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Wheel hub of wind turbine generator system (WTGS)

A hub and wind power technology, applied in the field of wind turbines, can solve the problems affecting the use effect of the hub, the influence of the appearance quality of castings, and the inequality of cold iron, so as to ensure the integrity of the appearance, promote the graphitization effect, and reduce the production cost. Effect

Active Publication Date: 2011-12-07
宁波日星铸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the constituent elements of the existing wheel hub castings, surface defects such as shrinkage porosity, shrinkage cavities, inclusions, pores, sand holes, and sand holes often appear in the castings, which seriously affect the use effect of the hub, and antimony and other expensive materials are also used. Metal, therefore, increases the production cost; in order to make up for the defects caused by the limitation of the constituent elements, the production process adopts placing chilled iron on the blade mounting surface of the hub to control shrinkage and obtain directional solidification, but the placement of a large number of chilled irons, due to Through artificial placement, the unevenness of the cold iron not only has a great impact on the appearance quality of the casting, but also causes a large difference in the weight of the casting, which affects the use effect

Method used

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  • Wheel hub of wind turbine generator system (WTGS)
  • Wheel hub of wind turbine generator system (WTGS)
  • Wheel hub of wind turbine generator system (WTGS)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mold manufacturing: In order to achieve the wall thickness in line with the requirements of the drawings, and at the same time facilitate the controllability of the solidification process during pouring, and avoid the occurrence of shrinkage porosity and shrinkage defects, all our molds use CNC machining centers (industry conventional technology ) manufacturing, to ensure that the wall thickness tolerance of the casting is within 2mm, and there is no artificial manufacturing of new hot pitch circles;

[0025] (2) Sand mold manufacturing: a fully open bottom pouring gating system is adopted, the inner runner 7 is designed as an inverted cone shape with a width of 20mm and a circle of draped seams, and the sprue 1.1 at the upper end of the upper sprue 1 is poured with quantitative package plugging At the highest point of the casting 10, place an appropriate amount of flat air outlet 9 (rectangular air outlet, used to discharge the gas in the mold), and the ratio of eac...

Embodiment 2

[0029] The chemical composition of the prepared sample is: carbon (the carbon equivalent is controlled at 4.65) 3.9%, silicon 2.3%, manganese 0.16%, phosphorus 0.015%, sulfur 0.014%, magnesium 0.05%, tin 0.08%, rare earth 0.025%, the preparation method is the same as the example 1.

Embodiment 3

[0031] The chemical composition of the prepared sample is: carbon (the carbon equivalent is controlled at 4.65) 3.85%, silicon 2.18%, manganese 0.15%, phosphorus 0.019%, sulfur 0.013%, magnesium 0.045%, tin 0.075%, rare earth content 0.02%, and the balance is iron .

[0032] The preparation method of embodiment 2-3 is the same as embodiment 1.

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Abstract

The invention discloses a wheel hub of a WTGS, and the wheel hub is characterized by comprising by weight: 3.80%-3.90% of carbon, 1.8%-2.3% of silicon, less than or equal to 0.3% of manganese, less than or equal to 0.02% of phosphor, 0.01%-0.015% of sulfur, 0.04%-0.06% of magnesium, 0.02%-0.08% of tin, 0.015%-0.025% of rare earth, and the balance iron, with the carbon equivalent controlled within 4.40-4.66. Without the surface defects of dispersed shrinkage, shrinkage cavity, inclusion, pore, sand inclusion, sand hole and the like, the wheel hub of a WTGS in the invention has a low manufacturing cost, and can effectively control shrinkage and obtain proportional solidification without putting a cold iron.

Description

technical field [0001] The invention relates to the technical field of wind power generator sets, in particular to a wind power hub. Background technique [0002] Wheel hub castings are large and complex parts in wind turbines (such as JF1500 hub castings, casting grade: QT400-18AL, casting weight: 7300kg, maximum casting size: 2600×2300×1710㎜), it is a number of parts The carrier of the components is the key component of the wind turbine, and it is suitable for complex and variable loads during operation. Therefore, the requirements are extremely strict, and the quality of the hub is one of the bottlenecks restricting the development of wind power above the MW level. However, due to the limitation of the constituent elements of the existing wheel hub castings, surface defects such as shrinkage porosity, shrinkage cavities, inclusions, pores, sand holes, and sand holes often appear in the castings, which seriously affect the use effect of the hub, and antimony and other exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10
Inventor 赵益锋张建中柯洪国詹善国陈国海
Owner 宁波日星铸业有限公司
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