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无 《中国铸造装备与技术》2005,(3):71-72
蠕墨铸铁具有类似球墨铸铁的强度,又有类似灰铸铁的减振、导热能力及铸造性能,优于灰铸铁的韧性和一定工况下较高的耐热疲劳性能,可在较高碳当量下得到高强度,从而较易使铸件薄壁轻量化。蠕墨铸铁作为一种有潜力的工程材料正引起人们的重视。以拉动国民经济其它各行各业发展的汽车工业为例,上世纪后期汽车为了提高功率、降低能耗、 相似文献
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王启恒 《中国铸造装备与技术》1997,(5):7-9
汽车发动机趋向体积小、重量轻、转速高、功率大的方向发展,对活塞环的要求越来越高,传统的灰铸铁及合金铸铁等材料已不能满足要求。蠕墨铸铁的力学性能及其他物理性能比灰铸铁及合金铸铁好得多,而工艺性能与灰铸铁相似。以蠕墨铸铁代替合金灰铸铁制造活塞环,不但具有良好的性能,而且成本也较低。 相似文献
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采用不同的扫描速度、喷射速度和浇注温度对HT250灰铸铁汽车刹车盘进行了3D打印铸造试验,并进行了拉伸试验和磨损试验。结果表明:在试验条件下,随扫描速度从3 mm/s上升至15 mm/s、喷射速度从0.5 m/s上升至2.5 m/s、浇注温度从1390℃上升至1470℃,刹车盘的拉伸性能、耐磨损性能均先提高后下降。最佳工艺参数为:扫描速度9 mm/s、喷射速度2 m/s、浇注温度1450℃。 相似文献
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《中国铸造装备与技术》2009,(4):62-62
2009年6月2日,美国商务部发布公告,对原产于中国的刹车盘作出反倾销行政复审终裁,并取消中国汽车工业进出口有限公司(China National Automotive Industry Import & Export Corporation)和山东莱州华汽机械有限公司(Shandong Laizhou CapcoIndustry)的行政复审。 相似文献
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总结了目前我国高精度机床灰铸铁铸件生产中存在的问题,叙述了制造业发展对机床灰铸铁铸件的质量要求,介绍了影响机床灰铸铁铸件性能的因素,提出了实现高碳当量高强度机床灰铸铁铸件生产的有效途径. 相似文献
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灰铸铁活塞铸件的热稳定性和硬度均匀性较差,降低了活塞的抗腐蚀性和耐磨性.为了提高灰铸铁活塞在铸态下的性能,满足使用要求,分别从原材料和化学成分的选择、造型工艺和浇注系统设计、熔炼、孕育等方面进行优化和有效控制,成功生产了在铸态下满足技术要求的灰铸铁活塞铸件.铸件合格率在95%以上,已广泛用于铁路货车的制动缸上. 相似文献
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O. Maluf M. Angeloni D.B.V. Castro W.W. Bose Filho D. Spinelli C.O.F.T. Ruckert 《Journal of Materials Engineering and Performance》2009,18(7):980-984
The purpose of this work was to experimentally investigate the thermal diffusivity of four different gray cast iron alloys,
regularly used to produce brake disks for automotive vehicles. Thermal diffusivity measurements were performed at temperatures
ranging from room temperature to 600 °C. The influence of the thermal conductivity on the thermomechanical fatigue life is
also briefly presented. The measurements were sensitive to the influence of the carbon equivalent and alloying elements, such
as molybdenum, copper and chromium. Molybdenum, unlike copper, lowered the thermal diffusivity of the gray cast iron, and
alloy E (without molybdenum), besides presenting a relatively low carbon equivalent content and an increase in the values
of the thermal diffusivity, presented the best performance during the thermomechanical fatigue. The molybdenum present in
alloys B and C did not fulfill the expectations of providing the best thermomechanical fatigue behavior. Consequently, its
elimination in the gray cast iron alloy for this application will result in a significant economy. 相似文献
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Ahmet Avcı Nevzat İlkaya Mehmet Şimşir Ahmet Akdemir 《Journal of Materials Processing Technology》2009,209(3):1410-1416
In the present experimental study, strengthening of gray cast iron by reinforcing with steel plates was investigated in the as-cast and normalized conditions. Normalizing heat treatments were applied to the specimens at temperatures of 800 °C and 850 °C. Three-point bend specimens were manufactured from gray cast iron and also from gray cast iron with reinforced steel plates. Flexural strengths of the steel-plate-reinforced cast iron were calculated for four distinct volume fractions (Vr = 0.04, 0.08, 0.12, and 0.16). The current study shows that the steel-plate-reinforced gray cast iron has higher flexural strength and flexural modulus than the cast iron without reinforcement. The flexural strength considerably increases with slight increase in normalization temperature. Optical and scanning electron microscopy analyses were used to examine flake morphology and microstructures of gray cast iron and steel-plate-reinforced gray cast iron. It is noted that carbon diffuses from the gray cast iron to the steel plates. A transition region containing partially dissolved graphite and having high hardness was observed due to the carbon diffusion. 相似文献
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目前,通常采用加Mo高强度灰铸铁生产本体抗拉强度大于250MPa的大马力发动机缸体,由于Mo-Fe价格一直居高不下,使生产成本提高。因此开发低成本、高强度、易加工的灰铸铁具有重大意义。采用变质处理方法,生产满足大马力发动机缸体性能要求的不含Mo高强度灰铸铁,对比研究了含Mo与变质处理不含Mo高强度灰铸铁在钻削加工过程中的钻削抗力、扭矩、钻头磨损形貌、钻屑特征及两种灰铸铁的石墨形态、尺寸、分布和基体珠光体片间距对钻削加工性能的影响规律。结果表明,变质处理可以获得细小、弯曲、均匀分布的片状石墨,能够改善灰铸铁的钻削加工性能,同时提高抗拉强度。这为灰铸铁大马力发动机缸体毛坯国产化生产奠定了基础。 相似文献