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CN-121988701-A - Magnesium alloy casting gate device

CN121988701ACN 121988701 ACN121988701 ACN 121988701ACN-121988701-A

Abstract

The application relates to the technical field of magnesium alloy casting, and discloses a magnesium alloy casting pouring gate device which comprises a base and a die, wherein a fixed structure is arranged on the base, a pouring assembly is arranged above the base, the pouring assembly comprises a pouring box, a lifting structure is arranged on the base, a vibration structure is arranged below the die, a protective gas supply assembly is connected to the die, a pressure adjusting assembly is connected to the protective gas supply assembly, a filtering structure is arranged in the pouring box, air in the die is discharged, air holes are avoided in the magnesium alloy pouring process, components are promoted to be uniformly distributed, segregation phenomenon is avoided, a wrapped protective film can be formed to prevent magnesium alloy melt from being oxidized, stable pressure can be applied to enable magnesium alloy to be formed more tightly, the problems of mechanical property reduction, air holes, cracks, deformation and the like are avoided, filling shortage of a far-end region due to large flow resistance is avoided, shrinkage or cracks caused by local overheating are prevented, filling speed is increased, and period is shortened.

Inventors

  • Ding Jiehang
  • HUANG ZIHONG
  • LI QICHANG
  • FAN WENJIE
  • WANG ZHENG

Assignees

  • 重庆新型储能材料与装备研究院

Dates

Publication Date
20260508
Application Date
20260202

Claims (10)

  1. 1. The magnesium alloy casting pouring gate device is characterized by comprising a base (1), wherein a die (2) is arranged on the base (1), a fixing structure (3) for fixing the die (2) is arranged on the base (1), a sealing cover (4) is arranged on the die (2), a casting component (5) for casting is arranged above the base (1), the casting component (5) comprises a casting box (501) connected with an aluminum alloy feeding channel, a plurality of casting bars (502) are arranged below the casting box (501) at intervals, a lifting structure (6) for driving the casting box (501) to lift is arranged on the base (1), a plurality of casting openings matched with the casting bars (502) are arranged on the sealing cover (4), a vibration structure (7) for discharging gas in magnesium alloy is arranged below the die (2), a protective gas supply component (8) is connected onto the die (2), and a pressure adjusting component (9) is connected onto the protective gas supply component (8), and a filtering structure (10) is arranged in the casting box (501).
  2. 2. The magnesium alloy casting gate device according to claim 1, wherein the lifting structure (6) comprises an air cylinder (601) arranged on the base (1), a piston rod (602) of the air cylinder (601) is connected to the side wall of the casting box (501), a connecting plate (603) is arranged in the middle of the piston rod (602), the connecting plate (603) is connected with the lower surface of the casting box (501) through bolts, a guide rail (604) for lifting the casting box (501) is arranged on the side wall of the base (1), the casting rods (502) are uniformly arranged below the casting box (501) at intervals, and the guide rail (604) and the connecting plate (603) are respectively arranged on the front side and the rear side of the base (1).
  3. 3. The magnesium alloy casting pouring gate device according to claim 2, wherein a funnel-shaped auxiliary feeding groove (503) is arranged at the joint of the pouring box (501) and the pouring rod (502), the inner diameter of the discharging end of the pouring rod (502) is larger than that of the feeding end, and guide grooves (504) are uniformly arranged on the inner wall of the pouring rod (502).
  4. 4. The magnesium alloy casting gate device according to claim 2, wherein the fixing structure (3) comprises fixing plates arranged on two sides of the base (1) and a threaded rod (301) arranged above the fixing plates, one end of the threaded rod (301) is provided with a handle (302), the other end of the threaded rod is provided with a positioning plate (303) connected with the mold (2), the positioning plate (303) is in threaded connection with the threaded rod (301), the positioning plate (303) is provided with a buffer pad (304), the handle (302) is provided with anti-skid threads, and the base (1) is provided with a threaded hole for installing the threaded rod (301).
  5. 5. The magnesium alloy casting pouring gate device according to claim 1, wherein the shielding gas supply assembly (8) comprises an air inlet pipeline (401) and an air outlet pipeline (402) which are arranged on the sealing cover (4), the air inlet pipeline (401) is connected with a gas mixing tank (801), a dryer (803) and a booster pump (802), shielding gas is premixed in the gas mixing tank (801), the shielding gas is mixed gas of SF 6 and CO 2 , the volume fraction of SF 6 is 0.25% -2.0%, trapezoid buffer cavities (403) are respectively arranged at the connecting positions of the air inlet pipeline (401) and the air outlet pipeline (402) and the sealing cover (4), and the air outlet pipeline (402) is connected with an air storage tank (804).
  6. 6. The magnesium alloy casting gate device according to claim 5, wherein the pressure regulating assembly (9) comprises a pressure sensor (901) arranged in the sealing cover (4), a regulating valve (902) arranged on the air inlet pipeline (401) and the air outlet pipeline (402) and a pressure controller, the pressure sensor (901) stretches into the casting box (501) to collect pressure data and transmit the pressure data to the pressure controller, and the pressure controller is electrically connected with the regulating valve (902).
  7. 7. The magnesium alloy casting gate device according to claim 1, wherein the vibration structure (7) comprises a driving member (701) arranged on the base (1), a rotating shaft (702) connected to an output end of the driving member (701) and a plurality of cams (703) arranged on the rotating shaft (702) at intervals, phase angles among the cams (703) are different, push rods (704) are correspondingly arranged above the cams (703), elastic buffer pads (705) are arranged at the top ends of the push rods (704), fixing rods (706) are arranged above the driving member (701), and connecting frames for connecting the push rods (704) are arranged on the fixing rods (706).
  8. 8. The magnesium alloy casting gate device according to claim 1, wherein a gate guide sleeve (505) in threaded connection with a gate (502) is arranged below the casting box (501), a switch valve is matched on the gate guide sleeve (505), and scales for indicating the bottom of the die are arranged on the gate (502).
  9. 9. The magnesium alloy casting pouring gate device according to claim 8, wherein the pouring box (501) is made of a high-temperature-resistant Wen Zhutie material, the inner wall of the pouring box is coated with a silicon nitride coating, the outer side of the pouring box is wound with a flexible heat-insulating layer, and the flexible heat-insulating layer is made of a high-temperature-resistant ceramic fiber material.
  10. 10. The magnesium alloy casting sprue apparatus according to claim 9, characterized in that the filtering structure (10) comprises at least two layers of filtering sheets made of magnesium oxide foam ceramic material obliquely arranged in the casting box (501), the pore diameter of the upper filtering sheet (1001) is 10-15 μm, the pore diameter of the lower filtering sheet (1002) is 5-8 μm, the included angle between the filtering sheet and the lower surface of the casting box (501) is 42-47 °, the side wall of the casting box (501) is provided with a detachable access door, and the filtering sheet (1001) is installed through the access door.

