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Investigation on Large Height-Diameter Ratio Cylindrical Cup Forming Process by Hydrodynamic Deep Drawing Based on FEA

Author: LiGuan
Tutor: LiuXiaoJing
School: Harbin University of Science and Technology
Course: Materials Processing Engineering
Keywords: Numerical Simulation Repeatedly drawing Radial pressure hydraulic drawing Forming Limit
CLC: TG394
Type: Master's thesis
Year: 2010
Downloads: 51
Quote: 0
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Abstract


With the lightweight needs of the automotive , aviation, aerospace parts , aluminum-magnesium alloys, titanium and other light alloys sheet has been widely used. However, the low light alloy such as aluminum-magnesium alloy sheet of plastic , poor formability , especially the traditional processing methods for forming large diameter than the parts , is difficult to achieve a deep drawing . This article describes the sheet metal forming numerical simulation of the basic theory of elastic-plastic constitutive equation , and sheet simulation used Barlat yield criterion and Hill yield criterion . Power display solution process of the algorithm and integral stability conditions have been discussed , for the sheet metal forming numerical simulation studies provide strong theoretical foundation . Low ductility for the aluminum-magnesium alloy , etc. , the need of large height to diameter ratio sheet metal forming analysis by finite element method ( Finite Element Analysis ) , the the explicit analysis software ETA/Dynaform5.5 large nonlinear dynamic to the cylindrical part the forming limit the research focus of of 5A06 aluminum-magnesium alloy barrel with several deep drawing numerical simulation , and analysis the cylindrical pieces repeatedly drawing of a typical plastic deformation law as well as wrinkling and rupture defective control method , and the impact of the tube shaped pieces repeatedly pull deep formability process parameters to explore , so as to achieve great height to diameter ratio forming of aluminum-magnesium alloy barrel with important guidance . Large height to diameter ratio of aluminum-magnesium alloy sheet forming needs , this paper presents a drawing forming new method , namely the radial load the hydraulic drawing techniques . Numerical simulation method , the final shape of the part of the wall thickness distribution for the assessment standards , to discuss the chamber pressure load curve and radial pressure loading path changes on the part formability . The mold parameters , the plate performance parameters of the forming quality . The simulation results show that : the reasonable match of the liquid chamber load path and radial load path , not only enough to control the rupture and deformation , uniform thickness changes in the distribution of parts , improve sheet affixed to the mold and stereotypes ; and be able to effectively reduce forming process , significantly increase the height to diameter ratio of the aluminum-magnesium alloy flat-bottomed cylindrical pieces forming limit .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > High-energy forming > High-pressure liquid molding
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