Method for casting thick-wall nodular iron casting of blower in power plant

Abstract

The invention relates to a method for casting a fine structure of a thick-wall nodular iron casting, in particular to a method for casting the thick-wall nodular iron casting of a blower in a power plant, which comprises the steps of core bar manufacturing, core manufacturing, molding, mould assembling, pouring and sand falling and cleaning; the invention provides the method for casting the thick-wall nodular iron casting of the blower in the power plant; and the process method is unique, can improve the success ratio of sand core production, reduce the difficulty of core manufacturing and solve the problem that sand is adhered in pores.

Description

technical field [0001] The invention relates to a casting method of fine structure of thick-walled nodular iron parts, in particular to a casting method of thick-walled nodular iron parts of power station blower. Background technique [0002] Due to the high strength of furan resin sand, usually, some small inner cavity structures can be made as a whole, thereby improving production efficiency. But there are still some problems in some special cases. For example, the blower thick-walled ductile iron parts mentioned in the present invention have a diameter of 1800mm and a wall thickness of 50-100mm. There are φ28 holes and 60 φ14 holes, and there are 30 φ28 holes and 30 45×8 flat holes inward. In casting production, the structure of the sand core is very complicated and the production is very difficult. At present, there are two conventional methods for producing this product. One method is to place the spokes horizontally, with a total of 2 cores. The spokes and shaft hole...

AI Technical Summary

Problems solved by technology

During the trial production process, 4 pieces of sand cores with inner cavity were produced before barely 1 sand core met the requirements for use. The other sand cores were scrapped due to the breakage of the small holes, and the barely produced castings were also due to the formation of small holes. The sand core is sintered and stuck to sand and scrapped

Another process method is the same as the first method for the spokes and shaft holes. The sand cores forming the inner cavity of the wheel rim and all the small holes are made in blocks, and each small block forms a section of the inner cavity and the same as the inner and outer parts. Small holes, which generally require as many as 30 small sand cores, this method can ensure that the small sand cores are not easily damaged during the production process, but the biggest problem is that due to the combination of multiple cores, it is difficult to guarantee the angular size tolerance and three-dimensional direction Dimensional tolerance