Anti-air-leakage heat-preservation non-return aluminum titanate lift tube for aluminum alloy low-pressure casting

Abstract

The invention discloses an anti-air-leakage heat-preservation non-return aluminum titanate lift tube for aluminum alloy low-pressure casting. A mounting plate is coaxially and fixedly arranged at thetop end of an aluminum titanate tube, the bottom end of the aluminum titanate tube is coaxially and fixedly provided with an aluminum titanate filter disc, the top of the aluminum titanate filter discis coaxially provided with a groove, the groove wall of the groove is provided with side holes, bottom holes are formed in the bottom of the groove, the side holes and the bottom holes make the groove communicate with the outer side of the aluminum titanate filter disc, a matched non-return piece is arranged in the groove, the non-return piece moves up and down in the groove and is provided withthrough holes, and projections, which is perpendicular to the bottom of the groove, of the through holes are staggered from the bottom holes. According to the structure mentioned above, the anti-air-leakage heat-preservation non-return aluminum titanate lift tube for the aluminum alloy low-pressure casting has the beneficial effects that in the process of ascending into the lift tube, the aluminumalloy melt enters the aluminum titanate tube through the bottom holes of the groove and the through holes of the non-return piece, so that skimming and filtering of the aluminum alloy melt can be achieved; and the aluminum alloy melt can enter the aluminum titanate tube stably, and thus quality of aluminum alloy low-pressure casting products is improved.

Description

technical field [0001] The invention relates to the technical field of a liquid riser for aluminum alloy low-pressure casting, in particular to a gas-leakage heat-preserving and non-return aluminum titanate liquid riser for aluminum alloy low-pressure casting. Background technique [0002] At present, the riser pipes for aluminum alloy low-pressure casting are generally made of iron materials. At high temperatures, iron materials are easy to react with molten aluminum and cause iron to increase in molten aluminum. The aluminum alloy low-pressure casting riser can also be made of ceramic material or silicon carbide material, but under the action of high temperature and casting pressure, the ceramic riser is prone to air leakage, and the ceramic material is easy to chemically react with the aluminum liquid at high temperature. Ceramic riser tubes have a short lifespan. The riser pipe made of silicon carbide is prone to cracks and air leakage under repeated heating and cooling...

AI Technical Summary

Problems solved by technology

[0002] At present, the riser pipes for aluminum alloy low-pressure casting generally use iron materials.

The aluminum alloy low-pressure casting riser can also be made of ceramic material or silicon carbide material, but under the action of high temperature and casting pressure, the ceramic riser is prone to air leakage, and the ceramic material is prone to chemical reaction with aluminum liquid at high temperature. Ceramic riser tubes have a very short service life

The riser pipe made of silicon carbide is prone to cracks and air leakage under repeated heating and cooling, causing the cavity to be filled with gas, and the molten metal cannot fill the cavity, resulting in a decline in product quality

During the use of the liquid riser, due to the low temperature of the lower mold of the low-pressure casting mold, the heat dissipation during the rising of the liquid metal causes the temperature of the liquid metal on the upper part of the riser to be low, and the riser is prone to freezing to death

In addition, when a low-pressure casting is completed, when the molten aluminum in the riser pipe descends and flows back to the crucible, it is easy to impact the bottom of the crucible to suspend the inclusions at the bottom of the crucible, and the quality of the casting will be affected when the molten aluminum enters the mold next time

Aiming at the problems existing in the existing riser pipe above, the patented product aluminum alloy low-pressure casting is developed to prevent air leakage and heat preservation check aluminum titanate riser pipe to solve the problems of iron increase, air leakage and freezing of aluminum liquid existing in the existing riser pipe. Death, suspension of inclusions in the crucible, etc.

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