Method for casting cylinder cover of multicylinder one-cover engine

Abstract

The invention discloses a method for casting a cylinder head of a multi-cylinder single-cover engine, which adopts a reverse deformation amount casting method and comprises the design of shape reverse deformation amount of a casting mould and a mounting structure between sand cores, wherein the reverse deformation amount of the casting mould adopts the design that the part forming the shapes of the bottom and the top of a product is designed into V-shaped, and the initial point of the design of the V-shaped reverse deformation amount takes the central point of longitudinal length of the mould as the highest point, and the design of the V-shaped reverse deformation amount takes a slope surface formed on edges at two initial ends of the longitudinal length of the mould as the lowest final point. The method for casting the cylinder head of the engine adopts a modification method of the reverse deformation amount at the proper position according to the structure of the shape of the cylinder head when designing the mould. The casting process method adopts the structure of reverse deformation shape of the mould to effectively reduce the reverse deformation of a casting, and ensures the accuracy of the shape of the casting, in particular the accuracy of the shape of an air intake and discharge passage at key parts, thereby ensuring the stability of performance parameters of the air passage. The manufacturing cost of the mould and the production cost of the casting do not change.

Description

technical field [0001] The invention relates to a casting method for a cylinder head of a multi-cylinder one-head engine, in particular to a casting method for a four-valve multi-cylinder one-head cylinder head of a multi-cylinder diesel engine. Background technique [0002] The engine cylinder head is an important component of the engine, especially for diesel engines, the four-valve cylinder head castings are the most difficult to manufacture. The length and width ratio of the casting is very different, the wall thickness of the inner cavity is thin, and the bottom surface is thick and the top surface is thin, resulting in uneven wall thickness. The structure of the water cavity is complicated. The castings are easy to bend and deform, and the machining allowance is uneven. For example, when the design machining allowance is 4mm, the larger machining allowance of the cast casting is 6-7mm, and the smaller one is less than 1mm. The shape and size of the cast castings have...

AI Technical Summary

Problems solved by technology

In the former method, due to the difficulty in the cooperation between the sand cores, the reliability of positioning is reduced, the deformability of the sand core is increased, and the possibility of structural defects in other aspects of the product is increased.

The latter approach may add to the imperfections of the rotation

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