Method for producing cylinder cover of compressor of heavy duty truck

Abstract

The invention discloses a method for producing a cylinder cover of a compressor of a heavy duty truck, and adopts a box-free vertical molding line continuous manufacturing technology. The technology comprises the following steps: (1) using a core shooter to prepare a sand core, and assembling the prepared sand core into the whole shell mold of a forming casting; (2) preparing a sand mold on the production line with a molding external mold, that is, preparing a cavity for placing the whole shell mold of the forming casting and a sand mold for placing a concreting system; and 3), lowering the whole shell mold of the forming casting into the sand mold with well made molding line to cast the forming casting. The method has the advantages that the dosage of the precoated sand can be effectively reduced, so as to reduce the total gas emission quantity produced by the precoated sand during casting; and due to the high pressure head of the casting system, the casting can bear high pressure, the compactness of the whole casting is favorable, and particularly, air leakage caused by casting defects such as loose materials and cold shut on the thin wall of the inner cavity during pressure testing can be effectively reduced. According to the method, production efficiency of automated equipment can be effectively improved, and the qualified rate of the casting can be improved.

Description

technical field [0001] The invention relates to a casting molding method, which belongs to the field of casting technology, in particular to a combination of a shell mold (casting molding) and a green sand mold (riser system) on a vertical production line to produce a heavy-duty truck compression The method of the cylinder head. Background technique [0002] Under normal circumstances, the structure of the inner cavity of the cylinder head is quite complicated, and the thinnest part of the wall thickness is only 6mm. It is also required that no leakage occurs under the pressure of 8 MPa and the cleanliness of the inner cavity does not exceed 80 mg. The production line adopts different methods for product development. The cylinder head processing technology on the production line is generally: die-casting first, removing the handle after blanking, then rough machining the hexahedron, and then finishing the hole position and shape, so that rough machining and fine machining T...

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Problems solved by technology

[0003] However, it usually requires repeated experiments, and most of them give up the development because the scrap rate is too high or the manufacturing cost is high.

Moreover, during production, the overall shell shape requires a large amount of coated sand, the casting cost is high, the core setting is difficult, and the production efficiency is slow. Above the horizontal line, such a large amount of shell-shaped gas generation is very detrimental to the quality of the cylinder head castings, especially the waste products such as casting pores

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