压铸模具设计毕业论文 - 图文(8)

辽宁工程技术大学毕业设计（论文）

在样品表面如图泡:(一)液态压铸;(b)SSM1-1;(c)SSM2-6

Fig.10样品的微观结构从液态压铸(a)和(b半固态压铸件)

Fig.11微观结构在不同位置的代表样本:(一)点;(b)b点;(c)c点;(d)d点

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刘冠男：螺杆套压铸模具设计

4总结

1) 使用气体引起的半固态工艺 生产半固态ADC12

2) 增加固态粒度的泥浆和孔隙度的收缩可以减少零件缺陷。 3) 好的半固态压铸铸件需要合适的柱塞速度和固体分数浆。 4) 铸造零件制作样品的微观结构是全国统一的。

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辽宁工程技术大学毕业设计（论文）

参考文献

[1] 坎贝尔j .铸造[M]。牛津:Butterwort-Heinemann,1991:1 85。

[2] 郑J,王建民问,赵P,吴c .优化工艺参数的高压压铸用人工神经网络[J]。先进制造技术,2009年,674年44:667。

[3]VERRAN G O, MENDESB P K, ROSSIC M A. 影响注塑参数对缺陷的形成Al12Si13Cu压铸合金:实验结果和数值仿真[J]。材料加工技术,2006年,179:190。

[4] HANGAI Y, KITAHARA S. 定量评价孔隙率的铝合金压铸件用分形分析区域的空间分布[J]。材料和设计,2009年,30:1169 1173。

[5]KIRKWOOD D H, SUERY M, KAPPANOR P, ATKINSON H V,YOUNG K P. 半固态加工合金[M]。纽约:施普林格,2009。

[6] FLEMING M C.金属合金半固态的行为[J]。冶金交易,1991年,22:957 981。

[7] FAN Z, FANG X, JI S. 组织和性能的rheo-diecast(RDC)铝合金[J]。材料科学与工程,2005,412,298。 [8] HONG C P, KIM J M. 开发先进流变过程及其应用[J]。固态现象,2006年,116/117:44 53。 [9] UBE Industries Ltd. 方法与装置塑造半固态金属:EPO 745694 A1[P]。1996年12 04。

[10] JORSTAD J, THIEMAN M, KAMM R. SLC: 最新的和最经济的方法来半固态金属(SSM)铸造[C]/ /第七届国际会议的半固态合金及复合材料加工。日本筑波,2002:701。

[11] YURKO J A, MARTINEZ R A, FLEMING M C. 半固态金属流变的发展过程(SSR)[C]/ /第七届国际会议的合金半固态加工和复合材料,日本筑波,2002:701。

[12] WANNASIN J, JUNUDOM S, TATTANOCHAIKUL T, FLEMING M C. 气体引起的发展过程的半固态金属铝压铸应用[J]。固态现象,2008 [13] TIANA C, LAMB J, van der TOUWC J, MURRAYA M, YAOD J Y,

GRAHAMD D, JOHND D S T. 融化的影响清洁形成的孔隙度缺陷汽车铝高压压铸件[J]。杂志的材料加工技术,2002年,122:82。

[14] ZHAO H D, WANG F, LI Y Y, XIA W. 实验和数值分析的气体在板ADC12诱捕缺陷[J].压铸件。材料加工技术,2009年,209:4537。 [15]

WANNASIN J, CANYOOK R, BURAPA R, FLEMING M C.

评估铝压铸件在流变过程中的固体部分 [16]

MARTINEZ R A, FLEMING M C. 进化的粒子形态在半固态加工[J]。冶金材料交易一,2005

年,36:2205 2210。

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刘冠男：螺杆套压铸模具设计

附录C 外文文献

Feasibility of semi-solid die casting of ADC12 aluminum alloy S. JANUDOM1, T. RATTANOCHAIKUL1, R. BURAPA2, S. WISUTMETHANGOON3, J. WANNASIN1 1. Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University, Hat

Yai, Songkhla, 90112, Thailand; 2. Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology

Srivijaya, Songkhla, 90000, Thailand; 3. Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai,

Songkhla, 90112, Thailand

Received 13 May 2010; accepted 25 June 2010

Abstract The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated are gas and shrinkage porosity. In the experiments, semi-solid slurry was prepared by the gas-induced semi-solid (GISS) technique. Then, the slurry was transferred to the shot sleeve and injected into the die. The die and shot sleeve temperatures were kept at 180 °C and 250 °C, respectively. The results show that the samples produced by the GISS die casting give little porosity, no blister and uniform microstructure. From all the results, it can be concluded that the GISS process is feasible to apply in the ADC12 aluminum die casting process. In addition, the GISS process can give improved properties such as decreased porosity and increased microstructure uniformity. Key words: ADC12 aluminum alloys; semi-solid die casting; gas induced semi-solid (GISS); rheocasting

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辽宁工程技术大学毕业设计（论文）

1 Introduction

For many years aluminum parts have been used in several applications such as automotive, electronic, aerospace, and construction fields. These parts are generally produced in a large quantity by the high pressure die casting process. Several advantages of die casting process have been realized such as high production rate and the ability to form small complex parts. The die casting process involves the injection of liquid aluminum into a die cavity under high pressures. The metal stream “sprays” into the die cavity, causing metal reaction and air entrapment inside the casting. Therefore, the final parts have a structure which is full of gas bubbles and oxide inclusions. Furthermore, pressure die casting parts typically cannot be machined, anodized, welded, and heat treated because of these defects[1?4].

To improve the quality and properties of the die casting process, semi-solid metal technique has been introduced. A lot of semi-solid die casting studies have reported that using semi-solid die casting helps to improve the properties and increase the quality of die casting parts[5?7]. Semi-solid metal forming using therheocasting route can provide higher viscosity of thefluid. With the higher viscosity, less turbulent flow couldbe obtained, which helps to reduce air porosity and oxide inclusions during the die filling[5?7]. In addition, a rheocasting process can be easily applied with the conventional die casting process because the die casting machine only requires minor modifications[8].

Many research studies have shown successes in the semi-solid die casting with a rheocasting process[7?12]. However, most work have used the A356, A357, and ADC10 aluminum alloys. Despite ADC12 is used widely in the die casting industry, no complete research about semi-solid forming of this aluminum alloy has been published yet. The benefits of ADC12 aluminum alloy are good fluidity, excellent castability and high mechanical properties. In contrast, it is easy to have turbulent flow, which causes porosity defect, and it cannot normally be heat treated because of the surface blister and the pore expansion at hightemperatures[13?14].

To solve the problems of ADC12 aluminum alloy, a semi-solid die casting process is selected to study in this work. The main objectives of this research are to study the feasibility of 1) the semi-solid processing of ADC12 aluminum alloy using the gas induced semi-solid (GISS)

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