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CN-122012935-A - Cast aluminum alloy refining degassing device and method thereof

CN122012935ACN 122012935 ACN122012935 ACN 122012935ACN-122012935-A

Abstract

The invention relates to the technical field of aluminum alloy casting, in particular to a cast aluminum alloy refining degassing device and a method thereof, wherein the device comprises a base, a lifting frame is arranged at one side of the upper end of the base, a lifting output end of the lifting frame is connected with a supporting frame, a degassing mechanism comprises a layered degassing component and a rotating speed control component which are arranged below the supporting frame, the layered degassing component comprises a gear ring arranged below the supporting frame, a servo motor is arranged at one side of the gear ring, according to the invention, the lengths of the first graphite rotor, the second graphite rotor and the third graphite rotor in the layered degassing component are sequentially shortened, stirring degassing can be performed at different depths extending into the aluminum alloy melt, and due to the fact that the hydrogen content of the melt at different depths is different, degassing can be performed on the aluminum alloy melt at different depths in a targeted manner, the problem that only a single-length rotor can act on local depths to cause incomplete degassing is avoided, and the uniformity and the thoroughness of integral degassing are greatly improved.

Inventors

  • QIAN ZHENJIE
  • QIAN DONGFANG
  • Guo Jingou
  • WANG HONGTAO
  • HU NINGNING
  • KANG FEI

Assignees

  • 东亚科技(苏州)有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (9)

  1. 1. A refining and degassing device for casting aluminum alloy is characterized by comprising, The lifting device comprises a base (101), wherein a lifting frame (102) is arranged on one side of the upper end of the base (101), and a lifting output end of the lifting frame (102) is connected with a supporting frame (103); the degassing mechanism (100) comprises a layered degassing component and a rotating speed control component which are arranged below the supporting frame (103); The layering degassing component comprises a gear ring (104) arranged below the supporting frame (103), one side of the gear ring (104) is provided with a servo motor (107), a driving end of the servo motor (107) is provided with a first gear (108), one side lower end of the supporting frame (103) close to the gear ring (104) is fixedly provided with a supporting plate (113), the lower end of the supporting plate (113) is respectively provided with a first graphite rotor (110), a second graphite rotor (111) and a third graphite rotor (112), and the lengths of the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) are gradually shortened in sequence for layering degassing of aluminum alloy melt with different hydrogen contents at different depths; The rotating speed control assembly comprises an annular tooth slot (109) arranged at the lower end of the inner side of the gear ring (104), and the upper ends of the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) are respectively provided with a second gear (114), a third gear (115) and a fourth gear (116) which are used for driving the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) to synchronously rotate by matching with the gear ring (104); The gas removal auxiliary mechanism (200) comprises an intermittent gas supply assembly arranged on the inner side of the gear ring (104), the intermittent gas supply assembly comprises a rotary joint (201) arranged on a first graphite rotor (110), a second graphite rotor (111) and a third graphite rotor (112), a gas supply hose (202) is communicated with the gas inlet end of the rotary joint (201), an arc extrusion strip (203) is arranged on the inner side of the gear ring (104), and the arc extrusion strip (203) is used for intermittently extruding three gas supply hoses (202) in a rotation linkage mode of the gear ring (104).
  2. 2. The apparatus of claim 1, wherein the step degassing component further comprises a sliding rod (105) disposed above the gear ring (104), the sliding rod (105) is fixedly connected with the gear ring (104) by welding, the number of the sliding rods (105) is two, the sliding rods (105) are symmetrically disposed, an annular sliding groove (106) is formed in one side, close to the sliding rods (105), of the supporting frame (103), the size of the sliding rods (105) is matched with that of the annular sliding groove (106), and the sliding rods (105) are slidably connected with the annular sliding groove (106).
  3. 3. The apparatus for refining and degassing a cast aluminum alloy according to claim 2, wherein said first gear (108) is provided on one side of the gear ring (104), and said first gear (108) is engaged with the outer side of the gear ring (104).
  4. 4. The apparatus of claim 3, wherein the upper ends of the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) are respectively rotatably connected with the lower end of the supporting plate (113) through bearings, and the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) are arranged in a triangle shape on the horizontal section of the supporting plate (113).
  5. 5. The apparatus for refining and degassing a cast aluminum alloy according to claim 4, wherein the second gear (114), the third gear (115) and the fourth gear (116) are sequentially and gradually increased in diameter, and the second gear (114), the third gear (115) and the fourth gear (116) are respectively meshed with the annular tooth groove (109).
  6. 6. The apparatus of claim 5, wherein a control box (117) is disposed at a side of the upper end of the base (101) far away from the supporting frame (103), and the control box (117) is electrically connected with the lifting frame (102) and the servo motor (107) respectively.
  7. 7. The apparatus of claim 6, wherein the intermittent air supply assembly further comprises an extrusion part (205) arranged at the lower end of the air supply hose (202), the extrusion part (205) is arranged between the arc extrusion strip (203) and the supporting frame (103), a rubber sheet (206) is adhered to the inner cavity of the extrusion part (205), and the rubber sheet (206) is symmetrically arranged.
  8. 8. The apparatus of claim 7, wherein a rubber strip (207) is adhered to the inner side of the rubber sheet (206), the rubber strips (207) are symmetrically arranged, and supporting springs (208) are fixedly installed at the upper and lower ends of the inner sides of the two rubber sheets (206).
  9. 9. A refining and degassing method for aluminum alloy is characterized by comprising the casting aluminum alloy refining and degassing device as set forth in any one of claims 1-8, S1, height adjustment, namely sending an electric signal to a lifting frame (102) through a control box (117) on a base (101) according to the liquid level of an aluminum alloy melt, driving the lifting frame (102) to drive a supporting frame (103) and a layered degassing component to move up and down, and adjusting a first graphite rotor (110), a second graphite rotor (111) and a third graphite rotor (112) to preset positions respectively extending into different depths of the aluminum alloy melt; S2, driving and starting, namely sending an electric signal to a servo motor (107) through a control box (117), driving the servo motor (107) to drive a first gear (108) to rotate, meshing the first gear (108) with the outer side of a gear ring (104) to drive the gear ring (104) to rotate around a preset circumferential track, and simultaneously sliding a sliding rod (105) above the gear ring (104) in an annular sliding groove (106) of a supporting frame (103) for limiting; S3, layering and differential degassing, wherein an annular tooth groove (109) at the inner side of the gear ring (104) synchronously rotates and is meshed with second, third and fourth gears at the upper ends of the first, second and third graphite rotors, and the diameters of the second, third and fourth gears are sequentially increased to drive the three graphite rotors to synchronously rotate at differential rotating speeds so as to stir the melt at different depths; S4, intermittent air supply assistance, namely, when the gear ring (104) rotates, the inner arc extrusion strip (203) is driven to synchronously move, the arc extrusion strip (203) intermittently extrudes the air supply hose (202), inert gas is intermittently conveyed to each graphite rotor through the rotary joint (201), and the gas rises and is discharged after bubbles are formed in the melt to adsorb hydrogen, so that refining and degassing are completed.

