Quasi pressure adjusting casting machine and casting method thereof

Abstract

The present invention relates to a quasi pressure adjusting casting machine comprising a casting kettle, a vacuum baffle, an upper cover, a rapidly locking mechanism, a sealing taper cylinder and a right-angle sealing ring, wherein The upper cover is hinged with an upper cover hinge ear arranged at one side of the casting kettle; the middle of the rapidly locking mechanism is hinged with a locking mechanism hinge ear arranged at the other side of the casting kettle; a groove locked with the upper cover is arranged on the upper end of the rapidly locking mechanism, and a swelling force spring connected with the casting kettle is arranged at the lower end; both ends of the swelling force spring are respectively fixed on the casting kettle and the rapidly locking mechanism; the right-angle sealing ring is arranged in the vacuum baffle, and the vacuum baffle is covered at an opening at the top of the casting kettle; and the sealing taper cylinder is internally sheathed in the right-angle sealing ring. The present invention solves that aluminum alloy thin wall pieces are difficult to form and the aluminum alloy thin wall pieces always appear the problems of microshrinkage, poor tightness and suppress leakage. The present invention has the advantages of that super-thin aluminum alloy casting pieces can be produced; the strength of casting pieces can be improved about 25%; the toughness of the casting pieces can be improved to 80 % to 100%; the production rate is high; and the equipment cost is tens times as low as pressure adjusting casting equipment.

Description

technical field [0001] The invention relates to a casting forming process and equipment, in particular to a quasi-pressure-regulating casting machine and a casting method thereof, which are small and complex, thin-walled and require high density for casting with aluminum alloy. Background technique [0002] The pressure-regulating casting is in two containers that are sealed with each other and only connected by a riser pipe, (see the attachment for the structure of the pressure-regulating casting device Figure II ,) Synchronously evacuate to reduce the pressure in the upper and lower tanks to further reduce the gas content of the aluminum alloy in the lower tank, and then slowly increase the pressure in the lower tank to force the aluminum water into the mold of the upper tank to complete the filling and pouring , which can further reduce the possibility of air holes in the casting and can cast thin-walled castings. When the mold is full, the vacuum is broken while keeping ...

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Problems solved by technology

[0002] The pressure-regulating casting is in two containers that are sealed with each other and only connected by a riser pipe, (see the attachment for the structure of the pressure-regulating casting device Figure II ,) Synchronously evacuate to reduce the pressure in the upper and lower tanks to further reduce the gas content of the aluminum alloy in the lower tank, and then slowly increase the pressure in the lower tank to force the aluminum water into the mold of the upper tank to complete the filling and pouring , which can further reduce the possibility of air holes in the casting and can cast thin-walled castings. When the mold is full, the vacuum is broken while keeping the pressure of the lower tank higher than that of the upper tank, and then the pressure of the upper and lower tanks is quickly increased. To about 0.6Mpa, the casting is solidified under this pressure, so the strength of the casting is 25% higher than that of sand casting, and the toughness can be doubled. , this advantage is incomparable in all kinds of forming, so it is widely used in military production, it also has some disadvantages: 1. Expensive equipment cost; 2. Low production efficiency; 3. Pouring of molten aluminum and sealing of containers It is troublesome to open and clean up, but the advantages and disadvantages of gravity sand casting are just the opposite.

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