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在设备修理中,常碰到大、中型剖分式巴氏合金轴瓦严重损坏的问题,这时就必须在旧瓦上重新浇铸巴氏合金。如何在旧瓦上成功的浇铸巴氏合金;如何在多种工艺中,选择一种简单易行、适合设备修理特点的工艺,是机修行业共同关注的问题之一。 相似文献
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我国汽车发动机的轴瓦,一向主要用巴氏合金来制造。即使在目前,巴氏合金轴瓦仍然要占到全部生产轴瓦的85%以上。五十年代后期,我国汽车上用的轴瓦曾普遍使用苏联牌号的铅合金COC6-6来制造。但是这种合金的强度太低,加上当时国内还没有带形浇铸设备,除解放牌主机用的是进口COC6-6连续浇铸钢带外,其余全都用离心浇铸法生产,因此合金层金相组织亦不理想。据调查,当时汽车轴瓦的使用寿命一般仅四至五万公里,少的不到两万公里。主要 相似文献
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现场浇铸小水电站轴瓦工艺探讨龚咀发电厂(614905)吴慎程小水电站机组轴瓦的巴氏合金时有烧坏现象发生,需重新在轴瓦上浇铸,常被迫停机检修,影响机组安全运行和经济效益。巴氏合金是指浇铸在轴瓦表面上的易熔合金,主要有锡基和铝基两种。两基具有较好减摩性和... 相似文献
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周昭青 《机械工人(热加工)》1985,(1)
我们浇注的轴瓦钢壳尺寸为:外径240毫米,内径220毫米,宽130毫米。巴氏合金层的成品厚度为1.5毫米,浇注厚度为5毫米,牌号为ZChSnSbll-6。由于钢壳挂锡后清理和往离心浇铸机上装卡所需的时间较长,锡层容易氧化,浇铸的合金不易与钢壳粘合,于是产生脱壳现象。根据书上介绍,脱水氯化铵(NH_4Cl)可作为巴氏合金的精炼剂,设想氯化铵也能用来净化镀锡层,于是就进行试验,并获得了令人满意的结果。具体做法是: 相似文献
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《机械工人(冷加工)》1958,(1)
我厂用离心浇铸制成的巴氏合金轴衬,要由甜工将它锯成两半。由于巴氏合金性质软而韧,容易损坏锯条,并且工作效事很低。现在改用木工车间用小了的圆锯,将它的齿形修磨好,并在齿的前面、后面及两侧面进行电火花强化,以提高它的表面硬度。我厂目前采用的圆锯片(如图甲),直径为280~300公厘;前角 相似文献
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介绍一种用于整体巴氏合金浇铸胎具的设计方案及安装、拆卸、使用时的注意事项,以及在该胎具设计过程中三维设计软件具体应用方法及操作技巧,实践证明该新型胎具提高了整体巴氏合金浇铸的工作效率。 相似文献
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巴氏合金,作为一种典型的滑动轴承材料,广泛应用于矿山、冶金、化工、交通,电力等各部门。然而,各种浇铸巴氏合金的零部件在生产和使用过程中,常常由于脱壳、气孔夹杂,磨损、疲劳、划痕、腐蚀等原因而失效,造成很大的损失。近年来,随着热喷涂技术的发展,人们将巴氏合金制成粉末,用火焰喷涂的形式进行修造,取得了显著的经济效果。不仅简化了工艺,节约了金属,降低了成本,而且,由于巴氏合金粉末喷涂层的耐磨特性优于浇铸巴氏合金,摩合时间 相似文献
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慕春 《机械工人(热加工)》1958,(1)
滑动轴承一般是用低碳钢(15号钢)或其他材料(如锡青铜等)作为底瓦,再在瓦面上浇铸一薄层巴氏合金、滑动轴承经过长时间的使用磨损到一定程度时,就不能再继续使用了。需要将已经磨损的巴氏合金熔掉,重新浇铸。 相似文献
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Wear experiments on ZnAl12Pb alloy and Pb‐based Babbitt alloy (Zch PB16‐16‐2) have been carried out under identical conditions. The wear behaviour of the alloys has been investigated using scanning electron microscopy and surface profile analysis. The results show that ZnAl12Pb alloy is a good material for bushing or bearing applications, and the wear resistance of ZnAl12Pb alloy is better than that of Pb‐based Babbitt alloy. 相似文献
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为了提高巴氏合金在油润滑条件下的摩擦学性能,在巴氏合金表面加工凹坑微织构并利用光固化填充方法填充六方氮化硼(h-BN)固体润滑剂,制备出h-BN与表面微织构相结合的复合润滑结构。研究复合润滑结构在油润滑条件下的摩擦学性能及其减摩润滑机制。结果表明:复合润滑结构的摩擦学性能远高于未织构面和纯织构面;当凹坑微织构直径较小时,织构密度为10%~20%时,复合润滑结构摩擦因数较小,而凹坑直径较大时,随着织构密度的增加,复合润滑结构摩擦因数逐渐减小;当织构密度小于20%时,凹坑直径较小的复合润滑结构摩擦因数小,当织构密度达到30%时,随着凹坑直径的增加,复合润滑结构摩擦因数减小。复合润滑结构能够改善巴氏合金表面摩擦学性能,是因为h-BN固体润滑剂的释放在巴氏合金表面形成了固体润滑薄膜,避免了润滑油膜较薄处的巴氏合金表面直接与45钢表面接触,且释放h-BN固体润滑剂后的微织构凹坑可以起到收集磨粒,储存润滑油的作用。 相似文献
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N. P. Aleshin N. V. Kobernik R. S. Mikheev V. E. Vaganov V. V. Reshetnyak A. V. Aborkin 《Russian Engineering Research》2016,36(1):46-52