Description

Cast aluminum alloy refining degassing device and method thereof Technical Field The invention relates to the technical field of aluminum alloy casting, in particular to a refining degassing device and a refining degassing method for cast aluminum alloy. Background In the production process of casting aluminum alloy, the hydrogen content in the aluminum alloy melt is a key factor influencing the quality of castings, if the hydrogen content is too high, the castings are easy to generate defects such as air holes, looseness and the like, and the mechanical property and the processing property of the materials are seriously reduced, so that refining and degassing are core procedures of the production of casting aluminum alloy. At present, a main stream degassing mode in the industry mostly adopts a structure of a single graphite rotor matched with continuous inert gas supply, and the device has obvious technical short plates in practical application, so that the production requirement of high-quality aluminum alloy castings is difficult to meet; First, the graphite rotors of conventional devices are fixed in length and can only act on specific depth areas of the aluminum alloy melt. Because the aluminum alloy melts have different hydrogen contents at different depths (the deep melt is generally higher in hydrogen solubility and longer in discharge path, and the hydrogen content is higher than that of the shallow layer), a single rotor cannot carry out targeted degassing on the melts at different depths, so that deep hydrogen is difficult to thoroughly remove, the shallow layer is excessively or insufficiently degassed, the overall degassing is finally uneven, and the risk of air holes still exists at different parts of the casting; Secondly, graphite rotors of the existing device are mostly designed at a single rotating speed, and the rotating speed cannot be adjusted according to the depth of a melt. If a higher rotating speed is adopted to enhance the rising power of deep bubbles, the shallow melt can be caused to violently turn over, the contact area with air is increased, the oxidation reaction is initiated, and a large amount of oxide inclusions are generated; if the rotating speed is reduced to reduce surface tumbling, deep bubbles can slowly rise, and the degassing efficiency is greatly reduced; Finally, the traditional degassing device generally adopts a continuous inert gas supply mode, continuous airflow impacts the surface of a melt, and is easy to cause severe disturbance of the melt, so that not only is oxidation inclusion generated intensified, but also the content of hydrogen is increased due to the fact that air is wrapped by the airflow and enters the melt, and meanwhile, the problems of low gas utilization rate, energy consumption waste and the like are solved, the current industry trend of green production is not met, and improvement is needed, so that a cast aluminum alloy refining degassing device and a method thereof are provided. Disclosure of Invention The present invention has been made in view of the above or the problem in the prior art that different levels of degassing treatment cannot be performed on an aluminum alloy melt. Accordingly, the invention aims to provide a refining degassing device for casting aluminum alloy. In order to solve the technical problems, the invention provides the technical scheme that the cast aluminum alloy refining degassing device comprises a base, wherein a lifting frame is arranged at one side of the upper end of the base, and a lifting output end of the lifting frame is connected with a supporting frame; the degassing mechanism comprises a layered degassing component and a rotating speed control component which are arranged below the supporting frame; The layering degassing component comprises a gear ring arranged below the support frame, one side of the gear ring is provided with a servo motor, a first gear is installed at the driving end of the servo motor, a support plate is fixedly arranged at the lower end of one side of the support frame, which is close to the gear ring, the lower end of the support plate is respectively provided with a first graphite rotor, a second graphite rotor and a third graphite rotor, the lengths of the first graphite rotor, the second graphite rotor and the third graphite rotor are gradually shortened in sequence, and the layering degassing component is used for layering degassing of aluminum alloy melts with different hydrogen contents at different depths; The rotating speed control assembly comprises an annular tooth slot arranged at the lower end of the inner side of the gear ring, and the upper ends of the first graphite rotor, the second graphite rotor and the third graphite rotor are respectively provided with a second gear, a third gear and a fourth gear which are used for driving the first graphite rotor, the second graphite rotor and the third graphite rotor to synchronously rotate by matching with the gear r