Casting method for improving mechanical performance of ZL205A casting
A technology of ZL205A and mechanical properties, applied in the field of aluminum alloy castings, can solve problems such as uneven structure of castings, poor metal density, affecting product delivery, etc.
Inactive Publication Date: 2019-03-08
SHAANXI HONGYUAN AVIATION FORGING
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Problems solved by technology
[0002] ZL205A aluminum alloy castings are smelted and poured in an atmospheric environment. Because the alloy is in a state of normal pressure when solidified, the metal density is poor. At the same time, the original CuAl2 in the original material is not fully dissolved, and the casting structure is not uniform, resulting in medium strength of the mechanical properties of the alloy after heat treatment. Indexes and plasticity indexes are not easy to meet the standard requirements, directly affecting product delivery
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[0012] A casting method for improving the mechanical properties of ZL205A aluminum alloy castings. The ZL205A aluminum alloy castings are poured by atmospheric smelting, sufficient superheating of molten metal, and differential pressure casting. Include the following steps:
[0013] 1. Modeling: using resin sand molding;
[0014] 2. Melting: Use a differential pressure furnace melting crucible to melt in an atmospheric environment, and pour by differential pressure method:
[0015] Melting ZL205A aluminum alloy castings in atmospheric environment, superheat temperature of molten metal: 740~750℃, pouring temperature: 710∽720℃;
[0016] The synchronous pressure is 0.08MPa, the rising liquid pressure is 0.0812MPa; the liquid rising speed=50~60mm / s; the filling pressure=0.027Mpa; the filling speed=50~60mm / s; the crystallization pressure difference=0.3MPa, the crystallization time=480 ~520s.
[0017] 3. Clean up
[0018] Sand blowing, cutting, grinding: According to the cutting...
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Abstract
The invention relates to a casting method for improving mechanical performance of a ZL205A casting. The casting method is characterized in that atmosphere smelting, metal liquid sufficient overheatingand differential pressure ZL205A alloy casting pouring are adopted. The method comprises the following steps that the ZL205A alloy casting is smelted at the atmosphere environment, the metal liquid overheat temperature is 740-750 DEG C, and the pouring temperature is 710-720 DEG C; the synchronous pressure is 0.8 MPa, the liquid ascending pressure=the height from the liquid surface to the upper end face of a liquid ascending pipe / 42.5-synchronous pressure, and the minimum integer value is taken to add 2; the liquid ascending speed is equal to 50-60 mm / s; the mold filling pressure =(the heightfrom the liquid surface to the upper end face of the liquid ascending pipe + mold shell cavity highest height (740 mm)) / 42.5-synchronous pressure, and the minimum integer value is taken to add the compensation pressure needed for the casting to consume metal liquid; the mold filling speed is 50-60 mm / s; the crystallization pressure difference is 0.3 MPa, and the crystallization time is 480-520 s.The casting method has the beneficial effects that firstly, differential pressure method pouring is conducted, solidification is conducted under the pressure, the structure of the casting is dense, and separation-out air holes are reduced; and secondly, metal liquid sufficient overheating is conducted, a CuAl2 phase is sufficiently dissolved, the casting metallographic structure is uniform, and the phenomenon of segregation is avoided.
Description
technical field [0001] The invention relates to a casting method of an aluminum alloy casting, in particular to a casting method of a ZL205A aluminum alloy. Background technique [0002] ZL205A aluminum alloy castings are smelted and poured in an atmospheric environment. Because the alloy is in a state of normal pressure when it solidifies, the metal density is poor. At the same time, the original CuAl2 in the original material is not fully dissolved, and the casting structure is uneven, resulting in medium strength of the mechanical properties of the alloy after heat treatment. Indexes and plasticity indexes are not easy to meet the standard requirements, which directly affects product delivery. Contents of the invention [0003] The purpose of the present invention is to provide a casting method for improving the mechanical properties of ZL205A aluminum alloy castings and improve the mechanical properties of ZL205A aluminum alloy castings. [0004] Technical scheme of t...
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IPC IPC(8): B22D18/04C22F1/057
CPCB22D18/04C22F1/002C22F1/057
Inventor 刘俊英李鹏周雷李增乐侯伟
Owner SHAANXI HONGYUAN AVIATION FORGING