Casting forming process for large wind power planetary carrier

Abstract

The invention discloses a casting forming process for a large wind power planetary carrier casting. The planetary carrier casting comprises an upper annular plate and a lower annular plate which are vertically connected with triangular vertical columns, and a parting face of the planetary carrier casting is arranged on the interfaces of the upper annular plate and the triangular vertical columns;a first sand core and a second sand core are arranged between the upper annular plate and the lower annular plate, a triangular air outlet channel is formed in the outer sides of the sand cores, and vertical air outlet channels are formed in the centers of the sand cores; open risers are arranged right above the intersections of the upper annular plate and the triangular vertical columns, blinderrisers are arranged on the lower annular plate, and external chills are arranged under the lower annular plate. Pouring is carried out by adopting combined pouring mode of bottom-back pouring gates and stepped pouring gates. The planetary carrier produced by the method is good in forming and qualified in size, the matric structure of the casting is compact, joint parts of the triangular verticalcolumns and the upper annular plate and the lower annular plate has no crack defect, the other parts only need to undergo modification repair welding, the production cost of the casting is reduced, and higher economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment casting, in particular to a large-scale wind power planetary casting molding process with well-formed castings, dense matrix structure and no crack defects. Background technique [0002] Global offshore wind turbines are showing a trend of large-scale, and my country's offshore wind power is in its infancy. It is used for 5MW and above high-power land and offshore wind power generation equipment. The power of a single unit is high, and the unit is required to be maintenance-free for 50 years. The planet carrier product is an important part of the wind turbine, and its quality directly affects the service life of the entire generator. Planetary carrier castings belong to the frame structure as a whole, the shrinkage resistance in the vertical direction is large, the shrinkage is not easy to control, and the dimensional accuracy of the castings is difficult to guarantee; shrinkage stre...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a large-scale wind power planetary frame casting molding process to solve: the planetary frame castings have isolated, scattered, and many hot spots, feeding is difficult, and it is difficult to obtain a dense structure; The resistance is large, the amount of shrinkage is difficult to control, and the dimensional accuracy of castings is difficult to guarantee; and shrinkage stress is generated due to hindered shrinkage during shrinkage, which can easily lead to cracks and make the quality of castings fail to meet the requirements.

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