One-box two-casting casting technology of marine diesel engine cylinder cover casting

Abstract

The invention is mainly applied to the technical field of engines, and particularly relates to a one-box two-casting casting technology of a marine diesel engine cylinder cover casting. The one-box two-casting casting technology is characterized by comprising the following steps that (1) a pouring system is medium pouring type, a casting outer mold sand mold adopts a horizontal parting surface; (2) left and right cylinder cover sand molds are in central symmetry; (3) locating pins and locating holes are manufactured on the adjacent side surfaces of a cylinder cover lower half outer mold sandmold; (4) after a lower core is combined, sand molds of left and right cylinder covers are sequentially placed into a sand box; (5) a gap between the sand box and the outer mold sand mold is filled with waste sand; and (6) during casting, a pouring cup is maintained in a full state till pouring is completed. According to the one-box two-casting casting technology, an upper half outer mold sand mold does not need to be provided with an overflow air out riser again, dimension of a static pressure head is increased, and liquid feeding of the casting is facilitated; and the left and right cylindercover sand molds are in central symmetry, a symmetry center is confirmed, and the left and right cylinder cover sand molds are combined through the locating pins and the locating holes.

Description

technical field [0001] The invention relates to a two-piece casting process for a cylinder head casting of a marine diesel engine, which is mainly used in the technical field of engines. Background technique [0002] At present, the casting blanks of marine diesel engine cylinder heads are basically made of nodular cast iron and vermicular graphite cast iron. In order to prevent the internal shrinkage of the castings, resin sand or coated sand molding processes with high sand mold strength are mostly used in production. Resin sand molding is difficult to mechanize, and it is more suitable for cylinder heads of large size and small batches. Coated sand molding has a high degree of mechanization and is more suitable for large quantities of small-sized cylinder heads. However, when the coated sand molding is applied to the cylinder head casting, generally only part of the sand core is made. When it is applied to all the sand cores and the outer mold sand mold, it is still nece...

AI Technical Summary

Problems solved by technology

The resin sand or clay sand mold of this jacket still needs to make molds and special sand boxes. The cost of molds and tooling in the early stage is relatively large, and sand mold costs will also be incurred in later production.

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