Effect of Casting Filter Quality on Dimensional Accuracy

The dimensional accuracy of the cast filter screen includes the three-dimensional dimensional accuracy and flatness of the appearance. Whether the filter is used for green sand or self-hardening sand, it requires a small dimensional tolerance, which can fit well into the pre-made holes on the sand mold for placing the filter. . The high-quality filter king can neither cause the phenomenon of "big piece but small hole" that cannot be placed, nor will it cause the gap between the filter and the hole to be too large to cause side flow of molten metal.

The flatness of the filter is equally important. If it is warped, in addition to the easy side flow of molten metal during pouring, it will also cause uneven stress, especially for self-hardening sand molds, which increases the risk of damage due to the filter being unable to withstand thermal shock. sex. Dimensional accuracy can be measured using calipers. Flatness is determined by placing the filter on a flat surface (such as flat glass) to observe the degree of warpage.

In summary, the impact of cast filter quality on filter performance is mainly reflected in four aspects. One is the impact on thermal shock resistance; the other is the impact on chilling resistance; the third is the impact on pore uniformity; the fourth is the impact on pore uniformity. influence on dimensional accuracy. It can be seen that inferior filters not only do not help casting, but can also cause problems such as insufficient pouring, cold isolation, and increased inclusions. Therefore, when purchasing, we must choose high-quality filters.