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CN-122013031-A - Casting process of ball-milling casting cast by wire feeding spheroidization and application thereof

CN122013031ACN 122013031 ACN122013031 ACN 122013031ACN-122013031-A

Abstract

The invention discloses a casting process of a ball-milling casting cast by wire-feeding spheroidizing and application thereof, which solves the problem of inoculating molten iron by adopting a granularity inoculant in the prior art and has the beneficial effects of improving the reaction rate and improving the stability of the inoculation effect; the molten iron is finely adjusted to contain 3.7 to 3.9 percent of carbon, 1.0 to 1.5 percent of silicon, 0.1 to 0.3 percent of manganese, 0.06 percent or less and 0.05 percent or less of phosphorus and sulfur, the temperature of the molten iron is raised to 1520 to 1530 ℃ and kept at the same time for a set time, the pretreatment of the molten iron is that a pretreatment agent is added at a tapping groove before tapping, the mass of the pretreatment agent is 0.25 to 0.35 percent of tapping mass, silicon is brought in during the pretreatment, the mass of the silicon is 0.15 to 0.2 percent of tapping mass, and a spheroidizing line is added into a spheroidizing chamber of a spheroidizing reaction bag.

Inventors

  • ZHENG GUANGHUI
  • ZHAO PEIZHEN
  • ZHENG JINZE
  • ZHENG JINYU

Assignees

  • 山东金帝精密机械科技股份有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The casting process of the ball-milling casting cast by wire feeding spheroidization is characterized by comprising the following steps of: Adding scrap steel and return iron into a furnace, adding pig iron, and smelting to form molten iron; Finely adjusting the components of molten iron so that the molten iron comprises 3.7 to 3.9 mass percent of carbon, 1.0 to 1.5 mass percent of silicon, manganese, phosphorus and sulfur, 0.1 to 0.3 mass percent of less than or equal to 0.06 mass percent of less than or equal to 0.05 mass percent of carbon, silicon, manganese, phosphorus and sulfur; Raising the temperature of molten iron to 1520-1530 ℃, preserving heat and standing for a set time; Spheroidizing and inoculating: adding the spheroidization line into molten iron, wherein the spheroidization line brings silicon and magnesium into the process of adding; adding an inoculation line into molten iron, wherein silicon is brought in during the addition process of the inoculation line; The molten iron pretreatment, namely adding a pretreatment agent at the tapping channel before tapping the molten iron, wherein the mass of the pretreatment agent is 0.25-0.35% of the tapping mass, and silicon is brought in the pretreatment process; inoculating, namely adding a primary inoculant into a spheroidizing chamber of a spheroidizing reaction ladle, wherein the mass of the primary inoculant is 0.5-0.7% of the mass of the cast iron, and carrying silicon; the pouring temperature is controlled between 1400 ℃ and 1370 ℃, a secondary inoculant is added along with the flow during pouring, and the secondary inoculant is 0.09-0.15% of the tapping mass and is brought into silicon; and stopping pouring after the pouring is carried out for a set time.
  2. 2. The casting process of a ball-milling cast piece for wire-feed spheroidization casting according to claim 1, wherein the addition amount of the spheroidization wire is 22 m/ton-28 m/ton, and the wire-feed speed is 28 m/min-33 m/min.
  3. 3. The casting process of a ball-milling casting for wire-feeding spheroidizing casting according to claim 1, wherein the components of the spheroidizing wire comprise 40% -50%, 2% -3.5%, 23% -30%, 0.5% -1.2%, 1.8% -3% and 0.8% -2% of silicon, calcium, magnesium, aluminum, rare earth and magnesium oxide, respectively.
  4. 4. The casting process of the ball-milling casting for wire-feeding spheroidizing casting according to claim 1, wherein the inoculation line is SiBaCa inoculation lines, the addition amount of the inoculation lines is 22 meters/ton-28 meters/ton, and the wire-feeding speed is 28 meters/minute-33 meters/minute; The inoculating line comprises 65-75% of silicon, 1-3% of calcium, 0.8-1.4% of aluminum and 2.5-3.8% of barium by mass.
  5. 5. A process for casting a wire-fed spheroidized cast ball-milled casting according to claim 1 or 3, wherein the primary inoculant is SiBaCa inoculant and the secondary inoculant is Y-SiBi inoculant.
  6. 6. The casting process of the ball-milling casting subjected to wire-feeding spheroidizing casting according to claim 1, wherein the granularity of the pretreatment agent is 0.2-1 mm, the granularity of the primary inoculant is 3-8 mm, and the granularity of the secondary inoculant is 0.2-0.7 mm; The granularity of the spheroidizing line is 220g/m-250g/m, and the granularity of the inoculating line is 255g/m-285g/m.
  7. 7. The casting process of the ball-milling casting by wire-feeding spheroidizing casting according to claim 1, wherein after the inoculation and spheroidizing treatment, the molten iron in the spheroidizing chamber comprises 3.4-3.8% of carbon, 2.6-2.9%, 0.15-0.2%, less than or equal to 0.06%, less than or equal to 0.02%, 0.04-0.06% and 0.02-0.04% of carbon, silicon, manganese, phosphorus, sulfur, magnesium and rare earth by mass percent.
  8. 8. The casting process of the ball-milling casting subjected to wire-feeding spheroidization casting according to claim 1, wherein the spheroidization wire is a silicon-magnesium rare earth alloy Mg8RE3.
  9. 9. The casting process of a ball-milling cast product by wire-feed spheroidizing casting according to claim 1, wherein the ratio of the height to the diameter of the spheroidizing reaction package is 1.5-2.0.
  10. 10. Use of a casting process of a ball-milled casting for wire-fed spheroidization casting according to any one of claims 1 to 9, characterized in that it is applied to the casting of wind-powered bearing frames; When the wind power bearing frame is cast, 75Si iron and silicon barium alloy are adopted to replace the inoculation line for compound inoculation, and the mass percentages of silicon, barium, aluminum and calcium in the 75Si iron and silicon barium alloy are respectively 60% -68%, 4% -6%, 1.0% -2.0% and 0.8% -2.2%.

