Casting technique of V12-type engine cylinder block

Abstract

The invention discloses a casting technique of a V12-type engine cylinder block. The casting technique comprises the following steps of: manufacturing a foam model, modeling under vibration, pouring under vacuum and cooling and cleaning, wherein a sand mould is subjected to air exhaust during a pouring process and before and after the pouring step, an air exhausting pipeline is arranged at the lower end of the sand mould, an iron pillow for dispersing force is arranged on a pouring cup, a layer of water glass sand is coated on a film, a vibrating platform is started before pouring, and a sand box can continuously vibrate in the pouring process. The V12-type engine cylinder block with a complicated structure is manufactured by adopting an improved evanescent mode casting technique and a vibrating-while-pouring compact strengthening casting method, shape-position dimensional accuracy and internal-external surface quality of the V12-type engine cylinder block are further improved by the allowance-free and accurate forming evanescent mode technique, an ideal compact organization structure is obtained by virtue of the vibrating-while-pouring compact strengthening casting method, and the performance of the V12-type engine cylinder block can be guaranteed and improved.

Description

technical field [0001] The invention relates to the engine block manufacturing technology, in particular to the casting technology of a V12 engine block. Background technique [0002] The cylinder block is the main part of the engine, with complex structure and thin wall. The lost foam casting (EPC) technology enables such products to achieve "integration, light weight and precision", and the lost foam casting is used for mass production of cylinder castings, the cost is relatively low, and the appearance and internal quality of the produced castings are relatively high. it is good. However, due to the complex structure of the cylinder body, it is difficult to produce the cylinder body by the lost foam casting process. It is mainly reflected in the following aspects: casting molding and poor shape and size, the geometry of cylinder block castings determines that its model segmentation is more complicated; it is necessary to ensure that the air passages, water passages and ...

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the cylinder body, it is difficult to produce the cylinder body by the lost foam casting process.

It is mainly reflected in the following aspects: casting molding and poor shape and size, the geometry of cylinder block castings determines that its model segmentation is more complicated; it is necessary to ensure that the air passages, water passages and oil passages of the cylinder block are free from leakage and sand sticking , the inner cavity is clean, no paint, dense structure, etc.; the wall thickness of the castings is very different, and it is easy to cause excessive stress during the shrinkage process, forming cracks and loosening of the hot joints; The minimum part is only 4mm, and it is difficult to fill the molding sand. If the filling is not solid, the molten iron will seep out during pouring, forming iron-clad sand that is difficult to remove, etc.

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