鎂合金封閉模壓技術(shù)研究



摘    要

鎂合金是實(shí)際應(yīng)用中最輕的結(jié)構(gòu)金屬材料，具有較高的比剛度、比強(qiáng)度、良

好的電磁屏蔽性、減振性能和散熱性能，在航空航天、汽車工業(yè)和3C產(chǎn)品領(lǐng)域

具有廣泛的應(yīng)用前景。

    本文對鎂合金的特點(diǎn)及其擠壓、鍛造工藝方面做了簡要的介紹，以汽車轉(zhuǎn)向控制臂為對象，在鎂合金拉伸實(shí)驗(yàn)結(jié)果的基礎(chǔ)上，利用有限元數(shù)值模擬仿真軟件DEFORM-3D進(jìn)行AZ61鎂合金封閉模壓的數(shù)值模擬，通過設(shè)置相應(yīng)的模具溫度、模具下壓速度、坯料溫度等參數(shù)，從模擬的結(jié)果中，分析AZ61鎂合金在模壓過程中的金屬變形和流動情況、充填情況、材料破壞情況、以及應(yīng)力應(yīng)變分布情況，為鎂合金汽車轉(zhuǎn)向控制臂后續(xù)封閉模壓成形工藝和模具設(shè)計(jì)作準(zhǔn)備。




關(guān)鍵字：鎂合金，擠壓，模鍛，數(shù)值模擬,應(yīng)力應(yīng)變


 


ABSTRACT


Magnesium alloy is the lightest structural metallic material in the practical application. Due to it’s specific stiffness，specific strength，better electromagnetic shielding，damping performance and heat dissipation，it has a broad application prospect in the aerospace, automotive products and the 3 C areas.

The paper briefly introduced the characteristics of magnesium alloy , magnesium alloy extrusion forming and forging process ,choosing the Steering Control Arm as the object,on the base of results of the magnesium alloy tensile test, using the finite element numerical simulation soft ---DEFORM-3D , simulates the  closed molding processes of AZ61alloy. By setting a corresponding parameters ,such as the temperature of the die，the speed of the up die movement, the temperature of blank and so on. From the simulation results, analysis deformation and flow, filling, the damage of material, and the distribution of stress and strain of magnesium alloy AZ61,make the preparation for forming car steering control arm in a closed mold and designing the mold.




Keywords:  magnesium alloys, extrusion, die forging, numerical simulation, Stress and strain




目   錄


中文摘要 Ⅰ

ABSTRACT Ⅱ

1緒論 1

  1.1 引言 1

  1.2 鎂合金 1

1.3 鎂合金的塑性加工 2

1.4 鎂合金的應(yīng)用和發(fā)展 2

    1.4.1  汽車工業(yè) 3

1.4.2  3C領(lǐng)域 4

1.4.3  其他領(lǐng)域 4

 1.5論文主要研究內(nèi)容 5

 2鎂合金擠壓 6

 2.1擠壓設(shè)備與工藝 6

 2.2擠壓工藝 6

 2.3鎂合金擠壓制品組織的不均勻性 7

 2.4鎂合金擠壓制品的力學(xué)性能 7

 3鎂合金的模鍛 8

 3.1鎂合金的可鍛性 8

 3.2鎂合金鍛造的特點(diǎn) 9

 3.2.1對應(yīng)變速率敏感 9

3.2.2流動性差 9

3.2.3鍛造溫度范圍窄 9

3.2.4加熱過程中容易產(chǎn)生合金軟化 9

3.2.5導(dǎo)熱性 10

3.3鎂合金鍛造工藝 10

3.3.1鍛造方式 10

3.3.2鎂合金等溫鍛造工藝特點(diǎn) 11

3.4AZ61型號鎂合金拉伸試驗(yàn)數(shù)據(jù) 12

4轉(zhuǎn)向控制臂的數(shù)值模擬 13

4.1DEFORM 13

4.1.1 DEFORM的特點(diǎn) 13

4.2 DEFORM-3D的模塊結(jié)構(gòu) 14

4.2.1前處理 14

4.2.2求解器 14

4.2.3后處理器 14

4.3轉(zhuǎn)向控制臂模擬過程 15

4.4鍛造模擬的前處理 17

4.4.1輸入對象數(shù)據(jù) 17

4.4.2輸入模具 18

4.4.3設(shè)置物體的溫度 18

4.4.4設(shè)置模具的運(yùn)動 18

4.4.5模擬控制設(shè)定 18

4.4.6對象間關(guān)系的設(shè)定 19

4.5鍛壓模擬后分析 19

5結(jié)論 24

參考文獻(xiàn) 25

致謝 26