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Zhao H.-R.,FAW Foundry Co. | Bian Q.-Y.,FAW Foundry Co. | Chen Y.-S.,Beijing Foton Environmental Engine Co.
Zhuzao/Foundry | Year: 2012

The influence of a great deal of intermixed resin sand in molding sand system for cast iron on molding sand granularity, effective bentonite content, and burning-on resistance were discussed in this paper, and some responsive methods were brought forward. In term of molding sand systems in First Foundry of our company, the change of materials in molding sand system for gray cast iron and influence of intermixed resin sand on gas evolution for molding sand were introduced in detail. A technical innovative method for molding sand treatment process was brought into effect successfully, in which new sand in molding sand system for ductile iron were replaced by used sand from molding sand system for gray cast iron. This innovative method made not only the cost and casting defects decrease, but molding sand properties to be more stable. Our experiences in practices have proved that the granularity of core sand should be conformity with that of molding sand; the resin membrane of intermixed resin sand can play a role of preventing cast iron castings from burning-on in some degree; supplement of a proper amount of used sand to molding sand system is favorable to stabilizing molding sand system; it is an effective way to stabilize molding sand system to control effective bentonite content and effective additives content well in molding sand when a great deal of resin sand were intermixed to molding sand system.


Kong Y.-J.,Beijing Foton Environmental Engine Co. | Li X.-H.,Beijing Foton Environmental Engine Co.
Zhuzao/Foundry | Year: 2010

The dispersed shrinkage easily occurs in heavy section Perkins4100 cylinder castings and the hardness of the casting is on the low side. To solve these problems, following measures were taken such as the control and optimization of raw materials, enhancing the quality control of iron melt in duplex melting, adjusting and optimizing the melting process, improving the inoculation technology, applying the rapid detection technology of blast furnace, intensifying the quality inspection of the casting, and so on. Finally, the hardness of Perkins4100 cylinder block meets the requirements, and the dispersed shrinkage defects in heavy section were eliminated.


Li X.-H.,Beijing Foton Environmental Engine Co. | Kong Y.-J.,Beijing Foton Environmental Engine Co. | Lu L.,Beijing Foton Environmental Engine Co. | Bai G.-Y.,Shenyang Honbase Machinery Co.
Zhuzao/Foundry | Year: 2010

The effects of inoculant addition amount on white width and the final content of silicon in the triangular test piece were investigated, by which to study the influence of inoculant addition on the tensile strength of test bars. The correct addition of the inoculant was determined, and stable the mechanical properties of engine castings were obtained finally.

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