一、用冲样器测定造型混合料的紧实性1.试验目的:紧实性试验是为确定松散型砂受紧实时高度减小的百分比。紧实性数值直接关系到工艺情况,并反映了型砂的混匀程度。紧实性数值与砂子比重无关,因此,为了测定混匀程度和确定型砂含水量要求,紧实性试验要比体积密度试验好。 First, determine the compaction of the molding mixture with a sampler 1. Objectives of the test: The compaction test is to determine the percentage of loosely packed sand that is highly reduced in real time. Compaction values ​​are directly related to process conditions and reflect the degree of mixing of the sand. Compaction values ​​have nothing to do with the specific gravity of the sand, so compaction tests are better than bulk density tests in order to determine the degree of mixing and to determine the moisture content of the sand.