Casting method for vermicular graphite cast iron cylinder cover of diesel engine and cold iron core support for casting

Abstract

The invention discloses a casting method for a vermicular graphite cast iron cylinder cover of a diesel engine and a cold iron core support for casting. The casting method includes the steps that thecold iron core support matched with an injector hole in size is placed on an injector hole sand core, and the whole set of the sand core is placed in a molding flask of a molding line; at the set pouring temperature, molten iron is poured into the molding chamber of the sand core from a pouring cup of the molding flask according to the set pouring speed; the molding flask is opened and a casting is taken out when the shakeout time is set, and a casting system associated with the casting and casting sand attached on the surface are cleaned up; and the corresponding injector hole is machined atthe cold iron core support of the casting. During the solidification of the molten iron, the cold iron core support can fuse and absorb heat to eliminate the shrinkage porosity in the casting. A positioning core of the cold iron core support can be placed on the sand core to play a positioning role, and at the same time, the shrinkage porosity of the core of the casting can be eliminated, or the shrinkage porosity area can be controlled within a machining range, and the shrinkage porosity can be removed by a later machining process.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting method of a diesel engine vermicular graphite cast iron cylinder head and a cold iron core support for casting. Background technique [0002] For diesel engines, the shrinkage of the injector holes is a common problem for the cylinder heads of various models. In order to solve this problem, manufacturers usually adopt two methods: [0003] First, the injector hole is cast solid. This method is convenient to set the riser at the upper end of the injector hole, especially when the shrinkage is serious, an expensive heating riser can be set to eliminate the shrinkage. However, this method can only be used in the horizontal casting process. Due to the limitation of the size of the sand box, the heavy-duty diesel engine cylinder head using this process can only be realized in one piece, and the casting efficiency is low. Moreover, casting needs to match expensive heating ...

AI Technical Summary

Problems solved by technology

[0007] For diesel engine vermicular graphite cast iron cylinder head, there is still no suitable process to eliminate the shrinkage problem at the injector hole, resulting in a high scrap rate

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