Modification of Babbitt coatings by carbon nanotubes in plasma–powder application is considered. A model is proposed for the interaction of a graphene-like surface and atoms from the Babbitt alloy. The influence of carbon nanotubes obtained by different means on the performance of antifrictional coatings is studied. 相似文献
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Aiming at improving the tribological performances of sliding bearings in mixed or starved lubrication regime, textures in square and linear radiating arrays are ablated on the surface of Babbitt alloy disks by laser radiation. Series of pin-on-disk wear tests and computational fluid dynamics (CFD) analysis are conducted to investigate the influence of distribution and geometry of the textures under various operating conditions. Results suggest that surface texturing suitably interacts with the material properties of Babbitt metal favorably improving its tribological performance. Friction coefficients of the disks with textures arrayed in square are generally much lower and more stable as compared to their counterparts with textures arrayed in linear radiation. Also, textures arrayed in a square with an area density of 8.6 % allow the lowest friction coefficient, as low as 0.015, to be achievable. Theoretical analysis sheds the light that proper texture arrangements tend to generate favorable distribution of micro-hydrodynamic pressure to improve the tribological performance of Babbitt alloy significantly. 相似文献
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The microstructure of β-phase of Sn11Sb5.5Cu Babbitt produced by casting and liquid forging has been analyzed by optical and scanning electron microscopy using EBSD analysis. It has been established that a significant decrease in the wear rate of Babbitt produced by liquid forging is caused by generation of fine grain structure in the particles of the β phase. 相似文献
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锡基巴氏合金是滑动轴承内衬材料的主要种类之一,在采用传统工艺进行浇铸过程中极容易产生氢鼓泡、脱壳等严重缺陷,造成废品。对合金结晶过程分析之后改进了传统工艺,设计了一种新型工装方式和冷却工艺,从而改变合金结晶过程,解决了由于合金浇铸产生脱壳及氢鼓泡等问题。 相似文献
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In this article, the tribological behaviors of tin-based Babbitt alloy ZChSnSb 8–8 sliding against AISI 302 stainless steel lubricated by seawater were investigated. The results indicated that the friction coefficient decreases with increasing load and sliding speed, and the wear rate increases slightly with load but decreases with sliding speed. The low friction coefficient and wear rate are attributed to the unique “concrete structure” and seawater. As a lubrication medium, seawater has lubricating, cooling, and corrosive effects on the sliding couple. 相似文献