运用数据表明,在很大一部分经受交变负荷作用的货车铸造零件中会形成疲劳裂纹。例如,损坏的自动车钩体中有大约一半是由于产生了疲劳裂纹以及疲劳裂纹扩展到临界尺寸所造成的。在铸件断口处实际上并未产生技术条件所不容许的大块铸造缺陷。这可通过研究铸造工艺和监督工艺的执行的途径来达到。在用湿砂型大量铸造大型铸件的情况下,要消除细小分散的微观缺陷实际上是不可能的。 The use of data shows that fatigue cracks are formed in a large proportion of truck cast parts subjected to alternating loads. For example, about half of a damaged auto coupler body is caused by the generation of fatigue cracks and the expansion of fatigue cracks to critical dimensions. In the casting fracture actually did not produce technical conditions do not allow the chunk casting defects. This can be achieved by studying the casting process and monitoring the execution of the process. In the case of casting large castings in large volumes with wet sand, it is virtually impossible to eliminate finely distributed microscopic defects.