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单铸试样分梅花试样和单根试样两类。图1为目前普遍使用的一种熔模单铸梅花试样。 梅花试样的浇注系统补缩条件好,铸造缺陷集中于梅花心部,试样组织致密,性能稳定。这种试样用于熔模铸件很不理想,这是因为熔模铸件多为薄壁小件,与厚大的梅花试样相比,两者在浇注条件、冷却速度、补缩程度等方面均有很大差异。显然,梅花试样用于熔模铸件,只能反映该铸件合金的性能,而不能准确反映该铸件的实际性能。另外,梅花试样金属利用率很低,加工量大,
Single cast sample plum sample and a single sample two categories. Figure 1 is currently a common use of a single-shot fused plum blossom sample. The pouring system of plum sample has good feeding condition, the casting defects are concentrated on the heart of plum blossom, the sample is compact and the performance is stable. This sample for investment casting is not ideal, this is because the investment casting is mostly thin-walled small pieces, compared with the thick plum sample, both in terms of casting conditions, cooling rate, degree of refill and so on There are big differences. Obviously, Plum samples for investment casting, casting performance can only reflect the performance, but can not accurately reflect the actual performance of the casting. In addition, plum sample metal utilization is very low, large amount of processing,