Large horizontal axial flow pump split guide vane casting method

Abstract

The invention relates to a large horizontal axial flow pump split guide vane casting method. The method is characterized by comprising the steps of: (1) employing a foam module to make an upper half guide vane outer die and a lower half guide vane outer die; (2) designing the upper guide vane into four sand cores, designing the lower guide vane into five sand cores, and specially making a set of molding wood die universal to 1#-9# sand cores; (3) employing the upper half guide vane outer die and the lower half guide vane outer die and the universal molding wood die to manufacture sand molds, and placing coke in the sand cores; (4) pre-embedding a thick-walled seamless steel pipe at the molding position of a guide vane oil pipe hole, and inserting the seamless steel pipe into a foam outer die to fix it; (5) brushing an ISOMOL type special alcohol-based coating on a molding sand casting wall surface twice; (6) carrying out molten iron casting; and (7) controlling the heat preservation time of a casting in the sand mold over 48h. The method provided by the invention adopts the special universal molding wood die, and arranges coke in the sand cores, and employs heat preservation time prolonging and other measures, thus greatly saving the manufacturing cost of the guide vane body and improving the product quality. The method is mainly used for production of large horizontal axial flow pump guide vanes.

Description

Technical field [0001] The invention relates to the improvement of casting technology, in particular to a method for casting a large horizontal axial flow pump split guide vane body. Background technique [0002] The split guide vane body used on the large horizontal axial flow pump has a complex structure and asymmetrical properties, see figure 1 At present, the casting method is mainly used for molding, the guide vane body is large in size, the main body wall thickness is thin, the connection part of the cylinder and the guide vane is prone to cracks, the surface quality requirements are strict, and the overall casting is difficult. The casting method first is to build a sand mold. According to the structural characteristics of the split guide vane body, it is divided into two parts, an upper guide vane body and a lower guide vane body. Therefore, two sets of outer molds are required, namely the upper guide vane outer mold and the lower guide vane outer mold, and Nine sand core...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the existing guide vane body casting method that nine core boxes are needed, the processing is complicated, the manufacturing period of the wooden mold is long, the cost is high, the hole of the oil pipe cannot be cast out, and the quality of the casting product is unstable, etc., providing Casting Method for Split Guide Vane Body of Large Horizontal Axial Flow Pump

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