Description

Casting process of ball-milling casting cast by wire feeding spheroidization and application thereof Technical Field The invention relates to the technical field of wind power bearing retainers, in particular to a casting process of a ball-milling casting cast by wire feeding spheroidization and application thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The wind power bearing is a key component of a wind power generator set, is mainly applied to systems such as a main shaft, a gear box, a yaw pitch, and the like, bears the functions of supporting the weight of a blade and a hub, transmitting power and the like, is provided with a wind power bearing retainer used for isolating and guiding rolling bodies, the wind power bearing retainer is required to bear centrifugal force and friction heat, the wind power environment has the characteristics of high humidity, large temperature difference, frequent impact load and the like, the wind power bearing retainer is required to have corrosion resistance, fatigue resistance and thermal stability, the wind power bearing retainer is mostly molded by adopting a casting process, and the wind power bearing retainer is mostly molded by adopting a die casting method at present. In the casting process of the wind power bearing retainer, most of the wind power bearing retainer is inoculated by inoculant, but the inoculant usually selects inoculant with granularity, when the inoculant with granularity is scattered in a spheroidizing ladle, the problem of uneven distribution easily occurs, partial area inoculant gathers to cause local overinoculation, and the other partial area inoculant has insufficient content to cause poor inoculation, so that the graphite morphology and distribution of a casting are influenced, and the fluctuation of mechanical properties of the casting is possibly larger. Meanwhile, the contact area of the granularity inoculant and the molten iron is relatively limited, the reaction is insufficient, the waste of the inoculant is easy to cause, and the production cost is increased. In the casting process of the wind power bearing retainer with larger size and thicker thickness, the composition of molten iron and the temperature of the molten iron are required to be controlled so as to ensure the smooth molding of the wind power bearing retainer, and the wind power bearing retainer is definitely different from the control of the composition and the temperature of the molten iron with thin wall and smaller size. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a casting process of a ball-milling casting for wire-feeding spheroidization casting, which improves the stability of inoculation effect and ensures the performances of the casting in all aspects. In order to achieve the above object, the present invention is realized by the following technical scheme: A casting process of ball-milling castings cast by wire-feeding spheroidization comprises the following steps: Adding scrap steel and return iron into a furnace, adding pig iron, and smelting to form molten iron; Finely adjusting the components of molten iron so that the molten iron comprises 3.7 to 3.9 mass percent of carbon, 1.0 to 1.5 mass percent of silicon, manganese, phosphorus and sulfur, 0.1 to 0.3 mass percent of less than or equal to 0.06 mass percent of less than or equal to 0.05 mass percent of carbon, silicon, manganese, phosphorus and sulfur; Raising the temperature of molten iron to 1520-1530 ℃, preserving heat and standing for a set time; Spheroidizing and inoculating: adding the spheroidization line into molten iron, wherein the spheroidization line brings silicon and magnesium into the process of adding; adding an inoculation line into molten iron, wherein silicon is brought in during the addition process of the inoculation line; The molten iron pretreatment, namely adding a pretreatment agent at the tapping channel before tapping the molten iron, wherein the mass of the pretreatment agent is 0.25-0.35% of the tapping mass, and silicon is brought in the pretreatment process; inoculating, namely adding a primary inoculant into a spheroidizing chamber of a spheroidizing reaction ladle, wherein the mass of the primary inoculant is 0.5-0.7% of the mass of the cast iron, and carrying silicon; the pouring temperature is controlled between 1400 ℃ and 1370 ℃, a secondary inoculant is added along with the flow during pouring, and the secondary inoculant is 0.09-0.15% of the tapping mass and is brought into silicon; and stopping pouring after the pouring is carried out for a set time. The casting process of the ball-milling casting for wire-feeding spheroidizing casting comprises the steps of adding the spheroidizing wire at the feeding speed of 28-33 m/min at the feeding speed of 22-28 m/ton. The casting process of the ball-