Molten iron filtering apparatus for casting

Abstract

The invention relates to a molten iron filtering apparatus for casting. The apparatus comprises a ceramic filter seat, the ceramic filter seat is provided with an inlet end, an outlet end and an inner cavity pipeline, a filter screen is obliquely arranged in the inner cavity pipeline of the ceramic filtering seat at an angle of 30-60DEG to the horizontal, the inner wall of the inner cavity pipeline is provided with an inner step for fixing the filter screen, the internal opening of the inlet end is rectangular, the internal opening of the outlet end is circular, and the caliber dimension of the internal opening of the inlet end of the ceramic filter seat is greater than the dimension of the maximum outer rim of the filter screen in order to conveniently put the filter screen in the inner cavity pipeline of the ceramic filter seat from the internal opening of the inlet end. The filter screen is obliquely arranged in the filter seat at a certain angle, so the internal space of a casting system is effectively utilized; and when molten iron flows through the ceramic filter seat, the obliquely arranged filter screen improves the filtering area, light molten slag and impurities in the molten iron upward float in the upper portion space of the filter screen, and the lower portion filter screen still can filter the molten iron to realizes the slag prevention effect of the filter screen.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a casting molten iron filtering device. Background technique [0002] In the production of resin sand ductile iron castings, because the ductile graphite material is easy to oxidize and has poor welding performance, the castings are prone to slag and sand inclusion defects, resulting in a high rejection rate of castings and increasing the cost of castings. To solve this problem, in the prior art, a filter screen is provided in the pouring system to filter out slag and impurities before the molten iron enters the cavity. For small parts, the filter is directly placed in the runner. This method cannot solve the slag and impurities formed by the subsequent runner and in-casting; for large parts, due to the filtering capacity of the filter, it needs to be installed in the in-runner. Generally, there are two ways to place the filter screen, one is to overlap the runner and the inner...

AI Technical Summary

Problems solved by technology

For small parts, the filter is directly placed in the runner, this method cannot solve the slag and impurities formed by the runner and in-casting; for large parts, due to the filtering capacity of the filter, it needs to be installed in the in-runner

Generally, there are two ways to place the filter screen, one is to overlap the runner and the inner runner, and the other is to use the filter to embed the sand mold directly during the molding process. The above methods have low space utilization or complicated operations. Impurities in the filter cannot be cleaned, etc.

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