一、芯砂的强度要求 黏结剂只用白泥,而没有采用其他的黏结剂,这样就降低了泥芯的坚固性,结果引起大量废品(主要是夹渣、泥芯损坏、气孔等),因此是不合适的。 现用的芯砂缺点很多,它的通气性不合实际要求。 湿试样的强度是靠水分支持的,干试验强度很低。 建议: 1.应把中国现有 First, the strength of the core sand requires only white mud binder, and did not use other binders, thus reducing the solidity of the mud core, resulting in a large number of waste (mainly slag, mud core damage, porosity, etc.) So it is not suitable. The core of the sand has a lot of disadvantages, its ventilation does not meet the actual requirements. The strength of the wet test specimen is supported by moisture, and the dry test strength is very low. Suggestions: 1. Should be existing in China