Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding

Abstract

The invention relates to the processing field of iron castings, in particular to a technique for producing large and medium-sized cylindrical iron castings through a clay green sand molding. The technique achieves the application of the clay green sand molding process in the production and processing of the large and medium-sized iron castings, and is achieved through the following technical steps: molding sand preparation, modeling, core making, mold assembling, teeming, shakeout, cleaning, inspection and repair. The core making comprises the steps as follows: 1, designing a sand core structure, wherein the sand core is designed to be provided with a through hole structure or a blind hole structure in an axial direction, so that a cavity type structure is formed; 2, drawing drawings of an internal mold and an external mold; 3, adopting a steel plate to produce the internal mold and the external mold, wherein a plurality of exhaust through holes are formed uniformly in the internal mold; and 4, producing the cavity sand core. The technique provided by the invention is reasonable, simple, and convenient to implement; moreover, the implementation meets the requirements for energy conservation and emission reduction, the production cost can be saved effectively, the production technology process can be shortened, the production efficiency can be improved, and the economic benefits of enterprises can be increased; and the technique is mainly used for producing iron castings provided with the cylindrical characteristic such as middle-segment, bottom-segment castings and the like of a carbon disulfide gasification reacting furnace.

Description

technical field [0001] The invention relates to the field of sand mold casting, in particular to a process method for producing large and medium-sized cylindrical iron castings by clay green sand molding. Background technique [0002] Clay sand casting is a common processing method for iron castings. Among them, clay dry sand casting is the main production method for large and medium-sized iron castings. The process flow is: sand preparation—molding—core making—mold (core) drying—boxing - Pouring - Shakeout and cleaning - Casting quality inspection and defect repair. The core (i.e. the outer sand mold and sand core) in the process needs to be dried in a coal-fired drying kiln. The heating time is long, so the energy consumption is high, and it will Cause serious pollution to the environment; with a volume of 50m 3 Take the core coal-fired drying furnace as an example, the coal consumption is about 100㎏ / h, each time the core is baked for 10 hours, about 1.0 tons of coal is n...

AI Technical Summary

Problems solved by technology

Although with the advancement of science and technology, the production of large and medium-sized iron castings can be realized by using techniques such as self-hardening sand molding, lost foam molding, and V-method molding without drying the core in a kiln, but these processes require large investment in equipment and production. High cost, not suitable for production and processing of general iron castings

Clay green sand casting is the main production method of small and medium-sized iron castings. Compared with clay dry sand casting, it has low process cost and low energy consumption, and has relative competitive advantages. However, it has not been applied to the production of large iron castings at present. The reason is that the core will inevitably generate gas during the pouring process of the casting (the moisture in the core will inevitably generate gas when it is heated), which will generate pores on the surface of the iron casting, which will undoubtedly have a certain impact on the quality of the casting product

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