Method for casting vermicular cast iron casting parts

Abstract

The invention discloses a casting method of cast of vermicular cast iron for heavy motor cylinder lid, which is characterized by the following: combining multiple casting techniques with 'lateral casting', 'top casting', 'flanging casting', 'insulation riser' and 'shaped hollow chill' together; reducing the defect of shrinkage loose and void and synthetic waste rate; adjusting the casting technique according to the real condition; fitting to be used on other patterned products.

Description

technical field [0001] The invention relates to a casting process of vermicular graphite cast iron castings, in particular to a casting process of vermicular graphite cast iron for engine cylinder head castings, especially a casting process of vermicular graphite cast iron for heavy-duty engine cylinder head castings. Background technique [0002] Vermicular graphite cast iron refers to a cast iron whose graphite is mostly worm-like and partly spherical. Its structure and properties are between nodular cast iron and gray cast iron, and it has good comprehensive properties. [0003] In actual production, when using compacted graphite cast iron to produce castings, defects such as shrinkage and shrinkage cavities are prone to occur, and it is difficult to obtain castings with qualified quality. Therefore, the application of compacted graphite iron castings is severely limited, and it is more difficult to apply to the casting process of engine cylinder heads with complex struct...

AI Technical Summary

Problems solved by technology

[0005] Although the use of vermicular graphite cast iron to cast the engine cylinder head can improve the performance of the product, but in the actual production process, the yield of the product is very low

The main problem is that the cylinder head leaks seriously, and shrinkage porosity and shrinkage defects are prone to occur at hot joints such as guide rod holes and bolt holes (these holes are all processed holes). After these processed holes are processed, the cast wall has Microporous penetration causes leakage, leading to product scrap

This casting process is mainly used for the casting of 6110, 4110 and other diesel engine cylinder heads. For example, it is directly used for heavy-duty diesel engine cylinder head casting. Since the problems such as shrinkage holes at the hot joints cannot be solved, the reject rate of the product is still high.

[0007] Heavy-duty engine cylinder heads (such as 6M series cylinder heads) have a relatively complex structure, and there are hot spots in important positions such as injector holes, nail holes, and valve guide rod holes. These positions have high requirements for castings. If the existing The casting process method will cause a lot of waste products

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