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Production method of spheroidal graphite cast iron for planet carrier

A nodular cast iron and production method technology, which is applied in the production field of nodular cast iron for planetary frames, can solve the problems of easy deformation of castings, poor mechanical properties of planetary frames, and high cost, and achieve the goals of improving purity, enhancing desulfurization effect, and increasing absorption rate Effect

Active Publication Date: 2014-01-01
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a key component of a wind turbine, the planetary frame must be strong enough to withstand the environmental impact. However, as the wall thickness of the casting increases, the graphite morphology and matrix structure of the ductile iron casting will deteriorate. Therefore, the current There are technologies that require later heat treatment to ensure that the ductile iron planetary carrier castings meet the requirements of mechanical properties, but heat treatment brings problems such as complex operation, high energy consumption, high cost, and easy deformation of castings, while the existing technology adopts cast state production way to obtain poor mechanical properties of the planetary carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Pig iron, recycled materials, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingots are used as raw materials, cupola-electric furnace double smelting is adopted, and nodularization is carried out by the rush-in method. The nodularizer is rare earth magnesium ferrosilicon alloy, adding The amount is 0.85% of the total weight of the molten iron, and the flow rate of the molten iron into the spheroidizing bag is increased, so that the spheroidizing reaction is completed within 68s; multiple inoculation techniques are adopted, and 75 ferrosilicon inoculants are used for inoculation when tapping the iron. The particle size is 3-8mm, and the amount added is 0.2-0.6% of the weight of molten iron. Before pouring, silicon-calcium-barium inoculant is used for inoculation with flow. The particle size is 0.2-1mm, and the amount added is 0.1% of the weight of molten iron. Ferrosilicon inoculation blocks are inoculated in the mold, and the addition amoun...

Embodiment 2

[0022] Pig iron, recycled materials, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingots are used as raw materials, cupola-electric furnace double smelting is adopted, and nodularization is carried out by the rush-in method. The nodularizer is rare earth magnesium ferrosilicon alloy, adding The amount is 0.90% of the total weight of the molten iron, and the flow rate of the molten iron into the spheroidizing bag is increased, so that the spheroidizing reaction is completed within 60s; multiple inoculation techniques are adopted, and the number of inoculations is controlled at 4 times, including inoculation and inoculation in the mold. Incubate with flow; finally make molten iron composed of the following weight percentages: C 3.58%, Si 2.09%, Mn 0.31%, P 0.028%, S 0.011%, Cu 0.73%, Sb 0.011%, Re 0.014%, Mg 0.041%, the balance is iron. Let the molten iron stand at 1309°C, pour the planetary carrier casting body, standard test block and super stan...

Embodiment 3

[0027] Pig iron, recycled materials, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingots are used as raw materials, cupola-electric furnace double smelting is adopted, and nodularization is carried out by the rush-in method. The nodularizer is rare earth magnesium ferrosilicon alloy, adding The amount is 0.90% of the total weight of the molten iron, and the flow rate of the molten iron into the spheroidizing bag is increased, so that the spheroidizing reaction is completed within 64s; the multiple inoculation technology is adopted, and the number of inoculations is controlled at 3 times, including inoculation and inoculation in the mold. Incubate with flow; finally the molten iron is composed of the following weight percentages: C 3.60%, Si 2.12%, Mn 0.2%, P 0.02%, S 0.009%, Cu 0.8%, Sb 0.01%, Re 0.011%, Mg 0.035%, the balance is iron. Let the molten iron stand at 1305°C and pour the castings.

[0028] After the casting is cooled, the performan...

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Abstract

The invention provides a production method of spheroidal graphite cast iron for a planet carrier and particularly discloses a production method of heat-resistant spheroidal graphite cast iron for a fuel inlet housing. The production method comprises a material preparation process, a smelting process, a spheroidizing process, an inoculating process and a casting process. The heat-resistant spheroidal graphite cast iron for the gas inlet housing comprises the following components in percentage by weight: 3.00 to 3.40% of C, 3.60 to 4.00% of Si, 0.30 to 0.60% of Mn, not greater than 0.050% of P, not greater than 0.020% of S, 0.010 to 0.030% of Re, 0.020 to 0.060% of Mg, 0.40 to 0.70% of Mo, and the balance of iron. The heat-resistant spheroidal graphite cast iron for the gas inlet housing, produced by the method, is high in high-temperature strength and has oxidation resistance, anti-growth resistance and other heat-resistant performances.

Description

technical field [0001] The invention relates to a production method of nodular cast iron, in particular to a production method of nodular cast iron for a planet carrier. Background technique [0002] With the change of my country's energy structure, the gradual maturity of wind power technology, the reduction of costs and the promotion of strong support from national policies, the growth rate of domestic wind power installed capacity will be significant in the future. As a key component of the wind turbine, the planetary carrier must have sufficient strength to withstand the environmental impact. However, as the wall thickness of the casting increases, the graphite form and matrix structure of the ductile iron casting will deteriorate. Therefore, the current There are technologies that require later heat treatment to ensure that the ductile iron planet carrier castings meet the requirements of mechanical properties, but heat treatment brings problems such as complex operatio...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C22C33/10
Inventor 应亮郑燕华宋贤发傅明康
Owner RIYUE HEAVY IND
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