Pouring production process used for automobile engine casting combined core

Abstract

The invention provides a box-type dry sand filling pouring production process used for an automobile engine iron casting cold core box combined core, wherein the combined core is fully filled by utilizing dry sand and auxiliary filler in a sand box having a vacuumizing structure so as to provide support for a skin core, and a measure of vacuumizing to further improve the support strength to the skin core is reserved so as to ensure that the combined core is poured in the condition of meeting the process strength requirement in the casting pouring and solidifying process, thereby realizing cooling of the casting in the box. The invention provides a new process which can conveniently solve the technical problem, can realize automatic flow line production suitable for batch production, and simultaneously can fully utilize the technical characteristics of the combined core; is strong in product adaptability, can effectively reduce equipment investment, can effectively save production and operation cost, is environment-friendly, economical, friendly in operation environment and practical, and can produce castings with high quality and high precision.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a pouring production process for a cold box combined core of an automobile engine cast iron casting. Background technique [0002] Automobile engine castings are one of the most difficult types of castings due to their complex structure, strict dimensional accuracy requirements, high requirements on surface quality and casting strength. Therefore, they have been extensively researched and developed by industry workers for many years and have achieved great results With abundant achievements, the casting process level of engine castings has been greatly developed. However, with the development and progress of the engine itself, new conditions and higher requirements are constantly being put forward for the foundry industry. [0003] The combined core of automobile engine castings is researched and developed by industry workers when the traditional technology can no longer adapt w...

AI Technical Summary

Problems solved by technology

Compared with pouring process 1, pouring process 2 has greatly reduced equipment investment costs, but greatly increased production and operation costs, so it is usually only used for products with small batches and cannot be used for mass production

The pouring process means 3 and 4 are similar, and both use metal clamps to clamp the combined core to replace the pouring process means 1 and 2 to repeat the molding (that is, when the combined core has formed the shape of the casting, re-shape, and then put The combined core is lowered into the sand mold made by re-molding), which saves equipment investment and production and operation costs. In addition to the limitations of poor adaptability to material types, poor process implementation, overflow or splashing of molten iron during pouring, the safety of operators cannot be guaranteed by itself, poor product adaptability, difficulty in realizing standardized automatic assembly line production, and inability to achieve cooling in casting boxes. There are different deficiencies in each of them: pouring process 3 is simple and extensive, the quality and precision of the castings produced are not high, the operating environment is harsh, and human factors account for a relatively large proportion; pouring process 4 has a greater improvement compared with pouring process 3 , but limited to the production of two products at the same time, and for different types of products with large size differences, different bottom plates must be used, the product has poor adaptability, and is not suitable for multi-variety production

[0006] It can be seen from the description of the background technology that the existing pouring production technologies for composite cores of cast iron castings for automobiles have their own deficiencies or limitations, and there is no technology that can solve the technical problems conveniently and can Realize automatic assembly line production suitable for mass production, and at the same time make full use of the process characteristics of combined cores, reduce equipment investment costs, effectively save production and operation costs, and avoid unnecessary repeated operations and waste

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