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Formation of hot crack defects in railway steel castings

The main defects in the trial production of hook body and hook tongue parts are crack, air hole, sand inclusion and mechanical sand sticking. Cracks are mainly thermal cracks, that is, the cracks caused by the obstruction of solid-state shrinkage of steel castings when the steel castings are still...

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Crack defects of Wet Mold clay sand steel castings

Although the wet mold clay sand has good concession and refrigeration, crack defects still appear from time to time in the production of Wet Mold clay sand steel castings. The wet mold clay sand has high moisture content, rapid cooling of steel castings, complex part structure and large difference...

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Sand casting crack defect

The total number of cracks in the motor shell produced by furan resin sand casting process is about 70, while the total number of cracks in the motor shell produced by alkaline phenolic resin sand casting process is 30 on average, and the number of crack defects is reduced...

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Formation mechanism of hot tears casting defects

The formation mechanism of hot tears casting defects mainly includes liquid film theory and strength theory. According to the liquid film theory, when the casting is cooled near the solidus, there is still a small amount of non solidified liquid around the grain to form a liquid film. When...

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Morphology analysis of hot tears casting defects

The appearance characteristics of hot tears casting defects are that the tears propagates along the grain boundary, the appearance is tortuous, the surface has oxidation color, is not smooth, the surface is wide and the interior is narrow. It usually occurs in the hot spot where the section thickness...

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Cracks and sand inclusion defects in steel castings

The causes of cracks and sand inclusion defects in motor shell steel castings are studied from the perspective of process optimization. The research on process optimization mainly includes four aspects. ① Optimization of molding sand process in sand casting. The addition amount of alkaline phenolic resin is 1.5% ~...

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