The Research Of 226B Ⅱ Cylinder Head Casting Technology

226B diesel engine is the main product of WeiChai Deutz factory,and its quality has effects on the image and reputation of WeiChai.cylinder head is one of the important parts in a engine, so needs high capability。Cylinder head's structure is complicated,the thickness of the casting wall is asymmetric,and the least thickness is only 5mm,so it is hard to control its quality and the reject rate is always high.The main work of this study is,ayalysing the reason of reject,putting forward the improving methods,and advancing the quality of castings.This article through to the resin sand of cold box cores, coated sand hair to choke the influence of porosity gas and materials of hair to choke porosity gas speed the influence of a large number of experimental, found the main factors of influence stomatal defects depends not only on the hair's volume, the hair gas speed is also a major factor. When the hair of materials the decency, if the hair gas speed is larger also, in casting mold ago release all finished, the casting is formed not easily also choke stomatal defects.At the same time, also carried out the location of internal sprue, pouring temperature and casting speed on the influence of porosity defects. The results found that the open gating system and high temperature of the cylinder head such series casting prevent blow hole defects is best.In addition, the casting of the structure, core of the head's exhaust to produce stomatal defects have certain effect. Through the improvement of s structure, make it smooth exhaust, to prevent blow hole defects as well as in effect. In the improvement of structure's at the same time, it's the accurate positioning also improved, and solve the processing process often appear "partial's", sintering cause water chamber's illogical defects.