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Blow hole defect of wet molding clay sand steel casting

The blow hole defects produced by wet molding clay sand cast steel process are mainly intrusion blow hole and precipitation blow hole. Intrusive blow hole defect is that gas intrudes into liquid metal from the outside, mainly from molding sand, core sand, cold iron, etc., or may be involved...

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Avoid shrinkage cavity and porosity defects of steel castings

Many parts of construction machinery such as bulldozers and excavators are cast steel castings, which often have shrinkage defects. Light shrinkage and porosity will increase the cost of repair and inspection, and heavy shrinkage and porosity defects will lead to the scrapping of steel castings. Combined with the actual...

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Shrinkage cavity and porosity defect of steel castings

The defects of shrinkage cavity and porosity are briefly introduced. Combined with the theories of filling capacity of liquid metal, solidification mode of steel castings and shrinkage of steel castings, the process design of traditional steel castings is carried out by taking the accessory bracket of a construction machinery...

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Control of shrinkage cavity and porosity defects of steel castings

Different steel casting production processes determine different production processes, but they can be basically divided into process design, model making, molding and core making, lower core box, smelting and pouring, sand falling, gas cutting and gouging, heat treatment, grinding and cleaning, inspection and other processes. The shrinkage cavity and...

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Technology of sand casting of steel castings for boom

1.Problem description Sand casting boom steel casting, steel casting No. 322232642, is an accessory of atlas process engineering machinery rock drill in the Netherlands. During the sampling inspection of small batch production after the preliminary trial production is qualified, it is found that some products have shrinkage defects locally,...

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Quality inspection items of railway steel castings

Inspection and test are important means to ensure the quality of steel castings and the process quality of steel castings. In the production process of coupler, in addition to the inspection of raw materials, the real-time monitoring of various process parameters of medium sand in sand treatment system, and...

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Analysis of casting defects of steel castings

The steel castings were trial produced in two batches, and the first time was qualified, and the second time there was shrinkage cavity and porosity defect. After investigating the five aspects of personnel, machines, materials, methods and links, since there are no abnormal changes, it is inferred that the...

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