Method for casting hub casts of aerogenerators

Abstract

The invention discloses a method for casting hub casts of aerogenerators, comprising the steps of mould manufacture, the manufacture of sand moulds and moulding by pouring. During the manufacture of sand moulds, an ingate is designed into a disc shape and is arranged in the center of the bottom surface on the lower end of a cast mould cavity; a bottom pouring type pouring system is adopted; a sprue is a quantitative ladle stopper pouring sprue; the ratio of the areas of the sprue to a runner to the ingate to a side runner is 1 to (2.60 to 3.10) to (1.0 to 1.2) to (4.0 to 6.0); and the moulding by pouring is operated under the following conditions: the taphole temperature of iron liquor is from 1420 DEG C to 1500 DEG C; the magnesium explosion time is from 1.20 minutes to 5.00 minutes; the pouring temperature is controlled from 1280 DEG C to 1350 DEG C; and the pouring time is from 50 seconds to 90 seconds. By adopting the method, a large cast is not easy to deform or to produce a shrinkage hole, shrinkage porosity or entrapped slag, and the rate of finished products is high.

Description

technical field [0001] The invention relates to a casting method of a casting, in particular to a casting method of a hub casting of a wind power generator. Background technique [0002] With the advancement of science and technology and the needs of industrial development, the application of large castings is becoming more and more extensive, and the demand is also increasing. Recently, the applicant unit accepted the pouring task of the hub casting of the wind turbine. The overall unit weight of the casting is 8 tons, and the external dimensions are 2212mm×2734mm×2368mm. Intrinsic quality requirements for defects such as air gaps and cracks. To complete the pouring of such castings, the design of the gating system is particularly important. If the traditional gating system is used, it is obviously impossible to meet the requirements. This is because the traditional gating system design is usually closed and open in two ways: the cross-sectional area of ​​the sprue, runne...

AI Technical Summary

Problems solved by technology

To complete the pouring of such castings, the design of the gating system is particularly important. If the traditional gating system is used, it is obviously impossible to meet the requirements

This is because the traditional gating system is usually designed in two ways: closed and open: the cross-sectional area of ​​the sprue, runner, and ingate of the closed gating system gradually decreases, the flow rate of the molten metal is fast, and the turbulence is serious. It is easy to wash the mold, causing air entrainment and inclusion defects; the cross-sectional area of ​​the sprue, runner, and ingate of the open gating system is gradually enlarged, resulting in a large air gap in the runner when the molten metal is filled. The gas interacts with the molten metal to form an oxide film, and the gas and oxide film are involved in the molten metal, becoming the source of cracks and shrinkage, making the casting prone to cracks and shrinkage defects

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