Method of casting thin wall water chamber for high power diesel engine

Abstract

The invention relates to the casting for the thin wall cooling water jacket of a big power diesel engine, starting with cutting with the foam block, sticking cooling water jacket mold and pouring system, spraying the shroud, using sand mold to make the inside support for the cooling water jacket, setting the integrated cooling water jacket and pouring system in the enclosed sand box with the support parts placed inside the cooling water jacket, using dry sand to complement the enclosed sand box, sealing the enclosed san box and extracting the air to negative pressure, casting iron melt, keeping the temperature of the casting piece and slowing cooling down to indoor temperature, cleaning the casting piece for inspection. Cooling water jacket make in this having deformation ratio less than 1mm, without preserving processing margin and defect after processing.

Description

Technical field [0001] The invention relates to a casting method, in particular to a method for casting a thin-walled cooling water jacket of a high-power diesel engine. Background technique [0002] Cylinder heads and cylinder liners of high-power diesel engines are in a high-temperature working environment. In order to ensure normal operation, the periphery must be cooled. The usual cooling method is to use the circulating water to absorb heat to reduce the temperature. The use of water cooling to reduce the temperature requires the installation of a special cooling water jacket outside the cylinder head and cylinder liner. The cooling water jacket must be compact and safe. Reliable, so the structural design of the cooling water jacket is unique. As shown in Figure 1, the structure of the cooling water jacket is barrel-shaped. There are several annular convex sealing surfaces on the inner wall of the cooling water jacket, and the outer wall of the cooling water jacket It has a ...

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Problems solved by technology

[0004] ①The outer circle of the cooling water jacket is deformed into an ellipse due to inaccurate quality control during the casting process, exceeding θ1004 -2 -4 In addition, due to the uneven wall thickness of the cast cooling water jacket, the application requirements cannot be met.

[0005] ②The inner circular surface of the cast cooling water jacket cannot meet the precision requirements of the application, and the required precision can only be achieved after the machining allowance is reserved before casting and the machining allowance is finished after the casting is completed. Stress release during processing will cause deformation of the finished cooling water jacket, and water leakage will occur after assembly with the cylinder

[0006] ③Screw hole protrusions and water pipe protrusions on the outer wall of the cooling water jacket have defects such as looseness and shrinkage cavities in sand casting, resulting in the scrapping of the entire cooling water jacket

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