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传统的压实造型法仅仅是从砂型上面进行压实,其压力向深层传递是困难的,故砂型底面的硬度不太高,就是双向压实也有缺点。作者研究出一种叫做模板压实造型的新造型方法,这种方法的压实有三个工序。首先,相传统方法一样从上面压实,其次是抬高造型机压头和装有型砂的砂箱,使砂箱和模板间有一间隙,最后以此间隙为冲程由模板冲压砂型底面。上面压实和底面压实的顺序有六种改变,用两个带有凹槽的模样和阀体模样造型,用湿型硬度计检查效果。结果是,从底面压实对靠
The traditional compaction modeling method is only compacted from the sand. The pressure is difficult to transmit to the deep layer. Therefore, the hardness of the bottom surface of the sand is not too high, and the two-way compaction has disadvantages. The authors developed a new modeling method called template compaction modeling, which has three processes for compaction. First of all, the conventional method is compacted from above, followed by raising the head of the molding machine and the flask containing the molding sand, so that there is a gap between the molding flask and the mold. Finally, the bottom of the mold is pressed by the gap for the stroke. There are six changes in the order of compaction and compaction of the bottom, using two grooved patterns and valve body shapes, and a wet type hardness tester to check the effect. The result is compaction from the bottom