Description

Magnesium alloy casting gate device Technical Field The application relates to the technical field related to magnesium alloy casting, in particular to a magnesium alloy casting gate device. Background The magnesium alloy is an alloy which is formed by adding other elements based on magnesium. The magnesium alloy has the characteristics of small density (about 1.8g/cm < 3 >) and high specific strength, high specific elastic modulus, good heat dissipation, good shock absorption, larger impact load bearing capacity than aluminum alloy, and good corrosion resistance to organic matters and alkali. The main alloy elements are aluminum, zinc, manganese, cerium, thorium, a small amount of zirconium or cadmium, etc. The most widely used at present is magnesium-aluminum alloy, and then magnesium-manganese alloy and magnesium-zinc-zirconium alloy. The method is mainly used for the industrial departments of aviation, aerospace, transportation, chemical industry, rocket and the like. The lightest metal among the practical metals, magnesium has a specific gravity of about 2/3 of aluminum and 1/4 of iron. It is the lightest metal in the practical metals, and has high strength and high rigidity. However, the chemical properties of the magnesium alloy are very active, the liquid magnesium alloy is very easy to react with oxygen and water vapor in the air in the pouring process to generate oxide inclusions (such as MgO), and meanwhile, the defects of air holes, shrinkage cavities, shrinkage porosity and the like are easy to occur, so that the compactness and mechanical properties of castings are seriously affected. In addition, in the traditional magnesium alloy pouring process, mechanical vibration, high-pressure die casting and other modes are often adopted for improving the density of castings, but the mechanical vibration easily causes the magnesium alloy liquid to splash and aggravate oxidation, the high-pressure die casting equipment is high in cost and has strict requirements on the die, and the traditional pouring gate device only has the functions of diversion and preliminary filtration, so that the anti-oxidation protection and the pressurizing densification cannot be realized at the same time, and the quality and the production economy of castings are difficult to be considered. In the prior art, the anti-oxidation measures for magnesium alloy casting mainly comprise two kinds of flux protection and gas protection. The flux protection method can form a film on the surface of the magnesium alloy liquid to isolate air, but the flux is easy to sink to generate flux inclusion, reduces the corrosion resistance of castings, releases harmful gas to pollute the environment and corrode equipment, and the gas protection method mostly adopts mixed gas of SF 6, nitrogen and carbon dioxide to realize oxidation prevention by forming a compact MgF 2 oxide film on the surface of the magnesium alloy liquid. Disclosure of Invention The application mainly aims to provide a magnesium alloy casting pouring gate device, which is characterized in that a stable pressure is applied in the casting process through a protective gas, the gas is discharged in the casting process of the magnesium alloy, the generation of air holes is avoided, the oxidation protection of magnesium alloy liquid is realized, meanwhile, the magnesium alloy liquid is pushed to fully fill a die cavity, solidification shrinkage is compensated, and the compactness and mechanical property of a casting are obviously improved. The magnesium alloy casting pouring gate device comprises a base, a die is arranged on the base, a fixing structure for fixing the die is arranged on the base, a sealing cover is arranged on the die, a casting component for casting is arranged above the base, the casting component comprises a casting box connected with an aluminum alloy feeding channel, a plurality of casting rods are arranged below the casting box at intervals, a lifting structure for driving the casting box to lift is arranged on the base, a plurality of casting openings matched with the casting rods are arranged on the sealing cover, a vibration structure for discharging gas in magnesium alloy is arranged below the die, a protective gas supply component is connected to the die, a pressure adjusting component is connected to the protective gas supply component, and a filtering structure is arranged in the casting box. Further, the elevation structure is including setting up the cylinder on the base, the piston rod of cylinder is connected on the lateral wall of pouring the case, the middle part of piston rod is provided with the connecting plate, the connecting plate passes through bolted connection with pouring the case lower surface, be provided with the guide rail that is used for pouring the case to go up and down on the lateral wall of base, the even interval setting of watering the pole is in pouring the case below, guide rail and connecting plate set up the front and back