Casting structure and method for diesel engine cylinder cover core assembly vertical casting process sand core combination

Abstract

The invention discloses a casting structure and method for a diesel engine cylinder cover core assembly vertical casting process sand core combination. The structure comprises tray cores on the two sides, lower water jacket cores arranged on the tray cores on the two sides, exhaust passage core seats arranged on the tray cores on the two sides, exhaust passage cores arranged on the tray cores on the two sides and the exhaust passage core seats, air inlet passage cores arranged on the tray cores, upper water jacket cores arranged on the lower water jacket cores, a left top cover core and a right top cover core, wherein the left top cover core and the right top cover core are arranged on the tray cores on the two sides respectively, the left top cover core and the right top cover core are matched with the tray cores on the two sides to form the shape of the top face of a cylinder cover; and all sand cores are compressed through a compressing device, the casting structure of the sand core combination is formed, and two cylinder covers can be formed at a time. The size precision, the process yield and the inner cavity quality of the cylinder covers are improved.

Description

technical field [0001] The invention relates to the technical field of diesel engine cylinder head casting, in particular to a casting structure and method of a diesel engine cylinder head core-clad vertical casting process sand core combination. Background technique [0002] At present, the diesel engine cylinder head casting process mainly adopts the following methods: [0003] 1. Using the flat pouring process, the top surface of the cylinder head is on the upper box, the combustion chamber surface is on the lower box, and the top and bottom surfaces are formed by green sand molds. It is difficult to control the stability and consistency of green mold sand, which affects the dimensional accuracy of castings; [0004] 2. The top surface area of ​​the cylinder head cavity is large, and it is baked and impacted by high-temperature molten iron for a long time during the pouring process, resulting in many casting defects such as sand drop and sand inclusion in the cylinder hea...

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Problems solved by technology

[0003] 1. Using the flat pouring process, the top surface of the cylinder head is on the upper box, the combustion chamber surface is on the lower box, and the top and bottom surfaces are formed by green sand molds. It is difficult to control the stability and consistency of green mold sand, which affects the dimensional accuracy of castings;

[0004] 2. The top surface area of ​​the cylinder head cavity is large, and it is baked and impacted by high-temperature molten iron for a long time during the pouring process, resulting in many casting defects such as sand drop and sand inclusion in the cylinder head;

[0005] 3. The structure of the cylinder head determines that the water jacket core and the airway core have a large width-to-height ratio. During the pouring process, the buoyancy of the molten iron is relatively large, resulting in unstable dimensional accuracy of the cylinder head, and the casting is prone to "bow back" deformation;

[0006] 4. The inner cavity is washed by molten iron for a long time, and it is easy to stick sand;

[0007] 5. There are many high points on the top surface of the cylinder head, there are many exhaust risers, and the process yield is low, which is not conducive to reducing the cost of castings;

[0008] 6. The core assembly method cannot be automated and intelligent, and the labor cost is high

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