共查询到18条相似文献,搜索用时 78 毫秒
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研究了不同的炭化温度对层状结构受电弓滑板性能的影响。将受电弓滑板在400、600、800℃的氮气气氛中进行热处理,通过测试受电弓滑板的密度、耐温性、导电性、抗冲击性和耐磨性能,讨论了炭化温度对其性能的影响;利用SEM观察磨损表面,分析磨损机理。结果表明层状结构受电弓滑板的密度随炭化温度的升高而减小;当炭化温度高于600℃时,受电弓滑板表现出良好的耐温性。炭化提高了材料的导电性,但冲击强度和耐磨性随炭化温度的升高而降低;炭化温度较低时,受电弓滑板的磨损机制为粘着磨损为主,当炭化温度较高时,磨粒磨损和粘着磨损成为主要的磨损形式;确定最佳炭化温度为600℃,该温度下炭化处理后具有较好的综合性能,符合TB/T 1842.2-2002标准的相关规定。 相似文献
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通过分析当前电力机车受电弓滑板存在的各种问题,用粉末冶金法研制出一种新型的受电弓滑板.该滑板由铜、碳纤维和石墨等构成.分析了成形压力、烧结温度对滑板性能的影响,对其导电性、摩擦、磨损性能及冲击韧性进行了检测,并与当前正在使用的受电弓滑板进行了对比.结果表明:该新型滑板的最佳制备工艺条件为(含量)铜78%,碳纤维2%,石墨15%,添加剂5%,成形压力为200MPa,烧结温度为880℃.该滑板不仅电阻率低,而且其摩擦、磨损及冲击韧性等性能也优越于当前正在使用的受电弓滑板.与国外浸金属碳滑板Rh82Mb相比,其摩擦系数降低20%,磨损量减少1.3%,冲击韧性提高1.7倍,导电性增强65倍. 相似文献
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铜基受电弓滑板材料抗拉强度和冲击韧性研究 总被引:8,自引:0,他引:8
为了制备具有优良力学性能的C/Cu复合材料,采用传统的粉末冶金(PM)方法,首次将受电弓滑板中C的质量分数提高到8%(石墨粒径为295μm和495μm),分析了压制压力、保温时间和烧结温度对其抗拉强度和冲击韧性的影响,研究了石墨粒径和镀铜石墨对受电弓滑板材料性能的影响。研究结果表明:增大压制压力,可提高铜基受电弓滑板材料最终烧结件的抗拉强度;延长烧结保温时间,则降低烧结件的抗拉强度;烧结温度过高或过低对烧结件抗拉强度和冲击韧性不利;石墨粒径对铜基受电弓滑板材料性能的影响很大;石墨表面镀铜,可改善铜基受电弓滑板材料的烧结过程,提高其抗拉强度和冲击韧性,但是不改变材料的断裂机制。 相似文献
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沈文杰 《中国新技术新产品》2013,(23):10-12
本论文从电气化铁路受电弓滑板的动态响应入手,通过配置在低压端激光测距传感器,测试受电弓滑板在弓网接触力作用下产生的位移,利用事先得到的传递函数矩阵,计算出接触压力、硬点,拉出值和导线高度。文中推导了响应关系矩阵和传递函数矩阵的数字计算方法,并通过简单算例进行了仿真。 相似文献
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滑动受流条件下,树脂基滑板材料的温升会影响滑板使用的稳定性。采用炭化-液相浸渍法对滑板进行热稳定性及致密化处理,系统分析了热处理前后滑板性能的变化,并对致密化效果进行评价,利用磨损表面扫描图像分析摩擦磨损机理。结果表明:经过800℃热处理后,滑板的耐温性提高;热处理及浸渍后,受电弓滑板试样电阻率明显减小,热处理之后电阻率降低约100%;冲击强度降低,摩擦因数增大,体积磨损量增加;经过4次致密化处理后,滑板的气孔率下降约45%;冲击性能和摩擦磨损性能有所提高;未热处理的受电弓滑板在摩擦过程中主要的机械磨损形式是磨粒磨损和黏着磨损;热处理后磨粒磨损是主要磨损形式。 相似文献
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高殿荣|赵建华|张作超 《工程力学》2013,30(4):423-428
目前液体静压导轨的导轨面内一般设计成对称单行、若干列油腔。油腔的数目(即列数)是液体静压导轨设计中的关键,对导轨的动态、静态性能都有着较大的影响。以液体静压导轨的单一导轨面为研究对象,分别作用垂直和倾覆载荷,推导了导轨的承载能力、静刚度与油腔数目的数学关系式,并进行了相应的分析。以工程中的滑板系统为例,滑板导轨面内分别对称设计单行,2列~6列油腔的五种方案。以滑板的承载能力、静刚度为性能依据,对五种方案进行对比分析,结果发现设计成单行、3列油腔时滑板的性能最佳。 相似文献
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At present, the thrust of an anti-slide pile can be worked out with some calculation methods. However, the resistance in front of the pile, the distributions of resistance and thrust, and appropriate pile length cannot be easily obtained. In this paper, the authors apply the strength- reduction finite element method (FEM) to several cases of design of anti-slide piles. Using this method, it is possible to take the pile-soil interactions into consideration, obtain reasonable resistance in front of pile and the distributions of thrust and resistance, and reasonable lengths of anti-slide piles. In particular, the thrust and resistance imposed on embedded anti-slide piles can be calculated and composite anti-slide pile structures such as anchored piles and braced piles can be optimized. It is proved through the calculation examples that this method is more reliable and economical in the design of anti-slide pile. 相似文献
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This study has investigated the influence of physiographic factors upon the probability of slide occurrence in the Kaoping River Basin. According to previous literature, statistical tests, and physical mechanisms, three physiographic factors (slope steepness, the dip slope ratio, and the time-dependent landslide ratio) were significantly related to slide occurrence. These were combined with hydrological factors (cumulative rainfall) to establish an assessment model for estimating the probability of slide occurrence using logistic regression. The model’s overall accuracy in the training and validation stages was about 81%. Overall, 20 randomly selected historical rainfall events were employed for verification, including 10 events each with and without slide occurrence. The results showed that the model accuracy was approximately 80%, if the probability threshold Psh is set to be 0.5.
This assessment model can assist in prediction of slide occurrence and the proposed subsequent engineering measures or vegetation restoration is often able to reduce the landslide ratio and the probability of slide occurrence. After landform changes, the model’s physiographic factors can be updated to adjust the rainfall threshold for slide occurrence. Given an appropriate cumulative rainfall and an acceptable risk of slide occurrence, the model can identify priority regions for slide prevention. 相似文献
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分析了偏置式曲柄滑块机构的运动学、动力学以及结构学特点 ,探索了偏置式曲柄滑块机构设计的规律和方法 ,研究了输罐曲柄滑块机构的设计理论和途径 相似文献