Fracture shield samples were taken for chemical composition inspection. After checking the chemical composition, wP ≤ 0.06, wS ≤ 0.06, wSi ≤ 1.0, all within the qualified range, excluding the reason for the composition.
Therefore, the preliminary judgment of the casting defect is the main reason for the front shield fracture. The internal shrinkage holes in the castings seriously affect the intrinsic quality of the castings, resulting in a reduced service life. For this reason, we analyze the reasons in depth.
(1) The bottom of the front shield outlet is a hot section, and the side riser is far from the bottom of the outlet. The feeding of iron liquid is limited here. According to the experience, the feeding efficiency of the riser is low, usually about 20%. The result is that the internal structure of the hot junction below the outlet is not dense and there are shrinkage defects.
(2) There is a lack of overflow at the top of the outlet of the front guard plate, and the low-temperature molten iron and gas in the early stage of casting cannot be discharged in time, causing casting defects such as blowholes.
(3)Environmental influences, moisture absorption of the core, generation of gas pores during pouring, and relative humidity of the production site of 70% to 80% according to the hygrometer.
(4) The arc below the outlet is small, only R2mm, the smaller arc leads to the formation of sharp angle sand in the production of core, so that here the sand refractoriness decreased, easy to produce sticky porosity defects.
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