Method for producing nodular cast iron planetary supporter

Abstract

The invention discloses a nodular cast iron planet carrier production method. The nodular cast iron planet carrier production method comprises a smelting iron fluid working procedure, a nodulizing working procedure, an inoculation working procedure and a casting working procedure; after the casting working procedure is finished, when the planet carrier in put into the casting mould, the temperature of T1 is maintained within 790 to 810 DEG C, the planet carrier casting product is taken from the casting mould and the temperature is rapidly reduced; when the temperature T1 of the planet carrier casting product is reduced to the temperature of T2, that is within 490 to 510 DEG C, the planet carrier casting product is hanged into a heat retaining vessel, and then after casting sand is covered on the planet carrier casting product, the thermal retardation is continued; when the temperature T2 of the planet carrier casting product is maintained to the temperature T3, that is within 190 to 210 DEG C, the planet carrier casting product is taken out from the heat retaining vessel and the cleaning work is performed; and finally, the stress removing and annealing working procedure is performed to the planet carrier casting product. The nodular cast iron planet carrier production method has the advantages that the operation is simple, the energy consumption is less, the cost is low, the production cycle is short, the costing product distortion is not easy, and the planet carrier casting product contains pearlyte of more than 80 percent to reach the mechanical property requirements.

Description

Technical field: [0001] The invention belongs to a production process of nodular cast iron, in particular to a production method of a nodular cast iron planet carrier. Background technique: [0002] At present, in the production process of the nodular cast iron planet carrier, in order to improve the production process, the industry generally adopts the method of as-cast production. However, it is difficult to achieve the mechanical properties of the nodular cast iron planet carrier by the existing method of as-cast production. aspect requirements. For this reason, the industry adopts the "normalizing-tempering" heat treatment method to ensure that the planetary carrier castings meet the requirements in terms of mechanical properties. However, while ensuring the mechanical properties, heat treatment also brings about the problems of large energy consumption, high cost, long production cycle and easy deformation of castings. Moreover, during the heat treatment process, the p...

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Problems solved by technology

However, while ensuring the mechanical properties, heat treatment also brings about the problems of large energy consumption, high cost, long production cycle and easy deformation of castings. Moreover, during the heat treatment process, the planet carrier castings need to be cooled quickly by air cooling. To use a large fan to cool down quickly can ensure that the planet carrier casting contains more than 80% pearlite, which undoubtedly brings some troubles to the actual production operation of the nodular cast iron planet carrier

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