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Magnesium alloy rectangular box deep drawing numerical simulation of temperature and loading system design BHF

Author: JiangJiuGuang
Tutor: YuYanDong
School: Harbin University of Science and Technology
Course: Materials Processing Engineering
Keywords: AZ31B magnesium alloy Box-shaped pieces Warm deep drawing Numerical Simulation BHF loading system
CLC: TG386
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract


Magnesium alloy is the lightest structural metal, magnesium alloy not only has high specific strength and stiffness, and has good heat dissipation, electromagnetic shielding, damping properties and machining performance, and the product will be recycled. These features make magnesium alloys in the automotive, electronics, aerospace and other fields has been widely used. Therefore, box-shaped pieces of magnesium alloy forming magnesium alloy processing rules for practical and industrialization have important guiding significance. However, the magnesium alloy sheet at room temperature ductility is poor. Magnesium alloy is heated to a temperature in the thermoplastic deformed state, this state is rolled back continuously hardening process, somewhat offset by recrystallization, this time in a low magnesium alloy sheet strength, high ductility softened state, this state can be obtained good deep drawing properties. This paper AZ31B magnesium alloy rectangular box (rectangular and curved) of warm deep drawing process of the numerical simulation. Finite element analysis software Dynaform, simulated AZ31B magnesium alloy rectangular and curved piece deep drawing process. The arcuate rectangular magnesium alloy of a thickness distribution and forming has been analyzed, the results found punch punch corner region radius and a magnesium alloy deep drawing force and the deformation over Cheng Zhongcheng maximum area, and the straight edge Punches Rounded corners and straight edge punch than the circular edge portion and punch punch fillet corner region of greater force and deformation, this area is a sheet metal deep drawing process is the most prone to rupture defect area. By numerical simulation summed punch speed and friction coefficient on the impact of deep drawing process to determine the friction coefficient and drawing speed. BHF deep drawing is a very important process parameters, we propose a step-ladder and valley-type two kinds of variable blank holding force curve load simulation program to study the step-ladder Variable Blank Holder Force role of small moments BHF and small to large BHF BHF buffer time into the change of the impact of deep drawing, analyzes changes in peak-type BHF peak into the change of time the impact of deep drawing. That results in the formation and quality are more than a constant BHF get down deep molded parts. This article has been drawing die design, the design of the blank holder can be heated using heating rods so that the blank holder reaches a certain temperature, the heating rod tail successive temperature control device, and can be achieved through digital temperature controller heating temperature setting and control. Temperature reaches deep drawing purposes. In the simulation results of the two types of Variable Blank Holder Force optimal load curve after curve, for the corresponding variable blank holding force system research and design.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Cold stamping ( sheet metal processing) > Cold stamping process
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