced high velocity metal forming process which deals with the application of high energy magnetic surge for very short duration of time in order to attain desired deformation. In this work, simulation of EMF process for tube bulging is performed and experimental validation is carried out. For simulation, COMSOL Multiphysics software is used. Simulation is performed for two material, aluminium 6063-O and copper. The results of simulation are validated by experiments on aluminum tube.
Table of Contents
1 INTRODUCTION
1.1 Introduction
1.2 Working
1.3 Advantages
1.4 Disadvantages
1.5 Objectives
1.6 Methodology
2 LITERATURE REVIEW
2.1 Literature Review
2.2 Physics Governing EMF Process
3 MODELLING AND SIMULATION
3.1 Software Used for Simulation
3.2 Material Selection
3.3 Coil
3.4 Process Parameters
3.5 Response Variable
3.6 Simulation of Experiments
4 EXPERIMENTAL WORK, RESULTS AND ANALYSIS
4.1 Machine Selection
4.2 Experimental Results
4.3 Analysis of Results
4.4 Confirmatory Experiments
4.5 Additional Experiments
5 CONCLUSIONS
Objectives and Topics
This dissertation aims to conduct a performance analysis of the Electromagnetic Forming (EMF) process, specifically for tube bulging applications. The primary research goal is to investigate how various process parameters influence the deformation of aluminium alloy tubes through a combination of numerical simulation and experimental validation.
- Investigation of the Electromagnetic Forming (EMF) process physics.
- Numerical simulation of tube bulging using COMSOL Multiphysics.
- Experimental validation of simulation results using an industrial EMF machine.
- Statistical analysis of process parameters including discharge energy, stand-off distance, and workpiece thickness.
Excerpt from the Book
1.2 Working
Electromagnetic forming (EMF) is an impulse or high-speed forming technology, which uses pulsed magnetic fields to apply forces to tubular or sheet metal workpieces, made of a material of high electrical conductivity. The force application is contact free and no working medium is required [1]. The process starts when a capacitor bank is discharged through a coil. The transient electric current which flows through the coil generates a time-varying magnetic field around it. By Faraday’s law of induction, the time-varying magnetic field induces electric currents in any nearby conductive material. According to Lenz’s law, these induced currents flow in the opposite direction of the primary currents in the coil. Then, by Ampere’s force law, a repulsive force arises between the coil and the conductive material. If this repulsive force is strong enough to stress the work piece beyond its yield point, then it can shape it with the help of a die or a mandrel [5].
In an EMF process, the material can achieve velocities in the order of 100 m/s in less than 0.1ms. The dynamics of this event, including die impact, enhance the formability of the work piece and reduce springback. Thus, EMF is expected to help overcome some formability barriers that prevent more widespread use of materials such as Aluminium in light weight structural applications [6].
Summary of Chapters
1 INTRODUCTION: This chapter provides an overview of metal forming, the distinction between traditional and non-traditional methods, and defines the working principles and objectives of the Electromagnetic Forming process.
2 LITERATURE REVIEW: This chapter explores previous academic research regarding the EMF process and details the fundamental physical equations governing the electromagnetic interactions.
3 MODELLING AND SIMULATION: This chapter covers the simulation approach, including software selection, material choices, coil design, and the application of Finite Element Method (FEM) to predict deformation behavior.
4 EXPERIMENTAL WORK, RESULTS AND ANALYSIS: This chapter details the experimental setup, validation of simulation results, statistical analysis using ANOVA, and the outcomes of confirmatory and additional experiments.
5 CONCLUSIONS: This chapter synthesizes the findings from the research, confirming the significance of discharge energy and stand-off distance in the EMF process.
Keywords
EMF, Electromagnetic Forming, COMSOL, Taguchi Method, Lorentz Force, Tube Bulging, Aluminium 6063, Discharge Energy, Stand-off distance, Springback, Finite Element Method, ANOVA, High Velocity Forming, Magnetic Field, Material Deformation.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the performance analysis of the Electromagnetic Forming (EMF) process, specifically investigating its effectiveness for tube bulging applications.
What are the primary parameters studied in this dissertation?
The study evaluates three main process parameters: discharge energy, stand-off distance (the gap between the coil and the workpiece), and the thickness of the workpiece.
What is the ultimate goal of the work?
The primary goal is to establish a correlation between process parameters and the resulting deformation of the tube, validated through both COMSOL simulations and physical experiments.
Which scientific methodology is employed?
The study employs a design of experiments (DOE) approach using the Taguchi Method and L8 orthogonal arrays to structure simulation and experimental trials, followed by ANOVA for statistical significance analysis.
What does the main body of the text cover?
The main body covers the theoretical physics of EMF, the development of a coupled electromagnetic-structural model in COMSOL, the experimental validation process, and the analysis of results obtained from the aluminium tube samples.
Which key terminology defines this work?
Key terms include Electromagnetic Forming (EMF), Lorentz Force, High Energy Rate Forming (HERF), COMSOL Multiphysics, and Analysis of Variance (ANOVA).
How does the author treat the simulation of the EMF process?
The author treats the EMF process as a multiphysics phenomenon, utilizing COMSOL to couple transient magnetic field solutions with solid mechanics to calculate the resulting material deformation.
What findings were made regarding the significance of thickness?
The study concludes that while discharge energy and stand-off distance have a highly significant effect on deformation, workpiece thickness is not a significant parameter within the range tested.
What happened during the additional experiments?
Additional experiments aimed to find the breakage limits of the tubes; it was observed that tubes could burst or develop cracks when the applied energy exceeded their material endurance limits.
- Citar trabajo
- Ronak Khandelwal (Autor), Prof. Dr. Uday A. Dabade (Autor), 2014, Performance Analysis of Electromagnetic Forming Process, Múnich, GRIN Verlag, https://www.grin.com/document/305740
