摘要

節(jié)能降耗、提高性能是現(xiàn)代機械努力發(fā)展的方向，鎂合金是最輕的商用金屬結(jié)構(gòu)材料，與現(xiàn)在市場上常用的鋼材和鋁合金相比，具有比重小、價格低、比強度高、阻尼減振性能突出等優(yōu)點。
鎂合金的加工方法也是多種多樣的，其中以鑄造、擠壓、鍛造為主。鑄造鎂合金有組織不致密、偏析、容易產(chǎn)生熱裂紋和氧化皮等缺點，不利于用于性能要求比較高的工件。通過擠壓、鍛造等工藝生產(chǎn)出的鎂合金產(chǎn)品，比鑄造材料具有更高的強度、更好的延展性、更多樣化的力學性能，可以滿足高強度結(jié)構(gòu)件的需求。
本課題以鎂合金擠壓－模鍛復(fù)合工藝為基礎(chǔ)，應(yīng)用數(shù)值模擬等手段，分析了鎂合金拉伸試樣在封閉模壓過程中的金屬流動情況，并根據(jù)模擬結(jié)果進行了模壓工藝和模具設(shè)計，然后進行了鎂合金拉伸試樣模壓成形，對模壓試樣進行了拉伸檢測，對比分析了AZ61鎂合金試樣鑄態(tài)、擠壓、擠壓-鍛造前后性能的變化。


關(guān)鍵詞：鎂合金,模具設(shè)計,數(shù)值模擬,拉伸實驗

















Abstract

Oil consumption reduction and performance enhancement have become the development trend of the machine. In comparison with most widely used aluminum alloys and steels, magnesium alloys are the lightest commercialized metallic material for structural applications. Mg alloys possess the attractive properties desired by a lot of machines, such as low density, low cost, higher specific strength, good casting properties, out-standing damping capability.
The manufacture process of Mg alloy is various, major represented by casting, extrusion and forging. The casting of Mg alloy has some defaults, such as the structure is sparse, partial divide easy to cause hot crack and cause oxidation peel, not suitable for the samples function which is strictly required. However, by extrusion and forging process to produce magnesium alloy products has more power and hardness than the casting materials, and it also has better scalability and more diversified mechanical properties to meet the more demand of the structure.
Subject to the Mg alloy extrusion - forging complex process based on numerical simulation, and other means of a magnesium alloy tensile specimen in a closed molding process in the flow of metal, and in accordance with the results of the simulation process and die design molded And then proceed to the tensile specimens molded magnesium alloy forming, molding a tensile test specimen, comparative analysis of the sample of magnesium alloy AZ61-cast, squeeze, squeeze - forging performance before and after the change.




Key words: magnesium alloy, die design，numerical simulation，tensile test







目 錄

中文摘要 .Ⅰ
英文摘要 Ⅱ
1緒論 1
1.1 引言 1
1.2 鎂合金的優(yōu)點 1
1.3 鎂合金的應(yīng)用 3
1.4 鎂合金塑性成形技術(shù)現(xiàn)狀及發(fā)展趨勢 4
1.4.1鎂合金擠壓與軋制技術(shù) 4
1.4.2 鎂合金熱鍛成形技術(shù) 4
1.5 本課題研究的主要內(nèi)容和目的 5
2 數(shù)值模擬 6
2.1 引言 6
2.2 Deform簡介 7
2.3 DEFORM的功能 7
2.4 數(shù)值模擬過程 8
2.5 模擬結(jié)果及分析 9
3拉伸試樣模具設(shè)計與制造 13
3.1工藝對比 13
3.2 坯料的設(shè)計及生產(chǎn) 14
3.3 鍛件圖的設(shè)計 15
3.4 模具設(shè)計 16
3.4.1 計算各部分的工藝參數(shù) 16
3.4.2 毛坯在模具中的位置 17
3.4.3 凹模的設(shè)計 17
3.4.4 模具總體設(shè)計及UG模型 18
3.4.5 加熱裝置的設(shè)置 21
3.4.6 選擇噸位裝備 22
4 拉伸實驗 23
4.1 序言 23
4.2 實驗材料及方法 23
4.1.1 實驗材料 23
4.1.2 實驗設(shè)備 23
4.3 斷裂的基本概念及分類 24
4.4 實驗結(jié)果及分析 25
5 結(jié)論 29
致 謝 30
參考文獻 31