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在我厂修复内燃机车的某车库里,发现在试车期间柴油机轴承衬套有剧烈的磨损。厂里为了查明组体轴承磨损快的原因,进行了专门的研究。确定了磨损快的原因是高强度铸铁的质度不均。如果珠光体基体的显微硬度等于HB350,则在石墨粒子周围铁素体边缘硬度为HB150。所以,在磨削这种材质的曲轴时,在轴颈表面形成球状石墨的暗销,如图1所示。用显微镜观察这种轴颈与多刀的磨具相似。按通常的工艺为使珠光体变钝须将曲轴轴颈抛光,并建议采用倒向磨削。
In my factory to repair a garage of a diesel locomotive, we found that during the test, the diesel engine bearing bush had severe wear and tear. In order to find out why the bearing wear quickly, the factory made a special study. Determine the reason for rapid wear high-strength cast iron uneven quality. If the pearlite matrix has a microhardness equal to HB350, the ferrite edge hardness around the graphite particles is HB150. Therefore, the grinding of such a material crankshaft, the journal surface of the formation of dark graphite pin, shown in Figure 1. Microscopic observation of such journals and multi-knife abrasive similar. According to the usual process to make pearlite obtuse the crankshaft journal polishing, and recommended the use of reverse grinding.