性能的影響
侯 駿2，佟國侗2, Y.Matsumoto3， M.M.H.Kochi3
( 1. 清華大學機械工程系， 北京 100084；
2. 中國一汽 鑄造有限公司，長春 130011；
3. Toyo Machinery & Metal Co Ltd, Fukusato, Futami-cho, Akashi-shi,Hyogo-ken, 674-0091, Japan)
摘 要: 以鎂合金發(fā)動機缸蓋罩蓋為研究實例，對鎂合金壓鑄過程中減速減壓工藝對型腔內(nèi)壓力變化、 鑄件外觀質(zhì)量、 鑄件性能、 鑄件內(nèi)孔洞的影響進行了研究。 結(jié)果表明： 鎂合金壓鑄充型過程中采用減速或減壓工藝會造成型腔內(nèi)充填壓力降低，導致鑄件表觀質(zhì)量下降； 分別采用減速或減壓工藝， 型腔內(nèi)的增壓壓力稍有降低， 鑄件內(nèi)孔洞數(shù)量和尺寸稍有增加， 鑄件強度和密度隨之降低； 同時采用減速和減壓工藝，型腔內(nèi)充填壓力和增壓壓力顯著下降， 鑄件內(nèi)孔洞數(shù)量和尺寸明顯增加， 鑄件強度和密度隨之顯著下降。
關(guān)鍵字: 鎂合金； 壓鑄； 減速； 減壓； 表觀質(zhì)量；性能
LIU Bai-cheng1, WANG Gang1,
HOU Jun2, TONG Guo-dong2, Y.Matsum
（ 1. Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, China;
2. Foundry Ltd. of the First Automotive Works, Changchun 130011, China;
3. Toyo Machinery & Metal Co Ltd, Fukusato, Futami-cho, Akashi-shi,Hyogo-ken, 674-0091, Japan）
Abstract: A magnesium cylinder head cover was used to experimentally study the influence of application of decreasing speed technology(denoted as DST) and decreasing pressure technology(denoted as DPT) on pressure variations in the die cavity, the surface quality, properties and gas porosity of magnesium alloy die castings. The results show that the application of DST and DPT during mold filling of magnesium die casting leads to the decrease of filling pressure and the decrease of surface quality of the castings. Application of DST or DPT respectively causes the decrease of the pressure during pressure intensification stage and a little increase of the number and size of gas porosity in the castings. As a result, the tensile strength and density of the castings decrease. Application of DST and DPT simultaneously causes a great decrease of filling pressure and the pressure during pressure intensification stage and a sharp increase of the number and size of gas porosity in the castings. Accordingly, the tensile strength and density of the castings decrease greatly.
Key words: magnesium alloy; die casting; decreasing speed; decreasing pressure; surface quality; property
