一、问题的提出随着精密铸造生产的发展,要求及时反映精铸件的内在质量,避免因机械性能数据没有而使零件积压。但是,目前熔炼钢液的设备大多是采用容量较小的中频电炉。这样由于生产量大,每天熔炼炉次多,如果采用梅花试样,不仅要耗费大量的氧气切割,并且切割形状很不规则,给机械加工带来很大的困难,劳动量 First, the question raised With the development of precision casting production, require timely reflection of the inherent quality castings, to avoid the lack of mechanical performance data backlog of parts. However, the current equipment for melting molten steel is mostly used by smaller capacity IF electric furnace. So because of the large amount of production, melting furnace times per day, if the plum sample, not only to spend a lot of oxygen cutting, and the cutting shape is very irregular, bring great difficulties to the machining, the amount of labor