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用化学成分分析、金相组织检验、硬度测试以及对刹车鼓的宏观和微观分析等方法,对刹车鼓刹车失灵进行分析.并探讨了刹车鼓失效的原因,失效形式以及对刹车鼓铸件质量控制。 相似文献
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用化学成分分析、金相组织检验、硬度测试以及对刹车鼓的宏观和微观分析等方法,对刹车鼓刹车失灵进行分析,并探讨了刹车鼓失效的原因、失效形式以及对刹车鼓铸件质量控制。 相似文献
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<正>汽车制动系统是汽车重要的安全系统,刹车盘、刹车鼓是该系统中关键的保安零件,是汽车零部件中适合大批量砂型铸造的铸铁件之一。山东烟台、龙口、莱州3个地区是中国汽车刹车盘、刹车鼓的生产基地,出口量和国内外主机厂配套量均占全国总产量的90%以上。铸元素自投放市场以来,上述3个地区先后有10家企业,4 5条造型线使用铸元素替代煤粉和膨润土生产刹车盘、刹车鼓铸件,取得令人满意的效果。 相似文献
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L. Segal 《NDT & E International》1999,32(7):369
The heat generation process during the work of brake mechanism, and also the change of its temperature in the early period of work is considered. Theoretical and experimental validation is provided for thermal diagnosis of vehicle brakes in a wheeled tractor as an example. The diagnostic parameter is adopted as the maximum rate of temperature increases in the drum brake under steady-state conditions. The braking moment is used as a structural parameter. 相似文献
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根据汽车制动鼓失效的各种现象分析制动鼓失效的原因和机理。从制动鼓设计和生产工艺两方面提出相应的改进措施,并着重就高w(C)量铸铁在制动鼓生产中的应用进行了详细的介绍。 相似文献
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介绍了常用灰铸铁制动鼓铸件的产品要求,采用铁型覆砂铸造生产灰铸铁制动鼓的工艺和生产实践,中的控制条件和注意事项. 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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In the case of employing brake discs as a key component of mechanical brake equipment, the initiation of thermal cracking
owing to repetitive thermal shock generated during braking may potentially lead to higher maintenance costs, worsened braking
performance, and greater risk of railway accidents. The purpose of this study is to gain basic data to facilitate application
of compacted vermicular (C. V.) graphite cast iron to brake discs in order to obtain high thermal crack resistance and improved
lifetime. To this end, this study developed three types of C. V. graphite cast iron with differing content of key elements,
including Ni, Cr, and Mo. Each test specimen underwent numerous tests for evaluation of materials characteristics, and the
results were compared with those obtained for existing materials. The test results show that the thermal fatigue lifetime
of material C is nearly double that of the conventional material. This demonstrates the suitability of material C as a material
for brake discs in mid- to high-speed railway vehicles. 相似文献