共查询到19条相似文献,搜索用时 328 毫秒
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半固态铸造技术的研究状况及应用 总被引:1,自引:0,他引:1
半固态铸造技术以其高效、节能、近终化成形以及成形件性能优异等诸多特点,在汽车、计算机、通讯电子、航空航天等尖端领域具有广阔的应用前景,逐渐获得广泛关注。介绍了半固态铸造技术的工艺原理、工艺特点、半固态合金的制备、半固态合金的成形方法以及半固态铸造技术的工业化应用,最后对半固态铸造技术的长远发展作了展望。 相似文献
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2.半固态铸造技术 半固态铸造是近30多年发展起来的新一代成形技术,可获得高致密度的合金制品,见图14。若能够解决设备成本高、产品废品率高及生产效率较低的缺点,半固态铸造将成为极具竞争力的铝、镁合金成形方法。半固态铸造与各种铸造方法性能对比见图15。 相似文献
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半固态成形技术作为一种新型的金属成形工艺,是最有发展前景的绿色制造技术之一。本文介绍了半固态铜锡合金体系的设计、半固态浆料的制备及成形技术、微观组织与力学性能等三方面的研究进展。 相似文献
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采用半固态成形替代传统的铸造和机加工成形隧道风机叶片,以实现近净成形和提高产品质量。采用PLCO半固态黏度模型,基于Procast2008铸造软件平台,对隧道风机叶片的成形进行模拟。研究了浇注温度、冲头速度和模具温度等工艺参数对隧道风机叶片半固态成形的影响,确定了合理的工艺参数:浇注温度为575℃左右、冲头速度为1m/s左右,模具温度在200℃左右。在该工艺参数条件下,充填过程平稳、凝固时间较短,有利于获得质量优良的成形件。 相似文献
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半固态金属成形技术(下) 总被引:1,自引:0,他引:1
五、半固态成形的应用1.在铝合金制备中的应用目前半固态金属成形应用最成功和最广泛的是在铝合金的制备中。其原因不仅是因铝合金的熔点较低和使用范围广泛 ,而且铝合金是具有较宽液固共存区的合金体系。在铝合金工业中 ,包括Al Cu合金、Al Si合金、Al Pb合金和Al Ni合金等 ,特别值得一提的是半固态金属成形技术已开始应用于制备铝合金制品。图 3所示是半固态成形的铝合金零件。目前 ,半固态成形的铝合金零件重量可达 7kg以上。图 3 半固态成形的铝合金零件2 .在其它材料中的应用对于镁合金和铜合金 ,也可以应用SSM… 相似文献
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正硼合金具有低成本、高硬度、高耐磨性等优点,有望成为继镍硬铸铁与高铬铸铁之后的新型耐磨材料。但硼合金韧性处于较低的水平,很难应用于冲击载荷较大的工况。本文研究了半固态加工技术铸造硼合金的组织和性能,通过半固态铸造显著提高了硼合金的冲击韧度。 相似文献
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Dawei Yi Jiandong Xing Shengqiang Ma Hanguang Fu Wei Chen Yefei Li Jingbo Yan Jianjun Zhang Zhuxin Liu Jing Zhu 《Tribology Letters》2011,42(1):67-77
This study investigates the effect of semi-solid processing on the microstructures, mechanical properties of low carbon Fe–B
cast alloy. The as-cast microstructure of Fe–B cast alloy consists of the eutectic boride, pearlite, and ferrite. Compared
with the coarse eutectic borides in the ordinary alloy, the eutectic boride structures in the semi-solid alloy are greatly
refined. Moreover, the boride area fraction, Rockwell hardness, impact toughness, etc., before and after heat treatment under
different casting methods are also investigated systemically. The wear behaviors of low carbon Fe–B cast alloy are studied
by three-body abrasive wear tester. The wear weight loss of semi-solid Fe–B cast alloy is lower than that of the ordinary
Fe–B cast alloy because of the lower average boride area for semi-solid specimen. Meanwhile, the wear mechanism of the low
carbon Fe–B cast alloy under different casting process is depicted and analyzed by using the physical models. 相似文献
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7000 系列高强铝合金已在航空、航天等领域得到广泛应用。但这类高强铝合金因合金元素含量高,存在凝固组织粗大且不均匀、合金元素偏析严重、铸件易开裂等问题,难以直接铸造成型。文中开展了7075 铝合金环缝式强电磁搅拌流变制浆及半固态精密成型技术的应用研究。研究表明,环缝式强电磁搅拌半固态精密成型技术有效提高了7075 铝合金成分均匀性,铸件组织细化,热裂倾向减少明显,合金的成型性能和零件的力学性能大幅提高,可以实现高强铝合金零件的近净成型。 相似文献
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This paper describes an attempt to enhance the wear properties of hypereutectic cast aluminium–silicon alloys produced by semi-solid metal (SSM) processing technique. The rheological experiments on SSM slurries were performed under continuous cooling condition from liquidus temperature. Wear characteristics of alloy under investigation were studied using pin on flat wear system over a range of normal load (10–40 N) at constant average sliding speed (0.2 m/s) against cast iron and stainless steel counter surface. Stir cast alloy showed lesser weight loss compared to conventional cast alloy. Stir cast and conventional cast alloys showed higher weight loss against the stainless steel as compared to that against cast iron counter surface. Optical microscopy of the conventional cast and stir cast hypereutectic alloy has shown that stir casting causes refinement of primary silicon particles and modification of eutectic silicon compared to conventional cast alloy. The scanning electron microscopy of wear surfaces was carried out to investigate the mode of wear. 相似文献
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光谱分析仪是压铸生产过程中用于产品成分质量分析的关键设备,其分析结果是控制压铸工艺参数的依据,对提高压铸铝合金产品质量具有重要的意义。为了建立压铸铝合金成分质量分析的计算机网络系统,研制出一种光谱仪数据采集系统,通过解读打印机输出端口,将光谱仪的分析结果采集到单片机系统中,应用MAX490通信接口设计,实现数据采集系统和成分质量分析系统的远程通信。现场使用和实验表明,该系统具有较高的可靠性和性价比。 相似文献
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Jiehua LI Bernd OBERDORFER Daniel HABE Peter SCHUMACHER 《Frontiers of Mechanical Engineering》2018,13(1):48-52
Three types of near-net shape casting aluminum parts were investigated by computed tomography to determine casting defects and evaluate quality. The first, second, and third parts were produced by low-pressure die casting (Al-12Si-0.8Cu-0.5Fe-0.9Mg-0.7Ni-0.2Zn alloy), die casting (A356, Al-7Si-0.3Mg), and semi-solid casting (A356, Al-7Si-0.3Mg), respectively. Unlike die casting (second part), low-pressure die casting (first part) significantly reduced the formation of casting defects (i.e., porosity) due to its smooth filling and solidification under pressure. No significant casting defect was observed in the third part, and this absence of defects indicates that semi-solid casting could produce high-quality near-net shape casting aluminum parts. Moreover, casting defects were mostly distributed along the eutectic grain boundaries. This finding reveals that refinement of eutectic grains is necessary to optimize the distribution of casting defects and reduce their size. This investigation demonstrated that computed tomography is an efficient method to determine casting defects in near-net shape casting aluminum parts. 相似文献