Mould and casting method of solid solution strengthened ferritic nodular cast iron wind power casting

A solid solution strengthening, ductile iron technology, applied in the direction of casting molds, casting mold components, casting molding equipment, etc., can solve the problems of inability to mass-produce wind power castings, poor flow performance of molten iron, large shrinkage tendency, etc., to avoid cold The effect of separation and slag inclusion defects, stable iron feeding and reasonable distribution

Pending Publication Date: 2018-07-24
JIANGSU JIXIN WIND ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, from the perspective of development, compared with ordinary materials, cast silicon solid solution strengthened ferritic nodular cast iron materials have poor iron flow properties, and have certain uniqueness and complexity in smelting technology, molding technology, etc., especially When using this material to cast wind power castings with large size and complex structure, there are problems such as large slag inclusion tendency and greater shrinkage tendency, which make the wind power castings of this material unable to be mass-produced. Therefore, there is an urgent need for casting wind power castings of this material. Improvement of casting process

Method used

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  • Mould and casting method of solid solution strengthened ferritic nodular cast iron wind power casting
  • Mould and casting method of solid solution strengthened ferritic nodular cast iron wind power casting
  • Mould and casting method of solid solution strengthened ferritic nodular cast iron wind power casting

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Effect test

Embodiment 1

[0052] Example 1 The casting mold of the wind power base

[0053] figure 1 Shown is a GE3.2MW-130 combined base, including a bottom flange 11, a special-shaped curved surface 12, and a hub installation ring 13. side. The weight of the wind power base is about 18.17T, the maximum size is 4042mm*3600mm*3010mm, the main wall thickness is 70-200mm, and the material is QT600-10.

[0054] Taking the above-mentioned GE3.2MW-130 integrated base (QT600-10) as an example, the casting mold of solid solution strengthened ferritic ductile iron wind power castings designed by the present invention includes sand boxes, sand molds and cores. The sand mold is formed by falling sand into the sand box, then puts the core into the box, and forms the mold after closing the box. The casting mold is provided with: a casting cavity 21 , a pouring system 22 and a heating system 23 . Casting cavity 21, gating system 22 and heating system 23 are used as the internal structure, which is composed of s...

Embodiment 2

[0055] Embodiment 2 Use the mold of Embodiment 1 to cast GE3.2MW-130 fit base (QT600-10)

[0056] Casting steps:

[0057] (a) Smelting molten iron

[0058] Furnace charge: 40-50% new iron, 30-40% recycled charge, 10-20% steel scrap.

[0059] Further, the new iron is high-purity pig iron, wherein C: ≥ 4.0%, Mn: ≤ 0.10%, P: ≤ 0.025%, S: ≤ 0.015%, and the sum of harmful alloy elements due to anti-spheroidization ≤ 0.08%; The steel scrap mentioned above is thin flake carbon steel scrap, wherein C: ≤0.15%, Mn: ≤0.40%, P: ≤0.03%, S: ≤0.03%.

[0060] Smelting the burden into molten iron; adjusting the composition of the charge through spectral analysis to control the carbon equivalent in the molten iron: C: 3.4% to 3.5%, Si: 3.7% to 4.0%, Mn: 0.1% to 0.35%, P: <0.04%, S : ≤0.012%, Mg: 0.04% ~ 0.07%, Cr: <0.05%, Ti: <0.03%;

[0061] (b) Spheroidization treatment and inoculation treatment

[0062] Select a low-rare-earth ferrosilicon-magnesium alloy nodulizer (50% Elkem 5813+50% s...

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Abstract

The invention discloses a mould and a casting method of a solid solution strengthened ferritic nodular cast iron wind power casting. The mould comprises a sandbox, a sand mold and a core. A cavity structure formed by combining the sand mold with the core comprises: a casting cavity arranged in the mould, wherein the shape of the casting cavity fits the profile of the wind power casting, and the casting cavity is provided with a plurality of risers; a casting system, wherein the casting system comprises at least one iron inlet, at least one molten iron main runner, a central shunting chamber, aplurality of molten iron sub-runners and a plurality of filters; and a warming system, wherein the warming system comprises a plurality of hot air channels, and the hot air channels are arranged above the casting cavity in a communicating manner. The casting system in the mould is reasonably distributed, the plurality of molten iron sub-runners greatly shortens the casting time and ensures stableiron feeding, and the filters are used to effectively avoid the defects of cold shut and slag inclusion of the casting. The arrangement of the risers ensures the riser feeding of the cavity.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a casting mold and a casting method of a solid-solution strengthened ferritic nodular cast iron wind power casting. Background technique [0002] At present, with the intensification of competition in the wind power market, wind power manufacturers are developing high-power generating sets on the one hand, and controlling manufacturing costs on the other. High-strength wind power material. [0003] Si is the most commonly used element in cast iron, which can strengthen ferrite and increase the strength of ferrite. But it has been thought that Si makes ductile iron brittle. In 1949, Mills applied for the first patent of ductile iron in the United States, and believed that increasing the amount of w(Si) (>2.5%) could significantly reduce the mechanical properties, especially the toughness, tensile strength and ductility. In actual production and subsequent researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22B22C9/08B22D27/04B22D27/20C22C33/08C21C1/10
CPCC21C1/10C22C33/08B22C9/02B22C9/082B22C9/22B22D27/04B22D27/20
Inventor 季虎陈玉芳王卫国赵栋张晶颜夕文
Owner JIANGSU JIXIN WIND ENERGY TECH
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