Low-pressure filling method and device using electromagnetic stirring technology

Abstract

The invention discloses a low-pressure filling method and device using electromagnetic stirring technology. The device includes a crucible furnace and a riser tube. The crucible furnace is provided with a furnace cover, so that the inside of the crucible furnace forms a sealed cavity. The top of the sealed cavity is communicated to the bottom of the cavity to be filled through a riser tube. An electromagnetic stirrer is provided beside the riser tube, and the crucible furnace has a pressurized gas inlet. Pressure is applied to metal melt in the crucible furnace to make the metal melt rise through the riser. Under the filling pressure, the metal melt enters the cavity smoothly until the entire cavity is completely filled. The temperature of the metal melt passing through the riser is 30 to60% of the liquidus temperature of the metal or alloy plus the width of its solidification temperature interval; As the metal melt flows through the riser, the metal melt is electromagnetically stirred. The device disclosed in the invention uses electromagnetic stirring to break up the generated dendrites, new crystal nuclei are added, the grain structure is refined, the pouring temperature is lowered, the mechanical properties of the casting can be improved, air intake and shrinkage of the casting can be reduced, and the casting quality and metal utilization rate can be improved.

Description

technical field

[0001] The invention relates to a low-pressure casting method, in particular to a mold filling method in low-pressure casting, especially a low-pressure mold filling method using electromagnetic stirring technology. Background technique

[0002] Low-pressure casting is a method of making liquid metal fill the cavity from bottom to top along the riser pipe under the action of pressure to overcome gravity and other resistances, and obtain castings under pressure. The pressure used is low, and the pressure in the filling stage is generally 20-70 kPa, so it is called low-pressure casting. Low-pressure casting has the advantages of easy adjustment of pouring pressure and speed, stable mold filling, easy realization of sequential solidification, and high utilization of molten metal.

[0003] The process of low-pressure casting includes the liquid lifting stage, the filling stage and the solidification and crystallization stage. In the filling stage, the fluidity ...

Examples

Embodiment 1

[0023] Embodiment one: see figure 1 As shown, an aluminum alloy low-pressure casting device includes a cavity 1, a liquid riser 2, an electromagnetic stirrer 3, a furnace cover 4, and a crucible furnace 5 from top to bottom; the furnace cover 4 is used to seal the crucible furnace 5, The upper part of the liquid riser 2 cooperates with the mold cavity 1 , and the electromagnetic stirrer 3 is placed around the liquid riser 2 and electromagnetically stirs the molten metal flowing through the liquid riser 2 .

[0024] Wherein, the electromagnetic stirrer 3 can adopt various forms in the prior art, and its function is to generate an alternating magnetic field after the power is turned on to stir the molten metal in the liquid riser.

[0025] When pouring, first keep the temperature of the metal melt near the liquidus line. After the pouring starts, the molten metal flows upward from the crucible furnace 5 along the riser 2. The molten metal in the casting is stirred rapidly to ac...

technical field

[0001] The invention relates to a low-pressure casting method, in particular to a mold filling method in low-pressure casting, especially a low-pressure mold filling method using electromagnetic stirring technology. Background technique

[0002] Low-pressure casting is a method of making liquid metal fill the cavity from bottom to top along the riser pipe under the action of pressure to overcome gravity and other resistances, and obtain castings under pressure. The pressure used is low, and the pressure in the filling stage is generally 20-70 kPa, so it is called low-pressure casting. Low-pressure casting has the advantages of easy adjustment of pouring pressure and speed, stable mold filling, easy realization of sequential solidification, and high utilization of molten metal.

[0003] The process of low-pressure casting includes the liquid lifting stage, the filling stage and the solidification and crystallization stage. In the filling stage, the fluidity ...

Examples

Embodiment 1

[0023] Embodiment one: see figure 1 As shown, an aluminum alloy low-pressure casting device includes a cavity 1, a liquid riser 2, an electromagnetic stirrer 3, a furnace cover 4, and a crucible furnace 5 from top to bottom; the furnace cover 4 is used to seal the crucible furnace 5, The upper part of the liquid riser 2 cooperates with the mold cavity 1 , and the electromagnetic stirrer 3 is placed around the liquid riser 2 and electromagnetically stirs the molten metal flowing through the liquid riser 2 .

[0024] Wherein, the electromagnetic stirrer 3 can adopt various forms in the prior art, and its function is to generate an alternating magnetic field after the power is turned on to stir the molten metal in the liquid riser.

[0025] When pouring, first keep the temperature of the metal melt near the liquidus line. After the pouring starts, the molten metal flows upward from the crucible furnace 5 along the riser 2. The molten metal in the casting is stirred rapidly to ac...

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