Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Sheet metal forming"”.
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Combined method for die compensation in sheet metal forming
Sheet metal forming is one of the prominent methods to convert blank sheet material into a product. In sheet metal forming, proper allowance of its tools must be given to the elastic recovery, due to the nature of elastic property which is called springback. When stamped sheet components are …
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Evaluation of a variable-configuration-die sheet metal forming machine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Cycle-to-cycle control of reconfigurable die sheet metal forming
… addresses cycle to cycle control as applied to a sheet metal stretch forming process. More specifically, it attempts to validate the use of cycle to cycle (CtC) control for a multiple input-multiple output process. The work presented in this thesis attempts to answer some basic manufacturing …
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Spatial frequency based closed-loop control of sheet metal forming
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Sequential setup mechanism design for a reconfiguarable sheet metal forming die
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Analytical and numerical prediction of localized necking in sheet metal forming processes
… tools that can accurately predict failure in sheet metal forming operations. The strain-based forming limit curve (FLC) is one of the tools to predict the maximum permissible strains of thin metallic sheets which are loaded in the plane of the sheet to different states of stress. It may be …
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Tooling design for three-dimensional sheet metal forming using finite element analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Design and control of a flexible process for three-dimensional sheet metal forming
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Design of an automated variable configuration die and press for sheet metal forming
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Design and control of forming parameters for sheet metal forming using finite element analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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The Impact of Process Substitution on Manufacturing Costs: A Comparative Analysis of Sheet Metal Forming versus Extruded Steel Cutting
Sheet metal manufacturers continuously seek methods to enhance automation and reduce costs. This thesis explores process substitution and design standardization through a parameter-driven cost model and case studies applying Design for Manufacturability & Assembly (DFMA) principles. Specifically, …
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An Assessment of in-Service Stress Relaxation of a Work-Hardened Aluminum-Magnesium Alloy
… flow. In order to predict the typical industrial forming and in-service response of sheet metal, such as sheet metal forming and subsequent springback or relaxation, a general model---the Mix model, is proposed. The new model keeps the basic frame of the Modified Hart's model and introduces the …
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Finite element assisted prediction of ductile fracture in sheet bulging of magnesium alloys
… have tried shaping these alloys using various forming techniques. These studies have shown however, that the formability of these alloys is very difficult to predict. The material properties of magnesium alloys would suggest that they are ideal for sheet metal forming, yet their formability is …
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Numerical simulation of recrystallization behaviour of A1-1Mg during multi-pass rolling
… a large role in the performance of subsequent forming processes, such as deep-drawing and sheet-metal forming. It is becoming increasingly important to control these microstructural changes in order to optimise the subsequent processing route and thereby produce a cost-effective product. The …
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Experimental study of applying grooves on semi-tubular blank sheet metal using incremental sheet forming.
Incremental sheet forming (ISF) was a flexible sheet metal forming process which utilized a variety of forming tools, materials, and dies. ISF was implemented to develop a series of column covers which visually replicated the style of Doric columns. They were produced experimentally out of …
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Analytical model development and experimental investigation of process model size effects in microforming
… investigated. This is significant because sheet metal forming processes such as bending and extrusion are ideal fabrication techniques for mass production of parts at very competitive unit costs.</p>
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An investigation of the measurement, fixturing, and trimming of large sheet metal parts
Stretchformed sheet metal part production offers many challenges in process improvement such as increasing flexibility and part accuracy while decreasing cost and cycle time. The Reconfigurable Tooling for Flexible Fabrication (RTFF) project addresses these issues. This thesis investigates the …
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Experimental investigation and constitutive modeling of metallic honeycombs in sandwich structures
… in crashworthiness applications. Thin sandwich sheets also hold a promise for widespread use in automotive industry because standard sheet metal forming technology could be used to produce double-curvature sandwich shell structures. The crashworthiness and formability of sandwich structures are …
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Making More Cars with Less Metal
Reducing sheet metal yield losses in automotive manufacturing would reduce material demand, providing environmental and financial benefits. This thesis explores material efficiency from four perspectives: 1. The opportunity for improvement: A part by part analysis of yield losses for every sheet …
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